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annotate libs/libpng/pngerror.c @ 2:334d17aed7de

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 18:36:38 +0200
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nuclear@0 1
nuclear@0 2 /* pngerror.c - stub functions for i/o and memory allocation
nuclear@0 3 *
nuclear@0 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@0 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@0 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@0 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@0 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@0 9 *
nuclear@0 10 * This file provides a location for all error handling. Users who
nuclear@0 11 * need special error handling are expected to write replacement functions
nuclear@0 12 * and use png_set_error_fn() to use those functions. See the instructions
nuclear@0 13 * at each function.
nuclear@0 14 */
nuclear@0 15
nuclear@0 16 #define PNG_INTERNAL
nuclear@0 17 #include "png.h"
nuclear@0 18 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@0 19
nuclear@0 20 static void /* PRIVATE */
nuclear@0 21 png_default_error PNGARG((png_structp png_ptr,
nuclear@0 22 png_const_charp error_message));
nuclear@0 23 #ifndef PNG_NO_WARNINGS
nuclear@0 24 static void /* PRIVATE */
nuclear@0 25 png_default_warning PNGARG((png_structp png_ptr,
nuclear@0 26 png_const_charp warning_message));
nuclear@0 27 #endif /* PNG_NO_WARNINGS */
nuclear@0 28
nuclear@0 29 /* This function is called whenever there is a fatal error. This function
nuclear@0 30 * should not be changed. If there is a need to handle errors differently,
nuclear@0 31 * you should supply a replacement error function and use png_set_error_fn()
nuclear@0 32 * to replace the error function at run-time.
nuclear@0 33 */
nuclear@0 34 #ifndef PNG_NO_ERROR_TEXT
nuclear@0 35 void PNGAPI
nuclear@0 36 png_error(png_structp png_ptr, png_const_charp error_message)
nuclear@0 37 {
nuclear@0 38 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 39 char msg[16];
nuclear@0 40 if (png_ptr != NULL)
nuclear@0 41 {
nuclear@0 42 if (png_ptr->flags&
nuclear@0 43 (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
nuclear@0 44 {
nuclear@0 45 if (*error_message == '#')
nuclear@0 46 {
nuclear@0 47 /* Strip "#nnnn " from beginning of error message. */
nuclear@0 48 int offset;
nuclear@0 49 for (offset = 1; offset<15; offset++)
nuclear@0 50 if (error_message[offset] == ' ')
nuclear@0 51 break;
nuclear@0 52 if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
nuclear@0 53 {
nuclear@0 54 int i;
nuclear@0 55 for (i = 0; i < offset - 1; i++)
nuclear@0 56 msg[i] = error_message[i + 1];
nuclear@0 57 msg[i - 1] = '\0';
nuclear@0 58 error_message = msg;
nuclear@0 59 }
nuclear@0 60 else
nuclear@0 61 error_message += offset;
nuclear@0 62 }
nuclear@0 63 else
nuclear@0 64 {
nuclear@0 65 if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
nuclear@0 66 {
nuclear@0 67 msg[0] = '0';
nuclear@0 68 msg[1] = '\0';
nuclear@0 69 error_message = msg;
nuclear@0 70 }
nuclear@0 71 }
nuclear@0 72 }
nuclear@0 73 }
nuclear@0 74 #endif
nuclear@0 75 if (png_ptr != NULL && png_ptr->error_fn != NULL)
nuclear@0 76 (*(png_ptr->error_fn))(png_ptr, error_message);
nuclear@0 77
nuclear@0 78 /* If the custom handler doesn't exist, or if it returns,
nuclear@0 79 use the default handler, which will not return. */
nuclear@0 80 png_default_error(png_ptr, error_message);
nuclear@0 81 }
nuclear@0 82 #else
nuclear@0 83 void PNGAPI
nuclear@0 84 png_err(png_structp png_ptr)
nuclear@0 85 {
nuclear@0 86 if (png_ptr != NULL && png_ptr->error_fn != NULL)
nuclear@0 87 (*(png_ptr->error_fn))(png_ptr, '\0');
nuclear@0 88
nuclear@0 89 /* If the custom handler doesn't exist, or if it returns,
nuclear@0 90 use the default handler, which will not return. */
nuclear@0 91 png_default_error(png_ptr, '\0');
nuclear@0 92 }
nuclear@0 93 #endif /* PNG_NO_ERROR_TEXT */
nuclear@0 94
nuclear@0 95 #ifndef PNG_NO_WARNINGS
nuclear@0 96 /* This function is called whenever there is a non-fatal error. This function
nuclear@0 97 * should not be changed. If there is a need to handle warnings differently,
nuclear@0 98 * you should supply a replacement warning function and use
nuclear@0 99 * png_set_error_fn() to replace the warning function at run-time.
nuclear@0 100 */
nuclear@0 101 void PNGAPI
nuclear@0 102 png_warning(png_structp png_ptr, png_const_charp warning_message)
nuclear@0 103 {
nuclear@0 104 int offset = 0;
nuclear@0 105 if (png_ptr != NULL)
nuclear@0 106 {
nuclear@0 107 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 108 if (png_ptr->flags&
nuclear@0 109 (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
nuclear@0 110 #endif
nuclear@0 111 {
nuclear@0 112 if (*warning_message == '#')
nuclear@0 113 {
nuclear@0 114 for (offset = 1; offset < 15; offset++)
nuclear@0 115 if (warning_message[offset] == ' ')
nuclear@0 116 break;
nuclear@0 117 }
nuclear@0 118 }
nuclear@0 119 if (png_ptr != NULL && png_ptr->warning_fn != NULL)
nuclear@0 120 (*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
nuclear@0 121 }
nuclear@0 122 else
nuclear@0 123 png_default_warning(png_ptr, warning_message + offset);
nuclear@0 124 }
nuclear@0 125 #endif /* PNG_NO_WARNINGS */
nuclear@0 126
nuclear@0 127
nuclear@0 128 /* These utilities are used internally to build an error message that relates
nuclear@0 129 * to the current chunk. The chunk name comes from png_ptr->chunk_name,
nuclear@0 130 * this is used to prefix the message. The message is limited in length
nuclear@0 131 * to 63 bytes, the name characters are output as hex digits wrapped in []
nuclear@0 132 * if the character is invalid.
nuclear@0 133 */
nuclear@0 134 #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
nuclear@0 135 static PNG_CONST char png_digit[16] = {
nuclear@0 136 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
nuclear@0 137 'A', 'B', 'C', 'D', 'E', 'F'
nuclear@0 138 };
nuclear@0 139
nuclear@0 140 #define PNG_MAX_ERROR_TEXT 64
nuclear@0 141
nuclear@0 142 #if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT)
nuclear@0 143 static void /* PRIVATE */
nuclear@0 144 png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
nuclear@0 145 error_message)
nuclear@0 146 {
nuclear@0 147 int iout = 0, iin = 0;
nuclear@0 148
nuclear@0 149 while (iin < 4)
nuclear@0 150 {
nuclear@0 151 int c = png_ptr->chunk_name[iin++];
nuclear@0 152 if (isnonalpha(c))
nuclear@0 153 {
nuclear@0 154 buffer[iout++] = '[';
nuclear@0 155 buffer[iout++] = png_digit[(c & 0xf0) >> 4];
nuclear@0 156 buffer[iout++] = png_digit[c & 0x0f];
nuclear@0 157 buffer[iout++] = ']';
nuclear@0 158 }
nuclear@0 159 else
nuclear@0 160 {
nuclear@0 161 buffer[iout++] = (png_byte)c;
nuclear@0 162 }
nuclear@0 163 }
nuclear@0 164
nuclear@0 165 if (error_message == NULL)
nuclear@0 166 buffer[iout] = '\0';
nuclear@0 167 else
nuclear@0 168 {
nuclear@0 169 buffer[iout++] = ':';
nuclear@0 170 buffer[iout++] = ' ';
nuclear@0 171 png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
nuclear@0 172 buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
nuclear@0 173 }
nuclear@0 174 }
nuclear@0 175
nuclear@0 176 #ifdef PNG_READ_SUPPORTED
nuclear@0 177 void PNGAPI
nuclear@0 178 png_chunk_error(png_structp png_ptr, png_const_charp error_message)
nuclear@0 179 {
nuclear@0 180 char msg[18+PNG_MAX_ERROR_TEXT];
nuclear@0 181 if (png_ptr == NULL)
nuclear@0 182 png_error(png_ptr, error_message);
nuclear@0 183 else
nuclear@0 184 {
nuclear@0 185 png_format_buffer(png_ptr, msg, error_message);
nuclear@0 186 png_error(png_ptr, msg);
nuclear@0 187 }
nuclear@0 188 }
nuclear@0 189 #endif /* PNG_READ_SUPPORTED */
nuclear@0 190 #endif /* !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) */
nuclear@0 191
nuclear@0 192 #ifndef PNG_NO_WARNINGS
nuclear@0 193 void PNGAPI
nuclear@0 194 png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
nuclear@0 195 {
nuclear@0 196 char msg[18+PNG_MAX_ERROR_TEXT];
nuclear@0 197 if (png_ptr == NULL)
nuclear@0 198 png_warning(png_ptr, warning_message);
nuclear@0 199 else
nuclear@0 200 {
nuclear@0 201 png_format_buffer(png_ptr, msg, warning_message);
nuclear@0 202 png_warning(png_ptr, msg);
nuclear@0 203 }
nuclear@0 204 }
nuclear@0 205 #endif /* PNG_NO_WARNINGS */
nuclear@0 206
nuclear@0 207
nuclear@0 208 /* This is the default error handling function. Note that replacements for
nuclear@0 209 * this function MUST NOT RETURN, or the program will likely crash. This
nuclear@0 210 * function is used by default, or if the program supplies NULL for the
nuclear@0 211 * error function pointer in png_set_error_fn().
nuclear@0 212 */
nuclear@0 213 static void /* PRIVATE */
nuclear@0 214 png_default_error(png_structp png_ptr, png_const_charp error_message)
nuclear@0 215 {
nuclear@0 216 #ifndef PNG_NO_CONSOLE_IO
nuclear@0 217 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 218 if (*error_message == '#')
nuclear@0 219 {
nuclear@0 220 /* Strip "#nnnn " from beginning of warning message. */
nuclear@0 221 int offset;
nuclear@0 222 char error_number[16];
nuclear@0 223 for (offset = 0; offset<15; offset++)
nuclear@0 224 {
nuclear@0 225 error_number[offset] = error_message[offset + 1];
nuclear@0 226 if (error_message[offset] == ' ')
nuclear@0 227 break;
nuclear@0 228 }
nuclear@0 229 if ((offset > 1) && (offset < 15))
nuclear@0 230 {
nuclear@0 231 error_number[offset - 1] = '\0';
nuclear@0 232 fprintf(stderr, "libpng error no. %s: %s\n", error_number,
nuclear@0 233 error_message + offset + 1);
nuclear@0 234 }
nuclear@0 235 else
nuclear@0 236 fprintf(stderr, "libpng error: %s, offset=%d\n", error_message, offset);
nuclear@0 237 }
nuclear@0 238 else
nuclear@0 239 #endif
nuclear@0 240 fprintf(stderr, "libpng error: %s\n", error_message);
nuclear@0 241 #endif
nuclear@0 242
nuclear@0 243 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 244 if (png_ptr)
nuclear@0 245 {
nuclear@0 246 # ifdef USE_FAR_KEYWORD
nuclear@0 247 {
nuclear@0 248 jmp_buf jmpbuf;
nuclear@0 249 png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@0 250 longjmp(jmpbuf, 1);
nuclear@0 251 }
nuclear@0 252 # else
nuclear@0 253 longjmp(png_ptr->jmpbuf, 1);
nuclear@0 254 # endif
nuclear@0 255 }
nuclear@0 256 #else
nuclear@0 257 PNG_ABORT();
nuclear@0 258 #endif
nuclear@0 259 #ifdef PNG_NO_CONSOLE_IO
nuclear@0 260 error_message = error_message; /* make compiler happy */
nuclear@0 261 #endif
nuclear@0 262 }
nuclear@0 263
nuclear@0 264 #ifndef PNG_NO_WARNINGS
nuclear@0 265 /* This function is called when there is a warning, but the library thinks
nuclear@0 266 * it can continue anyway. Replacement functions don't have to do anything
nuclear@0 267 * here if you don't want them to. In the default configuration, png_ptr is
nuclear@0 268 * not used, but it is passed in case it may be useful.
nuclear@0 269 */
nuclear@0 270 static void /* PRIVATE */
nuclear@0 271 png_default_warning(png_structp png_ptr, png_const_charp warning_message)
nuclear@0 272 {
nuclear@0 273 #ifndef PNG_NO_CONSOLE_IO
nuclear@0 274 # ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 275 if (*warning_message == '#')
nuclear@0 276 {
nuclear@0 277 int offset;
nuclear@0 278 char warning_number[16];
nuclear@0 279 for (offset = 0; offset < 15; offset++)
nuclear@0 280 {
nuclear@0 281 warning_number[offset] = warning_message[offset + 1];
nuclear@0 282 if (warning_message[offset] == ' ')
nuclear@0 283 break;
nuclear@0 284 }
nuclear@0 285 if ((offset > 1) && (offset < 15))
nuclear@0 286 {
nuclear@0 287 warning_number[offset + 1] = '\0';
nuclear@0 288 fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
nuclear@0 289 warning_message + offset);
nuclear@0 290 }
nuclear@0 291 else
nuclear@0 292 fprintf(stderr, "libpng warning: %s\n", warning_message);
nuclear@0 293 }
nuclear@0 294 else
nuclear@0 295 # endif
nuclear@0 296 fprintf(stderr, "libpng warning: %s\n", warning_message);
nuclear@0 297 #else
nuclear@0 298 warning_message = warning_message; /* make compiler happy */
nuclear@0 299 #endif
nuclear@0 300 png_ptr = png_ptr; /* make compiler happy */
nuclear@0 301 }
nuclear@0 302 #endif /* PNG_NO_WARNINGS */
nuclear@0 303
nuclear@0 304 /* This function is called when the application wants to use another method
nuclear@0 305 * of handling errors and warnings. Note that the error function MUST NOT
nuclear@0 306 * return to the calling routine or serious problems will occur. The return
nuclear@0 307 * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
nuclear@0 308 */
nuclear@0 309 void PNGAPI
nuclear@0 310 png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
nuclear@0 311 png_error_ptr error_fn, png_error_ptr warning_fn)
nuclear@0 312 {
nuclear@0 313 if (png_ptr == NULL)
nuclear@0 314 return;
nuclear@0 315 png_ptr->error_ptr = error_ptr;
nuclear@0 316 png_ptr->error_fn = error_fn;
nuclear@0 317 png_ptr->warning_fn = warning_fn;
nuclear@0 318 }
nuclear@0 319
nuclear@0 320
nuclear@0 321 /* This function returns a pointer to the error_ptr associated with the user
nuclear@0 322 * functions. The application should free any memory associated with this
nuclear@0 323 * pointer before png_write_destroy and png_read_destroy are called.
nuclear@0 324 */
nuclear@0 325 png_voidp PNGAPI
nuclear@0 326 png_get_error_ptr(png_structp png_ptr)
nuclear@0 327 {
nuclear@0 328 if (png_ptr == NULL)
nuclear@0 329 return NULL;
nuclear@0 330 return ((png_voidp)png_ptr->error_ptr);
nuclear@0 331 }
nuclear@0 332
nuclear@0 333
nuclear@0 334 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 335 void PNGAPI
nuclear@0 336 png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
nuclear@0 337 {
nuclear@0 338 if (png_ptr != NULL)
nuclear@0 339 {
nuclear@0 340 png_ptr->flags &=
nuclear@0 341 ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
nuclear@0 342 }
nuclear@0 343 }
nuclear@0 344 #endif
nuclear@0 345 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */