From e4f15b0f0ecf2be2b1300edbf8ce78c2270c3b4d Mon Sep 17 00:00:00 2001 From: Glenn Randers-Pehrson Date: Sat, 17 Oct 2009 19:02:45 -0500 Subject: [PATCH] [master] Ported cosmetic changes to pngread.c from libpng-1.4.0beta87. --- pngread.c | 483 ++++++++++++++++++++++++++++-------------------------- 1 file changed, 249 insertions(+), 234 deletions(-) diff --git a/pngread.c b/pngread.c index a4cbb3e2..aab6f605 100644 --- a/pngread.c +++ b/pngread.c @@ -1,7 +1,7 @@ /* pngread.c - read a PNG file * - * Last changed in libpng 1.2.37 [June 4, 2009] + * Last changed in libpng 1.2.41 [October 17, 2009] * Copyright (c) 1998-2009 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) @@ -16,7 +16,8 @@ #define PNG_INTERNAL #include "png.h" -#if defined(PNG_READ_SUPPORTED) +#ifdef PNG_READ_SUPPORTED + /* Create a PNG structure for reading, and allocate any memory needed. */ png_structp PNGAPI @@ -51,6 +52,7 @@ 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"); + #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); @@ -86,7 +88,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, #ifdef USE_FAR_KEYWORD png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); #endif -#endif +#endif /* PNG_SETJMP_SUPPORTED */ #ifdef PNG_USER_MEM_SUPPORTED png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); @@ -96,48 +98,48 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, if (user_png_ver) { - 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; + 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')) - { + 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')) + { #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) - 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, + 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); + 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_error(png_ptr, + "Incompatible libpng version in application and library"); + } } /* Initialize zbuf - compression buffer */ @@ -148,14 +150,17 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, 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"); - } + 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; @@ -163,25 +168,27 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, 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. */ +/* 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_ABORT(); png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); #else if (setjmp(png_ptr->jmpbuf)) - PNG_ABORT(); -#endif + PNG_ABORT(); #endif +#endif /* PNG_SETJMP_SUPPORTED */ + 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 disappear as of libpng-1.3.0. */ + * This interface is deprecated in favour of the png_create_read_struct(), + * and it will disappear as of libpng-1.3.0. + */ #undef png_read_init void PNGAPI png_read_init(png_structp png_ptr) @@ -217,23 +224,23 @@ png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver, } #endif 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."); - } + png_error(png_ptr, + "The png struct allocated by the application for reading is too small."); + } 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_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 */ @@ -255,17 +262,17 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, 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; + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; #else - png_ptr->warning_fn = NULL; - png_warning(png_ptr, - "Application uses deprecated png_read_init() and should be recompiled."); - break; + 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"); @@ -298,6 +305,7 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, /* Initialize zbuf - compression buffer */ png_ptr->zbuf_size = PNG_ZBUF_SIZE; + png_ptr->zstream.zalloc = png_zalloc; png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, (png_uint_32)png_ptr->zbuf_size); png_ptr->zstream.zalloc = png_zalloc; @@ -306,11 +314,10 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, 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"); + case Z_OK: /* Do nothing */ break; + 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; @@ -319,7 +326,7 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); } -#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED +#ifndef PNG_NO_SEQUENTIAL_READ /* 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 @@ -331,9 +338,11 @@ 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"); + 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) { @@ -357,63 +366,61 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) for (;;) { -#ifdef PNG_USE_LOCAL_ARRAYS - PNG_CONST PNG_IHDR; - PNG_CONST PNG_IDAT; - PNG_CONST PNG_IEND; - PNG_CONST PNG_PLTE; -#if defined(PNG_READ_bKGD_SUPPORTED) - PNG_CONST PNG_bKGD; + PNG_IHDR; + PNG_IDAT; + PNG_IEND; + PNG_PLTE; +#ifdef PNG_READ_bKGD_SUPPORTED + PNG_bKGD; #endif -#if defined(PNG_READ_cHRM_SUPPORTED) - PNG_CONST PNG_cHRM; +#ifdef PNG_READ_cHRM_SUPPORTED + PNG_cHRM; #endif -#if defined(PNG_READ_gAMA_SUPPORTED) - PNG_CONST PNG_gAMA; +#ifdef PNG_READ_gAMA_SUPPORTED + PNG_gAMA; #endif -#if defined(PNG_READ_hIST_SUPPORTED) - PNG_CONST PNG_hIST; +#ifdef PNG_READ_hIST_SUPPORTED + PNG_hIST; #endif -#if defined(PNG_READ_iCCP_SUPPORTED) - PNG_CONST PNG_iCCP; +#ifdef PNG_READ_iCCP_SUPPORTED + PNG_iCCP; #endif -#if defined(PNG_READ_iTXt_SUPPORTED) - PNG_CONST PNG_iTXt; +#ifdef PNG_READ_iTXt_SUPPORTED + PNG_iTXt; #endif -#if defined(PNG_READ_oFFs_SUPPORTED) - PNG_CONST PNG_oFFs; +#ifdef PNG_READ_oFFs_SUPPORTED + PNG_oFFs; #endif -#if defined(PNG_READ_pCAL_SUPPORTED) - PNG_CONST PNG_pCAL; +#ifdef PNG_READ_pCAL_SUPPORTED + PNG_pCAL; #endif -#if defined(PNG_READ_pHYs_SUPPORTED) - PNG_CONST PNG_pHYs; +#ifdef PNG_READ_pHYs_SUPPORTED + PNG_pHYs; #endif -#if defined(PNG_READ_sBIT_SUPPORTED) - PNG_CONST PNG_sBIT; +#ifdef PNG_READ_sBIT_SUPPORTED + PNG_sBIT; #endif -#if defined(PNG_READ_sCAL_SUPPORTED) - PNG_CONST PNG_sCAL; +#ifdef PNG_READ_sCAL_SUPPORTED + PNG_sCAL; #endif -#if defined(PNG_READ_sPLT_SUPPORTED) - PNG_CONST PNG_sPLT; +#ifdef PNG_READ_sPLT_SUPPORTED + PNG_sPLT; #endif -#if defined(PNG_READ_sRGB_SUPPORTED) - PNG_CONST PNG_sRGB; +#ifdef PNG_READ_sRGB_SUPPORTED + PNG_sRGB; #endif -#if defined(PNG_READ_tEXt_SUPPORTED) - PNG_CONST PNG_tEXt; +#ifdef PNG_READ_tEXt_SUPPORTED + PNG_tEXt; #endif -#if defined(PNG_READ_tIME_SUPPORTED) - PNG_CONST PNG_tIME; +#ifdef PNG_READ_tIME_SUPPORTED + PNG_tIME; #endif -#if defined(PNG_READ_tRNS_SUPPORTED) - PNG_CONST PNG_tRNS; +#ifdef PNG_READ_tRNS_SUPPORTED + PNG_tRNS; #endif -#if defined(PNG_READ_zTXt_SUPPORTED) - PNG_CONST PNG_zTXt; +#ifdef PNG_READ_zTXt_SUPPORTED + PNG_zTXt; #endif -#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; @@ -461,71 +468,71 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) png_ptr->mode |= PNG_HAVE_IDAT; break; } -#if defined(PNG_READ_bKGD_SUPPORTED) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#ifdef PNG_READ_iTXt_SUPPORTED else if (!png_memcmp(chunk_name, png_iTXt, 4)) png_handle_iTXt(png_ptr, info_ptr, length); #endif @@ -533,13 +540,14 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) png_handle_unknown(png_ptr, info_ptr, length); } } -#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ /* 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"); + if (png_ptr == NULL) return; if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) @@ -550,7 +558,7 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr) png_read_transform_info(png_ptr, info_ptr); } -#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED +#ifndef PNG_NO_SEQUENTIAL_READ /* 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. @@ -560,28 +568,30 @@ void PNGAPI png_start_read_image(png_structp png_ptr) { 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_NO_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ -#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED +#ifndef PNG_NO_SEQUENTIAL_READ void PNGAPI png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) { -#ifdef PNG_USE_LOCAL_ARRAYS - PNG_CONST PNG_IDAT; + 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; + 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); if (png_ptr->row_number == 0 && png_ptr->pass == 0) @@ -617,7 +627,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) #endif } -#if defined(PNG_READ_INTERLACING_SUPPORTED) +#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)) { @@ -751,7 +761,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); -#if defined(PNG_MNG_FEATURES_SUPPORTED) +#ifdef PNG_MNG_FEATURES_SUPPORTED if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) { @@ -764,7 +774,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) png_do_read_transformations(png_ptr); -#if defined(PNG_READ_INTERLACING_SUPPORTED) +#ifdef PNG_READ_INTERLACING_SUPPORTED /* Blow up interlaced rows to full size */ if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) @@ -796,9 +806,9 @@ 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_NO_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ -#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED +#ifndef PNG_NO_SEQUENTIAL_READ /* 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 @@ -832,6 +842,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row, png_bytepp dp; png_debug(1, "in png_read_rows"); + if (png_ptr == NULL) return; rp = row; @@ -859,9 +870,9 @@ png_read_rows(png_structp png_ptr, png_bytepp row, dp++; } } -#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ -#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED +#ifndef PNG_NO_SEQUENTIAL_READ /* 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. @@ -882,6 +893,7 @@ png_read_image(png_structp png_ptr, png_bytepp image) png_bytepp rp; png_debug(1, "in png_read_image"); + if (png_ptr == NULL) return; @@ -908,9 +920,9 @@ png_read_image(png_structp png_ptr, png_bytepp image) } } } -#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ -#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED +#ifndef PNG_NO_SEQUENTIAL_READ /* 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. @@ -919,69 +931,68 @@ void PNGAPI png_read_end(png_structp png_ptr, png_infop info_ptr) { 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_CONST PNG_IHDR; - PNG_CONST PNG_IDAT; - PNG_CONST PNG_IEND; - PNG_CONST PNG_PLTE; -#if defined(PNG_READ_bKGD_SUPPORTED) - PNG_CONST PNG_bKGD; + PNG_IHDR; + PNG_IDAT; + PNG_IEND; + PNG_PLTE; +#ifdef PNG_READ_bKGD_SUPPORTED + PNG_bKGD; #endif -#if defined(PNG_READ_cHRM_SUPPORTED) - PNG_CONST PNG_cHRM; +#ifdef PNG_READ_cHRM_SUPPORTED + PNG_cHRM; #endif -#if defined(PNG_READ_gAMA_SUPPORTED) - PNG_CONST PNG_gAMA; +#ifdef PNG_READ_gAMA_SUPPORTED + PNG_gAMA; #endif -#if defined(PNG_READ_hIST_SUPPORTED) - PNG_CONST PNG_hIST; +#ifdef PNG_READ_hIST_SUPPORTED + PNG_hIST; #endif -#if defined(PNG_READ_iCCP_SUPPORTED) - PNG_CONST PNG_iCCP; +#ifdef PNG_READ_iCCP_SUPPORTED + PNG_iCCP; #endif -#if defined(PNG_READ_iTXt_SUPPORTED) - PNG_CONST PNG_iTXt; +#ifdef PNG_READ_iTXt_SUPPORTED + PNG_iTXt; #endif -#if defined(PNG_READ_oFFs_SUPPORTED) - PNG_CONST PNG_oFFs; +#ifdef PNG_READ_oFFs_SUPPORTED + PNG_oFFs; #endif -#if defined(PNG_READ_pCAL_SUPPORTED) - PNG_CONST PNG_pCAL; +#ifdef PNG_READ_pCAL_SUPPORTED + PNG_pCAL; #endif -#if defined(PNG_READ_pHYs_SUPPORTED) - PNG_CONST PNG_pHYs; +#ifdef PNG_READ_pHYs_SUPPORTED + PNG_pHYs; #endif -#if defined(PNG_READ_sBIT_SUPPORTED) - PNG_CONST PNG_sBIT; +#ifdef PNG_READ_sBIT_SUPPORTED + PNG_sBIT; #endif -#if defined(PNG_READ_sCAL_SUPPORTED) - PNG_CONST PNG_sCAL; +#ifdef PNG_READ_sCAL_SUPPORTED + PNG_sCAL; #endif -#if defined(PNG_READ_sPLT_SUPPORTED) - PNG_CONST PNG_sPLT; +#ifdef PNG_READ_sPLT_SUPPORTED + PNG_sPLT; #endif -#if defined(PNG_READ_sRGB_SUPPORTED) - PNG_CONST PNG_sRGB; +#ifdef PNG_READ_sRGB_SUPPORTED + PNG_sRGB; #endif -#if defined(PNG_READ_tEXt_SUPPORTED) - PNG_CONST PNG_tEXt; +#ifdef PNG_READ_tEXt_SUPPORTED + PNG_tEXt; #endif -#if defined(PNG_READ_tIME_SUPPORTED) - PNG_CONST PNG_tIME; +#ifdef PNG_READ_tIME_SUPPORTED + PNG_tIME; #endif -#if defined(PNG_READ_tRNS_SUPPORTED) - PNG_CONST PNG_tRNS; +#ifdef PNG_READ_tRNS_SUPPORTED + PNG_tRNS; #endif -#if defined(PNG_READ_zTXt_SUPPORTED) - PNG_CONST PNG_zTXt; +#ifdef PNG_READ_zTXt_SUPPORTED + PNG_zTXt; #endif -#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; @@ -1013,71 +1024,71 @@ png_read_end(png_structp png_ptr, png_infop info_ptr) } else if (!png_memcmp(chunk_name, png_PLTE, 4)) png_handle_PLTE(png_ptr, info_ptr, length); -#if defined(PNG_READ_bKGD_SUPPORTED) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#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) +#ifdef PNG_READ_iTXt_SUPPORTED else if (!png_memcmp(chunk_name, png_iTXt, 4)) png_handle_iTXt(png_ptr, info_ptr, length); #endif @@ -1085,7 +1096,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr) png_handle_unknown(png_ptr, info_ptr, length); } while (!(png_ptr->mode & PNG_HAVE_IEND)); } -#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ /* Free all memory used by the read */ void PNGAPI @@ -1100,6 +1111,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, #endif png_debug(1, "in png_destroy_read_struct"); + if (png_ptr_ptr != NULL) png_ptr = *png_ptr_ptr; if (png_ptr == NULL) @@ -1120,7 +1132,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_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 @@ -1135,7 +1147,7 @@ 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 @@ -1174,6 +1186,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr #endif png_debug(1, "in png_read_destroy"); + if (info_ptr != NULL) png_info_destroy(png_ptr, info_ptr); @@ -1184,14 +1197,14 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr 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) +#ifdef PNG_READ_DITHER_SUPPORTED png_free(png_ptr, png_ptr->palette_lookup); png_free(png_ptr, png_ptr->dither_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 @@ -1216,7 +1229,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; #endif #endif -#if defined(PNG_READ_hIST_SUPPORTED) +#ifdef PNG_READ_hIST_SUPPORTED #ifdef PNG_FREE_ME_SUPPORTED if (png_ptr->free_me & PNG_FREE_HIST) png_free(png_ptr, png_ptr->hist); @@ -1227,7 +1240,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr 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; @@ -1238,7 +1251,7 @@ 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; @@ -1261,7 +1274,7 @@ 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 @@ -1314,8 +1327,8 @@ png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) } -#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED -#if defined(PNG_INFO_IMAGE_SUPPORTED) +#ifndef PNG_NO_SEQUENTIAL_READ +#ifdef PNG_INFO_IMAGE_SUPPORTED void PNGAPI png_read_png(png_structp png_ptr, png_infop info_ptr, int transforms, @@ -1325,7 +1338,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, if (png_ptr == NULL) return; -#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED /* Invert the alpha channel from opacity to transparency */ if (transforms & PNG_TRANSFORM_INVERT_ALPHA) @@ -1341,14 +1354,14 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, /* -------------- image transformations start here ------------------- */ -#if defined(PNG_READ_16_TO_8_SUPPORTED) +#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); #endif -#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED /* Strip alpha bytes from the input data without combining with * the background (not recommended). */ @@ -1364,7 +1377,7 @@ png_read_png(png_structp png_ptr, png_infop info_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). */ @@ -1372,7 +1385,7 @@ png_read_png(png_structp png_ptr, png_infop info_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 @@ -1388,14 +1401,14 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, /* We don't handle background color or gamma transformation or dithering. */ -#if defined(PNG_READ_INVERT_SUPPORTED) +#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); #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: @@ -1410,21 +1423,21 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, } #endif -#if defined(PNG_READ_BGR_SUPPORTED) +#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); #endif -#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) +#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) +#ifdef PNG_READ_SWAP_SUPPORTED /* Swap bytes of 16 bit files to least significant byte first */ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) @@ -1450,9 +1463,11 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, info_ptr->height * png_sizeof(png_bytep)); png_memset(info_ptr->row_pointers, 0, info_ptr->height * png_sizeof(png_bytep)); + #ifdef PNG_FREE_ME_SUPPORTED 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)); @@ -1469,5 +1484,5 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, } #endif /* PNG_INFO_IMAGE_SUPPORTED */ -#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ #endif /* PNG_READ_SUPPORTED */