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annotate libs/libpng/pngerror.c @ 14:06dc8b9b4f89

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added libimago, libjpeg and libpng
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 07 Jun 2015 17:25:49 +0300
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nuclear@14 1
nuclear@14 2 /* pngerror.c - stub functions for i/o and memory allocation
nuclear@14 3 *
nuclear@14 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@14 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@14 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@14 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@14 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@14 9 *
nuclear@14 10 * This file provides a location for all error handling. Users who
nuclear@14 11 * need special error handling are expected to write replacement functions
nuclear@14 12 * and use png_set_error_fn() to use those functions. See the instructions
nuclear@14 13 * at each function.
nuclear@14 14 */
nuclear@14 15
nuclear@14 16 #define PNG_INTERNAL
nuclear@14 17 #include "png.h"
nuclear@14 18 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@14 19
nuclear@14 20 static void /* PRIVATE */
nuclear@14 21 png_default_error PNGARG((png_structp png_ptr,
nuclear@14 22 png_const_charp error_message));
nuclear@14 23 #ifndef PNG_NO_WARNINGS
nuclear@14 24 static void /* PRIVATE */
nuclear@14 25 png_default_warning PNGARG((png_structp png_ptr,
nuclear@14 26 png_const_charp warning_message));
nuclear@14 27 #endif /* PNG_NO_WARNINGS */
nuclear@14 28
nuclear@14 29 /* This function is called whenever there is a fatal error. This function
nuclear@14 30 * should not be changed. If there is a need to handle errors differently,
nuclear@14 31 * you should supply a replacement error function and use png_set_error_fn()
nuclear@14 32 * to replace the error function at run-time.
nuclear@14 33 */
nuclear@14 34 #ifndef PNG_NO_ERROR_TEXT
nuclear@14 35 void PNGAPI
nuclear@14 36 png_error(png_structp png_ptr, png_const_charp error_message)
nuclear@14 37 {
nuclear@14 38 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14 39 char msg[16];
nuclear@14 40 if (png_ptr != NULL)
nuclear@14 41 {
nuclear@14 42 if (png_ptr->flags&
nuclear@14 43 (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
nuclear@14 44 {
nuclear@14 45 if (*error_message == '#')
nuclear@14 46 {
nuclear@14 47 /* Strip "#nnnn " from beginning of error message. */
nuclear@14 48 int offset;
nuclear@14 49 for (offset = 1; offset<15; offset++)
nuclear@14 50 if (error_message[offset] == ' ')
nuclear@14 51 break;
nuclear@14 52 if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
nuclear@14 53 {
nuclear@14 54 int i;
nuclear@14 55 for (i = 0; i < offset - 1; i++)
nuclear@14 56 msg[i] = error_message[i + 1];
nuclear@14 57 msg[i - 1] = '\0';
nuclear@14 58 error_message = msg;
nuclear@14 59 }
nuclear@14 60 else
nuclear@14 61 error_message += offset;
nuclear@14 62 }
nuclear@14 63 else
nuclear@14 64 {
nuclear@14 65 if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
nuclear@14 66 {
nuclear@14 67 msg[0] = '0';
nuclear@14 68 msg[1] = '\0';
nuclear@14 69 error_message = msg;
nuclear@14 70 }
nuclear@14 71 }
nuclear@14 72 }
nuclear@14 73 }
nuclear@14 74 #endif
nuclear@14 75 if (png_ptr != NULL && png_ptr->error_fn != NULL)
nuclear@14 76 (*(png_ptr->error_fn))(png_ptr, error_message);
nuclear@14 77
nuclear@14 78 /* If the custom handler doesn't exist, or if it returns,
nuclear@14 79 use the default handler, which will not return. */
nuclear@14 80 png_default_error(png_ptr, error_message);
nuclear@14 81 }
nuclear@14 82 #else
nuclear@14 83 void PNGAPI
nuclear@14 84 png_err(png_structp png_ptr)
nuclear@14 85 {
nuclear@14 86 if (png_ptr != NULL && png_ptr->error_fn != NULL)
nuclear@14 87 (*(png_ptr->error_fn))(png_ptr, '\0');
nuclear@14 88
nuclear@14 89 /* If the custom handler doesn't exist, or if it returns,
nuclear@14 90 use the default handler, which will not return. */
nuclear@14 91 png_default_error(png_ptr, '\0');
nuclear@14 92 }
nuclear@14 93 #endif /* PNG_NO_ERROR_TEXT */
nuclear@14 94
nuclear@14 95 #ifndef PNG_NO_WARNINGS
nuclear@14 96 /* This function is called whenever there is a non-fatal error. This function
nuclear@14 97 * should not be changed. If there is a need to handle warnings differently,
nuclear@14 98 * you should supply a replacement warning function and use
nuclear@14 99 * png_set_error_fn() to replace the warning function at run-time.
nuclear@14 100 */
nuclear@14 101 void PNGAPI
nuclear@14 102 png_warning(png_structp png_ptr, png_const_charp warning_message)
nuclear@14 103 {
nuclear@14 104 int offset = 0;
nuclear@14 105 if (png_ptr != NULL)
nuclear@14 106 {
nuclear@14 107 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14 108 if (png_ptr->flags&
nuclear@14 109 (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
nuclear@14 110 #endif
nuclear@14 111 {
nuclear@14 112 if (*warning_message == '#')
nuclear@14 113 {
nuclear@14 114 for (offset = 1; offset < 15; offset++)
nuclear@14 115 if (warning_message[offset] == ' ')
nuclear@14 116 break;
nuclear@14 117 }
nuclear@14 118 }
nuclear@14 119 if (png_ptr != NULL && png_ptr->warning_fn != NULL)
nuclear@14 120 (*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
nuclear@14 121 }
nuclear@14 122 else
nuclear@14 123 png_default_warning(png_ptr, warning_message + offset);
nuclear@14 124 }
nuclear@14 125 #endif /* PNG_NO_WARNINGS */
nuclear@14 126
nuclear@14 127
nuclear@14 128 /* These utilities are used internally to build an error message that relates
nuclear@14 129 * to the current chunk. The chunk name comes from png_ptr->chunk_name,
nuclear@14 130 * this is used to prefix the message. The message is limited in length
nuclear@14 131 * to 63 bytes, the name characters are output as hex digits wrapped in []
nuclear@14 132 * if the character is invalid.
nuclear@14 133 */
nuclear@14 134 #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
nuclear@14 135 static PNG_CONST char png_digit[16] = {
nuclear@14 136 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
nuclear@14 137 'A', 'B', 'C', 'D', 'E', 'F'
nuclear@14 138 };
nuclear@14 139
nuclear@14 140 #define PNG_MAX_ERROR_TEXT 64
nuclear@14 141
nuclear@14 142 #if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT)
nuclear@14 143 static void /* PRIVATE */
nuclear@14 144 png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
nuclear@14 145 error_message)
nuclear@14 146 {
nuclear@14 147 int iout = 0, iin = 0;
nuclear@14 148
nuclear@14 149 while (iin < 4)
nuclear@14 150 {
nuclear@14 151 int c = png_ptr->chunk_name[iin++];
nuclear@14 152 if (isnonalpha(c))
nuclear@14 153 {
nuclear@14 154 buffer[iout++] = '[';
nuclear@14 155 buffer[iout++] = png_digit[(c & 0xf0) >> 4];
nuclear@14 156 buffer[iout++] = png_digit[c & 0x0f];
nuclear@14 157 buffer[iout++] = ']';
nuclear@14 158 }
nuclear@14 159 else
nuclear@14 160 {
nuclear@14 161 buffer[iout++] = (png_byte)c;
nuclear@14 162 }
nuclear@14 163 }
nuclear@14 164
nuclear@14 165 if (error_message == NULL)
nuclear@14 166 buffer[iout] = '\0';
nuclear@14 167 else
nuclear@14 168 {
nuclear@14 169 buffer[iout++] = ':';
nuclear@14 170 buffer[iout++] = ' ';
nuclear@14 171 png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
nuclear@14 172 buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
nuclear@14 173 }
nuclear@14 174 }
nuclear@14 175
nuclear@14 176 #ifdef PNG_READ_SUPPORTED
nuclear@14 177 void PNGAPI
nuclear@14 178 png_chunk_error(png_structp png_ptr, png_const_charp error_message)
nuclear@14 179 {
nuclear@14 180 char msg[18+PNG_MAX_ERROR_TEXT];
nuclear@14 181 if (png_ptr == NULL)
nuclear@14 182 png_error(png_ptr, error_message);
nuclear@14 183 else
nuclear@14 184 {
nuclear@14 185 png_format_buffer(png_ptr, msg, error_message);
nuclear@14 186 png_error(png_ptr, msg);
nuclear@14 187 }
nuclear@14 188 }
nuclear@14 189 #endif /* PNG_READ_SUPPORTED */
nuclear@14 190 #endif /* !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) */
nuclear@14 191
nuclear@14 192 #ifndef PNG_NO_WARNINGS
nuclear@14 193 void PNGAPI
nuclear@14 194 png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
nuclear@14 195 {
nuclear@14 196 char msg[18+PNG_MAX_ERROR_TEXT];
nuclear@14 197 if (png_ptr == NULL)
nuclear@14 198 png_warning(png_ptr, warning_message);
nuclear@14 199 else
nuclear@14 200 {
nuclear@14 201 png_format_buffer(png_ptr, msg, warning_message);
nuclear@14 202 png_warning(png_ptr, msg);
nuclear@14 203 }
nuclear@14 204 }
nuclear@14 205 #endif /* PNG_NO_WARNINGS */
nuclear@14 206
nuclear@14 207
nuclear@14 208 /* This is the default error handling function. Note that replacements for
nuclear@14 209 * this function MUST NOT RETURN, or the program will likely crash. This
nuclear@14 210 * function is used by default, or if the program supplies NULL for the
nuclear@14 211 * error function pointer in png_set_error_fn().
nuclear@14 212 */
nuclear@14 213 static void /* PRIVATE */
nuclear@14 214 png_default_error(png_structp png_ptr, png_const_charp error_message)
nuclear@14 215 {
nuclear@14 216 #ifndef PNG_NO_CONSOLE_IO
nuclear@14 217 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14 218 if (*error_message == '#')
nuclear@14 219 {
nuclear@14 220 /* Strip "#nnnn " from beginning of warning message. */
nuclear@14 221 int offset;
nuclear@14 222 char error_number[16];
nuclear@14 223 for (offset = 0; offset<15; offset++)
nuclear@14 224 {
nuclear@14 225 error_number[offset] = error_message[offset + 1];
nuclear@14 226 if (error_message[offset] == ' ')
nuclear@14 227 break;
nuclear@14 228 }
nuclear@14 229 if ((offset > 1) && (offset < 15))
nuclear@14 230 {
nuclear@14 231 error_number[offset - 1] = '\0';
nuclear@14 232 fprintf(stderr, "libpng error no. %s: %s\n", error_number,
nuclear@14 233 error_message + offset + 1);
nuclear@14 234 }
nuclear@14 235 else
nuclear@14 236 fprintf(stderr, "libpng error: %s, offset=%d\n", error_message, offset);
nuclear@14 237 }
nuclear@14 238 else
nuclear@14 239 #endif
nuclear@14 240 fprintf(stderr, "libpng error: %s\n", error_message);
nuclear@14 241 #endif
nuclear@14 242
nuclear@14 243 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 244 if (png_ptr)
nuclear@14 245 {
nuclear@14 246 # ifdef USE_FAR_KEYWORD
nuclear@14 247 {
nuclear@14 248 jmp_buf jmpbuf;
nuclear@14 249 png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@14 250 longjmp(jmpbuf, 1);
nuclear@14 251 }
nuclear@14 252 # else
nuclear@14 253 longjmp(png_ptr->jmpbuf, 1);
nuclear@14 254 # endif
nuclear@14 255 }
nuclear@14 256 #else
nuclear@14 257 PNG_ABORT();
nuclear@14 258 #endif
nuclear@14 259 #ifdef PNG_NO_CONSOLE_IO
nuclear@14 260 error_message = error_message; /* make compiler happy */
nuclear@14 261 #endif
nuclear@14 262 }
nuclear@14 263
nuclear@14 264 #ifndef PNG_NO_WARNINGS
nuclear@14 265 /* This function is called when there is a warning, but the library thinks
nuclear@14 266 * it can continue anyway. Replacement functions don't have to do anything
nuclear@14 267 * here if you don't want them to. In the default configuration, png_ptr is
nuclear@14 268 * not used, but it is passed in case it may be useful.
nuclear@14 269 */
nuclear@14 270 static void /* PRIVATE */
nuclear@14 271 png_default_warning(png_structp png_ptr, png_const_charp warning_message)
nuclear@14 272 {
nuclear@14 273 #ifndef PNG_NO_CONSOLE_IO
nuclear@14 274 # ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14 275 if (*warning_message == '#')
nuclear@14 276 {
nuclear@14 277 int offset;
nuclear@14 278 char warning_number[16];
nuclear@14 279 for (offset = 0; offset < 15; offset++)
nuclear@14 280 {
nuclear@14 281 warning_number[offset] = warning_message[offset + 1];
nuclear@14 282 if (warning_message[offset] == ' ')
nuclear@14 283 break;
nuclear@14 284 }
nuclear@14 285 if ((offset > 1) && (offset < 15))
nuclear@14 286 {
nuclear@14 287 warning_number[offset + 1] = '\0';
nuclear@14 288 fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
nuclear@14 289 warning_message + offset);
nuclear@14 290 }
nuclear@14 291 else
nuclear@14 292 fprintf(stderr, "libpng warning: %s\n", warning_message);
nuclear@14 293 }
nuclear@14 294 else
nuclear@14 295 # endif
nuclear@14 296 fprintf(stderr, "libpng warning: %s\n", warning_message);
nuclear@14 297 #else
nuclear@14 298 warning_message = warning_message; /* make compiler happy */
nuclear@14 299 #endif
nuclear@14 300 png_ptr = png_ptr; /* make compiler happy */
nuclear@14 301 }
nuclear@14 302 #endif /* PNG_NO_WARNINGS */
nuclear@14 303
nuclear@14 304 /* This function is called when the application wants to use another method
nuclear@14 305 * of handling errors and warnings. Note that the error function MUST NOT
nuclear@14 306 * return to the calling routine or serious problems will occur. The return
nuclear@14 307 * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
nuclear@14 308 */
nuclear@14 309 void PNGAPI
nuclear@14 310 png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
nuclear@14 311 png_error_ptr error_fn, png_error_ptr warning_fn)
nuclear@14 312 {
nuclear@14 313 if (png_ptr == NULL)
nuclear@14 314 return;
nuclear@14 315 png_ptr->error_ptr = error_ptr;
nuclear@14 316 png_ptr->error_fn = error_fn;
nuclear@14 317 png_ptr->warning_fn = warning_fn;
nuclear@14 318 }
nuclear@14 319
nuclear@14 320
nuclear@14 321 /* This function returns a pointer to the error_ptr associated with the user
nuclear@14 322 * functions. The application should free any memory associated with this
nuclear@14 323 * pointer before png_write_destroy and png_read_destroy are called.
nuclear@14 324 */
nuclear@14 325 png_voidp PNGAPI
nuclear@14 326 png_get_error_ptr(png_structp png_ptr)
nuclear@14 327 {
nuclear@14 328 if (png_ptr == NULL)
nuclear@14 329 return NULL;
nuclear@14 330 return ((png_voidp)png_ptr->error_ptr);
nuclear@14 331 }
nuclear@14 332
nuclear@14 333
nuclear@14 334 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14 335 void PNGAPI
nuclear@14 336 png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
nuclear@14 337 {
nuclear@14 338 if (png_ptr != NULL)
nuclear@14 339 {
nuclear@14 340 png_ptr->flags &=
nuclear@14 341 ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
nuclear@14 342 }
nuclear@14 343 }
nuclear@14 344 #endif
nuclear@14 345 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */