/* pngread.c - read a PNG file
*
- * libpng 1.2.5rc3 - September 18, 2002
+ * Last changed in libpng 1.2.19 August 19, 2007
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2002 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.)
*
#define PNG_INTERNAL
#include "png.h"
+#if defined(PNG_READ_SUPPORTED)
+
/* Create a PNG structure for reading, and allocate any memory needed. */
png_structp PNGAPI
png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
if (png_ptr == NULL)
return (NULL);
-#if !defined(PNG_1_0_X)
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
- png_init_mmx_flags(png_ptr); /* 1.2.0 addition */
+ /* 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
-#endif /* PNG_1_0_X */
#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
png_free(png_ptr, png_ptr->zbuf);
png_ptr->zbuf=NULL;
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2((png_voidp)png_ptr,
+ png_destroy_struct_2((png_voidp)png_ptr,
(png_free_ptr)free_fn, (png_voidp)mem_ptr);
#else
png_destroy_struct((png_voidp)png_ptr);
return (NULL);
}
#ifdef USE_FAR_KEYWORD
- png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+ png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
#endif
#endif
char msg[80];
if (user_png_ver)
{
- sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+ png_snprintf(msg, 80,
+ "Application was compiled with png.h from libpng-%.20s",
user_png_ver);
png_warning(png_ptr, msg);
}
- sprintf(msg, "Application is running with png.c from libpng-%.20s",
+ png_snprintf(msg, 80,
+ "Application is running with png.c from libpng-%.20s",
png_libpng_ver);
png_warning(png_ptr, msg);
#endif
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
PNG_ABORT();
- png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+ png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
#else
if (setjmp(png_ptr->jmpbuf))
PNG_ABORT();
return (png_ptr);
}
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
/* Initialize PNG structure for reading, and allocate any memory needed.
This interface is deprecated in favour of the png_create_read_struct(),
- and it will eventually disappear. */
+ and it will disappear as of libpng-1.3.0. */
#undef png_read_init
void PNGAPI
png_read_init(png_structp png_ptr)
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 !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
- if(sizeof(png_struct) > png_struct_size || sizeof(png_info) > png_info_size)
+ if(png_sizeof(png_struct) > png_struct_size ||
+ png_sizeof(png_info) > png_info_size)
{
char msg[80];
png_ptr->warning_fn=NULL;
if (user_png_ver)
{
- sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+ png_snprintf(msg, 80,
+ "Application was compiled with png.h from libpng-%.20s",
user_png_ver);
png_warning(png_ptr, msg);
}
- sprintf(msg, "Application is running with png.c from libpng-%.20s",
+ png_snprintf(msg, 80,
+ "Application is running with png.c from libpng-%.20s",
png_libpng_ver);
png_warning(png_ptr, msg);
}
#endif
- if(sizeof(png_struct) > png_struct_size)
+ if(png_sizeof(png_struct) > png_struct_size)
{
png_ptr->error_fn=NULL;
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
png_error(png_ptr,
"The png struct allocated by the application for reading is too small.");
}
- if(sizeof(png_info) > png_info_size)
+ if(png_sizeof(png_info) > png_info_size)
{
png_ptr->error_fn=NULL;
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
}
png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
}
+#endif /* PNG_1_0_X || PNG_1_2_X */
void PNGAPI
png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
png_structp png_ptr=*ptr_ptr;
+ if(png_ptr == NULL) return;
+
do
{
if(user_png_ver[i] != png_libpng_ver[i])
#ifdef PNG_SETJMP_SUPPORTED
/* save jump buffer and error functions */
- png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+ png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
#endif
- if(sizeof(png_struct) > png_struct_size)
+ if(png_sizeof(png_struct) > png_struct_size)
{
png_destroy_struct(png_ptr);
*ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
}
/* reset all variables to 0 */
- png_memset(png_ptr, 0, sizeof (png_struct));
+ png_memset(png_ptr, 0, png_sizeof (png_struct));
#ifdef PNG_SETJMP_SUPPORTED
/* restore jump buffer */
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+ png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+#endif
+
+ /* 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 */
png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
}
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
/* Read the information before the actual image data. This has been
* changed in v0.90 to allow reading a file that already has the magic
* bytes read from the stream. You can tell libpng how many bytes have
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 we haven't checked all of the PNG signature bytes, do so now. */
if (png_ptr->sig_bytes < 8)
for(;;)
{
#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_sPLT_SUPPORTED)
- PNG_sPLT;
+ PNG_CONST PNG_sPLT;
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
- PNG_sRGB;
+ PNG_CONST PNG_sRGB;
#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_GLOBAL_ARRAYS */
+#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_32(chunk_length);
+ 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);
- if (length > PNG_MAX_UINT)
- png_error(png_ptr, "Invalid chunk length.");
-
/* 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_bytep)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))
png_handle_IHDR(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
png_handle_unknown(png_ptr, info_ptr, length);
}
}
+#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
/* 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;
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
else
png_read_transform_info(png_ptr, info_ptr);
}
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
/* Initialize palette, background, etc, after transformations
* are set, but before any reading takes place. This allows
* the user to obtain a gamma-corrected palette, for example.
png_start_read_image(png_structp png_ptr)
{
png_debug(1, "in png_start_read_image\n");
+ if(png_ptr == NULL) return;
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
}
+#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
void PNGAPI
png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
{
#ifdef PNG_USE_LOCAL_ARRAYS
- PNG_IDAT;
- const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
- const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+ PNG_CONST PNG_IDAT;
+ PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
+ 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",
png_ptr->row_number, png_ptr->pass);
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_crc_finish(png_ptr, 0);
png_read_data(png_ptr, chunk_length, 4);
- png_ptr->idat_size = png_get_uint_32(chunk_length);
-
- if (png_ptr->idat_size > PNG_MAX_UINT)
- png_error(png_ptr, "Invalid chunk length.");
+ 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->row_info.channels = png_ptr->channels;
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);
if(png_ptr->row_buf[0])
png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
png_ptr->rowbytes + 1);
-
+
#if defined(PNG_MNG_FEATURES_SUPPORTED)
if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
}
#endif
- 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)
if (png_ptr->read_row_fn != NULL)
(*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
}
+#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
/* Read one or more rows of image data. If the image is interlaced,
* and png_set_interlace_handling() has been called, the rows need to
* contain the contents of the rows from the previous pass. If the
* not called png_set_interlace_handling(), the display_row buffer will
* be ignored, so pass NULL to it.
*
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.5rc3
+ * [*] png_handle_alpha() does not exist yet, as of this version of libpng
*/
void PNGAPI
png_bytepp dp;
png_debug(1, "in png_read_rows\n");
+ if(png_ptr == NULL) return;
rp = row;
dp = display_row;
if (rp != NULL && dp != NULL)
dp++;
}
}
+#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
/* Read the entire image. If the image has an alpha channel or a tRNS
* chunk, and you have called png_handle_alpha()[*], you will need to
* initialize the image to the current image that PNG will be overlaying.
* only call this function once. If you desire to have an image for
* each pass of a interlaced image, use png_read_rows() instead.
*
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.5rc3
+ * [*] png_handle_alpha() does not exist yet, as of this version of libpng
*/
void PNGAPI
png_read_image(png_structp png_ptr, png_bytepp image)
png_bytepp rp;
png_debug(1, "in png_read_image\n");
+ if(png_ptr == NULL) return;
#ifdef PNG_READ_INTERLACING_SUPPORTED
pass = png_set_interlace_handling(png_ptr);
}
}
}
+#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
/* Read the end of the PNG file. Will not read past the end of the
* file, will verify the end is accurate, and will read any comments
* or time information at the end of the file, if info is not NULL.
png_uint_32 length;
png_debug(1, "in png_read_end\n");
+ if(png_ptr == NULL) return;
png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
do
{
#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_sPLT_SUPPORTED)
- PNG_sPLT;
+ PNG_CONST PNG_sPLT;
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
- PNG_sRGB;
+ PNG_CONST PNG_sRGB;
#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_GLOBAL_ARRAYS */
+#endif /* PNG_USE_LOCAL_ARRAYS */
png_read_data(png_ptr, chunk_length, 4);
- length = png_get_uint_32(chunk_length);
+ 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 (length > PNG_MAX_UINT)
- png_error(png_ptr, "Invalid chunk length.");
-
if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
{
if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
- if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
+ if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
png_error(png_ptr, "Too many IDAT's found");
}
- else
- png_ptr->mode |= PNG_AFTER_IDAT;
png_handle_unknown(png_ptr, info_ptr, length);
if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
/* Zero length IDATs are legal after the last IDAT has been
* read, but not after other chunks have been read.
*/
- if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
+ if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
png_error(png_ptr, "Too many IDAT's found");
png_crc_finish(png_ptr, length);
}
png_handle_unknown(png_ptr, info_ptr, length);
} while (!(png_ptr->mode & PNG_HAVE_IEND));
}
+#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
/* free all memory used by the read */
void PNGAPI
png_structp png_ptr = NULL;
png_infop info_ptr = NULL, end_info_ptr = NULL;
#ifdef PNG_USER_MEM_SUPPORTED
- png_free_ptr free_fn = NULL;
- png_voidp mem_ptr = NULL;
+ png_free_ptr free_fn;
+ png_voidp mem_ptr;
#endif
png_debug(1, "in png_destroy_read_struct\n");
* being used again.
*/
#ifdef PNG_SETJMP_SUPPORTED
- png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+ png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
#endif
error_fn = png_ptr->error_fn;
free_fn = png_ptr->free_fn;
#endif
- png_memset(png_ptr, 0, sizeof (png_struct));
+ png_memset(png_ptr, 0, png_sizeof (png_struct));
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
#endif
#ifdef PNG_SETJMP_SUPPORTED
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+ png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
#endif
}
void PNGAPI
png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
{
+ if(png_ptr == NULL) return;
png_ptr->read_row_fn = read_row_fn;
}
+
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
#if defined(PNG_INFO_IMAGE_SUPPORTED)
void PNGAPI
png_read_png(png_structp png_ptr, png_infop info_ptr,
{
int row;
+ 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);
#endif
- /* The call to png_read_info() gives us all of the information from the
+ /* png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk).
*/
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()");
/* -------------- image transformations start here ------------------- */
#if defined(PNG_READ_16_TO_8_SUPPORTED)
- /* tell libpng to strip 16 bit/color files down to 8 bits/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);
#endif
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
- /* Strip alpha bytes from the input data without combining with the
- * background (not recommended).
+ /* Strip alpha bytes from the input data without combining with
+ * the background (not recommended).
*/
if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
png_set_strip_alpha(png_ptr);
#endif
#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
- /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
+ /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
* byte into separate bytes (useful for paletted and grayscale images).
*/
if (transforms & PNG_TRANSFORM_PACKING)
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
/* Change the order of packed pixels to least significant bit first
- * (not useful if you are using png_set_packing). */
+ * (not useful if you are using png_set_packing).
+ */
if (transforms & PNG_TRANSFORM_PACKSWAP)
png_set_packswap(png_ptr);
#endif
png_set_expand(png_ptr);
#endif
- /* We don't handle background color or gamma transformation or dithering. */
+ /* We don't handle background color or gamma transformation or dithering.
+ */
#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);
#endif
#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);
#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);
#endif
if(info_ptr->row_pointers == NULL)
{
info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
- info_ptr->height * sizeof(png_bytep));
+ info_ptr->height * png_sizeof(png_bytep));
#ifdef PNG_FREE_ME_SUPPORTED
info_ptr->free_me |= PNG_FREE_ROWS;
#endif
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
- if(transforms == 0 || params == NULL)
- /* quiet compiler warnings */ return;
+ transforms = transforms; /* quiet compiler warnings */
+ params = params;
}
-#endif
+#endif /* PNG_INFO_IMAGE_SUPPORTED */
+#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED */
projects / wxWidgets.git / blobdiff