X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/4946a942d77cf51e00aa56404756e124d7c11411..74a8f67d96591cec101def2a7d47c64072aff7fd:/src/png/pngread.c?ds=sidebyside diff --git a/src/png/pngread.c b/src/png/pngread.c index 24ddeb5c7b..92060d2bc6 100644 --- a/src/png/pngread.c +++ b/src/png/pngread.c @@ -1,18 +1,24 @@ /* pngread.c - read a PNG file * - * libpng 1.2.4 - July 8, 2002 - * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1998-2002 Glenn Randers-Pehrson + * Last changed in libpng 1.4.1 [February 25, 2010] + * Copyright (c) 1998-2010 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * * This file contains routines that an application calls directly to * read a PNG file or stream. */ -#define PNG_INTERNAL +#define PNG_NO_PEDANTIC_WARNINGS #include "png.h" +#ifdef PNG_READ_SUPPORTED +#include "pngpriv.h" + /* Create a PNG structure for reading, and allocate any memory needed. */ png_structp PNGAPI @@ -22,10 +28,12 @@ png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, #ifdef PNG_USER_MEM_SUPPORTED return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, - warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL)); + warn_fn, NULL, NULL, NULL)); } -/* Alternate create PNG structure for reading, and allocate any memory needed. */ +/* Alternate create PNG structure for reading, and allocate any memory + * needed. + */ png_structp PNGAPI png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, @@ -33,7 +41,11 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, { #endif /* PNG_USER_MEM_SUPPORTED */ +#ifdef PNG_SETJMP_SUPPORTED + volatile +#endif png_structp png_ptr; + volatile int png_cleanup_needed = 0; #ifdef PNG_SETJMP_SUPPORTED #ifdef USE_FAR_KEYWORD @@ -43,43 +55,45 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, int i; - png_debug(1, "in png_create_read_struct\n"); + png_debug(1, "in png_create_read_struct"); + #ifdef PNG_USER_MEM_SUPPORTED png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, - (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); + malloc_fn, mem_ptr); #else png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); #endif if (png_ptr == NULL) return (NULL); -#if !defined(PNG_1_0_X) -#ifdef PNG_ASSEMBLER_CODE_SUPPORTED - png_init_mmx_flags(png_ptr); /* 1.2.0 addition */ + /* Added at libpng-1.2.6 */ +#ifdef PNG_USER_LIMITS_SUPPORTED + png_ptr->user_width_max = PNG_USER_WIDTH_MAX; + png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; +# ifdef PNG_USER_CHUNK_CACHE_MAX + /* Added at libpng-1.2.43 and 1.4.0 */ + png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX; +# endif +# ifdef PNG_SET_USER_CHUNK_MALLOC_MAX + /* Added at libpng-1.2.43 and 1.4.1 */ + png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX; +# endif #endif -#endif /* PNG_1_0_X */ #ifdef PNG_SETJMP_SUPPORTED +/* Applications that neglect to set up their own setjmp() and then + encounter a png_error() will longjmp here. Since the jmpbuf is + then meaningless we abort instead of returning. */ #ifdef USE_FAR_KEYWORD if (setjmp(jmpbuf)) #else - if (setjmp(png_ptr->jmpbuf)) -#endif - { - png_free(png_ptr, png_ptr->zbuf); - png_ptr->zbuf=NULL; -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, - (png_free_ptr)free_fn, (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)png_ptr); + if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */ #endif - return (NULL); - } + PNG_ABORT(); #ifdef USE_FAR_KEYWORD - png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); -#endif + png_memcpy(png_jmpbuf(png_ptr), jmpbuf, png_sizeof(jmp_buf)); #endif +#endif /* PNG_SETJMP_SUPPORTED */ #ifdef PNG_USER_MEM_SUPPORTED png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); @@ -87,207 +101,107 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - i=0; - do - { - if(user_png_ver[i] != png_libpng_ver[i]) - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; - } while (png_libpng_ver[i++]); - - if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) + if (user_png_ver) { - /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so - * we must recompile any applications that use any older library version. - * For versions after libpng 1.0, we will be compatible, so we need - * only check the first digit. - */ - if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || - (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || - (user_png_ver[0] == '0' && user_png_ver[2] < '9')) - { -#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) - char msg[80]; - if (user_png_ver) - { - sprintf(msg, "Application was compiled with png.h from libpng-%.20s", - user_png_ver); - png_warning(png_ptr, msg); - } - sprintf(msg, "Application is running with png.c from libpng-%.20s", - png_libpng_ver); - png_warning(png_ptr, msg); + i = 0; + do + { + if (user_png_ver[i] != png_libpng_ver[i]) + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + } while (png_libpng_ver[i++]); + } + else + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + + + if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) + { + /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so + * we must recompile any applications that use any older library version. + * For versions after libpng 1.0, we will be compatible, so we need + * only check the first digit. + */ + if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || + (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || + (user_png_ver[0] == '0' && user_png_ver[2] < '9')) + { +#ifdef PNG_STDIO_SUPPORTED + char msg[80]; + if (user_png_ver) + { + png_snprintf(msg, 80, + "Application was compiled with png.h from libpng-%.20s", + user_png_ver); + png_warning(png_ptr, msg); + } + png_snprintf(msg, 80, + "Application is running with png.c from libpng-%.20s", + png_libpng_ver); + png_warning(png_ptr, msg); #endif #ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags=0; + png_ptr->flags = 0; #endif - png_error(png_ptr, - "Incompatible libpng version in application and library"); - } + png_warning(png_ptr, + "Incompatible libpng version in application and library"); + + png_cleanup_needed = 1; + } } - /* initialize zbuf - compression buffer */ + if (!png_cleanup_needed) + { + /* Initialize zbuf - compression buffer */ png_ptr->zbuf_size = PNG_ZBUF_SIZE; - png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, - (png_uint_32)png_ptr->zbuf_size); + png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, + png_ptr->zbuf_size); + if (png_ptr->zbuf == NULL) + png_cleanup_needed = 1; + } png_ptr->zstream.zalloc = png_zalloc; png_ptr->zstream.zfree = png_zfree; png_ptr->zstream.opaque = (voidpf)png_ptr; - switch (inflateInit(&png_ptr->zstream)) - { - case Z_OK: /* Do nothing */ break; - case Z_MEM_ERROR: - case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break; - case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break; - default: png_error(png_ptr, "Unknown zlib error"); - } - - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - - png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); - -#ifdef PNG_SETJMP_SUPPORTED -/* Applications that neglect to set up their own setjmp() and then encounter - a png_error() will longjmp here. Since the jmpbuf is then meaningless we - abort instead of returning. */ -#ifdef USE_FAR_KEYWORD - if (setjmp(jmpbuf)) - PNG_ABORT(); - png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); -#else - if (setjmp(png_ptr->jmpbuf)) - PNG_ABORT(); -#endif -#endif - return (png_ptr); -} - -/* Initialize PNG structure for reading, and allocate any memory needed. - This interface is deprecated in favour of the png_create_read_struct(), - and it will eventually disappear. */ -#undef png_read_init -void PNGAPI -png_read_init(png_structp png_ptr) -{ - /* We only come here via pre-1.0.7-compiled applications */ - png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0); -} - -void PNGAPI -png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver, - png_size_t png_struct_size, png_size_t png_info_size) -{ - /* We only come here via pre-1.0.12-compiled applications */ -#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) - if(sizeof(png_struct) > png_struct_size || sizeof(png_info) > png_info_size) + if (!png_cleanup_needed) { - char msg[80]; - png_ptr->warning_fn=NULL; - if (user_png_ver) + switch (inflateInit(&png_ptr->zstream)) { - sprintf(msg, "Application was compiled with png.h from libpng-%.20s", - user_png_ver); - png_warning(png_ptr, msg); + case Z_OK: /* Do nothing */ break; + case Z_MEM_ERROR: + case Z_STREAM_ERROR: png_warning(png_ptr, "zlib memory error"); + png_cleanup_needed = 1; break; + case Z_VERSION_ERROR: png_warning(png_ptr, "zlib version error"); + png_cleanup_needed = 1; break; + default: png_warning(png_ptr, "Unknown zlib error"); + png_cleanup_needed = 1; } - sprintf(msg, "Application is running with png.c from libpng-%.20s", - png_libpng_ver); - png_warning(png_ptr, msg); } -#endif - if(sizeof(png_struct) > png_struct_size) - { - png_ptr->error_fn=NULL; -#ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags=0; -#endif - png_error(png_ptr, - "The png struct allocated by the application for reading is too small."); - } - if(sizeof(png_info) > png_info_size) - { - png_ptr->error_fn=NULL; -#ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags=0; -#endif - png_error(png_ptr, - "The info struct allocated by application for reading is too small."); - } - png_read_init_3(&png_ptr, user_png_ver, png_struct_size); -} - -void PNGAPI -png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, - png_size_t png_struct_size) -{ -#ifdef PNG_SETJMP_SUPPORTED - jmp_buf tmp_jmp; /* to save current jump buffer */ -#endif - - int i=0; - - png_structp png_ptr=*ptr_ptr; - do + if (png_cleanup_needed) { - if(user_png_ver[i] != png_libpng_ver[i]) - { -#ifdef PNG_LEGACY_SUPPORTED - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + /* Clean up PNG structure and deallocate any memory. */ + png_free(png_ptr, png_ptr->zbuf); + png_ptr->zbuf = NULL; +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)png_ptr, + (png_free_ptr)free_fn, (png_voidp)mem_ptr); #else - png_ptr->warning_fn=NULL; - png_warning(png_ptr, - "Application uses deprecated png_read_init() and should be recompiled."); - break; -#endif - } - } while (png_libpng_ver[i++]); - - png_debug(1, "in png_read_init_3\n"); - -#ifdef PNG_SETJMP_SUPPORTED - /* save jump buffer and error functions */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); -#endif - - if(sizeof(png_struct) > png_struct_size) - { - png_destroy_struct(png_ptr); - *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); - png_ptr = *ptr_ptr; - } - - /* reset all variables to 0 */ - png_memset(png_ptr, 0, sizeof (png_struct)); - -#ifdef PNG_SETJMP_SUPPORTED - /* restore jump buffer */ - png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); + png_destroy_struct((png_voidp)png_ptr); #endif - - /* initialize zbuf - compression buffer */ - png_ptr->zbuf_size = PNG_ZBUF_SIZE; - png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, - (png_uint_32)png_ptr->zbuf_size); - png_ptr->zstream.zalloc = png_zalloc; - png_ptr->zstream.zfree = png_zfree; - png_ptr->zstream.opaque = (voidpf)png_ptr; - - switch (inflateInit(&png_ptr->zstream)) - { - case Z_OK: /* Do nothing */ break; - case Z_MEM_ERROR: - case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break; - case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break; - default: png_error(png_ptr, "Unknown zlib error"); + return (NULL); } png_ptr->zstream.next_out = png_ptr->zbuf; png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); + png_set_read_fn(png_ptr, NULL, NULL); + + + return (png_ptr); } + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the information before the actual image data. This has been * changed in v0.90 to allow reading a file that already has the magic * bytes read from the stream. You can tell libpng how many bytes have @@ -299,13 +213,21 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, void PNGAPI png_read_info(png_structp png_ptr, png_infop info_ptr) { - png_debug(1, "in png_read_info\n"); + png_debug(1, "in png_read_info"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + /* If we haven't checked all of the PNG signature bytes, do so now. */ if (png_ptr->sig_bytes < 8) { png_size_t num_checked = png_ptr->sig_bytes, num_to_check = 8 - num_checked; +#ifdef PNG_IO_STATE_SUPPORTED + png_ptr->io_state = PNG_IO_READING | PNG_IO_SIGNATURE; +#endif + png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); png_ptr->sig_bytes = 8; @@ -321,96 +243,86 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; } - for(;;) + for (;;) { -#ifdef PNG_USE_LOCAL_ARRAYS PNG_IHDR; PNG_IDAT; PNG_IEND; PNG_PLTE; -#if defined(PNG_READ_bKGD_SUPPORTED) +#ifdef PNG_READ_bKGD_SUPPORTED PNG_bKGD; #endif -#if defined(PNG_READ_cHRM_SUPPORTED) +#ifdef PNG_READ_cHRM_SUPPORTED PNG_cHRM; #endif -#if defined(PNG_READ_gAMA_SUPPORTED) +#ifdef PNG_READ_gAMA_SUPPORTED PNG_gAMA; #endif -#if defined(PNG_READ_hIST_SUPPORTED) +#ifdef PNG_READ_hIST_SUPPORTED PNG_hIST; #endif -#if defined(PNG_READ_iCCP_SUPPORTED) +#ifdef PNG_READ_iCCP_SUPPORTED PNG_iCCP; #endif -#if defined(PNG_READ_iTXt_SUPPORTED) +#ifdef PNG_READ_iTXt_SUPPORTED PNG_iTXt; #endif -#if defined(PNG_READ_oFFs_SUPPORTED) +#ifdef PNG_READ_oFFs_SUPPORTED PNG_oFFs; #endif -#if defined(PNG_READ_pCAL_SUPPORTED) +#ifdef PNG_READ_pCAL_SUPPORTED PNG_pCAL; #endif -#if defined(PNG_READ_pHYs_SUPPORTED) +#ifdef PNG_READ_pHYs_SUPPORTED PNG_pHYs; #endif -#if defined(PNG_READ_sBIT_SUPPORTED) +#ifdef PNG_READ_sBIT_SUPPORTED PNG_sBIT; #endif -#if defined(PNG_READ_sCAL_SUPPORTED) +#ifdef PNG_READ_sCAL_SUPPORTED PNG_sCAL; #endif -#if defined(PNG_READ_sPLT_SUPPORTED) +#ifdef PNG_READ_sPLT_SUPPORTED PNG_sPLT; #endif -#if defined(PNG_READ_sRGB_SUPPORTED) +#ifdef PNG_READ_sRGB_SUPPORTED PNG_sRGB; #endif -#if defined(PNG_READ_tEXt_SUPPORTED) +#ifdef PNG_READ_tEXt_SUPPORTED PNG_tEXt; #endif -#if defined(PNG_READ_tIME_SUPPORTED) +#ifdef PNG_READ_tIME_SUPPORTED PNG_tIME; #endif -#if defined(PNG_READ_tRNS_SUPPORTED) +#ifdef PNG_READ_tRNS_SUPPORTED PNG_tRNS; #endif -#if defined(PNG_READ_zTXt_SUPPORTED) +#ifdef PNG_READ_zTXt_SUPPORTED PNG_zTXt; #endif -#endif /* PNG_GLOBAL_ARRAYS */ - png_byte chunk_length[4]; - png_uint_32 length; - - png_read_data(png_ptr, chunk_length, 4); - length = png_get_uint_32(chunk_length); - - png_reset_crc(png_ptr); - png_crc_read(png_ptr, png_ptr->chunk_name, 4); - - png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name, - length); - - if (length > PNG_MAX_UINT) - png_error(png_ptr, "Invalid chunk length."); + png_uint_32 length = png_read_chunk_header(png_ptr); + PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; /* This should be a binary subdivision search or a hash for * matching the chunk name rather than a linear search. */ - if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) + if (!png_memcmp(chunk_name, png_IDAT, 4)) + if (png_ptr->mode & PNG_AFTER_IDAT) + png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; + + if (!png_memcmp(chunk_name, png_IHDR, 4)) png_handle_IHDR(png_ptr, info_ptr, length); - else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) + else if (!png_memcmp(chunk_name, png_IEND, 4)) png_handle_IEND(png_ptr, info_ptr, length); #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) + else if (png_handle_as_unknown(png_ptr, chunk_name)) { - if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + if (!png_memcmp(chunk_name, png_IDAT, 4)) png_ptr->mode |= PNG_HAVE_IDAT; png_handle_unknown(png_ptr, info_ptr, length); - if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + if (!png_memcmp(chunk_name, png_PLTE, 4)) png_ptr->mode |= PNG_HAVE_PLTE; - else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + else if (!png_memcmp(chunk_name, png_IDAT, 4)) { if (!(png_ptr->mode & PNG_HAVE_IHDR)) png_error(png_ptr, "Missing IHDR before IDAT"); @@ -421,9 +333,9 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) } } #endif - else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + else if (!png_memcmp(chunk_name, png_PLTE, 4)) png_handle_PLTE(png_ptr, info_ptr, length); - else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + else if (!png_memcmp(chunk_name, png_IDAT, 4)) { if (!(png_ptr->mode & PNG_HAVE_IHDR)) png_error(png_ptr, "Missing IHDR before IDAT"); @@ -435,92 +347,98 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) png_ptr->mode |= PNG_HAVE_IDAT; break; } -#if defined(PNG_READ_bKGD_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) +#ifdef PNG_READ_bKGD_SUPPORTED + else if (!png_memcmp(chunk_name, png_bKGD, 4)) png_handle_bKGD(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_cHRM_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) +#ifdef PNG_READ_cHRM_SUPPORTED + else if (!png_memcmp(chunk_name, png_cHRM, 4)) png_handle_cHRM(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_gAMA_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) +#ifdef PNG_READ_gAMA_SUPPORTED + else if (!png_memcmp(chunk_name, png_gAMA, 4)) png_handle_gAMA(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_hIST_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) +#ifdef PNG_READ_hIST_SUPPORTED + else if (!png_memcmp(chunk_name, png_hIST, 4)) png_handle_hIST(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_oFFs_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) +#ifdef PNG_READ_oFFs_SUPPORTED + else if (!png_memcmp(chunk_name, png_oFFs, 4)) png_handle_oFFs(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_pCAL_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) +#ifdef PNG_READ_pCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_pCAL, 4)) png_handle_pCAL(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_sCAL_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) +#ifdef PNG_READ_sCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_sCAL, 4)) png_handle_sCAL(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_pHYs_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) +#ifdef PNG_READ_pHYs_SUPPORTED + else if (!png_memcmp(chunk_name, png_pHYs, 4)) png_handle_pHYs(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_sBIT_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) +#ifdef PNG_READ_sBIT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sBIT, 4)) png_handle_sBIT(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_sRGB_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) +#ifdef PNG_READ_sRGB_SUPPORTED + else if (!png_memcmp(chunk_name, png_sRGB, 4)) png_handle_sRGB(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_iCCP_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) +#ifdef PNG_READ_iCCP_SUPPORTED + else if (!png_memcmp(chunk_name, png_iCCP, 4)) png_handle_iCCP(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_sPLT_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) +#ifdef PNG_READ_sPLT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sPLT, 4)) png_handle_sPLT(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_tEXt_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) +#ifdef PNG_READ_tEXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_tEXt, 4)) png_handle_tEXt(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_tIME_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) +#ifdef PNG_READ_tIME_SUPPORTED + else if (!png_memcmp(chunk_name, png_tIME, 4)) png_handle_tIME(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_tRNS_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) +#ifdef PNG_READ_tRNS_SUPPORTED + else if (!png_memcmp(chunk_name, png_tRNS, 4)) png_handle_tRNS(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_zTXt_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) +#ifdef PNG_READ_zTXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_zTXt, 4)) png_handle_zTXt(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_iTXt_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) +#ifdef PNG_READ_iTXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_iTXt, 4)) png_handle_iTXt(png_ptr, info_ptr, length); #endif else png_handle_unknown(png_ptr, info_ptr, length); } } +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ -/* optional call to update the users info_ptr structure */ +/* Optional call to update the users info_ptr structure */ void PNGAPI png_read_update_info(png_structp png_ptr, png_infop info_ptr) { - png_debug(1, "in png_read_update_info\n"); + png_debug(1, "in png_read_update_info"); + + if (png_ptr == NULL) + return; if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) png_read_start_row(png_ptr); else png_warning(png_ptr, "Ignoring extra png_read_update_info() call; row buffer not reallocated"); + png_read_transform_info(png_ptr, info_ptr); } +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Initialize palette, background, etc, after transformations * are set, but before any reading takes place. This allows * the user to obtain a gamma-corrected palette, for example. @@ -529,59 +447,69 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr) void PNGAPI png_start_read_image(png_structp png_ptr) { - png_debug(1, "in png_start_read_image\n"); + png_debug(1, "in png_start_read_image"); + + if (png_ptr == NULL) + return; if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) png_read_start_row(png_ptr); } +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED void PNGAPI png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) { -#ifdef PNG_USE_LOCAL_ARRAYS PNG_IDAT; - const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; - const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; -#endif + PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, + 0xff}; + PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; int ret; - png_debug2(1, "in png_read_row (row %lu, pass %d)\n", - png_ptr->row_number, png_ptr->pass); + + if (png_ptr == NULL) + return; + + png_debug2(1, "in png_read_row (row %lu, pass %d)", + (unsigned long) png_ptr->row_number, png_ptr->pass); + if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) png_read_start_row(png_ptr); if (png_ptr->row_number == 0 && png_ptr->pass == 0) { - /* check for transforms that have been set but were defined out */ + /* Check for transforms that have been set but were defined out */ #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED) if (png_ptr->transformations & PNG_INVERT_MONO) - png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined."); + png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined"); #endif #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED) if (png_ptr->transformations & PNG_FILLER) - png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined."); + png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined"); #endif -#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED) +#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \ + !defined(PNG_READ_PACKSWAP_SUPPORTED) if (png_ptr->transformations & PNG_PACKSWAP) - png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined."); + png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined"); #endif #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED) if (png_ptr->transformations & PNG_PACK) - png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined."); + png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined"); #endif #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) if (png_ptr->transformations & PNG_SHIFT) - png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined."); + png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined"); #endif #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED) if (png_ptr->transformations & PNG_BGR) - png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined."); + png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined"); #endif #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED) if (png_ptr->transformations & PNG_SWAP_BYTES) - png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined."); + png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined"); #endif } -#if defined(PNG_READ_INTERLACING_SUPPORTED) - /* if interlaced and we do not need a new row, combine row and return */ +#ifdef PNG_READ_INTERLACING_SUPPORTED + /* If interlaced and we do not need a new row, combine row and return */ if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) { switch (png_ptr->pass) @@ -661,25 +589,18 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) png_error(png_ptr, "Invalid attempt to read row data"); png_ptr->zstream.next_out = png_ptr->row_buf; - png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; + png_ptr->zstream.avail_out = + (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth, + png_ptr->iwidth) + 1); do { if (!(png_ptr->zstream.avail_in)) { while (!png_ptr->idat_size) { - png_byte chunk_length[4]; - png_crc_finish(png_ptr, 0); - png_read_data(png_ptr, chunk_length, 4); - png_ptr->idat_size = png_get_uint_32(chunk_length); - - if (png_ptr->idat_size > PNG_MAX_UINT) - png_error(png_ptr, "Invalid chunk length."); - - png_reset_crc(png_ptr); - png_crc_read(png_ptr, png_ptr->chunk_name, 4); + png_ptr->idat_size = png_read_chunk_header(png_ptr); if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) png_error(png_ptr, "Not enough image data"); } @@ -696,7 +617,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) { if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || png_ptr->idat_size) - png_error(png_ptr, "Extra compressed data"); + png_benign_error(png_ptr, "Extra compressed data"); png_ptr->mode |= PNG_AFTER_IDAT; png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; break; @@ -712,19 +633,18 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) png_ptr->row_info.channels = png_ptr->channels; png_ptr->row_info.bit_depth = png_ptr->bit_depth; png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; - png_ptr->row_info.rowbytes = ((png_ptr->row_info.width * - (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3); + png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, + png_ptr->row_info.width); - if(png_ptr->row_buf[0]) + if (png_ptr->row_buf[0]) png_read_filter_row(png_ptr, &(png_ptr->row_info), png_ptr->row_buf + 1, png_ptr->prev_row + 1, (int)(png_ptr->row_buf[0])); - png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, - png_ptr->rowbytes + 1); - -#if defined(PNG_MNG_FEATURES_SUPPORTED) - if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && + png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); + +#ifdef PNG_MNG_FEATURES_SUPPORTED + if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) { /* Intrapixel differencing */ @@ -732,19 +652,20 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) } #endif - if (png_ptr->transformations) + + if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) png_do_read_transformations(png_ptr); -#if defined(PNG_READ_INTERLACING_SUPPORTED) - /* blow up interlaced rows to full size */ +#ifdef PNG_READ_INTERLACING_SUPPORTED + /* Blow up interlaced rows to full size */ if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) { if (png_ptr->pass < 6) -/* old interface (pre-1.0.9): - png_do_read_interlace(&(png_ptr->row_info), - png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); - */ + /* Old interface (pre-1.0.9): + * png_do_read_interlace(&(png_ptr->row_info), + * png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); + */ png_do_read_interlace(png_ptr); if (dsp_row != NULL) @@ -767,7 +688,9 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if (png_ptr->read_row_fn != NULL) (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); } +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read one or more rows of image data. If the image is interlaced, * and png_set_interlace_handling() has been called, the rows need to * contain the contents of the rows from the previous pass. If the @@ -789,7 +712,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) * not called png_set_interlace_handling(), the display_row buffer will * be ignored, so pass NULL to it. * - * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.4 + * [*] png_handle_alpha() does not exist yet, as of this version of libpng */ void PNGAPI @@ -800,7 +723,10 @@ png_read_rows(png_structp png_ptr, png_bytepp row, png_bytepp rp; png_bytepp dp; - png_debug(1, "in png_read_rows\n"); + png_debug(1, "in png_read_rows"); + + if (png_ptr == NULL) + return; rp = row; dp = display_row; if (rp != NULL && dp != NULL) @@ -811,22 +737,24 @@ png_read_rows(png_structp png_ptr, png_bytepp row, png_read_row(png_ptr, rptr, dptr); } - else if(rp != NULL) + else if (rp != NULL) for (i = 0; i < num_rows; i++) { png_bytep rptr = *rp; - png_read_row(png_ptr, rptr, png_bytep_NULL); + png_read_row(png_ptr, rptr, NULL); rp++; } - else if(dp != NULL) + else if (dp != NULL) for (i = 0; i < num_rows; i++) { png_bytep dptr = *dp; - png_read_row(png_ptr, png_bytep_NULL, dptr); + png_read_row(png_ptr, NULL, dptr); dp++; } } +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the entire image. If the image has an alpha channel or a tRNS * chunk, and you have called png_handle_alpha()[*], you will need to * initialize the image to the current image that PNG will be overlaying. @@ -837,23 +765,26 @@ png_read_rows(png_structp png_ptr, png_bytepp row, * only call this function once. If you desire to have an image for * each pass of a interlaced image, use png_read_rows() instead. * - * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.4 + * [*] png_handle_alpha() does not exist yet, as of this version of libpng */ void PNGAPI png_read_image(png_structp png_ptr, png_bytepp image) { - png_uint_32 i,image_height; + png_uint_32 i, image_height; int pass, j; png_bytepp rp; - png_debug(1, "in png_read_image\n"); + png_debug(1, "in png_read_image"); + + if (png_ptr == NULL) + return; #ifdef PNG_READ_INTERLACING_SUPPORTED pass = png_set_interlace_handling(png_ptr); #else if (png_ptr->interlaced) png_error(png_ptr, - "Cannot read interlaced image -- interlace handler disabled."); + "Cannot read interlaced image -- interlace handler disabled"); pass = 1; #endif @@ -866,12 +797,14 @@ png_read_image(png_structp png_ptr, png_bytepp image) rp = image; for (i = 0; i < image_height; i++) { - png_read_row(png_ptr, *rp, png_bytep_NULL); + png_read_row(png_ptr, *rp, NULL); rp++; } } } +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the end of the PNG file. Will not read past the end of the * file, will verify the end is accurate, and will read any comments * or time information at the end of the file, if info is not NULL. @@ -879,187 +812,175 @@ png_read_image(png_structp png_ptr, png_bytepp image) void PNGAPI png_read_end(png_structp png_ptr, png_infop info_ptr) { - png_byte chunk_length[4]; - png_uint_32 length; - - png_debug(1, "in png_read_end\n"); + png_debug(1, "in png_read_end"); + + if (png_ptr == NULL) + return; png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ do { -#ifdef PNG_USE_LOCAL_ARRAYS PNG_IHDR; PNG_IDAT; PNG_IEND; PNG_PLTE; -#if defined(PNG_READ_bKGD_SUPPORTED) +#ifdef PNG_READ_bKGD_SUPPORTED PNG_bKGD; #endif -#if defined(PNG_READ_cHRM_SUPPORTED) +#ifdef PNG_READ_cHRM_SUPPORTED PNG_cHRM; #endif -#if defined(PNG_READ_gAMA_SUPPORTED) +#ifdef PNG_READ_gAMA_SUPPORTED PNG_gAMA; #endif -#if defined(PNG_READ_hIST_SUPPORTED) +#ifdef PNG_READ_hIST_SUPPORTED PNG_hIST; #endif -#if defined(PNG_READ_iCCP_SUPPORTED) +#ifdef PNG_READ_iCCP_SUPPORTED PNG_iCCP; #endif -#if defined(PNG_READ_iTXt_SUPPORTED) +#ifdef PNG_READ_iTXt_SUPPORTED PNG_iTXt; #endif -#if defined(PNG_READ_oFFs_SUPPORTED) +#ifdef PNG_READ_oFFs_SUPPORTED PNG_oFFs; #endif -#if defined(PNG_READ_pCAL_SUPPORTED) +#ifdef PNG_READ_pCAL_SUPPORTED PNG_pCAL; #endif -#if defined(PNG_READ_pHYs_SUPPORTED) +#ifdef PNG_READ_pHYs_SUPPORTED PNG_pHYs; #endif -#if defined(PNG_READ_sBIT_SUPPORTED) +#ifdef PNG_READ_sBIT_SUPPORTED PNG_sBIT; #endif -#if defined(PNG_READ_sCAL_SUPPORTED) +#ifdef PNG_READ_sCAL_SUPPORTED PNG_sCAL; #endif -#if defined(PNG_READ_sPLT_SUPPORTED) +#ifdef PNG_READ_sPLT_SUPPORTED PNG_sPLT; #endif -#if defined(PNG_READ_sRGB_SUPPORTED) +#ifdef PNG_READ_sRGB_SUPPORTED PNG_sRGB; #endif -#if defined(PNG_READ_tEXt_SUPPORTED) +#ifdef PNG_READ_tEXt_SUPPORTED PNG_tEXt; #endif -#if defined(PNG_READ_tIME_SUPPORTED) +#ifdef PNG_READ_tIME_SUPPORTED PNG_tIME; #endif -#if defined(PNG_READ_tRNS_SUPPORTED) +#ifdef PNG_READ_tRNS_SUPPORTED PNG_tRNS; #endif -#if defined(PNG_READ_zTXt_SUPPORTED) +#ifdef PNG_READ_zTXt_SUPPORTED PNG_zTXt; #endif -#endif /* PNG_GLOBAL_ARRAYS */ - - png_read_data(png_ptr, chunk_length, 4); - length = png_get_uint_32(chunk_length); - - png_reset_crc(png_ptr); - png_crc_read(png_ptr, png_ptr->chunk_name, 4); + png_uint_32 length = png_read_chunk_header(png_ptr); + PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; - png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name); - - if (length > PNG_MAX_UINT) - png_error(png_ptr, "Invalid chunk length."); - - if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) + if (!png_memcmp(chunk_name, png_IHDR, 4)) png_handle_IHDR(png_ptr, info_ptr, length); - else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) + else if (!png_memcmp(chunk_name, png_IEND, 4)) png_handle_IEND(png_ptr, info_ptr, length); #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) + else if (png_handle_as_unknown(png_ptr, chunk_name)) { - if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + if (!png_memcmp(chunk_name, png_IDAT, 4)) { - if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT) - png_error(png_ptr, "Too many IDAT's found"); + if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) + png_benign_error(png_ptr, "Too many IDATs found"); } - else - png_ptr->mode |= PNG_AFTER_IDAT; png_handle_unknown(png_ptr, info_ptr, length); - if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + if (!png_memcmp(chunk_name, png_PLTE, 4)) png_ptr->mode |= PNG_HAVE_PLTE; } #endif - else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + else if (!png_memcmp(chunk_name, png_IDAT, 4)) { /* Zero length IDATs are legal after the last IDAT has been * read, but not after other chunks have been read. */ - if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT) - png_error(png_ptr, "Too many IDAT's found"); + if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) + png_benign_error(png_ptr, "Too many IDATs found"); png_crc_finish(png_ptr, length); } - else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + else if (!png_memcmp(chunk_name, png_PLTE, 4)) png_handle_PLTE(png_ptr, info_ptr, length); -#if defined(PNG_READ_bKGD_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) +#ifdef PNG_READ_bKGD_SUPPORTED + else if (!png_memcmp(chunk_name, png_bKGD, 4)) png_handle_bKGD(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_cHRM_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) +#ifdef PNG_READ_cHRM_SUPPORTED + else if (!png_memcmp(chunk_name, png_cHRM, 4)) png_handle_cHRM(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_gAMA_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) +#ifdef PNG_READ_gAMA_SUPPORTED + else if (!png_memcmp(chunk_name, png_gAMA, 4)) png_handle_gAMA(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_hIST_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) +#ifdef PNG_READ_hIST_SUPPORTED + else if (!png_memcmp(chunk_name, png_hIST, 4)) png_handle_hIST(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_oFFs_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) +#ifdef PNG_READ_oFFs_SUPPORTED + else if (!png_memcmp(chunk_name, png_oFFs, 4)) png_handle_oFFs(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_pCAL_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) +#ifdef PNG_READ_pCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_pCAL, 4)) png_handle_pCAL(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_sCAL_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) +#ifdef PNG_READ_sCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_sCAL, 4)) png_handle_sCAL(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_pHYs_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) +#ifdef PNG_READ_pHYs_SUPPORTED + else if (!png_memcmp(chunk_name, png_pHYs, 4)) png_handle_pHYs(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_sBIT_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) +#ifdef PNG_READ_sBIT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sBIT, 4)) png_handle_sBIT(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_sRGB_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) +#ifdef PNG_READ_sRGB_SUPPORTED + else if (!png_memcmp(chunk_name, png_sRGB, 4)) png_handle_sRGB(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_iCCP_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) +#ifdef PNG_READ_iCCP_SUPPORTED + else if (!png_memcmp(chunk_name, png_iCCP, 4)) png_handle_iCCP(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_sPLT_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) +#ifdef PNG_READ_sPLT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sPLT, 4)) png_handle_sPLT(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_tEXt_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) +#ifdef PNG_READ_tEXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_tEXt, 4)) png_handle_tEXt(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_tIME_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) +#ifdef PNG_READ_tIME_SUPPORTED + else if (!png_memcmp(chunk_name, png_tIME, 4)) png_handle_tIME(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_tRNS_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) +#ifdef PNG_READ_tRNS_SUPPORTED + else if (!png_memcmp(chunk_name, png_tRNS, 4)) png_handle_tRNS(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_zTXt_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) +#ifdef PNG_READ_zTXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_zTXt, 4)) png_handle_zTXt(png_ptr, info_ptr, length); #endif -#if defined(PNG_READ_iTXt_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) +#ifdef PNG_READ_iTXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_iTXt, 4)) png_handle_iTXt(png_ptr, info_ptr, length); #endif else png_handle_unknown(png_ptr, info_ptr, length); } while (!(png_ptr->mode & PNG_HAVE_IEND)); } +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ -/* free all memory used by the read */ +/* Free all memory used by the read */ void PNGAPI png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr) @@ -1071,9 +992,17 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_voidp mem_ptr = NULL; #endif - png_debug(1, "in png_destroy_read_struct\n"); + png_debug(1, "in png_destroy_read_struct"); + if (png_ptr_ptr != NULL) png_ptr = *png_ptr_ptr; + if (png_ptr == NULL) + return; + +#ifdef PNG_USER_MEM_SUPPORTED + free_fn = png_ptr->free_fn; + mem_ptr = png_ptr->mem_ptr; +#endif if (info_ptr_ptr != NULL) info_ptr = *info_ptr_ptr; @@ -1081,16 +1010,11 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, if (end_info_ptr_ptr != NULL) end_info_ptr = *end_info_ptr_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - free_fn = png_ptr->free_fn; - mem_ptr = png_ptr->mem_ptr; -#endif - png_read_destroy(png_ptr, info_ptr, end_info_ptr); if (info_ptr != NULL) { -#if defined(PNG_TEXT_SUPPORTED) +#ifdef PNG_TEXT_SUPPORTED png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); #endif @@ -1105,7 +1029,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, if (end_info_ptr != NULL) { -#if defined(PNG_READ_TEXT_SUPPORTED) +#ifdef PNG_READ_TEXT_SUPPORTED png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); #endif #ifdef PNG_USER_MEM_SUPPORTED @@ -1129,9 +1053,10 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, } } -/* free all memory used by the read (old method) */ +/* Free all memory used by the read (old method) */ void /* PRIVATE */ -png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr) +png_read_destroy(png_structp png_ptr, png_infop info_ptr, + png_infop end_info_ptr) { #ifdef PNG_SETJMP_SUPPORTED jmp_buf tmp_jmp; @@ -1143,7 +1068,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr png_free_ptr free_fn; #endif - png_debug(1, "in png_read_destroy\n"); + png_debug(1, "in png_read_destroy"); + if (info_ptr != NULL) png_info_destroy(png_ptr, info_ptr); @@ -1153,50 +1079,33 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr png_free(png_ptr, png_ptr->zbuf); png_free(png_ptr, png_ptr->big_row_buf); png_free(png_ptr, png_ptr->prev_row); -#if defined(PNG_READ_DITHER_SUPPORTED) + png_free(png_ptr, png_ptr->chunkdata); +#ifdef PNG_READ_QUANTIZE_SUPPORTED png_free(png_ptr, png_ptr->palette_lookup); - png_free(png_ptr, png_ptr->dither_index); + png_free(png_ptr, png_ptr->quantize_index); #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED png_free(png_ptr, png_ptr->gamma_table); #endif -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED png_free(png_ptr, png_ptr->gamma_from_1); png_free(png_ptr, png_ptr->gamma_to_1); #endif -#ifdef PNG_FREE_ME_SUPPORTED if (png_ptr->free_me & PNG_FREE_PLTE) png_zfree(png_ptr, png_ptr->palette); png_ptr->free_me &= ~PNG_FREE_PLTE; -#else - if (png_ptr->flags & PNG_FLAG_FREE_PLTE) - png_zfree(png_ptr, png_ptr->palette); - png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; -#endif #if defined(PNG_tRNS_SUPPORTED) || \ defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) -#ifdef PNG_FREE_ME_SUPPORTED if (png_ptr->free_me & PNG_FREE_TRNS) - png_free(png_ptr, png_ptr->trans); + png_free(png_ptr, png_ptr->trans_alpha); png_ptr->free_me &= ~PNG_FREE_TRNS; -#else - if (png_ptr->flags & PNG_FLAG_FREE_TRNS) - png_free(png_ptr, png_ptr->trans); - png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; #endif -#endif -#if defined(PNG_READ_hIST_SUPPORTED) -#ifdef PNG_FREE_ME_SUPPORTED +#ifdef PNG_READ_hIST_SUPPORTED if (png_ptr->free_me & PNG_FREE_HIST) png_free(png_ptr, png_ptr->hist); png_ptr->free_me &= ~PNG_FREE_HIST; -#else - if (png_ptr->flags & PNG_FLAG_FREE_HIST) - png_free(png_ptr, png_ptr->hist); - png_ptr->flags &= ~PNG_FLAG_FREE_HIST; -#endif #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (png_ptr->gamma_16_table != NULL) { int i; @@ -1207,7 +1116,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr } png_free(png_ptr, png_ptr->gamma_16_table); } -#if defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_BACKGROUND_SUPPORTED if (png_ptr->gamma_16_from_1 != NULL) { int i; @@ -1230,7 +1139,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr } #endif #endif -#if defined(PNG_TIME_RFC1123_SUPPORTED) +#ifdef PNG_TIME_RFC1123_SUPPORTED png_free(png_ptr, png_ptr->time_buffer); #endif @@ -1249,7 +1158,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr * being used again. */ #ifdef PNG_SETJMP_SUPPORTED - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); + png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); #endif error_fn = png_ptr->error_fn; @@ -1259,7 +1168,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr free_fn = png_ptr->free_fn; #endif - png_memset(png_ptr, 0, sizeof (png_struct)); + png_memset(png_ptr, 0, png_sizeof(png_struct)); png_ptr->error_fn = error_fn; png_ptr->warning_fn = warning_fn; @@ -1269,7 +1178,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr #endif #ifdef PNG_SETJMP_SUPPORTED - png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); + png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); #endif } @@ -1277,10 +1186,14 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr void PNGAPI png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) { + if (png_ptr == NULL) + return; png_ptr->read_row_fn = read_row_fn; } -#if defined(PNG_INFO_IMAGE_SUPPORTED) + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +#ifdef PNG_INFO_IMAGE_SUPPORTED void PNGAPI png_read_png(png_structp png_ptr, png_infop info_ptr, int transforms, @@ -1288,70 +1201,73 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, { int row; -#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) - /* invert the alpha channel from opacity to transparency */ - if (transforms & PNG_TRANSFORM_INVERT_ALPHA) - png_set_invert_alpha(png_ptr); -#endif + if (png_ptr == NULL) + return; - /* The call to png_read_info() gives us all of the information from the + /* png_read_info() gives us all of the information from the * PNG file before the first IDAT (image data chunk). */ png_read_info(png_ptr, info_ptr); + if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) + png_error(png_ptr, "Image is too high to process with png_read_png()"); /* -------------- image transformations start here ------------------- */ -#if defined(PNG_READ_16_TO_8_SUPPORTED) - /* tell libpng to strip 16 bit/color files down to 8 bits/color */ +#ifdef PNG_READ_16_TO_8_SUPPORTED + /* Tell libpng to strip 16 bit/color files down to 8 bits per color. + */ if (transforms & PNG_TRANSFORM_STRIP_16) - png_set_strip_16(png_ptr); + png_set_strip_16(png_ptr); #endif -#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) - /* Strip alpha bytes from the input data without combining with the - * background (not recommended). +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED + /* Strip alpha bytes from the input data without combining with + * the background (not recommended). */ if (transforms & PNG_TRANSFORM_STRIP_ALPHA) - png_set_strip_alpha(png_ptr); + png_set_strip_alpha(png_ptr); #endif #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) - /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single + /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single * byte into separate bytes (useful for paletted and grayscale images). */ if (transforms & PNG_TRANSFORM_PACKING) - png_set_packing(png_ptr); + png_set_packing(png_ptr); #endif -#if defined(PNG_READ_PACKSWAP_SUPPORTED) +#ifdef PNG_READ_PACKSWAP_SUPPORTED /* Change the order of packed pixels to least significant bit first - * (not useful if you are using png_set_packing). */ + * (not useful if you are using png_set_packing). + */ if (transforms & PNG_TRANSFORM_PACKSWAP) - png_set_packswap(png_ptr); + png_set_packswap(png_ptr); #endif -#if defined(PNG_READ_EXPAND_SUPPORTED) +#ifdef PNG_READ_EXPAND_SUPPORTED /* Expand paletted colors into true RGB triplets * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel * Expand paletted or RGB images with transparency to full alpha * channels so the data will be available as RGBA quartets. */ if (transforms & PNG_TRANSFORM_EXPAND) - if ((png_ptr->bit_depth < 8) || - (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || - (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) + if ((png_ptr->bit_depth < 8) || + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || + (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) png_set_expand(png_ptr); #endif - /* We don't handle background color or gamma transformation or dithering. */ + /* We don't handle background color or gamma transformation or quantizing. + */ -#if defined(PNG_READ_INVERT_SUPPORTED) - /* invert monochrome files to have 0 as white and 1 as black */ +#ifdef PNG_READ_INVERT_SUPPORTED + /* Invert monochrome files to have 0 as white and 1 as black + */ if (transforms & PNG_TRANSFORM_INVERT_MONO) - png_set_invert_mono(png_ptr); + png_set_invert_mono(png_ptr); #endif -#if defined(PNG_READ_SHIFT_SUPPORTED) +#ifdef PNG_READ_SHIFT_SUPPORTED /* If you want to shift the pixel values from the range [0,255] or * [0,65535] to the original [0,7] or [0,31], or whatever range the * colors were originally in: @@ -1366,22 +1282,41 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, } #endif -#if defined(PNG_READ_BGR_SUPPORTED) - /* flip the RGB pixels to BGR (or RGBA to BGRA) */ +#ifdef PNG_READ_BGR_SUPPORTED + /* Flip the RGB pixels to BGR (or RGBA to BGRA) + */ if (transforms & PNG_TRANSFORM_BGR) - png_set_bgr(png_ptr); + png_set_bgr(png_ptr); #endif -#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) - /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */ +#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED + /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) + */ if (transforms & PNG_TRANSFORM_SWAP_ALPHA) png_set_swap_alpha(png_ptr); #endif -#if defined(PNG_READ_SWAP_SUPPORTED) - /* swap bytes of 16 bit files to least significant byte first */ +#ifdef PNG_READ_SWAP_SUPPORTED + /* Swap bytes of 16 bit files to least significant byte first + */ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) - png_set_swap(png_ptr); + png_set_swap(png_ptr); +#endif + +/* Added at libpng-1.2.41 */ +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED + /* Invert the alpha channel from opacity to transparency + */ + if (transforms & PNG_TRANSFORM_INVERT_ALPHA) + png_set_invert_alpha(png_ptr); +#endif + +/* Added at libpng-1.2.41 */ +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + /* Expand grayscale image to RGB + */ + if (transforms & PNG_TRANSFORM_GRAY_TO_RGB) + png_set_gray_to_rgb(png_ptr); #endif /* We don't handle adding filler bytes */ @@ -1394,31 +1329,33 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, /* -------------- image transformations end here ------------------- */ -#ifdef PNG_FREE_ME_SUPPORTED png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); -#endif - if(info_ptr->row_pointers == NULL) + if (info_ptr->row_pointers == NULL) { + png_uint_32 iptr; + info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, - info_ptr->height * sizeof(png_bytep)); -#ifdef PNG_FREE_ME_SUPPORTED + info_ptr->height * png_sizeof(png_bytep)); + for (iptr=0; iptrheight; iptr++) + info_ptr->row_pointers[iptr] = NULL; + info_ptr->free_me |= PNG_FREE_ROWS; -#endif + for (row = 0; row < (int)info_ptr->height; row++) - { info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr)); - } } png_read_image(png_ptr, info_ptr->row_pointers); info_ptr->valid |= PNG_INFO_IDAT; - /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ + /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */ png_read_end(png_ptr, info_ptr); - if(transforms == 0 || params == NULL) - /* quiet compiler warnings */ return; + transforms = transforms; /* Quiet compiler warnings */ + params = params; } -#endif +#endif /* PNG_INFO_IMAGE_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED */