nuclear@26: nuclear@26: /* pngread.c - read a PNG file nuclear@26: * nuclear@26: * Last changed in libpng 1.2.30 [August 15, 2008] nuclear@26: * For conditions of distribution and use, see copyright notice in png.h nuclear@26: * Copyright (c) 1998-2008 Glenn Randers-Pehrson nuclear@26: * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) nuclear@26: * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) nuclear@26: * nuclear@26: * This file contains routines that an application calls directly to nuclear@26: * read a PNG file or stream. nuclear@26: */ nuclear@26: nuclear@26: #define PNG_INTERNAL nuclear@26: #include "png.h" nuclear@26: #if defined(PNG_READ_SUPPORTED) nuclear@26: nuclear@26: /* Create a PNG structure for reading, and allocate any memory needed. */ nuclear@26: png_structp PNGAPI nuclear@26: png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, nuclear@26: png_error_ptr error_fn, png_error_ptr warn_fn) nuclear@26: { nuclear@26: nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, nuclear@26: warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL)); nuclear@26: } nuclear@26: nuclear@26: /* Alternate create PNG structure for reading, and allocate any memory needed. */ nuclear@26: png_structp PNGAPI nuclear@26: png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, nuclear@26: png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, nuclear@26: png_malloc_ptr malloc_fn, png_free_ptr free_fn) nuclear@26: { nuclear@26: #endif /* PNG_USER_MEM_SUPPORTED */ nuclear@26: nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: volatile nuclear@26: #endif nuclear@26: png_structp png_ptr; nuclear@26: nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: #ifdef USE_FAR_KEYWORD nuclear@26: jmp_buf jmpbuf; nuclear@26: #endif nuclear@26: #endif nuclear@26: nuclear@26: int i; nuclear@26: nuclear@26: png_debug(1, "in png_create_read_struct\n"); nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, nuclear@26: (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); nuclear@26: #else nuclear@26: png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); nuclear@26: #endif nuclear@26: if (png_ptr == NULL) nuclear@26: return (NULL); nuclear@26: nuclear@26: /* added at libpng-1.2.6 */ nuclear@26: #ifdef PNG_SET_USER_LIMITS_SUPPORTED nuclear@26: png_ptr->user_width_max=PNG_USER_WIDTH_MAX; nuclear@26: png_ptr->user_height_max=PNG_USER_HEIGHT_MAX; nuclear@26: #endif nuclear@26: nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: #ifdef USE_FAR_KEYWORD nuclear@26: if (setjmp(jmpbuf)) nuclear@26: #else nuclear@26: if (setjmp(png_ptr->jmpbuf)) nuclear@26: #endif nuclear@26: { nuclear@26: png_free(png_ptr, png_ptr->zbuf); nuclear@26: png_ptr->zbuf = NULL; nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_destroy_struct_2((png_voidp)png_ptr, nuclear@26: (png_free_ptr)free_fn, (png_voidp)mem_ptr); nuclear@26: #else nuclear@26: png_destroy_struct((png_voidp)png_ptr); nuclear@26: #endif nuclear@26: return (NULL); nuclear@26: } nuclear@26: #ifdef USE_FAR_KEYWORD nuclear@26: png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); nuclear@26: #endif nuclear@26: #endif nuclear@26: nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); nuclear@26: #endif nuclear@26: nuclear@26: png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); nuclear@26: nuclear@26: if (user_png_ver) nuclear@26: { nuclear@26: i = 0; nuclear@26: do nuclear@26: { nuclear@26: if (user_png_ver[i] != png_libpng_ver[i]) nuclear@26: png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; nuclear@26: } while (png_libpng_ver[i++]); nuclear@26: } nuclear@26: else nuclear@26: png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; nuclear@26: nuclear@26: nuclear@26: if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) nuclear@26: { nuclear@26: /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so nuclear@26: * we must recompile any applications that use any older library version. nuclear@26: * For versions after libpng 1.0, we will be compatible, so we need nuclear@26: * only check the first digit. nuclear@26: */ nuclear@26: if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || nuclear@26: (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || nuclear@26: (user_png_ver[0] == '0' && user_png_ver[2] < '9')) nuclear@26: { nuclear@26: #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) nuclear@26: char msg[80]; nuclear@26: if (user_png_ver) nuclear@26: { nuclear@26: png_snprintf(msg, 80, nuclear@26: "Application was compiled with png.h from libpng-%.20s", nuclear@26: user_png_ver); nuclear@26: png_warning(png_ptr, msg); nuclear@26: } nuclear@26: png_snprintf(msg, 80, nuclear@26: "Application is running with png.c from libpng-%.20s", nuclear@26: png_libpng_ver); nuclear@26: png_warning(png_ptr, msg); nuclear@26: #endif nuclear@26: #ifdef PNG_ERROR_NUMBERS_SUPPORTED nuclear@26: png_ptr->flags = 0; nuclear@26: #endif nuclear@26: png_error(png_ptr, nuclear@26: "Incompatible libpng version in application and library"); nuclear@26: } nuclear@26: } nuclear@26: nuclear@26: /* initialize zbuf - compression buffer */ nuclear@26: png_ptr->zbuf_size = PNG_ZBUF_SIZE; nuclear@26: png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, nuclear@26: (png_uint_32)png_ptr->zbuf_size); nuclear@26: png_ptr->zstream.zalloc = png_zalloc; nuclear@26: png_ptr->zstream.zfree = png_zfree; nuclear@26: png_ptr->zstream.opaque = (voidpf)png_ptr; nuclear@26: nuclear@26: switch (inflateInit(&png_ptr->zstream)) nuclear@26: { nuclear@26: case Z_OK: /* Do nothing */ break; nuclear@26: case Z_MEM_ERROR: nuclear@26: case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break; nuclear@26: case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break; nuclear@26: default: png_error(png_ptr, "Unknown zlib error"); nuclear@26: } nuclear@26: nuclear@26: png_ptr->zstream.next_out = png_ptr->zbuf; nuclear@26: png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; nuclear@26: nuclear@26: png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); nuclear@26: nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: /* Applications that neglect to set up their own setjmp() and then encounter nuclear@26: a png_error() will longjmp here. Since the jmpbuf is then meaningless we nuclear@26: abort instead of returning. */ nuclear@26: #ifdef USE_FAR_KEYWORD nuclear@26: if (setjmp(jmpbuf)) nuclear@26: PNG_ABORT(); nuclear@26: png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); nuclear@26: #else nuclear@26: if (setjmp(png_ptr->jmpbuf)) nuclear@26: PNG_ABORT(); nuclear@26: #endif nuclear@26: #endif nuclear@26: return (png_ptr); nuclear@26: } nuclear@26: nuclear@26: #if defined(PNG_1_0_X) || defined(PNG_1_2_X) nuclear@26: /* Initialize PNG structure for reading, and allocate any memory needed. nuclear@26: This interface is deprecated in favour of the png_create_read_struct(), nuclear@26: and it will disappear as of libpng-1.3.0. */ nuclear@26: #undef png_read_init nuclear@26: void PNGAPI nuclear@26: png_read_init(png_structp png_ptr) nuclear@26: { nuclear@26: /* We only come here via pre-1.0.7-compiled applications */ nuclear@26: png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0); nuclear@26: } nuclear@26: nuclear@26: void PNGAPI nuclear@26: png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver, nuclear@26: png_size_t png_struct_size, png_size_t png_info_size) nuclear@26: { nuclear@26: /* We only come here via pre-1.0.12-compiled applications */ nuclear@26: if (png_ptr == NULL) return; nuclear@26: #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) nuclear@26: if (png_sizeof(png_struct) > png_struct_size || nuclear@26: png_sizeof(png_info) > png_info_size) nuclear@26: { nuclear@26: char msg[80]; nuclear@26: png_ptr->warning_fn = NULL; nuclear@26: if (user_png_ver) nuclear@26: { nuclear@26: png_snprintf(msg, 80, nuclear@26: "Application was compiled with png.h from libpng-%.20s", nuclear@26: user_png_ver); nuclear@26: png_warning(png_ptr, msg); nuclear@26: } nuclear@26: png_snprintf(msg, 80, nuclear@26: "Application is running with png.c from libpng-%.20s", nuclear@26: png_libpng_ver); nuclear@26: png_warning(png_ptr, msg); nuclear@26: } nuclear@26: #endif nuclear@26: if (png_sizeof(png_struct) > png_struct_size) nuclear@26: { nuclear@26: png_ptr->error_fn = NULL; nuclear@26: #ifdef PNG_ERROR_NUMBERS_SUPPORTED nuclear@26: png_ptr->flags = 0; nuclear@26: #endif nuclear@26: png_error(png_ptr, nuclear@26: "The png struct allocated by the application for reading is too small."); nuclear@26: } nuclear@26: if (png_sizeof(png_info) > png_info_size) nuclear@26: { nuclear@26: png_ptr->error_fn = NULL; nuclear@26: #ifdef PNG_ERROR_NUMBERS_SUPPORTED nuclear@26: png_ptr->flags = 0; nuclear@26: #endif nuclear@26: png_error(png_ptr, nuclear@26: "The info struct allocated by application for reading is too small."); nuclear@26: } nuclear@26: png_read_init_3(&png_ptr, user_png_ver, png_struct_size); nuclear@26: } nuclear@26: #endif /* PNG_1_0_X || PNG_1_2_X */ nuclear@26: nuclear@26: void PNGAPI nuclear@26: png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, nuclear@26: png_size_t png_struct_size) nuclear@26: { nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: jmp_buf tmp_jmp; /* to save current jump buffer */ nuclear@26: #endif nuclear@26: nuclear@26: int i = 0; nuclear@26: nuclear@26: png_structp png_ptr=*ptr_ptr; nuclear@26: nuclear@26: if (png_ptr == NULL) return; nuclear@26: nuclear@26: do nuclear@26: { nuclear@26: if (user_png_ver[i] != png_libpng_ver[i]) nuclear@26: { nuclear@26: #ifdef PNG_LEGACY_SUPPORTED nuclear@26: png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; nuclear@26: #else nuclear@26: png_ptr->warning_fn = NULL; nuclear@26: png_warning(png_ptr, nuclear@26: "Application uses deprecated png_read_init() and should be recompiled."); nuclear@26: break; nuclear@26: #endif nuclear@26: } nuclear@26: } while (png_libpng_ver[i++]); nuclear@26: nuclear@26: png_debug(1, "in png_read_init_3\n"); nuclear@26: nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: /* save jump buffer and error functions */ nuclear@26: png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); nuclear@26: #endif nuclear@26: nuclear@26: if (png_sizeof(png_struct) > png_struct_size) nuclear@26: { nuclear@26: png_destroy_struct(png_ptr); nuclear@26: *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); nuclear@26: png_ptr = *ptr_ptr; nuclear@26: } nuclear@26: nuclear@26: /* reset all variables to 0 */ nuclear@26: png_memset(png_ptr, 0, png_sizeof(png_struct)); nuclear@26: nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: /* restore jump buffer */ nuclear@26: png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); nuclear@26: #endif nuclear@26: nuclear@26: /* added at libpng-1.2.6 */ nuclear@26: #ifdef PNG_SET_USER_LIMITS_SUPPORTED nuclear@26: png_ptr->user_width_max=PNG_USER_WIDTH_MAX; nuclear@26: png_ptr->user_height_max=PNG_USER_HEIGHT_MAX; nuclear@26: #endif nuclear@26: nuclear@26: /* initialize zbuf - compression buffer */ nuclear@26: png_ptr->zbuf_size = PNG_ZBUF_SIZE; nuclear@26: png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, nuclear@26: (png_uint_32)png_ptr->zbuf_size); nuclear@26: png_ptr->zstream.zalloc = png_zalloc; nuclear@26: png_ptr->zstream.zfree = png_zfree; nuclear@26: png_ptr->zstream.opaque = (voidpf)png_ptr; nuclear@26: nuclear@26: switch (inflateInit(&png_ptr->zstream)) nuclear@26: { nuclear@26: case Z_OK: /* Do nothing */ break; nuclear@26: case Z_MEM_ERROR: nuclear@26: case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break; nuclear@26: case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break; nuclear@26: default: png_error(png_ptr, "Unknown zlib error"); nuclear@26: } nuclear@26: nuclear@26: png_ptr->zstream.next_out = png_ptr->zbuf; nuclear@26: png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; nuclear@26: nuclear@26: png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); nuclear@26: } nuclear@26: nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED nuclear@26: /* Read the information before the actual image data. This has been nuclear@26: * changed in v0.90 to allow reading a file that already has the magic nuclear@26: * bytes read from the stream. You can tell libpng how many bytes have nuclear@26: * been read from the beginning of the stream (up to the maximum of 8) nuclear@26: * via png_set_sig_bytes(), and we will only check the remaining bytes nuclear@26: * here. The application can then have access to the signature bytes we nuclear@26: * read if it is determined that this isn't a valid PNG file. nuclear@26: */ nuclear@26: void PNGAPI nuclear@26: png_read_info(png_structp png_ptr, png_infop info_ptr) nuclear@26: { nuclear@26: if (png_ptr == NULL || info_ptr == NULL) return; nuclear@26: png_debug(1, "in png_read_info\n"); nuclear@26: /* If we haven't checked all of the PNG signature bytes, do so now. */ nuclear@26: if (png_ptr->sig_bytes < 8) nuclear@26: { nuclear@26: png_size_t num_checked = png_ptr->sig_bytes, nuclear@26: num_to_check = 8 - num_checked; nuclear@26: nuclear@26: png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); nuclear@26: png_ptr->sig_bytes = 8; nuclear@26: nuclear@26: if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) nuclear@26: { nuclear@26: if (num_checked < 4 && nuclear@26: png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) nuclear@26: png_error(png_ptr, "Not a PNG file"); nuclear@26: else nuclear@26: png_error(png_ptr, "PNG file corrupted by ASCII conversion"); nuclear@26: } nuclear@26: if (num_checked < 3) nuclear@26: png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; nuclear@26: } nuclear@26: nuclear@26: for (;;) nuclear@26: { nuclear@26: #ifdef PNG_USE_LOCAL_ARRAYS nuclear@26: PNG_CONST PNG_IHDR; nuclear@26: PNG_CONST PNG_IDAT; nuclear@26: PNG_CONST PNG_IEND; nuclear@26: PNG_CONST PNG_PLTE; nuclear@26: #if defined(PNG_READ_bKGD_SUPPORTED) nuclear@26: PNG_CONST PNG_bKGD; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_cHRM_SUPPORTED) nuclear@26: PNG_CONST PNG_cHRM; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_gAMA_SUPPORTED) nuclear@26: PNG_CONST PNG_gAMA; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_hIST_SUPPORTED) nuclear@26: PNG_CONST PNG_hIST; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_iCCP_SUPPORTED) nuclear@26: PNG_CONST PNG_iCCP; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_iTXt_SUPPORTED) nuclear@26: PNG_CONST PNG_iTXt; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_oFFs_SUPPORTED) nuclear@26: PNG_CONST PNG_oFFs; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_pCAL_SUPPORTED) nuclear@26: PNG_CONST PNG_pCAL; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_pHYs_SUPPORTED) nuclear@26: PNG_CONST PNG_pHYs; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sBIT_SUPPORTED) nuclear@26: PNG_CONST PNG_sBIT; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sCAL_SUPPORTED) nuclear@26: PNG_CONST PNG_sCAL; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sPLT_SUPPORTED) nuclear@26: PNG_CONST PNG_sPLT; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sRGB_SUPPORTED) nuclear@26: PNG_CONST PNG_sRGB; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tEXt_SUPPORTED) nuclear@26: PNG_CONST PNG_tEXt; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tIME_SUPPORTED) nuclear@26: PNG_CONST PNG_tIME; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tRNS_SUPPORTED) nuclear@26: PNG_CONST PNG_tRNS; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_zTXt_SUPPORTED) nuclear@26: PNG_CONST PNG_zTXt; nuclear@26: #endif nuclear@26: #endif /* PNG_USE_LOCAL_ARRAYS */ nuclear@26: png_uint_32 length = png_read_chunk_header(png_ptr); nuclear@26: PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; nuclear@26: nuclear@26: /* This should be a binary subdivision search or a hash for nuclear@26: * matching the chunk name rather than a linear search. nuclear@26: */ nuclear@26: if (!png_memcmp(chunk_name, png_IDAT, 4)) nuclear@26: if (png_ptr->mode & PNG_AFTER_IDAT) nuclear@26: png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; nuclear@26: nuclear@26: if (!png_memcmp(chunk_name, png_IHDR, 4)) nuclear@26: png_handle_IHDR(png_ptr, info_ptr, length); nuclear@26: else if (!png_memcmp(chunk_name, png_IEND, 4)) nuclear@26: png_handle_IEND(png_ptr, info_ptr, length); nuclear@26: #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED nuclear@26: else if (png_handle_as_unknown(png_ptr, chunk_name)) nuclear@26: { nuclear@26: if (!png_memcmp(chunk_name, png_IDAT, 4)) nuclear@26: png_ptr->mode |= PNG_HAVE_IDAT; nuclear@26: png_handle_unknown(png_ptr, info_ptr, length); nuclear@26: if (!png_memcmp(chunk_name, png_PLTE, 4)) nuclear@26: png_ptr->mode |= PNG_HAVE_PLTE; nuclear@26: else if (!png_memcmp(chunk_name, png_IDAT, 4)) nuclear@26: { nuclear@26: if (!(png_ptr->mode & PNG_HAVE_IHDR)) nuclear@26: png_error(png_ptr, "Missing IHDR before IDAT"); nuclear@26: else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && nuclear@26: !(png_ptr->mode & PNG_HAVE_PLTE)) nuclear@26: png_error(png_ptr, "Missing PLTE before IDAT"); nuclear@26: break; nuclear@26: } nuclear@26: } nuclear@26: #endif nuclear@26: else if (!png_memcmp(chunk_name, png_PLTE, 4)) nuclear@26: png_handle_PLTE(png_ptr, info_ptr, length); nuclear@26: else if (!png_memcmp(chunk_name, png_IDAT, 4)) nuclear@26: { nuclear@26: if (!(png_ptr->mode & PNG_HAVE_IHDR)) nuclear@26: png_error(png_ptr, "Missing IHDR before IDAT"); nuclear@26: else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && nuclear@26: !(png_ptr->mode & PNG_HAVE_PLTE)) nuclear@26: png_error(png_ptr, "Missing PLTE before IDAT"); nuclear@26: nuclear@26: png_ptr->idat_size = length; nuclear@26: png_ptr->mode |= PNG_HAVE_IDAT; nuclear@26: break; nuclear@26: } nuclear@26: #if defined(PNG_READ_bKGD_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_bKGD, 4)) nuclear@26: png_handle_bKGD(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_cHRM_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_cHRM, 4)) nuclear@26: png_handle_cHRM(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_gAMA_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_gAMA, 4)) nuclear@26: png_handle_gAMA(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_hIST_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_hIST, 4)) nuclear@26: png_handle_hIST(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_oFFs_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_oFFs, 4)) nuclear@26: png_handle_oFFs(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_pCAL_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_pCAL, 4)) nuclear@26: png_handle_pCAL(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sCAL_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_sCAL, 4)) nuclear@26: png_handle_sCAL(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_pHYs_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_pHYs, 4)) nuclear@26: png_handle_pHYs(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sBIT_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_sBIT, 4)) nuclear@26: png_handle_sBIT(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sRGB_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_sRGB, 4)) nuclear@26: png_handle_sRGB(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_iCCP_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_iCCP, 4)) nuclear@26: png_handle_iCCP(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sPLT_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_sPLT, 4)) nuclear@26: png_handle_sPLT(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tEXt_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_tEXt, 4)) nuclear@26: png_handle_tEXt(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tIME_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_tIME, 4)) nuclear@26: png_handle_tIME(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tRNS_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_tRNS, 4)) nuclear@26: png_handle_tRNS(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_zTXt_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_zTXt, 4)) nuclear@26: png_handle_zTXt(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_iTXt_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_iTXt, 4)) nuclear@26: png_handle_iTXt(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: else nuclear@26: png_handle_unknown(png_ptr, info_ptr, length); nuclear@26: } nuclear@26: } nuclear@26: #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ nuclear@26: nuclear@26: /* optional call to update the users info_ptr structure */ nuclear@26: void PNGAPI nuclear@26: png_read_update_info(png_structp png_ptr, png_infop info_ptr) nuclear@26: { nuclear@26: png_debug(1, "in png_read_update_info\n"); nuclear@26: if (png_ptr == NULL) return; nuclear@26: if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) nuclear@26: png_read_start_row(png_ptr); nuclear@26: else nuclear@26: png_warning(png_ptr, nuclear@26: "Ignoring extra png_read_update_info() call; row buffer not reallocated"); nuclear@26: png_read_transform_info(png_ptr, info_ptr); nuclear@26: } nuclear@26: nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED nuclear@26: /* Initialize palette, background, etc, after transformations nuclear@26: * are set, but before any reading takes place. This allows nuclear@26: * the user to obtain a gamma-corrected palette, for example. nuclear@26: * If the user doesn't call this, we will do it ourselves. nuclear@26: */ nuclear@26: void PNGAPI nuclear@26: png_start_read_image(png_structp png_ptr) nuclear@26: { nuclear@26: png_debug(1, "in png_start_read_image\n"); nuclear@26: if (png_ptr == NULL) return; nuclear@26: if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) nuclear@26: png_read_start_row(png_ptr); nuclear@26: } nuclear@26: #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ nuclear@26: nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED nuclear@26: void PNGAPI nuclear@26: png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) nuclear@26: { nuclear@26: #ifdef PNG_USE_LOCAL_ARRAYS nuclear@26: PNG_CONST PNG_IDAT; nuclear@26: PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, nuclear@26: 0xff}; nuclear@26: PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; nuclear@26: #endif nuclear@26: int ret; nuclear@26: if (png_ptr == NULL) return; nuclear@26: png_debug2(1, "in png_read_row (row %lu, pass %d)\n", nuclear@26: png_ptr->row_number, png_ptr->pass); nuclear@26: if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) nuclear@26: png_read_start_row(png_ptr); nuclear@26: if (png_ptr->row_number == 0 && png_ptr->pass == 0) nuclear@26: { nuclear@26: /* check for transforms that have been set but were defined out */ nuclear@26: #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED) nuclear@26: if (png_ptr->transformations & PNG_INVERT_MONO) nuclear@26: png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined."); nuclear@26: #endif nuclear@26: #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED) nuclear@26: if (png_ptr->transformations & PNG_FILLER) nuclear@26: png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined."); nuclear@26: #endif nuclear@26: #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED) nuclear@26: if (png_ptr->transformations & PNG_PACKSWAP) nuclear@26: png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined."); nuclear@26: #endif nuclear@26: #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED) nuclear@26: if (png_ptr->transformations & PNG_PACK) nuclear@26: png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined."); nuclear@26: #endif nuclear@26: #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) nuclear@26: if (png_ptr->transformations & PNG_SHIFT) nuclear@26: png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined."); nuclear@26: #endif nuclear@26: #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED) nuclear@26: if (png_ptr->transformations & PNG_BGR) nuclear@26: png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined."); nuclear@26: #endif nuclear@26: #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED) nuclear@26: if (png_ptr->transformations & PNG_SWAP_BYTES) nuclear@26: png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined."); nuclear@26: #endif nuclear@26: } nuclear@26: nuclear@26: #if defined(PNG_READ_INTERLACING_SUPPORTED) nuclear@26: /* if interlaced and we do not need a new row, combine row and return */ nuclear@26: if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) nuclear@26: { nuclear@26: switch (png_ptr->pass) nuclear@26: { nuclear@26: case 0: nuclear@26: if (png_ptr->row_number & 0x07) nuclear@26: { nuclear@26: if (dsp_row != NULL) nuclear@26: png_combine_row(png_ptr, dsp_row, nuclear@26: png_pass_dsp_mask[png_ptr->pass]); nuclear@26: png_read_finish_row(png_ptr); nuclear@26: return; nuclear@26: } nuclear@26: break; nuclear@26: case 1: nuclear@26: if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) nuclear@26: { nuclear@26: if (dsp_row != NULL) nuclear@26: png_combine_row(png_ptr, dsp_row, nuclear@26: png_pass_dsp_mask[png_ptr->pass]); nuclear@26: png_read_finish_row(png_ptr); nuclear@26: return; nuclear@26: } nuclear@26: break; nuclear@26: case 2: nuclear@26: if ((png_ptr->row_number & 0x07) != 4) nuclear@26: { nuclear@26: if (dsp_row != NULL && (png_ptr->row_number & 4)) nuclear@26: png_combine_row(png_ptr, dsp_row, nuclear@26: png_pass_dsp_mask[png_ptr->pass]); nuclear@26: png_read_finish_row(png_ptr); nuclear@26: return; nuclear@26: } nuclear@26: break; nuclear@26: case 3: nuclear@26: if ((png_ptr->row_number & 3) || png_ptr->width < 3) nuclear@26: { nuclear@26: if (dsp_row != NULL) nuclear@26: png_combine_row(png_ptr, dsp_row, nuclear@26: png_pass_dsp_mask[png_ptr->pass]); nuclear@26: png_read_finish_row(png_ptr); nuclear@26: return; nuclear@26: } nuclear@26: break; nuclear@26: case 4: nuclear@26: if ((png_ptr->row_number & 3) != 2) nuclear@26: { nuclear@26: if (dsp_row != NULL && (png_ptr->row_number & 2)) nuclear@26: png_combine_row(png_ptr, dsp_row, nuclear@26: png_pass_dsp_mask[png_ptr->pass]); nuclear@26: png_read_finish_row(png_ptr); nuclear@26: return; nuclear@26: } nuclear@26: break; nuclear@26: case 5: nuclear@26: if ((png_ptr->row_number & 1) || png_ptr->width < 2) nuclear@26: { nuclear@26: if (dsp_row != NULL) nuclear@26: png_combine_row(png_ptr, dsp_row, nuclear@26: png_pass_dsp_mask[png_ptr->pass]); nuclear@26: png_read_finish_row(png_ptr); nuclear@26: return; nuclear@26: } nuclear@26: break; nuclear@26: case 6: nuclear@26: if (!(png_ptr->row_number & 1)) nuclear@26: { nuclear@26: png_read_finish_row(png_ptr); nuclear@26: return; nuclear@26: } nuclear@26: break; nuclear@26: } nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: if (!(png_ptr->mode & PNG_HAVE_IDAT)) nuclear@26: png_error(png_ptr, "Invalid attempt to read row data"); nuclear@26: nuclear@26: png_ptr->zstream.next_out = png_ptr->row_buf; nuclear@26: png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; nuclear@26: do nuclear@26: { nuclear@26: if (!(png_ptr->zstream.avail_in)) nuclear@26: { nuclear@26: while (!png_ptr->idat_size) nuclear@26: { nuclear@26: png_crc_finish(png_ptr, 0); nuclear@26: nuclear@26: png_ptr->idat_size = png_read_chunk_header(png_ptr); nuclear@26: if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) nuclear@26: png_error(png_ptr, "Not enough image data"); nuclear@26: } nuclear@26: png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; nuclear@26: png_ptr->zstream.next_in = png_ptr->zbuf; nuclear@26: if (png_ptr->zbuf_size > png_ptr->idat_size) nuclear@26: png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; nuclear@26: png_crc_read(png_ptr, png_ptr->zbuf, nuclear@26: (png_size_t)png_ptr->zstream.avail_in); nuclear@26: png_ptr->idat_size -= png_ptr->zstream.avail_in; nuclear@26: } nuclear@26: ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); nuclear@26: if (ret == Z_STREAM_END) nuclear@26: { nuclear@26: if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || nuclear@26: png_ptr->idat_size) nuclear@26: png_error(png_ptr, "Extra compressed data"); nuclear@26: png_ptr->mode |= PNG_AFTER_IDAT; nuclear@26: png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; nuclear@26: break; nuclear@26: } nuclear@26: if (ret != Z_OK) nuclear@26: png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : nuclear@26: "Decompression error"); nuclear@26: nuclear@26: } while (png_ptr->zstream.avail_out); nuclear@26: nuclear@26: png_ptr->row_info.color_type = png_ptr->color_type; nuclear@26: png_ptr->row_info.width = png_ptr->iwidth; nuclear@26: png_ptr->row_info.channels = png_ptr->channels; nuclear@26: png_ptr->row_info.bit_depth = png_ptr->bit_depth; nuclear@26: png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; nuclear@26: png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, nuclear@26: png_ptr->row_info.width); nuclear@26: nuclear@26: if (png_ptr->row_buf[0]) nuclear@26: png_read_filter_row(png_ptr, &(png_ptr->row_info), nuclear@26: png_ptr->row_buf + 1, png_ptr->prev_row + 1, nuclear@26: (int)(png_ptr->row_buf[0])); nuclear@26: nuclear@26: png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, nuclear@26: png_ptr->rowbytes + 1); nuclear@26: nuclear@26: #if defined(PNG_MNG_FEATURES_SUPPORTED) nuclear@26: if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && nuclear@26: (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) nuclear@26: { nuclear@26: /* Intrapixel differencing */ nuclear@26: png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: nuclear@26: if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) nuclear@26: png_do_read_transformations(png_ptr); nuclear@26: nuclear@26: #if defined(PNG_READ_INTERLACING_SUPPORTED) nuclear@26: /* blow up interlaced rows to full size */ nuclear@26: if (png_ptr->interlaced && nuclear@26: (png_ptr->transformations & PNG_INTERLACE)) nuclear@26: { nuclear@26: if (png_ptr->pass < 6) nuclear@26: /* old interface (pre-1.0.9): nuclear@26: png_do_read_interlace(&(png_ptr->row_info), nuclear@26: png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); nuclear@26: */ nuclear@26: png_do_read_interlace(png_ptr); nuclear@26: nuclear@26: if (dsp_row != NULL) nuclear@26: png_combine_row(png_ptr, dsp_row, nuclear@26: png_pass_dsp_mask[png_ptr->pass]); nuclear@26: if (row != NULL) nuclear@26: png_combine_row(png_ptr, row, nuclear@26: png_pass_mask[png_ptr->pass]); nuclear@26: } nuclear@26: else nuclear@26: #endif nuclear@26: { nuclear@26: if (row != NULL) nuclear@26: png_combine_row(png_ptr, row, 0xff); nuclear@26: if (dsp_row != NULL) nuclear@26: png_combine_row(png_ptr, dsp_row, 0xff); nuclear@26: } nuclear@26: png_read_finish_row(png_ptr); nuclear@26: nuclear@26: if (png_ptr->read_row_fn != NULL) nuclear@26: (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); nuclear@26: } nuclear@26: #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ nuclear@26: nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED nuclear@26: /* Read one or more rows of image data. If the image is interlaced, nuclear@26: * and png_set_interlace_handling() has been called, the rows need to nuclear@26: * contain the contents of the rows from the previous pass. If the nuclear@26: * image has alpha or transparency, and png_handle_alpha()[*] has been nuclear@26: * called, the rows contents must be initialized to the contents of the nuclear@26: * screen. nuclear@26: * nuclear@26: * "row" holds the actual image, and pixels are placed in it nuclear@26: * as they arrive. If the image is displayed after each pass, it will nuclear@26: * appear to "sparkle" in. "display_row" can be used to display a nuclear@26: * "chunky" progressive image, with finer detail added as it becomes nuclear@26: * available. If you do not want this "chunky" display, you may pass nuclear@26: * NULL for display_row. If you do not want the sparkle display, and nuclear@26: * you have not called png_handle_alpha(), you may pass NULL for rows. nuclear@26: * If you have called png_handle_alpha(), and the image has either an nuclear@26: * alpha channel or a transparency chunk, you must provide a buffer for nuclear@26: * rows. In this case, you do not have to provide a display_row buffer nuclear@26: * also, but you may. If the image is not interlaced, or if you have nuclear@26: * not called png_set_interlace_handling(), the display_row buffer will nuclear@26: * be ignored, so pass NULL to it. nuclear@26: * nuclear@26: * [*] png_handle_alpha() does not exist yet, as of this version of libpng nuclear@26: */ nuclear@26: nuclear@26: void PNGAPI nuclear@26: png_read_rows(png_structp png_ptr, png_bytepp row, nuclear@26: png_bytepp display_row, png_uint_32 num_rows) nuclear@26: { nuclear@26: png_uint_32 i; nuclear@26: png_bytepp rp; nuclear@26: png_bytepp dp; nuclear@26: nuclear@26: png_debug(1, "in png_read_rows\n"); nuclear@26: if (png_ptr == NULL) return; nuclear@26: rp = row; nuclear@26: dp = display_row; nuclear@26: if (rp != NULL && dp != NULL) nuclear@26: for (i = 0; i < num_rows; i++) nuclear@26: { nuclear@26: png_bytep rptr = *rp++; nuclear@26: png_bytep dptr = *dp++; nuclear@26: nuclear@26: png_read_row(png_ptr, rptr, dptr); nuclear@26: } nuclear@26: else if (rp != NULL) nuclear@26: for (i = 0; i < num_rows; i++) nuclear@26: { nuclear@26: png_bytep rptr = *rp; nuclear@26: png_read_row(png_ptr, rptr, png_bytep_NULL); nuclear@26: rp++; nuclear@26: } nuclear@26: else if (dp != NULL) nuclear@26: for (i = 0; i < num_rows; i++) nuclear@26: { nuclear@26: png_bytep dptr = *dp; nuclear@26: png_read_row(png_ptr, png_bytep_NULL, dptr); nuclear@26: dp++; nuclear@26: } nuclear@26: } nuclear@26: #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ nuclear@26: nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED nuclear@26: /* Read the entire image. If the image has an alpha channel or a tRNS nuclear@26: * chunk, and you have called png_handle_alpha()[*], you will need to nuclear@26: * initialize the image to the current image that PNG will be overlaying. nuclear@26: * We set the num_rows again here, in case it was incorrectly set in nuclear@26: * png_read_start_row() by a call to png_read_update_info() or nuclear@26: * png_start_read_image() if png_set_interlace_handling() wasn't called nuclear@26: * prior to either of these functions like it should have been. You can nuclear@26: * only call this function once. If you desire to have an image for nuclear@26: * each pass of a interlaced image, use png_read_rows() instead. nuclear@26: * nuclear@26: * [*] png_handle_alpha() does not exist yet, as of this version of libpng nuclear@26: */ nuclear@26: void PNGAPI nuclear@26: png_read_image(png_structp png_ptr, png_bytepp image) nuclear@26: { nuclear@26: png_uint_32 i, image_height; nuclear@26: int pass, j; nuclear@26: png_bytepp rp; nuclear@26: nuclear@26: png_debug(1, "in png_read_image\n"); nuclear@26: if (png_ptr == NULL) return; nuclear@26: nuclear@26: #ifdef PNG_READ_INTERLACING_SUPPORTED nuclear@26: pass = png_set_interlace_handling(png_ptr); nuclear@26: #else nuclear@26: if (png_ptr->interlaced) nuclear@26: png_error(png_ptr, nuclear@26: "Cannot read interlaced image -- interlace handler disabled."); nuclear@26: pass = 1; nuclear@26: #endif nuclear@26: nuclear@26: nuclear@26: image_height=png_ptr->height; nuclear@26: png_ptr->num_rows = image_height; /* Make sure this is set correctly */ nuclear@26: nuclear@26: for (j = 0; j < pass; j++) nuclear@26: { nuclear@26: rp = image; nuclear@26: for (i = 0; i < image_height; i++) nuclear@26: { nuclear@26: png_read_row(png_ptr, *rp, png_bytep_NULL); nuclear@26: rp++; nuclear@26: } nuclear@26: } nuclear@26: } nuclear@26: #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ nuclear@26: nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED nuclear@26: /* Read the end of the PNG file. Will not read past the end of the nuclear@26: * file, will verify the end is accurate, and will read any comments nuclear@26: * or time information at the end of the file, if info is not NULL. nuclear@26: */ nuclear@26: void PNGAPI nuclear@26: png_read_end(png_structp png_ptr, png_infop info_ptr) nuclear@26: { nuclear@26: png_debug(1, "in png_read_end\n"); nuclear@26: if (png_ptr == NULL) return; nuclear@26: png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ nuclear@26: nuclear@26: do nuclear@26: { nuclear@26: #ifdef PNG_USE_LOCAL_ARRAYS nuclear@26: PNG_CONST PNG_IHDR; nuclear@26: PNG_CONST PNG_IDAT; nuclear@26: PNG_CONST PNG_IEND; nuclear@26: PNG_CONST PNG_PLTE; nuclear@26: #if defined(PNG_READ_bKGD_SUPPORTED) nuclear@26: PNG_CONST PNG_bKGD; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_cHRM_SUPPORTED) nuclear@26: PNG_CONST PNG_cHRM; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_gAMA_SUPPORTED) nuclear@26: PNG_CONST PNG_gAMA; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_hIST_SUPPORTED) nuclear@26: PNG_CONST PNG_hIST; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_iCCP_SUPPORTED) nuclear@26: PNG_CONST PNG_iCCP; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_iTXt_SUPPORTED) nuclear@26: PNG_CONST PNG_iTXt; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_oFFs_SUPPORTED) nuclear@26: PNG_CONST PNG_oFFs; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_pCAL_SUPPORTED) nuclear@26: PNG_CONST PNG_pCAL; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_pHYs_SUPPORTED) nuclear@26: PNG_CONST PNG_pHYs; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sBIT_SUPPORTED) nuclear@26: PNG_CONST PNG_sBIT; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sCAL_SUPPORTED) nuclear@26: PNG_CONST PNG_sCAL; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sPLT_SUPPORTED) nuclear@26: PNG_CONST PNG_sPLT; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sRGB_SUPPORTED) nuclear@26: PNG_CONST PNG_sRGB; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tEXt_SUPPORTED) nuclear@26: PNG_CONST PNG_tEXt; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tIME_SUPPORTED) nuclear@26: PNG_CONST PNG_tIME; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tRNS_SUPPORTED) nuclear@26: PNG_CONST PNG_tRNS; nuclear@26: #endif nuclear@26: #if defined(PNG_READ_zTXt_SUPPORTED) nuclear@26: PNG_CONST PNG_zTXt; nuclear@26: #endif nuclear@26: #endif /* PNG_USE_LOCAL_ARRAYS */ nuclear@26: png_uint_32 length = png_read_chunk_header(png_ptr); nuclear@26: PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; nuclear@26: nuclear@26: if (!png_memcmp(chunk_name, png_IHDR, 4)) nuclear@26: png_handle_IHDR(png_ptr, info_ptr, length); nuclear@26: else if (!png_memcmp(chunk_name, png_IEND, 4)) nuclear@26: png_handle_IEND(png_ptr, info_ptr, length); nuclear@26: #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED nuclear@26: else if (png_handle_as_unknown(png_ptr, chunk_name)) nuclear@26: { nuclear@26: if (!png_memcmp(chunk_name, png_IDAT, 4)) nuclear@26: { nuclear@26: if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) nuclear@26: png_error(png_ptr, "Too many IDAT's found"); nuclear@26: } nuclear@26: png_handle_unknown(png_ptr, info_ptr, length); nuclear@26: if (!png_memcmp(chunk_name, png_PLTE, 4)) nuclear@26: png_ptr->mode |= PNG_HAVE_PLTE; nuclear@26: } nuclear@26: #endif nuclear@26: else if (!png_memcmp(chunk_name, png_IDAT, 4)) nuclear@26: { nuclear@26: /* Zero length IDATs are legal after the last IDAT has been nuclear@26: * read, but not after other chunks have been read. nuclear@26: */ nuclear@26: if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) nuclear@26: png_error(png_ptr, "Too many IDAT's found"); nuclear@26: png_crc_finish(png_ptr, length); nuclear@26: } nuclear@26: else if (!png_memcmp(chunk_name, png_PLTE, 4)) nuclear@26: png_handle_PLTE(png_ptr, info_ptr, length); nuclear@26: #if defined(PNG_READ_bKGD_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_bKGD, 4)) nuclear@26: png_handle_bKGD(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_cHRM_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_cHRM, 4)) nuclear@26: png_handle_cHRM(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_gAMA_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_gAMA, 4)) nuclear@26: png_handle_gAMA(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_hIST_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_hIST, 4)) nuclear@26: png_handle_hIST(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_oFFs_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_oFFs, 4)) nuclear@26: png_handle_oFFs(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_pCAL_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_pCAL, 4)) nuclear@26: png_handle_pCAL(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sCAL_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_sCAL, 4)) nuclear@26: png_handle_sCAL(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_pHYs_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_pHYs, 4)) nuclear@26: png_handle_pHYs(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sBIT_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_sBIT, 4)) nuclear@26: png_handle_sBIT(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sRGB_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_sRGB, 4)) nuclear@26: png_handle_sRGB(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_iCCP_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_iCCP, 4)) nuclear@26: png_handle_iCCP(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_sPLT_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_sPLT, 4)) nuclear@26: png_handle_sPLT(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tEXt_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_tEXt, 4)) nuclear@26: png_handle_tEXt(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tIME_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_tIME, 4)) nuclear@26: png_handle_tIME(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_tRNS_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_tRNS, 4)) nuclear@26: png_handle_tRNS(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_zTXt_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_zTXt, 4)) nuclear@26: png_handle_zTXt(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_iTXt_SUPPORTED) nuclear@26: else if (!png_memcmp(chunk_name, png_iTXt, 4)) nuclear@26: png_handle_iTXt(png_ptr, info_ptr, length); nuclear@26: #endif nuclear@26: else nuclear@26: png_handle_unknown(png_ptr, info_ptr, length); nuclear@26: } while (!(png_ptr->mode & PNG_HAVE_IEND)); nuclear@26: } nuclear@26: #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ nuclear@26: nuclear@26: /* free all memory used by the read */ nuclear@26: void PNGAPI nuclear@26: png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, nuclear@26: png_infopp end_info_ptr_ptr) nuclear@26: { nuclear@26: png_structp png_ptr = NULL; nuclear@26: png_infop info_ptr = NULL, end_info_ptr = NULL; nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_free_ptr free_fn = NULL; nuclear@26: png_voidp mem_ptr = NULL; nuclear@26: #endif nuclear@26: nuclear@26: png_debug(1, "in png_destroy_read_struct\n"); nuclear@26: if (png_ptr_ptr != NULL) nuclear@26: png_ptr = *png_ptr_ptr; nuclear@26: if (png_ptr == NULL) nuclear@26: return; nuclear@26: nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: free_fn = png_ptr->free_fn; nuclear@26: mem_ptr = png_ptr->mem_ptr; nuclear@26: #endif nuclear@26: nuclear@26: if (info_ptr_ptr != NULL) nuclear@26: info_ptr = *info_ptr_ptr; nuclear@26: nuclear@26: if (end_info_ptr_ptr != NULL) nuclear@26: end_info_ptr = *end_info_ptr_ptr; nuclear@26: nuclear@26: png_read_destroy(png_ptr, info_ptr, end_info_ptr); nuclear@26: nuclear@26: if (info_ptr != NULL) nuclear@26: { nuclear@26: #if defined(PNG_TEXT_SUPPORTED) nuclear@26: png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); nuclear@26: #endif nuclear@26: nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, nuclear@26: (png_voidp)mem_ptr); nuclear@26: #else nuclear@26: png_destroy_struct((png_voidp)info_ptr); nuclear@26: #endif nuclear@26: *info_ptr_ptr = NULL; nuclear@26: } nuclear@26: nuclear@26: if (end_info_ptr != NULL) nuclear@26: { nuclear@26: #if defined(PNG_READ_TEXT_SUPPORTED) nuclear@26: png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); nuclear@26: #endif nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, nuclear@26: (png_voidp)mem_ptr); nuclear@26: #else nuclear@26: png_destroy_struct((png_voidp)end_info_ptr); nuclear@26: #endif nuclear@26: *end_info_ptr_ptr = NULL; nuclear@26: } nuclear@26: nuclear@26: if (png_ptr != NULL) nuclear@26: { nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, nuclear@26: (png_voidp)mem_ptr); nuclear@26: #else nuclear@26: png_destroy_struct((png_voidp)png_ptr); nuclear@26: #endif nuclear@26: *png_ptr_ptr = NULL; nuclear@26: } nuclear@26: } nuclear@26: nuclear@26: /* free all memory used by the read (old method) */ nuclear@26: void /* PRIVATE */ nuclear@26: png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr) nuclear@26: { nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: jmp_buf tmp_jmp; nuclear@26: #endif nuclear@26: png_error_ptr error_fn; nuclear@26: png_error_ptr warning_fn; nuclear@26: png_voidp error_ptr; nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_free_ptr free_fn; nuclear@26: #endif nuclear@26: nuclear@26: png_debug(1, "in png_read_destroy\n"); nuclear@26: if (info_ptr != NULL) nuclear@26: png_info_destroy(png_ptr, info_ptr); nuclear@26: nuclear@26: if (end_info_ptr != NULL) nuclear@26: png_info_destroy(png_ptr, end_info_ptr); nuclear@26: nuclear@26: png_free(png_ptr, png_ptr->zbuf); nuclear@26: png_free(png_ptr, png_ptr->big_row_buf); nuclear@26: png_free(png_ptr, png_ptr->prev_row); nuclear@26: png_free(png_ptr, png_ptr->chunkdata); nuclear@26: #if defined(PNG_READ_DITHER_SUPPORTED) nuclear@26: png_free(png_ptr, png_ptr->palette_lookup); nuclear@26: png_free(png_ptr, png_ptr->dither_index); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED) nuclear@26: png_free(png_ptr, png_ptr->gamma_table); nuclear@26: #endif nuclear@26: #if defined(PNG_READ_BACKGROUND_SUPPORTED) nuclear@26: png_free(png_ptr, png_ptr->gamma_from_1); nuclear@26: png_free(png_ptr, png_ptr->gamma_to_1); nuclear@26: #endif nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if (png_ptr->free_me & PNG_FREE_PLTE) nuclear@26: png_zfree(png_ptr, png_ptr->palette); nuclear@26: png_ptr->free_me &= ~PNG_FREE_PLTE; nuclear@26: #else nuclear@26: if (png_ptr->flags & PNG_FLAG_FREE_PLTE) nuclear@26: png_zfree(png_ptr, png_ptr->palette); nuclear@26: png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; nuclear@26: #endif nuclear@26: #if defined(PNG_tRNS_SUPPORTED) || \ nuclear@26: defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if (png_ptr->free_me & PNG_FREE_TRNS) nuclear@26: png_free(png_ptr, png_ptr->trans); nuclear@26: png_ptr->free_me &= ~PNG_FREE_TRNS; nuclear@26: #else nuclear@26: if (png_ptr->flags & PNG_FLAG_FREE_TRNS) nuclear@26: png_free(png_ptr, png_ptr->trans); nuclear@26: png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; nuclear@26: #endif nuclear@26: #endif nuclear@26: #if defined(PNG_READ_hIST_SUPPORTED) nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if (png_ptr->free_me & PNG_FREE_HIST) nuclear@26: png_free(png_ptr, png_ptr->hist); nuclear@26: png_ptr->free_me &= ~PNG_FREE_HIST; nuclear@26: #else nuclear@26: if (png_ptr->flags & PNG_FLAG_FREE_HIST) nuclear@26: png_free(png_ptr, png_ptr->hist); nuclear@26: png_ptr->flags &= ~PNG_FLAG_FREE_HIST; nuclear@26: #endif nuclear@26: #endif nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED) nuclear@26: if (png_ptr->gamma_16_table != NULL) nuclear@26: { nuclear@26: int i; nuclear@26: int istop = (1 << (8 - png_ptr->gamma_shift)); nuclear@26: for (i = 0; i < istop; i++) nuclear@26: { nuclear@26: png_free(png_ptr, png_ptr->gamma_16_table[i]); nuclear@26: } nuclear@26: png_free(png_ptr, png_ptr->gamma_16_table); nuclear@26: } nuclear@26: #if defined(PNG_READ_BACKGROUND_SUPPORTED) nuclear@26: if (png_ptr->gamma_16_from_1 != NULL) nuclear@26: { nuclear@26: int i; nuclear@26: int istop = (1 << (8 - png_ptr->gamma_shift)); nuclear@26: for (i = 0; i < istop; i++) nuclear@26: { nuclear@26: png_free(png_ptr, png_ptr->gamma_16_from_1[i]); nuclear@26: } nuclear@26: png_free(png_ptr, png_ptr->gamma_16_from_1); nuclear@26: } nuclear@26: if (png_ptr->gamma_16_to_1 != NULL) nuclear@26: { nuclear@26: int i; nuclear@26: int istop = (1 << (8 - png_ptr->gamma_shift)); nuclear@26: for (i = 0; i < istop; i++) nuclear@26: { nuclear@26: png_free(png_ptr, png_ptr->gamma_16_to_1[i]); nuclear@26: } nuclear@26: png_free(png_ptr, png_ptr->gamma_16_to_1); nuclear@26: } nuclear@26: #endif nuclear@26: #endif nuclear@26: #if defined(PNG_TIME_RFC1123_SUPPORTED) nuclear@26: png_free(png_ptr, png_ptr->time_buffer); nuclear@26: #endif nuclear@26: nuclear@26: inflateEnd(&png_ptr->zstream); nuclear@26: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED nuclear@26: png_free(png_ptr, png_ptr->save_buffer); nuclear@26: #endif nuclear@26: nuclear@26: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED nuclear@26: #ifdef PNG_TEXT_SUPPORTED nuclear@26: png_free(png_ptr, png_ptr->current_text); nuclear@26: #endif /* PNG_TEXT_SUPPORTED */ nuclear@26: #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ nuclear@26: nuclear@26: /* Save the important info out of the png_struct, in case it is nuclear@26: * being used again. nuclear@26: */ nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); nuclear@26: #endif nuclear@26: nuclear@26: error_fn = png_ptr->error_fn; nuclear@26: warning_fn = png_ptr->warning_fn; nuclear@26: error_ptr = png_ptr->error_ptr; nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: free_fn = png_ptr->free_fn; nuclear@26: #endif nuclear@26: nuclear@26: png_memset(png_ptr, 0, png_sizeof(png_struct)); nuclear@26: nuclear@26: png_ptr->error_fn = error_fn; nuclear@26: png_ptr->warning_fn = warning_fn; nuclear@26: png_ptr->error_ptr = error_ptr; nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_ptr->free_fn = free_fn; nuclear@26: #endif nuclear@26: nuclear@26: #ifdef PNG_SETJMP_SUPPORTED nuclear@26: png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); nuclear@26: #endif nuclear@26: nuclear@26: } nuclear@26: nuclear@26: void PNGAPI nuclear@26: png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) nuclear@26: { nuclear@26: if (png_ptr == NULL) return; nuclear@26: png_ptr->read_row_fn = read_row_fn; nuclear@26: } nuclear@26: nuclear@26: nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED nuclear@26: #if defined(PNG_INFO_IMAGE_SUPPORTED) nuclear@26: void PNGAPI nuclear@26: png_read_png(png_structp png_ptr, png_infop info_ptr, nuclear@26: int transforms, nuclear@26: voidp params) nuclear@26: { nuclear@26: int row; nuclear@26: nuclear@26: if (png_ptr == NULL) return; nuclear@26: #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) nuclear@26: /* invert the alpha channel from opacity to transparency nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_INVERT_ALPHA) nuclear@26: png_set_invert_alpha(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: /* png_read_info() gives us all of the information from the nuclear@26: * PNG file before the first IDAT (image data chunk). nuclear@26: */ nuclear@26: png_read_info(png_ptr, info_ptr); nuclear@26: if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) nuclear@26: png_error(png_ptr, "Image is too high to process with png_read_png()"); nuclear@26: nuclear@26: /* -------------- image transformations start here ------------------- */ nuclear@26: nuclear@26: #if defined(PNG_READ_16_TO_8_SUPPORTED) nuclear@26: /* tell libpng to strip 16 bit/color files down to 8 bits per color nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_STRIP_16) nuclear@26: png_set_strip_16(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) nuclear@26: /* Strip alpha bytes from the input data without combining with nuclear@26: * the background (not recommended). nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_STRIP_ALPHA) nuclear@26: png_set_strip_alpha(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) nuclear@26: /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single nuclear@26: * byte into separate bytes (useful for paletted and grayscale images). nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_PACKING) nuclear@26: png_set_packing(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_READ_PACKSWAP_SUPPORTED) nuclear@26: /* Change the order of packed pixels to least significant bit first nuclear@26: * (not useful if you are using png_set_packing). nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_PACKSWAP) nuclear@26: png_set_packswap(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_READ_EXPAND_SUPPORTED) nuclear@26: /* Expand paletted colors into true RGB triplets nuclear@26: * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel nuclear@26: * Expand paletted or RGB images with transparency to full alpha nuclear@26: * channels so the data will be available as RGBA quartets. nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_EXPAND) nuclear@26: if ((png_ptr->bit_depth < 8) || nuclear@26: (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || nuclear@26: (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) nuclear@26: png_set_expand(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: /* We don't handle background color or gamma transformation or dithering. nuclear@26: */ nuclear@26: nuclear@26: #if defined(PNG_READ_INVERT_SUPPORTED) nuclear@26: /* invert monochrome files to have 0 as white and 1 as black nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_INVERT_MONO) nuclear@26: png_set_invert_mono(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_READ_SHIFT_SUPPORTED) nuclear@26: /* If you want to shift the pixel values from the range [0,255] or nuclear@26: * [0,65535] to the original [0,7] or [0,31], or whatever range the nuclear@26: * colors were originally in: nuclear@26: */ nuclear@26: if ((transforms & PNG_TRANSFORM_SHIFT) nuclear@26: && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT)) nuclear@26: { nuclear@26: png_color_8p sig_bit; nuclear@26: nuclear@26: png_get_sBIT(png_ptr, info_ptr, &sig_bit); nuclear@26: png_set_shift(png_ptr, sig_bit); nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_READ_BGR_SUPPORTED) nuclear@26: /* flip the RGB pixels to BGR (or RGBA to BGRA) nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_BGR) nuclear@26: png_set_bgr(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) nuclear@26: /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_SWAP_ALPHA) nuclear@26: png_set_swap_alpha(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_READ_SWAP_SUPPORTED) nuclear@26: /* swap bytes of 16 bit files to least significant byte first nuclear@26: */ nuclear@26: if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) nuclear@26: png_set_swap(png_ptr); nuclear@26: #endif nuclear@26: nuclear@26: /* We don't handle adding filler bytes */ nuclear@26: nuclear@26: /* Optional call to gamma correct and add the background to the palette nuclear@26: * and update info structure. REQUIRED if you are expecting libpng to nuclear@26: * update the palette for you (i.e., you selected such a transform above). nuclear@26: */ nuclear@26: png_read_update_info(png_ptr, info_ptr); nuclear@26: nuclear@26: /* -------------- image transformations end here ------------------- */ nuclear@26: nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); nuclear@26: #endif nuclear@26: if (info_ptr->row_pointers == NULL) nuclear@26: { nuclear@26: info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, nuclear@26: info_ptr->height * png_sizeof(png_bytep)); nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: info_ptr->free_me |= PNG_FREE_ROWS; nuclear@26: #endif nuclear@26: for (row = 0; row < (int)info_ptr->height; row++) nuclear@26: { nuclear@26: info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, nuclear@26: png_get_rowbytes(png_ptr, info_ptr)); nuclear@26: } nuclear@26: } nuclear@26: nuclear@26: png_read_image(png_ptr, info_ptr->row_pointers); nuclear@26: info_ptr->valid |= PNG_INFO_IDAT; nuclear@26: nuclear@26: /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ nuclear@26: png_read_end(png_ptr, info_ptr); nuclear@26: nuclear@26: transforms = transforms; /* quiet compiler warnings */ nuclear@26: params = params; nuclear@26: nuclear@26: } nuclear@26: #endif /* PNG_INFO_IMAGE_SUPPORTED */ nuclear@26: #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ nuclear@26: #endif /* PNG_READ_SUPPORTED */