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Diffstat (limited to 'src/libtiff/tif_ojpeg.c')
| -rw-r--r-- | src/libtiff/tif_ojpeg.c | 2629 |
1 files changed, 2629 insertions, 0 deletions
diff --git a/src/libtiff/tif_ojpeg.c b/src/libtiff/tif_ojpeg.c new file mode 100644 index 0000000..ecc5e08 --- /dev/null +++ b/src/libtiff/tif_ojpeg.c @@ -0,0 +1,2629 @@ +/* $Id: tif_ojpeg.c,v 1.1 2008/10/17 06:16:07 scuri Exp $ */ + +#include "tiffiop.h" +#ifdef OJPEG_SUPPORT + +/* 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" +#undef JPEG_CJPEG_DJPEG +#undef JPEG_INTERNALS + +/* Hack for files produced by Wang Imaging application on Microsoft Windows */ +extern void jpeg_reset_huff_decode(j_decompress_ptr); + +/* 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 + +#define TIFFTAG_WANG_PAGECONTROL 32934 + +/* Bit-vector offsets for keeping track of TIFF records that we've parsed. */ + +#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) + +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 +TIFFojpeg_error_exit(register j_common_ptr cinfo) +{ + 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 +TIFFojpeg_output_message(register j_common_ptr cinfo) + { char buffer[JMSG_LENGTH_MAX]; + + /* 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); + } + +/* 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 +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 +std_init_destination(register j_compress_ptr cinfo){} /* "Dummy" stub */ + +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 +std_term_destination(register j_compress_ptr cinfo) + { +# define sp ((OJPEGState *)cinfo) + register TIFF *tif = sp->tif; + + /* 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 + } + +/* Alternate destination manager to output JPEGTables field: */ + +static void +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 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 +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 +_notSupported(register TIFF *tif) + { const TIFFCodec *c = TIFFFindCODEC(tif->tif_dir.td_compression); + + 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 +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 boolean +std_fill_input_buffer(register j_decompress_ptr cinfo) + { static const JOCTET dummy_EOI[2]={0xFF,JPEG_EOI}; +# define sp ((OJPEGState *)cinfo) + + /* 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 +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 +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; + } + +static int +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 + } + +static int +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 + } + +static int +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); + } + +static int +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); + + /* 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 + } + +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 int +OJPEGVSetField(register TIFF *tif,ttag_t tag,va_list ap) +{ + 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 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 +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 +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 +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: */ |