png.c revision 5821806d5e7f356e8fa4b058a389a808ea183019
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* png.c - location for general purpose libpng functions 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Last changed in libpng 1.2.43 [February 25, 2010] 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright (c) 1998-2010 Glenn Randers-Pehrson 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This code is released under the libpng license. 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * For conditions of distribution and use, see the disclaimer 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * and license in png.h 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define PNG_INTERNAL 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define PNG_NO_EXTERN 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define PNG_NO_PEDANTIC_WARNINGS 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "png.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Generate a compiler error if there is an old png.h in the search path. */ 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)typedef version_1_2_45 Your_png_h_is_not_version_1_2_45; 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Version information for C files. This had better match the version 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * string defined in png.h. 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_USE_GLOBAL_ARRAYS 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* png_libpng_ver was changed to a function in version 1.0.5c */ 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING; 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_READ_SUPPORTED 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* png_sig was changed to a function in version 1.0.5c */ 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Place to hold the signature string for a PNG file. */ 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_READ_SUPPORTED */ 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Invoke global declarations for constant strings for known chunk types */ 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_IHDR; 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_IDAT; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_IEND; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_PLTE; 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_bKGD; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_cHRM; 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_gAMA; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_hIST; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_iCCP; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_iTXt; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_oFFs; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_pCAL; 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_sCAL; 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_pHYs; 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_sBIT; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_sPLT; 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_sRGB; 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_tEXt; 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_tIME; 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_tRNS; 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_zTXt; 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_READ_SUPPORTED 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Start of interlace block */ 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Offset to next interlace block */ 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Start of interlace block in the y direction */ 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Offset to next interlace block in the y direction */ 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Height of interlace block. This is not currently used - if you need 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * it, uncomment it here and in png.h 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)*/ 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Mask to determine which pixels are valid in a pass */ 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_CONST int FARDATA png_pass_mask[] = 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Mask to determine which pixels to overwrite while displaying */ 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)PNG_CONST int FARDATA png_pass_dsp_mask[] 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_READ_SUPPORTED */ 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_USE_GLOBAL_ARRAYS */ 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Tells libpng that we have already handled the first "num_bytes" bytes 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * of the PNG file signature. If the PNG data is embedded into another 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * stream we can set num_bytes = 8 so that libpng will not attempt to read 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * or write any of the magic bytes before it starts on the IHDR. 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_READ_SUPPORTED 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void PNGAPI 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_set_sig_bytes(png_structp png_ptr, int num_bytes) 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_debug(1, "in png_set_sig_bytes"); 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL) 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (num_bytes > 8) 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_error(png_ptr, "Too many bytes for PNG signature."); 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes); 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Checks whether the supplied bytes match the PNG signature. We allow 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * checking less than the full 8-byte signature so that those apps that 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * already read the first few bytes of a file to determine the file type 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * can simply check the remaining bytes for extra assurance. Returns 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * an integer less than, equal to, or greater than zero if sig is found, 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * respectively, to be less than, to match, or be greater than the correct 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * PNG signature (this is the same behaviour as strcmp, memcmp, etc). 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int PNGAPI 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check) 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (num_to_check > 8) 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) num_to_check = 8; 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else if (num_to_check < 1) 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (-1); 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (start > 7) 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (-1); 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (start + num_to_check > 8) 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) num_to_check = 8 - start; 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(PNG_1_0_X) || defined(PNG_1_2_X) 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* (Obsolete) function to check signature bytes. It does not allow one 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * to check a partial signature. This function might be removed in the 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * future - use png_sig_cmp(). Returns true (nonzero) if the file is PNG. 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int PNGAPI 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_check_sig(png_bytep sig, int num) 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num)); 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_READ_SUPPORTED */ 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Function to allocate memory for zlib and clear it to 0. */ 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_1_0_X 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)voidpf PNGAPI 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)voidpf /* PRIVATE */ 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_zalloc(voidpf png_ptr, uInt items, uInt size) 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_voidp ptr; 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_structp p=(png_structp)png_ptr; 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_uint_32 save_flags=p->flags; 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_uint_32 num_bytes; 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL) 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (NULL); 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (items > PNG_UINT_32_MAX/size) 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning (p, "Potential overflow in png_zalloc()"); 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (NULL); 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) num_bytes = (png_uint_32)items * size; 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) p->flags=save_flags; 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO) 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (ptr == NULL) 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((voidpf)ptr); 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (num_bytes > (png_uint_32)0x8000L) 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_memset(ptr, 0, (png_size_t)0x8000L); 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0, 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (png_size_t)(num_bytes - (png_uint_32)0x8000L)); 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_memset(ptr, 0, (png_size_t)num_bytes); 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((voidpf)ptr); 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Function to free memory for zlib */ 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_1_0_X 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void PNGAPI 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void /* PRIVATE */ 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_zfree(voidpf png_ptr, voidpf ptr) 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free((png_structp)png_ptr, (png_voidp)ptr); 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Reset the CRC variable to 32 bits of 1's. Care must be taken 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * in case CRC is > 32 bits to leave the top bits 0. 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void /* PRIVATE */ 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_reset_crc(png_structp png_ptr) 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->crc = crc32(0, Z_NULL, 0); 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Calculate the CRC over a section of data. We can only pass as 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * much data to this routine as the largest single buffer size. We 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * also check that this data will actually be used before going to the 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * trouble of calculating it. 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void /* PRIVATE */ 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length) 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int need_crc = 1; 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) need_crc = 0; 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else /* critical */ 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) need_crc = 0; 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (need_crc) 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length); 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Allocate the memory for an info_struct for the application. We don't 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * really need the png_ptr, but it could potentially be useful in the 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * future. This should be used in favour of malloc(png_sizeof(png_info)) 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * and png_info_init() so that applications that want to use a shared 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * libpng don't have to be recompiled if png_info changes size. 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_infop PNGAPI 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_create_info_struct(png_structp png_ptr) 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_infop info_ptr; 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_debug(1, "in png_create_info_struct"); 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL) 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (NULL); 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_USER_MEM_SUPPORTED 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->malloc_fn, png_ptr->mem_ptr); 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); 2635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 2645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr != NULL) 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_info_init_3(&info_ptr, png_sizeof(png_info)); 2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (info_ptr); 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* This function frees the memory associated with a single info struct. 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Normally, one would use either png_destroy_read_struct() or 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * png_destroy_write_struct() to free an info struct, but this may be 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * useful for some applications. 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void PNGAPI 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_infop info_ptr = NULL; 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_debug(1, "in png_destroy_info_struct"); 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL) 2835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr_ptr != NULL) 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr = *info_ptr_ptr; 2875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr != NULL) 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 2905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_info_destroy(png_ptr, info_ptr); 2915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_USER_MEM_SUPPORTED 2935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn, 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->mem_ptr); 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_destroy_struct((png_voidp)info_ptr); 2975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 2985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *info_ptr_ptr = NULL; 2995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Initialize the info structure. This is now an internal function (0.89) 3035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * and applications using it are urged to use png_create_info_struct() 3045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * instead. 3055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 3065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(PNG_1_0_X) || defined(PNG_1_2_X) 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#undef png_info_init 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void PNGAPI 3095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_info_init(png_infop info_ptr) 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* We only come here via pre-1.0.12-compiled applications */ 3125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_info_init_3(&info_ptr, 0); 3135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 3155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void PNGAPI 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) 3185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 3195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_infop info_ptr = *ptr_ptr; 3205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_debug(1, "in png_info_init_3"); 3225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr == NULL) 3245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_sizeof(png_info) > png_info_struct_size) 3275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 3285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_destroy_struct(info_ptr); 3295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); 3305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *ptr_ptr = info_ptr; 3315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Set everything to 0 */ 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_memset(info_ptr, 0, png_sizeof(png_info)); 3355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 3385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void PNGAPI 3395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_data_freer(png_structp png_ptr, png_infop info_ptr, 3405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int freer, png_uint_32 mask) 3415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_debug(1, "in png_data_freer"); 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL || info_ptr == NULL) 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (freer == PNG_DESTROY_WILL_FREE_DATA) 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->free_me |= mask; 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else if (freer == PNG_USER_WILL_FREE_DATA) 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->free_me &= ~mask; 3515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 3525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, 3535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "Unknown freer parameter in png_data_freer."); 3545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 3565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void PNGAPI 3585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, 3595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int num) 3605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 3615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_debug(1, "in png_free_data"); 3625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL || info_ptr == NULL) 3645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_TEXT_SUPPORTED 3675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Free text item num or (if num == -1) all text items */ 3685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 3695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_TEXT) & info_ptr->free_me) 3705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 3715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mask & PNG_FREE_TEXT) 3725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 3735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 3745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (num != -1) 3755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 3765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr->text && info_ptr->text[num].key) 3775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 3785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->text[num].key); 3795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->text[num].key = NULL; 3805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 3835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 3845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int i; 3855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (i = 0; i < info_ptr->num_text; i++) 3865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i); 3875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->text); 3885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->text = NULL; 3895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->num_text=0; 3905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 3935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_tRNS_SUPPORTED 3955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Free any tRNS entry */ 3965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 3975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_TRNS) & info_ptr->free_me) 3985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 3995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS)) 4005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->trans); 4035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->trans = NULL; 4045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->valid &= ~PNG_INFO_tRNS; 4055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef PNG_FREE_ME_SUPPORTED 4065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; 4075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_sCAL_SUPPORTED 4125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Free any sCAL entry */ 4135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 4145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_SCAL) & info_ptr->free_me) 4155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 4165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mask & PNG_FREE_SCAL) 4175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) 4205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->scal_s_width); 4215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->scal_s_height); 4225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->scal_s_width = NULL; 4235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->scal_s_height = NULL; 4245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->valid &= ~PNG_INFO_sCAL; 4265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_pCAL_SUPPORTED 4305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Free any pCAL entry */ 4315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 4325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_PCAL) & info_ptr->free_me) 4335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 4345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mask & PNG_FREE_PCAL) 4355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->pcal_purpose); 4385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->pcal_units); 4395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->pcal_purpose = NULL; 4405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->pcal_units = NULL; 4415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr->pcal_params != NULL) 4425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int i; 4445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (i = 0; i < (int)info_ptr->pcal_nparams; i++) 4455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->pcal_params[i]); 4475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->pcal_params[i] = NULL; 4485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->pcal_params); 4505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->pcal_params = NULL; 4515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->valid &= ~PNG_INFO_pCAL; 4535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_iCCP_SUPPORTED 4575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Free any iCCP entry */ 4585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 4595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) 4605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 4615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mask & PNG_FREE_ICCP) 4625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->iccp_name); 4655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->iccp_profile); 4665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->iccp_name = NULL; 4675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->iccp_profile = NULL; 4685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->valid &= ~PNG_INFO_iCCP; 4695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_sPLT_SUPPORTED 4735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Free a given sPLT entry, or (if num == -1) all sPLT entries */ 4745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 4755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_SPLT) & info_ptr->free_me) 4765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 4775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mask & PNG_FREE_SPLT) 4785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 4795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (num != -1) 4815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr->splt_palettes) 4835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->splt_palettes[num].name); 4855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->splt_palettes[num].entries); 4865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->splt_palettes[num].name = NULL; 4875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->splt_palettes[num].entries = NULL; 4885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 4915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr->splt_palettes_num) 4935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int i; 4955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) 4965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i); 4975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->splt_palettes); 4995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->splt_palettes = NULL; 5005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->splt_palettes_num = 0; 5015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->valid &= ~PNG_INFO_sPLT; 5035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 5065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 5085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr->unknown_chunk.data) 5095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, png_ptr->unknown_chunk.data); 5115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->unknown_chunk.data = NULL; 5125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 5155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_UNKN) & info_ptr->free_me) 5165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 5175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mask & PNG_FREE_UNKN) 5185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 5195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (num != -1) 5215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr->unknown_chunks) 5235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->unknown_chunks[num].data); 5255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->unknown_chunks[num].data = NULL; 5265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 5295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int i; 5315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr->unknown_chunks_num) 5335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++) 5355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i); 5365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->unknown_chunks); 5385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->unknown_chunks = NULL; 5395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->unknown_chunks_num = 0; 5405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 5445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_hIST_SUPPORTED 5465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Free any hIST entry */ 5475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 5485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_HIST) & info_ptr->free_me) 5495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 5505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST)) 5515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 5525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->hist); 5545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->hist = NULL; 5555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->valid &= ~PNG_INFO_hIST; 5565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef PNG_FREE_ME_SUPPORTED 5575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->flags &= ~PNG_FLAG_FREE_HIST; 5585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 5595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 5615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Free any PLTE entry that was internally allocated */ 5635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 5645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_PLTE) & info_ptr->free_me) 5655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 5665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE)) 5675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 5685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_zfree(png_ptr, info_ptr->palette); 5705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->palette = NULL; 5715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->valid &= ~PNG_INFO_PLTE; 5725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef PNG_FREE_ME_SUPPORTED 5735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; 5745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 5755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->num_palette = 0; 5765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_INFO_IMAGE_SUPPORTED 5795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Free any image bits attached to the info structure */ 5805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 5815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((mask & PNG_FREE_ROWS) & info_ptr->free_me) 5825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 5835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mask & PNG_FREE_ROWS) 5845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 5855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info_ptr->row_pointers) 5875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int row; 5895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (row = 0; row < (int)info_ptr->height; row++) 5905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->row_pointers[row]); 5925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->row_pointers[row] = NULL; 5935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, info_ptr->row_pointers); 5955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->row_pointers = NULL; 5965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->valid &= ~PNG_INFO_IDAT; 5985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 6005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_FREE_ME_SUPPORTED 6025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (num == -1) 6035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->free_me &= ~mask; 6045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 6055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL); 6065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 6075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* This is an internal routine to free any memory that the info struct is 6105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * pointing to before re-using it or freeing the struct itself. Recall 6115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * that png_free() checks for NULL pointers for us. 6125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 6135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void /* PRIVATE */ 6145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_info_destroy(png_structp png_ptr, png_infop info_ptr) 6155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 6165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_debug(1, "in png_info_destroy"); 6175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); 6195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 6215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr->num_chunk_list) 6225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 6235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_free(png_ptr, png_ptr->chunk_list); 6245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->chunk_list = NULL; 6255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->num_chunk_list = 0; 6265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 6285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_info_init_3(&info_ptr, png_sizeof(png_info)); 6305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ 6325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* This function returns a pointer to the io_ptr associated with the user 6345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * functions. The application should free any memory associated with this 6355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * pointer before png_write_destroy() or png_read_destroy() are called. 6365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 6375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_voidp PNGAPI 6385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_get_io_ptr(png_structp png_ptr) 6395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 6405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL) 6415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (NULL); 6425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (png_ptr->io_ptr); 6435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) 6465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_STDIO_SUPPORTED 6475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Initialize the default input/output functions for the PNG file. If you 6485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * use your own read or write routines, you can call either png_set_read_fn() 6495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * or png_set_write_fn() instead of png_init_io(). If you have defined 6505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't 6515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * necessarily available. 6525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 6535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void PNGAPI 6545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_init_io(png_structp png_ptr, png_FILE_p fp) 6555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 6565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_debug(1, "in png_init_io"); 6575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL) 6595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 6605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->io_ptr = (png_voidp)fp; 6625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 6645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_TIME_RFC1123_SUPPORTED 6665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Convert the supplied time into an RFC 1123 string suitable for use in 6675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * a "Creation Time" or other text-based time string. 6685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 6695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_charp PNGAPI 6705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime) 6715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 6725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static PNG_CONST char short_months[12][4] = 6735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) {"Jan", "Feb", "Mar", "Apr", "May", "Jun", 6745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; 6755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL) 6775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (NULL); 6785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr->time_buffer == NULL) 6795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 6805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* 6815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_sizeof(char))); 6825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef _WIN32_WCE 6855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 6865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) wchar_t time_buf[29]; 6875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"), 6885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptime->day % 32, short_months[(ptime->month - 1) % 12], 6895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptime->year, ptime->hour % 24, ptime->minute % 60, 6905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptime->second % 61); 6915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 6925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 29, NULL, NULL); 6935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 6955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef USE_FAR_KEYWORD 6965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 6975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) char near_time_buf[29]; 6985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000", 6995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptime->day % 32, short_months[(ptime->month - 1) % 12], 7005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptime->year, ptime->hour % 24, ptime->minute % 60, 7015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptime->second % 61); 7025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_memcpy(png_ptr->time_buffer, near_time_buf, 7035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 29*png_sizeof(char)); 7045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 7065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000", 7075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptime->day % 32, short_months[(ptime->month - 1) % 12], 7085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptime->year, ptime->hour % 24, ptime->minute % 60, 7095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptime->second % 61); 7105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 7115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* _WIN32_WCE */ 7125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((png_charp)png_ptr->time_buffer); 7135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_TIME_RFC1123_SUPPORTED */ 7155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ 7175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_charp PNGAPI 7195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_get_copyright(png_structp png_ptr) 7205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 7215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ 7225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_STRING_COPYRIGHT 7235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return PNG_STRING_COPYRIGHT 7245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 7255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef __STDC__ 7265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((png_charp) PNG_STRING_NEWLINE \ 7275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "libpng version 1.2.45 - July 7, 2011" PNG_STRING_NEWLINE \ 7285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "Copyright (c) 1998-2010 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \ 7295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \ 7305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \ 7315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PNG_STRING_NEWLINE); 7325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 7335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((png_charp) "libpng version 1.2.45 - July 7, 2011\ 7345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Copyright (c) 1998-2010 Glenn Randers-Pehrson\ 7355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Copyright (c) 1996-1997 Andreas Dilger\ 7365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc."); 7375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 7385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 7395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* The following return the library version as a short string in the 7425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * format 1.0.0 through 99.99.99zz. To get the version of *.h files 7435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * used with your application, print out PNG_LIBPNG_VER_STRING, which 7445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * is defined in png.h. 7455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Note: now there is no difference between png_get_libpng_ver() and 7465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard, 7475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * it is guaranteed that png.c uses the correct version of png.h. 7485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 7495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_charp PNGAPI 7505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_get_libpng_ver(png_structp png_ptr) 7515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 7525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Version of *.c files used when building libpng */ 7535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ 7545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((png_charp) PNG_LIBPNG_VER_STRING); 7555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_charp PNGAPI 7585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_get_header_ver(png_structp png_ptr) 7595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 7605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Version of *.h files used when building libpng */ 7615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ 7625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((png_charp) PNG_LIBPNG_VER_STRING); 7635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_charp PNGAPI 7665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_get_header_version(png_structp png_ptr) 7675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 7685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Returns longer string containing both version and date */ 7695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ 7705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef __STDC__ 7715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((png_charp) PNG_HEADER_VERSION_STRING 7725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef PNG_READ_SUPPORTED 7735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) " (NO READ SUPPORT)" 7745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 7755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PNG_STRING_NEWLINE); 7765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 7775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((png_charp) PNG_HEADER_VERSION_STRING); 7785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 7795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) 7825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 7835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int PNGAPI 7845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name) 7855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 7865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Check chunk_name and return "keep" value if it's on the list, else 0 */ 7875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int i; 7885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_bytep p; 7895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0) 7905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; 7915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5; 7925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (i = png_ptr->num_chunk_list; i; i--, p -= 5) 7935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!png_memcmp(chunk_name, p, 4)) 7945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((int)*(p + 4)); 7955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; 7965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 7985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* This function, added to libpng-1.0.6g, is untested. */ 8005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int PNGAPI 8015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_reset_zstream(png_structp png_ptr) 8025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 8035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL) 8045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return Z_STREAM_ERROR; 8055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (inflateReset(&png_ptr->zstream)); 8065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ 8085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* This function was added to libpng-1.0.7 */ 8105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_uint_32 PNGAPI 8115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_access_version_number(void) 8125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 8135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Version of *.c files used when building libpng */ 8145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return((png_uint_32) PNG_LIBPNG_VER); 8155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) 8195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef PNG_1_0_X 8205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* This function was added to libpng 1.2.0 */ 8215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int PNGAPI 8225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_mmx_support(void) 8235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 8245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Obsolete, to be removed from libpng-1.4.0 */ 8255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return -1; 8265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_1_0_X */ 8285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */ 8295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) 8315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_SIZE_T 8325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Added at libpng version 1.2.6 */ 8335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); 8345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_size_t PNGAPI 8355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_convert_size(size_t size) 8365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 8375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (size > (png_size_t)-1) 8385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */ 8395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((png_size_t)size); 8405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_SIZE_T */ 8425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */ 8445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_cHRM_SUPPORTED 8455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_CHECK_cHRM_SUPPORTED 8465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 8485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Multiply two 32-bit numbers, V1 and V2, using 32-bit 8495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * arithmetic, to produce a 64 bit result in the HI/LO words. 8505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * A B 8525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * x C D 8535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ------ 8545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * AD || BD 8555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * AC || CB || 0 8565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * where A and B are the high and low 16-bit words of V1, 8585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * C and D are the 16-bit words of V2, AD is the product of 8595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * A and D, and X || Y is (X << 16) + Y. 8605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)*/ 8615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void /* PRIVATE */ 8635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_64bit_product (long v1, long v2, unsigned long *hi_product, 8645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned long *lo_product) 8655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 8665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int a, b, c, d; 8675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) long lo, hi, x, y; 8685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) a = (v1 >> 16) & 0xffff; 8705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) b = v1 & 0xffff; 8715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c = (v2 >> 16) & 0xffff; 8725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) d = v2 & 0xffff; 8735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) lo = b * d; /* BD */ 8755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) x = a * d + c * b; /* AD + CB */ 8765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) y = ((lo >> 16) & 0xffff) + x; 8775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) lo = (lo & 0xffff) | ((y & 0xffff) << 16); 8795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hi = (y >> 16) & 0xffff; 8805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hi += a * c; /* AC */ 8825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *hi_product = (unsigned long)hi; 8845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *lo_product = (unsigned long)lo; 8855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int /* PRIVATE */ 8885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_check_cHRM_fixed(png_structp png_ptr, 8895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, 8905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, 8915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_fixed_point blue_x, png_fixed_point blue_y) 8925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 8935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int ret = 1; 8945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned long xy_hi,xy_lo,yx_hi,yx_lo; 8955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_debug(1, "in function png_check_cHRM_fixed"); 8975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr == NULL) 8995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; 9005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (white_x < 0 || white_y <= 0 || 9025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) red_x < 0 || red_y < 0 || 9035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) green_x < 0 || green_y < 0 || 9045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) blue_x < 0 || blue_y < 0) 9055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, 9075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "Ignoring attempt to set negative chromaticity value"); 9085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ret = 0; 9095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (white_x > (png_fixed_point) PNG_UINT_31_MAX || 9115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) white_y > (png_fixed_point) PNG_UINT_31_MAX || 9125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) red_x > (png_fixed_point) PNG_UINT_31_MAX || 9135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) red_y > (png_fixed_point) PNG_UINT_31_MAX || 9145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) green_x > (png_fixed_point) PNG_UINT_31_MAX || 9155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) green_y > (png_fixed_point) PNG_UINT_31_MAX || 9165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) blue_x > (png_fixed_point) PNG_UINT_31_MAX || 9175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) blue_y > (png_fixed_point) PNG_UINT_31_MAX ) 9185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, 9205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "Ignoring attempt to set chromaticity value exceeding 21474.83"); 9215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ret = 0; 9225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (white_x > 100000L - white_y) 9245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid cHRM white point"); 9265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ret = 0; 9275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (red_x > 100000L - red_y) 9295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid cHRM red point"); 9315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ret = 0; 9325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (green_x > 100000L - green_y) 9345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid cHRM green point"); 9365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ret = 0; 9375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (blue_x > 100000L - blue_y) 9395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid cHRM blue point"); 9415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ret = 0; 9425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo); 9455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo); 9465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (xy_hi == yx_hi && xy_lo == yx_lo) 9485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, 9505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "Ignoring attempt to set cHRM RGB triangle with zero area"); 9515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ret = 0; 9525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ret; 9555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 9565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_CHECK_cHRM_SUPPORTED */ 9575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* PNG_cHRM_SUPPORTED */ 9585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void /* PRIVATE */ 9605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)png_check_IHDR(png_structp png_ptr, 9615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_uint_32 width, png_uint_32 height, int bit_depth, 9625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int color_type, int interlace_type, int compression_type, 9635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int filter_type) 9645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 9655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int error = 0; 9665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Check for width and height valid values */ 9685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (width == 0) 9695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Image width is zero in IHDR"); 9715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 9725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (height == 0) 9755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Image height is zero in IHDR"); 9775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 9785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_SET_USER_LIMITS_SUPPORTED 9815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (width > png_ptr->user_width_max || width > PNG_USER_WIDTH_MAX) 9825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 9835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (width > PNG_USER_WIDTH_MAX) 9845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 9855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Image width exceeds user limit in IHDR"); 9875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 9885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_SET_USER_LIMITS_SUPPORTED 9915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (height > png_ptr->user_height_max || height > PNG_USER_HEIGHT_MAX) 9925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 9935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (height > PNG_USER_HEIGHT_MAX) 9945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 9955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Image height exceeds user limit in IHDR"); 9975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 9985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (width > PNG_UINT_31_MAX) 10015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid image width in IHDR"); 10035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ( height > PNG_UINT_31_MAX) 10075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid image height in IHDR"); 10095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ( width > (PNG_UINT_32_MAX 10135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) >> 3) /* 8-byte RGBA pixels */ 10145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) - 64 /* bigrowbuf hack */ 10155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) - 1 /* filter byte */ 10165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) - 7*8 /* rounding of width to multiple of 8 pixels */ 10175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) - 8) /* extra max_pixel_depth pad */ 10185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Width is too large for libpng to process pixels"); 10195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Check other values */ 10215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 && 10225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bit_depth != 8 && bit_depth != 16) 10235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid bit depth in IHDR"); 10255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (color_type < 0 || color_type == 1 || 10295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) color_type == 5 || color_type > 6) 10305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid color type in IHDR"); 10325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) || 10365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ((color_type == PNG_COLOR_TYPE_RGB || 10375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) color_type == PNG_COLOR_TYPE_GRAY_ALPHA || 10385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8)) 10395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid color type/bit depth combination in IHDR"); 10415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (interlace_type >= PNG_INTERLACE_LAST) 10455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Unknown interlace method in IHDR"); 10475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (compression_type != PNG_COMPRESSION_TYPE_BASE) 10515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Unknown compression method in IHDR"); 10535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef PNG_MNG_FEATURES_SUPPORTED 10575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Accept filter_method 64 (intrapixel differencing) only if 10585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and 10595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 2. Libpng did not read a PNG signature (this filter_method is only 10605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * used in PNG datastreams that are embedded in MNG datastreams) and 10615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 3. The application called png_permit_mng_features with a mask that 10625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * included PNG_FLAG_MNG_FILTER_64 and 10635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 4. The filter_method is 64 and 10645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 5. The color_type is RGB or RGBA 10655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 10665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) && 10675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_ptr->mng_features_permitted) 10685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "MNG features are not allowed in a PNG datastream"); 10695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (filter_type != PNG_FILTER_TYPE_BASE) 10715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && 10735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (filter_type == PNG_INTRAPIXEL_DIFFERENCING) && 10745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) && 10755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (color_type == PNG_COLOR_TYPE_RGB || 10765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) color_type == PNG_COLOR_TYPE_RGB_ALPHA))) 10775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Unknown filter method in IHDR"); 10795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) 10835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Invalid filter method in IHDR"); 10855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 10905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (filter_type != PNG_FILTER_TYPE_BASE) 10915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_warning(png_ptr, "Unknown filter method in IHDR"); 10935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error = 1; 10945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 10965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (error == 1) 10985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) png_error(png_ptr, "Invalid IHDR data"); 10995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 11005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ 1101