*** empty log message ***

1 files changed, 2564 insertions, 2362 deletions

diff --git a/src/libtiff/tif_ojpeg.c b/src/libtiff/tif_ojpeg.c
index 0c876cd..fb6d2a2 100644
--- a/src/libtiff/tif_ojpeg.c
+++ b/src/libtiff/tif_ojpeg.c
@@ -1,2427 +1,2629 @@
-/* $Id: tif_ojpeg.c,v 1.3 2009/12/11 15:17:41 scuri Exp $ */
-
-/* WARNING: The type of JPEG encapsulation defined by the TIFF Version 6.0
-   specification is now totally obsolete and deprecated for new applications and
-   images. This file was was created solely in order to read unconverted images
-   still present on some users' computer systems. It will never be extended
-   to write such files. Writing new-style JPEG compressed TIFFs is implemented
-   in tif_jpeg.c.
-
-   The code is carefully crafted to robustly read all gathered JPEG-in-TIFF
-   testfiles, and anticipate as much as possible all other... But still, it may
-   fail on some. If you encounter problems, please report them on the TIFF
-   mailing list and/or to Joris Van Damme <info@awaresystems.be>.
-
-   Please read the file called "TIFF Technical Note #2" if you need to be
-   convinced this compression scheme is bad and breaks TIFF. That document
-   is linked to from the LibTiff site <http://www.remotesensing.org/libtiff/>
-   and from AWare Systems' TIFF section
-   <http://www.awaresystems.be/imaging/tiff.html>. It is also absorbed
-   in Adobe's specification supplements, marked "draft" up to this day, but
-   supported by the TIFF community.
-
-   This file interfaces with Release 6B of the JPEG Library written by the
-   Independent JPEG Group. Previous versions of this file required a hack inside
-   the LibJpeg library. This version no longer requires that. Remember to
-   remove the hack if you update from the old version.
-
-   Copyright (c) Joris Van Damme <info@awaresystems.be>
-   Copyright (c) AWare Systems <http://www.awaresystems.be/>
-
-   The licence agreement for this file is the same as the rest of the LibTiff
-   library.
-
-   IN NO EVENT SHALL JORIS VAN DAMME OR AWARE SYSTEMS BE LIABLE FOR
-   ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
-   OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-   WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
-   LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-   OF THIS SOFTWARE.
-
-   Joris Van Damme and/or AWare Systems may be available for custom
-   developement. If you like what you see, and need anything similar or related,
-   contact <info@awaresystems.be>.
-*/
-
-/* What is what, and what is not?
-
-   This decoder starts with an input stream, that is essentially the JpegInterchangeFormat
-   stream, if any, followed by the strile data, if any. This stream is read in
-   OJPEGReadByte and related functions.
-
-   It analyzes the start of this stream, until it encounters non-marker data, i.e.
-   compressed image data. Some of the header markers it sees have no actual content,
-   like the SOI marker, and APP/COM markers that really shouldn't even be there. Some
-   other markers do have content, and the valuable bits and pieces of information
-   in these markers are saved, checking all to verify that the stream is more or
-   less within expected bounds. This happens inside the OJPEGReadHeaderInfoSecStreamXxx
-   functions.
-
-   Some OJPEG imagery contains no valid JPEG header markers. This situation is picked
-   up on if we've seen no SOF marker when we're at the start of the compressed image
-   data. In this case, the tables are read from JpegXxxTables tags, and the other
-   bits and pieces of information is initialized to its most basic value. This is
-   implemented in the OJPEGReadHeaderInfoSecTablesXxx functions.
-
-   When this is complete, a good and valid JPEG header can be assembled, and this is
-   passed through to LibJpeg. When that's done, the remainder of the input stream, i.e.
-   the compressed image data, can be passed through unchanged. This is done in
-   OJPEGWriteStream functions.
-
-   LibTiff rightly expects to know the subsampling values before decompression. Just like
-   in new-style JPEG-in-TIFF, though, or even more so, actually, the YCbCrsubsampling
-   tag is notoriously unreliable. To correct these tag values with the ones inside
-   the JPEG stream, the first part of the input stream is pre-scanned in
-   OJPEGSubsamplingCorrect, making no note of any other data, reporting no warnings
-   or errors, up to the point where either these values are read, or it's clear they
-   aren't there. This means that some of the data is read twice, but we feel speed
-   in correcting these values is important enough to warrant this sacrifice. Allthough
-   there is currently no define or other configuration mechanism to disable this behaviour,
-   the actual header scanning is build to robustly respond with error report if it
-   should encounter an uncorrected mismatch of subsampling values. See
-   OJPEGReadHeaderInfoSecStreamSof.
-
-   The restart interval and restart markers are the most tricky part... The restart
-   interval can be specified in a tag. It can also be set inside the input JPEG stream.
-   It can be used inside the input JPEG stream. If reading from strile data, we've
-   consistenly discovered the need to insert restart markers in between the different
-   striles, as is also probably the most likely interpretation of the original TIFF 6.0
-   specification. With all this setting of interval, and actual use of markers that is not
-   predictable at the time of valid JPEG header assembly, the restart thing may turn
-   out the Achilles heel of this implementation. Fortunately, most OJPEG writer vendors
-   succeed in reading back what they write, which may be the reason why we've been able
-   to discover ways that seem to work.
-
-   Some special provision is made for planarconfig separate OJPEG files. These seem
-   to consistently contain header info, a SOS marker, a plane, SOS marker, plane, SOS,
-   and plane. This may or may not be a valid JPEG configuration, we don't know and don't
-   care. We want LibTiff to be able to access the planes individually, without huge
-   buffering inside LibJpeg, anyway. So we compose headers to feed to LibJpeg, in this
-   case, that allow us to pass a single plane such that LibJpeg sees a valid
-   single-channel JPEG stream. Locating subsequent SOS markers, and thus subsequent
-   planes, is done inside OJPEGReadSecondarySos.
-
-   The benefit of the scheme is... that it works, basically. We know of no other that
-   does. It works without checking software tag, or otherwise going about things in an
-   OJPEG flavor specific manner. Instead, it is a single scheme, that covers the cases
-   with and without JpegInterchangeFormat, with and without striles, with part of
-   the header in JpegInterchangeFormat and remainder in first strile, etc. It is forgiving
-   and robust, may likely work with OJPEG flavors we've not seen yet, and makes most out
-   of the data.
-
-   Another nice side-effect is that a complete JPEG single valid stream is build if
-   planarconfig is not separate (vast majority). We may one day use that to build
-   converters to JPEG, and/or to new-style JPEG compression inside TIFF.
-
-   A dissadvantage is the lack of random access to the individual striles. This is the
-   reason for much of the complicated restart-and-position stuff inside OJPEGPreDecode.
-   Applications would do well accessing all striles in order, as this will result in
-   a single sequential scan of the input stream, and no restarting of LibJpeg decoding
-   session.
-*/
-
+/* $Id: tif_ojpeg.c,v 1.4 2010/01/26 15:56:36 scuri Exp $ */
 
 #include "tiffiop.h"
 #ifdef OJPEG_SUPPORT
 
-/* Configuration defines here are:
- * JPEG_ENCAP_EXTERNAL: The normal way to call libjpeg, uses longjump. In some environments,
- * 	like eg LibTiffDelphi, this is not possible. For this reason, the actual calls to
- * 	libjpeg, with longjump stuff, are encapsulated in dedicated functions. When
- * 	JPEG_ENCAP_EXTERNAL is defined, these encapsulating functions are declared external
- * 	to this unit, and can be defined elsewhere to use stuff other then longjump.
- * 	The default mode, without JPEG_ENCAP_EXTERNAL, implements the call encapsulators
- * 	here, internally, with normal longjump.
- * SETJMP, LONGJMP, JMP_BUF: On some machines/environments a longjump equivalent is
- * 	conviniently available, but still it may be worthwhile to use _setjmp or sigsetjmp
- * 	in place of plain setjmp. These macros will make it easier. It is useless
- * 	to fiddle with these if you define JPEG_ENCAP_EXTERNAL.
- * OJPEG_BUFFER: Define the size of the desired buffer here. Should be small enough so as to guarantee
- * 	instant processing, optimal streaming and optimal use of processor cache, but also big
- * 	enough so as to not result in significant call overhead. It should be at least a few
- * 	bytes to accomodate some structures (this is verified in asserts), but it would not be
- * 	sensible to make it this small anyway, and it should be at most 64K since it is indexed
- * 	with uint16. We recommend 2K.
- * EGYPTIANWALK: You could also define EGYPTIANWALK here, but it is not used anywhere and has
- * 	absolutely no effect. That is why most people insist the EGYPTIANWALK is a bit silly.
- */
-
-/* #define LIBJPEG_ENCAP_EXTERNAL */
-#define SETJMP(jbuf) setjmp(jbuf)
-#define LONGJMP(jbuf,code) longjmp(jbuf,code)
-#define JMP_BUF jmp_buf
-#define OJPEG_BUFFER 2048
-/* define EGYPTIANWALK */
-
-#define JPEG_MARKER_SOF0 0xC0
-#define JPEG_MARKER_SOF1 0xC1
-#define JPEG_MARKER_SOF3 0xC3
-#define JPEG_MARKER_DHT 0xC4
-#define JPEG_MARKER_RST0 0XD0
-#define JPEG_MARKER_SOI 0xD8
-#define JPEG_MARKER_EOI 0xD9
-#define JPEG_MARKER_SOS 0xDA
-#define JPEG_MARKER_DQT 0xDB
-#define JPEG_MARKER_DRI 0xDD
-#define JPEG_MARKER_APP0 0xE0
-#define JPEG_MARKER_COM 0xFE
-
-#define FIELD_OJPEG_JPEGINTERCHANGEFORMAT (FIELD_CODEC+0)
-#define FIELD_OJPEG_JPEGINTERCHANGEFORMATLENGTH (FIELD_CODEC+1)
-#define FIELD_OJPEG_JPEGQTABLES (FIELD_CODEC+2)
-#define FIELD_OJPEG_JPEGDCTABLES (FIELD_CODEC+3)
-#define FIELD_OJPEG_JPEGACTABLES (FIELD_CODEC+4)
-#define FIELD_OJPEG_JPEGPROC (FIELD_CODEC+5)
-#define FIELD_OJPEG_JPEGRESTARTINTERVAL (FIELD_CODEC+6)
-#define FIELD_OJPEG_COUNT 7
-
-static const TIFFFieldInfo ojpeg_field_info[] = {
-	{TIFFTAG_JPEGIFOFFSET,1,1,TIFF_LONG,FIELD_OJPEG_JPEGINTERCHANGEFORMAT,TRUE,FALSE,"JpegInterchangeFormat"},
-	{TIFFTAG_JPEGIFBYTECOUNT,1,1,TIFF_LONG,FIELD_OJPEG_JPEGINTERCHANGEFORMATLENGTH,TRUE,FALSE,"JpegInterchangeFormatLength"},
-	{TIFFTAG_JPEGQTABLES,TIFF_VARIABLE,TIFF_VARIABLE,TIFF_LONG,FIELD_OJPEG_JPEGQTABLES,FALSE,TRUE,"JpegQTables"},
-	{TIFFTAG_JPEGDCTABLES,TIFF_VARIABLE,TIFF_VARIABLE,TIFF_LONG,FIELD_OJPEG_JPEGDCTABLES,FALSE,TRUE,"JpegDcTables"},
-	{TIFFTAG_JPEGACTABLES,TIFF_VARIABLE,TIFF_VARIABLE,TIFF_LONG,FIELD_OJPEG_JPEGACTABLES,FALSE,TRUE,"JpegAcTables"},
-	{TIFFTAG_JPEGPROC,1,1,TIFF_SHORT,FIELD_OJPEG_JPEGPROC,FALSE,FALSE,"JpegProc"},
-	{TIFFTAG_JPEGRESTARTINTERVAL,1,1,TIFF_SHORT,FIELD_OJPEG_JPEGRESTARTINTERVAL,FALSE,FALSE,"JpegRestartInterval"},
-};
-
-#ifndef LIBJPEG_ENCAP_EXTERNAL
+/* JPEG Compression support, as per the original TIFF 6.0 specification.
+
+   WARNING: KLUDGE ALERT!  The type of JPEG encapsulation defined by the TIFF
+                           Version 6.0 specification is now totally obsolete and
+   deprecated for new applications and images.  This file is an unsupported hack
+   that was created solely in order to read (but NOT write!) a few old,
+   unconverted images still present on some users' computer systems.  The code
+   isn't pretty or robust, and it won't read every "old format" JPEG-in-TIFF
+   file (see Samuel Leffler's draft "TIFF Technical Note No. 2" for a long and
+   incomplete list of known problems), but it seems to work well enough in the
+   few cases of practical interest to the author; so, "caveat emptor"!  This
+   file should NEVER be enhanced to write new images using anything other than
+   the latest approved JPEG-in-TIFF encapsulation method, implemented by the
+   "tif_jpeg.c" file elsewhere in this library.
+
+   This file interfaces with Release 6B of the JPEG Library written by theu
+   Independent JPEG Group, which you can find on the Internet at:
+   ftp://ftp.uu.net:/graphics/jpeg/.
+
+   The "C" Preprocessor macros, "[CD]_LOSSLESS_SUPPORTED", are defined by your
+   JPEG Library Version 6B only if you have applied a (massive!) patch by Ken
+   Murchison of Oceana Matrix Ltd. <ken@oceana.com> to support lossless Huffman
+   encoding (TIFF "JPEGProc" tag value = 14).  This patch can be found on the
+   Internet at: ftp://ftp.oceana.com/pub/ljpeg-6b.tar.gz.
+
+   Some old files produced by the Wang Imaging application for Microsoft Windows
+   apparently can be decoded only with a special patch to the JPEG Library,
+   which defines a subroutine named "jpeg_reset_huff_decode()" in its "jdhuff.c"
+   module (the "jdshuff.c" module, if Ken Murchison's patch has been applied).
+   Unfortunately the patch differs slightly in each case, and some TIFF Library
+   have reported problems finding the code, so both versions appear below; you
+   should carefully extract and apply only the version that applies to your JPEG
+   Library!
+
+   Contributed by Scott Marovich <marovich@hpl.hp.com> with considerable help
+   from Charles Auer <Bumble731@msn.com> to unravel the mysteries of image files
+   created by the Wang Imaging application for Microsoft Windows.
+*/
+#if 0  /* Patch for JPEG Library WITHOUT lossless Huffman coding */
+*** jdhuff.c.orig	Mon Oct 20 17:51:10 1997
+--- jdhuff.c	Sun Nov 11 17:33:58 2001
+***************
+*** 648,651 ****
+--- 648,683 ----
+    for (i = 0; i < NUM_HUFF_TBLS; i++) {
+      entropy->dc_derived_tbls[i] = entropy->ac_derived_tbls[i] = NULL;
+    }
+  }
++ 
++ /*
++  * BEWARE OF KLUDGE:  This subroutine is a hack for decoding illegal JPEG-in-
++  *                    TIFF encapsulations produced by Microsoft's Wang Imaging
++  * for Windows application with the public-domain TIFF Library.  Based upon an
++  * examination of selected output files, this program apparently divides a JPEG
++  * bit-stream into consecutive horizontal TIFF "strips", such that the JPEG
++  * encoder's/decoder's DC coefficients for each image component are reset before
++  * each "strip".  Moreover, a "strip" is not necessarily encoded in a multiple
++  * of 8 bits, so one must sometimes discard 1-7 bits at the end of each "strip"
++  * for alignment to the next input-Byte storage boundary.  IJG JPEG Library
++  * decoder state is not normally exposed to client applications, so this sub-
++  * routine provides the TIFF Library with a "hook" to make these corrections.
++  * It should be called after "jpeg_start_decompress()" and before
++  * "jpeg_finish_decompress()", just before decoding each "strip" using
++  * "jpeg_read_raw_data()" or "jpeg_read_scanlines()".
++  *
++  * This kludge is not sanctioned or supported by the Independent JPEG Group, and
++  * future changes to the IJG JPEG Library might invalidate it.  Do not send bug
++  * reports about this code to IJG developers.  Instead, contact the author for
++  * advice: Scott B. Marovich <marovich@hpl.hp.com>, Hewlett-Packard Labs, 6/01.
++  */
++ GLOBAL(void)
++ jpeg_reset_huff_decode (register j_decompress_ptr cinfo)
++ { register huff_entropy_ptr entropy = (huff_entropy_ptr)cinfo->entropy;
++   register int ci = 0;
++ 
++   /* Discard encoded input bits, up to the next Byte boundary */
++   entropy->bitstate.bits_left &= ~7;
++   /* Re-initialize DC predictions to 0 */
++   do entropy->saved.last_dc_val[ci] = 0; while (++ci < cinfo->comps_in_scan);
++ }
+#endif /* Patch for JPEG Library WITHOUT lossless Huffman coding */
+#if 0  /* Patch for JPEG Library WITH lossless Huffman coding */
+*** jdshuff.c.orig	Mon Mar 11 16:44:54 2002
+--- jdshuff.c	Mon Mar 11 16:44:54 2002
+***************
+*** 357,360 ****
+--- 357,393 ----
+    for (i = 0; i < NUM_HUFF_TBLS; i++) {
+      entropy->dc_derived_tbls[i] = entropy->ac_derived_tbls[i] = NULL;
+    }
+  }
++ 
++ /*
++  * BEWARE OF KLUDGE:  This subroutine is a hack for decoding illegal JPEG-in-
++  *                    TIFF encapsulations produced by Microsoft's Wang Imaging
++  * for Windows application with the public-domain TIFF Library.  Based upon an
++  * examination of selected output files, this program apparently divides a JPEG
++  * bit-stream into consecutive horizontal TIFF "strips", such that the JPEG
++  * encoder's/decoder's DC coefficients for each image component are reset before
++  * each "strip".  Moreover, a "strip" is not necessarily encoded in a multiple
++  * of 8 bits, so one must sometimes discard 1-7 bits at the end of each "strip"
++  * for alignment to the next input-Byte storage boundary.  IJG JPEG Library
++  * decoder state is not normally exposed to client applications, so this sub-
++  * routine provides the TIFF Library with a "hook" to make these corrections.
++  * It should be called after "jpeg_start_decompress()" and before
++  * "jpeg_finish_decompress()", just before decoding each "strip" using
++  * "jpeg_read_raw_data()" or "jpeg_read_scanlines()".
++  *
++  * This kludge is not sanctioned or supported by the Independent JPEG Group, and
++  * future changes to the IJG JPEG Library might invalidate it.  Do not send bug
++  * reports about this code to IJG developers.  Instead, contact the author for
++  * advice: Scott B. Marovich <marovich@hpl.hp.com>, Hewlett-Packard Labs, 6/01.
++  */
++ GLOBAL(void)
++ jpeg_reset_huff_decode (register j_decompress_ptr cinfo)
++ { register shuff_entropy_ptr entropy = (shuff_entropy_ptr)
++                                        ((j_lossy_d_ptr)cinfo->codec)->entropy_private;
++   register int ci = 0;
++ 
++   /* Discard encoded input bits, up to the next Byte boundary */
++   entropy->bitstate.bits_left &= ~7;
++   /* Re-initialize DC predictions to 0 */
++   do entropy->saved.last_dc_val[ci] = 0; while (++ci < cinfo->comps_in_scan);
++ }
+#endif /* Patch for JPEG Library WITH lossless Huffman coding */
 #include <setjmp.h>
+#include <stdio.h>
+#ifdef FAR
+#undef FAR /* Undefine FAR to avoid conflict with JPEG definition */
 #endif
-
+#define JPEG_INTERNALS /* Include "jpegint.h" for "DSTATE_*" symbols */
+#define JPEG_CJPEG_DJPEG /* Include all Version 6B+ "jconfig.h" options */
+#undef INLINE
 #include "jpeglib.h"
-#include "jerror.h"
-
-typedef struct jpeg_error_mgr jpeg_error_mgr;
-typedef struct jpeg_common_struct jpeg_common_struct;
-typedef struct jpeg_decompress_struct jpeg_decompress_struct;
-typedef struct jpeg_source_mgr jpeg_source_mgr;
+#undef JPEG_CJPEG_DJPEG
+#undef JPEG_INTERNALS
 
-typedef enum {
-	osibsNotSetYet,
-	osibsJpegInterchangeFormat,
-	osibsStrile,
-	osibsEof
-} OJPEGStateInBufferSource;
-
-typedef enum {
-	ososSoi,
-	ososQTable0,ososQTable1,ososQTable2,ososQTable3,
-	ososDcTable0,ososDcTable1,ososDcTable2,ososDcTable3,
-	ososAcTable0,ososAcTable1,ososAcTable2,ososAcTable3,
-	ososDri,
-	ososSof,
-	ososSos,
-	ososCompressed,
-	ososRst,
-	ososEoi
-} OJPEGStateOutState;
-
-typedef struct {
-	TIFF* tif;
-	#ifndef LIBJPEG_ENCAP_EXTERNAL
-	JMP_BUF exit_jmpbuf;
-	#endif
-	TIFFVGetMethod vgetparent;
-	TIFFVSetMethod vsetparent;
-	toff_t file_size;
-	uint32 image_width;
-	uint32 image_length;
-	uint32 strile_width;
-	uint32 strile_length;
-	uint32 strile_length_total;
-	uint8 samples_per_pixel;
-	uint8 plane_sample_offset;
-	uint8 samples_per_pixel_per_plane;
-	toff_t jpeg_interchange_format;
-	toff_t jpeg_interchange_format_length;
-	uint8 jpeg_proc;
-	uint8 subsamplingcorrect;
-	uint8 subsamplingcorrect_done;
-	uint8 subsampling_tag;
-	uint8 subsampling_hor;
-	uint8 subsampling_ver;
-	uint8 subsampling_force_desubsampling_inside_decompression;
-	uint8 qtable_offset_count;
-	uint8 dctable_offset_count;
-	uint8 actable_offset_count;
-	toff_t qtable_offset[3];
-	toff_t dctable_offset[3];
-	toff_t actable_offset[3];
-	uint8* qtable[4];
-	uint8* dctable[4];
-	uint8* actable[4];
-	uint16 restart_interval;
-	uint8 restart_index;
-	uint8 sof_log;
-	uint8 sof_marker_id;
-	uint32 sof_x;
-	uint32 sof_y;
-	uint8 sof_c[3];
-	uint8 sof_hv[3];
-	uint8 sof_tq[3];
-	uint8 sos_cs[3];
-	uint8 sos_tda[3];
-	struct {
-		uint8 log;
-		OJPEGStateInBufferSource in_buffer_source;
-		tstrile_t in_buffer_next_strile;
-		toff_t in_buffer_file_pos;
-		toff_t in_buffer_file_togo;
-	} sos_end[3];
-	uint8 readheader_done;
-	uint8 writeheader_done;
-	tsample_t write_cursample;
-	tstrile_t write_curstrile;
-	uint8 libjpeg_session_active;
-	uint8 libjpeg_jpeg_query_style;
-	jpeg_error_mgr libjpeg_jpeg_error_mgr;
-	jpeg_decompress_struct libjpeg_jpeg_decompress_struct;
-	jpeg_source_mgr libjpeg_jpeg_source_mgr;
-	uint8 subsampling_convert_log;
-	uint32 subsampling_convert_ylinelen;
-	uint32 subsampling_convert_ylines;
-	uint32 subsampling_convert_clinelen;
-	uint32 subsampling_convert_clines;
-	uint32 subsampling_convert_ybuflen;
-	uint32 subsampling_convert_cbuflen;
-	uint32 subsampling_convert_ycbcrbuflen;
-	uint8* subsampling_convert_ycbcrbuf;
-	uint8* subsampling_convert_ybuf;
-	uint8* subsampling_convert_cbbuf;
-	uint8* subsampling_convert_crbuf;
-	uint32 subsampling_convert_ycbcrimagelen;
-	uint8** subsampling_convert_ycbcrimage;
-	uint32 subsampling_convert_clinelenout;
-	uint32 subsampling_convert_state;
-	uint32 bytes_per_line;   /* if the codec outputs subsampled data, a 'line' in bytes_per_line */
-	uint32 lines_per_strile; /* and lines_per_strile means subsampling_ver desubsampled rows     */
-	OJPEGStateInBufferSource in_buffer_source;
-	tstrile_t in_buffer_next_strile;
-	tstrile_t in_buffer_strile_count;
-	toff_t in_buffer_file_pos;
-	uint8 in_buffer_file_pos_log;
-	toff_t in_buffer_file_togo;
-	uint16 in_buffer_togo;
-	uint8* in_buffer_cur;
-	uint8 in_buffer[OJPEG_BUFFER];
-	OJPEGStateOutState out_state;
-	uint8 out_buffer[OJPEG_BUFFER];
-	uint8* skip_buffer;
-} OJPEGState;
-
-static int OJPEGVGetField(TIFF* tif, ttag_t tag, va_list ap);
-static int OJPEGVSetField(TIFF* tif, ttag_t tag, va_list ap);
-static void OJPEGPrintDir(TIFF* tif, FILE* fd, long flags);
-
-static int OJPEGSetupDecode(TIFF* tif);
-static int OJPEGPreDecode(TIFF* tif, tsample_t s);
-static int OJPEGPreDecodeSkipRaw(TIFF* tif);
-static int OJPEGPreDecodeSkipScanlines(TIFF* tif);
-static int OJPEGDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s);
-static int OJPEGDecodeRaw(TIFF* tif, tidata_t buf, tsize_t cc);
-static int OJPEGDecodeScanlines(TIFF* tif, tidata_t buf, tsize_t cc);
-static void OJPEGPostDecode(TIFF* tif, tidata_t buf, tsize_t cc);
-static int OJPEGSetupEncode(TIFF* tif);
-static int OJPEGPreEncode(TIFF* tif, tsample_t s);
-static int OJPEGEncode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s);
-static int OJPEGPostEncode(TIFF* tif);
-static void OJPEGCleanup(TIFF* tif);
-
-static void OJPEGSubsamplingCorrect(TIFF* tif);
-static int OJPEGReadHeaderInfo(TIFF* tif);
-static int OJPEGReadSecondarySos(TIFF* tif, tsample_t s);
-static int OJPEGWriteHeaderInfo(TIFF* tif);
-static void OJPEGLibjpegSessionAbort(TIFF* tif);
-
-static int OJPEGReadHeaderInfoSec(TIFF* tif);
-static int OJPEGReadHeaderInfoSecStreamDri(TIFF* tif);
-static int OJPEGReadHeaderInfoSecStreamDqt(TIFF* tif);
-static int OJPEGReadHeaderInfoSecStreamDht(TIFF* tif);
-static int OJPEGReadHeaderInfoSecStreamSof(TIFF* tif, uint8 marker_id);
-static int OJPEGReadHeaderInfoSecStreamSos(TIFF* tif);
-static int OJPEGReadHeaderInfoSecTablesQTable(TIFF* tif);
-static int OJPEGReadHeaderInfoSecTablesDcTable(TIFF* tif);
-static int OJPEGReadHeaderInfoSecTablesAcTable(TIFF* tif);
-
-static int OJPEGReadBufferFill(OJPEGState* sp);
-static int OJPEGReadByte(OJPEGState* sp, uint8* byte);
-static int OJPEGReadBytePeek(OJPEGState* sp, uint8* byte);
-static void OJPEGReadByteAdvance(OJPEGState* sp);
-static int OJPEGReadWord(OJPEGState* sp, uint16* word);
-static int OJPEGReadBlock(OJPEGState* sp, uint16 len, void* mem);
-static void OJPEGReadSkip(OJPEGState* sp, uint16 len);
-
-static int OJPEGWriteStream(TIFF* tif, void** mem, uint32* len);
-static void OJPEGWriteStreamSoi(TIFF* tif, void** mem, uint32* len);
-static void OJPEGWriteStreamQTable(TIFF* tif, uint8 table_index, void** mem, uint32* len);
-static void OJPEGWriteStreamDcTable(TIFF* tif, uint8 table_index, void** mem, uint32* len);
-static void OJPEGWriteStreamAcTable(TIFF* tif, uint8 table_index, void** mem, uint32* len);
-static void OJPEGWriteStreamDri(TIFF* tif, void** mem, uint32* len);
-static void OJPEGWriteStreamSof(TIFF* tif, void** mem, uint32* len);
-static void OJPEGWriteStreamSos(TIFF* tif, void** mem, uint32* len);
-static int OJPEGWriteStreamCompressed(TIFF* tif, void** mem, uint32* len);
-static void OJPEGWriteStreamRst(TIFF* tif, void** mem, uint32* len);
-static void OJPEGWriteStreamEoi(TIFF* tif, void** mem, uint32* len);
-
-#ifdef LIBJPEG_ENCAP_EXTERNAL
-extern int jpeg_create_decompress_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo);
-extern int jpeg_read_header_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo, uint8 require_image);
-extern int jpeg_start_decompress_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo);
-extern int jpeg_read_scanlines_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo, void* scanlines, uint32 max_lines);
-extern int jpeg_read_raw_data_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo, void* data, uint32 max_lines);
-extern void jpeg_encap_unwind(TIFF* tif);
-#else
-static int jpeg_create_decompress_encap(OJPEGState* sp, jpeg_decompress_struct* j);
-static int jpeg_read_header_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo, uint8 require_image);
-static int jpeg_start_decompress_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo);
-static int jpeg_read_scanlines_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo, void* scanlines, uint32 max_lines);
-static int jpeg_read_raw_data_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo, void* data, uint32 max_lines);
-static void jpeg_encap_unwind(TIFF* tif);
-#endif
+/* Hack for files produced by Wang Imaging application on Microsoft Windows */
+extern void jpeg_reset_huff_decode(j_decompress_ptr);
 
-static void OJPEGLibjpegJpegErrorMgrOutputMessage(jpeg_common_struct* cinfo);
-static void OJPEGLibjpegJpegErrorMgrErrorExit(jpeg_common_struct* cinfo);
-static void OJPEGLibjpegJpegSourceMgrInitSource(jpeg_decompress_struct* cinfo);
-static boolean OJPEGLibjpegJpegSourceMgrFillInputBuffer(jpeg_decompress_struct* cinfo);
-static void OJPEGLibjpegJpegSourceMgrSkipInputData(jpeg_decompress_struct* cinfo, long num_bytes);
-static boolean OJPEGLibjpegJpegSourceMgrResyncToRestart(jpeg_decompress_struct* cinfo, int desired);
-static void OJPEGLibjpegJpegSourceMgrTermSource(jpeg_decompress_struct* cinfo);
+/* On some machines, it may be worthwhile to use "_setjmp()" or "sigsetjmp()"
+   instead of "setjmp()".  These macros make it easier:
+*/
+#define SETJMP(jbuf)setjmp(jbuf)
+#define LONGJMP(jbuf,code)longjmp(jbuf,code)
+#define JMP_BUF jmp_buf
 
-int
-TIFFInitOJPEG(TIFF* tif, int scheme)
-{
-	static const char module[]="TIFFInitOJPEG";
-	OJPEGState* sp;
-
-	assert(scheme==COMPRESSION_OJPEG);
-
-        /*
-	 * Merge codec-specific tag information.
-	 */
-	if (!_TIFFMergeFieldInfo(tif,ojpeg_field_info,FIELD_OJPEG_COUNT)) {
-		TIFFErrorExt(tif->tif_clientdata, module,
-			     "Merging Old JPEG codec-specific tags failed");
-		return 0;
-	}
+#define TIFFTAG_WANG_PAGECONTROL 32934
 
-	/* state block */
-	sp=_TIFFmalloc(sizeof(OJPEGState));
-	if (sp==NULL)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"No space for OJPEG state block");
-		return(0);
-	}
-	_TIFFmemset(sp,0,sizeof(OJPEGState));
-	sp->tif=tif;
-	sp->jpeg_proc=1;
-	sp->subsampling_hor=2;
-	sp->subsampling_ver=2;
-	TIFFSetField(tif,TIFFTAG_YCBCRSUBSAMPLING,2,2);
-	/* tif codec methods */
-	tif->tif_setupdecode=OJPEGSetupDecode;
-	tif->tif_predecode=OJPEGPreDecode;
-	tif->tif_postdecode=OJPEGPostDecode;
-	tif->tif_decoderow=OJPEGDecode;
-	tif->tif_decodestrip=OJPEGDecode;
-	tif->tif_decodetile=OJPEGDecode;
-	tif->tif_setupencode=OJPEGSetupEncode;
-	tif->tif_preencode=OJPEGPreEncode;
-	tif->tif_postencode=OJPEGPostEncode;
-	tif->tif_encoderow=OJPEGEncode;
-	tif->tif_encodestrip=OJPEGEncode;
-	tif->tif_encodetile=OJPEGEncode;
-	tif->tif_cleanup=OJPEGCleanup;
-	tif->tif_data=(tidata_t)sp;
-	/* tif tag methods */
-	sp->vgetparent=tif->tif_tagmethods.vgetfield;
-	tif->tif_tagmethods.vgetfield=OJPEGVGetField;
-	sp->vsetparent=tif->tif_tagmethods.vsetfield;
-	tif->tif_tagmethods.vsetfield=OJPEGVSetField;
-	tif->tif_tagmethods.printdir=OJPEGPrintDir;
-	/* Some OJPEG files don't have strip or tile offsets or bytecounts tags.
-	   Some others do, but have totally meaningless or corrupt values
-	   in these tags. In these cases, the JpegInterchangeFormat stream is
-	   reliable. In any case, this decoder reads the compressed data itself,
-	   from the most reliable locations, and we need to notify encapsulating
-	   LibTiff not to read raw strips or tiles for us. */
-	tif->tif_flags|=TIFF_NOREADRAW;
-	return(1);
-}
+/* Bit-vector offsets for keeping track of TIFF records that we've parsed. */
 
-static int
-OJPEGVGetField(TIFF* tif, ttag_t tag, va_list ap)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	switch(tag)
-	{
-		case TIFFTAG_JPEGIFOFFSET:
-			*va_arg(ap,uint32*)=(uint32)sp->jpeg_interchange_format;
-			break;
-		case TIFFTAG_JPEGIFBYTECOUNT:
-			*va_arg(ap,uint32*)=(uint32)sp->jpeg_interchange_format_length;
-			break;
-		case TIFFTAG_YCBCRSUBSAMPLING:
-			if (sp->subsamplingcorrect_done==0)
-				OJPEGSubsamplingCorrect(tif);
-			*va_arg(ap,uint16*)=(uint16)sp->subsampling_hor;
-			*va_arg(ap,uint16*)=(uint16)sp->subsampling_ver;
-			break;
-		case TIFFTAG_JPEGQTABLES:
-			*va_arg(ap,uint32*)=(uint32)sp->qtable_offset_count;
-			*va_arg(ap,void**)=(void*)sp->qtable_offset;
-			break;
-		case TIFFTAG_JPEGDCTABLES:
-			*va_arg(ap,uint32*)=(uint32)sp->dctable_offset_count;
-			*va_arg(ap,void**)=(void*)sp->dctable_offset;
-			break;
-		case TIFFTAG_JPEGACTABLES:
-			*va_arg(ap,uint32*)=(uint32)sp->actable_offset_count;
-			*va_arg(ap,void**)=(void*)sp->actable_offset;
-			break;
-		case TIFFTAG_JPEGPROC:
-			*va_arg(ap,uint16*)=(uint16)sp->jpeg_proc;
-			break;
-		case TIFFTAG_JPEGRESTARTINTERVAL:
-			*va_arg(ap,uint16*)=sp->restart_interval;
-			break;
-		default:
-			return (*sp->vgetparent)(tif,tag,ap);
-	}
-	return (1);
-}
+#define FIELD_JPEGPROC FIELD_CODEC
+#define FIELD_JPEGIFOFFSET (FIELD_CODEC+1)
+#define FIELD_JPEGIFBYTECOUNT (FIELD_CODEC+2)
+#define FIELD_JPEGRESTARTINTERVAL (FIELD_CODEC+3)
+#define FIELD_JPEGTABLES (FIELD_CODEC+4) /* New, post-6.0 JPEG-in-TIFF tag! */
+#define FIELD_JPEGLOSSLESSPREDICTORS (FIELD_CODEC+5)
+#define FIELD_JPEGPOINTTRANSFORM (FIELD_CODEC+6)
+#define FIELD_JPEGQTABLES (FIELD_CODEC+7)
+#define FIELD_JPEGDCTABLES (FIELD_CODEC+8)
+#define FIELD_JPEGACTABLES (FIELD_CODEC+9)
+#define FIELD_WANG_PAGECONTROL (FIELD_CODEC+10)
+#define FIELD_JPEGCOLORMODE (FIELD_CODEC+11)
 
-static int
-OJPEGVSetField(TIFF* tif, ttag_t tag, va_list ap)
-{
-	static const char module[]="OJPEGVSetField";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint32 ma;
-	uint32* mb;
-	uint32 n;
-	switch(tag)
-	{
-		case TIFFTAG_JPEGIFOFFSET:
-			sp->jpeg_interchange_format=(toff_t)va_arg(ap,uint32);  
-			break;
-		case TIFFTAG_JPEGIFBYTECOUNT:
-			sp->jpeg_interchange_format_length=(toff_t)va_arg(ap,uint32);  
-			break;
-		case TIFFTAG_YCBCRSUBSAMPLING:
-			sp->subsampling_tag=1;
-			sp->subsampling_hor=(uint8)va_arg(ap,int);
-			sp->subsampling_ver=(uint8)va_arg(ap,int);
-			tif->tif_dir.td_ycbcrsubsampling[0]=sp->subsampling_hor;
-			tif->tif_dir.td_ycbcrsubsampling[1]=sp->subsampling_ver;
-			break;
-		case TIFFTAG_JPEGQTABLES:
-			ma=va_arg(ap,uint32);
-			if (ma!=0)
-			{
-				if (ma>3)
-				{
-					TIFFErrorExt(tif->tif_clientdata,module,"JpegQTables tag has incorrect count");
-					return(0);
-				}
-				sp->qtable_offset_count=(uint8)ma;
-				mb=va_arg(ap,uint32*);
-				for (n=0; n<ma; n++)
-					sp->qtable_offset[n]=(toff_t)mb[n];
-			}
-			break;
-		case TIFFTAG_JPEGDCTABLES:
-			ma=va_arg(ap,uint32);
-			if (ma!=0)
-			{
-				if (ma>3)
-				{
-					TIFFErrorExt(tif->tif_clientdata,module,"JpegDcTables tag has incorrect count");
-					return(0);
-				}
-				sp->dctable_offset_count=(uint8)ma;
-				mb=va_arg(ap,uint32*);
-				for (n=0; n<ma; n++)
-					sp->dctable_offset[n]=(toff_t)mb[n];
-			}
-			break;
-		case TIFFTAG_JPEGACTABLES:
-			ma=va_arg(ap,uint32);
-			if (ma!=0)
-			{
-				if (ma>3)
-				{
-					TIFFErrorExt(tif->tif_clientdata,module,"JpegAcTables tag has incorrect count");
-					return(0);
-				}
-				sp->actable_offset_count=(uint8)ma;
-				mb=va_arg(ap,uint32*);
-				for (n=0; n<ma; n++)
-					sp->actable_offset[n]=(toff_t)mb[n];
-			}
-			break;
-		case TIFFTAG_JPEGPROC:
-			sp->jpeg_proc=(uint8)va_arg(ap,uint32);
-			break;
-		case TIFFTAG_JPEGRESTARTINTERVAL:
-			sp->restart_interval=(uint16)va_arg(ap,uint32);
-			break;
-		default:
-			return (*sp->vsetparent)(tif,tag,ap);
-	}
-	TIFFSetFieldBit(tif,_TIFFFieldWithTag(tif,tag)->field_bit);
-	tif->tif_flags|=TIFF_DIRTYDIRECT;
-	return(1);
-}
+typedef struct jpeg_destination_mgr jpeg_destination_mgr;
+typedef struct jpeg_source_mgr jpeg_source_mgr;
+typedef struct jpeg_error_mgr jpeg_error_mgr;
 
+/* State variable for each open TIFF file that uses "libjpeg" for JPEG
+   decompression.  (Note:  This file should NEVER perform JPEG compression
+   except in the manner implemented by the "tif_jpeg.c" file, elsewhere in this
+   library; see comments above.)  JPEG Library internal state is recorded in a
+   "jpeg_{de}compress_struct", while a "jpeg_common_struct" records a few items
+   common to both compression and expansion.  The "cinfo" field containing JPEG
+   Library state MUST be the 1st member of our own state variable, so that we
+   can safely "cast" pointers back and forth.
+*/
+typedef struct             /* This module's private, per-image state variable */
+  {
+    union         /* JPEG Library state variable; this MUST be our 1st field! */
+      {
+        struct jpeg_compress_struct c;
+        struct jpeg_decompress_struct d;
+        struct jpeg_common_struct comm;
+      } cinfo;
+    jpeg_error_mgr err;                         /* JPEG Library error manager */
+    JMP_BUF exit_jmpbuf;             /* ...for catching JPEG Library failures */
+#   ifdef never
+
+ /* (The following two fields could be a "union", but they're small enough that
+    it's not worth the effort.)
+ */
+    jpeg_destination_mgr dest;             /* Destination for compressed data */
+#   endif
+    jpeg_source_mgr src;                           /* Source of expanded data */
+    JSAMPARRAY ds_buffer[MAX_COMPONENTS]; /* ->Temporary downsampling buffers */
+    TIFF *tif;                        /* Reverse pointer, needed by some code */
+    TIFFVGetMethod vgetparent;                    /* "Super class" methods... */
+    TIFFVSetMethod vsetparent;
+    TIFFStripMethod defsparent;
+    TIFFTileMethod deftparent;
+    void *jpegtables;           /* ->"New" JPEG tables, if we synthesized any */
+    uint32 is_WANG,    /* <=> Wang Imaging for Microsoft Windows output file? */
+           jpegtables_length;   /* Length of "new" JPEG tables, if they exist */
+    tsize_t bytesperline;          /* No. of decompressed Bytes per scan line */
+    int jpegquality,                             /* Compression quality level */
+        jpegtablesmode,                          /* What to put in JPEGTables */
+        samplesperclump,
+        scancount;                           /* No. of scan lines accumulated */
+    J_COLOR_SPACE photometric;          /* IJG JPEG Library's photometry code */
+    unsigned char h_sampling,                          /* Luminance sampling factors */
+           v_sampling,
+           jpegcolormode;           /* Who performs RGB <-> YCbCr conversion? */
+			/* JPEGCOLORMODE_RAW <=> TIFF Library or its client */
+			/* JPEGCOLORMODE_RGB <=> JPEG Library               */
+    /* These fields are added to support TIFFGetField */
+    uint16 jpegproc;
+    uint32 jpegifoffset;
+    uint32 jpegifbytecount;
+    uint32 jpegrestartinterval;
+    void* jpeglosslesspredictors;
+    uint16 jpeglosslesspredictors_length;
+    void* jpegpointtransform;
+    uint32 jpegpointtransform_length;
+    void* jpegqtables;
+    uint32 jpegqtables_length;
+    void* jpegdctables;
+    uint32 jpegdctables_length;
+    void* jpegactables;
+    uint32 jpegactables_length;
+
+  } OJPEGState;
+#define OJState(tif)((OJPEGState*)(tif)->tif_data)
+
+static const TIFFFieldInfo ojpegFieldInfo[]=/* JPEG-specific TIFF-record tags */
+  {
+
+ /* This is the current JPEG-in-TIFF metadata-encapsulation tag, and its
+    treatment in this file is idiosyncratic.  It should never appear in a
+    "source" image conforming to the TIFF Version 6.0 specification, so we
+    arrange to report an error if it appears.  But in order to support possible
+    future conversion of "old" JPEG-in-TIFF encapsulations to "new" ones, we
+    might wish to synthesize an equivalent value to be returned by the TIFF
+    Library's "getfield" method.  So, this table tells the TIFF Library to pass
+    these records to us in order to filter them below.
+ */
+    {
+      TIFFTAG_JPEGTABLES            ,TIFF_VARIABLE2,TIFF_VARIABLE2,
+      TIFF_UNDEFINED,FIELD_JPEGTABLES            ,FALSE,TRUE ,"JPEGTables"
+    },
+
+ /* These tags are defined by the TIFF Version 6.0 specification and are now
+    obsolete.  This module reads them from an old "source" image, but it never
+    writes them to a new "destination" image.
+ */
+    {
+      TIFFTAG_JPEGPROC              ,1            ,1            ,
+      TIFF_SHORT    ,FIELD_JPEGPROC              ,FALSE,FALSE,"JPEGProc"
+    },
+    {
+      TIFFTAG_JPEGIFOFFSET          ,1            ,1            ,
+      TIFF_LONG     ,FIELD_JPEGIFOFFSET          ,FALSE,FALSE,"JPEGInterchangeFormat"
+    },
+    {
+      TIFFTAG_JPEGIFBYTECOUNT       ,1            ,1            ,
+      TIFF_LONG     ,FIELD_JPEGIFBYTECOUNT       ,FALSE,FALSE,"JPEGInterchangeFormatLength"
+    },
+    {
+      TIFFTAG_JPEGRESTARTINTERVAL   ,1            ,1            ,
+      TIFF_SHORT    ,FIELD_JPEGRESTARTINTERVAL   ,FALSE,FALSE,"JPEGRestartInterval"
+    },
+    {
+      TIFFTAG_JPEGLOSSLESSPREDICTORS,TIFF_VARIABLE,TIFF_VARIABLE,
+      TIFF_SHORT    ,FIELD_JPEGLOSSLESSPREDICTORS,FALSE,TRUE ,"JPEGLosslessPredictors"
+    },
+    {
+      TIFFTAG_JPEGPOINTTRANSFORM    ,TIFF_VARIABLE,TIFF_VARIABLE,
+      TIFF_SHORT    ,FIELD_JPEGPOINTTRANSFORM    ,FALSE,TRUE ,"JPEGPointTransforms"
+    },
+    {
+      TIFFTAG_JPEGQTABLES           ,TIFF_VARIABLE,TIFF_VARIABLE,
+      TIFF_LONG     ,FIELD_JPEGQTABLES           ,FALSE,TRUE ,"JPEGQTables"
+    },
+    {
+      TIFFTAG_JPEGDCTABLES          ,TIFF_VARIABLE,TIFF_VARIABLE,
+      TIFF_LONG     ,FIELD_JPEGDCTABLES          ,FALSE,TRUE ,"JPEGDCTables"
+    },
+    {
+      TIFFTAG_JPEGACTABLES          ,TIFF_VARIABLE,TIFF_VARIABLE,
+      TIFF_LONG     ,FIELD_JPEGACTABLES          ,FALSE,TRUE ,"JPEGACTables"
+    },
+    {
+      TIFFTAG_WANG_PAGECONTROL      ,TIFF_VARIABLE,1            ,
+      TIFF_LONG     ,FIELD_WANG_PAGECONTROL      ,FALSE,FALSE,"WANG PageControl"
+    },
+
+ /* This is a pseudo tag intended for internal use only by the TIFF Library and
+    its clients, which should never appear in an input/output image file.  It
+    specifies whether the TIFF Library (or its client) should do YCbCr <-> RGB
+    color-space conversion (JPEGCOLORMODE_RAW <=> 0) or whether we should ask
+    the JPEG Library to do it (JPEGCOLORMODE_RGB <=> 1).
+ */
+    {
+      TIFFTAG_JPEGCOLORMODE         ,0            ,0            ,
+      TIFF_ANY      ,FIELD_PSEUDO                ,FALSE,FALSE,"JPEGColorMode"
+    }
+  };
+static const char JPEGLib_name[]={"JPEG Library"},
+                  bad_bps[]={"%u BitsPerSample not allowed for JPEG"},
+                  bad_photometry[]={"PhotometricInterpretation %u not allowed for JPEG"},
+                  bad_subsampling[]={"invalid YCbCr subsampling factor(s)"},
+#                 ifdef never
+                  no_write_frac[]={"fractional scan line discarded"},
+#                 endif
+                  no_read_frac[]={"fractional scan line not read"},
+                  no_jtable_space[]={"No space for JPEGTables"};
+
+/* The following diagnostic subroutines interface with and replace default
+   subroutines in the JPEG Library.  Our basic strategy is to use "setjmp()"/
+   "longjmp()" in order to return control to the TIFF Library when the JPEG
+   library detects an error, and to use TIFF Library subroutines for displaying
+   diagnostic messages to a client application.
+*/
 static void
-OJPEGPrintDir(TIFF* tif, FILE* fd, long flags)
+TIFFojpeg_error_exit(register j_common_ptr cinfo)
 {
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8 m;
-	(void)flags;
-	assert(sp!=NULL);
-	if (TIFFFieldSet(tif,FIELD_OJPEG_JPEGINTERCHANGEFORMAT))
-		fprintf(fd,"  JpegInterchangeFormat: %lu\n",(unsigned long)sp->jpeg_interchange_format);
-	if (TIFFFieldSet(tif,FIELD_OJPEG_JPEGINTERCHANGEFORMATLENGTH))
-		fprintf(fd,"  JpegInterchangeFormatLength: %lu\n",(unsigned long)sp->jpeg_interchange_format_length);
-	if (TIFFFieldSet(tif,FIELD_OJPEG_JPEGQTABLES))
-	{
-		fprintf(fd,"  JpegQTables:");
-		for (m=0; m<sp->qtable_offset_count; m++)
-			fprintf(fd," %lu",(unsigned long)sp->qtable_offset[m]);
-		fprintf(fd,"\n");
-	}
-	if (TIFFFieldSet(tif,FIELD_OJPEG_JPEGDCTABLES))
-	{
-		fprintf(fd,"  JpegDcTables:");
-		for (m=0; m<sp->dctable_offset_count; m++)
-			fprintf(fd," %lu",(unsigned long)sp->dctable_offset[m]);
-		fprintf(fd,"\n");
-	}
-	if (TIFFFieldSet(tif,FIELD_OJPEG_JPEGACTABLES))
-	{
-		fprintf(fd,"  JpegAcTables:");
-		for (m=0; m<sp->actable_offset_count; m++)
-			fprintf(fd," %lu",(unsigned long)sp->actable_offset[m]);
-		fprintf(fd,"\n");
-	}
-	if (TIFFFieldSet(tif,FIELD_OJPEG_JPEGPROC))
-		fprintf(fd,"  JpegProc: %u\n",(unsigned int)sp->jpeg_proc);
-	if (TIFFFieldSet(tif,FIELD_OJPEG_JPEGRESTARTINTERVAL))
-		fprintf(fd,"  JpegRestartInterval: %u\n",(unsigned int)sp->restart_interval);
-}
-
-static int
-OJPEGSetupDecode(TIFF* tif)
-{
-	static const char module[]="OJPEGSetupDecode";
-	TIFFWarningExt(tif->tif_clientdata,module,"Depreciated and troublesome old-style JPEG compression mode, please convert to new-style JPEG compression and notify vendor of writing software");
-	return(1);
-}
-
-static int
-OJPEGPreDecode(TIFF* tif, tsample_t s)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	tstrile_t m;
-	if (sp->subsamplingcorrect_done==0)
-		OJPEGSubsamplingCorrect(tif);
-	if (sp->readheader_done==0)
-	{
-		if (OJPEGReadHeaderInfo(tif)==0)
-			return(0);
-	}
-	if (sp->sos_end[s].log==0)
-	{
-		if (OJPEGReadSecondarySos(tif,s)==0)
-			return(0);
-	}
-	if isTiled(tif)
-		m=(tstrile_t)tif->tif_curtile;
-	else
-		m=(tstrile_t)tif->tif_curstrip;
-	if ((sp->writeheader_done!=0) && ((sp->write_cursample!=s) || (sp->write_curstrile>m)))
-	{
-		if (sp->libjpeg_session_active!=0)
-			OJPEGLibjpegSessionAbort(tif);
-		sp->writeheader_done=0;
-	}
-	if (sp->writeheader_done==0)
-	{
-		sp->plane_sample_offset=s;
-		sp->write_cursample=s;
-		sp->write_curstrile=s*tif->tif_dir.td_stripsperimage;
-		if ((sp->in_buffer_file_pos_log==0) ||
-		    (sp->in_buffer_file_pos-sp->in_buffer_togo!=sp->sos_end[s].in_buffer_file_pos))
-		{
-			sp->in_buffer_source=sp->sos_end[s].in_buffer_source;
-			sp->in_buffer_next_strile=sp->sos_end[s].in_buffer_next_strile;
-			sp->in_buffer_file_pos=sp->sos_end[s].in_buffer_file_pos;
-			sp->in_buffer_file_pos_log=0;
-			sp->in_buffer_file_togo=sp->sos_end[s].in_buffer_file_togo;
-			sp->in_buffer_togo=0;
-			sp->in_buffer_cur=0;
-		}
-		if (OJPEGWriteHeaderInfo(tif)==0)
-			return(0);
-	}
-	while (sp->write_curstrile<m)          
-	{
-		if (sp->libjpeg_jpeg_query_style==0)
-		{
-			if (OJPEGPreDecodeSkipRaw(tif)==0)
-				return(0);
-		}
-		else
-		{
-			if (OJPEGPreDecodeSkipScanlines(tif)==0)
-				return(0);
-		}
-		sp->write_curstrile++;
-	}
-	return(1);
-}
-
-static int
-OJPEGPreDecodeSkipRaw(TIFF* tif)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint32 m;
-	m=sp->lines_per_strile;
-	if (sp->subsampling_convert_state!=0)
-	{
-		if (sp->subsampling_convert_clines-sp->subsampling_convert_state>=m)
-		{
-			sp->subsampling_convert_state+=m;
-			if (sp->subsampling_convert_state==sp->subsampling_convert_clines)
-				sp->subsampling_convert_state=0;
-			return(1);
-		}
-		m-=sp->subsampling_convert_clines-sp->subsampling_convert_state;
-		sp->subsampling_convert_state=0;
-	}
-	while (m>=sp->subsampling_convert_clines)
-	{
-		if (jpeg_read_raw_data_encap(sp,&(sp->libjpeg_jpeg_decompress_struct),sp->subsampling_convert_ycbcrimage,sp->subsampling_ver*8)==0)
-			return(0);
-		m-=sp->subsampling_convert_clines;
-	}
-	if (m>0)
-	{
-		if (jpeg_read_raw_data_encap(sp,&(sp->libjpeg_jpeg_decompress_struct),sp->subsampling_convert_ycbcrimage,sp->subsampling_ver*8)==0)
-			return(0);
-		sp->subsampling_convert_state=m;
-	}
-	return(1);
-}
-
-static int
-OJPEGPreDecodeSkipScanlines(TIFF* tif)
-{
-	static const char module[]="OJPEGPreDecodeSkipScanlines";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint32 m;
-	if (sp->skip_buffer==NULL)
-	{
-		sp->skip_buffer=_TIFFmalloc(sp->bytes_per_line);
-		if (sp->skip_buffer==NULL)
-		{
-			TIFFErrorExt(tif->tif_clientdata,module,"Out of memory");
-			return(0);
-		}
-	}
-	for (m=0; m<sp->lines_per_strile; m++)
-	{
-		if (jpeg_read_scanlines_encap(sp,&(sp->libjpeg_jpeg_decompress_struct),&sp->skip_buffer,1)==0)
-			return(0);
-	}
-	return(1);
-}
-
-static int
-OJPEGDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	(void)s;
-	if (sp->libjpeg_jpeg_query_style==0)
-	{
-		if (OJPEGDecodeRaw(tif,buf,cc)==0)
-			return(0);
-	}
-	else
-	{
-		if (OJPEGDecodeScanlines(tif,buf,cc)==0)
-			return(0);
-	}
-	return(1);
-}
-
-static int
-OJPEGDecodeRaw(TIFF* tif, tidata_t buf, tsize_t cc)
-{
-	static const char module[]="OJPEGDecodeRaw";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8* m;
-	uint32 n;
-	uint8* oy;
-	uint8* ocb;
-	uint8* ocr;
-	uint8* p;
-	uint32 q;
-	uint8* r;
-	uint8 sx,sy;
-	if (cc%sp->bytes_per_line!=0)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Fractional scanline not read");
-		return(0);
-	}
-	assert(cc>0);
-	m=buf;
-	n=cc;
-	do
-	{
-		if (sp->subsampling_convert_state==0)
-		{
-			if (jpeg_read_raw_data_encap(sp,&(sp->libjpeg_jpeg_decompress_struct),sp->subsampling_convert_ycbcrimage,sp->subsampling_ver*8)==0)
-				return(0);
-		}
-		oy=sp->subsampling_convert_ybuf+sp->subsampling_convert_state*sp->subsampling_ver*sp->subsampling_convert_ylinelen;
-		ocb=sp->subsampling_convert_cbbuf+sp->subsampling_convert_state*sp->subsampling_convert_clinelen;
-		ocr=sp->subsampling_convert_crbuf+sp->subsampling_convert_state*sp->subsampling_convert_clinelen;
-		p=m;
-		for (q=0; q<sp->subsampling_convert_clinelenout; q++)
-		{
-			r=oy;
-			for (sy=0; sy<sp->subsampling_ver; sy++)
-			{
-				for (sx=0; sx<sp->subsampling_hor; sx++)
-					*p++=*r++;
-				r+=sp->subsampling_convert_ylinelen-sp->subsampling_hor;
-			}
-			oy+=sp->subsampling_hor;
-			*p++=*ocb++;
-			*p++=*ocr++;
-		}
-		sp->subsampling_convert_state++;
-		if (sp->subsampling_convert_state==sp->subsampling_convert_clines)
-			sp->subsampling_convert_state=0;
-		m+=sp->bytes_per_line;
-		n-=sp->bytes_per_line;
-	} while(n>0);
-	return(1);
-}
-
-static int
-OJPEGDecodeScanlines(TIFF* tif, tidata_t buf, tsize_t cc)
-{
-	static const char module[]="OJPEGDecodeScanlines";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8* m;
-	uint32 n;
-	if (cc%sp->bytes_per_line!=0)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Fractional scanline not read");
-		return(0);
-	}
-	assert(cc>0);
-	m=buf;
-	n=cc;
-	do
-	{
-		if (jpeg_read_scanlines_encap(sp,&(sp->libjpeg_jpeg_decompress_struct),&m,1)==0)
-			return(0);
-		m+=sp->bytes_per_line;
-		n-=sp->bytes_per_line;
-	} while(n>0);
-	return(1);
+    char buffer[JMSG_LENGTH_MAX];
+    int code = cinfo->err->msg_code;
+
+    if (((OJPEGState *)cinfo)->is_WANG) {
+	if (code == JERR_SOF_DUPLICATE || code == JERR_SOI_DUPLICATE)
+	    return;	    /* ignore it */
+    }
+
+    (*cinfo->err->format_message)(cinfo,buffer);
+    TIFFError(JPEGLib_name,buffer); /* Display error message */
+    jpeg_abort(cinfo); /* Clean up JPEG Library state */
+    LONGJMP(((OJPEGState *)cinfo)->exit_jmpbuf,1); /* Return to TIFF client */
 }
 
 static void
-OJPEGPostDecode(TIFF* tif, tidata_t buf, tsize_t cc)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	(void)buf;
-	(void)cc;
-	sp->write_curstrile++;
-	if (sp->write_curstrile%tif->tif_dir.td_stripsperimage==0)
-	{
-		assert(sp->libjpeg_session_active!=0);
-		OJPEGLibjpegSessionAbort(tif);
-		sp->writeheader_done=0;
-	}
-}
-
-static int
-OJPEGSetupEncode(TIFF* tif)
-{
-	static const char module[]="OJPEGSetupEncode";
-	TIFFErrorExt(tif->tif_clientdata,module,"OJPEG encoding not supported; use new-style JPEG compression instead");
-	return(0);
-}
+TIFFojpeg_output_message(register j_common_ptr cinfo)
+  { char buffer[JMSG_LENGTH_MAX];
 
-static int
-OJPEGPreEncode(TIFF* tif, tsample_t s)
-{
-	static const char module[]="OJPEGPreEncode";
-	(void)s;
-	TIFFErrorExt(tif->tif_clientdata,module,"OJPEG encoding not supported; use new-style JPEG compression instead");
-	return(0);
-}
+ /* This subroutine is invoked only for warning messages, since the JPEG
+    Library's "error_exit" method does its own thing and "trace_level" is never
+    set > 0.
+ */
+    (*cinfo->err->format_message)(cinfo,buffer);
+    TIFFWarning(JPEGLib_name,buffer);
+  }
 
-static int
-OJPEGEncode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
-{
-	static const char module[]="OJPEGEncode";
-	(void)buf;
-	(void)cc;
-	(void)s;
-	TIFFErrorExt(tif->tif_clientdata,module,"OJPEG encoding not supported; use new-style JPEG compression instead");
-	return(0);
-}
+/* The following subroutines, which also interface with the JPEG Library, exist
+   mainly in limit the side effects of "setjmp()" and convert JPEG normal/error
+   conditions into TIFF Library return codes.
+*/
+#define CALLJPEG(sp,fail,op)(SETJMP((sp)->exit_jmpbuf)?(fail):(op))
+#define CALLVJPEG(sp,op)CALLJPEG(sp,0,((op),1))
+#ifdef never
 
 static int
-OJPEGPostEncode(TIFF* tif)
-{
-	static const char module[]="OJPEGPostEncode";
-	TIFFErrorExt(tif->tif_clientdata,module,"OJPEG encoding not supported; use new-style JPEG compression instead");
-	return(0);
-}
-
-static void
-OJPEGCleanup(TIFF* tif)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	if (sp!=0)
-	{
-		tif->tif_tagmethods.vgetfield=sp->vgetparent;
-		tif->tif_tagmethods.vsetfield=sp->vsetparent;
-		if (sp->qtable[0]!=0)
-			_TIFFfree(sp->qtable[0]);
-		if (sp->qtable[1]!=0)
-			_TIFFfree(sp->qtable[1]);
-		if (sp->qtable[2]!=0)
-			_TIFFfree(sp->qtable[2]);
-		if (sp->qtable[3]!=0)
-			_TIFFfree(sp->qtable[3]);
-		if (sp->dctable[0]!=0)
-			_TIFFfree(sp->dctable[0]);
-		if (sp->dctable[1]!=0)
-			_TIFFfree(sp->dctable[1]);
-		if (sp->dctable[2]!=0)
-			_TIFFfree(sp->dctable[2]);
-		if (sp->dctable[3]!=0)
-			_TIFFfree(sp->dctable[3]);
-		if (sp->actable[0]!=0)
-			_TIFFfree(sp->actable[0]);
-		if (sp->actable[1]!=0)
-			_TIFFfree(sp->actable[1]);
-		if (sp->actable[2]!=0)
-			_TIFFfree(sp->actable[2]);
-		if (sp->actable[3]!=0)
-			_TIFFfree(sp->actable[3]);
-		if (sp->libjpeg_session_active!=0)
-			OJPEGLibjpegSessionAbort(tif);
-		if (sp->subsampling_convert_ycbcrbuf!=0)
-			_TIFFfree(sp->subsampling_convert_ycbcrbuf);
-		if (sp->subsampling_convert_ycbcrimage!=0)
-			_TIFFfree(sp->subsampling_convert_ycbcrimage);
-		if (sp->skip_buffer!=0)
-			_TIFFfree(sp->skip_buffer);
-		_TIFFfree(sp);
-		tif->tif_data=NULL;
-		_TIFFSetDefaultCompressionState(tif);
-	}
-}
-
+TIFFojpeg_create_compress(register OJPEGState *sp)
+  {
+    sp->cinfo.c.err = jpeg_std_error(&sp->err); /* Initialize error handling */
+    sp->err.error_exit = TIFFojpeg_error_exit;
+    sp->err.output_message = TIFFojpeg_output_message;
+    return CALLVJPEG(sp,jpeg_create_compress(&sp->cinfo.c));
+  }
+
+/* The following subroutines comprise a JPEG Library "destination" data manager
+   by directing compressed data from the JPEG Library to a TIFF Library output
+   buffer.
+*/
 static void
-OJPEGSubsamplingCorrect(TIFF* tif)
-{
-	static const char module[]="OJPEGSubsamplingCorrect";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8 mh;
-	uint8 mv;
-	assert(sp->subsamplingcorrect_done==0);
-	if ((tif->tif_dir.td_samplesperpixel!=3) || ((tif->tif_dir.td_photometric!=PHOTOMETRIC_YCBCR) &&
-	    (tif->tif_dir.td_photometric!=PHOTOMETRIC_ITULAB)))
-	{
-		if (sp->subsampling_tag!=0)
-			TIFFWarningExt(tif->tif_clientdata,module,"Subsampling tag not appropriate for this Photometric and/or SamplesPerPixel");
-		sp->subsampling_hor=1;
-		sp->subsampling_ver=1;
-		sp->subsampling_force_desubsampling_inside_decompression=0;
-	}
-	else
-	{
-		sp->subsamplingcorrect_done=1;
-		mh=sp->subsampling_hor;
-		mv=sp->subsampling_ver;
-		sp->subsamplingcorrect=1;
-		OJPEGReadHeaderInfoSec(tif);
-		if (sp->subsampling_force_desubsampling_inside_decompression!=0)
-		{
-			sp->subsampling_hor=1;
-			sp->subsampling_ver=1;
-		}
-		sp->subsamplingcorrect=0;
-		if (((sp->subsampling_hor!=mh) || (sp->subsampling_ver!=mv)) && (sp->subsampling_force_desubsampling_inside_decompression==0))
-		{
-			if (sp->subsampling_tag==0)
-				TIFFWarningExt(tif->tif_clientdata,module,"Subsampling tag is not set, yet subsampling inside JPEG data [%d,%d] does not match default values [2,2]; assuming subsampling inside JPEG data is correct",sp->subsampling_hor,sp->subsampling_ver);
-			else
-				TIFFWarningExt(tif->tif_clientdata,module,"Subsampling inside JPEG data [%d,%d] does not match subsampling tag values [%d,%d]; assuming subsampling inside JPEG data is correct",sp->subsampling_hor,sp->subsampling_ver,mh,mv);
-		}
-		if (sp->subsampling_force_desubsampling_inside_decompression!=0)
-		{
-			if (sp->subsampling_tag==0)
-				TIFFWarningExt(tif->tif_clientdata,module,"Subsampling tag is not set, yet subsampling inside JPEG data does not match default values [2,2] (nor any other values allowed in TIFF); assuming subsampling inside JPEG data is correct and desubsampling inside JPEG decompression");
-			else
-				TIFFWarningExt(tif->tif_clientdata,module,"Subsampling inside JPEG data does not match subsampling tag values [%d,%d] (nor any other values allowed in TIFF); assuming subsampling inside JPEG data is correct and desubsampling inside JPEG decompression",mh,mv);
-		}
-		if (sp->subsampling_force_desubsampling_inside_decompression==0)
-		{
-			if (sp->subsampling_hor<sp->subsampling_ver)
-				TIFFWarningExt(tif->tif_clientdata,module,"Subsampling values [%d,%d] are not allowed in TIFF",sp->subsampling_hor,sp->subsampling_ver);
-		}
-	}
-	sp->subsamplingcorrect_done=1;
-}
-
-static int
-OJPEGReadHeaderInfo(TIFF* tif)
-{
-	static const char module[]="OJPEGReadHeaderInfo";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	assert(sp->readheader_done==0);
-	sp->image_width=tif->tif_dir.td_imagewidth;
-	sp->image_length=tif->tif_dir.td_imagelength;
-	if isTiled(tif)
-	{
-		sp->strile_width=tif->tif_dir.td_tilewidth;
-		sp->strile_length=tif->tif_dir.td_tilelength;
-		sp->strile_length_total=((sp->image_length+sp->strile_length-1)/sp->strile_length)*sp->strile_length;
-	}
-	else
-	{
-		sp->strile_width=sp->image_width;
-		sp->strile_length=tif->tif_dir.td_rowsperstrip;
-		sp->strile_length_total=sp->image_length;
-	}
-	sp->samples_per_pixel=tif->tif_dir.td_samplesperpixel;
-	if (sp->samples_per_pixel==1)
-	{
-		sp->plane_sample_offset=0;
-		sp->samples_per_pixel_per_plane=sp->samples_per_pixel;
-		sp->subsampling_hor=1;
-		sp->subsampling_ver=1;
-	}
-	else
-	{
-		if (sp->samples_per_pixel!=3)
-		{
-			TIFFErrorExt(tif->tif_clientdata,module,"SamplesPerPixel %d not supported for this compression scheme",sp->samples_per_pixel);
-			return(0);
-		}
-		sp->plane_sample_offset=0;
-		if (tif->tif_dir.td_planarconfig==PLANARCONFIG_CONTIG)
-			sp->samples_per_pixel_per_plane=3;
-		else
-			sp->samples_per_pixel_per_plane=1;
-	}
-	if (sp->strile_length<sp->image_length)
-	{
-		if (sp->strile_length%(sp->subsampling_ver*8)!=0)
-		{
-			TIFFErrorExt(tif->tif_clientdata,module,"Incompatible vertical subsampling and image strip/tile length");
-			return(0);
-		}
-		sp->restart_interval=((sp->strile_width+sp->subsampling_hor*8-1)/(sp->subsampling_hor*8))*(sp->strile_length/(sp->subsampling_ver*8));
-	}
-	if (OJPEGReadHeaderInfoSec(tif)==0)
-		return(0);
-	sp->sos_end[0].log=1;
-	sp->sos_end[0].in_buffer_source=sp->in_buffer_source;
-	sp->sos_end[0].in_buffer_next_strile=sp->in_buffer_next_strile;
-	sp->sos_end[0].in_buffer_file_pos=sp->in_buffer_file_pos-sp->in_buffer_togo;
-	sp->sos_end[0].in_buffer_file_togo=sp->in_buffer_file_togo+sp->in_buffer_togo;
-	sp->readheader_done=1;
-	return(1);
-}
+std_init_destination(register j_compress_ptr cinfo){} /* "Dummy" stub */
 
-static int
-OJPEGReadSecondarySos(TIFF* tif, tsample_t s)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8 m;
-	assert(s>0);
-	assert(s<3);
-	assert(sp->sos_end[0].log!=0);
-	assert(sp->sos_end[s].log==0);
-	sp->plane_sample_offset=s-1;
-	while(sp->sos_end[sp->plane_sample_offset].log==0)
-		sp->plane_sample_offset--;
-	sp->in_buffer_source=sp->sos_end[sp->plane_sample_offset].in_buffer_source;
-	sp->in_buffer_next_strile=sp->sos_end[sp->plane_sample_offset].in_buffer_next_strile;
-	sp->in_buffer_file_pos=sp->sos_end[sp->plane_sample_offset].in_buffer_file_pos;  
-	sp->in_buffer_file_pos_log=0;
-	sp->in_buffer_file_togo=sp->sos_end[sp->plane_sample_offset].in_buffer_file_togo;
-	sp->in_buffer_togo=0;
-	sp->in_buffer_cur=0;
-	while(sp->plane_sample_offset<s)
-	{
-		do
-		{
-			if (OJPEGReadByte(sp,&m)==0)
-				return(0);
-			if (m==255)
-			{
-				do
-				{
-					if (OJPEGReadByte(sp,&m)==0)
-						return(0);
-					if (m!=255)
-						break;
-				} while(1);
-				if (m==JPEG_MARKER_SOS)
-					break;
-			}
-		} while(1);
-		sp->plane_sample_offset++;
-		if (OJPEGReadHeaderInfoSecStreamSos(tif)==0)
-			return(0);
-		sp->sos_end[sp->plane_sample_offset].log=1;
-		sp->sos_end[sp->plane_sample_offset].in_buffer_source=sp->in_buffer_source;
-		sp->sos_end[sp->plane_sample_offset].in_buffer_next_strile=sp->in_buffer_next_strile;
-		sp->sos_end[sp->plane_sample_offset].in_buffer_file_pos=sp->in_buffer_file_pos-sp->in_buffer_togo;
-		sp->sos_end[sp->plane_sample_offset].in_buffer_file_togo=sp->in_buffer_file_togo+sp->in_buffer_togo;
-	}
-	return(1);
-}
-
-static int
-OJPEGWriteHeaderInfo(TIFF* tif)
-{
-	static const char module[]="OJPEGWriteHeaderInfo";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8** m;
-	uint32 n;
-	assert(sp->libjpeg_session_active==0);
-	sp->out_state=ososSoi;
-	sp->restart_index=0;
-	jpeg_std_error(&(sp->libjpeg_jpeg_error_mgr));
-	sp->libjpeg_jpeg_error_mgr.output_message=OJPEGLibjpegJpegErrorMgrOutputMessage;
-	sp->libjpeg_jpeg_error_mgr.error_exit=OJPEGLibjpegJpegErrorMgrErrorExit;
-	sp->libjpeg_jpeg_decompress_struct.err=&(sp->libjpeg_jpeg_error_mgr);
-	sp->libjpeg_jpeg_decompress_struct.client_data=(void*)tif;
-	if (jpeg_create_decompress_encap(sp,&(sp->libjpeg_jpeg_decompress_struct))==0)
-		return(0);
-	sp->libjpeg_session_active=1;
-	sp->libjpeg_jpeg_source_mgr.bytes_in_buffer=0;
-	sp->libjpeg_jpeg_source_mgr.init_source=OJPEGLibjpegJpegSourceMgrInitSource;
-	sp->libjpeg_jpeg_source_mgr.fill_input_buffer=OJPEGLibjpegJpegSourceMgrFillInputBuffer;
-	sp->libjpeg_jpeg_source_mgr.skip_input_data=OJPEGLibjpegJpegSourceMgrSkipInputData;
-	sp->libjpeg_jpeg_source_mgr.resync_to_restart=OJPEGLibjpegJpegSourceMgrResyncToRestart;
-	sp->libjpeg_jpeg_source_mgr.term_source=OJPEGLibjpegJpegSourceMgrTermSource;
-	sp->libjpeg_jpeg_decompress_struct.src=&(sp->libjpeg_jpeg_source_mgr);
-	if (jpeg_read_header_encap(sp,&(sp->libjpeg_jpeg_decompress_struct),1)==0)
-		return(0);
-	if ((sp->subsampling_force_desubsampling_inside_decompression==0) && (sp->samples_per_pixel_per_plane>1))
-	{
-		sp->libjpeg_jpeg_decompress_struct.raw_data_out=1;
-#if JPEG_LIB_VERSION >= 70
-		sp->libjpeg_jpeg_decompress_struct.do_fancy_upsampling=FALSE;
-#endif
-		sp->libjpeg_jpeg_query_style=0;
-		if (sp->subsampling_convert_log==0)
-		{
-			assert(sp->subsampling_convert_ycbcrbuf==0);
-			assert(sp->subsampling_convert_ycbcrimage==0);
-			sp->subsampling_convert_ylinelen=((sp->strile_width+sp->subsampling_hor*8-1)/(sp->subsampling_hor*8)*sp->subsampling_hor*8);
-			sp->subsampling_convert_ylines=sp->subsampling_ver*8;
-			sp->subsampling_convert_clinelen=sp->subsampling_convert_ylinelen/sp->subsampling_hor;
-			sp->subsampling_convert_clines=8;
-			sp->subsampling_convert_ybuflen=sp->subsampling_convert_ylinelen*sp->subsampling_convert_ylines;
-			sp->subsampling_convert_cbuflen=sp->subsampling_convert_clinelen*sp->subsampling_convert_clines;
-			sp->subsampling_convert_ycbcrbuflen=sp->subsampling_convert_ybuflen+2*sp->subsampling_convert_cbuflen;
-			sp->subsampling_convert_ycbcrbuf=_TIFFmalloc(sp->subsampling_convert_ycbcrbuflen);
-			if (sp->subsampling_convert_ycbcrbuf==0)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Out of memory");
-				return(0);
-			}
-			sp->subsampling_convert_ybuf=sp->subsampling_convert_ycbcrbuf;
-			sp->subsampling_convert_cbbuf=sp->subsampling_convert_ybuf+sp->subsampling_convert_ybuflen;
-			sp->subsampling_convert_crbuf=sp->subsampling_convert_cbbuf+sp->subsampling_convert_cbuflen;
-			sp->subsampling_convert_ycbcrimagelen=3+sp->subsampling_convert_ylines+2*sp->subsampling_convert_clines;
-			sp->subsampling_convert_ycbcrimage=_TIFFmalloc(sp->subsampling_convert_ycbcrimagelen*sizeof(uint8*));
-			if (sp->subsampling_convert_ycbcrimage==0)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Out of memory");
-				return(0);
-			}
-			m=sp->subsampling_convert_ycbcrimage;
-			*m++=(uint8*)(sp->subsampling_convert_ycbcrimage+3);
-			*m++=(uint8*)(sp->subsampling_convert_ycbcrimage+3+sp->subsampling_convert_ylines);
-			*m++=(uint8*)(sp->subsampling_convert_ycbcrimage+3+sp->subsampling_convert_ylines+sp->subsampling_convert_clines);
-			for (n=0; n<sp->subsampling_convert_ylines; n++)
-				*m++=sp->subsampling_convert_ybuf+n*sp->subsampling_convert_ylinelen;
-			for (n=0; n<sp->subsampling_convert_clines; n++)
-				*m++=sp->subsampling_convert_cbbuf+n*sp->subsampling_convert_clinelen;
-			for (n=0; n<sp->subsampling_convert_clines; n++)
-				*m++=sp->subsampling_convert_crbuf+n*sp->subsampling_convert_clinelen;
-			sp->subsampling_convert_clinelenout=((sp->strile_width+sp->subsampling_hor-1)/sp->subsampling_hor);
-			sp->subsampling_convert_state=0;
-			sp->bytes_per_line=sp->subsampling_convert_clinelenout*(sp->subsampling_ver*sp->subsampling_hor+2);
-			sp->lines_per_strile=((sp->strile_length+sp->subsampling_ver-1)/sp->subsampling_ver);
-			sp->subsampling_convert_log=1;
-		}
-	}
-	else
-	{
-		sp->libjpeg_jpeg_decompress_struct.jpeg_color_space=JCS_UNKNOWN;
-		sp->libjpeg_jpeg_decompress_struct.out_color_space=JCS_UNKNOWN;
-		sp->libjpeg_jpeg_query_style=1;
-		sp->bytes_per_line=sp->samples_per_pixel_per_plane*sp->strile_width;
-		sp->lines_per_strile=sp->strile_length;
-	}
-	if (jpeg_start_decompress_encap(sp,&(sp->libjpeg_jpeg_decompress_struct))==0)
-		return(0);
-	sp->writeheader_done=1;
-	return(1);
-}
+static boolean
+std_empty_output_buffer(register j_compress_ptr cinfo)
+  {
+#   define sp ((OJPEGState *)cinfo)
+    register TIFF *tif = sp->tif;
+
+    tif->tif_rawcc = tif->tif_rawdatasize; /* Entire buffer has been filled */
+    TIFFFlushData1(tif);
+    sp->dest.next_output_byte = (JOCTET *)tif->tif_rawdata;
+    sp->dest.free_in_buffer = (size_t)tif->tif_rawdatasize;
+    return TRUE;
+#   undef sp
+  }
 
 static void
-OJPEGLibjpegSessionAbort(TIFF* tif)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	assert(sp->libjpeg_session_active!=0);
-	jpeg_destroy((jpeg_common_struct*)(&(sp->libjpeg_jpeg_decompress_struct)));
-	sp->libjpeg_session_active=0;
-}
-
-static int
-OJPEGReadHeaderInfoSec(TIFF* tif)
-{
-	static const char module[]="OJPEGReadHeaderInfoSec";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8 m;
-	uint16 n;
-	uint8 o;
-	if (sp->file_size==0)
-		sp->file_size=TIFFGetFileSize(tif);
-	if (sp->jpeg_interchange_format!=0)
-	{
-		if (sp->jpeg_interchange_format>=sp->file_size)
-		{
-			sp->jpeg_interchange_format=0;
-			sp->jpeg_interchange_format_length=0;
-		}
-		else
-		{
-			if ((sp->jpeg_interchange_format_length==0) || (sp->jpeg_interchange_format+sp->jpeg_interchange_format_length>sp->file_size))
-				sp->jpeg_interchange_format_length=sp->file_size-sp->jpeg_interchange_format;
-		}
-	}
-	sp->in_buffer_source=osibsNotSetYet;
-	sp->in_buffer_next_strile=0;
-	sp->in_buffer_strile_count=tif->tif_dir.td_nstrips;   
-	sp->in_buffer_file_togo=0;
-	sp->in_buffer_togo=0;
-	do
-	{
-		if (OJPEGReadBytePeek(sp,&m)==0)
-			return(0);
-		if (m!=255)
-			break;
-		OJPEGReadByteAdvance(sp);
-		do
-		{
-			if (OJPEGReadByte(sp,&m)==0)
-				return(0);
-		} while(m==255);
-		switch(m)
-		{
-			case JPEG_MARKER_SOI:
-				/* this type of marker has no data, and should be skipped */
-				break;
-			case JPEG_MARKER_COM:
-			case JPEG_MARKER_APP0:
-			case JPEG_MARKER_APP0+1:
-			case JPEG_MARKER_APP0+2:
-			case JPEG_MARKER_APP0+3:
-			case JPEG_MARKER_APP0+4:
-			case JPEG_MARKER_APP0+5:
-			case JPEG_MARKER_APP0+6:
-			case JPEG_MARKER_APP0+7:
-			case JPEG_MARKER_APP0+8:
-			case JPEG_MARKER_APP0+9:
-			case JPEG_MARKER_APP0+10:
-			case JPEG_MARKER_APP0+11:
-			case JPEG_MARKER_APP0+12:
-			case JPEG_MARKER_APP0+13:
-			case JPEG_MARKER_APP0+14:
-			case JPEG_MARKER_APP0+15:
-				/* this type of marker has data, but it has no use to us (and no place here) and should be skipped */
-				if (OJPEGReadWord(sp,&n)==0)
-					return(0);
-				if (n<2)
-				{
-					if (sp->subsamplingcorrect==0)
-						TIFFErrorExt(tif->tif_clientdata,module,"Corrupt JPEG data");
-					return(0);
-				}
-				if (n>2)
-					OJPEGReadSkip(sp,n-2);
-				break;
-			case JPEG_MARKER_DRI:
-				if (OJPEGReadHeaderInfoSecStreamDri(tif)==0)
-					return(0);
-				break;
-			case JPEG_MARKER_DQT:
-				if (OJPEGReadHeaderInfoSecStreamDqt(tif)==0)
-					return(0);
-				break;
-			case JPEG_MARKER_DHT:
-				if (OJPEGReadHeaderInfoSecStreamDht(tif)==0)
-					return(0);
-				break;
-			case JPEG_MARKER_SOF0:
-			case JPEG_MARKER_SOF1:
-			case JPEG_MARKER_SOF3:
-				if (OJPEGReadHeaderInfoSecStreamSof(tif,m)==0)
-					return(0);
-				if (sp->subsamplingcorrect!=0)
-					return(1);
-				break;
-			case JPEG_MARKER_SOS:
-				if (sp->subsamplingcorrect!=0)
-					return(1);
-				assert(sp->plane_sample_offset==0);
-				if (OJPEGReadHeaderInfoSecStreamSos(tif)==0)
-					return(0);
-				break;
-			default:
-				TIFFErrorExt(tif->tif_clientdata,module,"Unknown marker type %d in JPEG data",m);
-				return(0);
-		}
-	} while(m!=JPEG_MARKER_SOS);
-	if (sp->subsamplingcorrect)
-		return(1);
-	if (sp->sof_log==0)
-	{
-		if (OJPEGReadHeaderInfoSecTablesQTable(tif)==0)
-			return(0);
-		sp->sof_marker_id=JPEG_MARKER_SOF0;
-		for (o=0; o<sp->samples_per_pixel; o++)
-			sp->sof_c[o]=o;
-		sp->sof_hv[0]=((sp->subsampling_hor<<4)|sp->subsampling_ver);
-		for (o=1; o<sp->samples_per_pixel; o++)
-			sp->sof_hv[o]=17;
-		sp->sof_x=sp->strile_width;
-		sp->sof_y=sp->strile_length_total;
-		sp->sof_log=1;
-		if (OJPEGReadHeaderInfoSecTablesDcTable(tif)==0)
-			return(0);
-		if (OJPEGReadHeaderInfoSecTablesAcTable(tif)==0)
-			return(0);
-		for (o=1; o<sp->samples_per_pixel; o++)
-			sp->sos_cs[o]=o;
-	}
-	return(1);
-}
+std_term_destination(register j_compress_ptr cinfo)
+  {
+#   define sp ((OJPEGState *)cinfo)
+    register TIFF *tif = sp->tif;
 
-static int
-OJPEGReadHeaderInfoSecStreamDri(TIFF* tif)
-{
-	/* this could easilly cause trouble in some cases... but no such cases have occured sofar */
-	static const char module[]="OJPEGReadHeaderInfoSecStreamDri";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint16 m;
-	if (OJPEGReadWord(sp,&m)==0)
-		return(0);
-	if (m!=4)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Corrupt DRI marker in JPEG data");
-		return(0);
-	}
-	if (OJPEGReadWord(sp,&m)==0)
-		return(0);
-	sp->restart_interval=m;
-	return(1);
-}
+ /* NB: The TIFF Library does the final buffer flush. */
+    tif->tif_rawcp = (tidata_t)sp->dest.next_output_byte;
+    tif->tif_rawcc = tif->tif_rawdatasize - (tsize_t)sp->dest.free_in_buffer;
+#   undef sp
+  }
 
-static int
-OJPEGReadHeaderInfoSecStreamDqt(TIFF* tif)
-{
-	/* this is a table marker, and it is to be saved as a whole for exact pushing on the jpeg stream later on */
-	static const char module[]="OJPEGReadHeaderInfoSecStreamDqt";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint16 m;
-	uint32 na;
-	uint8* nb;
-	uint8 o;
-	if (OJPEGReadWord(sp,&m)==0)
-		return(0);
-	if (m<=2)
-	{
-		if (sp->subsamplingcorrect==0)
-			TIFFErrorExt(tif->tif_clientdata,module,"Corrupt DQT marker in JPEG data");
-		return(0);
-	}
-	if (sp->subsamplingcorrect!=0)
-		OJPEGReadSkip(sp,m-2);
-	else
-	{
-		m-=2;
-		do
-		{
-			if (m<65)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Corrupt DQT marker in JPEG data");
-				return(0);
-			}
-			na=sizeof(uint32)+69;
-			nb=_TIFFmalloc(na);
-			if (nb==0)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Out of memory");
-				return(0);
-			}
-			*(uint32*)nb=na;
-			nb[sizeof(uint32)]=255;
-			nb[sizeof(uint32)+1]=JPEG_MARKER_DQT;
-			nb[sizeof(uint32)+2]=0;
-			nb[sizeof(uint32)+3]=67;
-			if (OJPEGReadBlock(sp,65,&nb[sizeof(uint32)+4])==0)
-				return(0);
-			o=nb[sizeof(uint32)+4]&15;
-			if (3<o)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Corrupt DQT marker in JPEG data");
-				return(0);
-			}
-			if (sp->qtable[o]!=0)
-				_TIFFfree(sp->qtable[o]);
-			sp->qtable[o]=nb;
-			m-=65;
-		} while(m>0);
-	}
-	return(1);
-}
-
-static int
-OJPEGReadHeaderInfoSecStreamDht(TIFF* tif)
-{
-	/* this is a table marker, and it is to be saved as a whole for exact pushing on the jpeg stream later on */
-	/* TODO: the following assumes there is only one table in this marker... but i'm not quite sure that assumption is guaranteed correct */
-	static const char module[]="OJPEGReadHeaderInfoSecStreamDht";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint16 m;
-	uint32 na;
-	uint8* nb;
-	uint8 o;
-	if (OJPEGReadWord(sp,&m)==0)
-		return(0);
-	if (m<=2)
-	{
-		if (sp->subsamplingcorrect==0)
-			TIFFErrorExt(tif->tif_clientdata,module,"Corrupt DHT marker in JPEG data");
-		return(0);
-	}
-	if (sp->subsamplingcorrect!=0)
-	{
-		OJPEGReadSkip(sp,m-2);
-	}
-	else
-	{
-		na=sizeof(uint32)+2+m;
-		nb=_TIFFmalloc(na);
-		if (nb==0)
-		{
-			TIFFErrorExt(tif->tif_clientdata,module,"Out of memory");
-			return(0);
-		}
-		*(uint32*)nb=na;
-		nb[sizeof(uint32)]=255;
-		nb[sizeof(uint32)+1]=JPEG_MARKER_DHT;
-		nb[sizeof(uint32)+2]=(m>>8);
-		nb[sizeof(uint32)+3]=(m&255);
-		if (OJPEGReadBlock(sp,m-2,&nb[sizeof(uint32)+4])==0)
-			return(0);
-		o=nb[sizeof(uint32)+4];
-		if ((o&240)==0)
-		{
-			if (3<o)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Corrupt DHT marker in JPEG data");
-				return(0);
-			}
-			if (sp->dctable[o]!=0)
-				_TIFFfree(sp->dctable[o]);
-			sp->dctable[o]=nb;
-		}
-		else
-		{
-			if ((o&240)!=16)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Corrupt DHT marker in JPEG data");
-				return(0);
-			}
-			o&=15;
-			if (3<o)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Corrupt DHT marker in JPEG data");
-				return(0);
-			}
-			if (sp->actable[o]!=0)
-				_TIFFfree(sp->actable[o]);
-			sp->actable[o]=nb;
-		}
-	}
-	return(1);
-}
-
-static int
-OJPEGReadHeaderInfoSecStreamSof(TIFF* tif, uint8 marker_id)
-{
-	/* this marker needs to be checked, and part of its data needs to be saved for regeneration later on */
-	static const char module[]="OJPEGReadHeaderInfoSecStreamSof";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint16 m;
-	uint16 n;
-	uint8 o;
-	uint16 p;
-	uint16 q;
-	if (sp->sof_log!=0)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Corrupt JPEG data");
-		return(0);
-	}
-	if (sp->subsamplingcorrect==0)
-		sp->sof_marker_id=marker_id;
-	/* Lf: data length */
-	if (OJPEGReadWord(sp,&m)==0)
-		return(0);
-	if (m<11)
-	{
-		if (sp->subsamplingcorrect==0)
-			TIFFErrorExt(tif->tif_clientdata,module,"Corrupt SOF marker in JPEG data");
-		return(0);
-	}
-	m-=8;
-	if (m%3!=0)
-	{
-		if (sp->subsamplingcorrect==0)
-			TIFFErrorExt(tif->tif_clientdata,module,"Corrupt SOF marker in JPEG data");
-		return(0);
-	}
-	n=m/3;
-	if (sp->subsamplingcorrect==0)
-	{
-		if (n!=sp->samples_per_pixel)
-		{
-			TIFFErrorExt(tif->tif_clientdata,module,"JPEG compressed data indicates unexpected number of samples");
-			return(0);
-		}
-	}
-	/* P: Sample precision */
-	if (OJPEGReadByte(sp,&o)==0)
-		return(0);
-	if (o!=8)
-	{
-		if (sp->subsamplingcorrect==0)
-			TIFFErrorExt(tif->tif_clientdata,module,"JPEG compressed data indicates unexpected number of bits per sample");
-		return(0);
-	}
-	/* Y: Number of lines, X: Number of samples per line */
-	if (sp->subsamplingcorrect)
-		OJPEGReadSkip(sp,4);
-	else
-	{
-		/* TODO: probably best to also add check on allowed upper bound, especially x, may cause buffer overflow otherwise i think */
-		/* Y: Number of lines */
-		if (OJPEGReadWord(sp,&p)==0)
-			return(0);
-		if ((p<sp->image_length) && (p<sp->strile_length_total))
-		{
-			TIFFErrorExt(tif->tif_clientdata,module,"JPEG compressed data indicates unexpected height");
-			return(0);
-		}
-		sp->sof_y=p;
-		/* X: Number of samples per line */
-		if (OJPEGReadWord(sp,&p)==0)
-			return(0);
-		if ((p<sp->image_width) && (p<sp->strile_width))
-		{
-			TIFFErrorExt(tif->tif_clientdata,module,"JPEG compressed data indicates unexpected width");
-			return(0);
-		}
-		sp->sof_x=p;
-	}
-	/* Nf: Number of image components in frame */
-	if (OJPEGReadByte(sp,&o)==0)
-		return(0);
-	if (o!=n)
-	{
-		if (sp->subsamplingcorrect==0)
-			TIFFErrorExt(tif->tif_clientdata,module,"Corrupt SOF marker in JPEG data");
-		return(0);
-	}
-	/* per component stuff */
-	/* TODO: double-check that flow implies that n cannot be as big as to make us overflow sof_c, sof_hv and sof_tq arrays */
-	for (q=0; q<n; q++)
-	{
-		/* C: Component identifier */
-		if (OJPEGReadByte(sp,&o)==0)
-			return(0);
-		if (sp->subsamplingcorrect==0)
-			sp->sof_c[q]=o;
-		/* H: Horizontal sampling factor, and V: Vertical sampling factor */
-		if (OJPEGReadByte(sp,&o)==0)
-			return(0);
-		if (sp->subsamplingcorrect!=0)
-		{
-			if (q==0)
-			{
-				sp->subsampling_hor=(o>>4);
-				sp->subsampling_ver=(o&15);
-				if (((sp->subsampling_hor!=1) && (sp->subsampling_hor!=2) && (sp->subsampling_hor!=4)) ||
-					((sp->subsampling_ver!=1) && (sp->subsampling_ver!=2) && (sp->subsampling_ver!=4)))
-					sp->subsampling_force_desubsampling_inside_decompression=1;
-			}
-			else
-			{
-				if (o!=17)
-					sp->subsampling_force_desubsampling_inside_decompression=1;
-			}
-		}
-		else
-		{
-			sp->sof_hv[q]=o;
-			if (sp->subsampling_force_desubsampling_inside_decompression==0)
-			{
-				if (q==0)
-				{
-					if (o!=((sp->subsampling_hor<<4)|sp->subsampling_ver))
-					{
-						TIFFErrorExt(tif->tif_clientdata,module,"JPEG compressed data indicates unexpected subsampling values");
-						return(0);
-					}
-				}
-				else
-				{
-					if (o!=17)
-					{
-						TIFFErrorExt(tif->tif_clientdata,module,"JPEG compressed data indicates unexpected subsampling values");
-						return(0);
-					}
-				}
-			}
-		}
-		/* Tq: Quantization table destination selector */
-		if (OJPEGReadByte(sp,&o)==0)
-			return(0);
-		if (sp->subsamplingcorrect==0)
-			sp->sof_tq[q]=o;
-	}
-	if (sp->subsamplingcorrect==0)
-		sp->sof_log=1;
-	return(1);
-}
-
-static int
-OJPEGReadHeaderInfoSecStreamSos(TIFF* tif)
-{
-	/* this marker needs to be checked, and part of its data needs to be saved for regeneration later on */
-	static const char module[]="OJPEGReadHeaderInfoSecStreamSos";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint16 m;
-	uint8 n;
-	uint8 o;
-	assert(sp->subsamplingcorrect==0);
-	if (sp->sof_log==0)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Corrupt SOS marker in JPEG data");
-		return(0);
-	}
-	/* Ls */
-	if (OJPEGReadWord(sp,&m)==0)
-		return(0);
-	if (m!=6+sp->samples_per_pixel_per_plane*2)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Corrupt SOS marker in JPEG data");
-		return(0);
-	}
-	/* Ns */
-	if (OJPEGReadByte(sp,&n)==0)
-		return(0);
-	if (n!=sp->samples_per_pixel_per_plane)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Corrupt SOS marker in JPEG data");
-		return(0);
-	}
-	/* Cs, Td, and Ta */
-	for (o=0; o<sp->samples_per_pixel_per_plane; o++)
-	{
-		/* Cs */
-		if (OJPEGReadByte(sp,&n)==0)
-			return(0);
-		sp->sos_cs[sp->plane_sample_offset+o]=n;
-		/* Td and Ta */
-		if (OJPEGReadByte(sp,&n)==0)
-			return(0);
-		sp->sos_tda[sp->plane_sample_offset+o]=n;
-	}
-	/* skip Ss, Se, Ah, en Al -> no check, as per Tom Lane recommendation, as per LibJpeg source */
-	OJPEGReadSkip(sp,3);
-	return(1);
-}
-
-static int
-OJPEGReadHeaderInfoSecTablesQTable(TIFF* tif)
-{
-	static const char module[]="OJPEGReadHeaderInfoSecTablesQTable";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8 m;
-	uint8 n;
-	uint32 oa;
-	uint8* ob;
-	uint32 p;
-	if (sp->qtable_offset[0]==0)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Missing JPEG tables");
-		return(0);
-	}
-	sp->in_buffer_file_pos_log=0;
-	for (m=0; m<sp->samples_per_pixel; m++)
-	{
-		if ((sp->qtable_offset[m]!=0) && ((m==0) || (sp->qtable_offset[m]!=sp->qtable_offset[m-1])))
-		{
-			for (n=0; n<m-1; n++)
-			{
-				if (sp->qtable_offset[m]==sp->qtable_offset[n])
-				{
-					TIFFErrorExt(tif->tif_clientdata,module,"Corrupt JpegQTables tag value");
-					return(0);
-				}
-			}
-			oa=sizeof(uint32)+69;
-			ob=_TIFFmalloc(oa);
-			if (ob==0)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Out of memory");
-				return(0);
-			}
-			*(uint32*)ob=oa;
-			ob[sizeof(uint32)]=255;
-			ob[sizeof(uint32)+1]=JPEG_MARKER_DQT;
-			ob[sizeof(uint32)+2]=0;
-			ob[sizeof(uint32)+3]=67;
-			ob[sizeof(uint32)+4]=m;
-			TIFFSeekFile(tif,sp->qtable_offset[m],SEEK_SET);
-			p=TIFFReadFile(tif,&ob[sizeof(uint32)+5],64);
-			if (p!=64)
-				return(0);
-			sp->qtable[m]=ob;
-			sp->sof_tq[m]=m;
-		}
-		else
-			sp->sof_tq[m]=sp->sof_tq[m-1];
-	}
-	return(1);
-}
-
-static int
-OJPEGReadHeaderInfoSecTablesDcTable(TIFF* tif)
-{
-	static const char module[]="OJPEGReadHeaderInfoSecTablesDcTable";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8 m;
-	uint8 n;
-	uint8 o[16];
-	uint32 p;
-	uint32 q;
-	uint32 ra;
-	uint8* rb;
-	if (sp->dctable_offset[0]==0)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Missing JPEG tables");
-		return(0);
-	}
-	sp->in_buffer_file_pos_log=0;
-	for (m=0; m<sp->samples_per_pixel; m++)
-	{
-		if ((sp->dctable_offset[m]!=0) && ((m==0) || (sp->dctable_offset[m]!=sp->dctable_offset[m-1])))
-		{
-			for (n=0; n<m-1; n++)
-			{
-				if (sp->dctable_offset[m]==sp->dctable_offset[n])
-				{
-					TIFFErrorExt(tif->tif_clientdata,module,"Corrupt JpegDcTables tag value");
-					return(0);
-				}
-			}
-			TIFFSeekFile(tif,sp->dctable_offset[m],SEEK_SET);
-			p=TIFFReadFile(tif,o,16);
-			if (p!=16)
-				return(0);
-			q=0;
-			for (n=0; n<16; n++)
-				q+=o[n];
-			ra=sizeof(uint32)+21+q;
-			rb=_TIFFmalloc(ra);
-			if (rb==0)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Out of memory");
-				return(0);
-			}
-			*(uint32*)rb=ra;
-			rb[sizeof(uint32)]=255;
-			rb[sizeof(uint32)+1]=JPEG_MARKER_DHT;
-			rb[sizeof(uint32)+2]=((19+q)>>8);
-			rb[sizeof(uint32)+3]=((19+q)&255);
-			rb[sizeof(uint32)+4]=m;
-			for (n=0; n<16; n++)
-				rb[sizeof(uint32)+5+n]=o[n];
-			p=TIFFReadFile(tif,&(rb[sizeof(uint32)+21]),q);
-			if (p!=q)
-				return(0);
-			sp->dctable[m]=rb;
-			sp->sos_tda[m]=(m<<4);
-		}
-		else
-			sp->sos_tda[m]=sp->sos_tda[m-1];
-	}
-	return(1);
-}
-
-static int
-OJPEGReadHeaderInfoSecTablesAcTable(TIFF* tif)
-{
-	static const char module[]="OJPEGReadHeaderInfoSecTablesAcTable";
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8 m;
-	uint8 n;
-	uint8 o[16];
-	uint32 p;
-	uint32 q;
-	uint32 ra;
-	uint8* rb;
-	if (sp->actable_offset[0]==0)
-	{
-		TIFFErrorExt(tif->tif_clientdata,module,"Missing JPEG tables");
-		return(0);
-	}
-	sp->in_buffer_file_pos_log=0;
-	for (m=0; m<sp->samples_per_pixel; m++)
-	{
-		if ((sp->actable_offset[m]!=0) && ((m==0) || (sp->actable_offset[m]!=sp->actable_offset[m-1])))
-		{
-			for (n=0; n<m-1; n++)
-			{
-				if (sp->actable_offset[m]==sp->actable_offset[n])
-				{
-					TIFFErrorExt(tif->tif_clientdata,module,"Corrupt JpegAcTables tag value");
-					return(0);
-				}
-			}
-			TIFFSeekFile(tif,sp->actable_offset[m],SEEK_SET);
-			p=TIFFReadFile(tif,o,16);
-			if (p!=16)
-				return(0);
-			q=0;
-			for (n=0; n<16; n++)
-				q+=o[n];
-			ra=sizeof(uint32)+21+q;
-			rb=_TIFFmalloc(ra);
-			if (rb==0)
-			{
-				TIFFErrorExt(tif->tif_clientdata,module,"Out of memory");
-				return(0);
-			}
-			*(uint32*)rb=ra;
-			rb[sizeof(uint32)]=255;
-			rb[sizeof(uint32)+1]=JPEG_MARKER_DHT;
-			rb[sizeof(uint32)+2]=((19+q)>>8);
-			rb[sizeof(uint32)+3]=((19+q)&255);
-			rb[sizeof(uint32)+4]=(16|m);
-			for (n=0; n<16; n++)
-				rb[sizeof(uint32)+5+n]=o[n];
-			p=TIFFReadFile(tif,&(rb[sizeof(uint32)+21]),q);
-			if (p!=q)
-				return(0);
-			sp->actable[m]=rb;
-			sp->sos_tda[m]=(sp->sos_tda[m]|m);
-		}
-		else
-			sp->sos_tda[m]=(sp->sos_tda[m]|(sp->sos_tda[m-1]&15));
-	}
-	return(1);
-}
-
-static int
-OJPEGReadBufferFill(OJPEGState* sp)
-{
-	uint16 m;
-	tsize_t n;
-	/* TODO: double-check: when subsamplingcorrect is set, no call to TIFFErrorExt or TIFFWarningExt should be made
-	 * in any other case, seek or read errors should be passed through */
-	do
-	{
-		if (sp->in_buffer_file_togo!=0)
-		{
-			if (sp->in_buffer_file_pos_log==0)
-			{
-				TIFFSeekFile(sp->tif,sp->in_buffer_file_pos,SEEK_SET);
-				sp->in_buffer_file_pos_log=1;
-			}
-			m=OJPEG_BUFFER;
-			if (m>sp->in_buffer_file_togo)
-				m=(uint16)sp->in_buffer_file_togo;
-			n=TIFFReadFile(sp->tif,sp->in_buffer,(tsize_t)m);
-			if (n==0)
-				return(0);
-			assert(n>0);
-			assert(n<=OJPEG_BUFFER);
-			assert(n<65536);
-			assert((uint16)n<=sp->in_buffer_file_togo);
-			m=(uint16)n;
-			sp->in_buffer_togo=m;
-			sp->in_buffer_cur=sp->in_buffer;
-			sp->in_buffer_file_togo-=m;
-			sp->in_buffer_file_pos+=m;
-			break;
-		}
-		sp->in_buffer_file_pos_log=0;
-		switch(sp->in_buffer_source)
-		{
-			case osibsNotSetYet:
-				if (sp->jpeg_interchange_format!=0)
-				{
-					sp->in_buffer_file_pos=sp->jpeg_interchange_format;
-					sp->in_buffer_file_togo=sp->jpeg_interchange_format_length;
-				}
-				sp->in_buffer_source=osibsJpegInterchangeFormat;
-				break;
-			case osibsJpegInterchangeFormat:
-				sp->in_buffer_source=osibsStrile;
-			case osibsStrile:
-				if (sp->in_buffer_next_strile==sp->in_buffer_strile_count)  
-					sp->in_buffer_source=osibsEof;
-				else
-				{
-					sp->in_buffer_file_pos=sp->tif->tif_dir.td_stripoffset[sp->in_buffer_next_strile];  
-					if (sp->in_buffer_file_pos!=0)
-					{
-						if (sp->in_buffer_file_pos>=sp->file_size)
-							sp->in_buffer_file_pos=0;
-						else
-						{
-							sp->in_buffer_file_togo=sp->tif->tif_dir.td_stripbytecount[sp->in_buffer_next_strile];  
-							if (sp->in_buffer_file_togo==0)
-								sp->in_buffer_file_pos=0;
-							else if (sp->in_buffer_file_pos+sp->in_buffer_file_togo>sp->file_size)
-								sp->in_buffer_file_togo=sp->file_size-sp->in_buffer_file_pos;
-						}
-					}
-					sp->in_buffer_next_strile++;
-				}
-				break;
-			default:
-				return(0);
-		}
-	} while (1);
-	return(1);
-}
-
-static int
-OJPEGReadByte(OJPEGState* sp, uint8* byte)
-{
-	if (sp->in_buffer_togo==0)
-	{
-		if (OJPEGReadBufferFill(sp)==0)
-			return(0);
-		assert(sp->in_buffer_togo>0);
-	}
-	*byte=*(sp->in_buffer_cur);
-	sp->in_buffer_cur++;
-	sp->in_buffer_togo--;
-	return(1);
-}
-
-static int
-OJPEGReadBytePeek(OJPEGState* sp, uint8* byte)
-{
-	if (sp->in_buffer_togo==0)
-	{
-		if (OJPEGReadBufferFill(sp)==0)
-			return(0);
-		assert(sp->in_buffer_togo>0);
-	}
-	*byte=*(sp->in_buffer_cur);
-	return(1);
-}
+/* Alternate destination manager to output JPEGTables field: */
 
 static void
-OJPEGReadByteAdvance(OJPEGState* sp)
-{
-	assert(sp->in_buffer_togo>0);
-	sp->in_buffer_cur++;
-	sp->in_buffer_togo--;
-}
-
-static int
-OJPEGReadWord(OJPEGState* sp, uint16* word)
-{
-	uint8 m;
-	if (OJPEGReadByte(sp,&m)==0)
-		return(0);
-	*word=(m<<8);
-	if (OJPEGReadByte(sp,&m)==0)
-		return(0);
-	*word|=m;
-	return(1);
-}
+tables_init_destination(register j_compress_ptr cinfo)
+  {
+#   define sp ((OJPEGState *)cinfo)
+ /* The "jpegtables_length" field is the allocated buffer size while building */
+    sp->dest.next_output_byte = (JOCTET *)sp->jpegtables;
+    sp->dest.free_in_buffer = (size_t)sp->jpegtables_length;
+#   undef sp
+  }
 
-static int
-OJPEGReadBlock(OJPEGState* sp, uint16 len, void* mem)
-{
-	uint16 mlen;
-	uint8* mmem;
-	uint16 n;
-	assert(len>0);
-	mlen=len;
-	mmem=mem;
-	do
-	{
-		if (sp->in_buffer_togo==0)
-		{
-			if (OJPEGReadBufferFill(sp)==0)
-				return(0);
-			assert(sp->in_buffer_togo>0);
-		}
-		n=mlen;
-		if (n>sp->in_buffer_togo)
-			n=sp->in_buffer_togo;
-		_TIFFmemcpy(mmem,sp->in_buffer_cur,n);
-		sp->in_buffer_cur+=n;
-		sp->in_buffer_togo-=n;
-		mlen-=n;
-		mmem+=n;
-	} while(mlen>0);
-	return(1);
-}
+static boolean
+tables_empty_output_buffer(register j_compress_ptr cinfo)
+  { void *newbuf;
+#   define sp ((OJPEGState *)cinfo)
+
+ /* The entire buffer has been filled, so enlarge it by 1000 bytes. */
+    if (!( newbuf = _TIFFrealloc( (tdata_t)sp->jpegtables
+                                , (tsize_t)(sp->jpegtables_length + 1000)
+                                )
+         )
+       ) ERREXIT1(cinfo,JERR_OUT_OF_MEMORY,100);
+    sp->dest.next_output_byte = (JOCTET *)newbuf + sp->jpegtables_length;
+    sp->dest.free_in_buffer = (size_t)1000;
+    sp->jpegtables = newbuf;
+    sp->jpegtables_length += 1000;
+    return TRUE;
+#   undef sp
+  }
 
 static void
-OJPEGReadSkip(OJPEGState* sp, uint16 len)
-{
-	uint16 m;
-	uint16 n;
-	m=len;
-	n=m;
-	if (n>sp->in_buffer_togo)
-		n=sp->in_buffer_togo;
-	sp->in_buffer_cur+=n;
-	sp->in_buffer_togo-=n;
-	m-=n;
-	if (m>0)
-	{
-		assert(sp->in_buffer_togo==0);
-		n=m;
-		if (n>sp->in_buffer_file_togo)
-			n=sp->in_buffer_file_togo;
-		sp->in_buffer_file_pos+=n;
-		sp->in_buffer_file_togo-=n;
-		sp->in_buffer_file_pos_log=0;
-		/* we don't skip past jpeginterchangeformat/strile block...
-		 * if that is asked from us, we're dealing with totally bazurk
-		 * data anyway, and we've not seen this happening on any
-		 * testfile, so we might as well likely cause some other
-		 * meaningless error to be passed at some later time
-		 */
-	}
-}
+tables_term_destination(register j_compress_ptr cinfo)
+  {
+#   define sp ((OJPEGState *)cinfo)
+ /* Set tables length to no. of Bytes actually emitted. */
+    sp->jpegtables_length -= sp->dest.free_in_buffer;
+#   undef sp
+  }
+
+/*ARGSUSED*/ static int
+TIFFojpeg_tables_dest(register OJPEGState *sp, TIFF *tif)
+  {
+
+ /* Allocate a working buffer for building tables.  The initial size is 1000
+    Bytes, which is usually adequate.
+ */
+    if (sp->jpegtables) _TIFFfree(sp->jpegtables);
+    if (!(sp->jpegtables = (void*)
+                           _TIFFmalloc((tsize_t)(sp->jpegtables_length = 1000))
+         )
+       )
+      {
+        sp->jpegtables_length = 0;
+        TIFFError("TIFFojpeg_tables_dest",no_jtable_space);
+        return 0;
+      };
+    sp->cinfo.c.dest = &sp->dest;
+    sp->dest.init_destination = tables_init_destination;
+    sp->dest.empty_output_buffer = tables_empty_output_buffer;
+    sp->dest.term_destination = tables_term_destination;
+    return 1;
+  }
+#else /* well, hardly ever */
 
 static int
-OJPEGWriteStream(TIFF* tif, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	*len=0;
-	do
-	{
-		assert(sp->out_state<=ososEoi);
-		switch(sp->out_state)
-		{
-			case ososSoi:
-				OJPEGWriteStreamSoi(tif,mem,len);
-				break;
-			case ososQTable0:
-				OJPEGWriteStreamQTable(tif,0,mem,len);
-				break;
-			case ososQTable1:
-				OJPEGWriteStreamQTable(tif,1,mem,len);
-				break;
-			case ososQTable2:
-				OJPEGWriteStreamQTable(tif,2,mem,len);
-				break;
-			case ososQTable3:
-				OJPEGWriteStreamQTable(tif,3,mem,len);
-				break;
-			case ososDcTable0:
-				OJPEGWriteStreamDcTable(tif,0,mem,len);
-				break;
-			case ososDcTable1:
-				OJPEGWriteStreamDcTable(tif,1,mem,len);
-				break;
-			case ososDcTable2:
-				OJPEGWriteStreamDcTable(tif,2,mem,len);
-				break;
-			case ososDcTable3:
-				OJPEGWriteStreamDcTable(tif,3,mem,len);
-				break;
-			case ososAcTable0:
-				OJPEGWriteStreamAcTable(tif,0,mem,len);
-				break;
-			case ososAcTable1:
-				OJPEGWriteStreamAcTable(tif,1,mem,len);
-				break;
-			case ososAcTable2:
-				OJPEGWriteStreamAcTable(tif,2,mem,len);
-				break;
-			case ososAcTable3:
-				OJPEGWriteStreamAcTable(tif,3,mem,len);
-				break;
-			case ososDri:
-				OJPEGWriteStreamDri(tif,mem,len);
-				break;
-			case ososSof:
-				OJPEGWriteStreamSof(tif,mem,len);
-				break;
-			case ososSos:
-				OJPEGWriteStreamSos(tif,mem,len);
-				break;
-			case ososCompressed:
-				if (OJPEGWriteStreamCompressed(tif,mem,len)==0)
-					return(0);
-				break;
-			case ososRst:
-				OJPEGWriteStreamRst(tif,mem,len);
-				break;
-			case ososEoi:
-				OJPEGWriteStreamEoi(tif,mem,len);
-				break;
-		}
-	} while (*len==0);
-	return(1);
-}
+_notSupported(register TIFF *tif)
+  { const TIFFCodec *c = TIFFFindCODEC(tif->tif_dir.td_compression);
 
-static void
-OJPEGWriteStreamSoi(TIFF* tif, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	assert(OJPEG_BUFFER>=2);
-	sp->out_buffer[0]=255;
-	sp->out_buffer[1]=JPEG_MARKER_SOI;
-	*len=2;
-	*mem=(void*)sp->out_buffer;
-	sp->out_state++;
-}
-
-static void
-OJPEGWriteStreamQTable(TIFF* tif, uint8 table_index, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	if (sp->qtable[table_index]!=0)
-	{
-		*mem=(void*)(sp->qtable[table_index]+sizeof(uint32));
-		*len=*((uint32*)sp->qtable[table_index])-sizeof(uint32);
-	}
-	sp->out_state++;
-}
-
-static void
-OJPEGWriteStreamDcTable(TIFF* tif, uint8 table_index, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	if (sp->dctable[table_index]!=0)
-	{
-		*mem=(void*)(sp->dctable[table_index]+sizeof(uint32));
-		*len=*((uint32*)sp->dctable[table_index])-sizeof(uint32);
-	}
-	sp->out_state++;
-}
+    TIFFError(tif->tif_name,"%s compression not supported",c->name);
+    return 0;
+  }
+#endif /* never */
 
+/* The following subroutines comprise a JPEG Library "source" data manager by
+   by directing compressed data to the JPEG Library from a TIFF Library input
+   buffer.
+*/
 static void
-OJPEGWriteStreamAcTable(TIFF* tif, uint8 table_index, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	if (sp->actable[table_index]!=0)
-	{
-		*mem=(void*)(sp->actable[table_index]+sizeof(uint32));
-		*len=*((uint32*)sp->actable[table_index])-sizeof(uint32);
-	}
-	sp->out_state++;
-}
+std_init_source(register j_decompress_ptr cinfo)
+  {
+#   define sp ((OJPEGState *)cinfo)
+    register TIFF *tif = sp->tif;
+
+    if (sp->src.bytes_in_buffer == 0)
+      {
+        sp->src.next_input_byte = (const JOCTET *)tif->tif_rawdata;
+        sp->src.bytes_in_buffer = (size_t)tif->tif_rawcc;
+      };
+#   undef sp
+  }
 
-static void
-OJPEGWriteStreamDri(TIFF* tif, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	assert(OJPEG_BUFFER>=6);
-	if (sp->restart_interval!=0)
-	{
-		sp->out_buffer[0]=255;
-		sp->out_buffer[1]=JPEG_MARKER_DRI;
-		sp->out_buffer[2]=0;
-		sp->out_buffer[3]=4;
-		sp->out_buffer[4]=(sp->restart_interval>>8);
-		sp->out_buffer[5]=(sp->restart_interval&255);
-		*len=6;
-		*mem=(void*)sp->out_buffer;
-	}
-	sp->out_state++;
-}
+static boolean
+std_fill_input_buffer(register j_decompress_ptr cinfo)
+  { static const JOCTET dummy_EOI[2]={0xFF,JPEG_EOI};
+#   define sp ((OJPEGState *)cinfo)
 
-static void
-OJPEGWriteStreamSof(TIFF* tif, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8 m;
-	assert(OJPEG_BUFFER>=2+8+sp->samples_per_pixel_per_plane*3);
-	assert(255>=8+sp->samples_per_pixel_per_plane*3);
-	sp->out_buffer[0]=255;
-	sp->out_buffer[1]=sp->sof_marker_id;
-	/* Lf */
-	sp->out_buffer[2]=0;
-	sp->out_buffer[3]=8+sp->samples_per_pixel_per_plane*3;
-	/* P */
-	sp->out_buffer[4]=8;
-	/* Y */
-	sp->out_buffer[5]=(sp->sof_y>>8);
-	sp->out_buffer[6]=(sp->sof_y&255);
-	/* X */
-	sp->out_buffer[7]=(sp->sof_x>>8);
-	sp->out_buffer[8]=(sp->sof_x&255);
-	/* Nf */
-	sp->out_buffer[9]=sp->samples_per_pixel_per_plane;
-	for (m=0; m<sp->samples_per_pixel_per_plane; m++)
-	{
-		/* C */
-		sp->out_buffer[10+m*3]=sp->sof_c[sp->plane_sample_offset+m];
-		/* H and V */
-		sp->out_buffer[10+m*3+1]=sp->sof_hv[sp->plane_sample_offset+m];
-		/* Tq */
-		sp->out_buffer[10+m*3+2]=sp->sof_tq[sp->plane_sample_offset+m];
-	}
-	*len=10+sp->samples_per_pixel_per_plane*3;
-	*mem=(void*)sp->out_buffer;
-	sp->out_state++;
-}
+ /* Control should never get here, since an entire strip/tile is read into
+    memory before the decompressor is called; thus, data should have been
+    supplied by the "init_source" method.  ...But, sometimes things fail.
+ */
+    WARNMS(cinfo,JWRN_JPEG_EOF);
+    sp->src.next_input_byte = dummy_EOI; /* Insert a fake EOI marker */
+    sp->src.bytes_in_buffer = sizeof dummy_EOI;
+    return TRUE;
+#   undef sp
+  }
 
 static void
-OJPEGWriteStreamSos(TIFF* tif, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	uint8 m;
-	assert(OJPEG_BUFFER>=2+6+sp->samples_per_pixel_per_plane*2);
-	assert(255>=6+sp->samples_per_pixel_per_plane*2);
-	sp->out_buffer[0]=255;
-	sp->out_buffer[1]=JPEG_MARKER_SOS;
-	/* Ls */
-	sp->out_buffer[2]=0;
-	sp->out_buffer[3]=6+sp->samples_per_pixel_per_plane*2;
-	/* Ns */
-	sp->out_buffer[4]=sp->samples_per_pixel_per_plane;
-	for (m=0; m<sp->samples_per_pixel_per_plane; m++)
-	{
-		/* Cs */
-		sp->out_buffer[5+m*2]=sp->sos_cs[sp->plane_sample_offset+m];
-		/* Td and Ta */
-		sp->out_buffer[5+m*2+1]=sp->sos_tda[sp->plane_sample_offset+m];
-	}
-	/* Ss */
-	sp->out_buffer[5+sp->samples_per_pixel_per_plane*2]=0;
-	/* Se */
-	sp->out_buffer[5+sp->samples_per_pixel_per_plane*2+1]=63;
-	/* Ah and Al */
-	sp->out_buffer[5+sp->samples_per_pixel_per_plane*2+2]=0;
-	*len=8+sp->samples_per_pixel_per_plane*2;
-	*mem=(void*)sp->out_buffer;
-	sp->out_state++;
-}
-
+std_skip_input_data(register j_decompress_ptr cinfo, long num_bytes)
+  {
+#   define sp ((OJPEGState *)cinfo)
+
+    if (num_bytes > 0)
+    {
+      if (num_bytes > (long)sp->src.bytes_in_buffer) /* oops: buffer overrun */
+        (void)std_fill_input_buffer(cinfo);
+      else
+        {
+          sp->src.next_input_byte += (size_t)num_bytes;
+          sp->src.bytes_in_buffer -= (size_t)num_bytes;
+        }
+    }
+#   undef sp
+  }
+
+/*ARGSUSED*/ static void
+std_term_source(register j_decompress_ptr cinfo){} /* "Dummy" stub */
+
+/* Allocate temporary I/O buffers for downsampled data, using values computed in
+   "jpeg_start_{de}compress()".  We use the JPEG Library's allocator so that
+   buffers will be released automatically when done with a strip/tile.  This is
+   also a handy place to compute samplesperclump, bytesperline, etc.
+*/
 static int
-OJPEGWriteStreamCompressed(TIFF* tif, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	if (sp->in_buffer_togo==0)
-	{
-		if (OJPEGReadBufferFill(sp)==0)
-			return(0);
-		assert(sp->in_buffer_togo>0);
-	}
-	*len=sp->in_buffer_togo;
-	*mem=(void*)sp->in_buffer_cur;
-	sp->in_buffer_togo=0;
-	if (sp->in_buffer_file_togo==0)
-	{
-		switch(sp->in_buffer_source)
-		{
-			case osibsStrile:
-				if (sp->in_buffer_next_strile<sp->in_buffer_strile_count)  
-					sp->out_state=ososRst;
-				else
-					sp->out_state=ososEoi;
-				break;
-			case osibsEof:
-				sp->out_state=ososEoi;
-				break;
-			default:
-				break;
-		}
-	}
-	return(1);
-}
-
-static void
-OJPEGWriteStreamRst(TIFF* tif, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	assert(OJPEG_BUFFER>=2);
-	sp->out_buffer[0]=255;
-	sp->out_buffer[1]=JPEG_MARKER_RST0+sp->restart_index;
-	sp->restart_index++;
-	if (sp->restart_index==8)
-		sp->restart_index=0;
-	*len=2;
-	*mem=(void*)sp->out_buffer;
-	sp->out_state=ososCompressed;
-}
-
-static void
-OJPEGWriteStreamEoi(TIFF* tif, void** mem, uint32* len)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	assert(OJPEG_BUFFER>=2);
-	sp->out_buffer[0]=255;
-	sp->out_buffer[1]=JPEG_MARKER_EOI;
-	*len=2;
-	*mem=(void*)sp->out_buffer;
-}
+alloc_downsampled_buffers(TIFF *tif,jpeg_component_info *comp_info,
+                          int num_components)
+  { register OJPEGState *sp = OJState(tif);
+
+    sp->samplesperclump = 0;
+    if (num_components > 0)
+      { tsize_t size = sp->cinfo.comm.is_decompressor
+#                    ifdef D_LOSSLESS_SUPPORTED
+                     ? sp->cinfo.d.min_codec_data_unit
+#                    else
+                     ? DCTSIZE
+#                    endif
+#                    ifdef C_LOSSLESS_SUPPORTED
+                     : sp->cinfo.c.data_unit;
+#                    else
+                     : DCTSIZE;
+#                    endif
+        int ci = 0;
+        register jpeg_component_info *compptr = comp_info;
+
+        do
+          { JSAMPARRAY buf;
+
+            sp->samplesperclump +=
+              compptr->h_samp_factor * compptr->v_samp_factor;
+#           if defined(C_LOSSLESS_SUPPORTED) || defined(D_LOSSLESS_SUPPORTED)
+            if (!(buf = CALLJPEG(sp,0,(*sp->cinfo.comm.mem->alloc_sarray)(&sp->cinfo.comm,JPOOL_IMAGE,compptr->width_in_data_units*size,compptr->v_samp_factor*size))))
+#           else
+            if (!(buf = CALLJPEG(sp,0,(*sp->cinfo.comm.mem->alloc_sarray)(&sp->cinfo.comm,JPOOL_IMAGE,compptr->width_in_blocks*size,compptr->v_samp_factor*size))))
+#           endif
+              return 0;
+            sp->ds_buffer[ci] = buf;
+          }
+        while (++compptr,++ci < num_components);
+      };
+    return 1;
+  }
+#ifdef never
+
+/* JPEG Encoding begins here. */
+
+/*ARGSUSED*/ static int
+OJPEGEncode(register TIFF *tif,tidata_t buf,tsize_t cc,tsample_t s)
+  { tsize_t rows;                          /* No. of unprocessed rows in file */
+    register OJPEGState *sp = OJState(tif);
+
+ /* Encode a chunk of pixels, where returned data is NOT down-sampled (the
+    standard case).  The data is expected to be written in scan-line multiples.
+ */
+    if (cc % sp->bytesperline) TIFFWarning(tif->tif_name,no_write_frac);
+    if ( (cc /= bytesperline)      /* No. of complete rows in caller's buffer */
+       > (rows = sp->cinfo.c.image_height - sp->cinfo.c.next_scanline)
+       ) cc = rows;
+    while (--cc >= 0)
+      {
+        if (   CALLJPEG(sp,-1,jpeg_write_scanlines(&sp->cinfo.c,(JSAMPARRAY)&buf,1))
+            != 1
+           ) return 0;
+        ++tif->tif_row;
+        buf += sp->bytesperline;
+      };
+    return 1;
+  }
+
+/*ARGSUSED*/ static int
+OJPEGEncodeRaw(register TIFF *tif,tidata_t buf,tsize_t cc,tsample_t s)
+  { tsize_t rows;                          /* No. of unprocessed rows in file */
+    JDIMENSION lines_per_MCU, size;
+    register OJPEGState *sp = OJState(tif);
+
+ /* Encode a chunk of pixels, where returned data is down-sampled as per the
+    sampling factors.  The data is expected to be written in scan-line
+    multiples.
+ */
+    cc /= sp->bytesperline;
+    if (cc % sp->bytesperline) TIFFWarning(tif->tif_name,no_write_frac);
+    if ( (cc /= bytesperline)      /* No. of complete rows in caller's buffer */
+       > (rows = sp->cinfo.c.image_height - sp->cinfo.c.next_scanline)
+       ) cc = rows;
+#   ifdef C_LOSSLESS_SUPPORTED
+    lines_per_MCU = sp->cinfo.c.max_samp_factor*(size = sp->cinfo.d.data_unit);
+#   else
+    lines_per_MCU = sp->cinfo.c.max_samp_factor*(size = DCTSIZE);
+#   endif
+    while (--cc >= 0)
+      { int ci = 0, clumpoffset = 0;
+        register jpeg_component_info *compptr = sp->cinfo.c.comp_info;
+
+     /* The fastest way to separate the data is to make 1 pass over the scan
+        line for each row of each component.
+     */
+        do
+          { int ypos = 0;
+
+            do
+              { int padding;
+                register JSAMPLE *inptr = (JSAMPLE*)buf + clumpoffset,
+                                 *outptr =
+                  sp->ds_buffer[ci][sp->scancount*compptr->v_samp_factor+ypos];
+             /* Cb,Cr both have sampling factors 1, so this is correct */
+                register int clumps_per_line =
+                  sp->cinfo.c.comp_info[1].downsampled_width,
+                             xpos;
+
+                padding = (int)
+#                         ifdef C_LOSSLESS_SUPPORTED
+                          ( compptr->width_in_data_units * size
+#                         else
+                          ( compptr->width_in_blocks * size
+#                         endif
+                          - clumps_per_line * compptr->h_samp_factor
+                          );
+                if (compptr->h_samp_factor == 1) /* Cb & Cr fast path */
+                  do *outptr++ = *inptr;
+                  while ((inptr += sp->samplesperclump),--clumps_per_line > 0);
+                else /* general case */
+                  do
+                    {
+                      xpos = 0;
+                      do *outptr++ = inptr[xpos];
+                      while (++xpos < compptr->h_samp_factor);
+                    }
+                  while ((inptr += sp->samplesperclump),--clumps_per_line > 0);
+                xpos = 0; /* Pad each scan line as needed */
+                do outptr[0] = outptr[-1]; while (++outptr,++xpos < padding);
+                clumpoffset += compptr->h_samp_factor;
+              }
+            while (++ypos < compptr->v_samp_factor);
+          }
+        while (++compptr,++ci < sp->cinfo.c.num_components);
+        if (++sp->scancount >= size)
+          {
+            if (   CALLJPEG(sp,-1,jpeg_write_raw_data(&sp->cinfo.c,sp->ds_buffer,lines_per_MCU))
+                != lines_per_MCU
+               ) return 0;
+            sp->scancount = 0;
+          };
+        ++tif->tif_row++
+        buf += sp->bytesperline;
+      };
+    return 1;
+  }
 
-#ifndef LIBJPEG_ENCAP_EXTERNAL
 static int
-jpeg_create_decompress_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo)
-{
-	return(SETJMP(sp->exit_jmpbuf)?0:(jpeg_create_decompress(cinfo),1));
-}
-#endif
+OJPEGSetupEncode(register TIFF *tif)
+  { static const char module[]={"OJPEGSetupEncode"};
+    uint32 segment_height, segment_width;
+    int status = 1;                              /* Assume success by default */
+    register OJPEGState *sp = OJState(tif);
+#   define td (&tif->tif_dir)
+
+ /* Verify miscellaneous parameters.  This will need work if the TIFF Library
+    ever supports different depths for different components, or if the JPEG
+    Library ever supports run-time depth selection.  Neither seems imminent.
+ */
+    if (td->td_bitspersample != 8)
+      {
+        TIFFError(module,bad_bps,td->td_bitspersample);
+        status = 0;
+      };
+
+ /* The TIFF Version 6.0 specification and IJG JPEG Library accept different
+    sets of color spaces, so verify that our image belongs to the common subset
+    and map its photometry code, then initialize to handle subsampling and
+    optional JPEG Library YCbCr <-> RGB color-space conversion.
+ */
+    switch (td->td_photometric)
+      {
+        case PHOTOMETRIC_YCBCR     :
+
+       /* ISO IS 10918-1 requires that JPEG subsampling factors be 1-4, but
+          TIFF Version 6.0 is more restrictive: only 1, 2, and 4 are allowed.
+       */
+          if (   (   td->td_ycbcrsubsampling[0] == 1
+                  || td->td_ycbcrsubsampling[0] == 2
+                  || td->td_ycbcrsubsampling[0] == 4
+                 )
+              && (   td->td_ycbcrsubsampling[1] == 1
+                  || td->td_ycbcrsubsampling[1] == 2
+                  || td->td_ycbcrsubsampling[1] == 4
+                 )
+             )
+            sp->cinfo.c.raw_data_in =
+              ( (sp->h_sampling = td->td_ycbcrsubsampling[0]) << 3
+              | (sp->v_sampling = td->td_ycbcrsubsampling[1])
+              ) != 011;
+          else
+            {
+              TIFFError(module,bad_subsampling);
+              status = 0;
+            };
+
+       /* A ReferenceBlackWhite field MUST be present, since the default value
+          is inapproriate for YCbCr.  Fill in the proper value if the
+          application didn't set it.
+       */
+          if (!TIFFFieldSet(tif,FIELD_REFBLACKWHITE))
+            { float refbw[6];
+              long top = 1L << td->td_bitspersample;
+ 
+              refbw[0] = 0;
+              refbw[1] = (float)(top-1L);
+              refbw[2] = (float)(top>>1);
+              refbw[3] = refbw[1];
+              refbw[4] = refbw[2];
+              refbw[5] = refbw[1];
+              TIFFSetField(tif,TIFFTAG_REFERENCEBLACKWHITE,refbw);
+            };
+          sp->cinfo.c.jpeg_color_space = JCS_YCbCr;
+          if (sp->jpegcolormode == JPEGCOLORMODE_RGB)
+            {
+              sp->cinfo.c.raw_data_in = FALSE;
+              sp->in_color_space = JCS_RGB;
+              break;
+            };
+          goto L2;
+        case PHOTOMETRIC_MINISBLACK:
+          sp->cinfo.c.jpeg_color_space = JCS_GRAYSCALE;
+          goto L1;
+        case PHOTOMETRIC_RGB       :
+          sp->cinfo.c.jpeg_color_space = JCS_RGB;
+          goto L1;
+        case PHOTOMETRIC_SEPARATED :
+          sp->cinfo.c.jpeg_color_space = JCS_CMYK;
+      L1: sp->jpegcolormode = JPEGCOLORMODE_RAW; /* No JPEG Lib. conversion */
+      L2: sp->cinfo.d.in_color_space = sp->cinfo.d.jpeg_color-space;
+          break;
+        default                    :
+          TIFFError(module,bad_photometry,td->td_photometric);
+          status = 0;
+      };
+    tif->tif_encoderow = tif->tif_encodestrip = tif->tif_encodetile =
+      sp->cinfo.c.raw_data_in ? OJPEGEncodeRaw : OJPEGEncode;
+    if (isTiled(tif))
+      { tsize_t size;
+
+#       ifdef C_LOSSLESS_SUPPORTED
+        if ((size = sp->v_sampling*sp->cinfo.c.data_unit) < 16) size = 16;
+#       else
+        if ((size = sp->v_sampling*DCTSIZE) < 16) size = 16;
+#       endif
+        if ((segment_height = td->td_tilelength) % size)
+          {
+            TIFFError(module,"JPEG tile height must be multiple of %d",size);
+            status = 0;
+          };
+#       ifdef C_LOSSLESS_SUPPORTED
+        if ((size = sp->h_sampling*sp->cinfo.c.data_unit) < 16) size = 16;
+#       else
+        if ((size = sp->h_sampling*DCTSIZE) < 16) size = 16;
+#       endif
+        if ((segment_width = td->td_tilewidth) % size)
+          {
+            TIFFError(module,"JPEG tile width must be multiple of %d",size);
+            status = 0;
+          };
+        sp->bytesperline = TIFFTileRowSize(tif);
+      }
+    else
+      { tsize_t size;
+
+#       ifdef C_LOSSLESS_SUPPORTED
+        if ((size = sp->v_sampling*sp->cinfo.c.data_unit) < 16) size = 16;
+#       else
+        if ((size = sp->v_sampling*DCTSIZE) < 16) size = 16;
+#       endif
+        if (td->td_rowsperstrip < (segment_height = td->td_imagelength))
+          {
+            if (td->td_rowsperstrip % size)
+              {
+                TIFFError(module,"JPEG RowsPerStrip must be multiple of %d",size);
+                status = 0;
+              };
+            segment_height = td->td_rowsperstrip;
+          };
+        segment_width = td->td_imagewidth;
+        sp->bytesperline = tif->tif_scanlinesize;
+      };
+    if (segment_width > 65535 || segment_height > 65535)
+      {
+        TIFFError(module,"Strip/tile too large for JPEG");
+        status = 0;
+      };
+
+ /* Initialize all JPEG parameters to default values.  Note that the JPEG
+    Library's "jpeg_set_defaults()" method needs legal values for the
+    "in_color_space" and "input_components" fields.
+ */
+    sp->cinfo.c.input_components = 1; /* Default for JCS_UNKNOWN */
+    if (!CALLVJPEG(sp,jpeg_set_defaults(&sp->cinfo.c))) status = 0;
+    switch (sp->jpegtablesmode & (JPEGTABLESMODE_HUFF|JPEGTABLESMODE_QUANT))
+      { register JHUFF_TBL *htbl;
+        register JQUANT_TBL *qtbl;
+
+        case 0                                       :
+          sp->cinfo.c.optimize_coding = TRUE;
+        case JPEGTABLESMODE_HUFF                     :
+          if (!CALLVJPEG(sp,jpeg_set_quality(&sp->cinfo.c,sp->jpegquality,FALSE)))
+            return 0;
+          if (qtbl = sp->cinfo.c.quant_tbl_ptrs[0]) qtbl->sent_table = FALSE;
+          if (qtbl = sp->cinfo.c.quant_tbl_ptrs[1]) qtbl->sent_table = FALSE;
+          goto L3;
+        case JPEGTABLESMODE_QUANT                    :
+          sp->cinfo.c.optimize_coding = TRUE;
+
+       /* We do not support application-supplied JPEG tables, so mark the field
+          "not present".
+       */
+      L3: TIFFClrFieldBit(tif,FIELD_JPEGTABLES);
+          break;
+        case JPEGTABLESMODE_HUFF|JPEGTABLESMODE_QUANT:
+          if (   !CALLVJPEG(sp,jpeg_set_quality(&sp->cinfo.c,sp->jpegquality,FALSE))
+              || !CALLVJPEG(sp,jpeg_suppress_tables(&sp->cinfo.c,TRUE))
+             )
+            {
+              status = 0;
+              break;
+            };
+          if (qtbl = sp->cinfo.c.quant_tbl_ptrs[0]) qtbl->sent_table = FALSE;
+          if (htbl = sp->cinfo.c.dc_huff_tbl_ptrs[0]) htbl->sent_table = FALSE;
+          if (htbl = sp->cinfo.c.ac_huff_tbl_ptrs[0]) htbl->sent_table = FALSE;
+          if (sp->cinfo.c.jpeg_color_space == JCS_YCbCr)
+            {
+              if (qtbl = sp->cinfo.c.quant_tbl_ptrs[1])
+                qtbl->sent_table = FALSE;
+              if (htbl = sp->cinfo.c.dc_huff_tbl_ptrs[1])
+                htbl->sent_table = FALSE;
+              if (htbl = sp->cinfo.c.ac_huff_tbl_ptrs[1])
+                htbl->sent_table = FALSE;
+            };
+          if (   TIFFojpeg_tables_dest(sp,tif)
+              && CALLVJPEG(sp,jpeg_write_tables(&sp->cinfo.c))
+             )
+            {
+    
+           /* Mark the field "present".  We can't use "TIFFSetField()" because
+              "BEENWRITING" is already set!
+           */
+              TIFFSetFieldBit(tif,FIELD_JPEGTABLES);
+              tif->tif_flags |= TIFF_DIRTYDIRECT;
+            }
+          else status = 0;
+      };
+    if (   sp->cinfo.c.raw_data_in
+        && !alloc_downsampled_buffers(tif,sp->cinfo.c.comp_info,
+                                      sp->cinfo.c.num_components)
+       ) status = 0;
+    if (status == 0) return 0; /* If TIFF errors, don't bother to continue */
+ /* Grab parameters that are same for all strips/tiles. */
+
+    sp->dest.init_destination = std_init_destination;
+    sp->dest.empty_output_buffer = std_empty_output_buffer;
+    sp->dest.term_destination = std_term_destination;
+    sp->cinfo.c.dest = &sp->dest;
+    sp->cinfo.c.data_precision = td->td_bitspersample;
+    sp->cinfo.c.write_JFIF_header = /* Don't write extraneous markers */
+    sp->cinfo.c.write_Adobe_marker = FALSE;
+    sp->cinfo.c.image_width = segment_width;
+    sp->cinfo.c.image_height = segment_height;
+    sp->cinfo.c.comp_info[0].h_samp_factor =
+    sp->cinfo.c.comp_info[0].v_samp_factor = 1;
+    return CALLVJPEG(sp,jpeg_start_compress(&sp->cinfo.c,FALSE));
+#   undef td
+  }
 
-#ifndef LIBJPEG_ENCAP_EXTERNAL
 static int
-jpeg_read_header_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo, uint8 require_image)
-{
-	return(SETJMP(sp->exit_jmpbuf)?0:(jpeg_read_header(cinfo,require_image),1));
-}
-#endif
+OJPEGPreEncode(register TIFF *tif,tsample_t s)
+  { register OJPEGState *sp = OJState(tif);
+#   define td (&tif->tif_dir)
+
+ /* If we are about to write the first row of an image plane, which should
+    coincide with a JPEG "scan", reset the JPEG Library's compressor.  Otherwise
+    let the compressor run "as is" and return a "success" status without further
+    ado.
+ */
+    if (     (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip)
+           % td->td_stripsperimage
+        == 0
+       )
+      {
+        if (   (sp->cinfo.c.comp_info[0].component_id = s) == 1)
+            && sp->cinfo.c.jpeg_color_space == JCS_YCbCr
+           )
+          {
+            sp->cinfo.c.comp_info[0].quant_tbl_no =
+            sp->cinfo.c.comp_info[0].dc_tbl_no =
+            sp->cinfo.c.comp_info[0].ac_tbl_no = 1;
+            sp->cinfo.c.comp_info[0].h_samp_factor = sp->h_sampling;
+            sp->cinfo.c.comp_info[0].v_samp_factor = sp->v_sampling;
+    
+         /* Scale expected strip/tile size to match a downsampled component. */
+    
+            sp->cinfo.c.image_width = TIFFhowmany(segment_width,sp->h_sampling);
+            sp->cinfo.c.image_height=TIFFhowmany(segment_height,sp->v_sampling);
+          };
+        sp->scancount = 0; /* Mark subsampling buffer(s) empty */
+      };
+    return 1;
+#   undef td
+  }
 
-#ifndef LIBJPEG_ENCAP_EXTERNAL
 static int
-jpeg_start_decompress_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo)
-{
-	return(SETJMP(sp->exit_jmpbuf)?0:(jpeg_start_decompress(cinfo),1));
-}
-#endif
+OJPEGPostEncode(register TIFF *tif)
+  { register OJPEGState *sp = OJState(tif);
+
+ /* Finish up at the end of a strip or tile. */
+
+    if (sp->scancount > 0) /* emit partial buffer of down-sampled data */
+      { JDIMENSION n;
+
+#       ifdef C_LOSSLESS_SUPPORTED
+        if (   sp->scancount < sp->cinfo.c.data_unit
+            && sp->cinfo.c.num_components > 0
+           )
+#       else
+        if (sp->scancount < DCTSIZE && sp->cinfo.c.num_components > 0)
+#       endif
+          { int ci = 0,                            /* Pad the data vertically */
+#           ifdef C_LOSSLESS_SUPPORTED
+                size = sp->cinfo.c.data_unit;
+#           else
+                size = DCTSIZE;
+#           endif
+            register jpeg_component_info *compptr = sp->cinfo.c.comp_info;
+
+            do
+#              ifdef C_LOSSLESS_SUPPORTED
+               { tsize_t row_width = compptr->width_in_data_units
+#              else
+                 tsize_t row_width = compptr->width_in_blocks
+#              endif
+                   *size*sizeof(JSAMPLE);
+                 int ypos = sp->scancount*compptr->v_samp_factor;
+
+                 do _TIFFmemcpy( (tdata_t)sp->ds_buffer[ci][ypos]
+                               , (tdata_t)sp->ds_buffer[ci][ypos-1]
+                               , row_width
+                               );
+                 while (++ypos < compptr->v_samp_factor*size);
+               }
+            while (++compptr,++ci < sp->cinfo.c.num_components);
+          };
+        n = sp->cinfo.c.max_v_samp_factor*size;
+        if (CALLJPEG(sp,-1,jpeg_write_raw_data(&sp->cinfo.c,sp->ds_buffer,n)) != n)
+          return 0;
+      };
+    return CALLVJPEG(sp,jpeg_finish_compress(&sp->cinfo.c));
+  }
+#endif /* never */
+
+/* JPEG Decoding begins here. */
+
+/*ARGSUSED*/ static int
+OJPEGDecode(register TIFF *tif,tidata_t buf,tsize_t cc,tsample_t s)
+  { tsize_t bytesperline = isTiled(tif)
+                         ? TIFFTileRowSize(tif)
+                         : tif->tif_scanlinesize,
+            rows;                          /* No. of unprocessed rows in file */
+    register OJPEGState *sp = OJState(tif);
+
+ /* Decode a chunk of pixels, where the input data has not NOT been down-
+    sampled, or else the TIFF Library's client has used the "JPEGColorMode" TIFF
+    pseudo-tag to request that the JPEG Library do color-space conversion; this
+    is the normal case.  The data is expected to be read in scan-line multiples,
+    and this subroutine is called for both pixel-interleaved and separate color
+    planes.
+
+    WARNING:  Unlike "OJPEGDecodeRawContig()", below, the no. of Bytes in each
+              decoded row is calculated here as "bytesperline" instead of
+    using "sp->bytesperline", which might be a little smaller.  This can
+    occur for an old tiled image whose width isn't a multiple of 8 pixels.
+    That's illegal according to the TIFF Version 6 specification, but some
+    test files, like "zackthecat.tif", were built that way.  In those cases,
+    we want to embed the image's true width in our caller's buffer (which is
+    presumably allocated according to the expected tile width) by
+    effectively "padding" it with unused Bytes at the end of each row.
+ */
+    if ( (cc /= bytesperline)      /* No. of complete rows in caller's buffer */
+       > (rows = sp->cinfo.d.output_height - sp->cinfo.d.output_scanline)
+       ) cc = rows;
+    while (--cc >= 0)
+      {
+        if (   CALLJPEG(sp,-1,jpeg_read_scanlines(&sp->cinfo.d,(JSAMPARRAY)&buf,1))
+            != 1
+           ) return 0;
+        buf += bytesperline;
+        ++tif->tif_row;
+      };
+
+ /* BEWARE OF KLUDGE:  If our input file was produced by Microsoft's Wang
+                       Imaging for Windows application, the DC coefficients of
+    each JPEG image component (Y,Cb,Cr) must be reset at the end of each TIFF
+    "strip", and any JPEG data bits remaining in the current Byte of the
+    decoder's input buffer must be discarded.  To do so, we create an "ad hoc"
+    interface in the "jdhuff.c" module of IJG JPEG Library Version 6 (module
+    "jdshuff.c", if Ken Murchison's lossless-Huffman patch is applied), and we
+    invoke that interface here after decoding each "strip".
+ */
+    if (sp->is_WANG) jpeg_reset_huff_decode(&sp->cinfo.d);
+    return 1;
+  }
+
+/*ARGSUSED*/ static int
+OJPEGDecodeRawContig(register TIFF *tif,tidata_t buf,tsize_t cc,tsample_t s)
+  { tsize_t rows;                          /* No. of unprocessed rows in file */
+    JDIMENSION lines_per_MCU, size;
+    register OJPEGState *sp = OJState(tif);
+
+ /* Decode a chunk of pixels, where the input data has pixel-interleaved color
+    planes, some of which have been down-sampled, but the TIFF Library's client
+    has NOT used the "JPEGColorMode" TIFF pseudo-tag to request that the JPEG
+    Library do color-space conversion.  In other words, we must up-sample/
+    expand/duplicate image components according to the image's sampling factors,
+    without changing its color space.  The data is expected to be read in scan-
+    line multiples.
+ */
+    if ( (cc /= sp->bytesperline)  /* No. of complete rows in caller's buffer */
+       > (rows = sp->cinfo.d.output_height - sp->cinfo.d.output_scanline)
+       ) cc = rows;
+    lines_per_MCU = sp->cinfo.d.max_v_samp_factor
+#   ifdef D_LOSSLESS_SUPPORTED
+                  * (size = sp->cinfo.d.min_codec_data_unit);
+#   else
+                  * (size = DCTSIZE);
+#   endif
+    while (--cc >= 0)
+      { int clumpoffset, ci;
+        register jpeg_component_info *compptr;
+
+        if (sp->scancount >= size) /* reload downsampled-data buffers */
+          {
+            if (   CALLJPEG(sp,-1,jpeg_read_raw_data(&sp->cinfo.d,sp->ds_buffer,lines_per_MCU))
+                != lines_per_MCU
+               ) return 0;
+            sp->scancount = 0;
+          };
+
+     /* The fastest way to separate the data is: make 1 pass over the scan
+        line for each row of each component.
+     */
+        clumpoffset = ci = 0;
+        compptr = sp->cinfo.d.comp_info;
+        do
+          { int ypos = 0;
+
+            if (compptr->h_samp_factor == 1) /* fast path */
+              do
+                { register JSAMPLE *inptr =
+                    sp->ds_buffer[ci][sp->scancount*compptr->v_samp_factor+ypos],
+                                   *outptr = (JSAMPLE *)buf + clumpoffset;
+                  register int clumps_per_line = compptr->downsampled_width;
+
+                  do *outptr = *inptr++;
+                  while ((outptr += sp->samplesperclump),--clumps_per_line > 0);
+                }
+              while ( (clumpoffset += compptr->h_samp_factor)
+                    , ++ypos < compptr->v_samp_factor
+                    );
+            else /* general case */
+              do
+                { register JSAMPLE *inptr =
+                    sp->ds_buffer[ci][sp->scancount*compptr->v_samp_factor+ypos],
+                                   *outptr = (JSAMPLE *)buf + clumpoffset;
+                  register int clumps_per_line = compptr->downsampled_width;
+
+                  do
+                    { register int xpos = 0;
+
+                      do outptr[xpos] = *inptr++;
+                      while (++xpos < compptr->h_samp_factor);
+                    }
+                  while ((outptr += sp->samplesperclump),--clumps_per_line > 0);
+                }
+              while ( (clumpoffset += compptr->h_samp_factor)
+                    , ++ypos < compptr->v_samp_factor
+                    );
+          }
+        while (++compptr,++ci < sp->cinfo.d.num_components);
+        ++sp->scancount;
+        buf += sp->bytesperline;
+        ++tif->tif_row;
+      };
+
+ /* BEWARE OF KLUDGE:  If our input file was produced by Microsoft's Wang
+                       Imaging for Windows application, the DC coefficients of
+    each JPEG image component (Y,Cb,Cr) must be reset at the end of each TIFF
+    "strip", and any JPEG data bits remaining in the current Byte of the
+    decoder's input buffer must be discarded.  To do so, we create an "ad hoc"
+    interface in the "jdhuff.c" module of IJG JPEG Library Version 6 (module
+    "jdshuff.c", if Ken Murchison's lossless-Huffman patch is applied), and we
+    invoke that interface here after decoding each "strip".
+ */
+    if (sp->is_WANG) jpeg_reset_huff_decode(&sp->cinfo.d);
+    return 1;
+  }
+
+/*ARGSUSED*/ static int
+OJPEGDecodeRawSeparate(TIFF *tif,register tidata_t buf,tsize_t cc,tsample_t s)
+  { tsize_t rows;                          /* No. of unprocessed rows in file */
+    JDIMENSION lines_per_MCU,
+               size,                                             /* ...of MCU */
+               v;                   /* Component's vertical up-sampling ratio */
+    register OJPEGState *sp = OJState(tif);
+    register jpeg_component_info *compptr = sp->cinfo.d.comp_info + s;
+
+ /* Decode a chunk of pixels, where the input data has separate color planes,
+    some of which have been down-sampled, but the TIFF Library's client has NOT
+    used the "JPEGColorMode" TIFF pseudo-tag to request that the JPEG Library
+    do color-space conversion.  The data is expected to be read in scan-line
+    multiples.
+ */
+    v = sp->cinfo.d.max_v_samp_factor/compptr->v_samp_factor;
+    if ( (cc /= compptr->downsampled_width) /* No. of rows in caller's buffer */
+       > (rows = (sp->cinfo.d.output_height-sp->cinfo.d.output_scanline+v-1)/v)
+       ) cc = rows; /* No. of rows of "clumps" to read */
+    lines_per_MCU = sp->cinfo.d.max_v_samp_factor
+#   ifdef D_LOSSLESS_SUPPORTED
+                  * (size = sp->cinfo.d.min_codec_data_unit);
+#   else
+                  * (size = DCTSIZE);
+#   endif
+ L: if (sp->scancount >= size) /* reload downsampled-data buffers */
+      {
+        if (   CALLJPEG(sp,-1,jpeg_read_raw_data(&sp->cinfo.d,sp->ds_buffer,lines_per_MCU))
+            != lines_per_MCU
+           ) return 0;
+        sp->scancount = 0;
+      };
+    rows = 0;
+    do
+      { register JSAMPLE *inptr =
+          sp->ds_buffer[s][sp->scancount*compptr->v_samp_factor + rows];
+        register int clumps_per_line = compptr->downsampled_width;
+
+        do *buf++ = *inptr++; while (--clumps_per_line > 0); /* Copy scanline */
+        tif->tif_row += v;
+        if (--cc <= 0) return 1; /* End of caller's buffer? */
+      }
+    while (++rows < compptr->v_samp_factor);
+    ++sp->scancount;
+    goto L;
+  }
+
+/* "OJPEGSetupDecode()" temporarily forces the JPEG Library to use the following
+   subroutine as a "dummy" input reader in order to fool the library into
+   thinking that it has read the image's first "Start of Scan" (SOS) marker, so
+   that it initializes accordingly.
+*/
+/*ARGSUSED*/ METHODDEF(int)
+fake_SOS_marker(j_decompress_ptr cinfo){return JPEG_REACHED_SOS;}
+
+/*ARGSUSED*/ METHODDEF(int)
+suspend(j_decompress_ptr cinfo){return JPEG_SUSPENDED;}
+
+/* The JPEG Library's "null" color-space converter actually re-packs separate
+   color planes (it's native image representation) into a pixel-interleaved,
+   contiguous plane.  But if our TIFF Library client is tryng to process a
+   PLANARCONFIG_SEPARATE image, we don't want that; so here are modifications of
+   code in the JPEG Library's "jdcolor.c" file, which simply copy Bytes to a
+   color plane specified by the current JPEG "scan".
+*/
+METHODDEF(void)
+ycc_rgb_convert(register j_decompress_ptr cinfo,JSAMPIMAGE in,JDIMENSION row,
+                register JSAMPARRAY out,register int nrows)
+  { typedef struct                /* "jdcolor.c" color-space conversion state */
+      {
+
+     /* WARNING:  This declaration is ugly and dangerous!  It's supposed to be
+                  private to the JPEG Library's "jdcolor.c" module, but we also
+        need it here.  Since the library's copy might change without notice, be
+        sure to keep this one synchronized or the following code will break!
+     */
+        struct jpeg_color_deconverter pub; /* Public fields */
+     /* Private state for YCC->RGB conversion */
+        int *Cr_r_tab,   /* ->Cr to R conversion table */
+            *Cb_b_tab;   /* ->Cb to B conversion table */
+        INT32 *Cr_g_tab, /* ->Cr to G conversion table */
+              *Cb_g_tab; /* ->Cb to G conversion table */
+      } *my_cconvert_ptr;
+    my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
+    JSAMPARRAY irow0p = in[0] + row;
+    register JSAMPLE *range_limit = cinfo->sample_range_limit;
+    register JSAMPROW outp, Y;
+
+    switch (cinfo->output_scan_number - 1)
+      { JSAMPARRAY irow1p, irow2p;
+        register INT32 *table0, *table1;
+        SHIFT_TEMPS
+
+        case RGB_RED  : irow2p = in[2] + row;
+                        table0 = (INT32 *)cconvert->Cr_r_tab;
+                        while (--nrows >= 0)
+                          { register JSAMPROW Cr = *irow2p++;
+                             register int i = cinfo->output_width;
+
+                             Y = *irow0p++;
+                             outp = *out++;
+                             while (--i >= 0)
+                               *outp++ = range_limit[*Y++ + table0[*Cr++]];
+                          };
+                        return;
+        case RGB_GREEN: irow1p = in[1] + row;
+                        irow2p = in[2] + row;
+                        table0 = cconvert->Cb_g_tab;
+                        table1 = cconvert->Cr_g_tab;
+                        while (--nrows >= 0)
+                          { register JSAMPROW Cb = *irow1p++,
+                                              Cr = *irow2p++;
+                             register int i = cinfo->output_width;
+
+                             Y = *irow0p++;
+                             outp = *out++;
+                             while (--i >= 0)
+                               *outp++ =
+                                 range_limit[ *Y++
+                                            + RIGHT_SHIFT(table0[*Cb++]+table1[*Cr++],16)
+                                            ];
+                          };
+                        return;
+        case RGB_BLUE : irow1p = in[1] + row;
+                        table0 = (INT32 *)cconvert->Cb_b_tab;
+                        while (--nrows >= 0)
+                          { register JSAMPROW Cb = *irow1p++;
+                             register int i = cinfo->output_width;
+
+                             Y = *irow0p++;
+                             outp = *out++;
+                             while (--i >= 0)
+                               *outp++ = range_limit[*Y++ + table0[*Cb++]];
+                          }
+      }
+  }
+
+METHODDEF(void)
+null_convert(register j_decompress_ptr cinfo,JSAMPIMAGE in,JDIMENSION row,
+             register JSAMPARRAY out,register int nrows)
+  { register JSAMPARRAY irowp = in[cinfo->output_scan_number - 1] + row;
+
+    while (--nrows >= 0) _TIFFmemcpy(*out++,*irowp++,cinfo->output_width);
+  }
 
-#ifndef LIBJPEG_ENCAP_EXTERNAL
 static int
-jpeg_read_scanlines_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo, void* scanlines, uint32 max_lines)
-{
-	return(SETJMP(sp->exit_jmpbuf)?0:(jpeg_read_scanlines(cinfo,scanlines,max_lines),1));
-}
-#endif
+OJPEGSetupDecode(register TIFF *tif)
+  { static char module[]={"OJPEGSetupDecode"};
+    J_COLOR_SPACE jpeg_color_space,   /* Color space of JPEG-compressed image */
+                  out_color_space;       /* Color space of decompressed image */
+    uint32 segment_width;
+    int status = 1;                              /* Assume success by default */
+    boolean downsampled_output=FALSE, /* <=> Want JPEG Library's "raw" image? */
+            is_JFIF;                                       /* <=> JFIF image? */
+    register OJPEGState *sp = OJState(tif);
+#   define td (&tif->tif_dir)
+
+ /* Verify miscellaneous parameters.  This will need work if the TIFF Library
+    ever supports different depths for different components, or if the JPEG
+    Library ever supports run-time depth selection.  Neither seems imminent.
+ */
+    if (td->td_bitspersample != sp->cinfo.d.data_precision)
+      {
+        TIFFError(module,bad_bps,td->td_bitspersample);
+        status = 0;
+      };
+
+ /* The TIFF Version 6.0 specification and IJG JPEG Library accept different
+    sets of color spaces, so verify that our image belongs to the common subset
+    and map its photometry code, then initialize to handle subsampling and
+    optional JPEG Library YCbCr <-> RGB color-space conversion.
+ */
+    switch (td->td_photometric)
+      {
+        case PHOTOMETRIC_YCBCR     :
+
+       /* ISO IS 10918-1 requires that JPEG subsampling factors be 1-4, but
+          TIFF Version 6.0 is more restrictive: only 1, 2, and 4 are allowed.
+       */
+          if (   (   td->td_ycbcrsubsampling[0] == 1
+                  || td->td_ycbcrsubsampling[0] == 2
+                  || td->td_ycbcrsubsampling[0] == 4
+                 )
+              && (   td->td_ycbcrsubsampling[1] == 1
+                  || td->td_ycbcrsubsampling[1] == 2
+                  || td->td_ycbcrsubsampling[1] == 4
+                 )
+             )
+            downsampled_output =
+              (
+                (sp->h_sampling = td->td_ycbcrsubsampling[0]) << 3
+              | (sp->v_sampling = td->td_ycbcrsubsampling[1])
+              ) != 011;
+          else
+            {
+              TIFFError(module,bad_subsampling);
+              status = 0;
+            };
+          jpeg_color_space = JCS_YCbCr;
+          if (sp->jpegcolormode == JPEGCOLORMODE_RGB)
+            {
+              downsampled_output = FALSE;
+              out_color_space = JCS_RGB;
+              break;
+            };
+          goto L2;
+        case PHOTOMETRIC_MINISBLACK:
+          jpeg_color_space = JCS_GRAYSCALE;
+          goto L1;
+        case PHOTOMETRIC_RGB       :
+          jpeg_color_space = JCS_RGB;
+          goto L1;
+        case PHOTOMETRIC_SEPARATED :
+          jpeg_color_space = JCS_CMYK;
+      L1: sp->jpegcolormode = JPEGCOLORMODE_RAW; /* No JPEG Lib. conversion */
+      L2: out_color_space = jpeg_color_space;
+          break;
+        default                    :
+          TIFFError(module,bad_photometry,td->td_photometric);
+          status = 0;
+      };
+    if (status == 0) return 0; /* If TIFF errors, don't bother to continue */
+
+ /* Set parameters that are same for all strips/tiles. */
+
+    sp->cinfo.d.src = &sp->src;
+    sp->src.init_source = std_init_source;
+    sp->src.fill_input_buffer = std_fill_input_buffer;
+    sp->src.skip_input_data = std_skip_input_data;
+    sp->src.resync_to_restart = jpeg_resync_to_restart;
+    sp->src.term_source = std_term_source;
+
+ /* BOGOSITY ALERT!  The Wang Imaging application for Microsoft Windows produces
+                     images containing "JPEGInterchangeFormat[Length]" TIFF
+    records that resemble JFIF-in-TIFF encapsulations but, in fact, violate the
+    TIFF Version 6 specification in several ways; nevertheless, we try to handle
+    them gracefully because there are apparently a lot of them around.  The
+    purported "JFIF" data stream in one of these files vaguely resembles a JPEG
+    "tables only" data stream, except that there's no trailing EOI marker.  The
+    rest of the JPEG data stream lies in a discontiguous file region, identified
+    by the 0th Strip offset (which is *also* illegal!), where it begins with an
+    SOS marker and apparently continues to the end of the file.  There is no
+    trailing EOI marker here, either.
+ */
+    is_JFIF = !sp->is_WANG && TIFFFieldSet(tif,FIELD_JPEGIFOFFSET);
 
-#ifndef LIBJPEG_ENCAP_EXTERNAL
-static int
-jpeg_read_raw_data_encap(OJPEGState* sp, jpeg_decompress_struct* cinfo, void* data, uint32 max_lines)
-{
-	return(SETJMP(sp->exit_jmpbuf)?0:(jpeg_read_raw_data(cinfo,data,max_lines),1));
-}
-#endif
+ /* Initialize decompression parameters that won't be overridden by JPEG Library
+    defaults set during the "jpeg_read_header()" call, below.
+ */
+    segment_width = td->td_imagewidth;
+    if (isTiled(tif))
+      {
+        if (sp->is_WANG) /* we don't know how to handle it */
+          {
+            TIFFError(module,"Tiled Wang image not supported");
+            return 0;
+          };
+
+     /* BOGOSITY ALERT!  "TIFFTileRowSize()" seems to work fine for modern JPEG-
+                         in-TIFF encapsulations where the image width--like the
+        tile width--is a multiple of 8 or 16 pixels.  But image widths and
+        heights are aren't restricted to 8- or 16-bit multiples, and we need
+        the exact Byte count of decompressed scan lines when we call the JPEG
+        Library.  At least one old file ("zackthecat.tif") in the TIFF Library
+        test suite has widths and heights slightly less than the tile sizes, and
+        it apparently used the bogus computation below to determine the number
+        of Bytes per scan line (was this due to an old, broken version of
+        "TIFFhowmany()"?).  Before we get here, "OJPEGSetupDecode()" verified
+        that our image uses 8-bit samples, so the following check appears to
+        return the correct answer in all known cases tested to date.
+     */
+        if (is_JFIF || (segment_width & 7) == 0)
+          sp->bytesperline = TIFFTileRowSize(tif); /* Normal case */
+        else
+          {
+            /* Was the file-encoder's segment-width calculation bogus? */
+            segment_width = (segment_width/sp->h_sampling + 1) * sp->h_sampling;
+            sp->bytesperline = segment_width * td->td_samplesperpixel;
+          }
+      }
+    else sp->bytesperline = TIFFVStripSize(tif,1);
+
+ /* BEWARE OF KLUDGE:  If we have JPEG Interchange File Format (JFIF) image,
+                       then we want to read "metadata" in the bit-stream's
+    header and validate it against corresponding information in TIFF records.
+    But if we have a *really old* JPEG file that's not JFIF, then we simply
+    assign TIFF-record values to JPEG Library variables without checking.
+ */
+    if (is_JFIF) /* JFIF image */
+      { unsigned char *end_of_data;
+        int subsampling_factors;
+        register unsigned char *p;
+        register int i;
+
+     /* WARNING:  Although the image file contains a JFIF bit stream, it might
+                  also contain some old TIFF records causing "OJPEGVSetField()"
+        to have allocated quantization or Huffman decoding tables.  But when the
+        JPEG Library reads and parses the JFIF header below, it reallocate these
+        tables anew without checking for "dangling" pointers, thereby causing a
+        memory "leak".  We have enough information to potentially deallocate the
+        old tables here, but unfortunately JPEG Library Version 6B uses a "pool"
+        allocator for small objects, with no deallocation procedure; instead, it
+        reclaims a whole pool when an image is closed/destroyed, so well-behaved
+        TIFF client applications (i.e., those which close their JPEG images as
+        soon as they're no longer needed) will waste memory for a short time but
+        recover it eventually.  But ill-behaved TIFF clients (i.e., those which
+        keep many JPEG images open gratuitously) can exhaust memory prematurely.
+        If the JPEG Library ever implements a deallocation procedure, insert
+        this clean-up code:
+     */
+#       ifdef someday
+        if (sp->jpegtablesmode & JPEGTABLESMODE_QUANT) /* free quant. tables */
+          { register int i = 0;
+
+            do
+              { register JQUANT_TBL *q;
+
+                if (q = sp->cinfo.d.quant_tbl_ptrs[i])
+                  {
+                    jpeg_free_small(&sp->cinfo.comm,q,sizeof *q);
+                    sp->cinfo.d.quant_tbl_ptrs[i] = 0;
+                  }
+              }
+            while (++i < NUM_QUANT_TBLS);
+          };
+        if (sp->jpegtablesmode & JPEGTABLESMODE_HUFF) /* free Huffman tables */
+          { register int i = 0;
+
+            do
+              { register JHUFF_TBL *h;
+
+                if (h = sp->cinfo.d.dc_huff_tbl_ptrs[i])
+                  {
+                    jpeg_free_small(&sp->cinfo.comm,h,sizeof *h);
+                    sp->cinfo.d.dc_huff_tbl_ptrs[i] = 0;
+                  };
+                if (h = sp->cinfo.d.ac_huff_tbl_ptrs[i])
+                  {
+                    jpeg_free_small(&sp->cinfo.comm,h,sizeof *h);
+                    sp->cinfo.d.ac_huff_tbl_ptrs[i] = 0;
+                  }
+              }
+            while (++i < NUM_HUFF_TBLS);
+          };
+#       endif /* someday */
+
+     /* Since we might someday wish to try rewriting "old format" JPEG-in-TIFF
+        encapsulations in "new format" files, try to synthesize the value of a
+        modern "JPEGTables" TIFF record by scanning the JPEG data from just past
+        the "Start of Information" (SOI) marker until something other than a
+        legitimate "table" marker is found, as defined in ISO IS 10918-1
+        Appending B.2.4; namely:
+
+        -- Define Quantization Table (DQT)
+        -- Define Huffman Table (DHT)
+        -- Define Arithmetic Coding table (DAC)
+        -- Define Restart Interval (DRI)
+        -- Comment (COM)
+        -- Application data (APPn)
+
+        For convenience, we also accept "Expansion" (EXP) markers, although they
+        are apparently not a part of normal "table" data.
+     */
+        sp->jpegtables = p = (unsigned char *)sp->src.next_input_byte;
+        end_of_data = p + sp->src.bytes_in_buffer;
+        p += 2;
+        while (p < end_of_data && p[0] == 0xFF)
+          switch (p[1])
+            {
+              default  : goto L;
+              case 0xC0: /* SOF0  */
+              case 0xC1: /* SOF1  */
+              case 0xC2: /* SOF2  */
+              case 0xC3: /* SOF3  */
+              case 0xC4: /* DHT   */
+              case 0xC5: /* SOF5  */
+              case 0xC6: /* SOF6  */
+              case 0xC7: /* SOF7  */
+              case 0xC9: /* SOF9  */
+              case 0xCA: /* SOF10 */
+              case 0xCB: /* SOF11 */
+              case 0xCC: /* DAC   */
+              case 0xCD: /* SOF13 */
+              case 0xCE: /* SOF14 */
+              case 0xCF: /* SOF15 */
+              case 0xDB: /* DQT   */
+              case 0xDD: /* DRI   */
+              case 0xDF: /* EXP   */
+              case 0xE0: /* APP0  */
+              case 0xE1: /* APP1  */
+              case 0xE2: /* APP2  */
+              case 0xE3: /* APP3  */
+              case 0xE4: /* APP4  */
+              case 0xE5: /* APP5  */
+              case 0xE6: /* APP6  */
+              case 0xE7: /* APP7  */
+              case 0xE8: /* APP8  */
+              case 0xE9: /* APP9  */
+              case 0xEA: /* APP10 */
+              case 0xEB: /* APP11 */
+              case 0xEC: /* APP12 */
+              case 0xED: /* APP13 */
+              case 0xEE: /* APP14 */
+              case 0xEF: /* APP15 */
+              case 0xFE: /* COM   */
+                         p += (p[2] << 8 | p[3]) + 2;
+            };
+     L: if (p - (unsigned char *)sp->jpegtables > 2) /* fake "JPEGTables" */
+          {
+
+         /* In case our client application asks, pretend that this image file
+            contains a modern "JPEGTables" TIFF record by copying to a buffer
+            the initial part of the JFIF bit-stream that we just scanned, from
+            the SOI marker through the "metadata" tables, then append an EOI
+            marker and flag the "JPEGTables" TIFF record as "present".
+         */
+            sp->jpegtables_length = p - (unsigned char*)sp->jpegtables + 2;
+            p = sp->jpegtables;
+            if (!(sp->jpegtables = _TIFFmalloc(sp->jpegtables_length)))
+              {
+                TIFFError(module,no_jtable_space);
+                return 0;
+              };
+            _TIFFmemcpy(sp->jpegtables,p,sp->jpegtables_length-2);
+            p = (unsigned char *)sp->jpegtables + sp->jpegtables_length;
+            p[-2] = 0xFF; p[-1] = JPEG_EOI; /* Append EOI marker */
+            TIFFSetFieldBit(tif,FIELD_JPEGTABLES);
+            tif->tif_flags |= TIFF_DIRTYDIRECT;
+          }
+        else sp->jpegtables = 0; /* Don't simulate "JPEGTables" */
+        if (   CALLJPEG(sp,-1,jpeg_read_header(&sp->cinfo.d,TRUE))
+            != JPEG_HEADER_OK
+           ) return 0;
+        if (   sp->cinfo.d.image_width  != segment_width
+            || sp->cinfo.d.image_height != td->td_imagelength 
+           )
+          {
+            TIFFError(module,"Improper JPEG strip/tile size");
+            return 0;
+          };
+        if (sp->cinfo.d.num_components != td->td_samplesperpixel)
+          {
+            TIFFError(module,"Improper JPEG component count");
+            return 0;
+          };
+        if (sp->cinfo.d.data_precision != td->td_bitspersample)
+          {
+            TIFFError(module,"Improper JPEG data precision");
+            return 0;
+          };
+
+     /* Check that JPEG image components all have the same subsampling factors
+        declared (or defaulted) in the TIFF file, since TIFF Version 6.0 is more
+        restrictive than JPEG:  Only the 0th component may have horizontal and
+        vertical subsampling factors other than <1,1>.
+     */
+        subsampling_factors = sp->h_sampling << 3 | sp->v_sampling;
+        i = 0;
+        do
+          {
+            if (   ( sp->cinfo.d.comp_info[i].h_samp_factor << 3
+                   | sp->cinfo.d.comp_info[i].v_samp_factor
+                   )
+                != subsampling_factors
+               )
+              {
+                TIFFError(module,"Improper JPEG subsampling factors");
+                return 0;
+              };
+            subsampling_factors = 011; /* Required for image components > 0 */
+          }
+        while (++i < sp->cinfo.d.num_components);
+      }
+    else /* not JFIF image */
+      { int (*save)(j_decompress_ptr cinfo) = sp->cinfo.d.marker->read_markers;
+        register int i;
+
+     /* We're not assuming that this file's JPEG bit stream has any header
+        "metadata", so fool the JPEG Library into thinking that we read a
+        "Start of Input" (SOI) marker and a "Start of Frame" (SOFx) marker, then
+        force it to read a simulated "Start of Scan" (SOS) marker when we call
+        "jpeg_read_header()" below.  This should cause the JPEG Library to
+        establish reasonable defaults.
+     */
+        sp->cinfo.d.marker->saw_SOI =       /* Pretend we saw SOI marker */
+        sp->cinfo.d.marker->saw_SOF = TRUE; /* Pretend we saw SOF marker */
+        sp->cinfo.d.marker->read_markers =
+          sp->is_WANG ? suspend : fake_SOS_marker;
+        sp->cinfo.d.global_state = DSTATE_INHEADER;
+        sp->cinfo.d.Se = DCTSIZE2-1; /* Suppress JPEG Library warning */
+        sp->cinfo.d.image_width  = segment_width;
+        sp->cinfo.d.image_height = td->td_imagelength;
+
+     /* The following color-space initialization, including the complicated
+        "switch"-statement below, essentially duplicates the logic used by the
+        JPEG Library's "jpeg_init_colorspace()" subroutine during compression.
+     */
+        sp->cinfo.d.num_components = td->td_samplesperpixel;
+        sp->cinfo.d.comp_info = (jpeg_component_info *)
+          (*sp->cinfo.d.mem->alloc_small)
+            ( &sp->cinfo.comm
+            , JPOOL_IMAGE
+            , sp->cinfo.d.num_components * sizeof *sp->cinfo.d.comp_info
+            );
+        i = 0;
+        do
+          {
+            sp->cinfo.d.comp_info[i].component_index = i;
+            sp->cinfo.d.comp_info[i].component_needed = TRUE;
+            sp->cinfo.d.cur_comp_info[i] = &sp->cinfo.d.comp_info[i];
+          }
+        while (++i < sp->cinfo.d.num_components);
+        switch (jpeg_color_space)
+          {
+            case JCS_UNKNOWN  :
+              i = 0;
+              do
+                {
+                  sp->cinfo.d.comp_info[i].component_id = i;
+                  sp->cinfo.d.comp_info[i].h_samp_factor =
+                  sp->cinfo.d.comp_info[i].v_samp_factor = 1;
+                }
+              while (++i < sp->cinfo.d.num_components);
+              break;
+            case JCS_GRAYSCALE:
+              sp->cinfo.d.comp_info[0].component_id =
+              sp->cinfo.d.comp_info[0].h_samp_factor =
+              sp->cinfo.d.comp_info[0].v_samp_factor = 1;
+              break;
+            case JCS_RGB      :
+              sp->cinfo.d.comp_info[0].component_id = 'R';
+              sp->cinfo.d.comp_info[1].component_id = 'G';
+              sp->cinfo.d.comp_info[2].component_id = 'B';
+              i = 0;
+              do sp->cinfo.d.comp_info[i].h_samp_factor =
+                 sp->cinfo.d.comp_info[i].v_samp_factor = 1;
+              while (++i < sp->cinfo.d.num_components);
+              break;
+            case JCS_CMYK     :
+              sp->cinfo.d.comp_info[0].component_id = 'C';
+              sp->cinfo.d.comp_info[1].component_id = 'M';
+              sp->cinfo.d.comp_info[2].component_id = 'Y';
+              sp->cinfo.d.comp_info[3].component_id = 'K';
+              i = 0;
+              do sp->cinfo.d.comp_info[i].h_samp_factor =
+                 sp->cinfo.d.comp_info[i].v_samp_factor = 1;
+              while (++i < sp->cinfo.d.num_components);
+              break;
+            case JCS_YCbCr    :
+              i = 0;
+              do
+                {
+                  sp->cinfo.d.comp_info[i].component_id = i+1;
+                  sp->cinfo.d.comp_info[i].h_samp_factor =
+                  sp->cinfo.d.comp_info[i].v_samp_factor = 1;
+                  sp->cinfo.d.comp_info[i].quant_tbl_no =
+                  sp->cinfo.d.comp_info[i].dc_tbl_no =
+                  sp->cinfo.d.comp_info[i].ac_tbl_no = i > 0;
+                }
+              while (++i < sp->cinfo.d.num_components);
+              sp->cinfo.d.comp_info[0].h_samp_factor = sp->h_sampling;
+              sp->cinfo.d.comp_info[0].v_samp_factor = sp->v_sampling;
+          };
+        sp->cinfo.d.comps_in_scan = td->td_planarconfig == PLANARCONFIG_CONTIG
+                                  ? sp->cinfo.d.num_components
+                                  : 1;
+        i = CALLJPEG(sp,-1,jpeg_read_header(&sp->cinfo.d,!sp->is_WANG));
+        sp->cinfo.d.marker->read_markers = save; /* Restore input method */
+        if (sp->is_WANG) /* produced by Wang Imaging on Microsoft Windows */
+          {
+            if (i != JPEG_SUSPENDED) return 0;
+
+         /* BOGOSITY ALERT!  Files prooduced by the Wang Imaging application for
+                             Microsoft Windows are a special--and, technically
+            illegal--case.  A JPEG SOS marker and rest of the data stream should
+            be located at the end of the file, in a position identified by the
+            0th Strip offset.
+         */
+            i = td->td_nstrips - 1;
+            sp->src.next_input_byte = tif->tif_base + td->td_stripoffset[0];
+            sp->src.bytes_in_buffer = td->td_stripoffset[i] -
+              td->td_stripoffset[0] + td->td_stripbytecount[i];
+            i = CALLJPEG(sp,-1,jpeg_read_header(&sp->cinfo.d,TRUE));
+          };
+        if (i != JPEG_HEADER_OK) return 0;
+      };
+
+ /* Some of our initialization must wait until the JPEG Library is initialized
+    above, in order to override its defaults.
+ */
+    if (   (sp->cinfo.d.raw_data_out = downsampled_output)
+        && !alloc_downsampled_buffers(tif,sp->cinfo.d.comp_info,
+                                      sp->cinfo.d.num_components)
+       ) return 0;
+    sp->cinfo.d.jpeg_color_space = jpeg_color_space;
+    sp->cinfo.d.out_color_space = out_color_space;
+    sp->cinfo.d.dither_mode = JDITHER_NONE; /* Reduce image "noise" */
+    sp->cinfo.d.two_pass_quantize = FALSE;
+
+ /* If the image consists of separate, discontiguous TIFF "samples" (= color
+    planes, hopefully = JPEG "scans"), then we must use the JPEG Library's
+    "buffered image" mode to decompress the entire image into temporary buffers,
+    because the JPEG Library must parse the entire JPEG bit-stream in order to
+    be satsified that it has a complete set of color components for each pixel,
+    but the TIFF Library must allow our client to extract 1 component at a time.
+    Initializing the JPEG Library's "buffered image" mode is tricky:  First, we
+    start its decompressor, then we tell the decompressor to "consume" (i.e.,
+    buffer) the entire bit-stream.
+
+    WARNING:  Disabling "fancy" up-sampling seems to slightly reduce "noise" for
+              certain old Wang Imaging files, but it absolutely *must* be
+    enabled if the image has separate color planes, since in that case, the JPEG
+    Library doesn't use an "sp->cinfo.d.cconvert" structure (so de-referencing
+    this pointer below will cause a fatal crash) but writing our own code to up-
+    sample separate color planes is too much work for right now.  Maybe someday?
+ */
+    sp->cinfo.d.do_fancy_upsampling = /* Always let this default (to TRUE)? */
+    sp->cinfo.d.buffered_image = td->td_planarconfig == PLANARCONFIG_SEPARATE;
+    if (!CALLJPEG(sp,0,jpeg_start_decompress(&sp->cinfo.d))) return 0;
+    if (sp->cinfo.d.buffered_image) /* separate color planes */
+      {
+        if (sp->cinfo.d.raw_data_out)
+          tif->tif_decoderow = tif->tif_decodestrip = tif->tif_decodetile =
+            OJPEGDecodeRawSeparate;
+        else
+          {
+            tif->tif_decoderow = tif->tif_decodestrip = tif->tif_decodetile =
+              OJPEGDecode;
+
+         /* In JPEG Library Version 6B, color-space conversion isn't implemented
+            for separate color planes, so we must do it ourself if our TIFF
+            client doesn't want to:
+         */
+            sp->cinfo.d.cconvert->color_convert =
+              sp->cinfo.d.jpeg_color_space == sp->cinfo.d.out_color_space
+              ? null_convert : ycc_rgb_convert;
+          };
+    L3: switch (CALLJPEG(sp,0,jpeg_consume_input(&sp->cinfo.d)))
+          {
+            default              : goto L3;
+
+         /* If no JPEG "End of Information" (EOI) marker is found when bit-
+            stream parsing ends, check whether we have enough data to proceed
+            before reporting an error.
+         */
+            case JPEG_SUSPENDED  : if (  sp->cinfo.d.input_scan_number
+                                        *sp->cinfo.d.image_height
+                                       + sp->cinfo.d.input_iMCU_row
+                                        *sp->cinfo.d.max_v_samp_factor
+#                                       ifdef D_LOSSLESS_SUPPORTED
+                                        *sp->cinfo.d.data_units_in_MCU
+                                        *sp->cinfo.d.min_codec_data_unit
+#                                       else
+                                        *sp->cinfo.d.blocks_in_MCU
+                                        *DCTSIZE
+#                                       endif
+                                      < td->td_samplesperpixel
+                                       *sp->cinfo.d.image_height
+                                      )
+                                     {
+                                       TIFFError(tif->tif_name,
+                                         "Premature end of JPEG bit-stream");
+                                       return 0;
+                                     }
+            case JPEG_REACHED_EOI: ;
+          }
+      }
+    else /* pixel-interleaved color planes */
+      tif->tif_decoderow = tif->tif_decodestrip = tif->tif_decodetile =
+        downsampled_output ? OJPEGDecodeRawContig : OJPEGDecode;
+    return 1;
+#   undef td
+  }
 
-#ifndef LIBJPEG_ENCAP_EXTERNAL
-static void
-jpeg_encap_unwind(TIFF* tif)
-{
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	LONGJMP(sp->exit_jmpbuf,1);
-}
-#endif
+static int
+OJPEGPreDecode(register TIFF *tif,tsample_t s)
+  { register OJPEGState *sp = OJState(tif);
+#   define td (&tif->tif_dir)
+
+ /* If we are about to read the first row of an image plane (hopefully, these
+    are coincident with JPEG "scans"!), reset the JPEG Library's decompressor
+    appropriately.  Otherwise, let the decompressor run "as is" and return a
+    "success" status without further ado.
+ */
+    if (     (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip)
+           % td->td_stripsperimage
+        == 0
+       )
+      {
+        if (   sp->cinfo.d.buffered_image
+            && !CALLJPEG(sp,0,jpeg_start_output(&sp->cinfo.d,s+1))
+           ) return 0;
+        sp->cinfo.d.output_scanline = 0;
+
+     /* Mark subsampling buffers "empty". */
+
+#       ifdef D_LOSSLESS_SUPPORTED
+        sp->scancount = sp->cinfo.d.min_codec_data_unit;
+#       else
+        sp->scancount = DCTSIZE;
+#       endif
+      };
+    return 1;
+#   undef td
+  }
+
+/*ARGSUSED*/ static void
+OJPEGPostDecode(register TIFF *tif,tidata_t buf,tsize_t cc)
+  { register OJPEGState *sp = OJState(tif);
+#   define td (&tif->tif_dir)
+
+ /* The JPEG Library decompressor has reached the end of a strip/tile.  If this
+    is the end of a TIFF image "sample" (= JPEG "scan") in a file with separate
+    components (color planes), then end the "scan".  If it ends the image's last
+    sample/scan, then also stop the JPEG Library's decompressor.
+ */
+    if (sp->cinfo.d.output_scanline >= sp->cinfo.d.output_height)
+      {
+        if (sp->cinfo.d.buffered_image)
+          CALLJPEG(sp,-1,jpeg_finish_output(&sp->cinfo.d)); /* End JPEG scan */
+        if (   (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip)
+            >= td->td_nstrips-1
+           ) CALLJPEG(sp,0,jpeg_finish_decompress(&sp->cinfo.d));
+      }
+#   undef td
+  }
 
-static void
-OJPEGLibjpegJpegErrorMgrOutputMessage(jpeg_common_struct* cinfo)
+static int
+OJPEGVSetField(register TIFF *tif,ttag_t tag,va_list ap)
 {
-	char buffer[JMSG_LENGTH_MAX];
-	(*cinfo->err->format_message)(cinfo,buffer);
-	TIFFWarningExt(((TIFF*)(cinfo->client_data))->tif_clientdata,"LibJpeg", "%s", buffer);
-}
+    uint32 v32;
+    register OJPEGState *sp = OJState(tif);
+#   define td (&tif->tif_dir)
+    toff_t tiffoff=0;
+    uint32 bufoff=0;
+    uint32 code_count=0;
+    int i2=0;
+    int k2=0;
+
+    switch (tag)
+      {
+        default                            : return
+                                               (*sp->vsetparent)(tif,tag,ap);
+
+     /* BEWARE OF KLUDGE:  Some old-format JPEG-in-TIFF files, including those
+                           produced by the Wang Imaging application for Micro-
+        soft Windows, illegally omit a "ReferenceBlackWhite" TIFF tag, even
+        though the TIFF specification's default is intended for the RGB color
+        space and is inappropriate for the YCbCr color space ordinarily used for
+        JPEG images.  Since many TIFF client applications request the value of
+        this tag immediately after a TIFF image directory is parsed, and before
+        any other code in this module receives control, we are forced to fix
+        this problem very early in image-file processing.  Fortunately, legal
+        TIFF files are supposed to store their tags in numeric order, so a
+        mandatory "PhotometricInterpretation" tag should always appear before
+        an optional "ReferenceBlackWhite" tag.  Hence, we slyly peek ahead when
+        we discover the desired photometry, by installing modified black and
+        white reference levels.
+     */
+        case TIFFTAG_PHOTOMETRIC           :
+          if (   (v32 = (*sp->vsetparent)(tif,tag,ap))
+              && td->td_photometric == PHOTOMETRIC_YCBCR
+             )
+	  {
+		float *ref;
+		if (!TIFFGetField(tif, TIFFTAG_REFERENCEBLACKWHITE, &ref)) {
+			float refbw[6];
+			long top = 1L << td->td_bitspersample;
+			refbw[0] = 0;
+			refbw[1] = (float)(top-1L);
+			refbw[2] = (float)(top>>1);
+			refbw[3] = refbw[1];
+			refbw[4] = refbw[2];
+			refbw[5] = refbw[1];
+			TIFFSetField(tif, TIFFTAG_REFERENCEBLACKWHITE, refbw);
+		}
+	  }
+          return v32;
+
+     /* BEWARE OF KLUDGE:  According to Charles Auer <Bumble731@msn.com>, if our
+                           input is a multi-image (multi-directory) JPEG-in-TIFF
+        file is produced by the Wang Imaging application on Microsoft Windows,
+        for some reason the first directory excludes the vendor-specific "WANG
+        PageControl" tag (32934) that we check below, so the only other way to
+        identify these directories is apparently to look for a software-
+        identification tag with the substring, "Wang Labs".  Single-image files
+        can apparently pass both tests, which causes no harm here, but what a
+        mess this is!
+     */
+        case TIFFTAG_SOFTWARE              :
+        {
+            char *software;
+
+            v32 = (*sp->vsetparent)(tif,tag,ap);
+            if( TIFFGetField( tif, TIFFTAG_SOFTWARE, &software )
+                && strstr( software, "Wang Labs" ) )
+                sp->is_WANG = 1;
+            return v32;
+        }
+
+        case TIFFTAG_JPEGPROC              :
+        case TIFFTAG_JPEGIFOFFSET          :
+        case TIFFTAG_JPEGIFBYTECOUNT       :
+        case TIFFTAG_JPEGRESTARTINTERVAL   :
+        case TIFFTAG_JPEGLOSSLESSPREDICTORS:
+        case TIFFTAG_JPEGPOINTTRANSFORM    :
+        case TIFFTAG_JPEGQTABLES           :
+        case TIFFTAG_JPEGDCTABLES          :
+        case TIFFTAG_JPEGACTABLES          :
+        case TIFFTAG_WANG_PAGECONTROL      :
+        case TIFFTAG_JPEGCOLORMODE         : ;
+      };
+    v32 = va_arg(ap,uint32); /* No. of values in this TIFF record */
+
+    /* This switch statement is added for OJPEGVSetField */
+    if(v32 !=0){
+        switch(tag){
+            case TIFFTAG_JPEGPROC:
+                sp->jpegproc=v32;
+                break;
+            case TIFFTAG_JPEGIFOFFSET:
+                sp->jpegifoffset=v32;
+		break;
+            case TIFFTAG_JPEGIFBYTECOUNT:
+		sp->jpegifbytecount=v32;
+		break;
+            case TIFFTAG_JPEGRESTARTINTERVAL:
+		sp->jpegrestartinterval=v32;
+		break;
+            case TIFFTAG_JPEGLOSSLESSPREDICTORS:
+		sp->jpeglosslesspredictors_length=v32;
+		break;
+            case TIFFTAG_JPEGPOINTTRANSFORM:
+		sp->jpegpointtransform_length=v32;
+		break;
+            case TIFFTAG_JPEGQTABLES:
+		sp->jpegqtables_length=v32;
+		break;
+            case TIFFTAG_JPEGACTABLES:
+		sp->jpegactables_length=v32;
+		break;
+            case TIFFTAG_JPEGDCTABLES:
+		sp->jpegdctables_length=v32;
+		break;
+            default:
+		break;
+        }
+    }
+
+ /* BEWARE:  The following actions apply only if we are reading a "source" TIFF
+             image to be decompressed for a client application program.  If we
+    ever enhance this file's CODEC to write "destination" JPEG-in-TIFF images,
+    we'll need an "if"- and another "switch"-statement below, because we'll
+    probably want to store these records' values in some different places.  Most
+    of these need not be parsed here in order to decode JPEG bit stream, so we
+    set boolean flags to note that they have been seen, but we otherwise ignore
+    them.
+ */
+    switch (tag)
+      { JHUFF_TBL **h;
+
+     /* Validate the JPEG-process code. */
+
+        case TIFFTAG_JPEGPROC              :
+          switch (v32)
+            {
+              default               : TIFFError(tif->tif_name,
+                                        "Unknown JPEG process");
+                                      return 0;
+#             ifdef C_LOSSLESS_SUPPORTED
+
+           /* Image uses (lossy) baseline sequential coding. */
+
+              case JPEGPROC_BASELINE: sp->cinfo.d.process = JPROC_SEQUENTIAL;
+                                      sp->cinfo.d.data_unit = DCTSIZE;
+                                      break;
+
+           /* Image uses (lossless) Huffman coding. */
+
+              case JPEGPROC_LOSSLESS: sp->cinfo.d.process = JPROC_LOSSLESS;
+                                      sp->cinfo.d.data_unit = 1;
+#             else /* not C_LOSSLESS_SUPPORTED */
+              case JPEGPROC_LOSSLESS: TIFFError(JPEGLib_name,
+                                        "Does not support lossless Huffman coding");
+                                      return 0;
+              case JPEGPROC_BASELINE: ;
+#             endif /* C_LOSSLESS_SUPPORTED */
+            };
+          break;
+
+     /* The TIFF Version 6.0 specification says that if the value of a TIFF
+        "JPEGInterchangeFormat" record is 0, then we are to behave as if this
+        record were absent; i.e., the data does *not* represent a JPEG Inter-
+        change Format File (JFIF), so don't even set the boolean "I've been
+        here" flag below.  Otherwise, the field's value represents the file
+        offset of the JPEG SOI marker.
+     */
+        case TIFFTAG_JPEGIFOFFSET          :
+          if (v32)
+            {
+              sp->src.next_input_byte = tif->tif_base + v32;
+              break;
+            };
+          return 1;
+        case TIFFTAG_JPEGIFBYTECOUNT       :
+          sp->src.bytes_in_buffer = v32;
+          break;
+
+     /* The TIFF Version 6.0 specification says that if the JPEG "Restart"
+        marker interval is 0, then the data has no "Restart" markers; i.e., we
+        must behave as if this TIFF record were absent.  So, don't even set the
+        boolean "I've been here" flag below.
+     */
+     /*
+      * Instead, set the field bit so TIFFGetField can get whether or not
+      * it was set.
+      */
+        case TIFFTAG_JPEGRESTARTINTERVAL   :
+          if (v32)
+              sp->cinfo.d.restart_interval = v32;
+              break;
+     /* The TIFF Version 6.0 specification says that this tag is supposed to be
+        a vector containing a value for each image component, but for lossless
+        Huffman coding (the only JPEG process defined by the specification for
+        which this tag should be needed), ISO IS 10918-1 uses only a single
+        value, equivalent to the "Ss" field in a JPEG bit-stream's "Start of
+        Scan" (SOS) marker.  So, we extract the first vector element and ignore
+        the rest.  (I hope this is correct!)
+     */
+        case TIFFTAG_JPEGLOSSLESSPREDICTORS:
+           if (v32)
+             {
+               sp->cinfo.d.Ss = *va_arg(ap,uint16 *);
+               sp->jpeglosslesspredictors = 
+		    _TIFFmalloc(sp->jpeglosslesspredictors_length
+				* sizeof(uint16));
+               if(sp->jpeglosslesspredictors==NULL){return(0);}
+               for(i2=0;i2<sp->jpeglosslesspredictors_length;i2++){
+                ((uint16*)sp->jpeglosslesspredictors)[i2] =
+			((uint16*)sp->cinfo.d.Ss)[i2];
+               }
+               sp->jpeglosslesspredictors_length*=sizeof(uint16);
+               break;
+             };
+           return v32;
+
+     /* The TIFF Version 6.0 specification says that this tag is supposed to be
+        a vector containing a value for each image component, but for lossless
+        Huffman coding (the only JPEG process defined by the specification for
+        which this tag should be needed), ISO IS 10918-1 uses only a single
+        value, equivalent to the "Al" field in a JPEG bit-stream's "Start of
+        Scan" (SOS) marker.  So, we extract the first vector element and ignore
+        the rest.  (I hope this is correct!)
+     */
+        case TIFFTAG_JPEGPOINTTRANSFORM    :
+           if (v32)
+             {
+               sp->cinfo.d.Al = *va_arg(ap,uint16 *);
+               sp->jpegpointtransform =
+		    _TIFFmalloc(sp->jpegpointtransform_length*sizeof(uint16));
+               if(sp->jpegpointtransform==NULL){return(0);}
+               for(i2=0;i2<sp->jpegpointtransform_length;i2++) {
+                ((uint16*)sp->jpegpointtransform)[i2] =
+			((uint16*)sp->cinfo.d.Al)[i2];
+               }
+               sp->jpegpointtransform_length*=sizeof(uint16);
+               break;
+             }
+           return v32;
+
+     /* We have a vector of offsets to quantization tables, so load 'em! */
+
+        case TIFFTAG_JPEGQTABLES           :
+          if (v32)
+            { uint32 *v;
+              int i;
+              if (v32 > NUM_QUANT_TBLS)
+                {
+                  TIFFError(tif->tif_name,"Too many quantization tables");
+                  return 0;
+                };
+              i = 0;
+              v = va_arg(ap,uint32 *);
+                sp->jpegqtables=_TIFFmalloc(64*sp->jpegqtables_length);
+                if(sp->jpegqtables==NULL){return(0);}
+                tiffoff = TIFFSeekFile(tif, 0, SEEK_CUR);
+                bufoff=0;
+                for(i2=0;i2<sp->jpegqtables_length;i2++){
+                    TIFFSeekFile(tif, v[i2], SEEK_SET);
+                    TIFFReadFile(tif, &(((unsigned char*)(sp->jpegqtables))[bufoff]),
+				 64);
+                    bufoff+=64;
+                }
+                sp->jpegqtables_length=bufoff;
+                TIFFSeekFile(tif, tiffoff, SEEK_SET);
+
+              do /* read quantization table */
+                { register UINT8 *from = tif->tif_base + *v++;
+                  register UINT16 *to;
+                  register int j = DCTSIZE2;
+
+                  if (!( sp->cinfo.d.quant_tbl_ptrs[i]
+                       = CALLJPEG(sp,0,jpeg_alloc_quant_table(&sp->cinfo.comm))
+                       )
+                     )
+                    {
+                      TIFFError(JPEGLib_name,"No space for quantization table");
+                      return 0;
+                    };
+                  to = sp->cinfo.d.quant_tbl_ptrs[i]->quantval;
+                  do *to++ = *from++; while (--j > 0);
+                }
+              while (++i < v32);
+              sp->jpegtablesmode |= JPEGTABLESMODE_QUANT;
+            };
+          break;
+
+     /* We have a vector of offsets to DC Huffman tables, so load 'em! */
+
+        case TIFFTAG_JPEGDCTABLES          :
+          h = sp->cinfo.d.dc_huff_tbl_ptrs;
+          goto L;
+
+     /* We have a vector of offsets to AC Huffman tables, so load 'em! */
+
+        case TIFFTAG_JPEGACTABLES          :
+          h = sp->cinfo.d.ac_huff_tbl_ptrs;
+       L: if (v32)
+            { uint32 *v;
+              int i;
+              if (v32 > NUM_HUFF_TBLS)
+                {
+                  TIFFError(tif->tif_name,"Too many Huffman tables");
+                  return 0;
+                };
+              v = va_arg(ap,uint32 *);
+                if(tag == TIFFTAG_JPEGDCTABLES) {
+                    sp->jpegdctables=_TIFFmalloc(272*sp->jpegdctables_length);
+                    if(sp->jpegdctables==NULL){return(0);}
+                    tiffoff = TIFFSeekFile(tif, 0, SEEK_CUR);
+                    bufoff=0;
+                    code_count=0;                
+                    for(i2=0;i2<sp->jpegdctables_length;i2++){
+                        TIFFSeekFile(tif, v[i2], SEEK_SET);
+                        TIFFReadFile(tif,
+				     &(((unsigned char*)(sp->jpegdctables))[bufoff]),
+				     16);
+                        code_count=0;
+                        for(k2=0;k2<16;k2++){
+                            code_count+=((unsigned char*)(sp->jpegdctables))[k2+bufoff];
+                        }
+                        TIFFReadFile(tif,
+				     &(((unsigned char*)(sp->jpegdctables))[bufoff+16]),
+				     code_count);
+                        bufoff+=16;
+                        bufoff+=code_count;
+                    }
+                    sp->jpegdctables_length=bufoff;
+                    TIFFSeekFile(tif, tiffoff, SEEK_SET);
+                }
+                if(tag==TIFFTAG_JPEGACTABLES){
+                    sp->jpegactables=_TIFFmalloc(272*sp->jpegactables_length);
+                    if(sp->jpegactables==NULL){return(0);}
+                    tiffoff = TIFFSeekFile(tif, 0, SEEK_CUR);
+                    bufoff=0;
+                    code_count=0;                
+                    for(i2=0;i2<sp->jpegactables_length;i2++){
+                        TIFFSeekFile(tif, v[i2], SEEK_SET);
+                        TIFFReadFile(tif, &(((unsigned char*)(sp->jpegactables))[bufoff]), 16);
+                        code_count=0;
+                        for(k2=0;k2<16;k2++){
+                            code_count+=((unsigned char*)(sp->jpegactables))[k2+bufoff];
+                        }
+                        TIFFReadFile(tif, &(((unsigned char*)(sp->jpegactables))[bufoff+16]), code_count);
+                        bufoff+=16;
+                        bufoff+=code_count;
+                    }
+                    sp->jpegactables_length=bufoff;
+                    TIFFSeekFile(tif, tiffoff, SEEK_SET);
+                }
+              i = 0;
+              do /* copy each Huffman table */
+                { int size = 0;
+                  register UINT8 *from = tif->tif_base + *v++, *to;
+                  register int j = sizeof (*h)->bits;
+
+               /* WARNING:  This code relies on the fact that an image file not
+                            "memory mapped" was read entirely into a single
+                  buffer by "TIFFInitOJPEG()", so we can do a fast memory-to-
+                  memory copy here.  Each table consists of 16 Bytes, which are
+                  suffixed to a 0 Byte when copied, followed by a variable
+                  number of Bytes whose length is the sum of the first 16.
+               */
+                  if (!( *h
+                       = CALLJPEG(sp,0,jpeg_alloc_huff_table(&sp->cinfo.comm))
+                       )
+                     )
+                    {
+                      TIFFError(JPEGLib_name,"No space for Huffman table");
+                      return 0;
+                    };
+                  to = (*h++)->bits;
+                  *to++ = 0;
+                  while (--j > 0) size += *to++ = *from++; /* Copy 16 Bytes */
+                  if (size > sizeof (*h)->huffval/sizeof *(*h)->huffval)
+                    {
+                      TIFFError(tif->tif_name,"Huffman table too big");
+                      return 0;
+                    };
+                  if ((j = size) > 0) do *to++ = *from++; while (--j > 0);
+                  while (++size <= sizeof (*h)->huffval/sizeof *(*h)->huffval)
+                    *to++ = 0; /* Zero the rest of the table for cleanliness */
+                }
+              while (++i < v32);
+              sp->jpegtablesmode |= JPEGTABLESMODE_HUFF;
+            };
+          break;
+
+     /* The following vendor-specific TIFF tag occurs in (highly illegal) files
+        produced by the Wang Imaging application for Microsoft Windows.  These
+        can apparently have several "pages", in which case this tag specifies
+        the offset of a "page control" structure, which we don't currently know
+        how to handle.  0 indicates a 1-page image with no "page control", which
+        we make a feeble effort to handle.
+     */
+        case TIFFTAG_WANG_PAGECONTROL      :
+          if (v32 == 0) v32 = -1;
+          sp->is_WANG = v32;
+          tag = TIFFTAG_JPEGPROC+FIELD_WANG_PAGECONTROL-FIELD_JPEGPROC;
+          break;
+
+     /* This pseudo tag indicates whether our caller is expected to do YCbCr <->
+        RGB color-space conversion (JPEGCOLORMODE_RAW <=> 0) or whether we must
+        ask the JPEG Library to do it (JPEGCOLORMODE_RGB <=> 1).
+     */
+        case TIFFTAG_JPEGCOLORMODE         :
+          sp->jpegcolormode = v32;
+
+       /* Mark the image to indicate whether returned data is up-sampled, so
+          that "TIFF{Strip,Tile}Size()" reflect the true amount of data present.
+       */
+          v32 = tif->tif_flags; /* Save flags temporarily */
+          tif->tif_flags &= ~TIFF_UPSAMPLED;
+          if (   td->td_photometric == PHOTOMETRIC_YCBCR
+              &&    (td->td_ycbcrsubsampling[0]<<3 | td->td_ycbcrsubsampling[1])
+                 != 011
+              && sp->jpegcolormode == JPEGCOLORMODE_RGB
+             ) tif->tif_flags |= TIFF_UPSAMPLED;
+
+       /* If the up-sampling state changed, re-calculate tile size. */
+
+          if ((tif->tif_flags ^ v32) & TIFF_UPSAMPLED)
+            {
+              tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
+              tif->tif_flags |= TIFF_DIRTYDIRECT;
+            };
+          return 1;
+      };
+    TIFFSetFieldBit(tif,tag-TIFFTAG_JPEGPROC+FIELD_JPEGPROC);
+    return 1;
+#   undef td
+  }
 
-static void
-OJPEGLibjpegJpegErrorMgrErrorExit(jpeg_common_struct* cinfo)
-{
-	char buffer[JMSG_LENGTH_MAX];
-	(*cinfo->err->format_message)(cinfo,buffer);
-	TIFFErrorExt(((TIFF*)(cinfo->client_data))->tif_clientdata,"LibJpeg", "%s", buffer);
-	jpeg_encap_unwind((TIFF*)(cinfo->client_data));
-}
+static int
+OJPEGVGetField(register TIFF *tif,ttag_t tag,va_list ap)
+  { register OJPEGState *sp = OJState(tif);
+
+    switch (tag)
+      {
+
+     /* If this file has managed to synthesize a set of consolidated "metadata"
+        tables for the current (post-TIFF Version 6.0 specification) JPEG-in-
+        TIFF encapsulation strategy, then tell our caller about them; otherwise,
+        keep mum.
+     */
+        case TIFFTAG_JPEGTABLES            :
+          if (sp->jpegtables_length) /* we have "new"-style JPEG tables */
+            {
+              *va_arg(ap,uint32 *) = sp->jpegtables_length;
+              *va_arg(ap,char **) = sp->jpegtables;
+              return 1;
+            };
+
+     /* This pseudo tag indicates whether our caller is expected to do YCbCr <->
+        RGB color-space conversion (JPEGCOLORMODE_RAW <=> 0) or whether we must
+        ask the JPEG Library to do it (JPEGCOLORMODE_RGB <=> 1).
+     */
+        case TIFFTAG_JPEGCOLORMODE         :
+          *va_arg(ap,uint32 *) = sp->jpegcolormode;
+          return 1;
+
+     /* The following tags are defined by the TIFF Version 6.0 specification
+        and are obsolete.  If our caller asks for information about them, do not
+        return anything, even if we parsed them in an old-format "source" image.
+     */
+        case TIFFTAG_JPEGPROC              :
+		*va_arg(ap, uint16*)=sp->jpegproc;
+		return(1);
+		break;
+        case TIFFTAG_JPEGIFOFFSET          :
+		*va_arg(ap, uint32*)=sp->jpegifoffset;
+		return(1);
+		break;
+        case TIFFTAG_JPEGIFBYTECOUNT       :
+		*va_arg(ap, uint32*)=sp->jpegifbytecount;
+		return(1);
+		break;
+        case TIFFTAG_JPEGRESTARTINTERVAL   :
+		*va_arg(ap, uint32*)=sp->jpegrestartinterval;
+		return(1);
+		break;
+        case TIFFTAG_JPEGLOSSLESSPREDICTORS:
+                *va_arg(ap, uint32*)=sp->jpeglosslesspredictors_length;
+                *va_arg(ap, void**)=sp->jpeglosslesspredictors;
+                return(1);
+                break;
+        case TIFFTAG_JPEGPOINTTRANSFORM    :
+                *va_arg(ap, uint32*)=sp->jpegpointtransform_length;
+                *va_arg(ap, void**)=sp->jpegpointtransform;
+                return(1);
+                break;
+        case TIFFTAG_JPEGQTABLES           :
+                *va_arg(ap, uint32*)=sp->jpegqtables_length;
+                *va_arg(ap, void**)=sp->jpegqtables;
+                return(1);
+                break;
+        case TIFFTAG_JPEGDCTABLES          :
+                *va_arg(ap, uint32*)=sp->jpegdctables_length;
+                *va_arg(ap, void**)=sp->jpegdctables;
+                return(1);
+                break;
+        case TIFFTAG_JPEGACTABLES          : 
+                *va_arg(ap, uint32*)=sp->jpegactables_length;
+                *va_arg(ap, void**)=sp->jpegactables;
+                return(1);
+                break;
+      };
+    return (*sp->vgetparent)(tif,tag,ap);
+  }
 
 static void
-OJPEGLibjpegJpegSourceMgrInitSource(jpeg_decompress_struct* cinfo)
-{
-	(void)cinfo;
-}
-
-static boolean
-OJPEGLibjpegJpegSourceMgrFillInputBuffer(jpeg_decompress_struct* cinfo)
-{
-	TIFF* tif=(TIFF*)cinfo->client_data;
-	OJPEGState* sp=(OJPEGState*)tif->tif_data;
-	void* mem=0;
-	uint32 len=0;
-	if (OJPEGWriteStream(tif,&mem,&len)==0)
-	{
-		TIFFErrorExt(tif->tif_clientdata,"LibJpeg","Premature end of JPEG data");
-		jpeg_encap_unwind(tif);
-	}
-	sp->libjpeg_jpeg_source_mgr.bytes_in_buffer=len;
-	sp->libjpeg_jpeg_source_mgr.next_input_byte=mem;
-	return(1);
-}
+OJPEGPrintDir(register TIFF *tif,FILE *fd,long flags)
+  { register OJPEGState *sp = OJState(tif);
+
+    if (   ( flags
+           & (TIFFPRINT_JPEGQTABLES|TIFFPRINT_JPEGDCTABLES|TIFFPRINT_JPEGACTABLES)
+           )
+        && sp->jpegtables_length
+       )
+      fprintf(fd,"  JPEG Table Data: <present>, %lu bytes\n",
+        sp->jpegtables_length);
+  }
+
+static uint32
+OJPEGDefaultStripSize(register TIFF *tif,register uint32 s)
+  { register OJPEGState *sp = OJState(tif);
+#   define td (&tif->tif_dir)
+
+    if ((s = (*sp->defsparent)(tif,s)) < td->td_imagelength)
+      { register tsize_t size = sp->cinfo.comm.is_decompressor
+#                             ifdef D_LOSSLESS_SUPPORTED
+                              ? sp->cinfo.d.min_codec_data_unit
+#                             else
+                              ? DCTSIZE
+#                             endif
+#                             ifdef C_LOSSLESS_SUPPORTED
+                              : sp->cinfo.c.data_unit;
+#                             else
+                              : DCTSIZE;
+#                             endif
+
+        size = TIFFroundup(size,16);
+        s = TIFFroundup(s,td->td_ycbcrsubsampling[1]*size);
+      };
+    return s;
+#   undef td
+  }
 
 static void
-OJPEGLibjpegJpegSourceMgrSkipInputData(jpeg_decompress_struct* cinfo, long num_bytes)
-{
-	TIFF* tif=(TIFF*)cinfo->client_data;
-	(void)num_bytes;
-	TIFFErrorExt(tif->tif_clientdata,"LibJpeg","Unexpected error");
-	jpeg_encap_unwind(tif);
-}
-
-static boolean
-OJPEGLibjpegJpegSourceMgrResyncToRestart(jpeg_decompress_struct* cinfo, int desired)
-{
-	TIFF* tif=(TIFF*)cinfo->client_data;
-	(void)desired;
-	TIFFErrorExt(tif->tif_clientdata,"LibJpeg","Unexpected error");
-	jpeg_encap_unwind(tif);
-	return(0);
-}
+OJPEGDefaultTileSize(register TIFF *tif,register uint32 *tw,register uint32 *th)
+  { register OJPEGState *sp = OJState(tif);
+    register tsize_t size;
+#   define td (&tif->tif_dir)
+
+    size = sp->cinfo.comm.is_decompressor
+#        ifdef D_LOSSLESS_SUPPORTED
+         ? sp->cinfo.d.min_codec_data_unit
+#        else
+         ? DCTSIZE
+#        endif
+#        ifdef C_LOSSLESS_SUPPORTED
+         : sp->cinfo.c.data_unit;
+#        else
+         : DCTSIZE;
+#        endif
+    size = TIFFroundup(size,16);
+    (*sp->deftparent)(tif,tw,th);
+    *tw = TIFFroundup(*tw,td->td_ycbcrsubsampling[0]*size);
+    *th = TIFFroundup(*th,td->td_ycbcrsubsampling[1]*size);
+#   undef td
+  }
 
 static void
-OJPEGLibjpegJpegSourceMgrTermSource(jpeg_decompress_struct* cinfo)
-{
-	(void)cinfo;
-}
-
-#endif
+OJPEGCleanUp(register TIFF *tif)
+  { register OJPEGState *sp;
+
+    if ( (sp = OJState(tif)) )
+      {
+        CALLVJPEG(sp,jpeg_destroy(&sp->cinfo.comm)); /* Free JPEG Lib. vars. */
+        if (sp->jpegtables) {_TIFFfree(sp->jpegtables);sp->jpegtables=0;}
+        if (sp->jpeglosslesspredictors) {
+		_TIFFfree(sp->jpeglosslesspredictors);
+		sp->jpeglosslesspredictors = 0;
+	}
+        if (sp->jpegpointtransform) {
+		_TIFFfree(sp->jpegpointtransform);
+		sp->jpegpointtransform=0;
+	}
+        if (sp->jpegqtables) {_TIFFfree(sp->jpegqtables);sp->jpegqtables=0;}
+        if (sp->jpegactables) {_TIFFfree(sp->jpegactables);sp->jpegactables=0;}
+        if (sp->jpegdctables) {_TIFFfree(sp->jpegdctables);sp->jpegdctables=0;}
+     /* If the image file isn't "memory mapped" and we read it all into a
+        single, large memory buffer, free the buffer now.
+     */
+        if (!isMapped(tif) && tif->tif_base) /* free whole-file buffer */
+          {
+            _TIFFfree(tif->tif_base);
+            tif->tif_base = 0;
+            tif->tif_size = 0;
+          };
+        _TIFFfree(sp); /* Release local variables */
+        tif->tif_data = 0;
+      }
+  }
 
+int
+TIFFInitOJPEG(register TIFF *tif,int scheme)
+  { register OJPEGState *sp;
+#   define td (&tif->tif_dir)
+#   ifndef never
+
+ /* This module supports a decompression-only CODEC, which is intended strictly
+    for viewing old image files using the obsolete JPEG-in-TIFF encapsulation
+    specified by the TIFF Version 6.0 specification.  It does not, and never
+    should, support compression for new images.  If a client application asks us
+    to, refuse and complain loudly!
+ */
+    if (tif->tif_mode != O_RDONLY) return _notSupported(tif);
+#   endif /* never */
+    if (!isMapped(tif))
+      {
+
+     /* BEWARE OF KLUDGE:  If our host operating-system doesn't let an image
+                           file be "memory mapped", then we want to read the
+        entire file into a single (possibly large) memory buffer as if it had
+        been "memory mapped".  Although this is likely to waste space, because
+        analysis of the file's content might cause parts of it to be read into
+        smaller buffers duplicatively, it appears to be the lesser of several
+        evils.  Very old JPEG-in-TIFF encapsulations aren't guaranteed to be
+        JFIF bit streams, or to have a TIFF "JPEGTables" record or much other
+        "metadata" to help us locate the decoding tables and entropy-coded data,
+        so we're likely do a lot of random-access grokking around, and we must
+        ultimately tell the JPEG Library to sequentially scan much of the file
+        anyway.  This is all likely to be easier if we use "brute force" to
+        read the entire file, once, and don't use incremental disc I/O.  If our
+        client application tries to process a file so big that we can't buffer
+        it entirely, then tough shit: we'll give up and exit!
+     */
+        if (!(tif->tif_base = _TIFFmalloc(tif->tif_size=TIFFGetFileSize(tif))))
+          {
+            TIFFError(tif->tif_name,"Cannot allocate file buffer");
+            return 0;
+          };
+        if (!SeekOK(tif,0) || !ReadOK(tif,tif->tif_base,tif->tif_size))
+          {
+            TIFFError(tif->tif_name,"Cannot read file");
+            return 0;
+          }
+      };
+
+ /* Allocate storage for this module's per-file variables. */
+
+    if (!(tif->tif_data = (tidata_t)_TIFFmalloc(sizeof *sp)))
+      {
+        TIFFError("TIFFInitOJPEG","No space for JPEG state block");
+        return 0;
+      };
+    (sp = OJState(tif))->tif = tif; /* Initialize reverse pointer */
+    sp->cinfo.d.err = jpeg_std_error(&sp->err); /* Initialize error handling */
+    sp->err.error_exit = TIFFojpeg_error_exit;
+    sp->err.output_message = TIFFojpeg_output_message;
+    if (!CALLVJPEG(sp,jpeg_create_decompress(&sp->cinfo.d))) return 0;
+
+ /* Install CODEC-specific tag information and override default TIFF Library
+    "method" subroutines with our own, CODEC-specific methods.  Like all good
+    members of an object-class, we save some of these subroutine pointers for
+    "fall back" in case our own methods fail.
+ */
+    _TIFFMergeFieldInfo(tif,ojpegFieldInfo,
+      sizeof ojpegFieldInfo/sizeof *ojpegFieldInfo);
+    sp->defsparent = tif->tif_defstripsize;
+    sp->deftparent = tif->tif_deftilesize;
+    sp->vgetparent = tif->tif_tagmethods.vgetfield;
+    sp->vsetparent = tif->tif_tagmethods.vsetfield;
+    tif->tif_defstripsize = OJPEGDefaultStripSize;
+    tif->tif_deftilesize = OJPEGDefaultTileSize;
+    tif->tif_tagmethods.vgetfield = OJPEGVGetField;
+    tif->tif_tagmethods.vsetfield = OJPEGVSetField;
+    tif->tif_tagmethods.printdir = OJPEGPrintDir;
+#   ifdef never
+    tif->tif_setupencode = OJPEGSetupEncode;
+    tif->tif_preencode = OJPEGPreEncode;
+    tif->tif_postencode = OJPEGPostEncode;
+#   else /* well, hardly ever */
+    tif->tif_setupencode = tif->tif_postencode = _notSupported;
+    tif->tif_preencode = (TIFFPreMethod)_notSupported;
+#   endif /* never */
+    tif->tif_setupdecode = OJPEGSetupDecode;
+    tif->tif_predecode = OJPEGPreDecode;
+    tif->tif_postdecode = OJPEGPostDecode;
+    tif->tif_cleanup = OJPEGCleanUp;
+
+ /* If the image file doesn't have "JPEGInterchangeFormat[Length]" TIFF records
+    to guide us, we have few clues about where its encapsulated JPEG bit stream
+    is located, so establish intelligent defaults:  If the Image File Directory
+    doesn't immediately follow the TIFF header, assume that the JPEG data lies
+    in between; otherwise, assume that it follows the Image File Directory.
+ */
+    if (tif->tif_header.tiff_diroff > sizeof tif->tif_header)
+      {
+        sp->src.next_input_byte = tif->tif_base + sizeof tif->tif_header;
+        sp->src.bytes_in_buffer = tif->tif_header.tiff_diroff
+                                - sizeof tif->tif_header;
+      }
+    else /* this case is ugly! */
+      { uint32 maxoffset = tif->tif_size;
+        uint16 dircount;
+
+     /* Calculate the offset to the next Image File Directory, if there is one,
+        or to the end of the file, if not.  Then arrange to read the file from
+        the end of the Image File Directory to that offset.
+     */
+        if (tif->tif_nextdiroff) maxoffset = tif->tif_nextdiroff; /* Not EOF */
+        _TIFFmemcpy(&dircount,(const tdata_t)
+          (sp->src.next_input_byte = tif->tif_base+tif->tif_header.tiff_diroff),
+          sizeof dircount);
+        if (tif->tif_flags & TIFF_SWAB) TIFFSwabShort(&dircount);
+        sp->src.next_input_byte += dircount*sizeof(TIFFDirEntry)
+                                + sizeof maxoffset + sizeof dircount;
+        sp->src.bytes_in_buffer = tif->tif_base - sp->src.next_input_byte
+                                + maxoffset;
+      };
+
+ /* IJG JPEG Library Version 6B can be configured for either 8- or 12-bit sample
+    precision, but we assume that "old JPEG" TIFF clients only need 8 bits.
+ */
+    sp->cinfo.d.data_precision = 8;
+#   ifdef C_LOSSLESS_SUPPORTED
 
+ /* If the "JPEGProc" TIFF tag is missing from the Image File Dictionary, the
+    JPEG Library will use its (lossy) baseline sequential process by default.
+ */
+    sp->cinfo.d.data_unit = DCTSIZE;
+#   endif /* C_LOSSLESS_SUPPORTED */
+
+ /* Initialize other CODEC-specific variables requiring default values. */
+
+    tif->tif_flags |= TIFF_NOBITREV; /* No bit-reversal within data bytes */
+    sp->h_sampling = sp->v_sampling = 1; /* No subsampling by default */
+    sp->is_WANG = 0; /* Assume not a MS Windows Wang Imaging file by default */
+    sp->jpegtables = 0; /* No "new"-style JPEG tables synthesized yet */
+    sp->jpegtables_length = 0;
+    sp->jpegquality = 75; /* Default IJG quality */
+    sp->jpegcolormode = JPEGCOLORMODE_RAW;
+    sp->jpegtablesmode = 0; /* No tables found yet */
+    sp->jpeglosslesspredictors=0;
+    sp->jpeglosslesspredictors_length=0;
+    sp->jpegpointtransform=0;
+    sp->jpegpointtransform_length=0;
+    sp->jpegqtables=0;
+    sp->jpegqtables_length=0;
+    sp->jpegdctables=0;
+    sp->jpegdctables_length=0;
+    sp->jpegactables=0;
+    sp->jpegactables_length=0;
+    return 1;
+#   undef td
+  }
+#endif /* OJPEG_SUPPORT */
+
+/* vim: set ts=8 sts=8 sw=8 noet: */