1471 lines
46 KiB
C
1471 lines
46 KiB
C
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/* pngread.c - read a PNG file
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*
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* Last changed in libpng 1.2.37 [May 31, 2009]
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* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* This file contains routines that an application calls directly to
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* read a PNG file or stream.
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*/
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#define PNG_INTERNAL
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#include "png.h"
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#if defined(PNG_READ_SUPPORTED)
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/* Create a PNG structure for reading, and allocate any memory needed. */
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png_structp PNGAPI
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png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
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png_error_ptr error_fn, png_error_ptr warn_fn)
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{
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#ifdef PNG_USER_MEM_SUPPORTED
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return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
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warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
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}
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/* Alternate create PNG structure for reading, and allocate any memory needed. */
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png_structp PNGAPI
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png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
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png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
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png_malloc_ptr malloc_fn, png_free_ptr free_fn)
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{
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#endif /* PNG_USER_MEM_SUPPORTED */
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#ifdef PNG_SETJMP_SUPPORTED
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volatile
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#endif
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png_structp png_ptr;
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#ifdef PNG_SETJMP_SUPPORTED
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#ifdef USE_FAR_KEYWORD
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jmp_buf jmpbuf;
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#endif
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#endif
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int i;
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png_debug(1, "in png_create_read_struct");
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#ifdef PNG_USER_MEM_SUPPORTED
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png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
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(png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
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#else
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png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
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#endif
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if (png_ptr == NULL)
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return (NULL);
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/* Added at libpng-1.2.6 */
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#ifdef PNG_SET_USER_LIMITS_SUPPORTED
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png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
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png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
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#endif
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#ifdef PNG_SETJMP_SUPPORTED
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#ifdef USE_FAR_KEYWORD
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if (setjmp(jmpbuf))
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#else
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if (setjmp(png_ptr->jmpbuf))
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#endif
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{
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png_free(png_ptr, png_ptr->zbuf);
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png_ptr->zbuf = NULL;
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#ifdef PNG_USER_MEM_SUPPORTED
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png_destroy_struct_2((png_voidp)png_ptr,
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(png_free_ptr)free_fn, (png_voidp)mem_ptr);
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#else
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png_destroy_struct((png_voidp)png_ptr);
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#endif
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return (NULL);
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}
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#ifdef USE_FAR_KEYWORD
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png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
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#endif
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#endif
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#ifdef PNG_USER_MEM_SUPPORTED
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png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
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#endif
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png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
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if (user_png_ver)
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{
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i = 0;
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do
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{
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if (user_png_ver[i] != png_libpng_ver[i])
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png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
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} while (png_libpng_ver[i++]);
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}
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else
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png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
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if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
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{
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/* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
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* we must recompile any applications that use any older library version.
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* For versions after libpng 1.0, we will be compatible, so we need
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* only check the first digit.
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*/
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if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
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(user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
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(user_png_ver[0] == '0' && user_png_ver[2] < '9'))
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{
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#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
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char msg[80];
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if (user_png_ver)
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{
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png_snprintf(msg, 80,
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"Application was compiled with png.h from libpng-%.20s",
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user_png_ver);
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png_warning(png_ptr, msg);
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}
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png_snprintf(msg, 80,
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"Application is running with png.c from libpng-%.20s",
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png_libpng_ver);
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png_warning(png_ptr, msg);
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#endif
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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png_ptr->flags = 0;
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#endif
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png_error(png_ptr,
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"Incompatible libpng version in application and library");
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}
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}
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/* Initialize zbuf - compression buffer */
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png_ptr->zbuf_size = PNG_ZBUF_SIZE;
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png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
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(png_uint_32)png_ptr->zbuf_size);
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png_ptr->zstream.zalloc = png_zalloc;
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png_ptr->zstream.zfree = png_zfree;
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png_ptr->zstream.opaque = (voidpf)png_ptr;
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switch (inflateInit(&png_ptr->zstream))
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{
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case Z_OK: /* Do nothing */ break;
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case Z_MEM_ERROR:
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case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
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case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
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default: png_error(png_ptr, "Unknown zlib error");
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}
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png_ptr->zstream.next_out = png_ptr->zbuf;
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
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#ifdef PNG_SETJMP_SUPPORTED
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/* Applications that neglect to set up their own setjmp() and then encounter
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a png_error() will longjmp here. Since the jmpbuf is then meaningless we
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abort instead of returning. */
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#ifdef USE_FAR_KEYWORD
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if (setjmp(jmpbuf))
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PNG_ABORT();
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png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
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#else
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if (setjmp(png_ptr->jmpbuf))
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PNG_ABORT();
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#endif
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#endif
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return (png_ptr);
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}
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#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
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/* Initialize PNG structure for reading, and allocate any memory needed.
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This interface is deprecated in favour of the png_create_read_struct(),
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and it will disappear as of libpng-1.3.0. */
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#undef png_read_init
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void PNGAPI
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png_read_init(png_structp png_ptr)
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{
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/* We only come here via pre-1.0.7-compiled applications */
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png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
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}
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void PNGAPI
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png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
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png_size_t png_struct_size, png_size_t png_info_size)
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{
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/* We only come here via pre-1.0.12-compiled applications */
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if (png_ptr == NULL)
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return;
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#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
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if (png_sizeof(png_struct) > png_struct_size ||
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png_sizeof(png_info) > png_info_size)
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{
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char msg[80];
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png_ptr->warning_fn = NULL;
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if (user_png_ver)
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{
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png_snprintf(msg, 80,
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"Application was compiled with png.h from libpng-%.20s",
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user_png_ver);
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png_warning(png_ptr, msg);
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}
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png_snprintf(msg, 80,
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"Application is running with png.c from libpng-%.20s",
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png_libpng_ver);
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png_warning(png_ptr, msg);
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}
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#endif
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if (png_sizeof(png_struct) > png_struct_size)
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{
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png_ptr->error_fn = NULL;
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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png_ptr->flags = 0;
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#endif
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png_error(png_ptr,
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"The png struct allocated by the application for reading is too small.");
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}
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if (png_sizeof(png_info) > png_info_size)
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{
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png_ptr->error_fn = NULL;
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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png_ptr->flags = 0;
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#endif
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png_error(png_ptr,
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"The info struct allocated by application for reading is too small.");
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}
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png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
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}
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#endif /* PNG_1_0_X || PNG_1_2_X */
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void PNGAPI
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png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
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png_size_t png_struct_size)
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{
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#ifdef PNG_SETJMP_SUPPORTED
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jmp_buf tmp_jmp; /* to save current jump buffer */
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#endif
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int i = 0;
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png_structp png_ptr=*ptr_ptr;
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if (png_ptr == NULL)
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return;
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do
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{
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if (user_png_ver[i] != png_libpng_ver[i])
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{
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#ifdef PNG_LEGACY_SUPPORTED
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png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
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#else
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png_ptr->warning_fn = NULL;
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png_warning(png_ptr,
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"Application uses deprecated png_read_init() and should be recompiled.");
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break;
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#endif
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}
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} while (png_libpng_ver[i++]);
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png_debug(1, "in png_read_init_3");
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#ifdef PNG_SETJMP_SUPPORTED
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/* Save jump buffer and error functions */
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png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
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#endif
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if (png_sizeof(png_struct) > png_struct_size)
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{
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png_destroy_struct(png_ptr);
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*ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
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png_ptr = *ptr_ptr;
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}
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/* Reset all variables to 0 */
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png_memset(png_ptr, 0, png_sizeof(png_struct));
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#ifdef PNG_SETJMP_SUPPORTED
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/* Restore jump buffer */
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png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
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#endif
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/* Added at libpng-1.2.6 */
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#ifdef PNG_SET_USER_LIMITS_SUPPORTED
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png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
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png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
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#endif
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/* Initialize zbuf - compression buffer */
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png_ptr->zbuf_size = PNG_ZBUF_SIZE;
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png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
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(png_uint_32)png_ptr->zbuf_size);
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png_ptr->zstream.zalloc = png_zalloc;
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png_ptr->zstream.zfree = png_zfree;
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png_ptr->zstream.opaque = (voidpf)png_ptr;
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switch (inflateInit(&png_ptr->zstream))
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{
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case Z_OK: /* Do nothing */ break;
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case Z_MEM_ERROR:
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case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
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case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
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default: png_error(png_ptr, "Unknown zlib error");
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}
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png_ptr->zstream.next_out = png_ptr->zbuf;
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
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}
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#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
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/* Read the information before the actual image data. This has been
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* changed in v0.90 to allow reading a file that already has the magic
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* bytes read from the stream. You can tell libpng how many bytes have
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* been read from the beginning of the stream (up to the maximum of 8)
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* via png_set_sig_bytes(), and we will only check the remaining bytes
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* here. The application can then have access to the signature bytes we
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* read if it is determined that this isn't a valid PNG file.
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*/
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void PNGAPI
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png_read_info(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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png_debug(1, "in png_read_info");
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/* If we haven't checked all of the PNG signature bytes, do so now. */
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if (png_ptr->sig_bytes < 8)
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{
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png_size_t num_checked = png_ptr->sig_bytes,
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num_to_check = 8 - num_checked;
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png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
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png_ptr->sig_bytes = 8;
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if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
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{
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if (num_checked < 4 &&
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png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
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png_error(png_ptr, "Not a PNG file");
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else
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png_error(png_ptr, "PNG file corrupted by ASCII conversion");
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}
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if (num_checked < 3)
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png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
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}
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for (;;)
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{
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#ifdef PNG_USE_LOCAL_ARRAYS
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PNG_CONST PNG_IHDR;
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PNG_CONST PNG_IDAT;
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PNG_CONST PNG_IEND;
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PNG_CONST PNG_PLTE;
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#if defined(PNG_READ_bKGD_SUPPORTED)
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PNG_CONST PNG_bKGD;
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#endif
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#if defined(PNG_READ_cHRM_SUPPORTED)
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PNG_CONST PNG_cHRM;
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#endif
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#if defined(PNG_READ_gAMA_SUPPORTED)
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PNG_CONST PNG_gAMA;
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#endif
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#if defined(PNG_READ_hIST_SUPPORTED)
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PNG_CONST PNG_hIST;
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#endif
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#if defined(PNG_READ_iCCP_SUPPORTED)
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PNG_CONST PNG_iCCP;
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#endif
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#if defined(PNG_READ_iTXt_SUPPORTED)
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PNG_CONST PNG_iTXt;
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#endif
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#if defined(PNG_READ_oFFs_SUPPORTED)
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PNG_CONST PNG_oFFs;
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#endif
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#if defined(PNG_READ_pCAL_SUPPORTED)
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PNG_CONST PNG_pCAL;
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#endif
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#if defined(PNG_READ_pHYs_SUPPORTED)
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PNG_CONST PNG_pHYs;
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#endif
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#if defined(PNG_READ_sBIT_SUPPORTED)
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PNG_CONST PNG_sBIT;
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#endif
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#if defined(PNG_READ_sCAL_SUPPORTED)
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PNG_CONST PNG_sCAL;
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#endif
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#if defined(PNG_READ_sPLT_SUPPORTED)
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PNG_CONST PNG_sPLT;
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#endif
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#if defined(PNG_READ_sRGB_SUPPORTED)
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PNG_CONST PNG_sRGB;
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#endif
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#if defined(PNG_READ_tEXt_SUPPORTED)
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PNG_CONST PNG_tEXt;
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#endif
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#if defined(PNG_READ_tIME_SUPPORTED)
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PNG_CONST PNG_tIME;
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#endif
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#if defined(PNG_READ_tRNS_SUPPORTED)
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PNG_CONST PNG_tRNS;
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#endif
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#if defined(PNG_READ_zTXt_SUPPORTED)
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PNG_CONST PNG_zTXt;
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#endif
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#endif /* PNG_USE_LOCAL_ARRAYS */
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png_uint_32 length = png_read_chunk_header(png_ptr);
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PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
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/* This should be a binary subdivision search or a hash for
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* matching the chunk name rather than a linear search.
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*/
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if (!png_memcmp(chunk_name, png_IDAT, 4))
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if (png_ptr->mode & PNG_AFTER_IDAT)
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png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
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if (!png_memcmp(chunk_name, png_IHDR, 4))
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png_handle_IHDR(png_ptr, info_ptr, length);
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else if (!png_memcmp(chunk_name, png_IEND, 4))
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png_handle_IEND(png_ptr, info_ptr, length);
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#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
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else if (png_handle_as_unknown(png_ptr, chunk_name))
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{
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if (!png_memcmp(chunk_name, png_IDAT, 4))
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png_ptr->mode |= PNG_HAVE_IDAT;
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png_handle_unknown(png_ptr, info_ptr, length);
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if (!png_memcmp(chunk_name, png_PLTE, 4))
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png_ptr->mode |= PNG_HAVE_PLTE;
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else if (!png_memcmp(chunk_name, png_IDAT, 4))
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{
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if (!(png_ptr->mode & PNG_HAVE_IHDR))
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png_error(png_ptr, "Missing IHDR before IDAT");
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else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
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!(png_ptr->mode & PNG_HAVE_PLTE))
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png_error(png_ptr, "Missing PLTE before IDAT");
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break;
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}
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}
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#endif
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else if (!png_memcmp(chunk_name, png_PLTE, 4))
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png_handle_PLTE(png_ptr, info_ptr, length);
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else if (!png_memcmp(chunk_name, png_IDAT, 4))
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{
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if (!(png_ptr->mode & PNG_HAVE_IHDR))
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png_error(png_ptr, "Missing IHDR before IDAT");
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else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
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!(png_ptr->mode & PNG_HAVE_PLTE))
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png_error(png_ptr, "Missing PLTE before IDAT");
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png_ptr->idat_size = length;
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png_ptr->mode |= PNG_HAVE_IDAT;
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break;
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}
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#if defined(PNG_READ_bKGD_SUPPORTED)
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else if (!png_memcmp(chunk_name, png_bKGD, 4))
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png_handle_bKGD(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(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(chunk_name, png_gAMA, 4))
|
|
png_handle_gAMA(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(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(chunk_name, png_oFFs, 4))
|
|
png_handle_oFFs(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_pCAL_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_pCAL, 4))
|
|
png_handle_pCAL(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_sCAL_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_sCAL, 4))
|
|
png_handle_sCAL(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(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(chunk_name, png_sBIT, 4))
|
|
png_handle_sBIT(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_sRGB_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_sRGB, 4))
|
|
png_handle_sRGB(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_iCCP_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_iCCP, 4))
|
|
png_handle_iCCP(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_sPLT_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_sPLT, 4))
|
|
png_handle_sPLT(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_tEXt_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_tEXt, 4))
|
|
png_handle_tEXt(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(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(chunk_name, png_tRNS, 4))
|
|
png_handle_tRNS(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_zTXt_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_zTXt, 4))
|
|
png_handle_zTXt(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_iTXt_SUPPORTED)
|
|
else if (!png_memcmp(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_NO_SEQUENTIAL_READ_SUPPORTED */
|
|
|
|
/* Optional call to update the users info_ptr structure */
|
|
void PNGAPI
|
|
png_read_update_info(png_structp png_ptr, png_infop info_ptr)
|
|
{
|
|
png_debug(1, "in png_read_update_info");
|
|
if (png_ptr == NULL)
|
|
return;
|
|
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
|
|
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);
|
|
}
|
|
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
/* Initialize palette, background, etc, after transformations
|
|
* are set, but before any reading takes place. This allows
|
|
* the user to obtain a gamma-corrected palette, for example.
|
|
* If the user doesn't call this, we will do it ourselves.
|
|
*/
|
|
void PNGAPI
|
|
png_start_read_image(png_structp png_ptr)
|
|
{
|
|
png_debug(1, "in png_start_read_image");
|
|
if (png_ptr == NULL)
|
|
return;
|
|
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
|
|
png_read_start_row(png_ptr);
|
|
}
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
|
|
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
void PNGAPI
|
|
png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
|
|
{
|
|
#ifdef PNG_USE_LOCAL_ARRAYS
|
|
PNG_CONST PNG_IDAT;
|
|
PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
|
|
0xff};
|
|
PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
|
|
#endif
|
|
int ret;
|
|
if (png_ptr == NULL)
|
|
return;
|
|
png_debug2(1, "in png_read_row (row %lu, pass %d)",
|
|
png_ptr->row_number, png_ptr->pass);
|
|
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
|
|
png_read_start_row(png_ptr);
|
|
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
|
|
{
|
|
/* 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 */
|
|
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
|
|
{
|
|
switch (png_ptr->pass)
|
|
{
|
|
case 0:
|
|
if (png_ptr->row_number & 0x07)
|
|
{
|
|
if (dsp_row != NULL)
|
|
png_combine_row(png_ptr, dsp_row,
|
|
png_pass_dsp_mask[png_ptr->pass]);
|
|
png_read_finish_row(png_ptr);
|
|
return;
|
|
}
|
|
break;
|
|
case 1:
|
|
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
|
|
{
|
|
if (dsp_row != NULL)
|
|
png_combine_row(png_ptr, dsp_row,
|
|
png_pass_dsp_mask[png_ptr->pass]);
|
|
png_read_finish_row(png_ptr);
|
|
return;
|
|
}
|
|
break;
|
|
case 2:
|
|
if ((png_ptr->row_number & 0x07) != 4)
|
|
{
|
|
if (dsp_row != NULL && (png_ptr->row_number & 4))
|
|
png_combine_row(png_ptr, dsp_row,
|
|
png_pass_dsp_mask[png_ptr->pass]);
|
|
png_read_finish_row(png_ptr);
|
|
return;
|
|
}
|
|
break;
|
|
case 3:
|
|
if ((png_ptr->row_number & 3) || png_ptr->width < 3)
|
|
{
|
|
if (dsp_row != NULL)
|
|
png_combine_row(png_ptr, dsp_row,
|
|
png_pass_dsp_mask[png_ptr->pass]);
|
|
png_read_finish_row(png_ptr);
|
|
return;
|
|
}
|
|
break;
|
|
case 4:
|
|
if ((png_ptr->row_number & 3) != 2)
|
|
{
|
|
if (dsp_row != NULL && (png_ptr->row_number & 2))
|
|
png_combine_row(png_ptr, dsp_row,
|
|
png_pass_dsp_mask[png_ptr->pass]);
|
|
png_read_finish_row(png_ptr);
|
|
return;
|
|
}
|
|
break;
|
|
case 5:
|
|
if ((png_ptr->row_number & 1) || png_ptr->width < 2)
|
|
{
|
|
if (dsp_row != NULL)
|
|
png_combine_row(png_ptr, dsp_row,
|
|
png_pass_dsp_mask[png_ptr->pass]);
|
|
png_read_finish_row(png_ptr);
|
|
return;
|
|
}
|
|
break;
|
|
case 6:
|
|
if (!(png_ptr->row_number & 1))
|
|
{
|
|
png_read_finish_row(png_ptr);
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (!(png_ptr->mode & PNG_HAVE_IDAT))
|
|
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;
|
|
do
|
|
{
|
|
if (!(png_ptr->zstream.avail_in))
|
|
{
|
|
while (!png_ptr->idat_size)
|
|
{
|
|
png_crc_finish(png_ptr, 0);
|
|
|
|
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");
|
|
}
|
|
png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
|
|
png_ptr->zstream.next_in = png_ptr->zbuf;
|
|
if (png_ptr->zbuf_size > png_ptr->idat_size)
|
|
png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
|
|
png_crc_read(png_ptr, png_ptr->zbuf,
|
|
(png_size_t)png_ptr->zstream.avail_in);
|
|
png_ptr->idat_size -= png_ptr->zstream.avail_in;
|
|
}
|
|
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
|
|
if (ret == Z_STREAM_END)
|
|
{
|
|
if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
|
|
png_ptr->idat_size)
|
|
png_error(png_ptr, "Extra compressed data");
|
|
png_ptr->mode |= PNG_AFTER_IDAT;
|
|
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
|
|
break;
|
|
}
|
|
if (ret != Z_OK)
|
|
png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
|
|
"Decompression error");
|
|
|
|
} while (png_ptr->zstream.avail_out);
|
|
|
|
png_ptr->row_info.color_type = png_ptr->color_type;
|
|
png_ptr->row_info.width = png_ptr->iwidth;
|
|
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_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);
|
|
|
|
#if defined(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 */
|
|
if (png_ptr->interlaced &&
|
|
(png_ptr->transformations & PNG_INTERLACE))
|
|
{
|
|
if (png_ptr->pass < 6)
|
|
/* Old interface (pre-1.0.9):
|
|
* png_do_read_interlace(&(png_ptr->row_info),
|
|
* png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
|
|
*/
|
|
png_do_read_interlace(png_ptr);
|
|
|
|
if (dsp_row != NULL)
|
|
png_combine_row(png_ptr, dsp_row,
|
|
png_pass_dsp_mask[png_ptr->pass]);
|
|
if (row != NULL)
|
|
png_combine_row(png_ptr, row,
|
|
png_pass_mask[png_ptr->pass]);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
if (row != NULL)
|
|
png_combine_row(png_ptr, row, 0xff);
|
|
if (dsp_row != NULL)
|
|
png_combine_row(png_ptr, dsp_row, 0xff);
|
|
}
|
|
png_read_finish_row(png_ptr);
|
|
|
|
if (png_ptr->read_row_fn != NULL)
|
|
(*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
|
|
}
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
|
|
|
|
#ifndef PNG_NO_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
|
|
* 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
|
|
* "chunky" progressive image, with finer detail added as it becomes
|
|
* available. If you do not want this "chunky" display, you may pass
|
|
* NULL for display_row. If you do not want the sparkle display, and
|
|
* you have not called png_handle_alpha(), you may pass NULL for rows.
|
|
* If you have called png_handle_alpha(), and the image has either an
|
|
* alpha channel or a transparency chunk, you must provide a buffer for
|
|
* rows. In this case, you do not have to provide a display_row buffer
|
|
* 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 PNGAPI
|
|
png_read_rows(png_structp png_ptr, png_bytepp row,
|
|
png_bytepp display_row, png_uint_32 num_rows)
|
|
{
|
|
png_uint_32 i;
|
|
png_bytepp rp;
|
|
png_bytepp dp;
|
|
|
|
png_debug(1, "in png_read_rows");
|
|
if (png_ptr == NULL)
|
|
return;
|
|
rp = row;
|
|
dp = display_row;
|
|
if (rp != NULL && dp != NULL)
|
|
for (i = 0; i < num_rows; i++)
|
|
{
|
|
png_bytep rptr = *rp++;
|
|
png_bytep dptr = *dp++;
|
|
|
|
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, png_bytep_NULL);
|
|
rp++;
|
|
}
|
|
else if (dp != NULL)
|
|
for (i = 0; i < num_rows; i++)
|
|
{
|
|
png_bytep dptr = *dp;
|
|
png_read_row(png_ptr, png_bytep_NULL, dptr);
|
|
dp++;
|
|
}
|
|
}
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
|
|
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
/* Read the entire image. If the image has an alpha channel or a tRNS
|
|
* chunk, and you have called png_handle_alpha()[*], you will need to
|
|
* initialize the image to the current image that PNG will be overlaying.
|
|
* 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
|
|
* png_start_read_image() if png_set_interlace_handling() wasn't called
|
|
* 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 PNGAPI
|
|
png_read_image(png_structp png_ptr, png_bytepp image)
|
|
{
|
|
png_uint_32 i, image_height;
|
|
int pass, j;
|
|
png_bytepp rp;
|
|
|
|
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
|
|
|
|
|
|
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 < image_height; i++)
|
|
{
|
|
png_read_row(png_ptr, *rp, png_bytep_NULL);
|
|
rp++;
|
|
}
|
|
}
|
|
}
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
|
|
|
|
#ifndef PNG_NO_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 PNGAPI
|
|
png_read_end(png_structp png_ptr, png_infop info_ptr)
|
|
{
|
|
png_debug(1, "in png_read_end");
|
|
if (png_ptr == NULL)
|
|
return;
|
|
png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
|
|
|
|
do
|
|
{
|
|
#ifdef PNG_USE_LOCAL_ARRAYS
|
|
PNG_CONST PNG_IHDR;
|
|
PNG_CONST PNG_IDAT;
|
|
PNG_CONST PNG_IEND;
|
|
PNG_CONST PNG_PLTE;
|
|
#if defined(PNG_READ_bKGD_SUPPORTED)
|
|
PNG_CONST PNG_bKGD;
|
|
#endif
|
|
#if defined(PNG_READ_cHRM_SUPPORTED)
|
|
PNG_CONST PNG_cHRM;
|
|
#endif
|
|
#if defined(PNG_READ_gAMA_SUPPORTED)
|
|
PNG_CONST PNG_gAMA;
|
|
#endif
|
|
#if defined(PNG_READ_hIST_SUPPORTED)
|
|
PNG_CONST PNG_hIST;
|
|
#endif
|
|
#if defined(PNG_READ_iCCP_SUPPORTED)
|
|
PNG_CONST PNG_iCCP;
|
|
#endif
|
|
#if defined(PNG_READ_iTXt_SUPPORTED)
|
|
PNG_CONST PNG_iTXt;
|
|
#endif
|
|
#if defined(PNG_READ_oFFs_SUPPORTED)
|
|
PNG_CONST PNG_oFFs;
|
|
#endif
|
|
#if defined(PNG_READ_pCAL_SUPPORTED)
|
|
PNG_CONST PNG_pCAL;
|
|
#endif
|
|
#if defined(PNG_READ_pHYs_SUPPORTED)
|
|
PNG_CONST PNG_pHYs;
|
|
#endif
|
|
#if defined(PNG_READ_sBIT_SUPPORTED)
|
|
PNG_CONST PNG_sBIT;
|
|
#endif
|
|
#if defined(PNG_READ_sCAL_SUPPORTED)
|
|
PNG_CONST PNG_sCAL;
|
|
#endif
|
|
#if defined(PNG_READ_sPLT_SUPPORTED)
|
|
PNG_CONST PNG_sPLT;
|
|
#endif
|
|
#if defined(PNG_READ_sRGB_SUPPORTED)
|
|
PNG_CONST PNG_sRGB;
|
|
#endif
|
|
#if defined(PNG_READ_tEXt_SUPPORTED)
|
|
PNG_CONST PNG_tEXt;
|
|
#endif
|
|
#if defined(PNG_READ_tIME_SUPPORTED)
|
|
PNG_CONST PNG_tIME;
|
|
#endif
|
|
#if defined(PNG_READ_tRNS_SUPPORTED)
|
|
PNG_CONST PNG_tRNS;
|
|
#endif
|
|
#if defined(PNG_READ_zTXt_SUPPORTED)
|
|
PNG_CONST PNG_zTXt;
|
|
#endif
|
|
#endif /* PNG_USE_LOCAL_ARRAYS */
|
|
png_uint_32 length = png_read_chunk_header(png_ptr);
|
|
PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
|
|
|
|
if (!png_memcmp(chunk_name, png_IHDR, 4))
|
|
png_handle_IHDR(png_ptr, info_ptr, length);
|
|
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_error(png_ptr, "Too many IDAT's 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_HAVE_CHUNK_AFTER_IDAT))
|
|
png_error(png_ptr, "Too many IDAT's found");
|
|
png_crc_finish(png_ptr, length);
|
|
}
|
|
else if (!png_memcmp(chunk_name, png_PLTE, 4))
|
|
png_handle_PLTE(png_ptr, info_ptr, length);
|
|
#if defined(PNG_READ_bKGD_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_bKGD, 4))
|
|
png_handle_bKGD(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(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(chunk_name, png_gAMA, 4))
|
|
png_handle_gAMA(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(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(chunk_name, png_oFFs, 4))
|
|
png_handle_oFFs(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_pCAL_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_pCAL, 4))
|
|
png_handle_pCAL(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_sCAL_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_sCAL, 4))
|
|
png_handle_sCAL(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(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(chunk_name, png_sBIT, 4))
|
|
png_handle_sBIT(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_sRGB_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_sRGB, 4))
|
|
png_handle_sRGB(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_iCCP_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_iCCP, 4))
|
|
png_handle_iCCP(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_sPLT_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_sPLT, 4))
|
|
png_handle_sPLT(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_tEXt_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_tEXt, 4))
|
|
png_handle_tEXt(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(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(chunk_name, png_tRNS, 4))
|
|
png_handle_tRNS(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_zTXt_SUPPORTED)
|
|
else if (!png_memcmp(chunk_name, png_zTXt, 4))
|
|
png_handle_zTXt(png_ptr, info_ptr, length);
|
|
#endif
|
|
#if defined(PNG_READ_iTXt_SUPPORTED)
|
|
else if (!png_memcmp(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_NO_SEQUENTIAL_READ_SUPPORTED */
|
|
|
|
/* 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");
|
|
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;
|
|
|
|
if (end_info_ptr_ptr != NULL)
|
|
end_info_ptr = *end_info_ptr_ptr;
|
|
|
|
png_read_destroy(png_ptr, info_ptr, end_info_ptr);
|
|
|
|
if (info_ptr != NULL)
|
|
{
|
|
#if defined(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);
|
|
#endif
|
|
*info_ptr_ptr = NULL;
|
|
}
|
|
|
|
if (end_info_ptr != NULL)
|
|
{
|
|
#if defined(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);
|
|
#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);
|
|
#endif
|
|
*png_ptr_ptr = NULL;
|
|
}
|
|
}
|
|
|
|
/* 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");
|
|
if (info_ptr != NULL)
|
|
png_info_destroy(png_ptr, info_ptr);
|
|
|
|
if (end_info_ptr != NULL)
|
|
png_info_destroy(png_ptr, end_info_ptr);
|
|
|
|
png_free(png_ptr, png_ptr->zbuf);
|
|
png_free(png_ptr, png_ptr->big_row_buf);
|
|
png_free(png_ptr, png_ptr->prev_row);
|
|
png_free(png_ptr, png_ptr->chunkdata);
|
|
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
png_free(png_ptr, png_ptr->palette_lookup);
|
|
png_free(png_ptr, png_ptr->dither_index);
|
|
#endif
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
png_free(png_ptr, png_ptr->gamma_table);
|
|
#endif
|
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
png_free(png_ptr, png_ptr->gamma_from_1);
|
|
png_free(png_ptr, png_ptr->gamma_to_1);
|
|
#endif
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if (png_ptr->free_me & PNG_FREE_PLTE)
|
|
png_zfree(png_ptr, png_ptr->palette);
|
|
png_ptr->free_me &= ~PNG_FREE_PLTE;
|
|
#else
|
|
if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
|
|
png_zfree(png_ptr, png_ptr->palette);
|
|
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
|
|
#endif
|
|
#if defined(PNG_tRNS_SUPPORTED) || \
|
|
defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if (png_ptr->free_me & PNG_FREE_TRNS)
|
|
png_free(png_ptr, png_ptr->trans);
|
|
png_ptr->free_me &= ~PNG_FREE_TRNS;
|
|
#else
|
|
if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
|
|
png_free(png_ptr, png_ptr->trans);
|
|
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
|
|
#endif
|
|
#endif
|
|
#if defined(PNG_READ_hIST_SUPPORTED)
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if (png_ptr->free_me & PNG_FREE_HIST)
|
|
png_free(png_ptr, png_ptr->hist);
|
|
png_ptr->free_me &= ~PNG_FREE_HIST;
|
|
#else
|
|
if (png_ptr->flags & PNG_FLAG_FREE_HIST)
|
|
png_free(png_ptr, png_ptr->hist);
|
|
png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
|
|
#endif
|
|
#endif
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
if (png_ptr->gamma_16_table != NULL)
|
|
{
|
|
int 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]);
|
|
}
|
|
png_free(png_ptr, png_ptr->gamma_16_table);
|
|
}
|
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
if (png_ptr->gamma_16_from_1 != NULL)
|
|
{
|
|
int 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;
|
|
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
|
|
#if defined(PNG_TIME_RFC1123_SUPPORTED)
|
|
png_free(png_ptr, png_ptr->time_buffer);
|
|
#endif
|
|
|
|
inflateEnd(&png_ptr->zstream);
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
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.
|
|
*/
|
|
#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, 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
|
|
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
#if defined(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;
|
|
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
|
|
/* Invert the alpha channel from opacity to transparency
|
|
*/
|
|
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
|
|
png_set_invert_alpha(png_ptr);
|
|
#endif
|
|
|
|
/* png_read_info() gives us all of the information from the
|
|
* PNG file before the first IDAT (image data chunk).
|
|
*/
|
|
png_read_info(png_ptr, info_ptr);
|
|
if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
|
|
png_error(png_ptr, "Image is too high to process with png_read_png()");
|
|
|
|
/* -------------- image transformations start here ------------------- */
|
|
|
|
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
/* Tell libpng to strip 16 bit/color files down to 8 bits per color.
|
|
*/
|
|
if (transforms & PNG_TRANSFORM_STRIP_16)
|
|
png_set_strip_16(png_ptr);
|
|
#endif
|
|
|
|
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
/* Strip alpha bytes from the input data without combining with
|
|
* the background (not recommended).
|
|
*/
|
|
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
|
|
|
|
#if defined(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
|
|
|
|
#if defined(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 dithering.
|
|
*/
|
|
|
|
#if defined(PNG_READ_INVERT_SUPPORTED)
|
|
/* Invert monochrome files to have 0 as white and 1 as black
|
|
*/
|
|
if (transforms & PNG_TRANSFORM_INVERT_MONO)
|
|
png_set_invert_mono(png_ptr);
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SHIFT_SUPPORTED)
|
|
/* 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
|
|
|
|
#if defined(PNG_READ_BGR_SUPPORTED)
|
|
/* Flip the RGB pixels to BGR (or RGBA to BGRA)
|
|
*/
|
|
if (transforms & PNG_TRANSFORM_BGR)
|
|
png_set_bgr(png_ptr);
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
|
|
/* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
|
|
*/
|
|
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
|
|
png_set_swap_alpha(png_ptr);
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SWAP_SUPPORTED)
|
|
/* Swap bytes of 16 bit files to least significant byte first
|
|
*/
|
|
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
|
|
png_set_swap(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 ------------------- */
|
|
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
|
|
#endif
|
|
if (info_ptr->row_pointers == NULL)
|
|
{
|
|
info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
|
|
info_ptr->height * png_sizeof(png_bytep));
|
|
png_memset(info_ptr->row_pointers, 0, info_ptr->height
|
|
* png_sizeof(png_bytep));
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
info_ptr->free_me |= PNG_FREE_ROWS;
|
|
#endif
|
|
for (row = 0; row < (int)info_ptr->height; row++)
|
|
info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
|
|
png_get_rowbytes(png_ptr, info_ptr));
|
|
}
|
|
|
|
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_NO_SEQUENTIAL_READ_SUPPORTED */
|
|
#endif /* PNG_READ_SUPPORTED */
|