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authordimitri <dimitri@afe2bf4a-e733-0410-8a33-86f594647bc7>2008-01-16 19:20:21 (GMT)
committerdimitri <dimitri@afe2bf4a-e733-0410-8a33-86f594647bc7>2008-01-16 19:20:21 (GMT)
commit8dab665567c9dffaa3f5fea198fc2110d536594d (patch)
tree78bac4e928b25e139605aceefa82537f378d8af0 /libpng/pngpread.c
parentd3461a1c31f008345d784dc3e819047bc5265c30 (diff)
downloadDoxygen-8dab665567c9dffaa3f5fea198fc2110d536594d.zip
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Release-1.5.4
Diffstat (limited to 'libpng/pngpread.c')
-rw-r--r--libpng/pngpread.c368
1 files changed, 225 insertions, 143 deletions
diff --git a/libpng/pngpread.c b/libpng/pngpread.c
index 9207cbd..cb6f6d3 100644
--- a/libpng/pngpread.c
+++ b/libpng/pngpread.c
@@ -1,9 +1,9 @@
/* pngpread.c - read a png file in push mode
*
- * libpng 1.2.1 - December 12, 2001
+ * Last changed in libpng 1.2.22 [October 13, 2007]
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2007 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.)
*/
@@ -28,6 +28,7 @@ void PNGAPI
png_process_data(png_structp png_ptr, png_infop info_ptr,
png_bytep buffer, png_size_t buffer_size)
{
+ if(png_ptr == NULL) return;
png_push_restore_buffer(png_ptr, buffer, buffer_size);
while (png_ptr->buffer_size)
@@ -42,6 +43,7 @@ png_process_data(png_structp png_ptr, png_infop info_ptr,
void /* PRIVATE */
png_process_some_data(png_structp png_ptr, png_infop info_ptr)
{
+ if(png_ptr == NULL) return;
switch (png_ptr->process_mode)
{
case PNG_READ_SIG_MODE:
@@ -135,60 +137,60 @@ void /* PRIVATE */
png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
- PNG_IHDR;
- PNG_IDAT;
- PNG_IEND;
- PNG_PLTE;
+ PNG_CONST PNG_IHDR;
+ PNG_CONST PNG_IDAT;
+ PNG_CONST PNG_IEND;
+ PNG_CONST PNG_PLTE;
#if defined(PNG_READ_bKGD_SUPPORTED)
- PNG_bKGD;
+ PNG_CONST PNG_bKGD;
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
- PNG_cHRM;
+ PNG_CONST PNG_cHRM;
#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
- PNG_gAMA;
+ PNG_CONST PNG_gAMA;
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
- PNG_hIST;
+ PNG_CONST PNG_hIST;
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
- PNG_iCCP;
+ PNG_CONST PNG_iCCP;
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
- PNG_iTXt;
+ PNG_CONST PNG_iTXt;
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
- PNG_oFFs;
+ PNG_CONST PNG_oFFs;
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
- PNG_pCAL;
+ PNG_CONST PNG_pCAL;
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
- PNG_pHYs;
+ PNG_CONST PNG_pHYs;
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
- PNG_sBIT;
+ PNG_CONST PNG_sBIT;
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
- PNG_sCAL;
+ PNG_CONST PNG_sCAL;
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
- PNG_sRGB;
+ PNG_CONST PNG_sRGB;
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
- PNG_sPLT;
+ PNG_CONST PNG_sPLT;
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
- PNG_tEXt;
+ PNG_CONST PNG_tEXt;
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
- PNG_tIME;
+ PNG_CONST PNG_tIME;
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
- PNG_tRNS;
+ PNG_CONST PNG_tRNS;
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
- PNG_zTXt;
+ PNG_CONST PNG_zTXt;
#endif
#endif /* PNG_USE_LOCAL_ARRAYS */
/* First we make sure we have enough data for the 4 byte chunk name
@@ -208,12 +210,16 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
}
png_push_fill_buffer(png_ptr, chunk_length, 4);
- png_ptr->push_length = png_get_uint_32(chunk_length);
+ png_ptr->push_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_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
}
+ if (!png_memcmp(png_ptr->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_ptr->push_length + 4 > png_ptr->buffer_size)
@@ -221,29 +227,69 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
}
- else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
+ png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
+ png_ptr->process_mode = PNG_READ_DONE_MODE;
+ png_push_have_end(png_ptr, info_ptr);
+ }
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+ else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+ if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ png_ptr->mode |= PNG_HAVE_IDAT;
+ png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
+ if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ png_ptr->mode |= PNG_HAVE_PLTE;
+ else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ {
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before IDAT");
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+ !(png_ptr->mode & PNG_HAVE_PLTE))
+ png_error(png_ptr, "Missing PLTE before IDAT");
+ }
+ }
+#endif
+ else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
}
- else if (!png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
+ else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
/* If we reach an IDAT chunk, this means we have read all of the
* header chunks, and we can start reading the image (or if this
* is called after the image has been read - we have an error).
*/
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before IDAT");
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+ !(png_ptr->mode & PNG_HAVE_PLTE))
+ png_error(png_ptr, "Missing PLTE before IDAT");
+
if (png_ptr->mode & PNG_HAVE_IDAT)
{
- if (png_ptr->push_length == 0)
- return;
+ if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
+ if (png_ptr->push_length == 0)
+ return;
if (png_ptr->mode & PNG_AFTER_IDAT)
png_error(png_ptr, "Too many IDAT's found");
@@ -257,18 +303,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_ptr->zstream.next_out = png_ptr->row_buf;
return;
}
- else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
- {
- if (png_ptr->push_length + 4 > png_ptr->buffer_size)
- {
- png_push_save_buffer(png_ptr);
- return;
- }
-
- png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
- png_ptr->process_mode = PNG_READ_DONE_MODE;
- png_push_have_end(png_ptr, info_ptr);
- }
#if defined(PNG_READ_gAMA_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
{
@@ -277,7 +311,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -289,7 +322,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -301,7 +333,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -313,7 +344,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -325,7 +355,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -337,7 +366,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -349,7 +377,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -361,7 +388,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -373,7 +399,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -385,7 +410,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -397,7 +421,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -409,7 +432,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -421,7 +443,6 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
@@ -433,30 +454,49 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
{
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
{
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
{
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
else
{
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
}
@@ -518,11 +558,12 @@ png_push_crc_finish(png_structp png_ptr)
}
}
-void /* PRIVATE */
+void PNGAPI
png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
{
png_bytep ptr;
+ if(png_ptr == NULL) return;
ptr = buffer;
if (png_ptr->save_buffer_size)
{
@@ -581,6 +622,11 @@ png_push_save_buffer(png_structp png_ptr)
png_size_t new_max;
png_bytep old_buffer;
+ if (png_ptr->save_buffer_size > PNG_SIZE_MAX -
+ (png_ptr->current_buffer_size + 256))
+ {
+ png_error(png_ptr, "Potential overflow of save_buffer");
+ }
new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
old_buffer = png_ptr->save_buffer;
png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
@@ -614,7 +660,7 @@ void /* PRIVATE */
png_push_read_IDAT(png_structp png_ptr)
{
#ifdef PNG_USE_LOCAL_ARRAYS
- PNG_IDAT;
+ PNG_CONST PNG_IDAT;
#endif
if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
{
@@ -627,13 +673,12 @@ png_push_read_IDAT(png_structp png_ptr)
}
png_push_fill_buffer(png_ptr, chunk_length, 4);
- png_ptr->push_length = png_get_uint_32(chunk_length);
-
+ png_ptr->push_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_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
- if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
+ if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
@@ -658,8 +703,8 @@ png_push_read_IDAT(png_structp png_ptr)
save_size = png_ptr->save_buffer_size;
png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
- png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
-
+ if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
+ png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
png_ptr->idat_size -= save_size;
png_ptr->buffer_size -= save_size;
png_ptr->save_buffer_size -= save_size;
@@ -680,7 +725,8 @@ png_push_read_IDAT(png_structp png_ptr)
save_size = png_ptr->current_buffer_size;
png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
- png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
+ if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
+ png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
png_ptr->idat_size -= save_size;
png_ptr->buffer_size -= save_size;
@@ -697,6 +743,7 @@ png_push_read_IDAT(png_structp png_ptr)
png_crc_finish(png_ptr, 0);
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
+ png_ptr->mode |= PNG_AFTER_IDAT;
}
}
@@ -736,6 +783,18 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
}
if (!(png_ptr->zstream.avail_out))
{
+ if ((
+#if defined(PNG_READ_INTERLACING_SUPPORTED)
+ png_ptr->interlaced && png_ptr->pass > 6) ||
+ (!png_ptr->interlaced &&
+#endif
+ png_ptr->row_number == png_ptr->num_rows))
+ {
+ if (png_ptr->zstream.avail_in)
+ png_warning(png_ptr, "Too much data in IDAT chunks");
+ png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+ break;
+ }
png_push_process_row(png_ptr);
png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
png_ptr->zstream.next_out = png_ptr->row_buf;
@@ -754,8 +813,8 @@ png_push_process_row(png_structp png_ptr)
png_ptr->row_info.bit_depth = png_ptr->bit_depth;
png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
- png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
- (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
+ png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
+ png_ptr->row_info.width);
png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
@@ -764,7 +823,7 @@ png_push_process_row(png_structp png_ptr)
png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
png_ptr->rowbytes + 1);
- if (png_ptr->transformations)
+ if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
png_do_read_transformations(png_ptr);
#if defined(PNG_READ_INTERLACING_SUPPORTED)
@@ -796,13 +855,13 @@ png_push_process_row(png_structp png_ptr)
png_read_push_finish_row(png_ptr);
}
}
- if (png_ptr->pass == 4 && png_ptr->height <= 4)
- {
- for (i = 0; i < 2 && png_ptr->pass == 4; i++)
- {
- png_push_have_row(png_ptr, png_bytep_NULL);
- png_read_push_finish_row(png_ptr);
- }
+ if (png_ptr->pass == 4 && png_ptr->height <= 4)
+ {
+ for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+ {
+ png_push_have_row(png_ptr, png_bytep_NULL);
+ png_read_push_finish_row(png_ptr);
+ }
}
if (png_ptr->pass == 6 && png_ptr->height <= 4)
{
@@ -931,25 +990,20 @@ png_read_push_finish_row(png_structp png_ptr)
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
- const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+ PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
- const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+ PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
- const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+ PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
- const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-
- /* Width of interlace block. This is not currently used - if you need
- * it, uncomment it here and in png.h
- const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
- */
+ PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
/* Height of interlace block. This is not currently used - if you need
* it, uncomment it here and in png.h
- const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+ PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
*/
#endif
@@ -970,6 +1024,8 @@ png_read_push_finish_row(png_structp png_ptr)
(png_ptr->pass == 5 && png_ptr->width < 2))
png_ptr->pass++;
+ if (png_ptr->pass > 7)
+ png_ptr->pass--;
if (png_ptr->pass >= 7)
break;
@@ -978,8 +1034,8 @@ png_read_push_finish_row(png_structp png_ptr)
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
- png_ptr->irowbytes = ((png_ptr->iwidth *
- png_ptr->pixel_depth + 7) >> 3) + 1;
+ png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
+ png_ptr->iwidth) + 1;
if (png_ptr->transformations & PNG_INTERLACE)
break;
@@ -1001,8 +1057,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place tEXt");
- /* to quiet some compiler warnings */
- if(info_ptr == NULL) return;
+ info_ptr = info_ptr; /* to quiet some compiler warnings */
}
#ifdef PNG_MAX_MALLOC_64K
@@ -1045,6 +1100,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
png_textp text_ptr;
png_charp text;
png_charp key;
+ int ret;
if (png_ptr->buffer_size < 4)
{
@@ -1060,15 +1116,15 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
#endif
key = png_ptr->current_text;
- png_ptr->current_text = 0;
for (text = key; *text; text++)
/* empty loop */ ;
- if (text != key + png_ptr->current_text_size)
+ if (text < key + png_ptr->current_text_size)
text++;
- text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
+ text_ptr = (png_textp)png_malloc(png_ptr,
+ (png_uint_32)png_sizeof(png_text));
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
text_ptr->key = key;
#ifdef PNG_iTXt_SUPPORTED
@@ -1077,10 +1133,14 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
#endif
text_ptr->text = text;
- png_set_text(png_ptr, info_ptr, text_ptr, 1);
+ ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, key);
png_free(png_ptr, text_ptr);
+ png_ptr->current_text = NULL;
+
+ if (ret)
+ png_warning(png_ptr, "Insufficient memory to store text chunk.");
}
}
#endif
@@ -1093,8 +1153,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place zTXt");
- /* to quiet some compiler warnings */
- if(info_ptr == NULL) return;
+ info_ptr = info_ptr; /* to quiet some compiler warnings */
}
#ifdef PNG_MAX_MALLOC_64K
@@ -1151,14 +1210,14 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
png_push_crc_finish(png_ptr);
key = png_ptr->current_text;
- png_ptr->current_text = 0;
for (text = key; *text; text++)
/* empty loop */ ;
/* zTXt can't have zero text */
- if (text == key + png_ptr->current_text_size)
+ if (text >= key + png_ptr->current_text_size)
{
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
return;
}
@@ -1167,6 +1226,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
{
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
return;
}
@@ -1191,6 +1251,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
{
inflateReset(&png_ptr->zstream);
png_ptr->zstream.avail_in = 0;
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
png_free(png_ptr, text);
return;
@@ -1244,16 +1305,19 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
if (ret != Z_STREAM_END)
{
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
png_free(png_ptr, text);
return;
}
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
key = text;
text += key_size;
- text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
+ text_ptr = (png_textp)png_malloc(png_ptr,
+ (png_uint_32)png_sizeof(png_text));
text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
text_ptr->key = key;
#ifdef PNG_iTXt_SUPPORTED
@@ -1262,10 +1326,13 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
#endif
text_ptr->text = text;
- png_set_text(png_ptr, info_ptr, text_ptr, 1);
+ ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, key);
png_free(png_ptr, text_ptr);
+
+ if (ret)
+ png_warning(png_ptr, "Insufficient memory to store text chunk.");
}
}
#endif
@@ -1278,8 +1345,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place iTXt");
- /* to quiet some compiler warnings */
- if(info_ptr == NULL) return;
+ info_ptr = info_ptr; /* to quiet some compiler warnings */
}
#ifdef PNG_MAX_MALLOC_64K
@@ -1326,6 +1392,7 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
png_charp lang;
png_charp lang_key;
png_charp text;
+ int ret;
if (png_ptr->buffer_size < 4)
{
@@ -1341,12 +1408,11 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
#endif
key = png_ptr->current_text;
- png_ptr->current_text = 0;
for (lang = key; *lang; lang++)
/* empty loop */ ;
- if (lang != key + png_ptr->current_text_size)
+ if (lang < key + png_ptr->current_text_size - 3)
lang++;
comp_flag = *lang++;
@@ -1356,13 +1422,18 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
/* empty loop */ ;
lang_key++; /* skip NUL separator */
- for (text = lang_key; *text; text++)
- /* empty loop */ ;
+ text=lang_key;
+ if (lang_key < key + png_ptr->current_text_size - 1)
+ {
+ for (; *text; text++)
+ /* empty loop */ ;
+ }
- if (text != key + png_ptr->current_text_size)
+ if (text < key + png_ptr->current_text_size)
text++;
- text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
+ text_ptr = (png_textp)png_malloc(png_ptr,
+ (png_uint_32)png_sizeof(png_text));
text_ptr->compression = comp_flag + 2;
text_ptr->key = key;
text_ptr->lang = lang;
@@ -1371,9 +1442,13 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
text_ptr->text_length = 0;
text_ptr->itxt_length = png_strlen(text);
- png_set_text(png_ptr, info_ptr, text_ptr, 1);
+ ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+
+ png_ptr->current_text = NULL;
png_free(png_ptr, text_ptr);
+ if (ret)
+ png_warning(png_ptr, "Insufficient memory to store iTXt chunk.");
}
}
#endif
@@ -1392,55 +1467,59 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
if (!(png_ptr->chunk_name[0] & 0x20))
{
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
- if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
- HANDLE_CHUNK_ALWAYS
+ if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+ PNG_HANDLE_CHUNK_ALWAYS
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
- && png_ptr->read_user_chunk_fn == NULL
+ && png_ptr->read_user_chunk_fn == NULL
#endif
- )
+ )
#endif
- png_chunk_error(png_ptr, "unknown critical chunk");
+ png_chunk_error(png_ptr, "unknown critical chunk");
- /* to quiet compiler warnings about unused info_ptr */
- if (info_ptr == NULL)
- return;
+ info_ptr = info_ptr; /* to quiet some compiler warnings */
}
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
{
- png_unknown_chunk chunk;
-
#ifdef PNG_MAX_MALLOC_64K
- if (length > (png_uint_32)65535L)
- {
- png_warning(png_ptr, "unknown chunk too large to fit in memory");
- skip = length - (png_uint_32)65535L;
- length = (png_uint_32)65535L;
- }
+ if (length > (png_uint_32)65535L)
+ {
+ png_warning(png_ptr, "unknown chunk too large to fit in memory");
+ skip = length - (png_uint_32)65535L;
+ length = (png_uint_32)65535L;
+ }
#endif
-
- png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
- chunk.data = (png_bytep)png_malloc(png_ptr, length);
- png_crc_read(png_ptr, chunk.data, length);
- chunk.size = length;
+ png_strncpy((png_charp)png_ptr->unknown_chunk.name,
+ (png_charp)png_ptr->chunk_name, 4);
+ png_ptr->unknown_chunk.name[4] = '\0';
+ png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
+ png_ptr->unknown_chunk.size = (png_size_t)length;
+ png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
- if(png_ptr->read_user_chunk_fn != NULL)
- {
- /* callback to user unknown chunk handler */
- if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
- {
- if (!(png_ptr->chunk_name[0] & 0x20))
- if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
- HANDLE_CHUNK_ALWAYS)
- png_chunk_error(png_ptr, "unknown critical chunk");
- }
- png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
- }
- else
+ if(png_ptr->read_user_chunk_fn != NULL)
+ {
+ /* callback to user unknown chunk handler */
+ int ret;
+ ret = (*(png_ptr->read_user_chunk_fn))
+ (png_ptr, &png_ptr->unknown_chunk);
+ if (ret < 0)
+ png_chunk_error(png_ptr, "error in user chunk");
+ if (ret == 0)
+ {
+ if (!(png_ptr->chunk_name[0] & 0x20))
+ if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+ PNG_HANDLE_CHUNK_ALWAYS)
+ png_chunk_error(png_ptr, "unknown critical chunk");
+ png_set_unknown_chunks(png_ptr, info_ptr,
+ &png_ptr->unknown_chunk, 1);
+ }
+ }
+#else
+ png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
#endif
- png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
- png_free(png_ptr, chunk.data);
+ png_free(png_ptr, png_ptr->unknown_chunk.data);
+ png_ptr->unknown_chunk.data = NULL;
}
else
#endif
@@ -1475,9 +1554,10 @@ png_progressive_combine_row (png_structp png_ptr,
png_bytep old_row, png_bytep new_row)
{
#ifdef PNG_USE_LOCAL_ARRAYS
- const int FARDATA png_pass_dsp_mask[7] =
+ PNG_CONST int FARDATA png_pass_dsp_mask[7] =
{0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
#endif
+ if(png_ptr == NULL) return;
if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */
png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
}
@@ -1487,6 +1567,7 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
png_progressive_end_ptr end_fn)
{
+ if(png_ptr == NULL) return;
png_ptr->info_fn = info_fn;
png_ptr->row_fn = row_fn;
png_ptr->end_fn = end_fn;
@@ -1497,6 +1578,7 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
png_voidp PNGAPI
png_get_progressive_ptr(png_structp png_ptr)
{
+ if(png_ptr == NULL) return (NULL);
return png_ptr->io_ptr;
}
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */