diff options
Diffstat (limited to 'png.c')
| -rw-r--r-- | png.c | 230 |
1 files changed, 201 insertions, 29 deletions
@@ -1,7 +1,7 @@ /* png.c - location for general purpose libpng functions * - * Last changed in libpng 1.2.39 [August 13, 2009] + * Last changed in libpng 1.2.41 [November 18, 2009] * 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.) @@ -16,10 +16,11 @@ #include "png.h" /* Generate a compiler error if there is an old png.h in the search path. */ -typedef version_1_0_50 Your_png_h_is_not_version_1_0_50; +typedef version_1_0_51rc01 Your_png_h_is_not_version_1_0_51rc01; /* Version information for C files. This had better match the version - * string defined in png.h. */ + * string defined in png.h. + */ #ifdef PNG_USE_GLOBAL_ARRAYS /* png_libpng_ver was changed to a function in version 1.0.5c */ @@ -95,9 +96,11 @@ PNG_CONST int FARDATA png_pass_dsp_mask[] void PNGAPI png_set_sig_bytes(png_structp png_ptr, int num_bytes) { + png_debug(1, "in png_set_sig_bytes"); + if (png_ptr == NULL) return; - png_debug(1, "in png_set_sig_bytes"); + if (num_bytes > 8) png_error(png_ptr, "Too many bytes for PNG signature."); @@ -246,8 +249,10 @@ png_create_info_struct(png_structp png_ptr) png_infop info_ptr; png_debug(1, "in png_create_info_struct"); + if (png_ptr == NULL) return (NULL); + #ifdef PNG_USER_MEM_SUPPORTED info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, png_ptr->malloc_fn, png_ptr->mem_ptr); @@ -269,10 +274,12 @@ void PNGAPI png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) { png_infop info_ptr = NULL; + + png_debug(1, "in png_destroy_info_struct"); + if (png_ptr == NULL) return; - png_debug(1, "in png_destroy_info_struct"); if (info_ptr_ptr != NULL) info_ptr = *info_ptr_ptr; @@ -309,11 +316,11 @@ png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) { png_infop info_ptr = *ptr_ptr; + png_debug(1, "in png_info_init_3"); + if (info_ptr == NULL) return; - png_debug(1, "in png_info_init_3"); - if (png_sizeof(png_info) > png_info_struct_size) { png_destroy_struct(info_ptr); @@ -331,8 +338,10 @@ png_data_freer(png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask) { png_debug(1, "in png_data_freer"); + if (png_ptr == NULL || info_ptr == NULL) return; + if (freer == PNG_DESTROY_WILL_FREE_DATA) info_ptr->free_me |= mask; else if (freer == PNG_USER_WILL_FREE_DATA) @@ -348,10 +357,11 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num) { png_debug(1, "in png_free_data"); + if (png_ptr == NULL || info_ptr == NULL) return; -#if defined(PNG_TEXT_SUPPORTED) +#ifdef PNG_TEXT_SUPPORTED /* Free text item num or (if num == -1) all text items */ #ifdef PNG_FREE_ME_SUPPORTED if ((mask & PNG_FREE_TEXT) & info_ptr->free_me) @@ -379,7 +389,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, } #endif -#if defined(PNG_tRNS_SUPPORTED) +#ifdef PNG_tRNS_SUPPORTED /* Free any tRNS entry */ #ifdef PNG_FREE_ME_SUPPORTED if ((mask & PNG_FREE_TRNS) & info_ptr->free_me) @@ -396,7 +406,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, } #endif -#if defined(PNG_sCAL_SUPPORTED) +#ifdef PNG_sCAL_SUPPORTED /* Free any sCAL entry */ #ifdef PNG_FREE_ME_SUPPORTED if ((mask & PNG_FREE_SCAL) & info_ptr->free_me) @@ -414,7 +424,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, } #endif -#if defined(PNG_pCAL_SUPPORTED) +#ifdef PNG_pCAL_SUPPORTED /* Free any pCAL entry */ #ifdef PNG_FREE_ME_SUPPORTED if ((mask & PNG_FREE_PCAL) & info_ptr->free_me) @@ -441,7 +451,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, } #endif -#if defined(PNG_iCCP_SUPPORTED) +#ifdef PNG_iCCP_SUPPORTED /* Free any iCCP entry */ #ifdef PNG_FREE_ME_SUPPORTED if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) @@ -457,7 +467,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, } #endif -#if defined(PNG_sPLT_SUPPORTED) +#ifdef PNG_sPLT_SUPPORTED /* Free a given sPLT entry, or (if num == -1) all sPLT entries */ #ifdef PNG_FREE_ME_SUPPORTED if ((mask & PNG_FREE_SPLT) & info_ptr->free_me) @@ -492,7 +502,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, } #endif -#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) +#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED if (png_ptr->unknown_chunk.data) { png_free(png_ptr, png_ptr->unknown_chunk.data); @@ -530,7 +540,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, } #endif -#if defined(PNG_hIST_SUPPORTED) +#ifdef PNG_hIST_SUPPORTED /* Free any hIST entry */ #ifdef PNG_FREE_ME_SUPPORTED if ((mask & PNG_FREE_HIST) & info_ptr->free_me) @@ -563,7 +573,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, info_ptr->num_palette = 0; } -#if defined(PNG_INFO_IMAGE_SUPPORTED) +#ifdef PNG_INFO_IMAGE_SUPPORTED /* Free any image bits attached to the info structure */ #ifdef PNG_FREE_ME_SUPPORTED if ((mask & PNG_FREE_ROWS) & info_ptr->free_me) @@ -605,7 +615,7 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr) png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); -#if defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED if (png_ptr->num_chunk_list) { png_free(png_ptr, png_ptr->chunk_list); @@ -631,7 +641,7 @@ png_get_io_ptr(png_structp png_ptr) } #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) -#if !defined(PNG_NO_STDIO) +#ifdef PNG_STDIO_SUPPORTED /* Initialize the default input/output functions for the PNG file. If you * use your own read or write routines, you can call either png_set_read_fn() * or png_set_write_fn() instead of png_init_io(). If you have defined @@ -642,13 +652,15 @@ void PNGAPI png_init_io(png_structp png_ptr, png_FILE_p fp) { png_debug(1, "in png_init_io"); + if (png_ptr == NULL) return; + png_ptr->io_ptr = (png_voidp)fp; } #endif -#if defined(PNG_TIME_RFC1123_SUPPORTED) +#ifdef PNG_TIME_RFC1123_SUPPORTED /* Convert the supplied time into an RFC 1123 string suitable for use in * a "Creation Time" or other text-based time string. */ @@ -667,7 +679,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime) png_sizeof(char))); } -#if defined(_WIN32_WCE) +#ifdef _WIN32_WCE { wchar_t time_buf[29]; wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"), @@ -705,10 +717,23 @@ png_charp PNGAPI png_get_copyright(png_structp png_ptr) { png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ - return ((png_charp) "\n libpng version 1.0.50 - September 10, 2009\n\ - Copyright (c) 1998-2009 Glenn Randers-Pehrson\n\ - Copyright (c) 1996-1997 Andreas Dilger\n\ - Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n"); +#ifdef PNG_STRING_COPYRIGHT + return PNG_STRING_COPYRIGHT +#else +#ifdef __STDC__ + return ((png_charp) PNG_STRING_NEWLINE \ + "libpng version 1.0.51rc01 - November 18, 2009" PNG_STRING_NEWLINE \ + "Copyright (c) 1998-2009 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \ + "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \ + "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \ + PNG_STRING_NEWLINE); +#else + return ((png_charp) "libpng version 1.0.51rc01 - November 18, 2009\ + Copyright (c) 1998-2009 Glenn Randers-Pehrson\ + Copyright (c) 1996-1997 Andreas Dilger\ + Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc."); +#endif +#endif } /* The following return the library version as a short string in the @@ -740,11 +765,15 @@ png_get_header_version(png_structp png_ptr) { /* Returns longer string containing both version and date */ png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ +#ifdef __STDC__ return ((png_charp) PNG_HEADER_VERSION_STRING #ifndef PNG_READ_SUPPORTED " (NO READ SUPPORT)" #endif - "\n"); + PNG_STRING_NEWLINE); +#else + return ((png_charp) PNG_HEADER_VERSION_STRING); +#endif } #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) @@ -785,7 +814,7 @@ png_access_version_number(void) #if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) -#if !defined(PNG_1_0_X) +#ifndef PNG_1_0_X /* This function was added to libpng 1.2.0 */ int PNGAPI png_mmx_support(void) @@ -810,8 +839,8 @@ png_convert_size(size_t size) #endif /* PNG_SIZE_T */ /* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */ -#if defined(PNG_cHRM_SUPPORTED) -#if !defined(PNG_NO_CHECK_cHRM) +#ifdef PNG_cHRM_SUPPORTED +#ifdef PNG_CHECK_cHRM_SUPPORTED /* * Multiply two 32-bit numbers, V1 and V2, using 32-bit @@ -863,6 +892,7 @@ png_check_cHRM_fixed(png_structp png_ptr, unsigned long