X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/5b02c8a11f0e0d284eff32cfde1fcd2a4b2e659d..a43a9e5521440dbb28037646ed4a07125c8823a9:/src/png/pngread.c diff --git a/src/png/pngread.c b/src/png/pngread.c index 9f57e62f23..68b5858265 100644 --- a/src/png/pngread.c +++ b/src/png/pngread.c @@ -1,9 +1,9 @@ /* pngread.c - read a PNG file * - * libpng 1.2.6 - August 15, 2004 + * Last changed in libpng 1.2.30 [August 15, 2008] * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1998-2004 Glenn Randers-Pehrson + * Copyright (c) 1998-2008 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.) * @@ -13,6 +13,7 @@ #define PNG_INTERNAL #include "png.h" +#if defined(PNG_READ_SUPPORTED) /* Create a PNG structure for reading, and allocate any memory needed. */ png_structp PNGAPI @@ -33,6 +34,9 @@ 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; #ifdef PNG_SETJMP_SUPPORTED @@ -43,7 +47,7 @@ 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); @@ -53,12 +57,6 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, if (png_ptr == NULL) return (NULL); -#if !defined(PNG_1_0_X) -#ifdef PNG_ASSEMBLER_CODE_SUPPORTED - png_init_mmx_flags(png_ptr); /* 1.2.0 addition */ -#endif -#endif /* PNG_1_0_X */ - /* added at libpng-1.2.6 */ #ifdef PNG_SET_USER_LIMITS_SUPPORTED png_ptr->user_width_max=PNG_USER_WIDTH_MAX; @@ -73,9 +71,9 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, #endif { png_free(png_ptr, png_ptr->zbuf); - png_ptr->zbuf=NULL; + png_ptr->zbuf = NULL; #ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, + png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, (png_voidp)mem_ptr); #else png_destroy_struct((png_voidp)png_ptr); @@ -83,7 +81,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, return (NULL); } #ifdef USE_FAR_KEYWORD - png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf)); + png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); #endif #endif @@ -93,12 +91,18 @@ 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) { - if(user_png_ver[i] != png_libpng_ver[i]) + 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; - } while (png_libpng_ver[i++]); + if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) { @@ -115,16 +119,18 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, char msg[80]; if (user_png_ver) { - sprintf(msg, "Application was compiled with png.h from libpng-%.20s", + png_snprintf(msg, 80, + "Application was compiled with png.h from libpng-%.20s", user_png_ver); png_warning(png_ptr, msg); } - sprintf(msg, "Application is running with png.c from libpng-%.20s", + png_snprintf(msg, 80, + "Application is running with png.c from libpng-%.20s", png_libpng_ver); png_warning(png_ptr, msg); #endif #ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags=0; + png_ptr->flags = 0; #endif png_error(png_ptr, "Incompatible libpng version in application and library"); @@ -160,7 +166,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, #ifdef USE_FAR_KEYWORD if (setjmp(jmpbuf)) PNG_ABORT(); - png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf)); + png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); #else if (setjmp(png_ptr->jmpbuf)) PNG_ABORT(); @@ -169,9 +175,10 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, return (png_ptr); } +#if defined(PNG_1_0_X) || defined(PNG_1_2_X) /* Initialize PNG structure for reading, and allocate any memory needed. This interface is deprecated in favour of the png_create_read_struct(), - and it will eventually disappear. */ + and it will disappear as of libpng-1.3.0. */ #undef png_read_init void PNGAPI png_read_init(png_structp png_ptr) @@ -185,43 +192,47 @@ 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 (png_ptr == NULL) return; #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) - if(png_sizeof(png_struct) > png_struct_size || + if (png_sizeof(png_struct) > png_struct_size || png_sizeof(png_info) > png_info_size) { char msg[80]; - png_ptr->warning_fn=NULL; + png_ptr->warning_fn = NULL; if (user_png_ver) { - sprintf(msg, "Application was compiled with png.h from libpng-%.20s", + png_snprintf(msg, 80, + "Application was compiled with png.h from libpng-%.20s", user_png_ver); png_warning(png_ptr, msg); } - sprintf(msg, "Application is running with png.c from libpng-%.20s", + png_snprintf(msg, 80, + "Application is running with png.c from libpng-%.20s", png_libpng_ver); png_warning(png_ptr, msg); } #endif - if(png_sizeof(png_struct) > png_struct_size) + if (png_sizeof(png_struct) > png_struct_size) { - png_ptr->error_fn=NULL; + png_ptr->error_fn = NULL; #ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags=0; + png_ptr->flags = 0; #endif png_error(png_ptr, "The png struct allocated by the application for reading is too small."); } - if(png_sizeof(png_info) > png_info_size) + if (png_sizeof(png_info) > png_info_size) { - png_ptr->error_fn=NULL; + png_ptr->error_fn = NULL; #ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags=0; + 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); } +#endif /* PNG_1_0_X || PNG_1_2_X */ void PNGAPI png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, @@ -231,18 +242,20 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, jmp_buf tmp_jmp; /* to save current jump buffer */ #endif - int i=0; + int i = 0; png_structp png_ptr=*ptr_ptr; + if (png_ptr == NULL) return; + do { - if(user_png_ver[i] != png_libpng_ver[i]) + if (user_png_ver[i] != png_libpng_ver[i]) { #ifdef PNG_LEGACY_SUPPORTED png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; #else - png_ptr->warning_fn=NULL; + png_ptr->warning_fn = NULL; png_warning(png_ptr, "Application uses deprecated png_read_init() and should be recompiled."); break; @@ -250,26 +263,26 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, } } while (png_libpng_ver[i++]); - png_debug(1, "in png_read_init_3\n"); + png_debug(1, "in png_read_init_3"); #ifdef PNG_SETJMP_SUPPORTED /* save jump buffer and error functions */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf)); + png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); #endif - if(png_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; - } + if (png_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, png_sizeof (png_struct)); + png_memset(png_ptr, 0, png_sizeof(png_struct)); #ifdef PNG_SETJMP_SUPPORTED /* restore jump buffer */ - png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf)); + png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); #endif /* added at libpng-1.2.6 */ @@ -313,7 +326,8 @@ 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"); + if (png_ptr == NULL || info_ptr == NULL) return; + png_debug(1, "in png_read_info"); /* If we haven't checked all of the PNG signature bytes, do so now. */ if (png_ptr->sig_bytes < 8) { @@ -335,93 +349,88 @@ 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; + PNG_CONST PNG_IHDR; + PNG_CONST PNG_IDAT; + PNG_CONST PNG_IEND; + PNG_CONST PNG_PLTE; #if defined(PNG_READ_bKGD_SUPPORTED) - PNG_bKGD; + PNG_CONST PNG_bKGD; #endif #if defined(PNG_READ_cHRM_SUPPORTED) - PNG_cHRM; + PNG_CONST PNG_cHRM; #endif #if defined(PNG_READ_gAMA_SUPPORTED) - PNG_gAMA; + PNG_CONST PNG_gAMA; #endif #if defined(PNG_READ_hIST_SUPPORTED) - PNG_hIST; + PNG_CONST PNG_hIST; #endif #if defined(PNG_READ_iCCP_SUPPORTED) - PNG_iCCP; + PNG_CONST PNG_iCCP; #endif #if defined(PNG_READ_iTXt_SUPPORTED) - PNG_iTXt; + PNG_CONST PNG_iTXt; #endif #if defined(PNG_READ_oFFs_SUPPORTED) - PNG_oFFs; + PNG_CONST PNG_oFFs; #endif #if defined(PNG_READ_pCAL_SUPPORTED) - PNG_pCAL; + PNG_CONST PNG_pCAL; #endif #if defined(PNG_READ_pHYs_SUPPORTED) - PNG_pHYs; + PNG_CONST PNG_pHYs; #endif #if defined(PNG_READ_sBIT_SUPPORTED) - PNG_sBIT; + PNG_CONST PNG_sBIT; #endif #if defined(PNG_READ_sCAL_SUPPORTED) - PNG_sCAL; + PNG_CONST PNG_sCAL; #endif #if defined(PNG_READ_sPLT_SUPPORTED) - PNG_sPLT; + PNG_CONST PNG_sPLT; #endif #if defined(PNG_READ_sRGB_SUPPORTED) - PNG_sRGB; + PNG_CONST PNG_sRGB; #endif #if defined(PNG_READ_tEXt_SUPPORTED) - PNG_tEXt; + PNG_CONST PNG_tEXt; #endif #if defined(PNG_READ_tIME_SUPPORTED) - PNG_tIME; + PNG_CONST PNG_tIME; #endif #if defined(PNG_READ_tRNS_SUPPORTED) - PNG_tRNS; + PNG_CONST PNG_tRNS; #endif #if defined(PNG_READ_zTXt_SUPPORTED) - PNG_zTXt; + PNG_CONST PNG_zTXt; #endif -#endif /* PNG_GLOBAL_ARRAYS */ - png_byte chunk_length[4]; - png_uint_32 length; - - png_read_data(png_ptr, chunk_length, 4); - length = png_get_uint_31(png_ptr,chunk_length); - - png_reset_crc(png_ptr); - png_crc_read(png_ptr, png_ptr->chunk_name, 4); - - png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name, - length); +#endif /* PNG_USE_LOCAL_ARRAYS */ + 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"); @@ -432,9 +441,9 @@ 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"); @@ -447,71 +456,71 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) break; } #if defined(PNG_READ_bKGD_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + else if (!png_memcmp(chunk_name, png_iTXt, 4)) png_handle_iTXt(png_ptr, info_ptr, length); #endif else @@ -524,7 +533,8 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) 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 @@ -542,7 +552,8 @@ 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); } @@ -553,12 +564,14 @@ void PNGAPI png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) { #ifdef PNG_USE_LOCAL_ARRAYS - PNG_IDAT; - const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; - const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; + PNG_CONST PNG_IDAT; + PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, + 0xff}; + PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; #endif int ret; - png_debug2(1, "in png_read_row (row %lu, pass %d)\n", + if (png_ptr == NULL) return; + png_debug2(1, "in png_read_row (row %lu, pass %d)", png_ptr->row_number, png_ptr->pass); if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) png_read_start_row(png_ptr); @@ -683,15 +696,9 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) { 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_31(png_ptr,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"); } @@ -727,16 +734,16 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) 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) && + if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) { /* Intrapixel differencing */ @@ -744,7 +751,8 @@ 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) @@ -803,7 +811,7 @@ 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 1.2.6 + * [*] png_handle_alpha() does not exist yet, as of this version of libpng */ void PNGAPI @@ -814,7 +822,8 @@ 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) @@ -825,14 +834,14 @@ 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); rp++; } - else if(dp != NULL) + else if (dp != NULL) for (i = 0; i < num_rows; i++) { png_bytep dptr = *dp; @@ -853,16 +862,17 @@ 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 1.2.6 + * [*] 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); @@ -897,176 +907,166 @@ 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; + PNG_CONST PNG_IHDR; + PNG_CONST PNG_IDAT; + PNG_CONST PNG_IEND; + PNG_CONST PNG_PLTE; #if defined(PNG_READ_bKGD_SUPPORTED) - PNG_bKGD; + PNG_CONST PNG_bKGD; #endif #if defined(PNG_READ_cHRM_SUPPORTED) - PNG_cHRM; + PNG_CONST PNG_cHRM; #endif #if defined(PNG_READ_gAMA_SUPPORTED) - PNG_gAMA; + PNG_CONST PNG_gAMA; #endif #if defined(PNG_READ_hIST_SUPPORTED) - PNG_hIST; + PNG_CONST PNG_hIST; #endif #if defined(PNG_READ_iCCP_SUPPORTED) - PNG_iCCP; + PNG_CONST PNG_iCCP; #endif #if defined(PNG_READ_iTXt_SUPPORTED) - PNG_iTXt; + PNG_CONST PNG_iTXt; #endif #if defined(PNG_READ_oFFs_SUPPORTED) - PNG_oFFs; + PNG_CONST PNG_oFFs; #endif #if defined(PNG_READ_pCAL_SUPPORTED) - PNG_pCAL; + PNG_CONST PNG_pCAL; #endif #if defined(PNG_READ_pHYs_SUPPORTED) - PNG_pHYs; + PNG_CONST PNG_pHYs; #endif #if defined(PNG_READ_sBIT_SUPPORTED) - PNG_sBIT; + PNG_CONST PNG_sBIT; #endif #if defined(PNG_READ_sCAL_SUPPORTED) - PNG_sCAL; + PNG_CONST PNG_sCAL; #endif #if defined(PNG_READ_sPLT_SUPPORTED) - PNG_sPLT; + PNG_CONST PNG_sPLT; #endif #if defined(PNG_READ_sRGB_SUPPORTED) - PNG_sRGB; + PNG_CONST PNG_sRGB; #endif #if defined(PNG_READ_tEXt_SUPPORTED) - PNG_tEXt; + PNG_CONST PNG_tEXt; #endif #if defined(PNG_READ_tIME_SUPPORTED) - PNG_tIME; + PNG_CONST PNG_tIME; #endif #if defined(PNG_READ_tRNS_SUPPORTED) - PNG_tRNS; + PNG_CONST PNG_tRNS; #endif #if defined(PNG_READ_zTXt_SUPPORTED) - PNG_zTXt; + PNG_CONST PNG_zTXt; #endif -#endif /* PNG_GLOBAL_ARRAYS */ - - png_read_data(png_ptr, chunk_length, 4); - length = png_get_uint_31(png_ptr,chunk_length); - - png_reset_crc(png_ptr); - png_crc_read(png_ptr, png_ptr->chunk_name, 4); +#endif /* PNG_USE_LOCAL_ARRAYS */ + 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 (!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) + if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) png_error(png_ptr, "Too many IDAT's found"); } - else - png_ptr->mode |= PNG_AFTER_IDAT; png_handle_unknown(png_ptr, info_ptr, length); - if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + 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) + if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) png_error(png_ptr, "Too many IDAT's found"); png_crc_finish(png_ptr, length); } - 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + 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)) + else if (!png_memcmp(chunk_name, png_iTXt, 4)) png_handle_iTXt(png_ptr, info_ptr, length); #endif else @@ -1083,13 +1083,20 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_structp png_ptr = NULL; png_infop info_ptr = NULL, end_info_ptr = NULL; #ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn; - png_voidp mem_ptr; + png_free_ptr free_fn = NULL; + 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; @@ -1097,11 +1104,6 @@ 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) @@ -1159,7 +1161,7 @@ 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); @@ -1169,6 +1171,7 @@ 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); + png_free(png_ptr, png_ptr->chunkdata); #if defined(PNG_READ_DITHER_SUPPORTED) png_free(png_ptr, png_ptr->palette_lookup); png_free(png_ptr, png_ptr->dither_index); @@ -1265,7 +1268,7 @@ 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, png_sizeof (jmp_buf)); + png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); #endif error_fn = png_ptr->error_fn; @@ -1275,7 +1278,7 @@ 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, png_sizeof (png_struct)); + png_memset(png_ptr, 0, png_sizeof(png_struct)); png_ptr->error_fn = error_fn; png_ptr->warning_fn = warning_fn; @@ -1285,7 +1288,7 @@ 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, png_sizeof (jmp_buf)); + png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); #endif } @@ -1293,6 +1296,7 @@ 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; } @@ -1306,6 +1310,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, { int row; + if (png_ptr == NULL) return; #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) /* invert the alpha channel from opacity to transparency */ @@ -1318,7 +1323,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, */ 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()"); + png_error(png_ptr, "Image is too high to process with png_read_png()"); /* -------------- image transformations start here ------------------- */ @@ -1425,7 +1430,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, #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) { info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, info_ptr->height * png_sizeof(png_bytep)); @@ -1445,9 +1450,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ png_read_end(png_ptr, info_ptr); - if(transforms == 0 || params == NULL) - /* quiet compiler warnings */ return; + transforms = transforms; /* quiet compiler warnings */ + params = params; } -#endif +#endif /* PNG_INFO_IMAGE_SUPPORTED */ #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED */