1 /* $NetBSD: gzip.c,v 1.116 2018/10/27 11:39:12 skrll Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause 5 * 6 * Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008, 2009, 2010, 2011, 2015, 2017 7 * Matthew R. Green 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 */ 32 33 #include <sys/cdefs.h> 34 #ifndef lint 35 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008,\ 36 2009, 2010, 2011, 2015, 2017 Matthew R. Green. All rights reserved."); 37 __FBSDID("$FreeBSD$"); 38 #endif /* not lint */ 39 40 /* 41 * gzip.c -- GPL free gzip using zlib. 42 * 43 * RFC 1950 covers the zlib format 44 * RFC 1951 covers the deflate format 45 * RFC 1952 covers the gzip format 46 * 47 * TODO: 48 * - use mmap where possible 49 * - make bzip2/compress -v/-t/-l support work as well as possible 50 */ 51 52 #include <sys/endian.h> 53 #include <sys/param.h> 54 #include <sys/stat.h> 55 #include <sys/time.h> 56 57 #include <inttypes.h> 58 #include <unistd.h> 59 #include <stdio.h> 60 #include <string.h> 61 #include <stdlib.h> 62 #include <err.h> 63 #include <errno.h> 64 #include <fcntl.h> 65 #include <zlib.h> 66 #include <fts.h> 67 #include <libgen.h> 68 #include <stdarg.h> 69 #include <getopt.h> 70 #include <time.h> 71 72 /* what type of file are we dealing with */ 73 enum filetype { 74 FT_GZIP, 75 #ifndef NO_BZIP2_SUPPORT 76 FT_BZIP2, 77 #endif 78 #ifndef NO_COMPRESS_SUPPORT 79 FT_Z, 80 #endif 81 #ifndef NO_PACK_SUPPORT 82 FT_PACK, 83 #endif 84 #ifndef NO_XZ_SUPPORT 85 FT_XZ, 86 #endif 87 #ifndef NO_LZ_SUPPORT 88 FT_LZ, 89 #endif 90 #ifndef NO_ZSTD_SUPPORT 91 FT_ZSTD, 92 #endif 93 FT_LAST, 94 FT_UNKNOWN 95 }; 96 97 #ifndef NO_BZIP2_SUPPORT 98 #include <bzlib.h> 99 100 #define BZ2_SUFFIX ".bz2" 101 #define BZIP2_MAGIC "BZh" 102 #endif 103 104 #ifndef NO_COMPRESS_SUPPORT 105 #define Z_SUFFIX ".Z" 106 #define Z_MAGIC "\037\235" 107 #endif 108 109 #ifndef NO_PACK_SUPPORT 110 #define PACK_MAGIC "\037\036" 111 #endif 112 113 #ifndef NO_XZ_SUPPORT 114 #include <lzma.h> 115 #define XZ_SUFFIX ".xz" 116 #define XZ_MAGIC "\3757zXZ" 117 #endif 118 119 #ifndef NO_LZ_SUPPORT 120 #define LZ_SUFFIX ".lz" 121 #define LZ_MAGIC "LZIP" 122 #endif 123 124 #ifndef NO_ZSTD_SUPPORT 125 #include <zstd.h> 126 #define ZSTD_SUFFIX ".zst" 127 #define ZSTD_MAGIC "\050\265\057\375" 128 #endif 129 130 #define GZ_SUFFIX ".gz" 131 132 #define BUFLEN (64 * 1024) 133 134 #define GZIP_MAGIC0 0x1F 135 #define GZIP_MAGIC1 0x8B 136 #define GZIP_OMAGIC1 0x9E 137 138 #define GZIP_TIMESTAMP (off_t)4 139 #define GZIP_ORIGNAME (off_t)10 140 141 #define HEAD_CRC 0x02 142 #define EXTRA_FIELD 0x04 143 #define ORIG_NAME 0x08 144 #define COMMENT 0x10 145 146 #define OS_CODE 3 /* Unix */ 147 148 typedef struct { 149 const char *zipped; 150 int ziplen; 151 const char *normal; /* for unzip - must not be longer than zipped */ 152 } suffixes_t; 153 static suffixes_t suffixes[] = { 154 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N} 155 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */ 156 SUFFIX(GZ_SUFFIX, ""), 157 SUFFIX(".z", ""), 158 SUFFIX("-gz", ""), 159 SUFFIX("-z", ""), 160 SUFFIX("_z", ""), 161 SUFFIX(".taz", ".tar"), 162 SUFFIX(".tgz", ".tar"), 163 #ifndef NO_BZIP2_SUPPORT 164 SUFFIX(BZ2_SUFFIX, ""), 165 SUFFIX(".tbz", ".tar"), 166 SUFFIX(".tbz2", ".tar"), 167 #endif 168 #ifndef NO_COMPRESS_SUPPORT 169 SUFFIX(Z_SUFFIX, ""), 170 #endif 171 #ifndef NO_XZ_SUPPORT 172 SUFFIX(XZ_SUFFIX, ""), 173 #endif 174 #ifndef NO_LZ_SUPPORT 175 SUFFIX(LZ_SUFFIX, ""), 176 #endif 177 #ifndef NO_ZSTD_SUPPORT 178 SUFFIX(ZSTD_SUFFIX, ""), 179 #endif 180 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */ 181 #undef SUFFIX 182 }; 183 #define NUM_SUFFIXES (nitems(suffixes)) 184 #define SUFFIX_MAXLEN 30 185 186 static const char gzip_version[] = "FreeBSD gzip 20190107"; 187 188 static const char gzip_copyright[] = \ 189 " Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n" 190 " All rights reserved.\n" 191 "\n" 192 " Redistribution and use in source and binary forms, with or without\n" 193 " modification, are permitted provided that the following conditions\n" 194 " are met:\n" 195 " 1. Redistributions of source code must retain the above copyright\n" 196 " notice, this list of conditions and the following disclaimer.\n" 197 " 2. Redistributions in binary form must reproduce the above copyright\n" 198 " notice, this list of conditions and the following disclaimer in the\n" 199 " documentation and/or other materials provided with the distribution.\n" 200 "\n" 201 " THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n" 202 " IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n" 203 " OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n" 204 " IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n" 205 " INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n" 206 " BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n" 207 " LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n" 208 " AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n" 209 " OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n" 210 " OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n" 211 " SUCH DAMAGE."; 212 213 static int cflag; /* stdout mode */ 214 static int dflag; /* decompress mode */ 215 static int lflag; /* list mode */ 216 static int numflag = 6; /* gzip -1..-9 value */ 217 218 static const char *remove_file = NULL; /* file to be removed upon SIGINT */ 219 220 static int fflag; /* force mode */ 221 static int kflag; /* don't delete input files */ 222 static int nflag; /* don't save name/timestamp */ 223 static int Nflag; /* don't restore name/timestamp */ 224 static int qflag; /* quiet mode */ 225 static int rflag; /* recursive mode */ 226 static int tflag; /* test */ 227 static int vflag; /* verbose mode */ 228 static sig_atomic_t print_info = 0; 229 230 static int exit_value = 0; /* exit value */ 231 232 static const char *infile; /* name of file coming in */ 233 234 static void maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2; 235 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \ 236 !defined(NO_XZ_SUPPORT) || !defined(NO_ZSTD_SUPPORT) 237 static void maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2; 238 #endif 239 static void maybe_warn(const char *fmt, ...) __printflike(1, 2); 240 static void maybe_warnx(const char *fmt, ...) __printflike(1, 2); 241 static enum filetype file_gettype(u_char *); 242 static off_t gz_compress(int, int, off_t *, const char *, uint32_t); 243 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *); 244 static off_t file_compress(char *, char *, size_t); 245 static off_t file_uncompress(char *, char *, size_t); 246 static void handle_pathname(char *); 247 static void handle_file(char *, struct stat *); 248 static void handle_stdin(void); 249 static void handle_stdout(void); 250 static void print_ratio(off_t, off_t, FILE *); 251 static void print_list(int fd, off_t, const char *, time_t); 252 static void usage(void) __dead2; 253 static void display_version(void) __dead2; 254 static void display_license(void); 255 static const suffixes_t *check_suffix(char *, int); 256 static ssize_t read_retry(int, void *, size_t); 257 static ssize_t write_retry(int, const void *, size_t); 258 static void print_list_out(off_t, off_t, const char*); 259 260 static void infile_set(const char *newinfile, off_t total); 261 262 static off_t infile_total; /* total expected to read/write */ 263 static off_t infile_current; /* current read/write */ 264 265 static void check_siginfo(void); 266 static off_t cat_fd(unsigned char *, size_t, off_t *, int fd); 267 static void prepend_gzip(char *, int *, char ***); 268 static void handle_dir(char *); 269 static void print_verbage(const char *, const char *, off_t, off_t); 270 static void print_test(const char *, int); 271 static void copymodes(int fd, const struct stat *, const char *file); 272 static int check_outfile(const char *outfile); 273 static void setup_signals(void); 274 static void infile_newdata(size_t newdata); 275 static void infile_clear(void); 276 277 #ifndef NO_BZIP2_SUPPORT 278 static off_t unbzip2(int, int, char *, size_t, off_t *); 279 #endif 280 281 #ifndef NO_COMPRESS_SUPPORT 282 static FILE *zdopen(int); 283 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *); 284 #endif 285 286 #ifndef NO_PACK_SUPPORT 287 static off_t unpack(int, int, char *, size_t, off_t *); 288 #endif 289 290 #ifndef NO_XZ_SUPPORT 291 static off_t unxz(int, int, char *, size_t, off_t *); 292 static off_t unxz_len(int); 293 #endif 294 295 #ifndef NO_LZ_SUPPORT 296 static off_t unlz(int, int, char *, size_t, off_t *); 297 #endif 298 299 #ifndef NO_ZSTD_SUPPORT 300 static off_t unzstd(int, int, char *, size_t, off_t *); 301 #endif 302 303 static const struct option longopts[] = { 304 { "stdout", no_argument, 0, 'c' }, 305 { "to-stdout", no_argument, 0, 'c' }, 306 { "decompress", no_argument, 0, 'd' }, 307 { "uncompress", no_argument, 0, 'd' }, 308 { "force", no_argument, 0, 'f' }, 309 { "help", no_argument, 0, 'h' }, 310 { "keep", no_argument, 0, 'k' }, 311 { "list", no_argument, 0, 'l' }, 312 { "no-name", no_argument, 0, 'n' }, 313 { "name", no_argument, 0, 'N' }, 314 { "quiet", no_argument, 0, 'q' }, 315 { "recursive", no_argument, 0, 'r' }, 316 { "suffix", required_argument, 0, 'S' }, 317 { "test", no_argument, 0, 't' }, 318 { "verbose", no_argument, 0, 'v' }, 319 { "version", no_argument, 0, 'V' }, 320 { "fast", no_argument, 0, '1' }, 321 { "best", no_argument, 0, '9' }, 322 { "ascii", no_argument, 0, 'a' }, 323 { "license", no_argument, 0, 'L' }, 324 { NULL, no_argument, 0, 0 }, 325 }; 326 327 int 328 main(int argc, char **argv) 329 { 330 const char *progname = getprogname(); 331 char *gzip; 332 int len; 333 int ch; 334 335 setup_signals(); 336 337 if ((gzip = getenv("GZIP")) != NULL) 338 prepend_gzip(gzip, &argc, &argv); 339 340 /* 341 * XXX 342 * handle being called `gunzip', `zcat' and `gzcat' 343 */ 344 if (strcmp(progname, "gunzip") == 0) 345 dflag = 1; 346 else if (strcmp(progname, "zcat") == 0 || 347 strcmp(progname, "gzcat") == 0) 348 dflag = cflag = 1; 349 350 #define OPT_LIST "123456789acdfhklLNnqrS:tVv" 351 352 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) { 353 switch (ch) { 354 case '1': case '2': case '3': 355 case '4': case '5': case '6': 356 case '7': case '8': case '9': 357 numflag = ch - '0'; 358 break; 359 case 'c': 360 cflag = 1; 361 break; 362 case 'd': 363 dflag = 1; 364 break; 365 case 'l': 366 lflag = 1; 367 dflag = 1; 368 break; 369 case 'V': 370 display_version(); 371 /* NOTREACHED */ 372 case 'a': 373 fprintf(stderr, "%s: option --ascii ignored on this system\n", progname); 374 break; 375 case 'f': 376 fflag = 1; 377 break; 378 case 'k': 379 kflag = 1; 380 break; 381 case 'L': 382 display_license(); 383 /* NOT REACHED */ 384 case 'N': 385 nflag = 0; 386 Nflag = 1; 387 break; 388 case 'n': 389 nflag = 1; 390 Nflag = 0; 391 break; 392 case 'q': 393 qflag = 1; 394 break; 395 case 'r': 396 rflag = 1; 397 break; 398 case 'S': 399 len = strlen(optarg); 400 if (len != 0) { 401 if (len > SUFFIX_MAXLEN) 402 errx(1, "incorrect suffix: '%s': too long", optarg); 403 suffixes[0].zipped = optarg; 404 suffixes[0].ziplen = len; 405 } else { 406 suffixes[NUM_SUFFIXES - 1].zipped = ""; 407 suffixes[NUM_SUFFIXES - 1].ziplen = 0; 408 } 409 break; 410 case 't': 411 cflag = 1; 412 tflag = 1; 413 dflag = 1; 414 break; 415 case 'v': 416 vflag = 1; 417 break; 418 default: 419 usage(); 420 /* NOTREACHED */ 421 } 422 } 423 argv += optind; 424 argc -= optind; 425 426 if (argc == 0) { 427 if (dflag) /* stdin mode */ 428 handle_stdin(); 429 else /* stdout mode */ 430 handle_stdout(); 431 } else { 432 do { 433 handle_pathname(argv[0]); 434 } while (*++argv); 435 } 436 if (qflag == 0 && lflag && argc > 1) 437 print_list(-1, 0, "(totals)", 0); 438 exit(exit_value); 439 } 440 441 /* maybe print a warning */ 442 void 443 maybe_warn(const char *fmt, ...) 444 { 445 va_list ap; 446 447 if (qflag == 0) { 448 va_start(ap, fmt); 449 vwarn(fmt, ap); 450 va_end(ap); 451 } 452 if (exit_value == 0) 453 exit_value = 1; 454 } 455 456 /* ... without an errno. */ 457 void 458 maybe_warnx(const char *fmt, ...) 459 { 460 va_list ap; 461 462 if (qflag == 0) { 463 va_start(ap, fmt); 464 vwarnx(fmt, ap); 465 va_end(ap); 466 } 467 if (exit_value == 0) 468 exit_value = 1; 469 } 470 471 /* maybe print an error */ 472 void 473 maybe_err(const char *fmt, ...) 474 { 475 va_list ap; 476 477 if (qflag == 0) { 478 va_start(ap, fmt); 479 vwarn(fmt, ap); 480 va_end(ap); 481 } 482 exit(2); 483 } 484 485 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \ 486 !defined(NO_XZ_SUPPORT) || !defined(NO_ZSTD_SUPPORT) 487 /* ... without an errno. */ 488 void 489 maybe_errx(const char *fmt, ...) 490 { 491 va_list ap; 492 493 if (qflag == 0) { 494 va_start(ap, fmt); 495 vwarnx(fmt, ap); 496 va_end(ap); 497 } 498 exit(2); 499 } 500 #endif 501 502 /* split up $GZIP and prepend it to the argument list */ 503 static void 504 prepend_gzip(char *gzip, int *argc, char ***argv) 505 { 506 char *s, **nargv, **ac; 507 int nenvarg = 0, i; 508 509 /* scan how many arguments there are */ 510 for (s = gzip;;) { 511 while (*s == ' ' || *s == '\t') 512 s++; 513 if (*s == 0) 514 goto count_done; 515 nenvarg++; 516 while (*s != ' ' && *s != '\t') 517 if (*s++ == 0) 518 goto count_done; 519 } 520 count_done: 521 /* punt early */ 522 if (nenvarg == 0) 523 return; 524 525 *argc += nenvarg; 526 ac = *argv; 527 528 nargv = (char **)malloc((*argc + 1) * sizeof(char *)); 529 if (nargv == NULL) 530 maybe_err("malloc"); 531 532 /* stash this away */ 533 *argv = nargv; 534 535 /* copy the program name first */ 536 i = 0; 537 nargv[i++] = *(ac++); 538 539 /* take a copy of $GZIP and add it to the array */ 540 s = strdup(gzip); 541 if (s == NULL) 542 maybe_err("strdup"); 543 for (;;) { 544 /* Skip whitespaces. */ 545 while (*s == ' ' || *s == '\t') 546 s++; 547 if (*s == 0) 548 goto copy_done; 549 nargv[i++] = s; 550 /* Find the end of this argument. */ 551 while (*s != ' ' && *s != '\t') 552 if (*s++ == 0) 553 /* Argument followed by NUL. */ 554 goto copy_done; 555 /* Terminate by overwriting ' ' or '\t' with NUL. */ 556 *s++ = 0; 557 } 558 copy_done: 559 560 /* copy the original arguments and a NULL */ 561 while (*ac) 562 nargv[i++] = *(ac++); 563 nargv[i] = NULL; 564 } 565 566 /* compress input to output. Return bytes read, -1 on error */ 567 static off_t 568 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime) 569 { 570 z_stream z; 571 char *outbufp, *inbufp; 572 off_t in_tot = 0, out_tot = 0; 573 ssize_t in_size; 574 int i, error; 575 uLong crc; 576 577 outbufp = malloc(BUFLEN); 578 inbufp = malloc(BUFLEN); 579 if (outbufp == NULL || inbufp == NULL) { 580 maybe_err("malloc failed"); 581 goto out; 582 } 583 584 memset(&z, 0, sizeof z); 585 z.zalloc = Z_NULL; 586 z.zfree = Z_NULL; 587 z.opaque = 0; 588 589 if (nflag != 0) { 590 mtime = 0; 591 origname = ""; 592 } 593 594 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s", 595 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 596 *origname ? ORIG_NAME : 0, 597 mtime & 0xff, 598 (mtime >> 8) & 0xff, 599 (mtime >> 16) & 0xff, 600 (mtime >> 24) & 0xff, 601 numflag == 1 ? 4 : numflag == 9 ? 2 : 0, 602 OS_CODE, origname); 603 if (i >= BUFLEN) 604 /* this need PATH_MAX > BUFLEN ... */ 605 maybe_err("snprintf"); 606 if (*origname) 607 i++; 608 609 z.next_out = (unsigned char *)outbufp + i; 610 z.avail_out = BUFLEN - i; 611 612 error = deflateInit2(&z, numflag, Z_DEFLATED, 613 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY); 614 if (error != Z_OK) { 615 maybe_warnx("deflateInit2 failed"); 616 in_tot = -1; 617 goto out; 618 } 619 620 crc = crc32(0L, Z_NULL, 0); 621 for (;;) { 622 if (z.avail_out == 0) { 623 if (write_retry(out, outbufp, BUFLEN) != BUFLEN) { 624 maybe_warn("write"); 625 out_tot = -1; 626 goto out; 627 } 628 629 out_tot += BUFLEN; 630 z.next_out = (unsigned char *)outbufp; 631 z.avail_out = BUFLEN; 632 } 633 634 if (z.avail_in == 0) { 635 in_size = read(in, inbufp, BUFLEN); 636 if (in_size < 0) { 637 maybe_warn("read"); 638 in_tot = -1; 639 goto out; 640 } 641 if (in_size == 0) 642 break; 643 infile_newdata(in_size); 644 645 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size); 646 in_tot += in_size; 647 z.next_in = (unsigned char *)inbufp; 648 z.avail_in = in_size; 649 } 650 651 error = deflate(&z, Z_NO_FLUSH); 652 if (error != Z_OK && error != Z_STREAM_END) { 653 maybe_warnx("deflate failed"); 654 in_tot = -1; 655 goto out; 656 } 657 } 658 659 /* clean up */ 660 for (;;) { 661 size_t len; 662 ssize_t w; 663 664 error = deflate(&z, Z_FINISH); 665 if (error != Z_OK && error != Z_STREAM_END) { 666 maybe_warnx("deflate failed"); 667 in_tot = -1; 668 goto out; 669 } 670 671 len = (char *)z.next_out - outbufp; 672 673 w = write_retry(out, outbufp, len); 674 if (w == -1 || (size_t)w != len) { 675 maybe_warn("write"); 676 out_tot = -1; 677 goto out; 678 } 679 out_tot += len; 680 z.next_out = (unsigned char *)outbufp; 681 z.avail_out = BUFLEN; 682 683 if (error == Z_STREAM_END) 684 break; 685 } 686 687 if (deflateEnd(&z) != Z_OK) { 688 maybe_warnx("deflateEnd failed"); 689 in_tot = -1; 690 goto out; 691 } 692 693 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c", 694 (int)crc & 0xff, 695 (int)(crc >> 8) & 0xff, 696 (int)(crc >> 16) & 0xff, 697 (int)(crc >> 24) & 0xff, 698 (int)in_tot & 0xff, 699 (int)(in_tot >> 8) & 0xff, 700 (int)(in_tot >> 16) & 0xff, 701 (int)(in_tot >> 24) & 0xff); 702 if (i != 8) 703 maybe_err("snprintf"); 704 if (write_retry(out, outbufp, i) != i) { 705 maybe_warn("write"); 706 in_tot = -1; 707 } else 708 out_tot += i; 709 710 out: 711 if (inbufp != NULL) 712 free(inbufp); 713 if (outbufp != NULL) 714 free(outbufp); 715 if (gsizep) 716 *gsizep = out_tot; 717 return in_tot; 718 } 719 720 /* 721 * uncompress input to output then close the input. return the 722 * uncompressed size written, and put the compressed sized read 723 * into `*gsizep'. 724 */ 725 static off_t 726 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep, 727 const char *filename) 728 { 729 z_stream z; 730 char *outbufp, *inbufp; 731 off_t out_tot = -1, in_tot = 0; 732 uint32_t out_sub_tot = 0; 733 enum { 734 GZSTATE_MAGIC0, 735 GZSTATE_MAGIC1, 736 GZSTATE_METHOD, 737 GZSTATE_FLAGS, 738 GZSTATE_SKIPPING, 739 GZSTATE_EXTRA, 740 GZSTATE_EXTRA2, 741 GZSTATE_EXTRA3, 742 GZSTATE_ORIGNAME, 743 GZSTATE_COMMENT, 744 GZSTATE_HEAD_CRC1, 745 GZSTATE_HEAD_CRC2, 746 GZSTATE_INIT, 747 GZSTATE_READ, 748 GZSTATE_CRC, 749 GZSTATE_LEN, 750 } state = GZSTATE_MAGIC0; 751 int flags = 0, skip_count = 0; 752 int error = Z_STREAM_ERROR, done_reading = 0; 753 uLong crc = 0; 754 ssize_t wr; 755 int needmore = 0; 756 757 #define ADVANCE() { z.next_in++; z.avail_in--; } 758 759 if ((outbufp = malloc(BUFLEN)) == NULL) { 760 maybe_err("malloc failed"); 761 goto out2; 762 } 763 if ((inbufp = malloc(BUFLEN)) == NULL) { 764 maybe_err("malloc failed"); 765 goto out1; 766 } 767 768 memset(&z, 0, sizeof z); 769 z.avail_in = prelen; 770 z.next_in = (unsigned char *)pre; 771 z.avail_out = BUFLEN; 772 z.next_out = (unsigned char *)outbufp; 773 z.zalloc = NULL; 774 z.zfree = NULL; 775 z.opaque = 0; 776 777 in_tot = prelen; 778 out_tot = 0; 779 780 for (;;) { 781 check_siginfo(); 782 if ((z.avail_in == 0 || needmore) && done_reading == 0) { 783 ssize_t in_size; 784 785 if (z.avail_in > 0) { 786 memmove(inbufp, z.next_in, z.avail_in); 787 } 788 z.next_in = (unsigned char *)inbufp; 789 in_size = read(in, z.next_in + z.avail_in, 790 BUFLEN - z.avail_in); 791 792 if (in_size == -1) { 793 maybe_warn("failed to read stdin"); 794 goto stop_and_fail; 795 } else if (in_size == 0) { 796 done_reading = 1; 797 } 798 infile_newdata(in_size); 799 800 z.avail_in += in_size; 801 needmore = 0; 802 803 in_tot += in_size; 804 } 805 if (z.avail_in == 0) { 806 if (done_reading && state != GZSTATE_MAGIC0) { 807 maybe_warnx("%s: unexpected end of file", 808 filename); 809 goto stop_and_fail; 810 } 811 goto stop; 812 } 813 switch (state) { 814 case GZSTATE_MAGIC0: 815 if (*z.next_in != GZIP_MAGIC0) { 816 if (in_tot > 0) { 817 maybe_warnx("%s: trailing garbage " 818 "ignored", filename); 819 exit_value = 2; 820 goto stop; 821 } 822 maybe_warnx("input not gziped (MAGIC0)"); 823 goto stop_and_fail; 824 } 825 ADVANCE(); 826 state++; 827 out_sub_tot = 0; 828 crc = crc32(0L, Z_NULL, 0); 829 break; 830 831 case GZSTATE_MAGIC1: 832 if (*z.next_in != GZIP_MAGIC1 && 833 *z.next_in != GZIP_OMAGIC1) { 834 maybe_warnx("input not gziped (MAGIC1)"); 835 goto stop_and_fail; 836 } 837 ADVANCE(); 838 state++; 839 break; 840 841 case GZSTATE_METHOD: 842 if (*z.next_in != Z_DEFLATED) { 843 maybe_warnx("unknown compression method"); 844 goto stop_and_fail; 845 } 846 ADVANCE(); 847 state++; 848 break; 849 850 case GZSTATE_FLAGS: 851 flags = *z.next_in; 852 ADVANCE(); 853 skip_count = 6; 854 state++; 855 break; 856 857 case GZSTATE_SKIPPING: 858 if (skip_count > 0) { 859 skip_count--; 860 ADVANCE(); 861 } else 862 state++; 863 break; 864 865 case GZSTATE_EXTRA: 866 if ((flags & EXTRA_FIELD) == 0) { 867 state = GZSTATE_ORIGNAME; 868 break; 869 } 870 skip_count = *z.next_in; 871 ADVANCE(); 872 state++; 873 break; 874 875 case GZSTATE_EXTRA2: 876 skip_count |= ((*z.next_in) << 8); 877 ADVANCE(); 878 state++; 879 break; 880 881 case GZSTATE_EXTRA3: 882 if (skip_count > 0) { 883 skip_count--; 884 ADVANCE(); 885 } else 886 state++; 887 break; 888 889 case GZSTATE_ORIGNAME: 890 if ((flags & ORIG_NAME) == 0) { 891 state++; 892 break; 893 } 894 if (*z.next_in == 0) 895 state++; 896 ADVANCE(); 897 break; 898 899 case GZSTATE_COMMENT: 900 if ((flags & COMMENT) == 0) { 901 state++; 902 break; 903 } 904 if (*z.next_in == 0) 905 state++; 906 ADVANCE(); 907 break; 908 909 case GZSTATE_HEAD_CRC1: 910 if (flags & HEAD_CRC) 911 skip_count = 2; 912 else 913 skip_count = 0; 914 state++; 915 break; 916 917 case GZSTATE_HEAD_CRC2: 918 if (skip_count > 0) { 919 skip_count--; 920 ADVANCE(); 921 } else 922 state++; 923 break; 924 925 case GZSTATE_INIT: 926 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) { 927 maybe_warnx("failed to inflateInit"); 928 goto stop_and_fail; 929 } 930 state++; 931 break; 932 933 case GZSTATE_READ: 934 error = inflate(&z, Z_FINISH); 935 switch (error) { 936 /* Z_BUF_ERROR goes with Z_FINISH... */ 937 case Z_BUF_ERROR: 938 if (z.avail_out > 0 && !done_reading) 939 continue; 940 941 case Z_STREAM_END: 942 case Z_OK: 943 break; 944 945 case Z_NEED_DICT: 946 maybe_warnx("Z_NEED_DICT error"); 947 goto stop_and_fail; 948 case Z_DATA_ERROR: 949 maybe_warnx("data stream error"); 950 goto stop_and_fail; 951 case Z_STREAM_ERROR: 952 maybe_warnx("internal stream error"); 953 goto stop_and_fail; 954 case Z_MEM_ERROR: 955 maybe_warnx("memory allocation error"); 956 goto stop_and_fail; 957 958 default: 959 maybe_warn("unknown error from inflate(): %d", 960 error); 961 } 962 wr = BUFLEN - z.avail_out; 963 964 if (wr != 0) { 965 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr); 966 if ( 967 /* don't write anything with -t */ 968 tflag == 0 && 969 write_retry(out, outbufp, wr) != wr) { 970 maybe_warn("error writing to output"); 971 goto stop_and_fail; 972 } 973 974 out_tot += wr; 975 out_sub_tot += wr; 976 } 977 978 if (error == Z_STREAM_END) { 979 inflateEnd(&z); 980 state++; 981 } 982 983 z.next_out = (unsigned char *)outbufp; 984 z.avail_out = BUFLEN; 985 986 break; 987 case GZSTATE_CRC: 988 { 989 uLong origcrc; 990 991 if (z.avail_in < 4) { 992 if (!done_reading) { 993 needmore = 1; 994 continue; 995 } 996 maybe_warnx("truncated input"); 997 goto stop_and_fail; 998 } 999 origcrc = le32dec(&z.next_in[0]); 1000 if (origcrc != crc) { 1001 maybe_warnx("invalid compressed" 1002 " data--crc error"); 1003 goto stop_and_fail; 1004 } 1005 } 1006 1007 z.avail_in -= 4; 1008 z.next_in += 4; 1009 1010 if (!z.avail_in && done_reading) { 1011 goto stop; 1012 } 1013 state++; 1014 break; 1015 case GZSTATE_LEN: 1016 { 1017 uLong origlen; 1018 1019 if (z.avail_in < 4) { 1020 if (!done_reading) { 1021 needmore = 1; 1022 continue; 1023 } 1024 maybe_warnx("truncated input"); 1025 goto stop_and_fail; 1026 } 1027 origlen = le32dec(&z.next_in[0]); 1028 1029 if (origlen != out_sub_tot) { 1030 maybe_warnx("invalid compressed" 1031 " data--length error"); 1032 goto stop_and_fail; 1033 } 1034 } 1035 1036 z.avail_in -= 4; 1037 z.next_in += 4; 1038 1039 if (error < 0) { 1040 maybe_warnx("decompression error"); 1041 goto stop_and_fail; 1042 } 1043 state = GZSTATE_MAGIC0; 1044 break; 1045 } 1046 continue; 1047 stop_and_fail: 1048 out_tot = -1; 1049 stop: 1050 break; 1051 } 1052 if (state > GZSTATE_INIT) 1053 inflateEnd(&z); 1054 1055 free(inbufp); 1056 out1: 1057 free(outbufp); 1058 out2: 1059 if (gsizep) 1060 *gsizep = in_tot; 1061 return (out_tot); 1062 } 1063 1064 /* 1065 * set the owner, mode, flags & utimes using the given file descriptor. 1066 * file is only used in possible warning messages. 1067 */ 1068 static void 1069 copymodes(int fd, const struct stat *sbp, const char *file) 1070 { 1071 struct timespec times[2]; 1072 struct stat sb; 1073 1074 /* 1075 * If we have no info on the input, give this file some 1076 * default values and return.. 1077 */ 1078 if (sbp == NULL) { 1079 mode_t mask = umask(022); 1080 1081 (void)fchmod(fd, DEFFILEMODE & ~mask); 1082 (void)umask(mask); 1083 return; 1084 } 1085 sb = *sbp; 1086 1087 /* if the chown fails, remove set-id bits as-per compress(1) */ 1088 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) { 1089 if (errno != EPERM) 1090 maybe_warn("couldn't fchown: %s", file); 1091 sb.st_mode &= ~(S_ISUID|S_ISGID); 1092 } 1093 1094 /* we only allow set-id and the 9 normal permission bits */ 1095 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 1096 if (fchmod(fd, sb.st_mode) < 0) 1097 maybe_warn("couldn't fchmod: %s", file); 1098 1099 times[0] = sb.st_atim; 1100 times[1] = sb.st_mtim; 1101 if (futimens(fd, times) < 0) 1102 maybe_warn("couldn't futimens: %s", file); 1103 1104 /* only try flags if they exist already */ 1105 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0) 1106 maybe_warn("couldn't fchflags: %s", file); 1107 } 1108 1109 /* what sort of file is this? */ 1110 static enum filetype 1111 file_gettype(u_char *buf) 1112 { 1113 1114 if (buf[0] == GZIP_MAGIC0 && 1115 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1)) 1116 return FT_GZIP; 1117 #ifndef NO_BZIP2_SUPPORT 1118 else if (memcmp(buf, BZIP2_MAGIC, 3) == 0 && 1119 buf[3] >= '0' && buf[3] <= '9') 1120 return FT_BZIP2; 1121 #endif 1122 #ifndef NO_COMPRESS_SUPPORT 1123 else if (memcmp(buf, Z_MAGIC, 2) == 0) 1124 return FT_Z; 1125 #endif 1126 #ifndef NO_PACK_SUPPORT 1127 else if (memcmp(buf, PACK_MAGIC, 2) == 0) 1128 return FT_PACK; 1129 #endif 1130 #ifndef NO_XZ_SUPPORT 1131 else if (memcmp(buf, XZ_MAGIC, 4) == 0) /* XXX: We only have 4 bytes */ 1132 return FT_XZ; 1133 #endif 1134 #ifndef NO_LZ_SUPPORT 1135 else if (memcmp(buf, LZ_MAGIC, 4) == 0) 1136 return FT_LZ; 1137 #endif 1138 #ifndef NO_ZSTD_SUPPORT 1139 else if (memcmp(buf, ZSTD_MAGIC, 4) == 0) 1140 return FT_ZSTD; 1141 #endif 1142 else 1143 return FT_UNKNOWN; 1144 } 1145 1146 /* check the outfile is OK. */ 1147 static int 1148 check_outfile(const char *outfile) 1149 { 1150 struct stat sb; 1151 int ok = 1; 1152 1153 if (lflag == 0 && stat(outfile, &sb) == 0) { 1154 if (fflag) 1155 unlink(outfile); 1156 else if (isatty(STDIN_FILENO)) { 1157 char ans[10] = { 'n', '\0' }; /* default */ 1158 1159 fprintf(stderr, "%s already exists -- do you wish to " 1160 "overwrite (y or n)? " , outfile); 1161 (void)fgets(ans, sizeof(ans) - 1, stdin); 1162 if (ans[0] != 'y' && ans[0] != 'Y') { 1163 fprintf(stderr, "\tnot overwriting\n"); 1164 ok = 0; 1165 } else 1166 unlink(outfile); 1167 } else { 1168 maybe_warnx("%s already exists -- skipping", outfile); 1169 ok = 0; 1170 } 1171 } 1172 return ok; 1173 } 1174 1175 static void 1176 unlink_input(const char *file, const struct stat *sb) 1177 { 1178 struct stat nsb; 1179 1180 if (kflag) 1181 return; 1182 if (stat(file, &nsb) != 0) 1183 /* Must be gone already */ 1184 return; 1185 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino) 1186 /* Definitely a different file */ 1187 return; 1188 unlink(file); 1189 } 1190 1191 static void 1192 got_sigint(int signo __unused) 1193 { 1194 1195 if (remove_file != NULL) 1196 unlink(remove_file); 1197 _exit(2); 1198 } 1199 1200 static void 1201 got_siginfo(int signo __unused) 1202 { 1203 1204 print_info = 1; 1205 } 1206 1207 static void 1208 setup_signals(void) 1209 { 1210 1211 signal(SIGINFO, got_siginfo); 1212 signal(SIGINT, got_sigint); 1213 } 1214 1215 static void 1216 infile_newdata(size_t newdata) 1217 { 1218 1219 infile_current += newdata; 1220 } 1221 1222 static void 1223 infile_set(const char *newinfile, off_t total) 1224 { 1225 1226 if (newinfile) 1227 infile = newinfile; 1228 infile_total = total; 1229 } 1230 1231 static void 1232 infile_clear(void) 1233 { 1234 1235 infile = NULL; 1236 infile_total = infile_current = 0; 1237 } 1238 1239 static const suffixes_t * 1240 check_suffix(char *file, int xlate) 1241 { 1242 const suffixes_t *s; 1243 int len = strlen(file); 1244 char *sp; 1245 1246 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) { 1247 /* if it doesn't fit in "a.suf", don't bother */ 1248 if (s->ziplen >= len) 1249 continue; 1250 sp = file + len - s->ziplen; 1251 if (strcmp(s->zipped, sp) != 0) 1252 continue; 1253 if (xlate) 1254 strcpy(sp, s->normal); 1255 return s; 1256 } 1257 return NULL; 1258 } 1259 1260 /* 1261 * compress the given file: create a corresponding .gz file and remove the 1262 * original. 1263 */ 1264 static off_t 1265 file_compress(char *file, char *outfile, size_t outsize) 1266 { 1267 int in; 1268 int out; 1269 off_t size, in_size; 1270 struct stat isb, osb; 1271 const suffixes_t *suff; 1272 1273 in = open(file, O_RDONLY); 1274 if (in == -1) { 1275 maybe_warn("can't open %s", file); 1276 return (-1); 1277 } 1278 1279 if (fstat(in, &isb) != 0) { 1280 maybe_warn("couldn't stat: %s", file); 1281 close(in); 1282 return (-1); 1283 } 1284 1285 if (fstat(in, &isb) != 0) { 1286 close(in); 1287 maybe_warn("can't stat %s", file); 1288 return -1; 1289 } 1290 infile_set(file, isb.st_size); 1291 1292 if (cflag == 0) { 1293 if (isb.st_nlink > 1 && fflag == 0) { 1294 maybe_warnx("%s has %ju other link%s -- " 1295 "skipping", file, 1296 (uintmax_t)isb.st_nlink - 1, 1297 isb.st_nlink == 1 ? "" : "s"); 1298 close(in); 1299 return -1; 1300 } 1301 1302 if (fflag == 0 && (suff = check_suffix(file, 0)) && 1303 suff->zipped[0] != 0) { 1304 maybe_warnx("%s already has %s suffix -- unchanged", 1305 file, suff->zipped); 1306 close(in); 1307 return (-1); 1308 } 1309 1310 /* Add (usually) .gz to filename */ 1311 if ((size_t)snprintf(outfile, outsize, "%s%s", 1312 file, suffixes[0].zipped) >= outsize) 1313 memcpy(outfile + outsize - suffixes[0].ziplen - 1, 1314 suffixes[0].zipped, suffixes[0].ziplen + 1); 1315 1316 if (check_outfile(outfile) == 0) { 1317 close(in); 1318 return (-1); 1319 } 1320 } 1321 1322 if (cflag == 0) { 1323 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600); 1324 if (out == -1) { 1325 maybe_warn("could not create output: %s", outfile); 1326 fclose(stdin); 1327 return (-1); 1328 } 1329 remove_file = outfile; 1330 } else 1331 out = STDOUT_FILENO; 1332 1333 in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime); 1334 1335 (void)close(in); 1336 1337 /* 1338 * If there was an error, in_size will be -1. 1339 * If we compressed to stdout, just return the size. 1340 * Otherwise stat the file and check it is the correct size. 1341 * We only blow away the file if we can stat the output and it 1342 * has the expected size. 1343 */ 1344 if (cflag != 0) 1345 return in_size == -1 ? -1 : size; 1346 1347 if (fstat(out, &osb) != 0) { 1348 maybe_warn("couldn't stat: %s", outfile); 1349 goto bad_outfile; 1350 } 1351 1352 if (osb.st_size != size) { 1353 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting", 1354 outfile, (uintmax_t)osb.st_size, (uintmax_t)size); 1355 goto bad_outfile; 1356 } 1357 1358 copymodes(out, &isb, outfile); 1359 remove_file = NULL; 1360 if (close(out) == -1) 1361 maybe_warn("couldn't close output"); 1362 1363 /* output is good, ok to delete input */ 1364 unlink_input(file, &isb); 1365 return (size); 1366 1367 bad_outfile: 1368 if (close(out) == -1) 1369 maybe_warn("couldn't close output"); 1370 1371 maybe_warnx("leaving original %s", file); 1372 unlink(outfile); 1373 return (size); 1374 } 1375 1376 /* uncompress the given file and remove the original */ 1377 static off_t 1378 file_uncompress(char *file, char *outfile, size_t outsize) 1379 { 1380 struct stat isb, osb; 1381 off_t size; 1382 ssize_t rbytes; 1383 unsigned char fourbytes[4]; 1384 enum filetype method; 1385 int fd, ofd, zfd = -1; 1386 int error; 1387 size_t in_size; 1388 ssize_t rv; 1389 time_t timestamp = 0; 1390 char name[PATH_MAX + 1]; 1391 1392 /* gather the old name info */ 1393 1394 fd = open(file, O_RDONLY); 1395 if (fd < 0) { 1396 maybe_warn("can't open %s", file); 1397 goto lose; 1398 } 1399 if (fstat(fd, &isb) != 0) { 1400 maybe_warn("can't stat %s", file); 1401 goto lose; 1402 } 1403 if (S_ISREG(isb.st_mode)) 1404 in_size = isb.st_size; 1405 else 1406 in_size = 0; 1407 infile_set(file, in_size); 1408 1409 strlcpy(outfile, file, outsize); 1410 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) { 1411 maybe_warnx("%s: unknown suffix -- ignored", file); 1412 goto lose; 1413 } 1414 1415 rbytes = read(fd, fourbytes, sizeof fourbytes); 1416 if (rbytes != sizeof fourbytes) { 1417 /* we don't want to fail here. */ 1418 if (fflag) 1419 goto lose; 1420 if (rbytes == -1) 1421 maybe_warn("can't read %s", file); 1422 else 1423 goto unexpected_EOF; 1424 goto lose; 1425 } 1426 infile_newdata(rbytes); 1427 1428 method = file_gettype(fourbytes); 1429 if (fflag == 0 && method == FT_UNKNOWN) { 1430 maybe_warnx("%s: not in gzip format", file); 1431 goto lose; 1432 } 1433 1434 1435 if (method == FT_GZIP && Nflag) { 1436 unsigned char ts[4]; /* timestamp */ 1437 1438 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP); 1439 if (rv >= 0 && rv < (ssize_t)(sizeof ts)) 1440 goto unexpected_EOF; 1441 if (rv == -1) { 1442 if (!fflag) 1443 maybe_warn("can't read %s", file); 1444 goto lose; 1445 } 1446 infile_newdata(rv); 1447 timestamp = le32dec(&ts[0]); 1448 1449 if (fourbytes[3] & ORIG_NAME) { 1450 rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME); 1451 if (rbytes < 0) { 1452 maybe_warn("can't read %s", file); 1453 goto lose; 1454 } 1455 if (name[0] != '\0') { 1456 char *dp, *nf; 1457 1458 /* Make sure that name is NUL-terminated */ 1459 name[rbytes] = '\0'; 1460 1461 /* strip saved directory name */ 1462 nf = strrchr(name, '/'); 1463 if (nf == NULL) 1464 nf = name; 1465 else 1466 nf++; 1467 1468 /* preserve original directory name */ 1469 dp = strrchr(file, '/'); 1470 if (dp == NULL) 1471 dp = file; 1472 else 1473 dp++; 1474 snprintf(outfile, outsize, "%.*s%.*s", 1475 (int) (dp - file), 1476 file, (int) rbytes, nf); 1477 } 1478 } 1479 } 1480 lseek(fd, 0, SEEK_SET); 1481 1482 if (cflag == 0 || lflag) { 1483 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) { 1484 maybe_warnx("%s has %ju other links -- skipping", 1485 file, (uintmax_t)isb.st_nlink - 1); 1486 goto lose; 1487 } 1488 if (nflag == 0 && timestamp) 1489 isb.st_mtime = timestamp; 1490 if (check_outfile(outfile) == 0) 1491 goto lose; 1492 } 1493 1494 if (cflag) 1495 zfd = STDOUT_FILENO; 1496 else if (lflag) 1497 zfd = -1; 1498 else { 1499 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600); 1500 if (zfd == STDOUT_FILENO) { 1501 /* We won't close STDOUT_FILENO later... */ 1502 zfd = dup(zfd); 1503 close(STDOUT_FILENO); 1504 } 1505 if (zfd == -1) { 1506 maybe_warn("can't open %s", outfile); 1507 goto lose; 1508 } 1509 remove_file = outfile; 1510 } 1511 1512 switch (method) { 1513 #ifndef NO_BZIP2_SUPPORT 1514 case FT_BZIP2: 1515 /* XXX */ 1516 if (lflag) { 1517 maybe_warnx("no -l with bzip2 files"); 1518 goto lose; 1519 } 1520 1521 size = unbzip2(fd, zfd, NULL, 0, NULL); 1522 break; 1523 #endif 1524 1525 #ifndef NO_COMPRESS_SUPPORT 1526 case FT_Z: { 1527 FILE *in, *out; 1528 1529 /* XXX */ 1530 if (lflag) { 1531 maybe_warnx("no -l with Lempel-Ziv files"); 1532 goto lose; 1533 } 1534 1535 if ((in = zdopen(fd)) == NULL) { 1536 maybe_warn("zdopen for read: %s", file); 1537 goto lose; 1538 } 1539 1540 out = fdopen(dup(zfd), "w"); 1541 if (out == NULL) { 1542 maybe_warn("fdopen for write: %s", outfile); 1543 fclose(in); 1544 goto lose; 1545 } 1546 1547 size = zuncompress(in, out, NULL, 0, NULL); 1548 /* need to fclose() if ferror() is true... */ 1549 error = ferror(in); 1550 if (error | fclose(in)) { 1551 if (error) 1552 maybe_warn("failed infile"); 1553 else 1554 maybe_warn("failed infile fclose"); 1555 if (cflag == 0) 1556 unlink(outfile); 1557 (void)fclose(out); 1558 goto lose; 1559 } 1560 if (fclose(out) != 0) { 1561 maybe_warn("failed outfile fclose"); 1562 if (cflag == 0) 1563 unlink(outfile); 1564 goto lose; 1565 } 1566 break; 1567 } 1568 #endif 1569 1570 #ifndef NO_PACK_SUPPORT 1571 case FT_PACK: 1572 if (lflag) { 1573 maybe_warnx("no -l with packed files"); 1574 goto lose; 1575 } 1576 1577 size = unpack(fd, zfd, NULL, 0, NULL); 1578 break; 1579 #endif 1580 1581 #ifndef NO_XZ_SUPPORT 1582 case FT_XZ: 1583 if (lflag) { 1584 size = unxz_len(fd); 1585 if (!tflag) { 1586 print_list_out(in_size, size, file); 1587 close(fd); 1588 return -1; 1589 } 1590 } else 1591 size = unxz(fd, zfd, NULL, 0, NULL); 1592 break; 1593 #endif 1594 1595 #ifndef NO_LZ_SUPPORT 1596 case FT_LZ: 1597 if (lflag) { 1598 maybe_warnx("no -l with lzip files"); 1599 goto lose; 1600 } 1601 size = unlz(fd, zfd, NULL, 0, NULL); 1602 break; 1603 #endif 1604 1605 #ifndef NO_ZSTD_SUPPORT 1606 case FT_ZSTD: 1607 if (lflag) { 1608 maybe_warnx("no -l with zstd files"); 1609 goto lose; 1610 } 1611 size = unzstd(fd, zfd, NULL, 0, NULL); 1612 break; 1613 #endif 1614 case FT_UNKNOWN: 1615 if (lflag) { 1616 maybe_warnx("no -l for unknown filetypes"); 1617 goto lose; 1618 } 1619 size = cat_fd(NULL, 0, NULL, fd); 1620 break; 1621 default: 1622 if (lflag) { 1623 print_list(fd, in_size, outfile, isb.st_mtime); 1624 if (!tflag) { 1625 close(fd); 1626 return -1; /* XXX */ 1627 } 1628 } 1629 1630 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file); 1631 break; 1632 } 1633 1634 if (close(fd) != 0) 1635 maybe_warn("couldn't close input"); 1636 if (zfd != STDOUT_FILENO && close(zfd) != 0) 1637 maybe_warn("couldn't close output"); 1638 1639 if (size == -1) { 1640 if (cflag == 0) 1641 unlink(outfile); 1642 maybe_warnx("%s: uncompress failed", file); 1643 return -1; 1644 } 1645 1646 /* if testing, or we uncompressed to stdout, this is all we need */ 1647 if (tflag) 1648 return size; 1649 /* if we are uncompressing to stdin, don't remove the file. */ 1650 if (cflag) 1651 return size; 1652 1653 /* 1654 * if we create a file... 1655 */ 1656 /* 1657 * if we can't stat the file don't remove the file. 1658 */ 1659 1660 ofd = open(outfile, O_RDWR, 0); 1661 if (ofd == -1) { 1662 maybe_warn("couldn't open (leaving original): %s", 1663 outfile); 1664 return -1; 1665 } 1666 if (fstat(ofd, &osb) != 0) { 1667 maybe_warn("couldn't stat (leaving original): %s", 1668 outfile); 1669 close(ofd); 1670 return -1; 1671 } 1672 if (osb.st_size != size) { 1673 maybe_warnx("stat gave different size: %ju != %ju (leaving original)", 1674 (uintmax_t)size, (uintmax_t)osb.st_size); 1675 close(ofd); 1676 unlink(outfile); 1677 return -1; 1678 } 1679 copymodes(ofd, &isb, outfile); 1680 remove_file = NULL; 1681 close(ofd); 1682 unlink_input(file, &isb); 1683 return size; 1684 1685 unexpected_EOF: 1686 maybe_warnx("%s: unexpected end of file", file); 1687 lose: 1688 if (fd != -1) 1689 close(fd); 1690 if (zfd != -1 && zfd != STDOUT_FILENO) 1691 close(zfd); 1692 return -1; 1693 } 1694 1695 static void 1696 check_siginfo(void) 1697 { 1698 if (print_info == 0) 1699 return; 1700 if (infile) { 1701 if (infile_total) { 1702 int pcent = (int)((100.0 * infile_current) / infile_total); 1703 1704 fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n", 1705 infile, (unsigned long long)infile_current, 1706 (unsigned long long)infile_total, pcent); 1707 } else 1708 fprintf(stderr, "%s: done %llu bytes\n", 1709 infile, (unsigned long long)infile_current); 1710 } 1711 print_info = 0; 1712 } 1713 1714 static off_t 1715 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd) 1716 { 1717 char buf[BUFLEN]; 1718 off_t in_tot; 1719 ssize_t w; 1720 1721 in_tot = count; 1722 w = write_retry(STDOUT_FILENO, prepend, count); 1723 if (w == -1 || (size_t)w != count) { 1724 maybe_warn("write to stdout"); 1725 return -1; 1726 } 1727 for (;;) { 1728 ssize_t rv; 1729 1730 rv = read(fd, buf, sizeof buf); 1731 if (rv == 0) 1732 break; 1733 if (rv < 0) { 1734 maybe_warn("read from fd %d", fd); 1735 break; 1736 } 1737 infile_newdata(rv); 1738 1739 if (write_retry(STDOUT_FILENO, buf, rv) != rv) { 1740 maybe_warn("write to stdout"); 1741 break; 1742 } 1743 in_tot += rv; 1744 } 1745 1746 if (gsizep) 1747 *gsizep = in_tot; 1748 return (in_tot); 1749 } 1750 1751 static void 1752 handle_stdin(void) 1753 { 1754 struct stat isb; 1755 unsigned char fourbytes[4]; 1756 size_t in_size; 1757 off_t usize, gsize; 1758 enum filetype method; 1759 ssize_t bytes_read; 1760 #ifndef NO_COMPRESS_SUPPORT 1761 FILE *in; 1762 #endif 1763 1764 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) { 1765 maybe_warnx("standard input is a terminal -- ignoring"); 1766 goto out; 1767 } 1768 1769 if (fstat(STDIN_FILENO, &isb) < 0) { 1770 maybe_warn("fstat"); 1771 goto out; 1772 } 1773 if (S_ISREG(isb.st_mode)) 1774 in_size = isb.st_size; 1775 else 1776 in_size = 0; 1777 infile_set("(stdin)", in_size); 1778 1779 if (lflag) { 1780 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime); 1781 goto out; 1782 } 1783 1784 bytes_read = read_retry(STDIN_FILENO, fourbytes, sizeof fourbytes); 1785 if (bytes_read == -1) { 1786 maybe_warn("can't read stdin"); 1787 goto out; 1788 } else if (bytes_read != sizeof(fourbytes)) { 1789 maybe_warnx("(stdin): unexpected end of file"); 1790 goto out; 1791 } 1792 1793 method = file_gettype(fourbytes); 1794 switch (method) { 1795 default: 1796 if (fflag == 0) { 1797 maybe_warnx("unknown compression format"); 1798 goto out; 1799 } 1800 usize = cat_fd(fourbytes, sizeof fourbytes, &gsize, STDIN_FILENO); 1801 break; 1802 case FT_GZIP: 1803 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO, 1804 (char *)fourbytes, sizeof fourbytes, &gsize, "(stdin)"); 1805 break; 1806 #ifndef NO_BZIP2_SUPPORT 1807 case FT_BZIP2: 1808 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO, 1809 (char *)fourbytes, sizeof fourbytes, &gsize); 1810 break; 1811 #endif 1812 #ifndef NO_COMPRESS_SUPPORT 1813 case FT_Z: 1814 if ((in = zdopen(STDIN_FILENO)) == NULL) { 1815 maybe_warnx("zopen of stdin"); 1816 goto out; 1817 } 1818 1819 usize = zuncompress(in, stdout, (char *)fourbytes, 1820 sizeof fourbytes, &gsize); 1821 fclose(in); 1822 break; 1823 #endif 1824 #ifndef NO_PACK_SUPPORT 1825 case FT_PACK: 1826 usize = unpack(STDIN_FILENO, STDOUT_FILENO, 1827 (char *)fourbytes, sizeof fourbytes, &gsize); 1828 break; 1829 #endif 1830 #ifndef NO_XZ_SUPPORT 1831 case FT_XZ: 1832 usize = unxz(STDIN_FILENO, STDOUT_FILENO, 1833 (char *)fourbytes, sizeof fourbytes, &gsize); 1834 break; 1835 #endif 1836 #ifndef NO_LZ_SUPPORT 1837 case FT_LZ: 1838 usize = unlz(STDIN_FILENO, STDOUT_FILENO, 1839 (char *)fourbytes, sizeof fourbytes, &gsize); 1840 break; 1841 #endif 1842 #ifndef NO_ZSTD_SUPPORT 1843 case FT_ZSTD: 1844 usize = unzstd(STDIN_FILENO, STDOUT_FILENO, 1845 (char *)fourbytes, sizeof fourbytes, &gsize); 1846 break; 1847 #endif 1848 } 1849 1850 if (vflag && !tflag && usize != -1 && gsize != -1) 1851 print_verbage(NULL, NULL, usize, gsize); 1852 if (vflag && tflag) 1853 print_test("(stdin)", usize != -1); 1854 1855 out: 1856 infile_clear(); 1857 } 1858 1859 static void 1860 handle_stdout(void) 1861 { 1862 off_t gsize; 1863 off_t usize; 1864 struct stat sb; 1865 time_t systime; 1866 uint32_t mtime; 1867 int ret; 1868 1869 infile_set("(stdout)", 0); 1870 1871 if (fflag == 0 && isatty(STDOUT_FILENO)) { 1872 maybe_warnx("standard output is a terminal -- ignoring"); 1873 return; 1874 } 1875 1876 /* If stdin is a file use its mtime, otherwise use current time */ 1877 ret = fstat(STDIN_FILENO, &sb); 1878 if (ret < 0) { 1879 maybe_warn("Can't stat stdin"); 1880 return; 1881 } 1882 1883 if (S_ISREG(sb.st_mode)) { 1884 infile_set("(stdout)", sb.st_size); 1885 mtime = (uint32_t)sb.st_mtime; 1886 } else { 1887 systime = time(NULL); 1888 if (systime == -1) { 1889 maybe_warn("time"); 1890 return; 1891 } 1892 mtime = (uint32_t)systime; 1893 } 1894 1895 usize = 1896 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime); 1897 if (vflag && !tflag && usize != -1 && gsize != -1) 1898 print_verbage(NULL, NULL, usize, gsize); 1899 } 1900 1901 /* do what is asked for, for the path name */ 1902 static void 1903 handle_pathname(char *path) 1904 { 1905 char *opath = path, *s = NULL; 1906 ssize_t len; 1907 int slen; 1908 struct stat sb; 1909 1910 /* check for stdout/stdin */ 1911 if (path[0] == '-' && path[1] == '\0') { 1912 if (dflag) 1913 handle_stdin(); 1914 else 1915 handle_stdout(); 1916 return; 1917 } 1918 1919 retry: 1920 if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 && 1921 lstat(path, &sb) != 0)) { 1922 /* lets try <path>.gz if we're decompressing */ 1923 if (dflag && s == NULL && errno == ENOENT) { 1924 len = strlen(path); 1925 slen = suffixes[0].ziplen; 1926 s = malloc(len + slen + 1); 1927 if (s == NULL) 1928 maybe_err("malloc"); 1929 memcpy(s, path, len); 1930 memcpy(s + len, suffixes[0].zipped, slen + 1); 1931 path = s; 1932 goto retry; 1933 } 1934 maybe_warn("can't stat: %s", opath); 1935 goto out; 1936 } 1937 1938 if (S_ISDIR(sb.st_mode)) { 1939 if (rflag) 1940 handle_dir(path); 1941 else 1942 maybe_warnx("%s is a directory", path); 1943 goto out; 1944 } 1945 1946 if (S_ISREG(sb.st_mode)) 1947 handle_file(path, &sb); 1948 else 1949 maybe_warnx("%s is not a regular file", path); 1950 1951 out: 1952 if (s) 1953 free(s); 1954 } 1955 1956 /* compress/decompress a file */ 1957 static void 1958 handle_file(char *file, struct stat *sbp) 1959 { 1960 off_t usize, gsize; 1961 char outfile[PATH_MAX]; 1962 1963 infile_set(file, sbp->st_size); 1964 if (dflag) { 1965 usize = file_uncompress(file, outfile, sizeof(outfile)); 1966 if (vflag && tflag) 1967 print_test(file, usize != -1); 1968 if (usize == -1) 1969 return; 1970 gsize = sbp->st_size; 1971 } else { 1972 gsize = file_compress(file, outfile, sizeof(outfile)); 1973 if (gsize == -1) 1974 return; 1975 usize = sbp->st_size; 1976 } 1977 infile_clear(); 1978 1979 if (vflag && !tflag) 1980 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize); 1981 } 1982 1983 /* this is used with -r to recursively descend directories */ 1984 static void 1985 handle_dir(char *dir) 1986 { 1987 char *path_argv[2]; 1988 FTS *fts; 1989 FTSENT *entry; 1990 1991 path_argv[0] = dir; 1992 path_argv[1] = 0; 1993 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL); 1994 if (fts == NULL) { 1995 warn("couldn't fts_open %s", dir); 1996 return; 1997 } 1998 1999 while (errno = 0, (entry = fts_read(fts))) { 2000 switch(entry->fts_info) { 2001 case FTS_D: 2002 case FTS_DP: 2003 continue; 2004 2005 case FTS_DNR: 2006 case FTS_ERR: 2007 case FTS_NS: 2008 maybe_warn("%s", entry->fts_path); 2009 continue; 2010 case FTS_F: 2011 handle_file(entry->fts_path, entry->fts_statp); 2012 } 2013 } 2014 if (errno != 0) 2015 warn("error with fts_read %s", dir); 2016 (void)fts_close(fts); 2017 } 2018 2019 /* print a ratio - size reduction as a fraction of uncompressed size */ 2020 static void 2021 print_ratio(off_t in, off_t out, FILE *where) 2022 { 2023 int percent10; /* 10 * percent */ 2024 off_t diff; 2025 char buff[8]; 2026 int len; 2027 2028 diff = in - out/2; 2029 if (in == 0 && out == 0) 2030 percent10 = 0; 2031 else if (diff < 0) 2032 /* 2033 * Output is more than double size of input! print -99.9% 2034 * Quite possibly we've failed to get the original size. 2035 */ 2036 percent10 = -999; 2037 else { 2038 /* 2039 * We only need 12 bits of result from the final division, 2040 * so reduce the values until a 32bit division will suffice. 2041 */ 2042 while (in > 0x100000) { 2043 diff >>= 1; 2044 in >>= 1; 2045 } 2046 if (in != 0) 2047 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000; 2048 else 2049 percent10 = 0; 2050 } 2051 2052 len = snprintf(buff, sizeof buff, "%2.2d.", percent10); 2053 /* Move the '.' to before the last digit */ 2054 buff[len - 1] = buff[len - 2]; 2055 buff[len - 2] = '.'; 2056 fprintf(where, "%5s%%", buff); 2057 } 2058 2059 /* print compression statistics, and the new name (if there is one!) */ 2060 static void 2061 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize) 2062 { 2063 if (file) 2064 fprintf(stderr, "%s:%s ", file, 2065 strlen(file) < 7 ? "\t\t" : "\t"); 2066 print_ratio(usize, gsize, stderr); 2067 if (nfile) 2068 fprintf(stderr, " -- replaced with %s", nfile); 2069 fprintf(stderr, "\n"); 2070 fflush(stderr); 2071 } 2072 2073 /* print test results */ 2074 static void 2075 print_test(const char *file, int ok) 2076 { 2077 2078 if (exit_value == 0 && ok == 0) 2079 exit_value = 1; 2080 fprintf(stderr, "%s:%s %s\n", file, 2081 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK"); 2082 fflush(stderr); 2083 } 2084 2085 /* print a file's info ala --list */ 2086 /* eg: 2087 compressed uncompressed ratio uncompressed_name 2088 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar 2089 */ 2090 static void 2091 print_list(int fd, off_t out, const char *outfile, time_t ts) 2092 { 2093 static int first = 1; 2094 static off_t in_tot, out_tot; 2095 uint32_t crc = 0; 2096 off_t in = 0, rv; 2097 2098 if (first) { 2099 if (vflag) 2100 printf("method crc date time "); 2101 if (qflag == 0) 2102 printf(" compressed uncompressed " 2103 "ratio uncompressed_name\n"); 2104 } 2105 first = 0; 2106 2107 /* print totals? */ 2108 if (fd == -1) { 2109 in = in_tot; 2110 out = out_tot; 2111 } else 2112 { 2113 /* read the last 4 bytes - this is the uncompressed size */ 2114 rv = lseek(fd, (off_t)(-8), SEEK_END); 2115 if (rv != -1) { 2116 unsigned char buf[8]; 2117 uint32_t usize; 2118 2119 rv = read(fd, (char *)buf, sizeof(buf)); 2120 if (rv == -1) 2121 maybe_warn("read of uncompressed size"); 2122 else if (rv != sizeof(buf)) 2123 maybe_warnx("read of uncompressed size"); 2124 2125 else { 2126 usize = le32dec(&buf[4]); 2127 in = (off_t)usize; 2128 crc = le32dec(&buf[0]); 2129 } 2130 } 2131 } 2132 2133 if (vflag && fd == -1) 2134 printf(" "); 2135 else if (vflag) { 2136 char *date = ctime(&ts); 2137 2138 /* skip the day, 1/100th second, and year */ 2139 date += 4; 2140 date[12] = 0; 2141 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date); 2142 } 2143 in_tot += in; 2144 out_tot += out; 2145 print_list_out(out, in, outfile); 2146 } 2147 2148 static void 2149 print_list_out(off_t out, off_t in, const char *outfile) 2150 { 2151 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in); 2152 print_ratio(in, out, stdout); 2153 printf(" %s\n", outfile); 2154 } 2155 2156 /* display the usage of NetBSD gzip */ 2157 static void 2158 usage(void) 2159 { 2160 2161 fprintf(stderr, "%s\n", gzip_version); 2162 fprintf(stderr, 2163 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n" 2164 " -1 --fast fastest (worst) compression\n" 2165 " -2 .. -8 set compression level\n" 2166 " -9 --best best (slowest) compression\n" 2167 " -c --stdout write to stdout, keep original files\n" 2168 " --to-stdout\n" 2169 " -d --decompress uncompress files\n" 2170 " --uncompress\n" 2171 " -f --force force overwriting & compress links\n" 2172 " -h --help display this help\n" 2173 " -k --keep don't delete input files during operation\n" 2174 " -l --list list compressed file contents\n" 2175 " -N --name save or restore original file name and time stamp\n" 2176 " -n --no-name don't save original file name or time stamp\n" 2177 " -q --quiet output no warnings\n" 2178 " -r --recursive recursively compress files in directories\n" 2179 " -S .suf use suffix .suf instead of .gz\n" 2180 " --suffix .suf\n" 2181 " -t --test test compressed file\n" 2182 " -V --version display program version\n" 2183 " -v --verbose print extra statistics\n", 2184 getprogname()); 2185 exit(0); 2186 } 2187 2188 /* display the license information of FreeBSD gzip */ 2189 static void 2190 display_license(void) 2191 { 2192 2193 fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version); 2194 fprintf(stderr, "%s\n", gzip_copyright); 2195 exit(0); 2196 } 2197 2198 /* display the version of NetBSD gzip */ 2199 static void 2200 display_version(void) 2201 { 2202 2203 fprintf(stderr, "%s\n", gzip_version); 2204 exit(0); 2205 } 2206 2207 #ifndef NO_BZIP2_SUPPORT 2208 #include "unbzip2.c" 2209 #endif 2210 #ifndef NO_COMPRESS_SUPPORT 2211 #include "zuncompress.c" 2212 #endif 2213 #ifndef NO_PACK_SUPPORT 2214 #include "unpack.c" 2215 #endif 2216 #ifndef NO_XZ_SUPPORT 2217 #include "unxz.c" 2218 #endif 2219 #ifndef NO_LZ_SUPPORT 2220 #include "unlz.c" 2221 #endif 2222 #ifndef NO_ZSTD_SUPPORT 2223 #include "unzstd.c" 2224 #endif 2225 2226 static ssize_t 2227 read_retry(int fd, void *buf, size_t sz) 2228 { 2229 char *cp = buf; 2230 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2231 2232 while (left > 0) { 2233 ssize_t ret; 2234 2235 ret = read(fd, cp, left); 2236 if (ret == -1) { 2237 return ret; 2238 } else if (ret == 0) { 2239 break; /* EOF */ 2240 } 2241 cp += ret; 2242 left -= ret; 2243 } 2244 2245 return sz - left; 2246 } 2247 2248 static ssize_t 2249 write_retry(int fd, const void *buf, size_t sz) 2250 { 2251 const char *cp = buf; 2252 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2253 2254 while (left > 0) { 2255 ssize_t ret; 2256 2257 ret = write(fd, cp, left); 2258 if (ret == -1) { 2259 return ret; 2260 } else if (ret == 0) { 2261 abort(); /* Can't happen */ 2262 } 2263 cp += ret; 2264 left -= ret; 2265 } 2266 2267 return sz - left; 2268 } 2269