The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame^] | 1 | |
| 2 | /* pngerror.c - stub functions for i/o and memory allocation |
| 3 | * |
| 4 | * Last changed in libpng 1.2.22 [October 13, 2007] |
| 5 | * For conditions of distribution and use, see copyright notice in png.h |
| 6 | * Copyright (c) 1998-2007 Glenn Randers-Pehrson |
| 7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 9 | * |
| 10 | * This file provides a location for all error handling. Users who |
| 11 | * need special error handling are expected to write replacement functions |
| 12 | * and use png_set_error_fn() to use those functions. See the instructions |
| 13 | * at each function. |
| 14 | */ |
| 15 | |
| 16 | #define PNG_INTERNAL |
| 17 | #include "png.h" |
| 18 | |
| 19 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 20 | static void /* PRIVATE */ |
| 21 | png_default_error PNGARG((png_structp png_ptr, |
| 22 | png_const_charp error_message)); |
| 23 | #ifndef PNG_NO_WARNINGS |
| 24 | static void /* PRIVATE */ |
| 25 | png_default_warning PNGARG((png_structp png_ptr, |
| 26 | png_const_charp warning_message)); |
| 27 | #endif /* PNG_NO_WARNINGS */ |
| 28 | |
| 29 | /* This function is called whenever there is a fatal error. This function |
| 30 | * should not be changed. If there is a need to handle errors differently, |
| 31 | * you should supply a replacement error function and use png_set_error_fn() |
| 32 | * to replace the error function at run-time. |
| 33 | */ |
| 34 | #ifndef PNG_NO_ERROR_TEXT |
| 35 | void PNGAPI |
| 36 | png_error(png_structp png_ptr, png_const_charp error_message) |
| 37 | { |
| 38 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 39 | char msg[16]; |
| 40 | if (png_ptr != NULL) |
| 41 | { |
| 42 | if (png_ptr->flags& |
| 43 | (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) |
| 44 | { |
| 45 | if (*error_message == '#') |
| 46 | { |
| 47 | int offset; |
| 48 | for (offset=1; offset<15; offset++) |
| 49 | if (*(error_message+offset) == ' ') |
| 50 | break; |
| 51 | if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) |
| 52 | { |
| 53 | int i; |
| 54 | for (i=0; i<offset-1; i++) |
| 55 | msg[i]=error_message[i+1]; |
| 56 | msg[i]='\0'; |
| 57 | error_message=msg; |
| 58 | } |
| 59 | else |
| 60 | error_message+=offset; |
| 61 | } |
| 62 | else |
| 63 | { |
| 64 | if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) |
| 65 | { |
| 66 | msg[0]='0'; |
| 67 | msg[1]='\0'; |
| 68 | error_message=msg; |
| 69 | } |
| 70 | } |
| 71 | } |
| 72 | } |
| 73 | #endif |
| 74 | if (png_ptr != NULL && png_ptr->error_fn != NULL) |
| 75 | (*(png_ptr->error_fn))(png_ptr, error_message); |
| 76 | |
| 77 | /* If the custom handler doesn't exist, or if it returns, |
| 78 | use the default handler, which will not return. */ |
| 79 | png_default_error(png_ptr, error_message); |
| 80 | } |
| 81 | #else |
| 82 | void PNGAPI |
| 83 | png_err(png_structp png_ptr) |
| 84 | { |
| 85 | if (png_ptr != NULL && png_ptr->error_fn != NULL) |
| 86 | (*(png_ptr->error_fn))(png_ptr, '\0'); |
| 87 | |
| 88 | /* If the custom handler doesn't exist, or if it returns, |
| 89 | use the default handler, which will not return. */ |
| 90 | png_default_error(png_ptr, '\0'); |
| 91 | } |
| 92 | #endif /* PNG_NO_ERROR_TEXT */ |
| 93 | |
| 94 | #ifndef PNG_NO_WARNINGS |
| 95 | /* This function is called whenever there is a non-fatal error. This function |
| 96 | * should not be changed. If there is a need to handle warnings differently, |
| 97 | * you should supply a replacement warning function and use |
| 98 | * png_set_error_fn() to replace the warning function at run-time. |
| 99 | */ |
| 100 | void PNGAPI |
| 101 | png_warning(png_structp png_ptr, png_const_charp warning_message) |
| 102 | { |
| 103 | int offset = 0; |
| 104 | if (png_ptr != NULL) |
| 105 | { |
| 106 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 107 | if (png_ptr->flags& |
| 108 | (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) |
| 109 | #endif |
| 110 | { |
| 111 | if (*warning_message == '#') |
| 112 | { |
| 113 | for (offset=1; offset<15; offset++) |
| 114 | if (*(warning_message+offset) == ' ') |
| 115 | break; |
| 116 | } |
| 117 | } |
| 118 | if (png_ptr != NULL && png_ptr->warning_fn != NULL) |
| 119 | (*(png_ptr->warning_fn))(png_ptr, warning_message+offset); |
| 120 | } |
| 121 | else |
| 122 | png_default_warning(png_ptr, warning_message+offset); |
| 123 | } |
| 124 | #endif /* PNG_NO_WARNINGS */ |
| 125 | |
| 126 | |
| 127 | /* These utilities are used internally to build an error message that relates |
| 128 | * to the current chunk. The chunk name comes from png_ptr->chunk_name, |
| 129 | * this is used to prefix the message. The message is limited in length |
| 130 | * to 63 bytes, the name characters are output as hex digits wrapped in [] |
| 131 | * if the character is invalid. |
| 132 | */ |
| 133 | #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) |
| 134 | static PNG_CONST char png_digit[16] = { |
| 135 | '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', |
| 136 | 'A', 'B', 'C', 'D', 'E', 'F' |
| 137 | }; |
| 138 | |
| 139 | #define PNG_MAX_ERROR_TEXT 64 |
| 140 | |
| 141 | #if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) |
| 142 | static void /* PRIVATE */ |
| 143 | png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp |
| 144 | error_message) |
| 145 | { |
| 146 | int iout = 0, iin = 0; |
| 147 | |
| 148 | while (iin < 4) |
| 149 | { |
| 150 | int c = png_ptr->chunk_name[iin++]; |
| 151 | if (isnonalpha(c)) |
| 152 | { |
| 153 | buffer[iout++] = '['; |
| 154 | buffer[iout++] = png_digit[(c & 0xf0) >> 4]; |
| 155 | buffer[iout++] = png_digit[c & 0x0f]; |
| 156 | buffer[iout++] = ']'; |
| 157 | } |
| 158 | else |
| 159 | { |
| 160 | buffer[iout++] = (png_byte)c; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | if (error_message == NULL) |
| 165 | buffer[iout] = '\0'; |
| 166 | else |
| 167 | { |
| 168 | buffer[iout++] = ':'; |
| 169 | buffer[iout++] = ' '; |
| 170 | png_memcpy(buffer+iout, error_message, PNG_MAX_ERROR_TEXT); |
| 171 | buffer[iout+PNG_MAX_ERROR_TEXT-1] = '\0'; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | #ifdef PNG_READ_SUPPORTED |
| 176 | void PNGAPI |
| 177 | png_chunk_error(png_structp png_ptr, png_const_charp error_message) |
| 178 | { |
| 179 | char msg[18+PNG_MAX_ERROR_TEXT]; |
| 180 | if (png_ptr == NULL) |
| 181 | png_error(png_ptr, error_message); |
| 182 | else |
| 183 | { |
| 184 | png_format_buffer(png_ptr, msg, error_message); |
| 185 | png_error(png_ptr, msg); |
| 186 | } |
| 187 | } |
| 188 | #endif /* PNG_READ_SUPPORTED */ |
| 189 | #endif /* !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) */ |
| 190 | |
| 191 | #ifndef PNG_NO_WARNINGS |
| 192 | void PNGAPI |
| 193 | png_chunk_warning(png_structp png_ptr, png_const_charp warning_message) |
| 194 | { |
| 195 | char msg[18+PNG_MAX_ERROR_TEXT]; |
| 196 | if (png_ptr == NULL) |
| 197 | png_warning(png_ptr, warning_message); |
| 198 | else |
| 199 | { |
| 200 | png_format_buffer(png_ptr, msg, warning_message); |
| 201 | png_warning(png_ptr, msg); |
| 202 | } |
| 203 | } |
| 204 | #endif /* PNG_NO_WARNINGS */ |
| 205 | |
| 206 | |
| 207 | /* This is the default error handling function. Note that replacements for |
| 208 | * this function MUST NOT RETURN, or the program will likely crash. This |
| 209 | * function is used by default, or if the program supplies NULL for the |
| 210 | * error function pointer in png_set_error_fn(). |
| 211 | */ |
| 212 | static void /* PRIVATE */ |
| 213 | png_default_error(png_structp png_ptr, png_const_charp error_message) |
| 214 | { |
| 215 | #ifndef PNG_NO_CONSOLE_IO |
| 216 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 217 | if (*error_message == '#') |
| 218 | { |
| 219 | int offset; |
| 220 | char error_number[16]; |
| 221 | for (offset=0; offset<15; offset++) |
| 222 | { |
| 223 | error_number[offset] = *(error_message+offset+1); |
| 224 | if (*(error_message+offset) == ' ') |
| 225 | break; |
| 226 | } |
| 227 | if((offset > 1) && (offset < 15)) |
| 228 | { |
| 229 | error_number[offset-1]='\0'; |
| 230 | fprintf(stderr, "libpng error no. %s: %s\n", error_number, |
| 231 | error_message+offset); |
| 232 | } |
| 233 | else |
| 234 | fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset); |
| 235 | } |
| 236 | else |
| 237 | #endif |
| 238 | fprintf(stderr, "libpng error: %s\n", error_message); |
| 239 | #endif |
| 240 | |
| 241 | #ifdef PNG_SETJMP_SUPPORTED |
| 242 | if (png_ptr) |
| 243 | { |
| 244 | # ifdef USE_FAR_KEYWORD |
| 245 | { |
| 246 | jmp_buf jmpbuf; |
| 247 | png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf)); |
| 248 | longjmp(jmpbuf, 1); |
| 249 | } |
| 250 | # else |
| 251 | longjmp(png_ptr->jmpbuf, 1); |
| 252 | # endif |
| 253 | } |
| 254 | #else |
| 255 | PNG_ABORT(); |
| 256 | #endif |
| 257 | #ifdef PNG_NO_CONSOLE_IO |
| 258 | error_message = error_message; /* make compiler happy */ |
| 259 | #endif |
| 260 | } |
| 261 | |
| 262 | #ifndef PNG_NO_WARNINGS |
| 263 | /* This function is called when there is a warning, but the library thinks |
| 264 | * it can continue anyway. Replacement functions don't have to do anything |
| 265 | * here if you don't want them to. In the default configuration, png_ptr is |
| 266 | * not used, but it is passed in case it may be useful. |
| 267 | */ |
| 268 | static void /* PRIVATE */ |
| 269 | png_default_warning(png_structp png_ptr, png_const_charp warning_message) |
| 270 | { |
| 271 | #ifndef PNG_NO_CONSOLE_IO |
| 272 | # ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 273 | if (*warning_message == '#') |
| 274 | { |
| 275 | int offset; |
| 276 | char warning_number[16]; |
| 277 | for (offset=0; offset<15; offset++) |
| 278 | { |
| 279 | warning_number[offset]=*(warning_message+offset+1); |
| 280 | if (*(warning_message+offset) == ' ') |
| 281 | break; |
| 282 | } |
| 283 | if((offset > 1) && (offset < 15)) |
| 284 | { |
| 285 | warning_number[offset-1]='\0'; |
| 286 | fprintf(stderr, "libpng warning no. %s: %s\n", warning_number, |
| 287 | warning_message+offset); |
| 288 | } |
| 289 | else |
| 290 | fprintf(stderr, "libpng warning: %s\n", warning_message); |
| 291 | } |
| 292 | else |
| 293 | # endif |
| 294 | fprintf(stderr, "libpng warning: %s\n", warning_message); |
| 295 | #else |
| 296 | warning_message = warning_message; /* make compiler happy */ |
| 297 | #endif |
| 298 | png_ptr = png_ptr; /* make compiler happy */ |
| 299 | } |
| 300 | #endif /* PNG_NO_WARNINGS */ |
| 301 | |
| 302 | /* This function is called when the application wants to use another method |
| 303 | * of handling errors and warnings. Note that the error function MUST NOT |
| 304 | * return to the calling routine or serious problems will occur. The return |
| 305 | * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1) |
| 306 | */ |
| 307 | void PNGAPI |
| 308 | png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, |
| 309 | png_error_ptr error_fn, png_error_ptr warning_fn) |
| 310 | { |
| 311 | if (png_ptr == NULL) |
| 312 | return; |
| 313 | png_ptr->error_ptr = error_ptr; |
| 314 | png_ptr->error_fn = error_fn; |
| 315 | png_ptr->warning_fn = warning_fn; |
| 316 | } |
| 317 | |
| 318 | |
| 319 | /* This function returns a pointer to the error_ptr associated with the user |
| 320 | * functions. The application should free any memory associated with this |
| 321 | * pointer before png_write_destroy and png_read_destroy are called. |
| 322 | */ |
| 323 | png_voidp PNGAPI |
| 324 | png_get_error_ptr(png_structp png_ptr) |
| 325 | { |
| 326 | if (png_ptr == NULL) |
| 327 | return NULL; |
| 328 | return ((png_voidp)png_ptr->error_ptr); |
| 329 | } |
| 330 | |
| 331 | |
| 332 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 333 | void PNGAPI |
| 334 | png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode) |
| 335 | { |
| 336 | if(png_ptr != NULL) |
| 337 | { |
| 338 | png_ptr->flags &= |
| 339 | ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); |
| 340 | } |
| 341 | } |
| 342 | #endif |
| 343 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ |