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Diffstat (limited to 'src/libpng/pngread.c')
-rw-r--r--src/libpng/pngread.c376
1 files changed, 187 insertions, 189 deletions
diff --git a/src/libpng/pngread.c b/src/libpng/pngread.c
index 02efb0d..370ecba 100644
--- a/src/libpng/pngread.c
+++ b/src/libpng/pngread.c
@@ -1,9 +1,9 @@
/* pngread.c - read a PNG file
*
- * Last changed in libpng 1.2.20 September 7, 2007
+ * Last changed in libpng 1.2.37 [June 4, 2009]
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
@@ -13,7 +13,6 @@
#define PNG_INTERNAL
#include "png.h"
-
#if defined(PNG_READ_SUPPORTED)
/* Create a PNG structure for reading, and allocate any memory needed. */
@@ -35,6 +34,9 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
{
#endif /* PNG_USER_MEM_SUPPORTED */
+#ifdef PNG_SETJMP_SUPPORTED
+ volatile
+#endif
png_structp png_ptr;
#ifdef PNG_SETJMP_SUPPORTED
@@ -45,7 +47,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
int i;
- png_debug(1, "in png_create_read_struct\n");
+ png_debug(1, "in png_create_read_struct");
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
(png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
@@ -55,7 +57,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
if (png_ptr == NULL)
return (NULL);
- /* added at libpng-1.2.6 */
+ /* Added at libpng-1.2.6 */
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
@@ -69,7 +71,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
#endif
{
png_free(png_ptr, png_ptr->zbuf);
- png_ptr->zbuf=NULL;
+ png_ptr->zbuf = NULL;
#ifdef PNG_USER_MEM_SUPPORTED
png_destroy_struct_2((png_voidp)png_ptr,
(png_free_ptr)free_fn, (png_voidp)mem_ptr);
@@ -79,7 +81,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
return (NULL);
}
#ifdef USE_FAR_KEYWORD
- png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
+ png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
#endif
#endif
@@ -89,12 +91,18 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
- i=0;
- do
+ if (user_png_ver)
{
- if(user_png_ver[i] != png_libpng_ver[i])
+ i = 0;
+ do
+ {
+ if (user_png_ver[i] != png_libpng_ver[i])
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+ } while (png_libpng_ver[i++]);
+ }
+ else
png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
- } while (png_libpng_ver[i++]);
+
if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
{
@@ -122,14 +130,14 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
png_warning(png_ptr, msg);
#endif
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- png_ptr->flags=0;
+ png_ptr->flags = 0;
#endif
png_error(png_ptr,
"Incompatible libpng version in application and library");
}
}
- /* initialize zbuf - compression buffer */
+ /* Initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
@@ -158,7 +166,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
PNG_ABORT();
- png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
+ png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
#else
if (setjmp(png_ptr->jmpbuf))
PNG_ABORT();
@@ -184,13 +192,14 @@ png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
png_size_t png_struct_size, png_size_t png_info_size)
{
/* We only come here via pre-1.0.12-compiled applications */
- if(png_ptr == NULL) return;
+ if (png_ptr == NULL)
+ return;
#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
- if(png_sizeof(png_struct) > png_struct_size ||
+ if (png_sizeof(png_struct) > png_struct_size ||
png_sizeof(png_info) > png_info_size)
{
char msg[80];
- png_ptr->warning_fn=NULL;
+ png_ptr->warning_fn = NULL;
if (user_png_ver)
{
png_snprintf(msg, 80,
@@ -204,20 +213,20 @@ png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
png_warning(png_ptr, msg);
}
#endif
- if(png_sizeof(png_struct) > png_struct_size)
+ if (png_sizeof(png_struct) > png_struct_size)
{
- png_ptr->error_fn=NULL;
+ png_ptr->error_fn = NULL;
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- png_ptr->flags=0;
+ png_ptr->flags = 0;
#endif
png_error(png_ptr,
"The png struct allocated by the application for reading is too small.");
}
- if(png_sizeof(png_info) > png_info_size)
+ if (png_sizeof(png_info) > png_info_size)
{
- png_ptr->error_fn=NULL;
+ png_ptr->error_fn = NULL;
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- png_ptr->flags=0;
+ png_ptr->flags = 0;
#endif
png_error(png_ptr,
"The info struct allocated by application for reading is too small.");
@@ -234,20 +243,21 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
jmp_buf tmp_jmp; /* to save current jump buffer */
#endif
- int i=0;
+ int i = 0;
png_structp png_ptr=*ptr_ptr;
- if(png_ptr == NULL) return;
+ if (png_ptr == NULL)
+ return;
do
{
- if(user_png_ver[i] != png_libpng_ver[i])
+ if (user_png_ver[i] != png_libpng_ver[i])
{
#ifdef PNG_LEGACY_SUPPORTED
png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
#else
- png_ptr->warning_fn=NULL;
+ png_ptr->warning_fn = NULL;
png_warning(png_ptr,
"Application uses deprecated png_read_init() and should be recompiled.");
break;
@@ -255,35 +265,35 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
}
} while (png_libpng_ver[i++]);
- png_debug(1, "in png_read_init_3\n");
+ png_debug(1, "in png_read_init_3");
#ifdef PNG_SETJMP_SUPPORTED
- /* save jump buffer and error functions */
- png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+ /* Save jump buffer and error functions */
+ png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
#endif
- if(png_sizeof(png_struct) > png_struct_size)
- {
- png_destroy_struct(png_ptr);
- *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
- png_ptr = *ptr_ptr;
- }
+ if (png_sizeof(png_struct) > png_struct_size)
+ {
+ png_destroy_struct(png_ptr);
+ *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+ png_ptr = *ptr_ptr;
+ }
- /* reset all variables to 0 */
- png_memset(png_ptr, 0, png_sizeof (png_struct));
+ /* Reset all variables to 0 */
+ png_memset(png_ptr, 0, png_sizeof(png_struct));
#ifdef PNG_SETJMP_SUPPORTED
- /* restore jump buffer */
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+ /* Restore jump buffer */
+ png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
#endif
- /* added at libpng-1.2.6 */
+ /* Added at libpng-1.2.6 */
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
#endif
- /* initialize zbuf - compression buffer */
+ /* Initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
@@ -318,8 +328,9 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
void PNGAPI
png_read_info(png_structp png_ptr, png_infop info_ptr)
{
- if(png_ptr == NULL) return;
- png_debug(1, "in png_read_info\n");
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+ png_debug(1, "in png_read_info");
/* If we haven't checked all of the PNG signature bytes, do so now. */
if (png_ptr->sig_bytes < 8)
{
@@ -341,7 +352,7 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
}
- for(;;)
+ for (;;)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_CONST PNG_IHDR;
@@ -400,38 +411,29 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
PNG_CONST PNG_zTXt;
#endif
#endif /* PNG_USE_LOCAL_ARRAYS */
- png_byte chunk_length[4];
- png_uint_32 length;
-
- png_read_data(png_ptr, chunk_length, 4);
- length = png_get_uint_31(png_ptr,chunk_length);
-
- png_reset_crc(png_ptr);
- png_crc_read(png_ptr, png_ptr->chunk_name, 4);
-
- png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name,
- length);
+ png_uint_32 length = png_read_chunk_header(png_ptr);
+ PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
/* This should be a binary subdivision search or a hash for
* matching the chunk name rather than a linear search.
*/
- if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
- if(png_ptr->mode & PNG_AFTER_IDAT)
+ if (!png_memcmp(chunk_name, png_IDAT, 4))
+ if (png_ptr->mode & PNG_AFTER_IDAT)
png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
- if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
+ if (!png_memcmp(chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
- else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+ else if (!png_memcmp(chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
- else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+ else if (png_handle_as_unknown(png_ptr, chunk_name))
{
- if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ if (!png_memcmp(chunk_name, png_IDAT, 4))
png_ptr->mode |= PNG_HAVE_IDAT;
png_handle_unknown(png_ptr, info_ptr, length);
- if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ if (!png_memcmp(chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
- else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ else if (!png_memcmp(chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
@@ -442,9 +444,9 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
}
}
#endif
- else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ else if (!png_memcmp(chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
- else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ else if (!png_memcmp(chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
@@ -457,71 +459,71 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
break;
}
#if defined(PNG_READ_bKGD_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
+ else if (!png_memcmp(chunk_name, png_bKGD, 4))
png_handle_bKGD(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
+ else if (!png_memcmp(chunk_name, png_cHRM, 4))
png_handle_cHRM(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
+ else if (!png_memcmp(chunk_name, png_gAMA, 4))
png_handle_gAMA(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
+ else if (!png_memcmp(chunk_name, png_hIST, 4))
png_handle_hIST(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
+ else if (!png_memcmp(chunk_name, png_oFFs, 4))
png_handle_oFFs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
+ else if (!png_memcmp(chunk_name, png_pCAL, 4))
png_handle_pCAL(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+ else if (!png_memcmp(chunk_name, png_sCAL, 4))
png_handle_sCAL(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
+ else if (!png_memcmp(chunk_name, png_pHYs, 4))
png_handle_pHYs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
+ else if (!png_memcmp(chunk_name, png_sBIT, 4))
png_handle_sBIT(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
+ else if (!png_memcmp(chunk_name, png_sRGB, 4))
png_handle_sRGB(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+ else if (!png_memcmp(chunk_name, png_iCCP, 4))
png_handle_iCCP(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+ else if (!png_memcmp(chunk_name, png_sPLT, 4))
png_handle_sPLT(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
+ else if (!png_memcmp(chunk_name, png_tEXt, 4))
png_handle_tEXt(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
+ else if (!png_memcmp(chunk_name, png_tIME, 4))
png_handle_tIME(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
+ else if (!png_memcmp(chunk_name, png_tRNS, 4))
png_handle_tRNS(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
+ else if (!png_memcmp(chunk_name, png_zTXt, 4))
png_handle_zTXt(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+ else if (!png_memcmp(chunk_name, png_iTXt, 4))
png_handle_iTXt(png_ptr, info_ptr, length);
#endif
else
@@ -530,12 +532,13 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
}
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
-/* optional call to update the users info_ptr structure */
+/* Optional call to update the users info_ptr structure */
void PNGAPI
png_read_update_info(png_structp png_ptr, png_infop info_ptr)
{
- png_debug(1, "in png_read_update_info\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_read_update_info");
+ if (png_ptr == NULL)
+ return;
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
else
@@ -553,8 +556,9 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
void PNGAPI
png_start_read_image(png_structp png_ptr)
{
- png_debug(1, "in png_start_read_image\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_start_read_image");
+ if (png_ptr == NULL)
+ return;
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
}
@@ -567,18 +571,19 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_CONST PNG_IDAT;
PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
- 0xff};
+ 0xff};
PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
#endif
int ret;
- if(png_ptr == NULL) return;
- png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
+ if (png_ptr == NULL)
+ return;
+ png_debug2(1, "in png_read_row (row %lu, pass %d)",
png_ptr->row_number, png_ptr->pass);
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
- /* check for transforms that have been set but were defined out */
+ /* Check for transforms that have been set but were defined out */
#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_MONO)
png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
@@ -610,7 +615,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
}
#if defined(PNG_READ_INTERLACING_SUPPORTED)
- /* if interlaced and we do not need a new row, combine row and return */
+ /* If interlaced and we do not need a new row, combine row and return */
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
switch (png_ptr->pass)
@@ -697,15 +702,9 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
{
while (!png_ptr->idat_size)
{
- png_byte chunk_length[4];
-
png_crc_finish(png_ptr, 0);
- png_read_data(png_ptr, chunk_length, 4);
- png_ptr->idat_size = png_get_uint_31(png_ptr,chunk_length);
-
- png_reset_crc(png_ptr);
- png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+ png_ptr->idat_size = png_read_chunk_header(png_ptr);
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_error(png_ptr, "Not enough image data");
}
@@ -741,7 +740,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
png_ptr->row_info.width);
- if(png_ptr->row_buf[0])
+ if (png_ptr->row_buf[0])
png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
(int)(png_ptr->row_buf[0]));
@@ -750,7 +749,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
png_ptr->rowbytes + 1);
#if defined(PNG_MNG_FEATURES_SUPPORTED)
- if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
{
/* Intrapixel differencing */
@@ -763,15 +762,15 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
png_do_read_transformations(png_ptr);
#if defined(PNG_READ_INTERLACING_SUPPORTED)
- /* blow up interlaced rows to full size */
+ /* Blow up interlaced rows to full size */
if (png_ptr->interlaced &&
(png_ptr->transformations & PNG_INTERLACE))
{
if (png_ptr->pass < 6)
-/* old interface (pre-1.0.9):
- png_do_read_interlace(&(png_ptr->row_info),
- png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
- */
+ /* Old interface (pre-1.0.9):
+ * png_do_read_interlace(&(png_ptr->row_info),
+ * png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+ */
png_do_read_interlace(png_ptr);
if (dsp_row != NULL)
@@ -829,8 +828,9 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
png_bytepp rp;
png_bytepp dp;
- png_debug(1, "in png_read_rows\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_read_rows");
+ if (png_ptr == NULL)
+ return;
rp = row;
dp = display_row;
if (rp != NULL && dp != NULL)
@@ -841,14 +841,14 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
png_read_row(png_ptr, rptr, dptr);
}
- else if(rp != NULL)
+ else if (rp != NULL)
for (i = 0; i < num_rows; i++)
{
png_bytep rptr = *rp;
png_read_row(png_ptr, rptr, png_bytep_NULL);
rp++;
}
- else if(dp != NULL)
+ else if (dp != NULL)
for (i = 0; i < num_rows; i++)
{
png_bytep dptr = *dp;
@@ -874,12 +874,13 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
void PNGAPI
png_read_image(png_structp png_ptr, png_bytepp image)
{
- png_uint_32 i,image_height;
+ png_uint_32 i, image_height;
int pass, j;
png_bytepp rp;
- png_debug(1, "in png_read_image\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_read_image");
+ if (png_ptr == NULL)
+ return;
#ifdef PNG_READ_INTERLACING_SUPPORTED
pass = png_set_interlace_handling(png_ptr);
@@ -914,11 +915,9 @@ png_read_image(png_structp png_ptr, png_bytepp image)
void PNGAPI
png_read_end(png_structp png_ptr, png_infop info_ptr)
{
- png_byte chunk_length[4];
- png_uint_32 length;
-
- png_debug(1, "in png_read_end\n");
- if(png_ptr == NULL) return;
+ png_debug(1, "in png_read_end");
+ if (png_ptr == NULL)
+ return;
png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
do
@@ -980,33 +979,27 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
PNG_CONST PNG_zTXt;
#endif
#endif /* PNG_USE_LOCAL_ARRAYS */
+ png_uint_32 length = png_read_chunk_header(png_ptr);
+ PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
- png_read_data(png_ptr, chunk_length, 4);
- length = png_get_uint_31(png_ptr,chunk_length);
-
- png_reset_crc(png_ptr);
- png_crc_read(png_ptr, png_ptr->chunk_name, 4);
-
- png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name);
-
- if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
+ if (!png_memcmp(chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
- else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+ else if (!png_memcmp(chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
- else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+ else if (png_handle_as_unknown(png_ptr, chunk_name))
{
- if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ if (!png_memcmp(chunk_name, png_IDAT, 4))
{
if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
png_error(png_ptr, "Too many IDAT's found");
}
png_handle_unknown(png_ptr, info_ptr, length);
- if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ if (!png_memcmp(chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
}
#endif
- else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ else if (!png_memcmp(chunk_name, png_IDAT, 4))
{
/* Zero length IDATs are legal after the last IDAT has been
* read, but not after other chunks have been read.
@@ -1015,74 +1008,74 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
png_error(png_ptr, "Too many IDAT's found");
png_crc_finish(png_ptr, length);
}
- else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ else if (!png_memcmp(chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
#if defined(PNG_READ_bKGD_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
+ else if (!png_memcmp(chunk_name, png_bKGD, 4))
png_handle_bKGD(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
+ else if (!png_memcmp(chunk_name, png_cHRM, 4))
png_handle_cHRM(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
+ else if (!png_memcmp(chunk_name, png_gAMA, 4))
png_handle_gAMA(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
+ else if (!png_memcmp(chunk_name, png_hIST, 4))
png_handle_hIST(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
+ else if (!png_memcmp(chunk_name, png_oFFs, 4))
png_handle_oFFs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
+ else if (!png_memcmp(chunk_name, png_pCAL, 4))
png_handle_pCAL(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+ else if (!png_memcmp(chunk_name, png_sCAL, 4))
png_handle_sCAL(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
+ else if (!png_memcmp(chunk_name, png_pHYs, 4))
png_handle_pHYs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
+ else if (!png_memcmp(chunk_name, png_sBIT, 4))
png_handle_sBIT(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
+ else if (!png_memcmp(chunk_name, png_sRGB, 4))
png_handle_sRGB(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+ else if (!png_memcmp(chunk_name, png_iCCP, 4))
png_handle_iCCP(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+ else if (!png_memcmp(chunk_name, png_sPLT, 4))
png_handle_sPLT(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
+ else if (!png_memcmp(chunk_name, png_tEXt, 4))
png_handle_tEXt(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
+ else if (!png_memcmp(chunk_name, png_tIME, 4))
png_handle_tIME(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
+ else if (!png_memcmp(chunk_name, png_tRNS, 4))
png_handle_tRNS(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
+ else if (!png_memcmp(chunk_name, png_zTXt, 4))
png_handle_zTXt(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+ else if (!png_memcmp(chunk_name, png_iTXt, 4))
png_handle_iTXt(png_ptr, info_ptr, length);
#endif
else
@@ -1091,7 +1084,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
}
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
-/* free all memory used by the read */
+/* Free all memory used by the read */
void PNGAPI
png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
png_infopp end_info_ptr_ptr)
@@ -1099,13 +1092,20 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
png_structp png_ptr = NULL;
png_infop info_ptr = NULL, end_info_ptr = NULL;
#ifdef PNG_USER_MEM_SUPPORTED
- png_free_ptr free_fn;
- png_voidp mem_ptr;
+ png_free_ptr free_fn = NULL;
+ png_voidp mem_ptr = NULL;
#endif
- png_debug(1, "in png_destroy_read_struct\n");
+ png_debug(1, "in png_destroy_read_struct");
if (png_ptr_ptr != NULL)
png_ptr = *png_ptr_ptr;
+ if (png_ptr == NULL)
+ return;
+
+#ifdef PNG_USER_MEM_SUPPORTED
+ free_fn = png_ptr->free_fn;
+ mem_ptr = png_ptr->mem_ptr;
+#endif
if (info_ptr_ptr != NULL)
info_ptr = *info_ptr_ptr;
@@ -1113,11 +1113,6 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
if (end_info_ptr_ptr != NULL)
end_info_ptr = *end_info_ptr_ptr;
-#ifdef PNG_USER_MEM_SUPPORTED
- free_fn = png_ptr->free_fn;
- mem_ptr = png_ptr->mem_ptr;
-#endif
-
png_read_destroy(png_ptr, info_ptr, end_info_ptr);
if (info_ptr != NULL)
@@ -1161,7 +1156,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
}
}
-/* free all memory used by the read (old method) */
+/* Free all memory used by the read (old method) */
void /* PRIVATE */
png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
{
@@ -1175,7 +1170,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
png_free_ptr free_fn;
#endif
- png_debug(1, "in png_read_destroy\n");
+ png_debug(1, "in png_read_destroy");
if (info_ptr != NULL)
png_info_destroy(png_ptr, info_ptr);
@@ -1185,6 +1180,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
png_free(png_ptr, png_ptr->zbuf);
png_free(png_ptr, png_ptr->big_row_buf);
png_free(png_ptr, png_ptr->prev_row);
+ png_free(png_ptr, png_ptr->chunkdata);
#if defined(PNG_READ_DITHER_SUPPORTED)
png_free(png_ptr, png_ptr->palette_lookup);
png_free(png_ptr, png_ptr->dither_index);
@@ -1281,7 +1277,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
* being used again.
*/
#ifdef PNG_SETJMP_SUPPORTED
- png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+ png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
#endif
error_fn = png_ptr->error_fn;
@@ -1291,7 +1287,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
free_fn = png_ptr->free_fn;
#endif
- png_memset(png_ptr, 0, png_sizeof (png_struct));
+ png_memset(png_ptr, 0, png_sizeof(png_struct));
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
@@ -1301,7 +1297,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
#endif
#ifdef PNG_SETJMP_SUPPORTED
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+ png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
#endif
}
@@ -1309,7 +1305,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
void PNGAPI
png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
{
- if(png_ptr == NULL) return;
+ if (png_ptr == NULL)
+ return;
png_ptr->read_row_fn = read_row_fn;
}
@@ -1323,9 +1320,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
{
int row;
- if(png_ptr == NULL) return;
+ if (png_ptr == NULL)
+ return;
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
- /* invert the alpha channel from opacity to transparency
+ /* Invert the alpha channel from opacity to transparency
*/
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
png_set_invert_alpha(png_ptr);
@@ -1336,15 +1334,15 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
*/
png_read_info(png_ptr, info_ptr);
if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
- png_error(png_ptr,"Image is too high to process with png_read_png()");
+ png_error(png_ptr, "Image is too high to process with png_read_png()");
/* -------------- image transformations start here ------------------- */
#if defined(PNG_READ_16_TO_8_SUPPORTED)
- /* tell libpng to strip 16 bit/color files down to 8 bits per color
+ /* Tell libpng to strip 16 bit/color files down to 8 bits per color.
*/
if (transforms & PNG_TRANSFORM_STRIP_16)
- png_set_strip_16(png_ptr);
+ png_set_strip_16(png_ptr);
#endif
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
@@ -1352,7 +1350,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
* the background (not recommended).
*/
if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
- png_set_strip_alpha(png_ptr);
+ png_set_strip_alpha(png_ptr);
#endif
#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
@@ -1360,7 +1358,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
* byte into separate bytes (useful for paletted and grayscale images).
*/
if (transforms & PNG_TRANSFORM_PACKING)
- png_set_packing(png_ptr);
+ png_set_packing(png_ptr);
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
@@ -1368,7 +1366,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
* (not useful if you are using png_set_packing).
*/
if (transforms & PNG_TRANSFORM_PACKSWAP)
- png_set_packswap(png_ptr);
+ png_set_packswap(png_ptr);
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED)
@@ -1378,9 +1376,9 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
* channels so the data will be available as RGBA quartets.
*/
if (transforms & PNG_TRANSFORM_EXPAND)
- if ((png_ptr->bit_depth < 8) ||
- (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
- (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+ if ((png_ptr->bit_depth < 8) ||
+ (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
+ (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
png_set_expand(png_ptr);
#endif
@@ -1388,10 +1386,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
*/
#if defined(PNG_READ_INVERT_SUPPORTED)
- /* invert monochrome files to have 0 as white and 1 as black
+ /* Invert monochrome files to have 0 as white and 1 as black
*/
if (transforms & PNG_TRANSFORM_INVERT_MONO)
- png_set_invert_mono(png_ptr);
+ png_set_invert_mono(png_ptr);
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED)
@@ -1410,24 +1408,24 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
#endif
#if defined(PNG_READ_BGR_SUPPORTED)
- /* flip the RGB pixels to BGR (or RGBA to BGRA)
+ /* Flip the RGB pixels to BGR (or RGBA to BGRA)
*/
if (transforms & PNG_TRANSFORM_BGR)
- png_set_bgr(png_ptr);
+ png_set_bgr(png_ptr);
#endif
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
- /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
+ /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
*/
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
png_set_swap_alpha(png_ptr);
#endif
#if defined(PNG_READ_SWAP_SUPPORTED)
- /* swap bytes of 16 bit files to least significant byte first
+ /* Swap bytes of 16 bit files to least significant byte first
*/
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
- png_set_swap(png_ptr);
+ png_set_swap(png_ptr);
#endif
/* We don't handle adding filler bytes */
@@ -1443,27 +1441,27 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
#ifdef PNG_FREE_ME_SUPPORTED
png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
#endif
- if(info_ptr->row_pointers == NULL)
+ if (info_ptr->row_pointers == NULL)
{
info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
info_ptr->height * png_sizeof(png_bytep));
+ png_memset(info_ptr->row_pointers, 0, info_ptr->height
+ * png_sizeof(png_bytep));
#ifdef PNG_FREE_ME_SUPPORTED
info_ptr->free_me |= PNG_FREE_ROWS;
#endif
for (row = 0; row < (int)info_ptr->height; row++)
- {
info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
png_get_rowbytes(png_ptr, info_ptr));
- }
}
png_read_image(png_ptr, info_ptr->row_pointers);
info_ptr->valid |= PNG_INFO_IDAT;
- /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+ /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
- transforms = transforms; /* quiet compiler warnings */
+ transforms = transforms; /* Quiet compiler warnings */
params = params;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 03:18:07 +0000