xy_hi,xy_lo,yx_hi,yx_lo; png_debug(1, "in function png_check_cHRM_fixed"); + if (png_ptr == NULL) return 0; @@ -921,6 +951,148 @@ png_check_cHRM_fixed(png_structp png_ptr, return ret; } -#endif /* NO_PNG_CHECK_cHRM */ +#endif /* PNG_CHECK_cHRM_SUPPORTED */ #endif /* PNG_cHRM_SUPPORTED */ + +void /* PRIVATE */ +png_check_IHDR(png_structp png_ptr, + png_uint_32 width, png_uint_32 height, int bit_depth, + int color_type, int interlace_type, int compression_type, + int filter_type) +{ + int error = 0; + + /* Check for width and height valid values */ + if (width == 0) + { + png_warning(png_ptr, "Image width is zero in IHDR"); + error = 1; + } + + if (height == 0) + { + png_warning(png_ptr, "Image height is zero in IHDR"); + error = 1; + } + +#ifdef PNG_SET_USER_LIMITS_SUPPORTED + if (width > png_ptr->user_width_max || width > PNG_USER_WIDTH_MAX) +#else + if (width > PNG_USER_WIDTH_MAX) +#endif + { + png_warning(png_ptr, "Image width exceeds user limit in IHDR"); + error = 1; + } + +#ifdef PNG_SET_USER_LIMITS_SUPPORTED + if (height > png_ptr->user_height_max || height > PNG_USER_HEIGHT_MAX) +#else + if (height > PNG_USER_HEIGHT_MAX) +#endif + { + png_warning(png_ptr, "Image height exceeds user limit in IHDR"); + error = 1; + } + + if (width > PNG_UINT_31_MAX) + { + png_warning(png_ptr, "Invalid image width in IHDR"); + error = 1; + } + + if ( height > PNG_UINT_31_MAX) + { + png_warning(png_ptr, "Invalid image height in IHDR"); + error = 1; + } + + if ( width > (PNG_UINT_32_MAX + >> 3) /* 8-byte RGBA pixels */ + - 64 /* bigrowbuf hack */ + - 1 /* filter byte */ + - 7*8 /* rounding of width to multiple of 8 pixels */ + - 8) /* extra max_pixel_depth pad */ + png_warning(png_ptr, "Width is too large for libpng to process pixels"); + + /* Check other values */ + if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 && + bit_depth != 8 && bit_depth != 16) + { + png_warning(png_ptr, "Invalid bit depth in IHDR"); + error = 1; + } + + if (color_type < 0 || color_type == 1 || + color_type == 5 || color_type > 6) + { + png_warning(png_ptr, "Invalid color type in IHDR"); + error = 1; + } + + if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) || + ((color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_GRAY_ALPHA || + color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8)) + { + png_warning(png_ptr, "Invalid color type/bit depth combination in IHDR"); + error = 1; + } + + if (interlace_type >= PNG_INTERLACE_LAST) + { + png_warning(png_ptr, "Unknown interlace method in IHDR"); + error = 1; + } + + if (compression_type != PNG_COMPRESSION_TYPE_BASE) + { + png_warning(png_ptr, "Unknown compression method in IHDR"); + error = 1; + } + +#ifdef PNG_MNG_FEATURES_SUPPORTED + /* Accept filter_method 64 (intrapixel differencing) only if + * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and + * 2. Libpng did not read a PNG signature (this filter_method is only + * used in PNG datastreams that are embedded in MNG datastreams) and + * 3. The application called png_permit_mng_features with a mask that + * included PNG_FLAG_MNG_FILTER_64 and + * 4. The filter_method is 64 and + * 5. The color_type is RGB or RGBA + */ + if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) && + png_ptr->mng_features_permitted) + png_warning(png_ptr, "MNG features are not allowed in a PNG datastream"); + + if (filter_type != PNG_FILTER_TYPE_BASE) + { + if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && + (filter_type == PNG_INTRAPIXEL_DIFFERENCING) && + ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) && + (color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_RGB_ALPHA))) + { + png_warning(png_ptr, "Unknown filter method in IHDR"); + error = 1; + } + + if (png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) + { + png_warning(png_ptr, "Invalid filter method in IHDR"); + error = 1; + } + } + +#else + if (filter_type != PNG_FILTER_TYPE_BASE) + { + png_warning(png_ptr, "Unknown filter method in IHDR"); + error = 1; + } +#endif + + if (error == 1) + png_error(png_ptr, "Invalid IHDR data"); +} #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |