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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 96 | giacomo | 1 | |
| 2 | /* pngread.c - read a PNG file |
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| 3 | * |
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| 4 | * libpng 1.2.5 - October 3, 2002 |
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| 5 | * For conditions of distribution and use, see copyright notice in png.h |
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| 6 | * Copyright (c) 1998-2002 Glenn Randers-Pehrson |
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| 7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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| 8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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| 9 | * |
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| 10 | * This file contains routines that an application calls directly to |
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| 11 | * read a PNG file or stream. |
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| 12 | */ |
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| 13 | |||
| 14 | #define PNG_INTERNAL |
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| 15 | #include "png.h" |
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| 16 | |||
| 17 | /* Create a PNG structure for reading, and allocate any memory needed. */ |
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| 18 | png_structp PNGAPI |
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| 19 | png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, |
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| 20 | png_error_ptr error_fn, png_error_ptr warn_fn) |
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| 21 | { |
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| 22 | |||
| 23 | #ifdef PNG_USER_MEM_SUPPORTED |
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| 24 | return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, |
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| 25 | warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL)); |
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| 26 | } |
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| 27 | |||
| 28 | /* Alternate create PNG structure for reading, and allocate any memory needed. */ |
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| 29 | png_structp PNGAPI |
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| 30 | png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, |
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| 31 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
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| 32 | png_malloc_ptr malloc_fn, png_free_ptr free_fn) |
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| 33 | { |
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| 34 | #endif /* PNG_USER_MEM_SUPPORTED */ |
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| 35 | |||
| 36 | png_structp png_ptr; |
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| 37 | |||
| 38 | #ifdef PNG_SETJMP_SUPPORTED |
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| 39 | #ifdef USE_FAR_KEYWORD |
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| 40 | jmp_buf jmpbuf; |
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| 41 | #endif |
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| 42 | #endif |
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| 43 | |||
| 44 | int i; |
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| 45 | |||
| 46 | png_debug(1, "in png_create_read_struct\n"); |
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| 47 | #ifdef PNG_USER_MEM_SUPPORTED |
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| 48 | png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, |
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| 49 | (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); |
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| 50 | #else |
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| 51 | png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
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| 52 | #endif |
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| 53 | if (png_ptr == NULL) |
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| 54 | return (NULL); |
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| 55 | |||
| 56 | #if !defined(PNG_1_0_X) |
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| 57 | #ifdef PNG_ASSEMBLER_CODE_SUPPORTED |
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| 58 | png_init_mmx_flags(png_ptr); /* 1.2.0 addition */ |
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| 59 | #endif |
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| 60 | #endif /* PNG_1_0_X */ |
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| 61 | |||
| 62 | #ifdef PNG_SETJMP_SUPPORTED |
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| 63 | #ifdef USE_FAR_KEYWORD |
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| 64 | if (setjmp(jmpbuf)) |
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| 65 | #else |
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| 66 | if (setjmp(png_ptr->jmpbuf)) |
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| 67 | #endif |
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| 68 | { |
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| 69 | png_free(png_ptr, png_ptr->zbuf); |
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| 70 | png_ptr->zbuf=NULL; |
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| 71 | #ifdef PNG_USER_MEM_SUPPORTED |
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| 72 | png_destroy_struct_2((png_voidp)png_ptr, |
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| 73 | (png_free_ptr)free_fn, (png_voidp)mem_ptr); |
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| 74 | #else |
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| 75 | png_destroy_struct((png_voidp)png_ptr); |
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| 76 | #endif |
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| 77 | return (NULL); |
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| 78 | } |
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| 79 | #ifdef USE_FAR_KEYWORD |
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| 80 | png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); |
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| 81 | #endif |
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| 82 | #endif |
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| 83 | |||
| 84 | #ifdef PNG_USER_MEM_SUPPORTED |
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| 85 | png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); |
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| 86 | #endif |
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| 87 | |||
| 88 | png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); |
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| 89 | |||
| 90 | i=0; |
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| 91 | do |
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| 92 | { |
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| 93 | if(user_png_ver[i] != png_libpng_ver[i]) |
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| 94 | png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
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| 95 | } while (png_libpng_ver[i++]); |
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| 96 | |||
| 97 | if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) |
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| 98 | { |
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| 99 | /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so |
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| 100 | * we must recompile any applications that use any older library version. |
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| 101 | * For versions after libpng 1.0, we will be compatible, so we need |
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| 102 | * only check the first digit. |
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| 103 | */ |
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| 104 | if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || |
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| 105 | (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || |
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| 106 | (user_png_ver[0] == '0' && user_png_ver[2] < '9')) |
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| 107 | { |
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| 108 | #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) |
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| 109 | char msg[80]; |
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| 110 | if (user_png_ver) |
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| 111 | { |
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| 112 | sprintf(msg, "Application was compiled with png.h from libpng-%.20s", |
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| 113 | user_png_ver); |
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| 114 | png_warning(png_ptr, msg); |
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| 115 | } |
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| 116 | sprintf(msg, "Application is running with png.c from libpng-%.20s", |
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| 117 | png_libpng_ver); |
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| 118 | png_warning(png_ptr, msg); |
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| 119 | #endif |
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| 120 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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| 121 | png_ptr->flags=0; |
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| 122 | #endif |
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| 123 | png_error(png_ptr, |
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| 124 | "Incompatible libpng version in application and library"); |
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| 125 | } |
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| 126 | } |
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| 127 | |||
| 128 | /* initialize zbuf - compression buffer */ |
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| 129 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
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| 130 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
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| 131 | (png_uint_32)png_ptr->zbuf_size); |
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| 132 | png_ptr->zstream.zalloc = png_zalloc; |
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| 133 | png_ptr->zstream.zfree = png_zfree; |
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| 134 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
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| 135 | |||
| 136 | switch (inflateInit(&png_ptr->zstream)) |
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| 137 | { |
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| 138 | case Z_OK: /* Do nothing */ break; |
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| 139 | case Z_MEM_ERROR: |
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| 140 | case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break; |
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| 141 | case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break; |
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| 142 | default: png_error(png_ptr, "Unknown zlib error"); |
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| 143 | } |
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| 144 | |||
| 145 | png_ptr->zstream.next_out = png_ptr->zbuf; |
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| 146 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
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| 147 | |||
| 148 | png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); |
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| 149 | |||
| 150 | #ifdef PNG_SETJMP_SUPPORTED |
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| 151 | /* Applications that neglect to set up their own setjmp() and then encounter |
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| 152 | a png_error() will longjmp here. Since the jmpbuf is then meaningless we |
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| 153 | abort instead of returning. */ |
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| 154 | #ifdef USE_FAR_KEYWORD |
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| 155 | if (setjmp(jmpbuf)) |
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| 156 | PNG_ABORT(); |
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| 157 | png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); |
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| 158 | #else |
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| 159 | if (setjmp(png_ptr->jmpbuf)) |
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| 160 | PNG_ABORT(); |
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| 161 | #endif |
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| 162 | #endif |
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| 163 | return (png_ptr); |
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| 164 | } |
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| 165 | |||
| 166 | /* Initialize PNG structure for reading, and allocate any memory needed. |
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| 167 | This interface is deprecated in favour of the png_create_read_struct(), |
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| 168 | and it will eventually disappear. */ |
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| 169 | #undef png_read_init |
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| 170 | void PNGAPI |
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| 171 | png_read_init(png_structp png_ptr) |
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| 172 | { |
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| 173 | /* We only come here via pre-1.0.7-compiled applications */ |
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| 174 | png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0); |
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| 175 | } |
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| 176 | |||
| 177 | void PNGAPI |
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| 178 | png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver, |
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| 179 | png_size_t png_struct_size, png_size_t png_info_size) |
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| 180 | { |
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| 181 | /* We only come here via pre-1.0.12-compiled applications */ |
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| 182 | #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) |
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| 183 | if(sizeof(png_struct) > png_struct_size || sizeof(png_info) > png_info_size) |
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| 184 | { |
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| 185 | char msg[80]; |
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| 186 | png_ptr->warning_fn=NULL; |
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| 187 | if (user_png_ver) |
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| 188 | { |
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| 189 | sprintf(msg, "Application was compiled with png.h from libpng-%.20s", |
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| 190 | user_png_ver); |
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| 191 | png_warning(png_ptr, msg); |
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| 192 | } |
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| 193 | sprintf(msg, "Application is running with png.c from libpng-%.20s", |
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| 194 | png_libpng_ver); |
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| 195 | png_warning(png_ptr, msg); |
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| 196 | } |
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| 197 | #endif |
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| 198 | if(sizeof(png_struct) > png_struct_size) |
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| 199 | { |
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| 200 | png_ptr->error_fn=NULL; |
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| 201 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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| 202 | png_ptr->flags=0; |
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| 203 | #endif |
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| 204 | png_error(png_ptr, |
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| 205 | "The png struct allocated by the application for reading is too small."); |
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| 206 | } |
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| 207 | if(sizeof(png_info) > png_info_size) |
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| 208 | { |
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| 209 | png_ptr->error_fn=NULL; |
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| 210 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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| 211 | png_ptr->flags=0; |
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| 212 | #endif |
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| 213 | png_error(png_ptr, |
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| 214 | "The info struct allocated by application for reading is too small."); |
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| 215 | } |
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| 216 | png_read_init_3(&png_ptr, user_png_ver, png_struct_size); |
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| 217 | } |
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| 218 | |||
| 219 | void PNGAPI |
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| 220 | png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, |
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| 221 | png_size_t png_struct_size) |
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| 222 | { |
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| 223 | #ifdef PNG_SETJMP_SUPPORTED |
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| 224 | jmp_buf tmp_jmp; /* to save current jump buffer */ |
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| 225 | #endif |
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| 226 | |||
| 227 | int i=0; |
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| 228 | |||
| 229 | png_structp png_ptr=*ptr_ptr; |
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| 230 | |||
| 231 | do |
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| 232 | { |
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| 233 | if(user_png_ver[i] != png_libpng_ver[i]) |
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| 234 | { |
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| 235 | #ifdef PNG_LEGACY_SUPPORTED |
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| 236 | png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
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| 237 | #else |
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| 238 | png_ptr->warning_fn=NULL; |
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| 239 | png_warning(png_ptr, |
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| 240 | "Application uses deprecated png_read_init() and should be recompiled."); |
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| 241 | break; |
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| 242 | #endif |
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| 243 | } |
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| 244 | } while (png_libpng_ver[i++]); |
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| 245 | |||
| 246 | png_debug(1, "in png_read_init_3\n"); |
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| 247 | |||
| 248 | #ifdef PNG_SETJMP_SUPPORTED |
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| 249 | /* save jump buffer and error functions */ |
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| 250 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); |
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| 251 | #endif |
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| 252 | |||
| 253 | if(sizeof(png_struct) > png_struct_size) |
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| 254 | { |
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| 255 | png_destroy_struct(png_ptr); |
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| 256 | *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
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| 257 | png_ptr = *ptr_ptr; |
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| 258 | } |
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| 259 | |||
| 260 | /* reset all variables to 0 */ |
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| 261 | png_memset(png_ptr, 0, sizeof (png_struct)); |
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| 262 | |||
| 263 | #ifdef PNG_SETJMP_SUPPORTED |
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| 264 | /* restore jump buffer */ |
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| 265 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); |
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| 266 | #endif |
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| 267 | |||
| 268 | /* initialize zbuf - compression buffer */ |
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| 269 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
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| 270 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
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| 271 | (png_uint_32)png_ptr->zbuf_size); |
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| 272 | png_ptr->zstream.zalloc = png_zalloc; |
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| 273 | png_ptr->zstream.zfree = png_zfree; |
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| 274 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
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| 275 | |||
| 276 | switch (inflateInit(&png_ptr->zstream)) |
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| 277 | { |
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| 278 | case Z_OK: /* Do nothing */ break; |
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| 279 | case Z_MEM_ERROR: |
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| 280 | case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break; |
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| 281 | case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break; |
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| 282 | default: png_error(png_ptr, "Unknown zlib error"); |
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| 283 | } |
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| 284 | |||
| 285 | png_ptr->zstream.next_out = png_ptr->zbuf; |
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| 286 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
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| 287 | |||
| 288 | png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); |
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| 289 | } |
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| 290 | |||
| 291 | /* Read the information before the actual image data. This has been |
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| 292 | * changed in v0.90 to allow reading a file that already has the magic |
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| 293 | * bytes read from the stream. You can tell libpng how many bytes have |
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| 294 | * been read from the beginning of the stream (up to the maximum of 8) |
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| 295 | * via png_set_sig_bytes(), and we will only check the remaining bytes |
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| 296 | * here. The application can then have access to the signature bytes we |
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| 297 | * read if it is determined that this isn't a valid PNG file. |
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| 298 | */ |
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| 299 | void PNGAPI |
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| 300 | png_read_info(png_structp png_ptr, png_infop info_ptr) |
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| 301 | { |
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| 302 | png_debug(1, "in png_read_info\n"); |
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| 303 | /* If we haven't checked all of the PNG signature bytes, do so now. */ |
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| 304 | if (png_ptr->sig_bytes < 8) |
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| 305 | { |
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| 306 | png_size_t num_checked = png_ptr->sig_bytes, |
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| 307 | num_to_check = 8 - num_checked; |
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| 308 | |||
| 309 | png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); |
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| 310 | png_ptr->sig_bytes = 8; |
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| 311 | |||
| 312 | if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
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| 313 | { |
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| 314 | if (num_checked < 4 && |
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| 315 | png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
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| 316 | png_error(png_ptr, "Not a PNG file"); |
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| 317 | else |
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| 318 | png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
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| 319 | } |
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| 320 | if (num_checked < 3) |
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| 321 | png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; |
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| 322 | } |
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| 323 | |||
| 324 | for(;;) |
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| 325 | { |
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| 326 | #ifdef PNG_USE_LOCAL_ARRAYS |
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| 327 | PNG_IHDR; |
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| 328 | PNG_IDAT; |
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| 329 | PNG_IEND; |
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| 330 | PNG_PLTE; |
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| 331 | #if defined(PNG_READ_bKGD_SUPPORTED) |
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| 332 | PNG_bKGD; |
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| 333 | #endif |
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| 334 | #if defined(PNG_READ_cHRM_SUPPORTED) |
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| 335 | PNG_cHRM; |
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| 336 | #endif |
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| 337 | #if defined(PNG_READ_gAMA_SUPPORTED) |
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| 338 | PNG_gAMA; |
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| 339 | #endif |
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| 340 | #if defined(PNG_READ_hIST_SUPPORTED) |
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| 341 | PNG_hIST; |
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| 342 | #endif |
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| 343 | #if defined(PNG_READ_iCCP_SUPPORTED) |
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| 344 | PNG_iCCP; |
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| 345 | #endif |
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| 346 | #if defined(PNG_READ_iTXt_SUPPORTED) |
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| 347 | PNG_iTXt; |
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| 348 | #endif |
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| 349 | #if defined(PNG_READ_oFFs_SUPPORTED) |
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| 350 | PNG_oFFs; |
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| 351 | #endif |
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| 352 | #if defined(PNG_READ_pCAL_SUPPORTED) |
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| 353 | PNG_pCAL; |
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| 354 | #endif |
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| 355 | #if defined(PNG_READ_pHYs_SUPPORTED) |
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| 356 | PNG_pHYs; |
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| 357 | #endif |
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| 358 | #if defined(PNG_READ_sBIT_SUPPORTED) |
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| 359 | PNG_sBIT; |
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| 360 | #endif |
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| 361 | #if defined(PNG_READ_sCAL_SUPPORTED) |
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| 362 | PNG_sCAL; |
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| 363 | #endif |
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| 364 | #if defined(PNG_READ_sPLT_SUPPORTED) |
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| 365 | PNG_sPLT; |
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| 366 | #endif |
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| 367 | #if defined(PNG_READ_sRGB_SUPPORTED) |
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| 368 | PNG_sRGB; |
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| 369 | #endif |
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| 370 | #if defined(PNG_READ_tEXt_SUPPORTED) |
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| 371 | PNG_tEXt; |
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| 372 | #endif |
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| 373 | #if defined(PNG_READ_tIME_SUPPORTED) |
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| 374 | PNG_tIME; |
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| 375 | #endif |
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| 376 | #if defined(PNG_READ_tRNS_SUPPORTED) |
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| 377 | PNG_tRNS; |
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| 378 | #endif |
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| 379 | #if defined(PNG_READ_zTXt_SUPPORTED) |
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| 380 | PNG_zTXt; |
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| 381 | #endif |
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| 382 | #endif /* PNG_GLOBAL_ARRAYS */ |
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| 383 | png_byte chunk_length[4]; |
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| 384 | png_uint_32 length; |
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| 385 | |||
| 386 | png_read_data(png_ptr, chunk_length, 4); |
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| 387 | length = png_get_uint_32(chunk_length); |
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| 388 | |||
| 389 | png_reset_crc(png_ptr); |
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| 390 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
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| 391 | |||
| 392 | png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name, |
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| 393 | length); |
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| 394 | |||
| 395 | if (length > PNG_MAX_UINT) |
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| 396 | png_error(png_ptr, "Invalid chunk length."); |
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| 397 | |||
| 398 | /* This should be a binary subdivision search or a hash for |
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| 399 | * matching the chunk name rather than a linear search. |
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| 400 | */ |
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| 401 | if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
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| 402 | png_handle_IHDR(png_ptr, info_ptr, length); |
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| 403 | else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
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| 404 | png_handle_IEND(png_ptr, info_ptr, length); |
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| 405 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
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| 406 | else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) |
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| 407 | { |
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| 408 | if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
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| 409 | png_ptr->mode |= PNG_HAVE_IDAT; |
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| 410 | png_handle_unknown(png_ptr, info_ptr, length); |
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| 411 | if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
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| 412 | png_ptr->mode |= PNG_HAVE_PLTE; |
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| 413 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
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| 414 | { |
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| 415 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
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| 416 | png_error(png_ptr, "Missing IHDR before IDAT"); |
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| 417 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
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| 418 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
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| 419 | png_error(png_ptr, "Missing PLTE before IDAT"); |
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| 420 | break; |
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| 421 | } |
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| 422 | } |
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| 423 | #endif |
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| 424 | else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
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| 425 | png_handle_PLTE(png_ptr, info_ptr, length); |
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| 426 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
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| 427 | { |
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| 428 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
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| 429 | png_error(png_ptr, "Missing IHDR before IDAT"); |
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| 430 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
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| 431 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
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| 432 | png_error(png_ptr, "Missing PLTE before IDAT"); |
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| 433 | |||
| 434 | png_ptr->idat_size = length; |
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| 435 | png_ptr->mode |= PNG_HAVE_IDAT; |
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| 436 | break; |
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| 437 | } |
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| 438 | #if defined(PNG_READ_bKGD_SUPPORTED) |
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| 439 | else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
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| 440 | png_handle_bKGD(png_ptr, info_ptr, length); |
||
| 441 | #endif |
||
| 442 | #if defined(PNG_READ_cHRM_SUPPORTED) |
||
| 443 | else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
||
| 444 | png_handle_cHRM(png_ptr, info_ptr, length); |
||
| 445 | #endif |
||
| 446 | #if defined(PNG_READ_gAMA_SUPPORTED) |
||
| 447 | else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
||
| 448 | png_handle_gAMA(png_ptr, info_ptr, length); |
||
| 449 | #endif |
||
| 450 | #if defined(PNG_READ_hIST_SUPPORTED) |
||
| 451 | else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
||
| 452 | png_handle_hIST(png_ptr, info_ptr, length); |
||
| 453 | #endif |
||
| 454 | #if defined(PNG_READ_oFFs_SUPPORTED) |
||
| 455 | else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
||
| 456 | png_handle_oFFs(png_ptr, info_ptr, length); |
||
| 457 | #endif |
||
| 458 | #if defined(PNG_READ_pCAL_SUPPORTED) |
||
| 459 | else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
||
| 460 | png_handle_pCAL(png_ptr, info_ptr, length); |
||
| 461 | #endif |
||
| 462 | #if defined(PNG_READ_sCAL_SUPPORTED) |
||
| 463 | else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) |
||
| 464 | png_handle_sCAL(png_ptr, info_ptr, length); |
||
| 465 | #endif |
||
| 466 | #if defined(PNG_READ_pHYs_SUPPORTED) |
||
| 467 | else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
||
| 468 | png_handle_pHYs(png_ptr, info_ptr, length); |
||
| 469 | #endif |
||
| 470 | #if defined(PNG_READ_sBIT_SUPPORTED) |
||
| 471 | else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
||
| 472 | png_handle_sBIT(png_ptr, info_ptr, length); |
||
| 473 | #endif |
||
| 474 | #if defined(PNG_READ_sRGB_SUPPORTED) |
||
| 475 | else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
||
| 476 | png_handle_sRGB(png_ptr, info_ptr, length); |
||
| 477 | #endif |
||
| 478 | #if defined(PNG_READ_iCCP_SUPPORTED) |
||
| 479 | else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) |
||
| 480 | png_handle_iCCP(png_ptr, info_ptr, length); |
||
| 481 | #endif |
||
| 482 | #if defined(PNG_READ_sPLT_SUPPORTED) |
||
| 483 | else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) |
||
| 484 | png_handle_sPLT(png_ptr, info_ptr, length); |
||
| 485 | #endif |
||
| 486 | #if defined(PNG_READ_tEXt_SUPPORTED) |
||
| 487 | else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
||
| 488 | png_handle_tEXt(png_ptr, info_ptr, length); |
||
| 489 | #endif |
||
| 490 | #if defined(PNG_READ_tIME_SUPPORTED) |
||
| 491 | else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
||
| 492 | png_handle_tIME(png_ptr, info_ptr, length); |
||
| 493 | #endif |
||
| 494 | #if defined(PNG_READ_tRNS_SUPPORTED) |
||
| 495 | else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
||
| 496 | png_handle_tRNS(png_ptr, info_ptr, length); |
||
| 497 | #endif |
||
| 498 | #if defined(PNG_READ_zTXt_SUPPORTED) |
||
| 499 | else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
||
| 500 | png_handle_zTXt(png_ptr, info_ptr, length); |
||
| 501 | #endif |
||
| 502 | #if defined(PNG_READ_iTXt_SUPPORTED) |
||
| 503 | else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) |
||
| 504 | png_handle_iTXt(png_ptr, info_ptr, length); |
||
| 505 | #endif |
||
| 506 | else |
||
| 507 | png_handle_unknown(png_ptr, info_ptr, length); |
||
| 508 | } |
||
| 509 | } |
||
| 510 | |||
| 511 | /* optional call to update the users info_ptr structure */ |
||
| 512 | void PNGAPI |
||
| 513 | png_read_update_info(png_structp png_ptr, png_infop info_ptr) |
||
| 514 | { |
||
| 515 | png_debug(1, "in png_read_update_info\n"); |
||
| 516 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
||
| 517 | png_read_start_row(png_ptr); |
||
| 518 | else |
||
| 519 | png_warning(png_ptr, |
||
| 520 | "Ignoring extra png_read_update_info() call; row buffer not reallocated"); |
||
| 521 | png_read_transform_info(png_ptr, info_ptr); |
||
| 522 | } |
||
| 523 | |||
| 524 | /* Initialize palette, background, etc, after transformations |
||
| 525 | * are set, but before any reading takes place. This allows |
||
| 526 | * the user to obtain a gamma-corrected palette, for example. |
||
| 527 | * If the user doesn't call this, we will do it ourselves. |
||
| 528 | */ |
||
| 529 | void PNGAPI |
||
| 530 | png_start_read_image(png_structp png_ptr) |
||
| 531 | { |
||
| 532 | png_debug(1, "in png_start_read_image\n"); |
||
| 533 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
||
| 534 | png_read_start_row(png_ptr); |
||
| 535 | } |
||
| 536 | |||
| 537 | void PNGAPI |
||
| 538 | png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) |
||
| 539 | { |
||
| 540 | #ifdef PNG_USE_LOCAL_ARRAYS |
||
| 541 | PNG_IDAT; |
||
| 542 | const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
||
| 543 | const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
||
| 544 | #endif |
||
| 545 | int ret; |
||
| 546 | png_debug2(1, "in png_read_row (row %lu, pass %d)\n", |
||
| 547 | png_ptr->row_number, png_ptr->pass); |
||
| 548 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
||
| 549 | png_read_start_row(png_ptr); |
||
| 550 | if (png_ptr->row_number == 0 && png_ptr->pass == 0) |
||
| 551 | { |
||
| 552 | /* check for transforms that have been set but were defined out */ |
||
| 553 | #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED) |
||
| 554 | if (png_ptr->transformations & PNG_INVERT_MONO) |
||
| 555 | png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined."); |
||
| 556 | #endif |
||
| 557 | #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED) |
||
| 558 | if (png_ptr->transformations & PNG_FILLER) |
||
| 559 | png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined."); |
||
| 560 | #endif |
||
| 561 | #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED) |
||
| 562 | if (png_ptr->transformations & PNG_PACKSWAP) |
||
| 563 | png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined."); |
||
| 564 | #endif |
||
| 565 | #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED) |
||
| 566 | if (png_ptr->transformations & PNG_PACK) |
||
| 567 | png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined."); |
||
| 568 | #endif |
||
| 569 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) |
||
| 570 | if (png_ptr->transformations & PNG_SHIFT) |
||
| 571 | png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined."); |
||
| 572 | #endif |
||
| 573 | #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED) |
||
| 574 | if (png_ptr->transformations & PNG_BGR) |
||
| 575 | png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined."); |
||
| 576 | #endif |
||
| 577 | #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED) |
||
| 578 | if (png_ptr->transformations & PNG_SWAP_BYTES) |
||
| 579 | png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined."); |
||
| 580 | #endif |
||
| 581 | } |
||
| 582 | |||
| 583 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
||
| 584 | /* if interlaced and we do not need a new row, combine row and return */ |
||
| 585 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
||
| 586 | { |
||
| 587 | switch (png_ptr->pass) |
||
| 588 | { |
||
| 589 | case 0: |
||
| 590 | if (png_ptr->row_number & 0x07) |
||
| 591 | { |
||
| 592 | if (dsp_row != NULL) |
||
| 593 | png_combine_row(png_ptr, dsp_row, |
||
| 594 | png_pass_dsp_mask[png_ptr->pass]); |
||
| 595 | png_read_finish_row(png_ptr); |
||
| 596 | return; |
||
| 597 | } |
||
| 598 | break; |
||
| 599 | case 1: |
||
| 600 | if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) |
||
| 601 | { |
||
| 602 | if (dsp_row != NULL) |
||
| 603 | png_combine_row(png_ptr, dsp_row, |
||
| 604 | png_pass_dsp_mask[png_ptr->pass]); |
||
| 605 | png_read_finish_row(png_ptr); |
||
| 606 | return; |
||
| 607 | } |
||
| 608 | break; |
||
| 609 | case 2: |
||
| 610 | if ((png_ptr->row_number & 0x07) != 4) |
||
| 611 | { |
||
| 612 | if (dsp_row != NULL && (png_ptr->row_number & 4)) |
||
| 613 | png_combine_row(png_ptr, dsp_row, |
||
| 614 | png_pass_dsp_mask[png_ptr->pass]); |
||
| 615 | png_read_finish_row(png_ptr); |
||
| 616 | return; |
||
| 617 | } |
||
| 618 | break; |
||
| 619 | case 3: |
||
| 620 | if ((png_ptr->row_number & 3) || png_ptr->width < 3) |
||
| 621 | { |
||
| 622 | if (dsp_row != NULL) |
||
| 623 | png_combine_row(png_ptr, dsp_row, |
||
| 624 | png_pass_dsp_mask[png_ptr->pass]); |
||
| 625 | png_read_finish_row(png_ptr); |
||
| 626 | return; |
||
| 627 | } |
||
| 628 | break; |
||
| 629 | case 4: |
||
| 630 | if ((png_ptr->row_number & 3) != 2) |
||
| 631 | { |
||
| 632 | if (dsp_row != NULL && (png_ptr->row_number & 2)) |
||
| 633 | png_combine_row(png_ptr, dsp_row, |
||
| 634 | png_pass_dsp_mask[png_ptr->pass]); |
||
| 635 | png_read_finish_row(png_ptr); |
||
| 636 | return; |
||
| 637 | } |
||
| 638 | break; |
||
| 639 | case 5: |
||
| 640 | if ((png_ptr->row_number & 1) || png_ptr->width < 2) |
||
| 641 | { |
||
| 642 | if (dsp_row != NULL) |
||
| 643 | png_combine_row(png_ptr, dsp_row, |
||
| 644 | png_pass_dsp_mask[png_ptr->pass]); |
||
| 645 | png_read_finish_row(png_ptr); |
||
| 646 | return; |
||
| 647 | } |
||
| 648 | break; |
||
| 649 | case 6: |
||
| 650 | if (!(png_ptr->row_number & 1)) |
||
| 651 | { |
||
| 652 | png_read_finish_row(png_ptr); |
||
| 653 | return; |
||
| 654 | } |
||
| 655 | break; |
||
| 656 | } |
||
| 657 | } |
||
| 658 | #endif |
||
| 659 | |||
| 660 | if (!(png_ptr->mode & PNG_HAVE_IDAT)) |
||
| 661 | png_error(png_ptr, "Invalid attempt to read row data"); |
||
| 662 | |||
| 663 | png_ptr->zstream.next_out = png_ptr->row_buf; |
||
| 664 | png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
||
| 665 | do |
||
| 666 | { |
||
| 667 | if (!(png_ptr->zstream.avail_in)) |
||
| 668 | { |
||
| 669 | while (!png_ptr->idat_size) |
||
| 670 | { |
||
| 671 | png_byte chunk_length[4]; |
||
| 672 | |||
| 673 | png_crc_finish(png_ptr, 0); |
||
| 674 | |||
| 675 | png_read_data(png_ptr, chunk_length, 4); |
||
| 676 | png_ptr->idat_size = png_get_uint_32(chunk_length); |
||
| 677 | |||
| 678 | if (png_ptr->idat_size > PNG_MAX_UINT) |
||
| 679 | png_error(png_ptr, "Invalid chunk length."); |
||
| 680 | |||
| 681 | png_reset_crc(png_ptr); |
||
| 682 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
||
| 683 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
||
| 684 | png_error(png_ptr, "Not enough image data"); |
||
| 685 | } |
||
| 686 | png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; |
||
| 687 | png_ptr->zstream.next_in = png_ptr->zbuf; |
||
| 688 | if (png_ptr->zbuf_size > png_ptr->idat_size) |
||
| 689 | png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; |
||
| 690 | png_crc_read(png_ptr, png_ptr->zbuf, |
||
| 691 | (png_size_t)png_ptr->zstream.avail_in); |
||
| 692 | png_ptr->idat_size -= png_ptr->zstream.avail_in; |
||
| 693 | } |
||
| 694 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
||
| 695 | if (ret == Z_STREAM_END) |
||
| 696 | { |
||
| 697 | if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || |
||
| 698 | png_ptr->idat_size) |
||
| 699 | png_error(png_ptr, "Extra compressed data"); |
||
| 700 | png_ptr->mode |= PNG_AFTER_IDAT; |
||
| 701 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
||
| 702 | break; |
||
| 703 | } |
||
| 704 | if (ret != Z_OK) |
||
| 705 | png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : |
||
| 706 | "Decompression error"); |
||
| 707 | |||
| 708 | } while (png_ptr->zstream.avail_out); |
||
| 709 | |||
| 710 | png_ptr->row_info.color_type = png_ptr->color_type; |
||
| 711 | png_ptr->row_info.width = png_ptr->iwidth; |
||
| 712 | png_ptr->row_info.channels = png_ptr->channels; |
||
| 713 | png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
||
| 714 | png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
||
| 715 | png_ptr->row_info.rowbytes = ((png_ptr->row_info.width * |
||
| 716 | (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3); |
||
| 717 | |||
| 718 | if(png_ptr->row_buf[0]) |
||
| 719 | png_read_filter_row(png_ptr, &(png_ptr->row_info), |
||
| 720 | png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
||
| 721 | (int)(png_ptr->row_buf[0])); |
||
| 722 | |||
| 723 | png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, |
||
| 724 | png_ptr->rowbytes + 1); |
||
| 725 | |||
| 726 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
||
| 727 | if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
||
| 728 | (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) |
||
| 729 | { |
||
| 730 | /* Intrapixel differencing */ |
||
| 731 | png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); |
||
| 732 | } |
||
| 733 | #endif |
||
| 734 | |||
| 735 | if (png_ptr->transformations) |
||
| 736 | png_do_read_transformations(png_ptr); |
||
| 737 | |||
| 738 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
||
| 739 | /* blow up interlaced rows to full size */ |
||
| 740 | if (png_ptr->interlaced && |
||
| 741 | (png_ptr->transformations & PNG_INTERLACE)) |
||
| 742 | { |
||
| 743 | if (png_ptr->pass < 6) |
||
| 744 | /* old interface (pre-1.0.9): |
||
| 745 | png_do_read_interlace(&(png_ptr->row_info), |
||
| 746 | png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
||
| 747 | */ |
||
| 748 | png_do_read_interlace(png_ptr); |
||
| 749 | |||
| 750 | if (dsp_row != NULL) |
||
| 751 | png_combine_row(png_ptr, dsp_row, |
||
| 752 | png_pass_dsp_mask[png_ptr->pass]); |
||
| 753 | if (row != NULL) |
||
| 754 | png_combine_row(png_ptr, row, |
||
| 755 | png_pass_mask[png_ptr->pass]); |
||
| 756 | } |
||
| 757 | else |
||
| 758 | #endif |
||
| 759 | { |
||
| 760 | if (row != NULL) |
||
| 761 | png_combine_row(png_ptr, row, 0xff); |
||
| 762 | if (dsp_row != NULL) |
||
| 763 | png_combine_row(png_ptr, dsp_row, 0xff); |
||
| 764 | } |
||
| 765 | png_read_finish_row(png_ptr); |
||
| 766 | |||
| 767 | if (png_ptr->read_row_fn != NULL) |
||
| 768 | (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); |
||
| 769 | } |
||
| 770 | |||
| 771 | /* Read one or more rows of image data. If the image is interlaced, |
||
| 772 | * and png_set_interlace_handling() has been called, the rows need to |
||
| 773 | * contain the contents of the rows from the previous pass. If the |
||
| 774 | * image has alpha or transparency, and png_handle_alpha()[*] has been |
||
| 775 | * called, the rows contents must be initialized to the contents of the |
||
| 776 | * screen. |
||
| 777 | * |
||
| 778 | * "row" holds the actual image, and pixels are placed in it |
||
| 779 | * as they arrive. If the image is displayed after each pass, it will |
||
| 780 | * appear to "sparkle" in. "display_row" can be used to display a |
||
| 781 | * "chunky" progressive image, with finer detail added as it becomes |
||
| 782 | * available. If you do not want this "chunky" display, you may pass |
||
| 783 | * NULL for display_row. If you do not want the sparkle display, and |
||
| 784 | * you have not called png_handle_alpha(), you may pass NULL for rows. |
||
| 785 | * If you have called png_handle_alpha(), and the image has either an |
||
| 786 | * alpha channel or a transparency chunk, you must provide a buffer for |
||
| 787 | * rows. In this case, you do not have to provide a display_row buffer |
||
| 788 | * also, but you may. If the image is not interlaced, or if you have |
||
| 789 | * not called png_set_interlace_handling(), the display_row buffer will |
||
| 790 | * be ignored, so pass NULL to it. |
||
| 791 | * |
||
| 792 | * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.5 |
||
| 793 | */ |
||
| 794 | |||
| 795 | void PNGAPI |
||
| 796 | png_read_rows(png_structp png_ptr, png_bytepp row, |
||
| 797 | png_bytepp display_row, png_uint_32 num_rows) |
||
| 798 | { |
||
| 799 | png_uint_32 i; |
||
| 800 | png_bytepp rp; |
||
| 801 | png_bytepp dp; |
||
| 802 | |||
| 803 | png_debug(1, "in png_read_rows\n"); |
||
| 804 | rp = row; |
||
| 805 | dp = display_row; |
||
| 806 | if (rp != NULL && dp != NULL) |
||
| 807 | for (i = 0; i < num_rows; i++) |
||
| 808 | { |
||
| 809 | png_bytep rptr = *rp++; |
||
| 810 | png_bytep dptr = *dp++; |
||
| 811 | |||
| 812 | png_read_row(png_ptr, rptr, dptr); |
||
| 813 | } |
||
| 814 | else if(rp != NULL) |
||
| 815 | for (i = 0; i < num_rows; i++) |
||
| 816 | { |
||
| 817 | png_bytep rptr = *rp; |
||
| 818 | png_read_row(png_ptr, rptr, png_bytep_NULL); |
||
| 819 | rp++; |
||
| 820 | } |
||
| 821 | else if(dp != NULL) |
||
| 822 | for (i = 0; i < num_rows; i++) |
||
| 823 | { |
||
| 824 | png_bytep dptr = *dp; |
||
| 825 | png_read_row(png_ptr, png_bytep_NULL, dptr); |
||
| 826 | dp++; |
||
| 827 | } |
||
| 828 | } |
||
| 829 | |||
| 830 | /* Read the entire image. If the image has an alpha channel or a tRNS |
||
| 831 | * chunk, and you have called png_handle_alpha()[*], you will need to |
||
| 832 | * initialize the image to the current image that PNG will be overlaying. |
||
| 833 | * We set the num_rows again here, in case it was incorrectly set in |
||
| 834 | * png_read_start_row() by a call to png_read_update_info() or |
||
| 835 | * png_start_read_image() if png_set_interlace_handling() wasn't called |
||
| 836 | * prior to either of these functions like it should have been. You can |
||
| 837 | * only call this function once. If you desire to have an image for |
||
| 838 | * each pass of a interlaced image, use png_read_rows() instead. |
||
| 839 | * |
||
| 840 | * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.5 |
||
| 841 | */ |
||
| 842 | void PNGAPI |
||
| 843 | png_read_image(png_structp png_ptr, png_bytepp image) |
||
| 844 | { |
||
| 845 | png_uint_32 i,image_height; |
||
| 846 | int pass, j; |
||
| 847 | png_bytepp rp; |
||
| 848 | |||
| 849 | png_debug(1, "in png_read_image\n"); |
||
| 850 | |||
| 851 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
||
| 852 | pass = png_set_interlace_handling(png_ptr); |
||
| 853 | #else |
||
| 854 | if (png_ptr->interlaced) |
||
| 855 | png_error(png_ptr, |
||
| 856 | "Cannot read interlaced image -- interlace handler disabled."); |
||
| 857 | pass = 1; |
||
| 858 | #endif |
||
| 859 | |||
| 860 | |||
| 861 | image_height=png_ptr->height; |
||
| 862 | png_ptr->num_rows = image_height; /* Make sure this is set correctly */ |
||
| 863 | |||
| 864 | for (j = 0; j < pass; j++) |
||
| 865 | { |
||
| 866 | rp = image; |
||
| 867 | for (i = 0; i < image_height; i++) |
||
| 868 | { |
||
| 869 | png_read_row(png_ptr, *rp, png_bytep_NULL); |
||
| 870 | rp++; |
||
| 871 | } |
||
| 872 | } |
||
| 873 | } |
||
| 874 | |||
| 875 | /* Read the end of the PNG file. Will not read past the end of the |
||
| 876 | * file, will verify the end is accurate, and will read any comments |
||
| 877 | * or time information at the end of the file, if info is not NULL. |
||
| 878 | */ |
||
| 879 | void PNGAPI |
||
| 880 | png_read_end(png_structp png_ptr, png_infop info_ptr) |
||
| 881 | { |
||
| 882 | png_byte chunk_length[4]; |
||
| 883 | png_uint_32 length; |
||
| 884 | |||
| 885 | png_debug(1, "in png_read_end\n"); |
||
| 886 | png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ |
||
| 887 | |||
| 888 | do |
||
| 889 | { |
||
| 890 | #ifdef PNG_USE_LOCAL_ARRAYS |
||
| 891 | PNG_IHDR; |
||
| 892 | PNG_IDAT; |
||
| 893 | PNG_IEND; |
||
| 894 | PNG_PLTE; |
||
| 895 | #if defined(PNG_READ_bKGD_SUPPORTED) |
||
| 896 | PNG_bKGD; |
||
| 897 | #endif |
||
| 898 | #if defined(PNG_READ_cHRM_SUPPORTED) |
||
| 899 | PNG_cHRM; |
||
| 900 | #endif |
||
| 901 | #if defined(PNG_READ_gAMA_SUPPORTED) |
||
| 902 | PNG_gAMA; |
||
| 903 | #endif |
||
| 904 | #if defined(PNG_READ_hIST_SUPPORTED) |
||
| 905 | PNG_hIST; |
||
| 906 | #endif |
||
| 907 | #if defined(PNG_READ_iCCP_SUPPORTED) |
||
| 908 | PNG_iCCP; |
||
| 909 | #endif |
||
| 910 | #if defined(PNG_READ_iTXt_SUPPORTED) |
||
| 911 | PNG_iTXt; |
||
| 912 | #endif |
||
| 913 | #if defined(PNG_READ_oFFs_SUPPORTED) |
||
| 914 | PNG_oFFs; |
||
| 915 | #endif |
||
| 916 | #if defined(PNG_READ_pCAL_SUPPORTED) |
||
| 917 | PNG_pCAL; |
||
| 918 | #endif |
||
| 919 | #if defined(PNG_READ_pHYs_SUPPORTED) |
||
| 920 | PNG_pHYs; |
||
| 921 | #endif |
||
| 922 | #if defined(PNG_READ_sBIT_SUPPORTED) |
||
| 923 | PNG_sBIT; |
||
| 924 | #endif |
||
| 925 | #if defined(PNG_READ_sCAL_SUPPORTED) |
||
| 926 | PNG_sCAL; |
||
| 927 | #endif |
||
| 928 | #if defined(PNG_READ_sPLT_SUPPORTED) |
||
| 929 | PNG_sPLT; |
||
| 930 | #endif |
||
| 931 | #if defined(PNG_READ_sRGB_SUPPORTED) |
||
| 932 | PNG_sRGB; |
||
| 933 | #endif |
||
| 934 | #if defined(PNG_READ_tEXt_SUPPORTED) |
||
| 935 | PNG_tEXt; |
||
| 936 | #endif |
||
| 937 | #if defined(PNG_READ_tIME_SUPPORTED) |
||
| 938 | PNG_tIME; |
||
| 939 | #endif |
||
| 940 | #if defined(PNG_READ_tRNS_SUPPORTED) |
||
| 941 | PNG_tRNS; |
||
| 942 | #endif |
||
| 943 | #if defined(PNG_READ_zTXt_SUPPORTED) |
||
| 944 | PNG_zTXt; |
||
| 945 | #endif |
||
| 946 | #endif /* PNG_GLOBAL_ARRAYS */ |
||
| 947 | |||
| 948 | png_read_data(png_ptr, chunk_length, 4); |
||
| 949 | length = png_get_uint_32(chunk_length); |
||
| 950 | |||
| 951 | png_reset_crc(png_ptr); |
||
| 952 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
||
| 953 | |||
| 954 | png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name); |
||
| 955 | |||
| 956 | if (length > PNG_MAX_UINT) |
||
| 957 | png_error(png_ptr, "Invalid chunk length."); |
||
| 958 | |||
| 959 | if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
||
| 960 | png_handle_IHDR(png_ptr, info_ptr, length); |
||
| 961 | else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
||
| 962 | png_handle_IEND(png_ptr, info_ptr, length); |
||
| 963 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
||
| 964 | else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) |
||
| 965 | { |
||
| 966 | if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
||
| 967 | { |
||
| 968 | if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT) |
||
| 969 | png_error(png_ptr, "Too many IDAT's found"); |
||
| 970 | } |
||
| 971 | else |
||
| 972 | png_ptr->mode |= PNG_AFTER_IDAT; |
||
| 973 | png_handle_unknown(png_ptr, info_ptr, length); |
||
| 974 | if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
||
| 975 | png_ptr->mode |= PNG_HAVE_PLTE; |
||
| 976 | } |
||
| 977 | #endif |
||
| 978 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
||
| 979 | { |
||
| 980 | /* Zero length IDATs are legal after the last IDAT has been |
||
| 981 | * read, but not after other chunks have been read. |
||
| 982 | */ |
||
| 983 | if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT) |
||
| 984 | png_error(png_ptr, "Too many IDAT's found"); |
||
| 985 | png_crc_finish(png_ptr, length); |
||
| 986 | } |
||
| 987 | else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
||
| 988 | png_handle_PLTE(png_ptr, info_ptr, length); |
||
| 989 | #if defined(PNG_READ_bKGD_SUPPORTED) |
||
| 990 | else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
||
| 991 | png_handle_bKGD(png_ptr, info_ptr, length); |
||
| 992 | #endif |
||
| 993 | #if defined(PNG_READ_cHRM_SUPPORTED) |
||
| 994 | else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
||
| 995 | png_handle_cHRM(png_ptr, info_ptr, length); |
||
| 996 | #endif |
||
| 997 | #if defined(PNG_READ_gAMA_SUPPORTED) |
||
| 998 | else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
||
| 999 | png_handle_gAMA(png_ptr, info_ptr, length); |
||
| 1000 | #endif |
||
| 1001 | #if defined(PNG_READ_hIST_SUPPORTED) |
||
| 1002 | else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
||
| 1003 | png_handle_hIST(png_ptr, info_ptr, length); |
||
| 1004 | #endif |
||
| 1005 | #if defined(PNG_READ_oFFs_SUPPORTED) |
||
| 1006 | else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
||
| 1007 | png_handle_oFFs(png_ptr, info_ptr, length); |
||
| 1008 | #endif |
||
| 1009 | #if defined(PNG_READ_pCAL_SUPPORTED) |
||
| 1010 | else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
||
| 1011 | png_handle_pCAL(png_ptr, info_ptr, length); |
||
| 1012 | #endif |
||
| 1013 | #if defined(PNG_READ_sCAL_SUPPORTED) |
||
| 1014 | else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) |
||
| 1015 | png_handle_sCAL(png_ptr, info_ptr, length); |
||
| 1016 | #endif |
||
| 1017 | #if defined(PNG_READ_pHYs_SUPPORTED) |
||
| 1018 | else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
||
| 1019 | png_handle_pHYs(png_ptr, info_ptr, length); |
||
| 1020 | #endif |
||
| 1021 | #if defined(PNG_READ_sBIT_SUPPORTED) |
||
| 1022 | else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
||
| 1023 | png_handle_sBIT(png_ptr, info_ptr, length); |
||
| 1024 | #endif |
||
| 1025 | #if defined(PNG_READ_sRGB_SUPPORTED) |
||
| 1026 | else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
||
| 1027 | png_handle_sRGB(png_ptr, info_ptr, length); |
||
| 1028 | #endif |
||
| 1029 | #if defined(PNG_READ_iCCP_SUPPORTED) |
||
| 1030 | else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) |
||
| 1031 | png_handle_iCCP(png_ptr, info_ptr, length); |
||
| 1032 | #endif |
||
| 1033 | #if defined(PNG_READ_sPLT_SUPPORTED) |
||
| 1034 | else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) |
||
| 1035 | png_handle_sPLT(png_ptr, info_ptr, length); |
||
| 1036 | #endif |
||
| 1037 | #if defined(PNG_READ_tEXt_SUPPORTED) |
||
| 1038 | else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
||
| 1039 | png_handle_tEXt(png_ptr, info_ptr, length); |
||
| 1040 | #endif |
||
| 1041 | #if defined(PNG_READ_tIME_SUPPORTED) |
||
| 1042 | else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
||
| 1043 | png_handle_tIME(png_ptr, info_ptr, length); |
||
| 1044 | #endif |
||
| 1045 | #if defined(PNG_READ_tRNS_SUPPORTED) |
||
| 1046 | else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
||
| 1047 | png_handle_tRNS(png_ptr, info_ptr, length); |
||
| 1048 | #endif |
||
| 1049 | #if defined(PNG_READ_zTXt_SUPPORTED) |
||
| 1050 | else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
||
| 1051 | png_handle_zTXt(png_ptr, info_ptr, length); |
||
| 1052 | #endif |
||
| 1053 | #if defined(PNG_READ_iTXt_SUPPORTED) |
||
| 1054 | else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) |
||
| 1055 | png_handle_iTXt(png_ptr, info_ptr, length); |
||
| 1056 | #endif |
||
| 1057 | else |
||
| 1058 | png_handle_unknown(png_ptr, info_ptr, length); |
||
| 1059 | } while (!(png_ptr->mode & PNG_HAVE_IEND)); |
||
| 1060 | } |
||
| 1061 | |||
| 1062 | /* free all memory used by the read */ |
||
| 1063 | void PNGAPI |
||
| 1064 | png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, |
||
| 1065 | png_infopp end_info_ptr_ptr) |
||
| 1066 | { |
||
| 1067 | png_structp png_ptr = NULL; |
||
| 1068 | png_infop info_ptr = NULL, end_info_ptr = NULL; |
||
| 1069 | #ifdef PNG_USER_MEM_SUPPORTED |
||
| 1070 | png_free_ptr free_fn = NULL; |
||
| 1071 | png_voidp mem_ptr = NULL; |
||
| 1072 | #endif |
||
| 1073 | |||
| 1074 | png_debug(1, "in png_destroy_read_struct\n"); |
||
| 1075 | if (png_ptr_ptr != NULL) |
||
| 1076 | png_ptr = *png_ptr_ptr; |
||
| 1077 | |||
| 1078 | if (info_ptr_ptr != NULL) |
||
| 1079 | info_ptr = *info_ptr_ptr; |
||
| 1080 | |||
| 1081 | if (end_info_ptr_ptr != NULL) |
||
| 1082 | end_info_ptr = *end_info_ptr_ptr; |
||
| 1083 | |||
| 1084 | #ifdef PNG_USER_MEM_SUPPORTED |
||
| 1085 | free_fn = png_ptr->free_fn; |
||
| 1086 | mem_ptr = png_ptr->mem_ptr; |
||
| 1087 | #endif |
||
| 1088 | |||
| 1089 | png_read_destroy(png_ptr, info_ptr, end_info_ptr); |
||
| 1090 | |||
| 1091 | if (info_ptr != NULL) |
||
| 1092 | { |
||
| 1093 | #if defined(PNG_TEXT_SUPPORTED) |
||
| 1094 | png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); |
||
| 1095 | #endif |
||
| 1096 | |||
| 1097 | #ifdef PNG_USER_MEM_SUPPORTED |
||
| 1098 | png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, |
||
| 1099 | (png_voidp)mem_ptr); |
||
| 1100 | #else |
||
| 1101 | png_destroy_struct((png_voidp)info_ptr); |
||
| 1102 | #endif |
||
| 1103 | *info_ptr_ptr = NULL; |
||
| 1104 | } |
||
| 1105 | |||
| 1106 | if (end_info_ptr != NULL) |
||
| 1107 | { |
||
| 1108 | #if defined(PNG_READ_TEXT_SUPPORTED) |
||
| 1109 | png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); |
||
| 1110 | #endif |
||
| 1111 | #ifdef PNG_USER_MEM_SUPPORTED |
||
| 1112 | png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, |
||
| 1113 | (png_voidp)mem_ptr); |
||
| 1114 | #else |
||
| 1115 | png_destroy_struct((png_voidp)end_info_ptr); |
||
| 1116 | #endif |
||
| 1117 | *end_info_ptr_ptr = NULL; |
||
| 1118 | } |
||
| 1119 | |||
| 1120 | if (png_ptr != NULL) |
||
| 1121 | { |
||
| 1122 | #ifdef PNG_USER_MEM_SUPPORTED |
||
| 1123 | png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, |
||
| 1124 | (png_voidp)mem_ptr); |
||
| 1125 | #else |
||
| 1126 | png_destroy_struct((png_voidp)png_ptr); |
||
| 1127 | #endif |
||
| 1128 | *png_ptr_ptr = NULL; |
||
| 1129 | } |
||
| 1130 | } |
||
| 1131 | |||
| 1132 | /* free all memory used by the read (old method) */ |
||
| 1133 | void /* PRIVATE */ |
||
| 1134 | png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr) |
||
| 1135 | { |
||
| 1136 | #ifdef PNG_SETJMP_SUPPORTED |
||
| 1137 | jmp_buf tmp_jmp; |
||
| 1138 | #endif |
||
| 1139 | png_error_ptr error_fn; |
||
| 1140 | png_error_ptr warning_fn; |
||
| 1141 | png_voidp error_ptr; |
||
| 1142 | #ifdef PNG_USER_MEM_SUPPORTED |
||
| 1143 | png_free_ptr free_fn; |
||
| 1144 | #endif |
||
| 1145 | |||
| 1146 | png_debug(1, "in png_read_destroy\n"); |
||
| 1147 | if (info_ptr != NULL) |
||
| 1148 | png_info_destroy(png_ptr, info_ptr); |
||
| 1149 | |||
| 1150 | if (end_info_ptr != NULL) |
||
| 1151 | png_info_destroy(png_ptr, end_info_ptr); |
||
| 1152 | |||
| 1153 | png_free(png_ptr, png_ptr->zbuf); |
||
| 1154 | png_free(png_ptr, png_ptr->big_row_buf); |
||
| 1155 | png_free(png_ptr, png_ptr->prev_row); |
||
| 1156 | #if defined(PNG_READ_DITHER_SUPPORTED) |
||
| 1157 | png_free(png_ptr, png_ptr->palette_lookup); |
||
| 1158 | png_free(png_ptr, png_ptr->dither_index); |
||
| 1159 | #endif |
||
| 1160 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
||
| 1161 | png_free(png_ptr, png_ptr->gamma_table); |
||
| 1162 | #endif |
||
| 1163 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
||
| 1164 | png_free(png_ptr, png_ptr->gamma_from_1); |
||
| 1165 | png_free(png_ptr, png_ptr->gamma_to_1); |
||
| 1166 | #endif |
||
| 1167 | #ifdef PNG_FREE_ME_SUPPORTED |
||
| 1168 | if (png_ptr->free_me & PNG_FREE_PLTE) |
||
| 1169 | png_zfree(png_ptr, png_ptr->palette); |
||
| 1170 | png_ptr->free_me &= ~PNG_FREE_PLTE; |
||
| 1171 | #else |
||
| 1172 | if (png_ptr->flags & PNG_FLAG_FREE_PLTE) |
||
| 1173 | png_zfree(png_ptr, png_ptr->palette); |
||
| 1174 | png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; |
||
| 1175 | #endif |
||
| 1176 | #if defined(PNG_tRNS_SUPPORTED) || \ |
||
| 1177 | defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
||
| 1178 | #ifdef PNG_FREE_ME_SUPPORTED |
||
| 1179 | if (png_ptr->free_me & PNG_FREE_TRNS) |
||
| 1180 | png_free(png_ptr, png_ptr->trans); |
||
| 1181 | png_ptr->free_me &= ~PNG_FREE_TRNS; |
||
| 1182 | #else |
||
| 1183 | if (png_ptr->flags & PNG_FLAG_FREE_TRNS) |
||
| 1184 | png_free(png_ptr, png_ptr->trans); |
||
| 1185 | png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; |
||
| 1186 | #endif |
||
| 1187 | #endif |
||
| 1188 | #if defined(PNG_READ_hIST_SUPPORTED) |
||
| 1189 | #ifdef PNG_FREE_ME_SUPPORTED |
||
| 1190 | if (png_ptr->free_me & PNG_FREE_HIST) |
||
| 1191 | png_free(png_ptr, png_ptr->hist); |
||
| 1192 | png_ptr->free_me &= ~PNG_FREE_HIST; |
||
| 1193 | #else |
||
| 1194 | if (png_ptr->flags & PNG_FLAG_FREE_HIST) |
||
| 1195 | png_free(png_ptr, png_ptr->hist); |
||
| 1196 | png_ptr->flags &= ~PNG_FLAG_FREE_HIST; |
||
| 1197 | #endif |
||
| 1198 | #endif |
||
| 1199 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
||
| 1200 | if (png_ptr->gamma_16_table != NULL) |
||
| 1201 | { |
||
| 1202 | int i; |
||
| 1203 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
||
| 1204 | for (i = 0; i < istop; i++) |
||
| 1205 | { |
||
| 1206 | png_free(png_ptr, png_ptr->gamma_16_table[i]); |
||
| 1207 | } |
||
| 1208 | png_free(png_ptr, png_ptr->gamma_16_table); |
||
| 1209 | } |
||
| 1210 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
||
| 1211 | if (png_ptr->gamma_16_from_1 != NULL) |
||
| 1212 | { |
||
| 1213 | int i; |
||
| 1214 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
||
| 1215 | for (i = 0; i < istop; i++) |
||
| 1216 | { |
||
| 1217 | png_free(png_ptr, png_ptr->gamma_16_from_1[i]); |
||
| 1218 | } |
||
| 1219 | png_free(png_ptr, png_ptr->gamma_16_from_1); |
||
| 1220 | } |
||
| 1221 | if (png_ptr->gamma_16_to_1 != NULL) |
||
| 1222 | { |
||
| 1223 | int i; |
||
| 1224 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
||
| 1225 | for (i = 0; i < istop; i++) |
||
| 1226 | { |
||
| 1227 | png_free(png_ptr, png_ptr->gamma_16_to_1[i]); |
||
| 1228 | } |
||
| 1229 | png_free(png_ptr, png_ptr->gamma_16_to_1); |
||
| 1230 | } |
||
| 1231 | #endif |
||
| 1232 | #endif |
||
| 1233 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
||
| 1234 | png_free(png_ptr, png_ptr->time_buffer); |
||
| 1235 | #endif |
||
| 1236 | |||
| 1237 | inflateEnd(&png_ptr->zstream); |
||
| 1238 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
||
| 1239 | png_free(png_ptr, png_ptr->save_buffer); |
||
| 1240 | #endif |
||
| 1241 | |||
| 1242 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
||
| 1243 | #ifdef PNG_TEXT_SUPPORTED |
||
| 1244 | png_free(png_ptr, png_ptr->current_text); |
||
| 1245 | #endif /* PNG_TEXT_SUPPORTED */ |
||
| 1246 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
||
| 1247 | |||
| 1248 | /* Save the important info out of the png_struct, in case it is |
||
| 1249 | * being used again. |
||
| 1250 | */ |
||
| 1251 | #ifdef PNG_SETJMP_SUPPORTED |
||
| 1252 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); |
||
| 1253 | #endif |
||
| 1254 | |||
| 1255 | error_fn = png_ptr->error_fn; |
||
| 1256 | warning_fn = png_ptr->warning_fn; |
||
| 1257 | error_ptr = png_ptr->error_ptr; |
||
| 1258 | #ifdef PNG_USER_MEM_SUPPORTED |
||
| 1259 | free_fn = png_ptr->free_fn; |
||
| 1260 | #endif |
||
| 1261 | |||
| 1262 | png_memset(png_ptr, 0, sizeof (png_struct)); |
||
| 1263 | |||
| 1264 | png_ptr->error_fn = error_fn; |
||
| 1265 | png_ptr->warning_fn = warning_fn; |
||
| 1266 | png_ptr->error_ptr = error_ptr; |
||
| 1267 | #ifdef PNG_USER_MEM_SUPPORTED |
||
| 1268 | png_ptr->free_fn = free_fn; |
||
| 1269 | #endif |
||
| 1270 | |||
| 1271 | #ifdef PNG_SETJMP_SUPPORTED |
||
| 1272 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); |
||
| 1273 | #endif |
||
| 1274 | |||
| 1275 | } |
||
| 1276 | |||
| 1277 | void PNGAPI |
||
| 1278 | png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) |
||
| 1279 | { |
||
| 1280 | png_ptr->read_row_fn = read_row_fn; |
||
| 1281 | } |
||
| 1282 | |||
| 1283 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
||
| 1284 | void PNGAPI |
||
| 1285 | png_read_png(png_structp png_ptr, png_infop info_ptr, |
||
| 1286 | int transforms, |
||
| 1287 | voidp params) |
||
| 1288 | { |
||
| 1289 | int row; |
||
| 1290 | |||
| 1291 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) |
||
| 1292 | /* invert the alpha channel from opacity to transparency */ |
||
| 1293 | if (transforms & PNG_TRANSFORM_INVERT_ALPHA) |
||
| 1294 | png_set_invert_alpha(png_ptr); |
||
| 1295 | #endif |
||
| 1296 | |||
| 1297 | /* The call to png_read_info() gives us all of the information from the |
||
| 1298 | * PNG file before the first IDAT (image data chunk). |
||
| 1299 | */ |
||
| 1300 | png_read_info(png_ptr, info_ptr); |
||
| 1301 | |||
| 1302 | /* -------------- image transformations start here ------------------- */ |
||
| 1303 | |||
| 1304 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
||
| 1305 | /* tell libpng to strip 16 bit/color files down to 8 bits/color */ |
||
| 1306 | if (transforms & PNG_TRANSFORM_STRIP_16) |
||
| 1307 | png_set_strip_16(png_ptr); |
||
| 1308 | #endif |
||
| 1309 | |||
| 1310 | #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
||
| 1311 | /* Strip alpha bytes from the input data without combining with the |
||
| 1312 | * background (not recommended). |
||
| 1313 | */ |
||
| 1314 | if (transforms & PNG_TRANSFORM_STRIP_ALPHA) |
||
| 1315 | png_set_strip_alpha(png_ptr); |
||
| 1316 | #endif |
||
| 1317 | |||
| 1318 | #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) |
||
| 1319 | /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single |
||
| 1320 | * byte into separate bytes (useful for paletted and grayscale images). |
||
| 1321 | */ |
||
| 1322 | if (transforms & PNG_TRANSFORM_PACKING) |
||
| 1323 | png_set_packing(png_ptr); |
||
| 1324 | #endif |
||
| 1325 | |||
| 1326 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) |
||
| 1327 | /* Change the order of packed pixels to least significant bit first |
||
| 1328 | * (not useful if you are using png_set_packing). */ |
||
| 1329 | if (transforms & PNG_TRANSFORM_PACKSWAP) |
||
| 1330 | png_set_packswap(png_ptr); |
||
| 1331 | #endif |
||
| 1332 | |||
| 1333 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
||
| 1334 | /* Expand paletted colors into true RGB triplets |
||
| 1335 | * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel |
||
| 1336 | * Expand paletted or RGB images with transparency to full alpha |
||
| 1337 | * channels so the data will be available as RGBA quartets. |
||
| 1338 | */ |
||
| 1339 | if (transforms & PNG_TRANSFORM_EXPAND) |
||
| 1340 | if ((png_ptr->bit_depth < 8) || |
||
| 1341 | (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || |
||
| 1342 | (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) |
||
| 1343 | png_set_expand(png_ptr); |
||
| 1344 | #endif |
||
| 1345 | |||
| 1346 | /* We don't handle background color or gamma transformation or dithering. */ |
||
| 1347 | |||
| 1348 | #if defined(PNG_READ_INVERT_SUPPORTED) |
||
| 1349 | /* invert monochrome files to have 0 as white and 1 as black */ |
||
| 1350 | if (transforms & PNG_TRANSFORM_INVERT_MONO) |
||
| 1351 | png_set_invert_mono(png_ptr); |
||
| 1352 | #endif |
||
| 1353 | |||
| 1354 | #if defined(PNG_READ_SHIFT_SUPPORTED) |
||
| 1355 | /* If you want to shift the pixel values from the range [0,255] or |
||
| 1356 | * [0,65535] to the original [0,7] or [0,31], or whatever range the |
||
| 1357 | * colors were originally in: |
||
| 1358 | */ |
||
| 1359 | if ((transforms & PNG_TRANSFORM_SHIFT) |
||
| 1360 | && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT)) |
||
| 1361 | { |
||
| 1362 | png_color_8p sig_bit; |
||
| 1363 | |||
| 1364 | png_get_sBIT(png_ptr, info_ptr, &sig_bit); |
||
| 1365 | png_set_shift(png_ptr, sig_bit); |
||
| 1366 | } |
||
| 1367 | #endif |
||
| 1368 | |||
| 1369 | #if defined(PNG_READ_BGR_SUPPORTED) |
||
| 1370 | /* flip the RGB pixels to BGR (or RGBA to BGRA) */ |
||
| 1371 | if (transforms & PNG_TRANSFORM_BGR) |
||
| 1372 | png_set_bgr(png_ptr); |
||
| 1373 | #endif |
||
| 1374 | |||
| 1375 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
||
| 1376 | /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */ |
||
| 1377 | if (transforms & PNG_TRANSFORM_SWAP_ALPHA) |
||
| 1378 | png_set_swap_alpha(png_ptr); |
||
| 1379 | #endif |
||
| 1380 | |||
| 1381 | #if defined(PNG_READ_SWAP_SUPPORTED) |
||
| 1382 | /* swap bytes of 16 bit files to least significant byte first */ |
||
| 1383 | if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) |
||
| 1384 | png_set_swap(png_ptr); |
||
| 1385 | #endif |
||
| 1386 | |||
| 1387 | /* We don't handle adding filler bytes */ |
||
| 1388 | |||
| 1389 | /* Optional call to gamma correct and add the background to the palette |
||
| 1390 | * and update info structure. REQUIRED if you are expecting libpng to |
||
| 1391 | * update the palette for you (i.e., you selected such a transform above). |
||
| 1392 | */ |
||
| 1393 | png_read_update_info(png_ptr, info_ptr); |
||
| 1394 | |||
| 1395 | /* -------------- image transformations end here ------------------- */ |
||
| 1396 | |||
| 1397 | #ifdef PNG_FREE_ME_SUPPORTED |
||
| 1398 | png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); |
||
| 1399 | #endif |
||
| 1400 | if(info_ptr->row_pointers == NULL) |
||
| 1401 | { |
||
| 1402 | info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, |
||
| 1403 | info_ptr->height * sizeof(png_bytep)); |
||
| 1404 | #ifdef PNG_FREE_ME_SUPPORTED |
||
| 1405 | info_ptr->free_me |= PNG_FREE_ROWS; |
||
| 1406 | #endif |
||
| 1407 | for (row = 0; row < (int)info_ptr->height; row++) |
||
| 1408 | { |
||
| 1409 | info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, |
||
| 1410 | png_get_rowbytes(png_ptr, info_ptr)); |
||
| 1411 | } |
||
| 1412 | } |
||
| 1413 | |||
| 1414 | png_read_image(png_ptr, info_ptr->row_pointers); |
||
| 1415 | info_ptr->valid |= PNG_INFO_IDAT; |
||
| 1416 | |||
| 1417 | /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ |
||
| 1418 | png_read_end(png_ptr, info_ptr); |
||
| 1419 | |||
| 1420 | if(transforms == 0 || params == NULL) |
||
| 1421 | /* quiet compiler warnings */ return; |
||
| 1422 | |||
| 1423 | } |
||
| 1424 | #endif |