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comparison: security/nss/lib/zlib/gzlib.c
security/nss/lib/zlib/gzlib.c
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| -1:000000000000 | 0:723886bb7474 |
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| 1 /* gzlib.c -- zlib functions common to reading and writing gzip files | |
| 2 * Copyright (C) 2004, 2010 Mark Adler | |
| 3 * For conditions of distribution and use, see copyright notice in zlib.h | |
| 4 */ | |
| 5 | |
| 6 #include "gzguts.h" | |
| 7 | |
| 8 #if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0 | |
| 9 # define LSEEK lseek64 | |
| 10 #else | |
| 11 # define LSEEK lseek | |
| 12 #endif | |
| 13 | |
| 14 /* Local functions */ | |
| 15 local void gz_reset OF((gz_statep)); | |
| 16 local gzFile gz_open OF((const char *, int, const char *)); | |
| 17 | |
| 18 #if defined UNDER_CE | |
| 19 | |
| 20 /* Map the Windows error number in ERROR to a locale-dependent error message | |
| 21 string and return a pointer to it. Typically, the values for ERROR come | |
| 22 from GetLastError. | |
| 23 | |
| 24 The string pointed to shall not be modified by the application, but may be | |
| 25 overwritten by a subsequent call to gz_strwinerror | |
| 26 | |
| 27 The gz_strwinerror function does not change the current setting of | |
| 28 GetLastError. */ | |
| 29 char ZLIB_INTERNAL *gz_strwinerror (error) | |
| 30 DWORD error; | |
| 31 { | |
| 32 static char buf[1024]; | |
| 33 | |
| 34 wchar_t *msgbuf; | |
| 35 DWORD lasterr = GetLastError(); | |
| 36 DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | |
| 37 | FORMAT_MESSAGE_ALLOCATE_BUFFER, | |
| 38 NULL, | |
| 39 error, | |
| 40 0, /* Default language */ | |
| 41 (LPVOID)&msgbuf, | |
| 42 0, | |
| 43 NULL); | |
| 44 if (chars != 0) { | |
| 45 /* If there is an \r\n appended, zap it. */ | |
| 46 if (chars >= 2 | |
| 47 && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { | |
| 48 chars -= 2; | |
| 49 msgbuf[chars] = 0; | |
| 50 } | |
| 51 | |
| 52 if (chars > sizeof (buf) - 1) { | |
| 53 chars = sizeof (buf) - 1; | |
| 54 msgbuf[chars] = 0; | |
| 55 } | |
| 56 | |
| 57 wcstombs(buf, msgbuf, chars + 1); | |
| 58 LocalFree(msgbuf); | |
| 59 } | |
| 60 else { | |
| 61 sprintf(buf, "unknown win32 error (%ld)", error); | |
| 62 } | |
| 63 | |
| 64 SetLastError(lasterr); | |
| 65 return buf; | |
| 66 } | |
| 67 | |
| 68 #endif /* UNDER_CE */ | |
| 69 | |
| 70 /* Reset gzip file state */ | |
| 71 local void gz_reset(state) | |
| 72 gz_statep state; | |
| 73 { | |
| 74 if (state->mode == GZ_READ) { /* for reading ... */ | |
| 75 state->have = 0; /* no output data available */ | |
| 76 state->eof = 0; /* not at end of file */ | |
| 77 state->how = LOOK; /* look for gzip header */ | |
| 78 state->direct = 1; /* default for empty file */ | |
| 79 } | |
| 80 state->seek = 0; /* no seek request pending */ | |
| 81 gz_error(state, Z_OK, NULL); /* clear error */ | |
| 82 state->pos = 0; /* no uncompressed data yet */ | |
| 83 state->strm.avail_in = 0; /* no input data yet */ | |
| 84 } | |
| 85 | |
| 86 /* Open a gzip file either by name or file descriptor. */ | |
| 87 local gzFile gz_open(path, fd, mode) | |
| 88 const char *path; | |
| 89 int fd; | |
| 90 const char *mode; | |
| 91 { | |
| 92 gz_statep state; | |
| 93 | |
| 94 /* allocate gzFile structure to return */ | |
| 95 state = malloc(sizeof(gz_state)); | |
| 96 if (state == NULL) | |
| 97 return NULL; | |
| 98 state->size = 0; /* no buffers allocated yet */ | |
| 99 state->want = GZBUFSIZE; /* requested buffer size */ | |
| 100 state->msg = NULL; /* no error message yet */ | |
| 101 | |
| 102 /* interpret mode */ | |
| 103 state->mode = GZ_NONE; | |
| 104 state->level = Z_DEFAULT_COMPRESSION; | |
| 105 state->strategy = Z_DEFAULT_STRATEGY; | |
| 106 while (*mode) { | |
| 107 if (*mode >= '0' && *mode <= '9') | |
| 108 state->level = *mode - '0'; | |
| 109 else | |
| 110 switch (*mode) { | |
| 111 case 'r': | |
| 112 state->mode = GZ_READ; | |
| 113 break; | |
| 114 #ifndef NO_GZCOMPRESS | |
| 115 case 'w': | |
| 116 state->mode = GZ_WRITE; | |
| 117 break; | |
| 118 case 'a': | |
| 119 state->mode = GZ_APPEND; | |
| 120 break; | |
| 121 #endif | |
| 122 case '+': /* can't read and write at the same time */ | |
| 123 free(state); | |
| 124 return NULL; | |
| 125 case 'b': /* ignore -- will request binary anyway */ | |
| 126 break; | |
| 127 case 'f': | |
| 128 state->strategy = Z_FILTERED; | |
| 129 break; | |
| 130 case 'h': | |
| 131 state->strategy = Z_HUFFMAN_ONLY; | |
| 132 break; | |
| 133 case 'R': | |
| 134 state->strategy = Z_RLE; | |
| 135 break; | |
| 136 case 'F': | |
| 137 state->strategy = Z_FIXED; | |
| 138 default: /* could consider as an error, but just ignore */ | |
| 139 ; | |
| 140 } | |
| 141 mode++; | |
| 142 } | |
| 143 | |
| 144 /* must provide an "r", "w", or "a" */ | |
| 145 if (state->mode == GZ_NONE) { | |
| 146 free(state); | |
| 147 return NULL; | |
| 148 } | |
| 149 | |
| 150 /* save the path name for error messages */ | |
| 151 state->path = malloc(strlen(path) + 1); | |
| 152 if (state->path == NULL) { | |
| 153 free(state); | |
| 154 return NULL; | |
| 155 } | |
| 156 strcpy(state->path, path); | |
| 157 | |
| 158 /* open the file with the appropriate mode (or just use fd) */ | |
| 159 state->fd = fd != -1 ? fd : | |
| 160 open(path, | |
| 161 #ifdef O_LARGEFILE | |
| 162 O_LARGEFILE | | |
| 163 #endif | |
| 164 #ifdef O_BINARY | |
| 165 O_BINARY | | |
| 166 #endif | |
| 167 (state->mode == GZ_READ ? | |
| 168 O_RDONLY : | |
| 169 (O_WRONLY | O_CREAT | ( | |
| 170 state->mode == GZ_WRITE ? | |
| 171 O_TRUNC : | |
| 172 O_APPEND))), | |
| 173 0666); | |
| 174 if (state->fd == -1) { | |
| 175 free(state->path); | |
| 176 free(state); | |
| 177 return NULL; | |
| 178 } | |
| 179 if (state->mode == GZ_APPEND) | |
| 180 state->mode = GZ_WRITE; /* simplify later checks */ | |
| 181 | |
| 182 /* save the current position for rewinding (only if reading) */ | |
| 183 if (state->mode == GZ_READ) { | |
| 184 state->start = LSEEK(state->fd, 0, SEEK_CUR); | |
| 185 if (state->start == -1) state->start = 0; | |
| 186 } | |
| 187 | |
| 188 /* initialize stream */ | |
| 189 gz_reset(state); | |
| 190 | |
| 191 /* return stream */ | |
| 192 return (gzFile)state; | |
| 193 } | |
| 194 | |
| 195 /* -- see zlib.h -- */ | |
| 196 gzFile ZEXPORT gzopen(path, mode) | |
| 197 const char *path; | |
| 198 const char *mode; | |
| 199 { | |
| 200 return gz_open(path, -1, mode); | |
| 201 } | |
| 202 | |
| 203 /* -- see zlib.h -- */ | |
| 204 gzFile ZEXPORT gzopen64(path, mode) | |
| 205 const char *path; | |
| 206 const char *mode; | |
| 207 { | |
| 208 return gz_open(path, -1, mode); | |
| 209 } | |
| 210 | |
| 211 /* -- see zlib.h -- */ | |
| 212 gzFile ZEXPORT gzdopen(fd, mode) | |
| 213 int fd; | |
| 214 const char *mode; | |
| 215 { | |
| 216 char *path; /* identifier for error messages */ | |
| 217 gzFile gz; | |
| 218 | |
| 219 if (fd == -1 || (path = malloc(7 + 3 * sizeof(int))) == NULL) | |
| 220 return NULL; | |
| 221 sprintf(path, "<fd:%d>", fd); /* for debugging */ | |
| 222 gz = gz_open(path, fd, mode); | |
| 223 free(path); | |
| 224 return gz; | |
| 225 } | |
| 226 | |
| 227 /* -- see zlib.h -- */ | |
| 228 int ZEXPORT gzbuffer(file, size) | |
| 229 gzFile file; | |
| 230 unsigned size; | |
| 231 { | |
| 232 gz_statep state; | |
| 233 | |
| 234 /* get internal structure and check integrity */ | |
| 235 if (file == NULL) | |
| 236 return -1; | |
| 237 state = (gz_statep)file; | |
| 238 if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
| 239 return -1; | |
| 240 | |
| 241 /* make sure we haven't already allocated memory */ | |
| 242 if (state->size != 0) | |
| 243 return -1; | |
| 244 | |
| 245 /* check and set requested size */ | |
| 246 if (size == 0) | |
| 247 return -1; | |
| 248 state->want = size; | |
| 249 return 0; | |
| 250 } | |
| 251 | |
| 252 /* -- see zlib.h -- */ | |
| 253 int ZEXPORT gzrewind(file) | |
| 254 gzFile file; | |
| 255 { | |
| 256 gz_statep state; | |
| 257 | |
| 258 /* get internal structure */ | |
| 259 if (file == NULL) | |
| 260 return -1; | |
| 261 state = (gz_statep)file; | |
| 262 | |
| 263 /* check that we're reading and that there's no error */ | |
| 264 if (state->mode != GZ_READ || state->err != Z_OK) | |
| 265 return -1; | |
| 266 | |
| 267 /* back up and start over */ | |
| 268 if (LSEEK(state->fd, state->start, SEEK_SET) == -1) | |
| 269 return -1; | |
| 270 gz_reset(state); | |
| 271 return 0; | |
| 272 } | |
| 273 | |
| 274 /* -- see zlib.h -- */ | |
| 275 z_off64_t ZEXPORT gzseek64(file, offset, whence) | |
| 276 gzFile file; | |
| 277 z_off64_t offset; | |
| 278 int whence; | |
| 279 { | |
| 280 unsigned n; | |
| 281 z_off64_t ret; | |
| 282 gz_statep state; | |
| 283 | |
| 284 /* get internal structure and check integrity */ | |
| 285 if (file == NULL) | |
| 286 return -1; | |
| 287 state = (gz_statep)file; | |
| 288 if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
| 289 return -1; | |
| 290 | |
| 291 /* check that there's no error */ | |
| 292 if (state->err != Z_OK) | |
| 293 return -1; | |
| 294 | |
| 295 /* can only seek from start or relative to current position */ | |
| 296 if (whence != SEEK_SET && whence != SEEK_CUR) | |
| 297 return -1; | |
| 298 | |
| 299 /* normalize offset to a SEEK_CUR specification */ | |
| 300 if (whence == SEEK_SET) | |
| 301 offset -= state->pos; | |
| 302 else if (state->seek) | |
| 303 offset += state->skip; | |
| 304 state->seek = 0; | |
| 305 | |
| 306 /* if within raw area while reading, just go there */ | |
| 307 if (state->mode == GZ_READ && state->how == COPY && | |
| 308 state->pos + offset >= state->raw) { | |
| 309 ret = LSEEK(state->fd, offset - state->have, SEEK_CUR); | |
| 310 if (ret == -1) | |
| 311 return -1; | |
| 312 state->have = 0; | |
| 313 state->eof = 0; | |
| 314 state->seek = 0; | |
| 315 gz_error(state, Z_OK, NULL); | |
| 316 state->strm.avail_in = 0; | |
| 317 state->pos += offset; | |
| 318 return state->pos; | |
| 319 } | |
| 320 | |
| 321 /* calculate skip amount, rewinding if needed for back seek when reading */ | |
| 322 if (offset < 0) { | |
| 323 if (state->mode != GZ_READ) /* writing -- can't go backwards */ | |
| 324 return -1; | |
| 325 offset += state->pos; | |
| 326 if (offset < 0) /* before start of file! */ | |
| 327 return -1; | |
| 328 if (gzrewind(file) == -1) /* rewind, then skip to offset */ | |
| 329 return -1; | |
| 330 } | |
| 331 | |
| 332 /* if reading, skip what's in output buffer (one less gzgetc() check) */ | |
| 333 if (state->mode == GZ_READ) { | |
| 334 n = GT_OFF(state->have) || (z_off64_t)state->have > offset ? | |
| 335 (unsigned)offset : state->have; | |
| 336 state->have -= n; | |
| 337 state->next += n; | |
| 338 state->pos += n; | |
| 339 offset -= n; | |
| 340 } | |
| 341 | |
| 342 /* request skip (if not zero) */ | |
| 343 if (offset) { | |
| 344 state->seek = 1; | |
| 345 state->skip = offset; | |
| 346 } | |
| 347 return state->pos + offset; | |
| 348 } | |
| 349 | |
| 350 /* -- see zlib.h -- */ | |
| 351 z_off_t ZEXPORT gzseek(file, offset, whence) | |
| 352 gzFile file; | |
| 353 z_off_t offset; | |
| 354 int whence; | |
| 355 { | |
| 356 z_off64_t ret; | |
| 357 | |
| 358 ret = gzseek64(file, (z_off64_t)offset, whence); | |
| 359 return ret == (z_off_t)ret ? (z_off_t)ret : -1; | |
| 360 } | |
| 361 | |
| 362 /* -- see zlib.h -- */ | |
| 363 z_off64_t ZEXPORT gztell64(file) | |
| 364 gzFile file; | |
| 365 { | |
| 366 gz_statep state; | |
| 367 | |
| 368 /* get internal structure and check integrity */ | |
| 369 if (file == NULL) | |
| 370 return -1; | |
| 371 state = (gz_statep)file; | |
| 372 if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
| 373 return -1; | |
| 374 | |
| 375 /* return position */ | |
| 376 return state->pos + (state->seek ? state->skip : 0); | |
| 377 } | |
| 378 | |
| 379 /* -- see zlib.h -- */ | |
| 380 z_off_t ZEXPORT gztell(file) | |
| 381 gzFile file; | |
| 382 { | |
| 383 z_off64_t ret; | |
| 384 | |
| 385 ret = gztell64(file); | |
| 386 return ret == (z_off_t)ret ? (z_off_t)ret : -1; | |
| 387 } | |
| 388 | |
| 389 /* -- see zlib.h -- */ | |
| 390 z_off64_t ZEXPORT gzoffset64(file) | |
| 391 gzFile file; | |
| 392 { | |
| 393 z_off64_t offset; | |
| 394 gz_statep state; | |
| 395 | |
| 396 /* get internal structure and check integrity */ | |
| 397 if (file == NULL) | |
| 398 return -1; | |
| 399 state = (gz_statep)file; | |
| 400 if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
| 401 return -1; | |
| 402 | |
| 403 /* compute and return effective offset in file */ | |
| 404 offset = LSEEK(state->fd, 0, SEEK_CUR); | |
| 405 if (offset == -1) | |
| 406 return -1; | |
| 407 if (state->mode == GZ_READ) /* reading */ | |
| 408 offset -= state->strm.avail_in; /* don't count buffered input */ | |
| 409 return offset; | |
| 410 } | |
| 411 | |
| 412 /* -- see zlib.h -- */ | |
| 413 z_off_t ZEXPORT gzoffset(file) | |
| 414 gzFile file; | |
| 415 { | |
| 416 z_off64_t ret; | |
| 417 | |
| 418 ret = gzoffset64(file); | |
| 419 return ret == (z_off_t)ret ? (z_off_t)ret : -1; | |
| 420 } | |
| 421 | |
| 422 /* -- see zlib.h -- */ | |
| 423 int ZEXPORT gzeof(file) | |
| 424 gzFile file; | |
| 425 { | |
| 426 gz_statep state; | |
| 427 | |
| 428 /* get internal structure and check integrity */ | |
| 429 if (file == NULL) | |
| 430 return 0; | |
| 431 state = (gz_statep)file; | |
| 432 if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
| 433 return 0; | |
| 434 | |
| 435 /* return end-of-file state */ | |
| 436 return state->mode == GZ_READ ? | |
| 437 (state->eof && state->strm.avail_in == 0 && state->have == 0) : 0; | |
| 438 } | |
| 439 | |
| 440 /* -- see zlib.h -- */ | |
| 441 const char * ZEXPORT gzerror(file, errnum) | |
| 442 gzFile file; | |
| 443 int *errnum; | |
| 444 { | |
| 445 gz_statep state; | |
| 446 | |
| 447 /* get internal structure and check integrity */ | |
| 448 if (file == NULL) | |
| 449 return NULL; | |
| 450 state = (gz_statep)file; | |
| 451 if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
| 452 return NULL; | |
| 453 | |
| 454 /* return error information */ | |
| 455 if (errnum != NULL) | |
| 456 *errnum = state->err; | |
| 457 return state->msg == NULL ? "" : state->msg; | |
| 458 } | |
| 459 | |
| 460 /* -- see zlib.h -- */ | |
| 461 void ZEXPORT gzclearerr(file) | |
| 462 gzFile file; | |
| 463 { | |
| 464 gz_statep state; | |
| 465 | |
| 466 /* get internal structure and check integrity */ | |
| 467 if (file == NULL) | |
| 468 return; | |
| 469 state = (gz_statep)file; | |
| 470 if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
| 471 return; | |
| 472 | |
| 473 /* clear error and end-of-file */ | |
| 474 if (state->mode == GZ_READ) | |
| 475 state->eof = 0; | |
| 476 gz_error(state, Z_OK, NULL); | |
| 477 } | |
| 478 | |
| 479 /* Create an error message in allocated memory and set state->err and | |
| 480 state->msg accordingly. Free any previous error message already there. Do | |
| 481 not try to free or allocate space if the error is Z_MEM_ERROR (out of | |
| 482 memory). Simply save the error message as a static string. If there is an | |
| 483 allocation failure constructing the error message, then convert the error to | |
| 484 out of memory. */ | |
| 485 void ZLIB_INTERNAL gz_error(state, err, msg) | |
| 486 gz_statep state; | |
| 487 int err; | |
| 488 const char *msg; | |
| 489 { | |
| 490 /* free previously allocated message and clear */ | |
| 491 if (state->msg != NULL) { | |
| 492 if (state->err != Z_MEM_ERROR) | |
| 493 free(state->msg); | |
| 494 state->msg = NULL; | |
| 495 } | |
| 496 | |
| 497 /* set error code, and if no message, then done */ | |
| 498 state->err = err; | |
| 499 if (msg == NULL) | |
| 500 return; | |
| 501 | |
| 502 /* for an out of memory error, save as static string */ | |
| 503 if (err == Z_MEM_ERROR) { | |
| 504 state->msg = (char *)msg; | |
| 505 return; | |
| 506 } | |
| 507 | |
| 508 /* construct error message with path */ | |
| 509 if ((state->msg = malloc(strlen(state->path) + strlen(msg) + 3)) == NULL) { | |
| 510 state->err = Z_MEM_ERROR; | |
| 511 state->msg = (char *)"out of memory"; | |
| 512 return; | |
| 513 } | |
| 514 strcpy(state->msg, state->path); | |
| 515 strcat(state->msg, ": "); | |
| 516 strcat(state->msg, msg); | |
| 517 return; | |
| 518 } | |
| 519 | |
| 520 #ifndef INT_MAX | |
| 521 /* portably return maximum value for an int (when limits.h presumed not | |
| 522 available) -- we need to do this to cover cases where 2's complement not | |
| 523 used, since C standard permits 1's complement and sign-bit representations, | |
| 524 otherwise we could just use ((unsigned)-1) >> 1 */ | |
| 525 unsigned ZLIB_INTERNAL gz_intmax() | |
| 526 { | |
| 527 unsigned p, q; | |
| 528 | |
| 529 p = 1; | |
| 530 do { | |
| 531 q = p; | |
| 532 p <<= 1; | |
| 533 p++; | |
| 534 } while (p > q); | |
| 535 return q >> 1; | |
| 536 } | |
| 537 #endif |
