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| 1 /** | |
| 2 * xzlib.c: front end for the transparent suport of lzma compression | |
| 3 * at the I/O layer, based on an example file from lzma project | |
| 4 * | |
| 5 * See Copyright for the status of this software. | |
| 6 * | |
| 7 * Anders F Bjorklund <afb@users.sourceforge.net> | |
| 8 */ | |
| 9 #define IN_LIBXML | |
| 10 #include "libxml.h" | |
| 11 #ifdef LIBXML_LZMA_ENABLED | |
| 12 | |
| 13 #include <string.h> | |
| 14 #ifdef HAVE_ERRNO_H | |
| 15 #include <errno.h> | |
| 16 #endif | |
| 17 | |
| 18 | |
| 19 #ifdef HAVE_SYS_TYPES_H | |
| 20 #include <sys/types.h> | |
| 21 #endif | |
| 22 #ifdef HAVE_SYS_STAT_H | |
| 23 #include <sys/stat.h> | |
| 24 #endif | |
| 25 #ifdef HAVE_FCNTL_H | |
| 26 #include <fcntl.h> | |
| 27 #endif | |
| 28 #ifdef HAVE_UNISTD_H | |
| 29 #include <unistd.h> | |
| 30 #endif | |
| 31 #ifdef HAVE_STDLIB_H | |
| 32 #include <stdlib.h> | |
| 33 #endif | |
| 34 #ifdef HAVE_ZLIB_H | |
| 35 #include <zlib.h> | |
| 36 #endif | |
| 37 #ifdef HAVE_LZMA_H | |
| 38 #include <lzma.h> | |
| 39 #endif | |
| 40 | |
| 41 #include "xzlib.h" | |
| 42 #include <libxml/xmlmemory.h> | |
| 43 | |
| 44 /* values for xz_state how */ | |
| 45 #define LOOK 0 /* look for a gzip/lzma header */ | |
| 46 #define COPY 1 /* copy input directly */ | |
| 47 #define GZIP 2 /* decompress a gzip stream */ | |
| 48 #define LZMA 3 /* decompress a lzma stream */ | |
| 49 | |
| 50 /* internal lzma file state data structure */ | |
| 51 typedef struct { | |
| 52 int mode; /* see lzma modes above */ | |
| 53 int fd; /* file descriptor */ | |
| 54 char *path; /* path or fd for error messages */ | |
| 55 uint64_t pos; /* current position in uncompressed data */ | |
| 56 unsigned int size; /* buffer size, zero if not allocated yet */ | |
| 57 unsigned int want; /* requested buffer size, default is BUFSIZ */ | |
| 58 unsigned char *in; /* input buffer */ | |
| 59 unsigned char *out; /* output buffer (double-sized when reading) */ | |
| 60 unsigned char *next; /* next output data to deliver or write */ | |
| 61 unsigned int have; /* amount of output data unused at next */ | |
| 62 int eof; /* true if end of input file reached */ | |
| 63 uint64_t start; /* where the lzma data started, for rewinding */ | |
| 64 uint64_t raw; /* where the raw data started, for seeking */ | |
| 65 int how; /* 0: get header, 1: copy, 2: decompress */ | |
| 66 int direct; /* true if last read direct, false if lzma */ | |
| 67 /* seek request */ | |
| 68 uint64_t skip; /* amount to skip (already rewound if backwards)
*/ | |
| 69 int seek; /* true if seek request pending */ | |
| 70 /* error information */ | |
| 71 int err; /* error code */ | |
| 72 char *msg; /* error message */ | |
| 73 /* lzma stream */ | |
| 74 int init; /* is the iniflate stream initialized */ | |
| 75 lzma_stream strm; /* stream structure in-place (not a pointer) */ | |
| 76 char padding1[32]; /* padding allowing to cope with possible | |
| 77 extensions of above structure without | |
| 78 too much side effect */ | |
| 79 #ifdef HAVE_ZLIB_H | |
| 80 /* zlib inflate or deflate stream */ | |
| 81 z_stream zstrm; /* stream structure in-place (not a pointer) */ | |
| 82 #endif | |
| 83 char padding2[32]; /* padding allowing to cope with possible | |
| 84 extensions of above structure without | |
| 85 too much side effect */ | |
| 86 } xz_state, *xz_statep; | |
| 87 | |
| 88 static void | |
| 89 xz_error(xz_statep state, int err, const char *msg) | |
| 90 { | |
| 91 /* free previously allocated message and clear */ | |
| 92 if (state->msg != NULL) { | |
| 93 if (state->err != LZMA_MEM_ERROR) | |
| 94 xmlFree(state->msg); | |
| 95 state->msg = NULL; | |
| 96 } | |
| 97 | |
| 98 /* set error code, and if no message, then done */ | |
| 99 state->err = err; | |
| 100 if (msg == NULL) | |
| 101 return; | |
| 102 | |
| 103 /* for an out of memory error, save as static string */ | |
| 104 if (err == LZMA_MEM_ERROR) { | |
| 105 state->msg = (char *) msg; | |
| 106 return; | |
| 107 } | |
| 108 | |
| 109 /* construct error message with path */ | |
| 110 if ((state->msg = | |
| 111 xmlMalloc(strlen(state->path) + strlen(msg) + 3)) == NULL) { | |
| 112 state->err = LZMA_MEM_ERROR; | |
| 113 state->msg = (char *) "out of memory"; | |
| 114 return; | |
| 115 } | |
| 116 strcpy(state->msg, state->path); | |
| 117 strcat(state->msg, ": "); | |
| 118 strcat(state->msg, msg); | |
| 119 return; | |
| 120 } | |
| 121 | |
| 122 static void | |
| 123 xz_reset(xz_statep state) | |
| 124 { | |
| 125 state->have = 0; /* no output data available */ | |
| 126 state->eof = 0; /* not at end of file */ | |
| 127 state->how = LOOK; /* look for gzip header */ | |
| 128 state->direct = 1; /* default for empty file */ | |
| 129 state->seek = 0; /* no seek request pending */ | |
| 130 xz_error(state, LZMA_OK, NULL); /* clear error */ | |
| 131 state->pos = 0; /* no uncompressed data yet */ | |
| 132 state->strm.avail_in = 0; /* no input data yet */ | |
| 133 #ifdef HAVE_ZLIB_H | |
| 134 state->zstrm.avail_in = 0; /* no input data yet */ | |
| 135 #endif | |
| 136 } | |
| 137 | |
| 138 static xzFile | |
| 139 xz_open(const char *path, int fd, const char *mode ATTRIBUTE_UNUSED) | |
| 140 { | |
| 141 xz_statep state; | |
| 142 | |
| 143 /* allocate xzFile structure to return */ | |
| 144 state = xmlMalloc(sizeof(xz_state)); | |
| 145 if (state == NULL) | |
| 146 return NULL; | |
| 147 state->size = 0; /* no buffers allocated yet */ | |
| 148 state->want = BUFSIZ; /* requested buffer size */ | |
| 149 state->msg = NULL; /* no error message yet */ | |
| 150 state->init = 0; /* initialization of zlib data */ | |
| 151 | |
| 152 /* save the path name for error messages */ | |
| 153 state->path = xmlMalloc(strlen(path) + 1); | |
| 154 if (state->path == NULL) { | |
| 155 xmlFree(state); | |
| 156 return NULL; | |
| 157 } | |
| 158 strcpy(state->path, path); | |
| 159 | |
| 160 /* open the file with the appropriate mode (or just use fd) */ | |
| 161 state->fd = fd != -1 ? fd : open(path, | |
| 162 #ifdef O_LARGEFILE | |
| 163 O_LARGEFILE | | |
| 164 #endif | |
| 165 #ifdef O_BINARY | |
| 166 O_BINARY | | |
| 167 #endif | |
| 168 O_RDONLY, 0666); | |
| 169 if (state->fd == -1) { | |
| 170 xmlFree(state->path); | |
| 171 xmlFree(state); | |
| 172 return NULL; | |
| 173 } | |
| 174 | |
| 175 /* save the current position for rewinding (only if reading) */ | |
| 176 state->start = lseek(state->fd, 0, SEEK_CUR); | |
| 177 if (state->start == (uint64_t) - 1) | |
| 178 state->start = 0; | |
| 179 | |
| 180 /* initialize stream */ | |
| 181 xz_reset(state); | |
| 182 | |
| 183 /* return stream */ | |
| 184 return (xzFile) state; | |
| 185 } | |
| 186 | |
| 187 static int | |
| 188 xz_compressed(xzFile f) { | |
| 189 xz_statep state; | |
| 190 | |
| 191 if (f == NULL) | |
| 192 return(-1); | |
| 193 state = (xz_statep) f; | |
| 194 if (state->init <= 0) | |
| 195 return(-1); | |
| 196 | |
| 197 switch (state->how) { | |
| 198 case COPY: | |
| 199 return(0); | |
| 200 case GZIP: | |
| 201 case LZMA: | |
| 202 return(1); | |
| 203 } | |
| 204 return(-1); | |
| 205 } | |
| 206 | |
| 207 xzFile | |
| 208 __libxml2_xzopen(const char *path, const char *mode) | |
| 209 { | |
| 210 return xz_open(path, -1, mode); | |
| 211 } | |
| 212 | |
| 213 int | |
| 214 __libxml2_xzcompressed(xzFile f) { | |
| 215 return xz_compressed(f); | |
| 216 } | |
| 217 | |
| 218 xzFile | |
| 219 __libxml2_xzdopen(int fd, const char *mode) | |
| 220 { | |
| 221 char *path; /* identifier for error messages */ | |
| 222 xzFile xz; | |
| 223 | |
| 224 if (fd == -1 || (path = xmlMalloc(7 + 3 * sizeof(int))) == NULL) | |
| 225 return NULL; | |
| 226 sprintf(path, "<fd:%d>", fd); /* for debugging */ | |
| 227 xz = xz_open(path, fd, mode); | |
| 228 xmlFree(path); | |
| 229 return xz; | |
| 230 } | |
| 231 | |
| 232 static int | |
| 233 xz_load(xz_statep state, unsigned char *buf, unsigned int len, | |
| 234 unsigned int *have) | |
| 235 { | |
| 236 int ret; | |
| 237 | |
| 238 *have = 0; | |
| 239 do { | |
| 240 ret = read(state->fd, buf + *have, len - *have); | |
| 241 if (ret <= 0) | |
| 242 break; | |
| 243 *have += ret; | |
| 244 } while (*have < len); | |
| 245 if (ret < 0) { | |
| 246 xz_error(state, -1, strerror(errno)); | |
| 247 return -1; | |
| 248 } | |
| 249 if (ret == 0) | |
| 250 state->eof = 1; | |
| 251 return 0; | |
| 252 } | |
| 253 | |
| 254 static int | |
| 255 xz_avail(xz_statep state) | |
| 256 { | |
| 257 lzma_stream *strm = &(state->strm); | |
| 258 | |
| 259 if (state->err != LZMA_OK) | |
| 260 return -1; | |
| 261 if (state->eof == 0) { | |
| 262 /* avail_in is size_t, which is not necessary sizeof(unsigned) */ | |
| 263 unsigned tmp = strm->avail_in; | |
| 264 | |
| 265 if (xz_load(state, state->in, state->size, &tmp) == -1) { | |
| 266 strm->avail_in = tmp; | |
| 267 return -1; | |
| 268 } | |
| 269 strm->avail_in = tmp; | |
| 270 strm->next_in = state->in; | |
| 271 } | |
| 272 return 0; | |
| 273 } | |
| 274 | |
| 275 #ifdef HAVE_ZLIB_H | |
| 276 static int | |
| 277 xz_avail_zstrm(xz_statep state) | |
| 278 { | |
| 279 int ret; | |
| 280 state->strm.avail_in = state->zstrm.avail_in; | |
| 281 state->strm.next_in = state->zstrm.next_in; | |
| 282 ret = xz_avail(state); | |
| 283 state->zstrm.avail_in = (uInt) state->strm.avail_in; | |
| 284 state->zstrm.next_in = (Bytef *) state->strm.next_in; | |
| 285 return ret; | |
| 286 } | |
| 287 #endif | |
| 288 | |
| 289 static int | |
| 290 is_format_xz(xz_statep state) | |
| 291 { | |
| 292 lzma_stream *strm = &(state->strm); | |
| 293 | |
| 294 return strm->avail_in >= 6 && memcmp(state->in, "\3757zXZ", 6) == 0; | |
| 295 } | |
| 296 | |
| 297 static int | |
| 298 is_format_lzma(xz_statep state) | |
| 299 { | |
| 300 lzma_stream *strm = &(state->strm); | |
| 301 | |
| 302 lzma_filter filter; | |
| 303 lzma_options_lzma *opt; | |
| 304 uint32_t dict_size; | |
| 305 uint64_t uncompressed_size; | |
| 306 size_t i; | |
| 307 | |
| 308 if (strm->avail_in < 13) | |
| 309 return 0; | |
| 310 | |
| 311 filter.id = LZMA_FILTER_LZMA1; | |
| 312 if (lzma_properties_decode(&filter, NULL, state->in, 5) != LZMA_OK) | |
| 313 return 0; | |
| 314 | |
| 315 opt = filter.options; | |
| 316 dict_size = opt->dict_size; | |
| 317 free(opt); /* we can't use xmlFree on a string returned by zlib */ | |
| 318 | |
| 319 /* A hack to ditch tons of false positives: We allow only dictionary | |
| 320 * sizes that are 2^n or 2^n + 2^(n-1) or UINT32_MAX. LZMA_Alone | |
| 321 * created only files with 2^n, but accepts any dictionary size. | |
| 322 * If someone complains, this will be reconsidered. | |
| 323 */ | |
| 324 if (dict_size != UINT32_MAX) { | |
| 325 uint32_t d = dict_size - 1; | |
| 326 | |
| 327 d |= d >> 2; | |
| 328 d |= d >> 3; | |
| 329 d |= d >> 4; | |
| 330 d |= d >> 8; | |
| 331 d |= d >> 16; | |
| 332 ++d; | |
| 333 if (d != dict_size || dict_size == 0) | |
| 334 return 0; | |
| 335 } | |
| 336 | |
| 337 /* Another hack to ditch false positives: Assume that if the | |
| 338 * uncompressed size is known, it must be less than 256 GiB. | |
| 339 * Again, if someone complains, this will be reconsidered. | |
| 340 */ | |
| 341 uncompressed_size = 0; | |
| 342 for (i = 0; i < 8; ++i) | |
| 343 uncompressed_size |= (uint64_t) (state->in[5 + i]) << (i * 8); | |
| 344 | |
| 345 if (uncompressed_size != UINT64_MAX | |
| 346 && uncompressed_size > (UINT64_C(1) << 38)) | |
| 347 return 0; | |
| 348 | |
| 349 return 1; | |
| 350 } | |
| 351 | |
| 352 #ifdef HAVE_ZLIB_H | |
| 353 | |
| 354 /* Get next byte from input, or -1 if end or error. */ | |
| 355 #define NEXT() ((strm->avail_in == 0 && xz_avail(state) == -1) ? -1 : \ | |
| 356 (strm->avail_in == 0 ? -1 : \ | |
| 357 (strm->avail_in--, *(strm->next_in)++))) | |
| 358 /* Same thing, but from zstrm */ | |
| 359 #define NEXTZ() ((strm->avail_in == 0 && xz_avail_zstrm(state) == -1) ? -1 : \ | |
| 360 (strm->avail_in == 0 ? -1 : \ | |
| 361 (strm->avail_in--, *(strm->next_in)++))) | |
| 362 | |
| 363 /* Get a four-byte little-endian integer and return 0 on success and the value | |
| 364 in *ret. Otherwise -1 is returned and *ret is not modified. */ | |
| 365 static int | |
| 366 gz_next4(xz_statep state, unsigned long *ret) | |
| 367 { | |
| 368 int ch; | |
| 369 unsigned long val; | |
| 370 z_streamp strm = &(state->zstrm); | |
| 371 | |
| 372 val = NEXTZ(); | |
| 373 val += (unsigned) NEXTZ() << 8; | |
| 374 val += (unsigned long) NEXTZ() << 16; | |
| 375 ch = NEXTZ(); | |
| 376 if (ch == -1) | |
| 377 return -1; | |
| 378 val += (unsigned long) ch << 24; | |
| 379 *ret = val; | |
| 380 return 0; | |
| 381 } | |
| 382 #endif | |
| 383 | |
| 384 static int | |
| 385 xz_head(xz_statep state) | |
| 386 { | |
| 387 lzma_stream *strm = &(state->strm); | |
| 388 lzma_stream init = LZMA_STREAM_INIT; | |
| 389 int flags; | |
| 390 unsigned len; | |
| 391 | |
| 392 /* allocate read buffers and inflate memory */ | |
| 393 if (state->size == 0) { | |
| 394 /* allocate buffers */ | |
| 395 state->in = xmlMalloc(state->want); | |
| 396 state->out = xmlMalloc(state->want << 1); | |
| 397 if (state->in == NULL || state->out == NULL) { | |
| 398 if (state->out != NULL) | |
| 399 xmlFree(state->out); | |
| 400 if (state->in != NULL) | |
| 401 xmlFree(state->in); | |
| 402 xz_error(state, LZMA_MEM_ERROR, "out of memory"); | |
| 403 return -1; | |
| 404 } | |
| 405 state->size = state->want; | |
| 406 | |
| 407 /* allocate decoder memory */ | |
| 408 state->strm = init; | |
| 409 state->strm.avail_in = 0; | |
| 410 state->strm.next_in = NULL; | |
| 411 if (lzma_auto_decoder(&state->strm, UINT64_MAX, 0) != LZMA_OK) { | |
| 412 xmlFree(state->out); | |
| 413 xmlFree(state->in); | |
| 414 state->size = 0; | |
| 415 xz_error(state, LZMA_MEM_ERROR, "out of memory"); | |
| 416 return -1; | |
| 417 } | |
| 418 #ifdef HAVE_ZLIB_H | |
| 419 /* allocate inflate memory */ | |
| 420 state->zstrm.zalloc = Z_NULL; | |
| 421 state->zstrm.zfree = Z_NULL; | |
| 422 state->zstrm.opaque = Z_NULL; | |
| 423 state->zstrm.avail_in = 0; | |
| 424 state->zstrm.next_in = Z_NULL; | |
| 425 if (state->init == 0) { | |
| 426 if (inflateInit2(&(state->zstrm), -15) != Z_OK) {/* raw inflate */ | |
| 427 xmlFree(state->out); | |
| 428 xmlFree(state->in); | |
| 429 state->size = 0; | |
| 430 xz_error(state, LZMA_MEM_ERROR, "out of memory"); | |
| 431 return -1; | |
| 432 } | |
| 433 state->init = 1; | |
| 434 } | |
| 435 #endif | |
| 436 } | |
| 437 | |
| 438 /* get some data in the input buffer */ | |
| 439 if (strm->avail_in == 0) { | |
| 440 if (xz_avail(state) == -1) | |
| 441 return -1; | |
| 442 if (strm->avail_in == 0) | |
| 443 return 0; | |
| 444 } | |
| 445 | |
| 446 /* look for the xz magic header bytes */ | |
| 447 if (is_format_xz(state) || is_format_lzma(state)) { | |
| 448 state->how = LZMA; | |
| 449 state->direct = 0; | |
| 450 return 0; | |
| 451 } | |
| 452 #ifdef HAVE_ZLIB_H | |
| 453 /* look for the gzip magic header bytes 31 and 139 */ | |
| 454 if (strm->next_in[0] == 31) { | |
| 455 strm->avail_in--; | |
| 456 strm->next_in++; | |
| 457 if (strm->avail_in == 0 && xz_avail(state) == -1) | |
| 458 return -1; | |
| 459 if (strm->avail_in && strm->next_in[0] == 139) { | |
| 460 /* we have a gzip header, woo hoo! */ | |
| 461 strm->avail_in--; | |
| 462 strm->next_in++; | |
| 463 | |
| 464 /* skip rest of header */ | |
| 465 if (NEXT() != 8) { /* compression method */ | |
| 466 xz_error(state, LZMA_DATA_ERROR, | |
| 467 "unknown compression method"); | |
| 468 return -1; | |
| 469 } | |
| 470 flags = NEXT(); | |
| 471 if (flags & 0xe0) { /* reserved flag bits */ | |
| 472 xz_error(state, LZMA_DATA_ERROR, | |
| 473 "unknown header flags set"); | |
| 474 return -1; | |
| 475 } | |
| 476 NEXT(); /* modification time */ | |
| 477 NEXT(); | |
| 478 NEXT(); | |
| 479 NEXT(); | |
| 480 NEXT(); /* extra flags */ | |
| 481 NEXT(); /* operating system */ | |
| 482 if (flags & 4) { /* extra field */ | |
| 483 len = (unsigned) NEXT(); | |
| 484 len += (unsigned) NEXT() << 8; | |
| 485 while (len--) | |
| 486 if (NEXT() < 0) | |
| 487 break; | |
| 488 } | |
| 489 if (flags & 8) /* file name */ | |
| 490 while (NEXT() > 0) ; | |
| 491 if (flags & 16) /* comment */ | |
| 492 while (NEXT() > 0) ; | |
| 493 if (flags & 2) { /* header crc */ | |
| 494 NEXT(); | |
| 495 NEXT(); | |
| 496 } | |
| 497 /* an unexpected end of file is not checked for here -- it will be | |
| 498 * noticed on the first request for uncompressed data */ | |
| 499 | |
| 500 /* set up for decompression */ | |
| 501 inflateReset(&state->zstrm); | |
| 502 state->zstrm.adler = crc32(0L, Z_NULL, 0); | |
| 503 state->how = GZIP; | |
| 504 state->direct = 0; | |
| 505 return 0; | |
| 506 } else { | |
| 507 /* not a gzip file -- save first byte (31) and fall to raw i/o */ | |
| 508 state->out[0] = 31; | |
| 509 state->have = 1; | |
| 510 } | |
| 511 } | |
| 512 #endif | |
| 513 | |
| 514 /* doing raw i/o, save start of raw data for seeking, copy any leftover | |
| 515 * input to output -- this assumes that the output buffer is larger than | |
| 516 * the input buffer, which also assures space for gzungetc() */ | |
| 517 state->raw = state->pos; | |
| 518 state->next = state->out; | |
| 519 if (strm->avail_in) { | |
| 520 memcpy(state->next + state->have, strm->next_in, strm->avail_in); | |
| 521 state->have += strm->avail_in; | |
| 522 strm->avail_in = 0; | |
| 523 } | |
| 524 state->how = COPY; | |
| 525 state->direct = 1; | |
| 526 return 0; | |
| 527 } | |
| 528 | |
| 529 static int | |
| 530 xz_decomp(xz_statep state) | |
| 531 { | |
| 532 int ret; | |
| 533 unsigned had; | |
| 534 unsigned long crc, len; | |
| 535 lzma_stream *strm = &(state->strm); | |
| 536 | |
| 537 lzma_action action = LZMA_RUN; | |
| 538 | |
| 539 /* fill output buffer up to end of deflate stream */ | |
| 540 had = strm->avail_out; | |
| 541 do { | |
| 542 /* get more input for inflate() */ | |
| 543 if (strm->avail_in == 0 && xz_avail(state) == -1) | |
| 544 return -1; | |
| 545 if (strm->avail_in == 0) { | |
| 546 xz_error(state, LZMA_DATA_ERROR, "unexpected end of file"); | |
| 547 return -1; | |
| 548 } | |
| 549 if (state->eof) | |
| 550 action = LZMA_FINISH; | |
| 551 | |
| 552 /* decompress and handle errors */ | |
| 553 #ifdef HAVE_ZLIB_H | |
| 554 if (state->how == GZIP) { | |
| 555 state->zstrm.avail_in = (uInt) state->strm.avail_in; | |
| 556 state->zstrm.next_in = (Bytef *) state->strm.next_in; | |
| 557 state->zstrm.avail_out = (uInt) state->strm.avail_out; | |
| 558 state->zstrm.next_out = (Bytef *) state->strm.next_out; | |
| 559 ret = inflate(&state->zstrm, Z_NO_FLUSH); | |
| 560 if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) { | |
| 561 xz_error(state, Z_STREAM_ERROR, | |
| 562 "internal error: inflate stream corrupt"); | |
| 563 return -1; | |
| 564 } | |
| 565 if (ret == Z_MEM_ERROR) | |
| 566 ret = LZMA_MEM_ERROR; | |
| 567 if (ret == Z_DATA_ERROR) | |
| 568 ret = LZMA_DATA_ERROR; | |
| 569 if (ret == Z_STREAM_END) | |
| 570 ret = LZMA_STREAM_END; | |
| 571 state->strm.avail_in = state->zstrm.avail_in; | |
| 572 state->strm.next_in = state->zstrm.next_in; | |
| 573 state->strm.avail_out = state->zstrm.avail_out; | |
| 574 state->strm.next_out = state->zstrm.next_out; | |
| 575 } else /* state->how == LZMA */ | |
| 576 #endif | |
| 577 ret = lzma_code(strm, action); | |
| 578 if (ret == LZMA_MEM_ERROR) { | |
| 579 xz_error(state, LZMA_MEM_ERROR, "out of memory"); | |
| 580 return -1; | |
| 581 } | |
| 582 if (ret == LZMA_DATA_ERROR) { | |
| 583 xz_error(state, LZMA_DATA_ERROR, "compressed data error"); | |
| 584 return -1; | |
| 585 } | |
| 586 if (ret == LZMA_PROG_ERROR) { | |
| 587 xz_error(state, LZMA_PROG_ERROR, "compression error"); | |
| 588 return -1; | |
| 589 } | |
| 590 } while (strm->avail_out && ret != LZMA_STREAM_END); | |
| 591 | |
| 592 /* update available output and crc check value */ | |
| 593 state->have = had - strm->avail_out; | |
| 594 state->next = strm->next_out - state->have; | |
| 595 #ifdef HAVE_ZLIB_H | |
| 596 state->zstrm.adler = | |
| 597 crc32(state->zstrm.adler, state->next, state->have); | |
| 598 #endif | |
| 599 | |
| 600 if (ret == LZMA_STREAM_END) { | |
| 601 #ifdef HAVE_ZLIB_H | |
| 602 if (state->how == GZIP) { | |
| 603 if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) { | |
| 604 xz_error(state, LZMA_DATA_ERROR, "unexpected end of file"); | |
| 605 return -1; | |
| 606 } | |
| 607 if (crc != state->zstrm.adler) { | |
| 608 xz_error(state, LZMA_DATA_ERROR, "incorrect data check"); | |
| 609 return -1; | |
| 610 } | |
| 611 if (len != (state->zstrm.total_out & 0xffffffffL)) { | |
| 612 xz_error(state, LZMA_DATA_ERROR, "incorrect length check"); | |
| 613 return -1; | |
| 614 } | |
| 615 state->strm.avail_in = 0; | |
| 616 state->strm.next_in = NULL; | |
| 617 state->strm.avail_out = 0; | |
| 618 state->strm.next_out = NULL; | |
| 619 } else | |
| 620 #endif | |
| 621 if (strm->avail_in != 0 || !state->eof) { | |
| 622 xz_error(state, LZMA_DATA_ERROR, "trailing garbage"); | |
| 623 return -1; | |
| 624 } | |
| 625 state->how = LOOK; /* ready for next stream, once have is 0 (leave | |
| 626 * state->direct unchanged to remember how) */ | |
| 627 } | |
| 628 | |
| 629 /* good decompression */ | |
| 630 return 0; | |
| 631 } | |
| 632 | |
| 633 static int | |
| 634 xz_make(xz_statep state) | |
| 635 { | |
| 636 lzma_stream *strm = &(state->strm); | |
| 637 | |
| 638 if (state->how == LOOK) { /* look for lzma / gzip header */ | |
| 639 if (xz_head(state) == -1) | |
| 640 return -1; | |
| 641 if (state->have) /* got some data from xz_head() */ | |
| 642 return 0; | |
| 643 } | |
| 644 if (state->how == COPY) { /* straight copy */ | |
| 645 if (xz_load(state, state->out, state->size << 1, &(state->have)) == | |
| 646 -1) | |
| 647 return -1; | |
| 648 state->next = state->out; | |
| 649 } else if (state->how == LZMA || state->how == GZIP) { /* decompress */ | |
| 650 strm->avail_out = state->size << 1; | |
| 651 strm->next_out = state->out; | |
| 652 if (xz_decomp(state) == -1) | |
| 653 return -1; | |
| 654 } | |
| 655 return 0; | |
| 656 } | |
| 657 | |
| 658 static int | |
| 659 xz_skip(xz_statep state, uint64_t len) | |
| 660 { | |
| 661 unsigned n; | |
| 662 | |
| 663 /* skip over len bytes or reach end-of-file, whichever comes first */ | |
| 664 while (len) | |
| 665 /* skip over whatever is in output buffer */ | |
| 666 if (state->have) { | |
| 667 n = (uint64_t) state->have > len ? | |
| 668 (unsigned) len : state->have; | |
| 669 state->have -= n; | |
| 670 state->next += n; | |
| 671 state->pos += n; | |
| 672 len -= n; | |
| 673 } | |
| 674 | |
| 675 /* output buffer empty -- return if we're at the end of the input */ | |
| 676 else if (state->eof && state->strm.avail_in == 0) | |
| 677 break; | |
| 678 | |
| 679 /* need more data to skip -- load up output buffer */ | |
| 680 else { | |
| 681 /* get more output, looking for header if required */ | |
| 682 if (xz_make(state) == -1) | |
| 683 return -1; | |
| 684 } | |
| 685 return 0; | |
| 686 } | |
| 687 | |
| 688 int | |
| 689 __libxml2_xzread(xzFile file, void *buf, unsigned len) | |
| 690 { | |
| 691 unsigned got, n; | |
| 692 xz_statep state; | |
| 693 lzma_stream *strm; | |
| 694 | |
| 695 /* get internal structure */ | |
| 696 if (file == NULL) | |
| 697 return -1; | |
| 698 state = (xz_statep) file; | |
| 699 strm = &(state->strm); | |
| 700 | |
| 701 /* check that we're reading and that there's no error */ | |
| 702 if (state->err != LZMA_OK) | |
| 703 return -1; | |
| 704 | |
| 705 /* since an int is returned, make sure len fits in one, otherwise return | |
| 706 * with an error (this avoids the flaw in the interface) */ | |
| 707 if ((int) len < 0) { | |
| 708 xz_error(state, LZMA_BUF_ERROR, | |
| 709 "requested length does not fit in int"); | |
| 710 return -1; | |
| 711 } | |
| 712 | |
| 713 /* if len is zero, avoid unnecessary operations */ | |
| 714 if (len == 0) | |
| 715 return 0; | |
| 716 | |
| 717 /* process a skip request */ | |
| 718 if (state->seek) { | |
| 719 state->seek = 0; | |
| 720 if (xz_skip(state, state->skip) == -1) | |
| 721 return -1; | |
| 722 } | |
| 723 | |
| 724 /* get len bytes to buf, or less than len if at the end */ | |
| 725 got = 0; | |
| 726 do { | |
| 727 /* first just try copying data from the output buffer */ | |
| 728 if (state->have) { | |
| 729 n = state->have > len ? len : state->have; | |
| 730 memcpy(buf, state->next, n); | |
| 731 state->next += n; | |
| 732 state->have -= n; | |
| 733 } | |
| 734 | |
| 735 /* output buffer empty -- return if we're at the end of the input */ | |
| 736 else if (state->eof && strm->avail_in == 0) | |
| 737 break; | |
| 738 | |
| 739 /* need output data -- for small len or new stream load up our output | |
| 740 * buffer */ | |
| 741 else if (state->how == LOOK || len < (state->size << 1)) { | |
| 742 /* get more output, looking for header if required */ | |
| 743 if (xz_make(state) == -1) | |
| 744 return -1; | |
| 745 continue; /* no progress yet -- go back to memcpy() above
*/ | |
| 746 /* the copy above assures that we will leave with space in the | |
| 747 * output buffer, allowing at least one gzungetc() to succeed */ | |
| 748 } | |
| 749 | |
| 750 /* large len -- read directly into user buffer */ | |
| 751 else if (state->how == COPY) { /* read directly */ | |
| 752 if (xz_load(state, buf, len, &n) == -1) | |
| 753 return -1; | |
| 754 } | |
| 755 | |
| 756 /* large len -- decompress directly into user buffer */ | |
| 757 else { /* state->how == LZMA */ | |
| 758 strm->avail_out = len; | |
| 759 strm->next_out = buf; | |
| 760 if (xz_decomp(state) == -1) | |
| 761 return -1; | |
| 762 n = state->have; | |
| 763 state->have = 0; | |
| 764 } | |
| 765 | |
| 766 /* update progress */ | |
| 767 len -= n; | |
| 768 buf = (char *) buf + n; | |
| 769 got += n; | |
| 770 state->pos += n; | |
| 771 } while (len); | |
| 772 | |
| 773 /* return number of bytes read into user buffer (will fit in int) */ | |
| 774 return (int) got; | |
| 775 } | |
| 776 | |
| 777 int | |
| 778 __libxml2_xzclose(xzFile file) | |
| 779 { | |
| 780 int ret; | |
| 781 xz_statep state; | |
| 782 | |
| 783 /* get internal structure */ | |
| 784 if (file == NULL) | |
| 785 return LZMA_DATA_ERROR; | |
| 786 state = (xz_statep) file; | |
| 787 | |
| 788 /* free memory and close file */ | |
| 789 if (state->size) { | |
| 790 lzma_end(&(state->strm)); | |
| 791 #ifdef HAVE_ZLIB_H | |
| 792 if (state->init == 1) | |
| 793 inflateEnd(&(state->zstrm)); | |
| 794 state->init = 0; | |
| 795 #endif | |
| 796 xmlFree(state->out); | |
| 797 xmlFree(state->in); | |
| 798 } | |
| 799 xmlFree(state->path); | |
| 800 ret = close(state->fd); | |
| 801 xmlFree(state); | |
| 802 return ret ? ret : LZMA_OK; | |
| 803 } | |
| 804 #endif /* LIBXML_LZMA_ENABLED */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2804483002:
Check in the libxml roll script. (Closed)
