Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2 | /* pngread.c - read a PNG file |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3 | * |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 4 | * Last changed in libpng 1.2.11 June 7, 2006 |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 5 | * For conditions of distribution and use, see copyright notice in png.h |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 6 | * Copyright (c) 1998-2006 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 9 | * |
| 10 | * This file contains routines that an application calls directly to |
| 11 | * read a PNG file or stream. |
| 12 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 13 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 14 | #include "png.h" |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 15 | #include "pngpriv.h" |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 16 | |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 17 | #if defined(PNG_READ_SUPPORTED) |
| 18 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 19 | /* Create a PNG structure for reading, and allocate any memory needed. */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 20 | png_structp PNGAPI |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 21 | png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 22 | png_error_ptr error_fn, png_error_ptr warn_fn) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 23 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 24 | |
| 25 | #ifdef PNG_USER_MEM_SUPPORTED |
| 26 | return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 27 | warn_fn, NULL, NULL, NULL)); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 28 | } |
| 29 | |
| 30 | /* Alternate create PNG structure for reading, and allocate any memory needed. */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 31 | png_structp PNGAPI |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 32 | png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, |
| 33 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 34 | png_malloc_ptr malloc_fn, png_free_ptr free_fn) |
| 35 | { |
| 36 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 37 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 38 | png_structp png_ptr; |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 39 | |
| 40 | #ifdef PNG_SETJMP_SUPPORTED |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 41 | #ifdef USE_FAR_KEYWORD |
| 42 | jmp_buf jmpbuf; |
| 43 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 44 | #endif |
| 45 | |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 46 | int i; |
| 47 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 48 | png_debug(1, "in png_create_read_struct\n"); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 49 | #ifdef PNG_USER_MEM_SUPPORTED |
Glenn Randers-Pehrson | 9c0f094 | 2002-02-21 23:14:23 -0600 | [diff] [blame] | 50 | png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 51 | malloc_fn, mem_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 52 | #else |
Glenn Randers-Pehrson | 9c0f094 | 2002-02-21 23:14:23 -0600 | [diff] [blame] | 53 | png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 54 | #endif |
Glenn Randers-Pehrson | 9c0f094 | 2002-02-21 23:14:23 -0600 | [diff] [blame] | 55 | if (png_ptr == NULL) |
Glenn Randers-Pehrson | 3f54925 | 2001-10-27 07:35:13 -0500 | [diff] [blame] | 56 | return (NULL); |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 57 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 58 | #ifdef PNG_MMX_CODE_SUPPORTED |
Glenn Randers-Pehrson | 1fd5fb3 | 2001-05-06 05:34:26 -0500 | [diff] [blame] | 59 | png_init_mmx_flags(png_ptr); /* 1.2.0 addition */ |
| 60 | #endif |
| 61 | |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 62 | /* added at libpng-1.2.6 */ |
| 63 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
| 64 | png_ptr->user_width_max=PNG_USER_WIDTH_MAX; |
| 65 | png_ptr->user_height_max=PNG_USER_HEIGHT_MAX; |
| 66 | #endif |
| 67 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 68 | #ifdef PNG_SETJMP_SUPPORTED |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 69 | #ifdef USE_FAR_KEYWORD |
| 70 | if (setjmp(jmpbuf)) |
| 71 | #else |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 72 | if (setjmp(png_ptr->jmpbuf)) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 73 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 74 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 75 | png_free(png_ptr, png_ptr->zbuf); |
Glenn Randers-Pehrson | 4766a24 | 2000-07-17 06:17:09 -0500 | [diff] [blame] | 76 | png_ptr->zbuf=NULL; |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame] | 77 | #ifdef PNG_USER_MEM_SUPPORTED |
Glenn Randers-Pehrson | e647462 | 2006-03-04 16:50:47 -0600 | [diff] [blame] | 78 | png_destroy_struct_2((png_voidp)png_ptr, |
Glenn Randers-Pehrson | d1e8c86 | 2002-06-20 06:54:34 -0500 | [diff] [blame] | 79 | (png_free_ptr)free_fn, (png_voidp)mem_ptr); |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame] | 80 | #else |
| 81 | png_destroy_struct((png_voidp)png_ptr); |
| 82 | #endif |
Glenn Randers-Pehrson | 3f54925 | 2001-10-27 07:35:13 -0500 | [diff] [blame] | 83 | return (NULL); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 84 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 85 | #ifdef USE_FAR_KEYWORD |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 86 | png_memcpy(png_ptr->jmpbuf, jmpbuf, sizeof(jmp_buf)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 87 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 88 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 89 | |
| 90 | #ifdef PNG_USER_MEM_SUPPORTED |
| 91 | png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 92 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 93 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 94 | png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 95 | |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 96 | i=0; |
| 97 | do |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 98 | { |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 99 | if(user_png_ver[i] != png_libpng_ver[i]) |
| 100 | png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
| 101 | } while (png_libpng_ver[i++]); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 102 | |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 103 | if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) |
Glenn Randers-Pehrson | 98c9d73 | 2000-05-03 21:06:11 -0500 | [diff] [blame] | 104 | { |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 105 | /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so |
| 106 | * we must recompile any applications that use any older library version. |
| 107 | * For versions after libpng 1.0, we will be compatible, so we need |
| 108 | * only check the first digit. |
| 109 | */ |
| 110 | if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 111 | (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 112 | (user_png_ver[0] == '0' && user_png_ver[2] < '9')) |
| 113 | { |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 114 | #ifndef PNG_NO_STDIO |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 115 | char msg[80]; |
| 116 | if (user_png_ver) |
| 117 | { |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 118 | png_sprintf(msg, "Application was compiled with png.h from libpng-%.20s", |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 119 | user_png_ver); |
| 120 | png_warning(png_ptr, msg); |
| 121 | } |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 122 | png_sprintf(msg, "Application is running with png.c from libpng-%.20s", |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 123 | png_libpng_ver); |
| 124 | png_warning(png_ptr, msg); |
| 125 | #endif |
| 126 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 127 | png_ptr->flags=0; |
| 128 | #endif |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 129 | png_error(png_ptr, |
| 130 | "Incompatible libpng version in application and library"); |
| 131 | } |
Glenn Randers-Pehrson | 98c9d73 | 2000-05-03 21:06:11 -0500 | [diff] [blame] | 132 | } |
| 133 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 134 | /* initialize zbuf - compression buffer */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 135 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 136 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 137 | png_ptr->zstream.zalloc = png_zalloc; |
| 138 | png_ptr->zstream.zfree = png_zfree; |
| 139 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 140 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 141 | switch (inflateInit(&png_ptr->zstream)) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 142 | { |
| 143 | case Z_OK: /* Do nothing */ break; |
| 144 | case Z_MEM_ERROR: |
| 145 | case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break; |
| 146 | case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break; |
| 147 | default: png_error(png_ptr, "Unknown zlib error"); |
| 148 | } |
| 149 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 150 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 151 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 152 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 153 | png_set_read_fn(png_ptr, NULL, NULL); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 154 | |
Glenn Randers-Pehrson | 03008a0 | 2002-04-27 10:11:25 -0500 | [diff] [blame] | 155 | #ifdef PNG_SETJMP_SUPPORTED |
| 156 | /* Applications that neglect to set up their own setjmp() and then encounter |
| 157 | a png_error() will longjmp here. Since the jmpbuf is then meaningless we |
| 158 | abort instead of returning. */ |
| 159 | #ifdef USE_FAR_KEYWORD |
| 160 | if (setjmp(jmpbuf)) |
| 161 | PNG_ABORT(); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 162 | png_memcpy(png_ptr->jmpbuf, jmpbuf, sizeof(jmp_buf)); |
Glenn Randers-Pehrson | 03008a0 | 2002-04-27 10:11:25 -0500 | [diff] [blame] | 163 | #else |
| 164 | if (setjmp(png_ptr->jmpbuf)) |
| 165 | PNG_ABORT(); |
| 166 | #endif |
| 167 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 168 | return (png_ptr); |
| 169 | } |
| 170 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 171 | |
| 172 | void PNGAPI |
| 173 | png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, |
| 174 | png_size_t png_struct_size) |
| 175 | { |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 176 | #ifdef PNG_SETJMP_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 177 | jmp_buf tmp_jmp; /* to save current jump buffer */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 178 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 179 | |
Glenn Randers-Pehrson | 98c9d73 | 2000-05-03 21:06:11 -0500 | [diff] [blame] | 180 | int i=0; |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 181 | |
| 182 | png_structp png_ptr=*ptr_ptr; |
| 183 | |
Glenn Randers-Pehrson | 98c9d73 | 2000-05-03 21:06:11 -0500 | [diff] [blame] | 184 | do |
| 185 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 186 | if (user_png_ver[i] != png_libpng_ver[i]) |
Glenn Randers-Pehrson | 98c9d73 | 2000-05-03 21:06:11 -0500 | [diff] [blame] | 187 | { |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 188 | #ifdef PNG_LEGACY_SUPPORTED |
| 189 | png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
| 190 | #else |
Glenn Randers-Pehrson | 3f54925 | 2001-10-27 07:35:13 -0500 | [diff] [blame] | 191 | png_ptr->warning_fn=NULL; |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 192 | png_warning(png_ptr, |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 193 | "Application uses deprecated png_read_init() and should be recompiled"); |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 194 | break; |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 195 | #endif |
Glenn Randers-Pehrson | 98c9d73 | 2000-05-03 21:06:11 -0500 | [diff] [blame] | 196 | } |
| 197 | } while (png_libpng_ver[i++]); |
Glenn Randers-Pehrson | 98c9d73 | 2000-05-03 21:06:11 -0500 | [diff] [blame] | 198 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 199 | png_debug(1, "in png_read_init_3\n"); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 200 | |
| 201 | #ifdef PNG_SETJMP_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 202 | /* save jump buffer and error functions */ |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 203 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof(jmp_buf)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 204 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 205 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 206 | if (sizeof(png_struct) > png_struct_size) |
| 207 | { |
| 208 | png_destroy_struct(png_ptr); |
| 209 | *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
| 210 | png_ptr = *ptr_ptr; |
| 211 | } |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 212 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 213 | /* reset all variables to 0 */ |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 214 | png_memset(png_ptr, 0, sizeof(png_struct)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 215 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 216 | #ifdef PNG_SETJMP_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 217 | /* restore jump buffer */ |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 218 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof(jmp_buf)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 219 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 220 | |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 221 | /* added at libpng-1.2.6 */ |
| 222 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
| 223 | png_ptr->user_width_max=PNG_USER_WIDTH_MAX; |
| 224 | png_ptr->user_height_max=PNG_USER_HEIGHT_MAX; |
| 225 | #endif |
| 226 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 227 | /* initialize zbuf - compression buffer */ |
| 228 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 229 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 230 | png_ptr->zstream.zalloc = png_zalloc; |
| 231 | png_ptr->zstream.zfree = png_zfree; |
| 232 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 233 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 234 | switch (inflateInit(&png_ptr->zstream)) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 235 | { |
| 236 | case Z_OK: /* Do nothing */ break; |
| 237 | case Z_MEM_ERROR: |
| 238 | case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break; |
| 239 | case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break; |
| 240 | default: png_error(png_ptr, "Unknown zlib error"); |
| 241 | } |
| 242 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 243 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 244 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 245 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 246 | png_set_read_fn(png_ptr, NULL, NULL); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 247 | } |
| 248 | |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 249 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 250 | /* Read the information before the actual image data. This has been |
Glenn Randers-Pehrson | f9f2fe0 | 1998-03-15 18:20:23 -0600 | [diff] [blame] | 251 | * changed in v0.90 to allow reading a file that already has the magic |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 252 | * bytes read from the stream. You can tell libpng how many bytes have |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 253 | * been read from the beginning of the stream (up to the maximum of 8) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 254 | * via png_set_sig_bytes(), and we will only check the remaining bytes |
| 255 | * here. The application can then have access to the signature bytes we |
| 256 | * read if it is determined that this isn't a valid PNG file. |
| 257 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 258 | void PNGAPI |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 259 | png_read_info(png_structp png_ptr, png_infop info_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 260 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 261 | png_debug(1, "in png_read_info\n"); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 262 | /* If we haven't checked all of the PNG signature bytes, do so now. */ |
| 263 | if (png_ptr->sig_bytes < 8) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 264 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 265 | png_size_t num_checked = png_ptr->sig_bytes, |
| 266 | num_to_check = 8 - num_checked; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 267 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 268 | #ifdef PNG_IO_STATE_SUPPORTED |
| 269 | png_ptr->io_state = PNG_IO_READING | PNG_IO_SIGNATURE; |
| 270 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 271 | png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 272 | png_ptr->sig_bytes = 8; |
| 273 | |
| 274 | if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
| 275 | { |
| 276 | if (num_checked < 4 && |
| 277 | png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
| 278 | png_error(png_ptr, "Not a PNG file"); |
| 279 | else |
| 280 | png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
| 281 | } |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 282 | if (num_checked < 3) |
| 283 | png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 284 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 285 | |
Glenn Randers-Pehrson | ea3bcd7 | 1998-03-07 14:33:00 -0600 | [diff] [blame] | 286 | for(;;) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 287 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 288 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 289 | PNG_IHDR; |
| 290 | PNG_IDAT; |
| 291 | PNG_IEND; |
| 292 | PNG_PLTE; |
| 293 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 294 | PNG_bKGD; |
| 295 | #endif |
| 296 | #if defined(PNG_READ_cHRM_SUPPORTED) |
| 297 | PNG_cHRM; |
| 298 | #endif |
| 299 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 300 | PNG_gAMA; |
| 301 | #endif |
| 302 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 303 | PNG_hIST; |
| 304 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 305 | #if defined(PNG_READ_iCCP_SUPPORTED) |
| 306 | PNG_iCCP; |
| 307 | #endif |
| 308 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 309 | PNG_iTXt; |
| 310 | #endif |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 311 | #if defined(PNG_READ_oFFs_SUPPORTED) |
| 312 | PNG_oFFs; |
| 313 | #endif |
| 314 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 315 | PNG_pCAL; |
| 316 | #endif |
| 317 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 318 | PNG_pHYs; |
| 319 | #endif |
| 320 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 321 | PNG_sBIT; |
| 322 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 323 | #if defined(PNG_READ_sCAL_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 324 | PNG_sCAL; |
| 325 | #endif |
| 326 | #if defined(PNG_READ_sPLT_SUPPORTED) |
| 327 | PNG_sPLT; |
| 328 | #endif |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 329 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 330 | PNG_sRGB; |
| 331 | #endif |
| 332 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 333 | PNG_tEXt; |
| 334 | #endif |
| 335 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 336 | PNG_tIME; |
| 337 | #endif |
| 338 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 339 | PNG_tRNS; |
| 340 | #endif |
| 341 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 342 | PNG_zTXt; |
| 343 | #endif |
Glenn Randers-Pehrson | 16e1166 | 2004-11-01 14:13:40 -0600 | [diff] [blame] | 344 | #endif /* PNG_USE_LOCAL_ARRAYS */ |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 345 | png_uint_32 length = png_read_chunk_header(png_ptr); |
| 346 | png_bytep chunk_name = png_ptr->chunk_name; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 347 | |
| 348 | /* This should be a binary subdivision search or a hash for |
| 349 | * matching the chunk name rather than a linear search. |
| 350 | */ |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 351 | if (!png_memcmp(chunk_name, png_IDAT, 4)) |
| 352 | if (png_ptr->mode & PNG_AFTER_IDAT) |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 353 | png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; |
| 354 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 355 | if (!png_memcmp(chunk_name, png_IHDR, 4)) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 356 | png_handle_IHDR(png_ptr, info_ptr, length); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 357 | else if (!png_memcmp(chunk_name, png_IEND, 4)) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 358 | png_handle_IEND(png_ptr, info_ptr, length); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 359 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 360 | else if (png_handle_as_unknown(png_ptr, chunk_name)) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 361 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 362 | if (!png_memcmp(chunk_name, png_IDAT, 4)) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 363 | png_ptr->mode |= PNG_HAVE_IDAT; |
| 364 | png_handle_unknown(png_ptr, info_ptr, length); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 365 | if (!png_memcmp(chunk_name, png_PLTE, 4)) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 366 | png_ptr->mode |= PNG_HAVE_PLTE; |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 367 | else if (!png_memcmp(chunk_name, png_IDAT, 4)) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 368 | { |
| 369 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 370 | png_error(png_ptr, "Missing IHDR before IDAT"); |
| 371 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 372 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 373 | png_error(png_ptr, "Missing PLTE before IDAT"); |
| 374 | break; |
| 375 | } |
| 376 | } |
| 377 | #endif |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 378 | else if (!png_memcmp(chunk_name, png_PLTE, 4)) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 379 | png_handle_PLTE(png_ptr, info_ptr, length); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 380 | else if (!png_memcmp(chunk_name, png_IDAT, 4)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 381 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 382 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 383 | png_error(png_ptr, "Missing IHDR before IDAT"); |
| 384 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 385 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 386 | png_error(png_ptr, "Missing PLTE before IDAT"); |
| 387 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 388 | png_ptr->idat_size = length; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 389 | png_ptr->mode |= PNG_HAVE_IDAT; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 390 | break; |
| 391 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 392 | #if defined(PNG_READ_bKGD_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 393 | else if (!png_memcmp(chunk_name, png_bKGD, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 394 | png_handle_bKGD(png_ptr, info_ptr, length); |
| 395 | #endif |
| 396 | #if defined(PNG_READ_cHRM_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 397 | else if (!png_memcmp(chunk_name, png_cHRM, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 398 | png_handle_cHRM(png_ptr, info_ptr, length); |
| 399 | #endif |
| 400 | #if defined(PNG_READ_gAMA_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 401 | else if (!png_memcmp(chunk_name, png_gAMA, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 402 | png_handle_gAMA(png_ptr, info_ptr, length); |
| 403 | #endif |
| 404 | #if defined(PNG_READ_hIST_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 405 | else if (!png_memcmp(chunk_name, png_hIST, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 406 | png_handle_hIST(png_ptr, info_ptr, length); |
| 407 | #endif |
| 408 | #if defined(PNG_READ_oFFs_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 409 | else if (!png_memcmp(chunk_name, png_oFFs, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 410 | png_handle_oFFs(png_ptr, info_ptr, length); |
| 411 | #endif |
| 412 | #if defined(PNG_READ_pCAL_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 413 | else if (!png_memcmp(chunk_name, png_pCAL, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 414 | png_handle_pCAL(png_ptr, info_ptr, length); |
| 415 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 416 | #if defined(PNG_READ_sCAL_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 417 | else if (!png_memcmp(chunk_name, png_sCAL, 4)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 418 | png_handle_sCAL(png_ptr, info_ptr, length); |
| 419 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 420 | #if defined(PNG_READ_pHYs_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 421 | else if (!png_memcmp(chunk_name, png_pHYs, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 422 | png_handle_pHYs(png_ptr, info_ptr, length); |
| 423 | #endif |
| 424 | #if defined(PNG_READ_sBIT_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 425 | else if (!png_memcmp(chunk_name, png_sBIT, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 426 | png_handle_sBIT(png_ptr, info_ptr, length); |
| 427 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 428 | #if defined(PNG_READ_sRGB_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 429 | else if (!png_memcmp(chunk_name, png_sRGB, 4)) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 430 | png_handle_sRGB(png_ptr, info_ptr, length); |
| 431 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 432 | #if defined(PNG_READ_iCCP_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 433 | else if (!png_memcmp(chunk_name, png_iCCP, 4)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 434 | png_handle_iCCP(png_ptr, info_ptr, length); |
| 435 | #endif |
| 436 | #if defined(PNG_READ_sPLT_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 437 | else if (!png_memcmp(chunk_name, png_sPLT, 4)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 438 | png_handle_sPLT(png_ptr, info_ptr, length); |
| 439 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 440 | #if defined(PNG_READ_tEXt_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 441 | else if (!png_memcmp(chunk_name, png_tEXt, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 442 | png_handle_tEXt(png_ptr, info_ptr, length); |
| 443 | #endif |
| 444 | #if defined(PNG_READ_tIME_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 445 | else if (!png_memcmp(chunk_name, png_tIME, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 446 | png_handle_tIME(png_ptr, info_ptr, length); |
| 447 | #endif |
| 448 | #if defined(PNG_READ_tRNS_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 449 | else if (!png_memcmp(chunk_name, png_tRNS, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 450 | png_handle_tRNS(png_ptr, info_ptr, length); |
| 451 | #endif |
| 452 | #if defined(PNG_READ_zTXt_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 453 | else if (!png_memcmp(chunk_name, png_zTXt, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 454 | png_handle_zTXt(png_ptr, info_ptr, length); |
| 455 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 456 | #if defined(PNG_READ_iTXt_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 457 | else if (!png_memcmp(chunk_name, png_iTXt, 4)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 458 | png_handle_iTXt(png_ptr, info_ptr, length); |
| 459 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 460 | else |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 461 | png_handle_unknown(png_ptr, info_ptr, length); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 462 | } |
| 463 | } |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 464 | #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 465 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 466 | /* optional call to update the users info_ptr structure */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 467 | void PNGAPI |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 468 | png_read_update_info(png_structp png_ptr, png_infop info_ptr) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 469 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 470 | png_debug(1, "in png_read_update_info\n"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 471 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 472 | png_read_start_row(png_ptr); |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 473 | else |
| 474 | png_warning(png_ptr, |
| 475 | "Ignoring extra png_read_update_info() call; row buffer not reallocated"); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 476 | png_read_transform_info(png_ptr, info_ptr); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 477 | } |
| 478 | |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 479 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 480 | /* Initialize palette, background, etc, after transformations |
| 481 | * are set, but before any reading takes place. This allows |
Glenn Randers-Pehrson | 345bc27 | 1998-06-14 14:43:31 -0500 | [diff] [blame] | 482 | * the user to obtain a gamma-corrected palette, for example. |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 483 | * If the user doesn't call this, we will do it ourselves. |
| 484 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 485 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 486 | png_start_read_image(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 487 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 488 | png_debug(1, "in png_start_read_image\n"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 489 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 490 | png_read_start_row(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 491 | } |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 492 | #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 493 | |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 494 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 495 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 496 | png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 497 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 498 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 499 | PNG_IDAT; |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 500 | const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
| 501 | const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 502 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 503 | int ret; |
Glenn Randers-Pehrson | 4766a24 | 2000-07-17 06:17:09 -0500 | [diff] [blame] | 504 | png_debug2(1, "in png_read_row (row %lu, pass %d)\n", |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 505 | (unsigned long) png_ptr->row_number, png_ptr->pass); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 506 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 507 | png_read_start_row(png_ptr); |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 508 | if (png_ptr->row_number == 0 && png_ptr->pass == 0) |
| 509 | { |
| 510 | /* check for transforms that have been set but were defined out */ |
| 511 | #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED) |
| 512 | if (png_ptr->transformations & PNG_INVERT_MONO) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 513 | png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined"); |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 514 | #endif |
| 515 | #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED) |
| 516 | if (png_ptr->transformations & PNG_FILLER) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 517 | png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined"); |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 518 | #endif |
| 519 | #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 520 | if (png_ptr->transformations & PNG_PACKSWAP) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 521 | png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined"); |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 522 | #endif |
| 523 | #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED) |
| 524 | if (png_ptr->transformations & PNG_PACK) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 525 | png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined"); |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 526 | #endif |
| 527 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) |
| 528 | if (png_ptr->transformations & PNG_SHIFT) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 529 | png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined"); |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 530 | #endif |
| 531 | #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED) |
| 532 | if (png_ptr->transformations & PNG_BGR) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 533 | png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined"); |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 534 | #endif |
| 535 | #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED) |
| 536 | if (png_ptr->transformations & PNG_SWAP_BYTES) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 537 | png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined"); |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 538 | #endif |
| 539 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 540 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 541 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 542 | /* if interlaced and we do not need a new row, combine row and return */ |
| 543 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| 544 | { |
| 545 | switch (png_ptr->pass) |
| 546 | { |
| 547 | case 0: |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 548 | if (png_ptr->row_number & 0x07) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 549 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 550 | if (dsp_row != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 551 | png_combine_row(png_ptr, dsp_row, |
| 552 | png_pass_dsp_mask[png_ptr->pass]); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 553 | png_read_finish_row(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 554 | return; |
| 555 | } |
| 556 | break; |
| 557 | case 1: |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 558 | if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 559 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 560 | if (dsp_row != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 561 | png_combine_row(png_ptr, dsp_row, |
| 562 | png_pass_dsp_mask[png_ptr->pass]); |
| 563 | png_read_finish_row(png_ptr); |
| 564 | return; |
| 565 | } |
| 566 | break; |
| 567 | case 2: |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 568 | if ((png_ptr->row_number & 0x07) != 4) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 569 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 570 | if (dsp_row != NULL && (png_ptr->row_number & 4)) |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 571 | png_combine_row(png_ptr, dsp_row, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 572 | png_pass_dsp_mask[png_ptr->pass]); |
| 573 | png_read_finish_row(png_ptr); |
| 574 | return; |
| 575 | } |
| 576 | break; |
| 577 | case 3: |
| 578 | if ((png_ptr->row_number & 3) || png_ptr->width < 3) |
| 579 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 580 | if (dsp_row != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 581 | png_combine_row(png_ptr, dsp_row, |
| 582 | png_pass_dsp_mask[png_ptr->pass]); |
| 583 | png_read_finish_row(png_ptr); |
| 584 | return; |
| 585 | } |
| 586 | break; |
| 587 | case 4: |
| 588 | if ((png_ptr->row_number & 3) != 2) |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 589 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 590 | if (dsp_row != NULL && (png_ptr->row_number & 2)) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 591 | png_combine_row(png_ptr, dsp_row, |
| 592 | png_pass_dsp_mask[png_ptr->pass]); |
| 593 | png_read_finish_row(png_ptr); |
| 594 | return; |
| 595 | } |
| 596 | break; |
| 597 | case 5: |
| 598 | if ((png_ptr->row_number & 1) || png_ptr->width < 2) |
| 599 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 600 | if (dsp_row != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 601 | png_combine_row(png_ptr, dsp_row, |
| 602 | png_pass_dsp_mask[png_ptr->pass]); |
| 603 | png_read_finish_row(png_ptr); |
| 604 | return; |
| 605 | } |
| 606 | break; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 607 | case 6: |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 608 | if (!(png_ptr->row_number & 1)) |
| 609 | { |
| 610 | png_read_finish_row(png_ptr); |
| 611 | return; |
| 612 | } |
| 613 | break; |
| 614 | } |
| 615 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 616 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 617 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 618 | if (!(png_ptr->mode & PNG_HAVE_IDAT)) |
| 619 | png_error(png_ptr, "Invalid attempt to read row data"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 620 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 621 | png_ptr->zstream.next_out = png_ptr->row_buf; |
| 622 | png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 623 | do |
| 624 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 625 | if (!(png_ptr->zstream.avail_in)) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 626 | { |
| 627 | while (!png_ptr->idat_size) |
| 628 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 629 | png_crc_finish(png_ptr, 0); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 630 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 631 | png_ptr->idat_size = png_read_chunk_header(png_ptr); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 632 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 633 | png_error(png_ptr, "Not enough image data"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 634 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 635 | png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; |
| 636 | png_ptr->zstream.next_in = png_ptr->zbuf; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 637 | if (png_ptr->zbuf_size > png_ptr->idat_size) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 638 | png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 639 | png_crc_read(png_ptr, png_ptr->zbuf, |
| 640 | (png_size_t)png_ptr->zstream.avail_in); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 641 | png_ptr->idat_size -= png_ptr->zstream.avail_in; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 642 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 643 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 644 | if (ret == Z_STREAM_END) |
| 645 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 646 | if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 647 | png_ptr->idat_size) |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 648 | png_benign_error(png_ptr, "Extra compressed data"); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 649 | png_ptr->mode |= PNG_AFTER_IDAT; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 650 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 651 | break; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 652 | } |
| 653 | if (ret != Z_OK) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 654 | png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 655 | "Decompression error"); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 656 | |
| 657 | } while (png_ptr->zstream.avail_out); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 658 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 659 | png_ptr->row_info.color_type = png_ptr->color_type; |
| 660 | png_ptr->row_info.width = png_ptr->iwidth; |
| 661 | png_ptr->row_info.channels = png_ptr->channels; |
| 662 | png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
| 663 | png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 664 | png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, |
| 665 | png_ptr->row_info.width); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 666 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 667 | if(png_ptr->row_buf[0]) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 668 | png_read_filter_row(png_ptr, &(png_ptr->row_info), |
| 669 | png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
| 670 | (int)(png_ptr->row_buf[0])); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 671 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 672 | png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); |
Glenn Randers-Pehrson | e647462 | 2006-03-04 16:50:47 -0600 | [diff] [blame] | 673 | |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 674 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
| 675 | if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
| 676 | (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) |
| 677 | { |
| 678 | /* Intrapixel differencing */ |
| 679 | png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); |
| 680 | } |
| 681 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 682 | |
Glenn Randers-Pehrson | 73b029f | 2004-11-26 17:28:09 -0600 | [diff] [blame] | 683 | if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 684 | png_do_read_transformations(png_ptr); |
| 685 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 686 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 687 | /* blow up interlaced rows to full size */ |
| 688 | if (png_ptr->interlaced && |
| 689 | (png_ptr->transformations & PNG_INTERLACE)) |
| 690 | { |
| 691 | if (png_ptr->pass < 6) |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 692 | /* old interface (pre-1.0.9): |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 693 | png_do_read_interlace(&(png_ptr->row_info), |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 694 | png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 695 | */ |
| 696 | png_do_read_interlace(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 697 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 698 | if (dsp_row != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 699 | png_combine_row(png_ptr, dsp_row, |
| 700 | png_pass_dsp_mask[png_ptr->pass]); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 701 | if (row != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 702 | png_combine_row(png_ptr, row, |
| 703 | png_pass_mask[png_ptr->pass]); |
| 704 | } |
| 705 | else |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 706 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 707 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 708 | if (row != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 709 | png_combine_row(png_ptr, row, 0xff); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 710 | if (dsp_row != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 711 | png_combine_row(png_ptr, dsp_row, 0xff); |
| 712 | } |
| 713 | png_read_finish_row(png_ptr); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 714 | |
| 715 | if (png_ptr->read_row_fn != NULL) |
| 716 | (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 717 | } |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 718 | #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 719 | |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 720 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 721 | /* Read one or more rows of image data. If the image is interlaced, |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 722 | * and png_set_interlace_handling() has been called, the rows need to |
| 723 | * contain the contents of the rows from the previous pass. If the |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 724 | * image has alpha or transparency, and png_handle_alpha()[*] has been |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 725 | * called, the rows contents must be initialized to the contents of the |
| 726 | * screen. |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 727 | * |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 728 | * "row" holds the actual image, and pixels are placed in it |
| 729 | * as they arrive. If the image is displayed after each pass, it will |
| 730 | * appear to "sparkle" in. "display_row" can be used to display a |
| 731 | * "chunky" progressive image, with finer detail added as it becomes |
| 732 | * available. If you do not want this "chunky" display, you may pass |
| 733 | * NULL for display_row. If you do not want the sparkle display, and |
| 734 | * you have not called png_handle_alpha(), you may pass NULL for rows. |
| 735 | * If you have called png_handle_alpha(), and the image has either an |
| 736 | * alpha channel or a transparency chunk, you must provide a buffer for |
| 737 | * rows. In this case, you do not have to provide a display_row buffer |
| 738 | * also, but you may. If the image is not interlaced, or if you have |
| 739 | * not called png_set_interlace_handling(), the display_row buffer will |
| 740 | * be ignored, so pass NULL to it. |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 741 | * |
Glenn Randers-Pehrson | c3d51c1 | 2006-03-02 07:23:18 -0600 | [diff] [blame] | 742 | * [*] png_handle_alpha() does not exist yet, as of this version of libpng |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 743 | */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 744 | |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 745 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 746 | png_read_rows(png_structp png_ptr, png_bytepp row, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 747 | png_bytepp display_row, png_uint_32 num_rows) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 748 | { |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 749 | png_uint_32 i; |
| 750 | png_bytepp rp; |
| 751 | png_bytepp dp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 752 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 753 | png_debug(1, "in png_read_rows\n"); |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 754 | rp = row; |
| 755 | dp = display_row; |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 756 | if (rp != NULL && dp != NULL) |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 757 | for (i = 0; i < num_rows; i++) |
| 758 | { |
| 759 | png_bytep rptr = *rp++; |
| 760 | png_bytep dptr = *dp++; |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 761 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 762 | png_read_row(png_ptr, rptr, dptr); |
| 763 | } |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 764 | else if(rp != NULL) |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 765 | for (i = 0; i < num_rows; i++) |
| 766 | { |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 767 | png_bytep rptr = *rp; |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 768 | png_read_row(png_ptr, rptr, NULL); |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 769 | rp++; |
| 770 | } |
| 771 | else if(dp != NULL) |
| 772 | for (i = 0; i < num_rows; i++) |
| 773 | { |
| 774 | png_bytep dptr = *dp; |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 775 | png_read_row(png_ptr, NULL, dptr); |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 776 | dp++; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 777 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 778 | } |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 779 | #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 780 | |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 781 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 782 | /* Read the entire image. If the image has an alpha channel or a tRNS |
Glenn Randers-Pehrson | 345bc27 | 1998-06-14 14:43:31 -0500 | [diff] [blame] | 783 | * chunk, and you have called png_handle_alpha()[*], you will need to |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 784 | * initialize the image to the current image that PNG will be overlaying. |
| 785 | * We set the num_rows again here, in case it was incorrectly set in |
| 786 | * png_read_start_row() by a call to png_read_update_info() or |
| 787 | * png_start_read_image() if png_set_interlace_handling() wasn't called |
| 788 | * prior to either of these functions like it should have been. You can |
| 789 | * only call this function once. If you desire to have an image for |
| 790 | * each pass of a interlaced image, use png_read_rows() instead. |
Glenn Randers-Pehrson | 345bc27 | 1998-06-14 14:43:31 -0500 | [diff] [blame] | 791 | * |
Glenn Randers-Pehrson | c3d51c1 | 2006-03-02 07:23:18 -0600 | [diff] [blame] | 792 | * [*] png_handle_alpha() does not exist yet, as of this version of libpng |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 793 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 794 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 795 | png_read_image(png_structp png_ptr, png_bytepp image) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 796 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 797 | png_uint_32 i,image_height; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 798 | int pass, j; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 799 | png_bytepp rp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 800 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 801 | png_debug(1, "in png_read_image\n"); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 802 | |
| 803 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 804 | pass = png_set_interlace_handling(png_ptr); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 805 | #else |
| 806 | if (png_ptr->interlaced) |
| 807 | png_error(png_ptr, |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 808 | "Cannot read interlaced image -- interlace handler disabled"); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 809 | pass = 1; |
| 810 | #endif |
| 811 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 812 | image_height=png_ptr->height; |
| 813 | png_ptr->num_rows = image_height; /* Make sure this is set correctly */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 814 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 815 | for (j = 0; j < pass; j++) |
| 816 | { |
| 817 | rp = image; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 818 | for (i = 0; i < image_height; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 819 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 820 | png_read_row(png_ptr, *rp, NULL); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 821 | rp++; |
| 822 | } |
| 823 | } |
| 824 | } |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 825 | #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 826 | |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 827 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 828 | /* Read the end of the PNG file. Will not read past the end of the |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 829 | * file, will verify the end is accurate, and will read any comments |
| 830 | * or time information at the end of the file, if info is not NULL. |
| 831 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 832 | void PNGAPI |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 833 | png_read_end(png_structp png_ptr, png_infop info_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 834 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 835 | png_bytep chunk_name; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 836 | png_uint_32 length; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 837 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 838 | png_debug(1, "in png_read_end\n"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 839 | png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 840 | |
| 841 | do |
| 842 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 843 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 844 | PNG_IHDR; |
| 845 | PNG_IDAT; |
| 846 | PNG_IEND; |
| 847 | PNG_PLTE; |
| 848 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 849 | PNG_bKGD; |
| 850 | #endif |
| 851 | #if defined(PNG_READ_cHRM_SUPPORTED) |
| 852 | PNG_cHRM; |
| 853 | #endif |
| 854 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 855 | PNG_gAMA; |
| 856 | #endif |
| 857 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 858 | PNG_hIST; |
| 859 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 860 | #if defined(PNG_READ_iCCP_SUPPORTED) |
| 861 | PNG_iCCP; |
| 862 | #endif |
| 863 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 864 | PNG_iTXt; |
| 865 | #endif |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 866 | #if defined(PNG_READ_oFFs_SUPPORTED) |
| 867 | PNG_oFFs; |
| 868 | #endif |
| 869 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 870 | PNG_pCAL; |
| 871 | #endif |
| 872 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 873 | PNG_pHYs; |
| 874 | #endif |
| 875 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 876 | PNG_sBIT; |
| 877 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 878 | #if defined(PNG_READ_sCAL_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 879 | PNG_sCAL; |
| 880 | #endif |
| 881 | #if defined(PNG_READ_sPLT_SUPPORTED) |
| 882 | PNG_sPLT; |
| 883 | #endif |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 884 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 885 | PNG_sRGB; |
| 886 | #endif |
| 887 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 888 | PNG_tEXt; |
| 889 | #endif |
| 890 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 891 | PNG_tIME; |
| 892 | #endif |
| 893 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 894 | PNG_tRNS; |
| 895 | #endif |
| 896 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 897 | PNG_zTXt; |
| 898 | #endif |
Glenn Randers-Pehrson | 16e1166 | 2004-11-01 14:13:40 -0600 | [diff] [blame] | 899 | #endif /* PNG_USE_LOCAL_ARRAYS */ |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 900 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 901 | length = png_read_chunk_header(png_ptr); |
| 902 | chunk_name = png_ptr->chunk_name; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 903 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 904 | if (!png_memcmp(chunk_name, png_IHDR, 4)) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 905 | png_handle_IHDR(png_ptr, info_ptr, length); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 906 | else if (!png_memcmp(chunk_name, png_IEND, 4)) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 907 | png_handle_IEND(png_ptr, info_ptr, length); |
| 908 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 909 | else if (png_handle_as_unknown(png_ptr, chunk_name)) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 910 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 911 | if (!png_memcmp(chunk_name, png_IDAT, 4)) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 912 | { |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 913 | if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) |
| 914 | png_benign_error(png_ptr, "Too many IDAT's found"); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 915 | } |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 916 | png_handle_unknown(png_ptr, info_ptr, length); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 917 | if (!png_memcmp(chunk_name, png_PLTE, 4)) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 918 | png_ptr->mode |= PNG_HAVE_PLTE; |
| 919 | } |
| 920 | #endif |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 921 | else if (!png_memcmp(chunk_name, png_IDAT, 4)) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 922 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 923 | /* Zero length IDATs are legal after the last IDAT has been |
| 924 | * read, but not after other chunks have been read. |
| 925 | */ |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 926 | if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) |
| 927 | png_benign_error(png_ptr, "Too many IDAT's found"); |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 928 | png_crc_finish(png_ptr, length); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 929 | } |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 930 | else if (!png_memcmp(chunk_name, png_PLTE, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 931 | png_handle_PLTE(png_ptr, info_ptr, length); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 932 | #if defined(PNG_READ_bKGD_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 933 | else if (!png_memcmp(chunk_name, png_bKGD, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 934 | png_handle_bKGD(png_ptr, info_ptr, length); |
| 935 | #endif |
| 936 | #if defined(PNG_READ_cHRM_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 937 | else if (!png_memcmp(chunk_name, png_cHRM, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 938 | png_handle_cHRM(png_ptr, info_ptr, length); |
| 939 | #endif |
| 940 | #if defined(PNG_READ_gAMA_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 941 | else if (!png_memcmp(chunk_name, png_gAMA, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 942 | png_handle_gAMA(png_ptr, info_ptr, length); |
| 943 | #endif |
| 944 | #if defined(PNG_READ_hIST_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 945 | else if (!png_memcmp(chunk_name, png_hIST, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 946 | png_handle_hIST(png_ptr, info_ptr, length); |
| 947 | #endif |
| 948 | #if defined(PNG_READ_oFFs_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 949 | else if (!png_memcmp(chunk_name, png_oFFs, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 950 | png_handle_oFFs(png_ptr, info_ptr, length); |
| 951 | #endif |
| 952 | #if defined(PNG_READ_pCAL_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 953 | else if (!png_memcmp(chunk_name, png_pCAL, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 954 | png_handle_pCAL(png_ptr, info_ptr, length); |
| 955 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 956 | #if defined(PNG_READ_sCAL_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 957 | else if (!png_memcmp(chunk_name, png_sCAL, 4)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 958 | png_handle_sCAL(png_ptr, info_ptr, length); |
| 959 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 960 | #if defined(PNG_READ_pHYs_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 961 | else if (!png_memcmp(chunk_name, png_pHYs, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 962 | png_handle_pHYs(png_ptr, info_ptr, length); |
| 963 | #endif |
| 964 | #if defined(PNG_READ_sBIT_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 965 | else if (!png_memcmp(chunk_name, png_sBIT, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 966 | png_handle_sBIT(png_ptr, info_ptr, length); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 967 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 968 | #if defined(PNG_READ_sRGB_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 969 | else if (!png_memcmp(chunk_name, png_sRGB, 4)) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 970 | png_handle_sRGB(png_ptr, info_ptr, length); |
| 971 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 972 | #if defined(PNG_READ_iCCP_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 973 | else if (!png_memcmp(chunk_name, png_iCCP, 4)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 974 | png_handle_iCCP(png_ptr, info_ptr, length); |
| 975 | #endif |
| 976 | #if defined(PNG_READ_sPLT_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 977 | else if (!png_memcmp(chunk_name, png_sPLT, 4)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 978 | png_handle_sPLT(png_ptr, info_ptr, length); |
| 979 | #endif |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 980 | #if defined(PNG_READ_tEXt_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 981 | else if (!png_memcmp(chunk_name, png_tEXt, 4)) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 982 | png_handle_tEXt(png_ptr, info_ptr, length); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 983 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 984 | #if defined(PNG_READ_tIME_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 985 | else if (!png_memcmp(chunk_name, png_tIME, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 986 | png_handle_tIME(png_ptr, info_ptr, length); |
| 987 | #endif |
| 988 | #if defined(PNG_READ_tRNS_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 989 | else if (!png_memcmp(chunk_name, png_tRNS, 4)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 990 | png_handle_tRNS(png_ptr, info_ptr, length); |
| 991 | #endif |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 992 | #if defined(PNG_READ_zTXt_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 993 | else if (!png_memcmp(chunk_name, png_zTXt, 4)) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 994 | png_handle_zTXt(png_ptr, info_ptr, length); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 995 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 996 | #if defined(PNG_READ_iTXt_SUPPORTED) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 997 | else if (!png_memcmp(chunk_name, png_iTXt, 4)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 998 | png_handle_iTXt(png_ptr, info_ptr, length); |
| 999 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1000 | else |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1001 | png_handle_unknown(png_ptr, info_ptr, length); |
| 1002 | } while (!(png_ptr->mode & PNG_HAVE_IEND)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1003 | } |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1004 | #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1005 | |
| 1006 | /* free all memory used by the read */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1007 | void PNGAPI |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1008 | png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1009 | png_infopp end_info_ptr_ptr) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1010 | { |
| 1011 | png_structp png_ptr = NULL; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1012 | png_infop info_ptr = NULL, end_info_ptr = NULL; |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1013 | #ifdef PNG_USER_MEM_SUPPORTED |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1014 | png_free_ptr free_fn; |
| 1015 | png_voidp mem_ptr; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1016 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1017 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1018 | png_debug(1, "in png_destroy_read_struct\n"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1019 | if (png_ptr_ptr != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1020 | png_ptr = *png_ptr_ptr; |
| 1021 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1022 | if (info_ptr_ptr != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1023 | info_ptr = *info_ptr_ptr; |
| 1024 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1025 | if (end_info_ptr_ptr != NULL) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1026 | end_info_ptr = *end_info_ptr_ptr; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1027 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1028 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1029 | free_fn = png_ptr->free_fn; |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1030 | mem_ptr = png_ptr->mem_ptr; |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1031 | #endif |
| 1032 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1033 | png_read_destroy(png_ptr, info_ptr, end_info_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1034 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1035 | if (info_ptr != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1036 | { |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1037 | #if defined(PNG_TEXT_SUPPORTED) |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1038 | png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1039 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1040 | |
| 1041 | #ifdef PNG_USER_MEM_SUPPORTED |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1042 | png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, |
| 1043 | (png_voidp)mem_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1044 | #else |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1045 | png_destroy_struct((png_voidp)info_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1046 | #endif |
Glenn Randers-Pehrson | 3f54925 | 2001-10-27 07:35:13 -0500 | [diff] [blame] | 1047 | *info_ptr_ptr = NULL; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1048 | } |
| 1049 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1050 | if (end_info_ptr != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1051 | { |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1052 | #if defined(PNG_READ_TEXT_SUPPORTED) |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1053 | png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1054 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1055 | #ifdef PNG_USER_MEM_SUPPORTED |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1056 | png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, |
| 1057 | (png_voidp)mem_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1058 | #else |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1059 | png_destroy_struct((png_voidp)end_info_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1060 | #endif |
Glenn Randers-Pehrson | 3f54925 | 2001-10-27 07:35:13 -0500 | [diff] [blame] | 1061 | *end_info_ptr_ptr = NULL; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1062 | } |
| 1063 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1064 | if (png_ptr != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1065 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1066 | #ifdef PNG_USER_MEM_SUPPORTED |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1067 | png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, |
| 1068 | (png_voidp)mem_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1069 | #else |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1070 | png_destroy_struct((png_voidp)png_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1071 | #endif |
Glenn Randers-Pehrson | 3f54925 | 2001-10-27 07:35:13 -0500 | [diff] [blame] | 1072 | *png_ptr_ptr = NULL; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1073 | } |
| 1074 | } |
| 1075 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1076 | /* free all memory used by the read (old method) */ |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 1077 | void /* PRIVATE */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1078 | png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1079 | { |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1080 | #ifdef PNG_SETJMP_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1081 | jmp_buf tmp_jmp; |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1082 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1083 | png_error_ptr error_fn; |
| 1084 | png_error_ptr warning_fn; |
| 1085 | png_voidp error_ptr; |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1086 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1087 | png_free_ptr free_fn; |
| 1088 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1089 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1090 | png_debug(1, "in png_read_destroy\n"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1091 | if (info_ptr != NULL) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1092 | png_info_destroy(png_ptr, info_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1093 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1094 | if (end_info_ptr != NULL) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1095 | png_info_destroy(png_ptr, end_info_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1096 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1097 | png_free(png_ptr, png_ptr->zbuf); |
Glenn Randers-Pehrson | 1b8e567 | 2001-08-25 06:46:06 -0500 | [diff] [blame] | 1098 | png_free(png_ptr, png_ptr->big_row_buf); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1099 | png_free(png_ptr, png_ptr->prev_row); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1100 | #if defined(PNG_READ_DITHER_SUPPORTED) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1101 | png_free(png_ptr, png_ptr->palette_lookup); |
| 1102 | png_free(png_ptr, png_ptr->dither_index); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1103 | #endif |
| 1104 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1105 | png_free(png_ptr, png_ptr->gamma_table); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1106 | #endif |
| 1107 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1108 | png_free(png_ptr, png_ptr->gamma_from_1); |
| 1109 | png_free(png_ptr, png_ptr->gamma_to_1); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1110 | #endif |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1111 | #ifdef PNG_FREE_ME_SUPPORTED |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1112 | if (png_ptr->free_me & PNG_FREE_PLTE) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1113 | png_zfree(png_ptr, png_ptr->palette); |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1114 | png_ptr->free_me &= ~PNG_FREE_PLTE; |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1115 | #else |
| 1116 | if (png_ptr->flags & PNG_FLAG_FREE_PLTE) |
| 1117 | png_zfree(png_ptr, png_ptr->palette); |
| 1118 | png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; |
| 1119 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1120 | #if defined(PNG_tRNS_SUPPORTED) || \ |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1121 | defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1122 | #ifdef PNG_FREE_ME_SUPPORTED |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1123 | if (png_ptr->free_me & PNG_FREE_TRNS) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1124 | png_free(png_ptr, png_ptr->trans); |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1125 | png_ptr->free_me &= ~PNG_FREE_TRNS; |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1126 | #else |
| 1127 | if (png_ptr->flags & PNG_FLAG_FREE_TRNS) |
| 1128 | png_free(png_ptr, png_ptr->trans); |
| 1129 | png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; |
| 1130 | #endif |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1131 | #endif |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1132 | #if defined(PNG_READ_hIST_SUPPORTED) |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1133 | #ifdef PNG_FREE_ME_SUPPORTED |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1134 | if (png_ptr->free_me & PNG_FREE_HIST) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1135 | png_free(png_ptr, png_ptr->hist); |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1136 | png_ptr->free_me &= ~PNG_FREE_HIST; |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1137 | #else |
| 1138 | if (png_ptr->flags & PNG_FLAG_FREE_HIST) |
| 1139 | png_free(png_ptr, png_ptr->hist); |
| 1140 | png_ptr->flags &= ~PNG_FLAG_FREE_HIST; |
| 1141 | #endif |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1142 | #endif |
| 1143 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1144 | if (png_ptr->gamma_16_table != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1145 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1146 | int i; |
| 1147 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1148 | for (i = 0; i < istop; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1149 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1150 | png_free(png_ptr, png_ptr->gamma_16_table[i]); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1151 | } |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1152 | png_free(png_ptr, png_ptr->gamma_16_table); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1153 | } |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1154 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1155 | if (png_ptr->gamma_16_from_1 != NULL) |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1156 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1157 | int i; |
| 1158 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1159 | for (i = 0; i < istop; i++) |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1160 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1161 | png_free(png_ptr, png_ptr->gamma_16_from_1[i]); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1162 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1163 | png_free(png_ptr, png_ptr->gamma_16_from_1); |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1164 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1165 | if (png_ptr->gamma_16_to_1 != NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1166 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1167 | int i; |
| 1168 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1169 | for (i = 0; i < istop; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1170 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1171 | png_free(png_ptr, png_ptr->gamma_16_to_1[i]); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1172 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1173 | png_free(png_ptr, png_ptr->gamma_16_to_1); |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1174 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1175 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1176 | #endif |
| 1177 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 1178 | png_free(png_ptr, png_ptr->time_buffer); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1179 | #endif |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1180 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1181 | inflateEnd(&png_ptr->zstream); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1182 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1183 | png_free(png_ptr, png_ptr->save_buffer); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1184 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1185 | |
Glenn Randers-Pehrson | d1e8c86 | 2002-06-20 06:54:34 -0500 | [diff] [blame] | 1186 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 1187 | #ifdef PNG_TEXT_SUPPORTED |
| 1188 | png_free(png_ptr, png_ptr->current_text); |
| 1189 | #endif /* PNG_TEXT_SUPPORTED */ |
| 1190 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 1191 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1192 | /* Save the important info out of the png_struct, in case it is |
| 1193 | * being used again. |
| 1194 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1195 | #ifdef PNG_SETJMP_SUPPORTED |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 1196 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof(jmp_buf)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1197 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1198 | |
| 1199 | error_fn = png_ptr->error_fn; |
| 1200 | warning_fn = png_ptr->warning_fn; |
| 1201 | error_ptr = png_ptr->error_ptr; |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1202 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1203 | free_fn = png_ptr->free_fn; |
| 1204 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1205 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 1206 | png_memset(png_ptr, 0, sizeof(png_struct)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1207 | |
| 1208 | png_ptr->error_fn = error_fn; |
| 1209 | png_ptr->warning_fn = warning_fn; |
| 1210 | png_ptr->error_ptr = error_ptr; |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1211 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1212 | png_ptr->free_fn = free_fn; |
| 1213 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1214 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1215 | #ifdef PNG_SETJMP_SUPPORTED |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 1216 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof(jmp_buf)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1217 | #endif |
| 1218 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1219 | } |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1220 | |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1221 | void PNGAPI |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1222 | png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) |
| 1223 | { |
| 1224 | png_ptr->read_row_fn = read_row_fn; |
| 1225 | } |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1226 | |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1227 | |
| 1228 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1229 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1230 | void PNGAPI |
| 1231 | png_read_png(png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1232 | int transforms, |
| 1233 | voidp params) |
| 1234 | { |
| 1235 | int row; |
| 1236 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1237 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1238 | /* invert the alpha channel from opacity to transparency |
| 1239 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1240 | if (transforms & PNG_TRANSFORM_INVERT_ALPHA) |
| 1241 | png_set_invert_alpha(png_ptr); |
| 1242 | #endif |
| 1243 | |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1244 | /* png_read_info() gives us all of the information from the |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1245 | * PNG file before the first IDAT (image data chunk). |
| 1246 | */ |
| 1247 | png_read_info(png_ptr, info_ptr); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 1248 | if (info_ptr->height > PNG_UINT_32_MAX/sizeof(png_bytep)) |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1249 | png_error(png_ptr,"Image is too high to process with png_read_png()"); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1250 | |
| 1251 | /* -------------- image transformations start here ------------------- */ |
| 1252 | |
| 1253 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1254 | /* tell libpng to strip 16 bit/color files down to 8 bits per color |
| 1255 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1256 | if (transforms & PNG_TRANSFORM_STRIP_16) |
| 1257 | png_set_strip_16(png_ptr); |
| 1258 | #endif |
| 1259 | |
| 1260 | #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1261 | /* Strip alpha bytes from the input data without combining with |
| 1262 | * the background (not recommended). |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1263 | */ |
| 1264 | if (transforms & PNG_TRANSFORM_STRIP_ALPHA) |
| 1265 | png_set_strip_alpha(png_ptr); |
| 1266 | #endif |
| 1267 | |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1268 | #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1269 | /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1270 | * byte into separate bytes (useful for paletted and grayscale images). |
| 1271 | */ |
| 1272 | if (transforms & PNG_TRANSFORM_PACKING) |
| 1273 | png_set_packing(png_ptr); |
| 1274 | #endif |
| 1275 | |
| 1276 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 1277 | /* Change the order of packed pixels to least significant bit first |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1278 | * (not useful if you are using png_set_packing). |
| 1279 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1280 | if (transforms & PNG_TRANSFORM_PACKSWAP) |
| 1281 | png_set_packswap(png_ptr); |
| 1282 | #endif |
| 1283 | |
| 1284 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
| 1285 | /* Expand paletted colors into true RGB triplets |
| 1286 | * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel |
| 1287 | * Expand paletted or RGB images with transparency to full alpha |
| 1288 | * channels so the data will be available as RGBA quartets. |
| 1289 | */ |
| 1290 | if (transforms & PNG_TRANSFORM_EXPAND) |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1291 | if ((png_ptr->bit_depth < 8) || |
| 1292 | (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || |
| 1293 | (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) |
| 1294 | png_set_expand(png_ptr); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1295 | #endif |
| 1296 | |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1297 | /* We don't handle background color or gamma transformation or dithering. |
| 1298 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1299 | |
| 1300 | #if defined(PNG_READ_INVERT_SUPPORTED) |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1301 | /* invert monochrome files to have 0 as white and 1 as black |
| 1302 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1303 | if (transforms & PNG_TRANSFORM_INVERT_MONO) |
| 1304 | png_set_invert_mono(png_ptr); |
| 1305 | #endif |
| 1306 | |
| 1307 | #if defined(PNG_READ_SHIFT_SUPPORTED) |
| 1308 | /* If you want to shift the pixel values from the range [0,255] or |
| 1309 | * [0,65535] to the original [0,7] or [0,31], or whatever range the |
| 1310 | * colors were originally in: |
| 1311 | */ |
| 1312 | if ((transforms & PNG_TRANSFORM_SHIFT) |
| 1313 | && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT)) |
| 1314 | { |
| 1315 | png_color_8p sig_bit; |
| 1316 | |
| 1317 | png_get_sBIT(png_ptr, info_ptr, &sig_bit); |
| 1318 | png_set_shift(png_ptr, sig_bit); |
| 1319 | } |
| 1320 | #endif |
| 1321 | |
| 1322 | #if defined(PNG_READ_BGR_SUPPORTED) |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1323 | /* flip the RGB pixels to BGR (or RGBA to BGRA) |
| 1324 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1325 | if (transforms & PNG_TRANSFORM_BGR) |
| 1326 | png_set_bgr(png_ptr); |
| 1327 | #endif |
| 1328 | |
| 1329 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1330 | /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) |
| 1331 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1332 | if (transforms & PNG_TRANSFORM_SWAP_ALPHA) |
| 1333 | png_set_swap_alpha(png_ptr); |
| 1334 | #endif |
| 1335 | |
| 1336 | #if defined(PNG_READ_SWAP_SUPPORTED) |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 1337 | /* swap bytes of 16 bit files to least significant byte first |
| 1338 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1339 | if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) |
| 1340 | png_set_swap(png_ptr); |
| 1341 | #endif |
| 1342 | |
| 1343 | /* We don't handle adding filler bytes */ |
| 1344 | |
| 1345 | /* Optional call to gamma correct and add the background to the palette |
| 1346 | * and update info structure. REQUIRED if you are expecting libpng to |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 1347 | * update the palette for you (i.e., you selected such a transform above). |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1348 | */ |
| 1349 | png_read_update_info(png_ptr, info_ptr); |
| 1350 | |
| 1351 | /* -------------- image transformations end here ------------------- */ |
| 1352 | |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1353 | #ifdef PNG_FREE_ME_SUPPORTED |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1354 | png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1355 | #endif |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1356 | if(info_ptr->row_pointers == NULL) |
| 1357 | { |
| 1358 | info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame^] | 1359 | info_ptr->height * sizeof(png_bytep)); |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1360 | #ifdef PNG_FREE_ME_SUPPORTED |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1361 | info_ptr->free_me |= PNG_FREE_ROWS; |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1362 | #endif |
| 1363 | for (row = 0; row < (int)info_ptr->height; row++) |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 1364 | { |
| 1365 | info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1366 | png_get_rowbytes(png_ptr, info_ptr)); |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 1367 | } |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1368 | } |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1369 | |
| 1370 | png_read_image(png_ptr, info_ptr->row_pointers); |
| 1371 | info_ptr->valid |= PNG_INFO_IDAT; |
| 1372 | |
| 1373 | /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ |
| 1374 | png_read_end(png_ptr, info_ptr); |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 1375 | |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 1376 | if(transforms == 0 || params == NULL) |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 1377 | /* quiet compiler warnings */ return; |
| 1378 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1379 | } |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1380 | #endif /* PNG_INFO_IMAGE_SUPPORTED */ |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1381 | #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1382 | #endif /* PNG_READ_SUPPORTED */ |