diff options
Diffstat (limited to 'png.c')
| -rw-r--r-- | png.c | 134 |
1 files changed, 123 insertions, 11 deletions
@@ -1,7 +1,7 @@ /* png.c - location for general purpose libpng functions * - * Last changed in libpng 1.2.30 [August 15, 2008] + * Last changed in libpng 1.2.34 [December 11, 2008] * For conditions of distribution and use, see copyright notice in png.h * Copyright (c) 1998-2008 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) @@ -13,7 +13,7 @@ #include "png.h" /* Generate a compiler error if there is an old png.h in the search path. */ -typedef version_1_0_41 Your_png_h_is_not_version_1_0_41; +typedef version_1_0_42rc01 Your_png_h_is_not_version_1_0_42rc01; /* Version information for C files. This had better match the version * string defined in png.h. */ @@ -93,7 +93,7 @@ void PNGAPI png_set_sig_bytes(png_structp png_ptr, int num_bytes) { if (png_ptr == NULL) return; - png_debug(1, "in png_set_sig_bytes\n"); + png_debug(1, "in png_set_sig_bytes"); if (num_bytes > 8) png_error(png_ptr, "Too many bytes for PNG signature."); @@ -240,7 +240,7 @@ png_create_info_struct(png_structp png_ptr) { png_infop info_ptr; - png_debug(1, "in png_create_info_struct\n"); + 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, @@ -265,7 +265,7 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) png_infop info_ptr = NULL; if (png_ptr == NULL) return; - png_debug(1, "in png_destroy_info_struct\n"); + png_debug(1, "in png_destroy_info_struct"); if (info_ptr_ptr != NULL) info_ptr = *info_ptr_ptr; @@ -304,7 +304,7 @@ png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) if (info_ptr == NULL) return; - png_debug(1, "in png_info_init_3\n"); + png_debug(1, "in png_info_init_3"); if (png_sizeof(png_info) > png_info_struct_size) { @@ -322,7 +322,7 @@ void PNGAPI png_data_freer(png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask) { - png_debug(1, "in png_data_freer\n"); + png_debug(1, "in png_data_freer"); if (png_ptr == NULL || info_ptr == NULL) return; if (freer == PNG_DESTROY_WILL_FREE_DATA) @@ -339,7 +339,7 @@ void PNGAPI png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num) { - png_debug(1, "in png_free_data\n"); + png_debug(1, "in png_free_data"); if (png_ptr == NULL || info_ptr == NULL) return; @@ -593,7 +593,7 @@ if (mask & PNG_FREE_ROWS) void /* PRIVATE */ png_info_destroy(png_structp png_ptr, png_infop info_ptr) { - png_debug(1, "in png_info_destroy\n"); + png_debug(1, "in png_info_destroy"); png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); @@ -632,7 +632,7 @@ png_get_io_ptr(png_structp png_ptr) void PNGAPI png_init_io(png_structp png_ptr, png_FILE_p fp) { - png_debug(1, "in png_init_io\n"); + png_debug(1, "in png_init_io"); if (png_ptr == NULL) return; png_ptr->io_ptr = (png_voidp)fp; } @@ -694,7 +694,7 @@ 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 1.0.41 - October 31, 2008\n\ + return ((png_charp) "\n libpng version 1.0.42rc01 - December 11, 2008\n\ Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\ Copyright (c) 1996-1997 Andreas Dilger\n\ Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n"); @@ -796,4 +796,116 @@ png_convert_size(size_t size) return ((png_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) +/* + Multiply two 32-bit numbers, V1 and V2, using 32-bit + arithmetic, to produce a 64 bit result in the HI/LO words. + + A B + x C D + ------ + AD || BD +AC || CB || 0 + + where A and B are the high and low 16-bit words of V1, + C and D are the 16-bit words of V2, AD is the product of + A and D, and X || Y is (X << 16) + Y. +*/ + +void png_64bit_product (long v1, long v2, unsigned long *hi_product, + unsigned long *lo_product) +{ + int a, b, c, d; + long lo, hi, x, y; + + a = (v1 >> 16) & 0xffff; + b = v1 & 0xffff; + c = (v2 >> 16) & 0xffff; + d = v2 & 0xffff; + + lo = b * d; /* BD */ + x = a * d + c * b; /* AD + CB */ + y = ((lo >> 16) & 0xffff) + x; + + lo = (lo & 0xffff) | ((y & 0xffff) << 16); + hi = (y >> 16) & 0xffff; + + hi += a * c; /* AC */ + + *hi_product = (unsigned long)hi; + *lo_product = (unsigned long)lo; +} +int /* private */ +png_check_cHRM_fixed(png_structp png_ptr, + png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, + png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, + png_fixed_point blue_x, png_fixed_point blue_y) +{ + int ret = 1; + 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; + + if (white_x < 0 || white_y <= 0 || + red_x < 0 || red_y < 0 || + green_x < 0 || green_y < 0 || + blue_x < 0 || blue_y < 0) + { + png_warning(png_ptr, + "Ignoring attempt to set negative chromaticity value"); + ret = 0; + } + if (white_x > (png_fixed_point) PNG_UINT_31_MAX || + white_y > (png_fixed_point) PNG_UINT_31_MAX || + red_x > (png_fixed_point) PNG_UINT_31_MAX || + red_y > (png_fixed_point) PNG_UINT_31_MAX || + green_x > (png_fixed_point) PNG_UINT_31_MAX || + green_y > (png_fixed_point) PNG_UINT_31_MAX || + blue_x > (png_fixed_point) PNG_UINT_31_MAX || + blue_y > (png_fixed_point) PNG_UINT_31_MAX ) + { + png_warning(png_ptr, + "Ignoring attempt to set chromaticity value exceeding 21474.83"); + ret = 0; + } + if (white_x > 100000L - white_y) + { + png_warning(png_ptr, "Invalid cHRM white point"); + ret = 0; + } + if (red_x > 100000L - red_y) + { + png_warning(png_ptr, "Invalid cHRM red point"); + ret = 0; + } + if (green_x > 100000L - green_y) + { + png_warning(png_ptr, "Invalid cHRM green point"); + ret = 0; + } + if (blue_x > 100000L - blue_y) + { + png_warning(png_ptr, "Invalid cHRM blue point"); + ret = 0; + } + + png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo); + png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo); + + if (xy_hi == yx_hi && xy_lo == yx_lo) + { + png_warning(png_ptr, + "Ignoring attempt to set cHRM RGB triangle with zero area"); + ret = 0; + } + + return ret; +} +#endif /* NO_PNG_CHECK_cHRM */ +#endif /* PNG_cHRM_SUPPORTED */ #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |