X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/1f0299c17dc878540bf190c290392db241b425ad..3013861102292eb82391e361bee1dc090783c653:/src/png/pngread.c diff --git a/src/png/pngread.c b/src/png/pngread.c index 714f5f1429..92060d2bc6 100644 --- a/src/png/pngread.c +++ b/src/png/pngread.c @@ -1,146 +1,233 @@ /* pngread.c - read a PNG file * - * libpng 1.0.1 - * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. - * Copyright (c) 1996, 1997 Andreas Dilger - * Copyright (c) 1998, Glenn Randers-Pehrson - * March 15, 1998 + * 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 -#include "../png/png.h" +#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 -png_create_read_struct(png_const_charp user_png_ver, voidp error_ptr, +png_structp PNGAPI +png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn) { + +#ifdef PNG_USER_MEM_SUPPORTED + return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, + warn_fn, NULL, NULL, NULL)); +} + +/* 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, + png_malloc_ptr malloc_fn, png_free_ptr free_fn) +{ +#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 jmp_buf jmpbuf; #endif - png_debug(1, "in png_create_read_struct\n"); - if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL) - { - return (png_structp)NULL; - } +#endif + + 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, + malloc_fn, mem_ptr); +#else + png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); +#endif + if (png_ptr == NULL) + return (NULL); + + /* 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 + +#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)) + if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */ #endif - { - png_free(png_ptr, png_ptr->zbuf); - png_destroy_struct(png_ptr); - return (png_structp)NULL; - } + PNG_ABORT(); #ifdef USE_FAR_KEYWORD - png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); + 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); #endif + png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - /* 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] == '0' && user_png_ver[2] < '9')) + if (user_png_ver) { - png_error(png_ptr, - "Incompatible libpng version in application and library"); + 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; +#endif + 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)) + if (!png_cleanup_needed) { - 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_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; + } } - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - - png_set_read_fn(png_ptr, NULL, NULL); - - return (png_ptr); -} - -/* Initialize PNG structure for reading, and allocate any memory needed. - This interface is depreciated in favour of the png_create_read_struct(), - and it will eventually disappear. */ -void -png_read_init(png_structp png_ptr) -{ - jmp_buf tmp_jmp; /* to save current jump buffer */ - - png_debug(1, "in png_read_init\n"); - /* save jump buffer and error functions */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); - - /* reset all variables to 0 */ - png_memset(png_ptr, 0, sizeof (png_struct)); - - /* restore jump buffer */ - png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); - - /* 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)) + if (png_cleanup_needed) { - 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"); + /* 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_destroy_struct((png_voidp)png_ptr); +#endif + 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, 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 - * been read from the beginning of the stream (up to the maxumum of 8) + * been read from the beginning of the stream (up to the maximum of 8) * via png_set_sig_bytes(), and we will only check the remaining bytes * here. The application can then have access to the signature bytes we * read if it is determined that this isn't a valid PNG file. */ -void +void PNGAPI png_read_info(png_structp png_ptr, png_infop info_ptr) { - png_debug(1, "in png_read_info\n"); - /* save jump buffer and error functions */ + 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; @@ -152,31 +239,103 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) else png_error(png_ptr, "PNG file corrupted by ASCII conversion"); } + if (num_checked < 3) + png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; } - for(;;) + for (;;) { - 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_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name); + PNG_IHDR; + PNG_IDAT; + PNG_IEND; + PNG_PLTE; +#ifdef PNG_READ_bKGD_SUPPORTED + PNG_bKGD; +#endif +#ifdef PNG_READ_cHRM_SUPPORTED + PNG_cHRM; +#endif +#ifdef PNG_READ_gAMA_SUPPORTED + PNG_gAMA; +#endif +#ifdef PNG_READ_hIST_SUPPORTED + PNG_hIST; +#endif +#ifdef PNG_READ_iCCP_SUPPORTED + PNG_iCCP; +#endif +#ifdef PNG_READ_iTXt_SUPPORTED + PNG_iTXt; +#endif +#ifdef PNG_READ_oFFs_SUPPORTED + PNG_oFFs; +#endif +#ifdef PNG_READ_pCAL_SUPPORTED + PNG_pCAL; +#endif +#ifdef PNG_READ_pHYs_SUPPORTED + PNG_pHYs; +#endif +#ifdef PNG_READ_sBIT_SUPPORTED + PNG_sBIT; +#endif +#ifdef PNG_READ_sCAL_SUPPORTED + PNG_sCAL; +#endif +#ifdef PNG_READ_sPLT_SUPPORTED + PNG_sPLT; +#endif +#ifdef PNG_READ_sRGB_SUPPORTED + PNG_sRGB; +#endif +#ifdef PNG_READ_tEXt_SUPPORTED + PNG_tEXt; +#endif +#ifdef PNG_READ_tIME_SUPPORTED + PNG_tIME; +#endif +#ifdef PNG_READ_tRNS_SUPPORTED + PNG_tRNS; +#endif +#ifdef PNG_READ_zTXt_SUPPORTED + PNG_zTXt; +#endif + 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_PLTE, 4)) - png_handle_PLTE(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); - else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + else if (png_handle_as_unknown(png_ptr, chunk_name)) + { + 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(chunk_name, png_PLTE, 4)) + png_ptr->mode |= PNG_HAVE_PLTE; + else if (!png_memcmp(chunk_name, png_IDAT, 4)) + { + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before IDAT"); + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_error(png_ptr, "Missing PLTE before IDAT"); + break; + } + } +#endif + else if (!png_memcmp(chunk_name, png_PLTE, 4)) + png_handle_PLTE(png_ptr, info_ptr, length); + else if (!png_memcmp(chunk_name, png_IDAT, 4)) { if (!(png_ptr->mode & PNG_HAVE_IHDR)) png_error(png_ptr, "Missing IHDR before IDAT"); @@ -188,106 +347,175 @@ 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_pHYs_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) +#ifdef PNG_READ_sCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_sCAL, 4)) + png_handle_sCAL(png_ptr, info_ptr, length); +#endif +#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_tEXt_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) +#ifdef PNG_READ_iCCP_SUPPORTED + else if (!png_memcmp(chunk_name, png_iCCP, 4)) + png_handle_iCCP(png_ptr, info_ptr, length); +#endif +#ifdef PNG_READ_sPLT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sPLT, 4)) + png_handle_sPLT(png_ptr, info_ptr, length); +#endif +#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 +#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 */ -void +/* 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"); - /* save jump buffer and error functions */ + 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 obtail a gamma corrected palette, for example. + * the user to obtain a gamma-corrected palette, for example. * If the user doesn't call this, we will do it ourselves. */ -void +void PNGAPI png_start_read_image(png_structp png_ptr) { - png_debug(1, "in png_start_read_image\n"); - /* save jump buffer and error functions */ + 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 */ -void +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +void PNGAPI png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) { + 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}; int ret; - png_debug2(1, "in png_read_row (row %d, pass %d)\n", - png_ptr->row_number, png_ptr->pass); - /* save jump buffer and error functions */ + + 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 */ +#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"); +#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"); +#endif +#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"); +#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"); +#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"); +#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"); +#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"); +#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) { case 0: - if (png_ptr->row_number & 7) + if (png_ptr->row_number & 0x07) { if (dsp_row != NULL) png_combine_row(png_ptr, dsp_row, @@ -297,7 +525,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) } break; case 1: - if ((png_ptr->row_number & 7) || png_ptr->width < 5) + if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) { if (dsp_row != NULL) png_combine_row(png_ptr, dsp_row, @@ -307,7 +535,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) } break; case 2: - if ((png_ptr->row_number & 7) != 4) + if ((png_ptr->row_number & 0x07) != 4) { if (dsp_row != NULL && (png_ptr->row_number & 4)) png_combine_row(png_ptr, dsp_row, @@ -361,22 +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); - - 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"); } @@ -393,7 +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; @@ -409,29 +633,40 @@ 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]) 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); + png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); - if (png_ptr->transformations) +#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 */ + png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); + } +#endif + + + 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) - 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) png_combine_row(png_ptr, dsp_row, @@ -453,14 +688,16 @@ 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 - * image has alpha or transparency, and png_handle_alpha() has been + * image has alpha or transparency, and png_handle_alpha()[*] has been * called, the rows contents must be initialized to the contents of the * screen. - * + * * "row" holds the actual image, and pixels are placed in it * as they arrive. If the image is displayed after each pass, it will * appear to "sparkle" in. "display_row" can be used to display a @@ -474,9 +711,11 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) * also, but you may. If the image is not interlaced, or if you have * 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 this version of libpng */ -void +void PNGAPI png_read_rows(png_structp png_ptr, png_bytepp row, png_bytepp display_row, png_uint_32 num_rows) { @@ -484,33 +723,40 @@ png_read_rows(png_structp png_ptr, png_bytepp row, png_bytepp rp; png_bytepp dp; - png_debug(1, "in png_read_rows\n"); - /* save jump buffer and error functions */ + png_debug(1, "in png_read_rows"); + + if (png_ptr == NULL) + return; rp = row; dp = display_row; - for (i = 0; i < num_rows; i++) - { - png_bytep rptr; - png_bytep dptr; + if (rp != NULL && dp != NULL) + for (i = 0; i < num_rows; i++) + { + png_bytep rptr = *rp++; + png_bytep dptr = *dp++; - if (rp != NULL) - rptr = *rp; - else - rptr = NULL; - if (dp != NULL) - dptr = *dp; - else - dptr = NULL; - png_read_row(png_ptr, rptr, dptr); - if (row != NULL) + png_read_row(png_ptr, rptr, dptr); + } + else if (rp != NULL) + for (i = 0; i < num_rows; i++) + { + png_bytep rptr = *rp; + png_read_row(png_ptr, rptr, NULL); rp++; - if (display_row != NULL) + } + else if (dp != NULL) + for (i = 0; i < num_rows; i++) + { + png_bytep dptr = *dp; + 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 + * chunk, and you have called png_handle_alpha()[*], you will need to * initialize the image to the current image that PNG will be overlaying. * We set the num_rows again here, in case it was incorrectly set in * png_read_start_row() by a call to png_read_update_info() or @@ -518,140 +764,245 @@ png_read_rows(png_structp png_ptr, png_bytepp row, * prior to either of these functions like it should have been. You can * 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 this version of libpng */ -void +void PNGAPI png_read_image(png_structp png_ptr, png_bytepp image) { - png_uint_32 i; + png_uint_32 i, image_height; int pass, j; png_bytepp rp; - png_debug(1, "in png_read_image\n"); - /* save jump buffer and error functions */ + 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"); + pass = 1; +#endif + - png_ptr->num_rows = png_ptr->height; /* Make sure this is set correctly */ + image_height=png_ptr->height; + png_ptr->num_rows = image_height; /* Make sure this is set correctly */ for (j = 0; j < pass; j++) { rp = image; - for (i = 0; i < png_ptr->height; i++) + for (i = 0; i < image_height; i++) { 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. */ -void +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"); - /* save jump buffer and error functions */ + 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 { - 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_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name); + PNG_IHDR; + PNG_IDAT; + PNG_IEND; + PNG_PLTE; +#ifdef PNG_READ_bKGD_SUPPORTED + PNG_bKGD; +#endif +#ifdef PNG_READ_cHRM_SUPPORTED + PNG_cHRM; +#endif +#ifdef PNG_READ_gAMA_SUPPORTED + PNG_gAMA; +#endif +#ifdef PNG_READ_hIST_SUPPORTED + PNG_hIST; +#endif +#ifdef PNG_READ_iCCP_SUPPORTED + PNG_iCCP; +#endif +#ifdef PNG_READ_iTXt_SUPPORTED + PNG_iTXt; +#endif +#ifdef PNG_READ_oFFs_SUPPORTED + PNG_oFFs; +#endif +#ifdef PNG_READ_pCAL_SUPPORTED + PNG_pCAL; +#endif +#ifdef PNG_READ_pHYs_SUPPORTED + PNG_pHYs; +#endif +#ifdef PNG_READ_sBIT_SUPPORTED + PNG_sBIT; +#endif +#ifdef PNG_READ_sCAL_SUPPORTED + PNG_sCAL; +#endif +#ifdef PNG_READ_sPLT_SUPPORTED + PNG_sPLT; +#endif +#ifdef PNG_READ_sRGB_SUPPORTED + PNG_sRGB; +#endif +#ifdef PNG_READ_tEXt_SUPPORTED + PNG_tEXt; +#endif +#ifdef PNG_READ_tIME_SUPPORTED + PNG_tIME; +#endif +#ifdef PNG_READ_tRNS_SUPPORTED + PNG_tRNS; +#endif +#ifdef PNG_READ_zTXt_SUPPORTED + PNG_zTXt; +#endif + png_uint_32 length = png_read_chunk_header(png_ptr); + PNG_CONST png_bytep chunk_name = 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_IDAT, 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, chunk_name)) + { + if (!png_memcmp(chunk_name, png_IDAT, 4)) + { + if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) + png_benign_error(png_ptr, "Too many IDATs found"); + } + png_handle_unknown(png_ptr, info_ptr, length); + if (!png_memcmp(chunk_name, png_PLTE, 4)) + png_ptr->mode |= PNG_HAVE_PLTE; + } +#endif + 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"); - else - png_crc_finish(png_ptr, 0); + 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); - else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) - png_handle_IEND(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_pHYs_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) +#ifdef PNG_READ_sCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_sCAL, 4)) + png_handle_sCAL(png_ptr, info_ptr, length); +#endif +#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_tEXt_SUPPORTED) - else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) +#ifdef PNG_READ_iCCP_SUPPORTED + else if (!png_memcmp(chunk_name, png_iCCP, 4)) + png_handle_iCCP(png_ptr, info_ptr, length); +#endif +#ifdef PNG_READ_sPLT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sPLT, 4)) + png_handle_sPLT(png_ptr, info_ptr, length); +#endif +#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 +#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 */ -void +/* 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) { png_structp png_ptr = NULL; png_infop info_ptr = NULL, end_info_ptr = NULL; +#ifdef PNG_USER_MEM_SUPPORTED + png_free_ptr free_fn = NULL; + png_voidp mem_ptr = NULL; +#endif - png_debug(1, "in png_destroy_read_struct\n"); - /* save jump buffer and error functions */ + 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; @@ -663,40 +1014,62 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, if (info_ptr != NULL) { -#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) - png_free(png_ptr, info_ptr->text); +#ifdef PNG_TEXT_SUPPORTED + png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); #endif + +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); +#else png_destroy_struct((png_voidp)info_ptr); - *info_ptr_ptr = (png_infop)NULL; +#endif + *info_ptr_ptr = NULL; } if (end_info_ptr != NULL) { -#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) - png_free(png_ptr, end_info_ptr->text); +#ifdef PNG_READ_TEXT_SUPPORTED + png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); #endif +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); +#else png_destroy_struct((png_voidp)end_info_ptr); - *end_info_ptr_ptr = (png_infop)NULL; +#endif + *end_info_ptr_ptr = NULL; } if (png_ptr != 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); - *png_ptr_ptr = (png_structp)NULL; +#endif + *png_ptr_ptr = NULL; } } -/* free all memory used by the read (old method) */ -void -png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr) +/* 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) { +#ifdef PNG_SETJMP_SUPPORTED jmp_buf tmp_jmp; +#endif png_error_ptr error_fn; png_error_ptr warning_fn; png_voidp error_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + png_free_ptr free_fn; +#endif - png_debug(1, "in png_read_destroy\n"); - /* save jump buffer and error functions */ + png_debug(1, "in png_read_destroy"); + if (info_ptr != NULL) png_info_destroy(png_ptr, info_ptr); @@ -704,57 +1077,70 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr png_info_destroy(png_ptr, end_info_ptr); png_free(png_ptr, png_ptr->zbuf); - png_free(png_ptr, png_ptr->row_buf); + 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 - if (png_ptr->flags & PNG_FLAG_FREE_PALETTE) + if (png_ptr->free_me & PNG_FREE_PLTE) png_zfree(png_ptr, png_ptr->palette); - if (png_ptr->flags & PNG_FLAG_FREE_TRANS) - png_free(png_ptr, png_ptr->trans); -#if defined(PNG_READ_hIST_SUPPORTED) - if (png_ptr->flags & PNG_FLAG_FREE_HIST) + png_ptr->free_me &= ~PNG_FREE_PLTE; +#if defined(PNG_tRNS_SUPPORTED) || \ + defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + if (png_ptr->free_me & PNG_FREE_TRNS) + png_free(png_ptr, png_ptr->trans_alpha); + png_ptr->free_me &= ~PNG_FREE_TRNS; +#endif +#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; #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (png_ptr->gamma_16_table != NULL) { int i; - for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++) + int istop = (1 << (8 - png_ptr->gamma_shift)); + for (i = 0; i < istop; i++) { png_free(png_ptr, png_ptr->gamma_16_table[i]); } - } -#endif -#if defined(PNG_READ_BACKGROUND_SUPPORTED) png_free(png_ptr, png_ptr->gamma_16_table); + } +#ifdef PNG_READ_BACKGROUND_SUPPORTED if (png_ptr->gamma_16_from_1 != NULL) { int i; - for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++) + int istop = (1 << (8 - png_ptr->gamma_shift)); + for (i = 0; i < istop; i++) { png_free(png_ptr, png_ptr->gamma_16_from_1[i]); } - } png_free(png_ptr, png_ptr->gamma_16_from_1); + } if (png_ptr->gamma_16_to_1 != NULL) { int i; - for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++) + int istop = (1 << (8 - png_ptr->gamma_shift)); + for (i = 0; i < istop; i++) { png_free(png_ptr, png_ptr->gamma_16_to_1[i]); } - } png_free(png_ptr, png_ptr->gamma_16_to_1); + } +#endif +#endif +#ifdef PNG_TIME_RFC1123_SUPPORTED + png_free(png_ptr, png_ptr->time_buffer); #endif inflateEnd(&png_ptr->zstream); @@ -762,26 +1148,214 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr png_free(png_ptr, png_ptr->save_buffer); #endif +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED +#ifdef PNG_TEXT_SUPPORTED + png_free(png_ptr, png_ptr->current_text); +#endif /* PNG_TEXT_SUPPORTED */ +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ + /* Save the important info out of the png_struct, in case it is * being used again. */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); +#ifdef PNG_SETJMP_SUPPORTED + png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); +#endif error_fn = png_ptr->error_fn; warning_fn = png_ptr->warning_fn; error_ptr = png_ptr->error_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + 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; png_ptr->error_ptr = error_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + png_ptr->free_fn = free_fn; +#endif + +#ifdef PNG_SETJMP_SUPPORTED + png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); +#endif - png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); } -void +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; } + + +#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, + voidp params) +{ + int row; + + if (png_ptr == NULL) + return; + + /* 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 ------------------- */ + +#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 + +#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); +#endif + +#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) + /* 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); +#endif + +#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). + */ + if (transforms & PNG_TRANSFORM_PACKSWAP) + png_set_packswap(png_ptr); +#endif + +#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))) + png_set_expand(png_ptr); +#endif + + /* We don't handle background color or gamma transformation or quantizing. + */ + +#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 + +#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: + */ + if ((transforms & PNG_TRANSFORM_SHIFT) + && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT)) + { + png_color_8p sig_bit; + + png_get_sBIT(png_ptr, info_ptr, &sig_bit); + png_set_shift(png_ptr, sig_bit); + } +#endif + +#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 + +#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 + +#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); +#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 */ + + /* Optional call to gamma correct and add the background to the palette + * and update info structure. REQUIRED if you are expecting libpng to + * update the palette for you (i.e., you selected such a transform above). + */ + png_read_update_info(png_ptr, info_ptr); + + /* -------------- image transformations end here ------------------- */ + + png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); + if (info_ptr->row_pointers == NULL) + { + png_uint_32 iptr; + + info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, + 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; + + 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 */ + png_read_end(png_ptr, info_ptr); + + transforms = transforms; /* Quiet compiler warnings */ + params = params; + +} +#endif /* PNG_INFO_IMAGE_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED */