Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 1 | /* minigzip.c -- simulate gzip using the zlib compression library |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 2 | * Copyright (C) 1995-2006, 2010, 2011 Jean-loup Gailly. |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 3 | * For conditions of distribution and use, see copyright notice in zlib.h |
| 4 | */ |
| 5 | |
| 6 | /* |
| 7 | * minigzip is a minimal implementation of the gzip utility. This is |
| 8 | * only an example of using zlib and isn't meant to replace the |
| 9 | * full-featured gzip. No attempt is made to deal with file systems |
| 10 | * limiting names to 14 or 8+3 characters, etc... Error checking is |
| 11 | * very limited. So use minigzip only for testing; use gzip for the |
| 12 | * real thing. On MSDOS, use only on file names without extension |
| 13 | * or in pipe mode. |
| 14 | */ |
| 15 | |
| 16 | /* @(#) $Id$ */ |
| 17 | |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 18 | #include "zlib.h" |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 19 | #include <stdio.h> |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 20 | |
| 21 | #ifdef STDC |
| 22 | # include <string.h> |
| 23 | # include <stdlib.h> |
| 24 | #endif |
| 25 | |
| 26 | #ifdef USE_MMAP |
| 27 | # include <sys/types.h> |
| 28 | # include <sys/mman.h> |
| 29 | # include <sys/stat.h> |
| 30 | #endif |
| 31 | |
| 32 | #if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__) |
| 33 | # include <fcntl.h> |
| 34 | # include <io.h> |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 35 | # ifdef UNDER_CE |
| 36 | # include <stdlib.h> |
| 37 | # endif |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 38 | # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) |
| 39 | #else |
| 40 | # define SET_BINARY_MODE(file) |
| 41 | #endif |
| 42 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 43 | #ifdef _MSC_VER |
| 44 | # define snprintf _snprintf |
| 45 | #endif |
| 46 | |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 47 | #ifdef VMS |
| 48 | # define unlink delete |
| 49 | # define GZ_SUFFIX "-gz" |
| 50 | #endif |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 51 | #ifdef RISCOS |
| 52 | # define unlink remove |
| 53 | # define GZ_SUFFIX "-gz" |
| 54 | # define fileno(file) file->__file |
| 55 | #endif |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 56 | #if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os |
| 57 | # include <unix.h> /* for fileno */ |
| 58 | #endif |
| 59 | |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 60 | #if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE) |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 61 | #ifndef WIN32 /* unlink already in stdio.h for WIN32 */ |
| 62 | extern int unlink OF((const char *)); |
| 63 | #endif |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 64 | #endif |
| 65 | |
| 66 | #if defined(UNDER_CE) |
| 67 | # include <windows.h> |
| 68 | # define perror(s) pwinerror(s) |
| 69 | |
| 70 | /* Map the Windows error number in ERROR to a locale-dependent error |
| 71 | message string and return a pointer to it. Typically, the values |
| 72 | for ERROR come from GetLastError. |
| 73 | |
| 74 | The string pointed to shall not be modified by the application, |
| 75 | but may be overwritten by a subsequent call to strwinerror |
| 76 | |
| 77 | The strwinerror function does not change the current setting |
| 78 | of GetLastError. */ |
| 79 | |
| 80 | static char *strwinerror (error) |
| 81 | DWORD error; |
| 82 | { |
| 83 | static char buf[1024]; |
| 84 | |
| 85 | wchar_t *msgbuf; |
| 86 | DWORD lasterr = GetLastError(); |
| 87 | DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
| 88 | | FORMAT_MESSAGE_ALLOCATE_BUFFER, |
| 89 | NULL, |
| 90 | error, |
| 91 | 0, /* Default language */ |
| 92 | (LPVOID)&msgbuf, |
| 93 | 0, |
| 94 | NULL); |
| 95 | if (chars != 0) { |
| 96 | /* If there is an \r\n appended, zap it. */ |
| 97 | if (chars >= 2 |
| 98 | && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { |
| 99 | chars -= 2; |
| 100 | msgbuf[chars] = 0; |
| 101 | } |
| 102 | |
| 103 | if (chars > sizeof (buf) - 1) { |
| 104 | chars = sizeof (buf) - 1; |
| 105 | msgbuf[chars] = 0; |
| 106 | } |
| 107 | |
| 108 | wcstombs(buf, msgbuf, chars + 1); |
| 109 | LocalFree(msgbuf); |
| 110 | } |
| 111 | else { |
| 112 | sprintf(buf, "unknown win32 error (%ld)", error); |
| 113 | } |
| 114 | |
| 115 | SetLastError(lasterr); |
| 116 | return buf; |
| 117 | } |
| 118 | |
| 119 | static void pwinerror (s) |
| 120 | const char *s; |
| 121 | { |
| 122 | if (s && *s) |
| 123 | fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ())); |
| 124 | else |
| 125 | fprintf(stderr, "%s\n", strwinerror(GetLastError ())); |
| 126 | } |
| 127 | |
| 128 | #endif /* UNDER_CE */ |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 129 | |
| 130 | #ifndef GZ_SUFFIX |
| 131 | # define GZ_SUFFIX ".gz" |
| 132 | #endif |
| 133 | #define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1) |
| 134 | |
| 135 | #define BUFLEN 16384 |
| 136 | #define MAX_NAME_LEN 1024 |
| 137 | |
| 138 | #ifdef MAXSEG_64K |
| 139 | # define local static |
| 140 | /* Needed for systems with limitation on stack size. */ |
| 141 | #else |
| 142 | # define local |
| 143 | #endif |
| 144 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 145 | #ifdef Z_SOLO |
| 146 | /* for Z_SOLO, create simplified gz* functions using deflate and inflate */ |
| 147 | |
| 148 | #if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE) |
| 149 | # include <unistd.h> /* for unlink() */ |
| 150 | #endif |
| 151 | |
| 152 | void *myalloc OF((void *, unsigned, unsigned)); |
| 153 | void myfree OF((void *, void *)); |
| 154 | |
| 155 | void *myalloc(q, n, m) |
| 156 | void *q; |
| 157 | unsigned n, m; |
| 158 | { |
| 159 | q = Z_NULL; |
| 160 | return calloc(n, m); |
| 161 | } |
| 162 | |
| 163 | void myfree(q, p) |
| 164 | void *q, *p; |
| 165 | { |
| 166 | q = Z_NULL; |
| 167 | free(p); |
| 168 | } |
| 169 | |
| 170 | typedef struct gzFile_s { |
| 171 | FILE *file; |
| 172 | int write; |
| 173 | int err; |
| 174 | char *msg; |
| 175 | z_stream strm; |
| 176 | } *gzFile; |
| 177 | |
| 178 | gzFile gzopen OF((const char *, const char *)); |
| 179 | gzFile gzdopen OF((int, const char *)); |
| 180 | gzFile gz_open OF((const char *, int, const char *)); |
| 181 | |
| 182 | gzFile gzopen(path, mode) |
| 183 | const char *path; |
| 184 | const char *mode; |
| 185 | { |
| 186 | return gz_open(path, -1, mode); |
| 187 | } |
| 188 | |
| 189 | gzFile gzdopen(fd, mode) |
| 190 | int fd; |
| 191 | const char *mode; |
| 192 | { |
| 193 | return gz_open(NULL, fd, mode); |
| 194 | } |
| 195 | |
| 196 | gzFile gz_open(path, fd, mode) |
| 197 | const char *path; |
| 198 | int fd; |
| 199 | const char *mode; |
| 200 | { |
| 201 | gzFile gz; |
| 202 | int ret; |
| 203 | |
| 204 | gz = malloc(sizeof(struct gzFile_s)); |
| 205 | if (gz == NULL) |
| 206 | return NULL; |
| 207 | gz->write = strchr(mode, 'w') != NULL; |
| 208 | gz->strm.zalloc = myalloc; |
| 209 | gz->strm.zfree = myfree; |
| 210 | gz->strm.opaque = Z_NULL; |
| 211 | if (gz->write) |
| 212 | ret = deflateInit2(&(gz->strm), -1, 8, 15 + 16, 8, 0); |
| 213 | else { |
| 214 | gz->strm.next_in = 0; |
| 215 | gz->strm.avail_in = Z_NULL; |
| 216 | ret = inflateInit2(&(gz->strm), 15 + 16); |
| 217 | } |
| 218 | if (ret != Z_OK) { |
| 219 | free(gz); |
| 220 | return NULL; |
| 221 | } |
| 222 | gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") : |
| 223 | fopen(path, gz->write ? "wb" : "rb"); |
| 224 | if (gz->file == NULL) { |
| 225 | gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm)); |
| 226 | free(gz); |
| 227 | return NULL; |
| 228 | } |
| 229 | gz->err = 0; |
| 230 | gz->msg = ""; |
| 231 | return gz; |
| 232 | } |
| 233 | |
| 234 | int gzwrite OF((gzFile, const void *, unsigned)); |
| 235 | |
| 236 | int gzwrite(gz, buf, len) |
| 237 | gzFile gz; |
| 238 | const void *buf; |
| 239 | unsigned len; |
| 240 | { |
| 241 | z_stream *strm; |
| 242 | unsigned char out[BUFLEN]; |
| 243 | |
| 244 | if (gz == NULL || !gz->write) |
| 245 | return 0; |
| 246 | strm = &(gz->strm); |
| 247 | strm->next_in = (void *)buf; |
| 248 | strm->avail_in = len; |
| 249 | do { |
| 250 | strm->next_out = out; |
| 251 | strm->avail_out = BUFLEN; |
| 252 | (void)deflate(strm, Z_NO_FLUSH); |
| 253 | fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); |
| 254 | } while (strm->avail_out == 0); |
| 255 | return len; |
| 256 | } |
| 257 | |
| 258 | int gzread OF((gzFile, void *, unsigned)); |
| 259 | |
| 260 | int gzread(gz, buf, len) |
| 261 | gzFile gz; |
| 262 | void *buf; |
| 263 | unsigned len; |
| 264 | { |
| 265 | int ret; |
| 266 | unsigned got; |
| 267 | unsigned char in[1]; |
| 268 | z_stream *strm; |
| 269 | |
| 270 | if (gz == NULL || gz->write) |
| 271 | return 0; |
| 272 | if (gz->err) |
| 273 | return 0; |
| 274 | strm = &(gz->strm); |
| 275 | strm->next_out = (void *)buf; |
| 276 | strm->avail_out = len; |
| 277 | do { |
| 278 | got = fread(in, 1, 1, gz->file); |
| 279 | if (got == 0) |
| 280 | break; |
| 281 | strm->next_in = in; |
| 282 | strm->avail_in = 1; |
| 283 | ret = inflate(strm, Z_NO_FLUSH); |
| 284 | if (ret == Z_DATA_ERROR) { |
| 285 | gz->err = Z_DATA_ERROR; |
| 286 | gz->msg = strm->msg; |
| 287 | return 0; |
| 288 | } |
| 289 | if (ret == Z_STREAM_END) |
| 290 | inflateReset(strm); |
| 291 | } while (strm->avail_out); |
| 292 | return len - strm->avail_out; |
| 293 | } |
| 294 | |
| 295 | int gzclose OF((gzFile)); |
| 296 | |
| 297 | int gzclose(gz) |
| 298 | gzFile gz; |
| 299 | { |
| 300 | z_stream *strm; |
| 301 | unsigned char out[BUFLEN]; |
| 302 | |
| 303 | if (gz == NULL) |
| 304 | return Z_STREAM_ERROR; |
| 305 | strm = &(gz->strm); |
| 306 | if (gz->write) { |
| 307 | strm->next_in = Z_NULL; |
| 308 | strm->avail_in = 0; |
| 309 | do { |
| 310 | strm->next_out = out; |
| 311 | strm->avail_out = BUFLEN; |
| 312 | (void)deflate(strm, Z_FINISH); |
| 313 | fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); |
| 314 | } while (strm->avail_out == 0); |
| 315 | deflateEnd(strm); |
| 316 | } |
| 317 | else |
| 318 | inflateEnd(strm); |
| 319 | fclose(gz->file); |
| 320 | free(gz); |
| 321 | return Z_OK; |
| 322 | } |
| 323 | |
| 324 | const char *gzerror OF((gzFile, int *)); |
| 325 | |
| 326 | const char *gzerror(gz, err) |
| 327 | gzFile gz; |
| 328 | int *err; |
| 329 | { |
| 330 | *err = gz->err; |
| 331 | return gz->msg; |
| 332 | } |
| 333 | |
| 334 | #endif |
| 335 | |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 336 | char *prog; |
| 337 | |
| 338 | void error OF((const char *msg)); |
| 339 | void gz_compress OF((FILE *in, gzFile out)); |
| 340 | #ifdef USE_MMAP |
| 341 | int gz_compress_mmap OF((FILE *in, gzFile out)); |
| 342 | #endif |
| 343 | void gz_uncompress OF((gzFile in, FILE *out)); |
| 344 | void file_compress OF((char *file, char *mode)); |
| 345 | void file_uncompress OF((char *file)); |
| 346 | int main OF((int argc, char *argv[])); |
| 347 | |
| 348 | /* =========================================================================== |
| 349 | * Display error message and exit |
| 350 | */ |
| 351 | void error(msg) |
| 352 | const char *msg; |
| 353 | { |
| 354 | fprintf(stderr, "%s: %s\n", prog, msg); |
| 355 | exit(1); |
| 356 | } |
| 357 | |
| 358 | /* =========================================================================== |
| 359 | * Compress input to output then close both files. |
| 360 | */ |
| 361 | |
| 362 | void gz_compress(in, out) |
| 363 | FILE *in; |
| 364 | gzFile out; |
| 365 | { |
| 366 | local char buf[BUFLEN]; |
| 367 | int len; |
| 368 | int err; |
| 369 | |
| 370 | #ifdef USE_MMAP |
| 371 | /* Try first compressing with mmap. If mmap fails (minigzip used in a |
| 372 | * pipe), use the normal fread loop. |
| 373 | */ |
| 374 | if (gz_compress_mmap(in, out) == Z_OK) return; |
| 375 | #endif |
| 376 | for (;;) { |
| 377 | len = (int)fread(buf, 1, sizeof(buf), in); |
| 378 | if (ferror(in)) { |
| 379 | perror("fread"); |
| 380 | exit(1); |
| 381 | } |
| 382 | if (len == 0) break; |
| 383 | |
| 384 | if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err)); |
| 385 | } |
| 386 | fclose(in); |
| 387 | if (gzclose(out) != Z_OK) error("failed gzclose"); |
| 388 | } |
| 389 | |
| 390 | #ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */ |
| 391 | |
| 392 | /* Try compressing the input file at once using mmap. Return Z_OK if |
| 393 | * if success, Z_ERRNO otherwise. |
| 394 | */ |
| 395 | int gz_compress_mmap(in, out) |
| 396 | FILE *in; |
| 397 | gzFile out; |
| 398 | { |
| 399 | int len; |
| 400 | int err; |
| 401 | int ifd = fileno(in); |
| 402 | caddr_t buf; /* mmap'ed buffer for the entire input file */ |
| 403 | off_t buf_len; /* length of the input file */ |
| 404 | struct stat sb; |
| 405 | |
| 406 | /* Determine the size of the file, needed for mmap: */ |
| 407 | if (fstat(ifd, &sb) < 0) return Z_ERRNO; |
| 408 | buf_len = sb.st_size; |
| 409 | if (buf_len <= 0) return Z_ERRNO; |
| 410 | |
| 411 | /* Now do the actual mmap: */ |
| 412 | buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0); |
| 413 | if (buf == (caddr_t)(-1)) return Z_ERRNO; |
| 414 | |
| 415 | /* Compress the whole file at once: */ |
| 416 | len = gzwrite(out, (char *)buf, (unsigned)buf_len); |
| 417 | |
| 418 | if (len != (int)buf_len) error(gzerror(out, &err)); |
| 419 | |
| 420 | munmap(buf, buf_len); |
| 421 | fclose(in); |
| 422 | if (gzclose(out) != Z_OK) error("failed gzclose"); |
| 423 | return Z_OK; |
| 424 | } |
| 425 | #endif /* USE_MMAP */ |
| 426 | |
| 427 | /* =========================================================================== |
| 428 | * Uncompress input to output then close both files. |
| 429 | */ |
| 430 | void gz_uncompress(in, out) |
| 431 | gzFile in; |
| 432 | FILE *out; |
| 433 | { |
| 434 | local char buf[BUFLEN]; |
| 435 | int len; |
| 436 | int err; |
| 437 | |
| 438 | for (;;) { |
| 439 | len = gzread(in, buf, sizeof(buf)); |
| 440 | if (len < 0) error (gzerror(in, &err)); |
| 441 | if (len == 0) break; |
| 442 | |
| 443 | if ((int)fwrite(buf, 1, (unsigned)len, out) != len) { |
| 444 | error("failed fwrite"); |
| 445 | } |
| 446 | } |
| 447 | if (fclose(out)) error("failed fclose"); |
| 448 | |
| 449 | if (gzclose(in) != Z_OK) error("failed gzclose"); |
| 450 | } |
| 451 | |
| 452 | |
| 453 | /* =========================================================================== |
| 454 | * Compress the given file: create a corresponding .gz file and remove the |
| 455 | * original. |
| 456 | */ |
| 457 | void file_compress(file, mode) |
| 458 | char *file; |
| 459 | char *mode; |
| 460 | { |
| 461 | local char outfile[MAX_NAME_LEN]; |
| 462 | FILE *in; |
| 463 | gzFile out; |
| 464 | |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 465 | if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) { |
| 466 | fprintf(stderr, "%s: filename too long\n", prog); |
| 467 | exit(1); |
| 468 | } |
| 469 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 470 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
| 471 | snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX); |
| 472 | #else |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 473 | strcpy(outfile, file); |
| 474 | strcat(outfile, GZ_SUFFIX); |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 475 | #endif |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 476 | |
| 477 | in = fopen(file, "rb"); |
| 478 | if (in == NULL) { |
| 479 | perror(file); |
| 480 | exit(1); |
| 481 | } |
| 482 | out = gzopen(outfile, mode); |
| 483 | if (out == NULL) { |
| 484 | fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile); |
| 485 | exit(1); |
| 486 | } |
| 487 | gz_compress(in, out); |
| 488 | |
| 489 | unlink(file); |
| 490 | } |
| 491 | |
| 492 | |
| 493 | /* =========================================================================== |
| 494 | * Uncompress the given file and remove the original. |
| 495 | */ |
| 496 | void file_uncompress(file) |
| 497 | char *file; |
| 498 | { |
| 499 | local char buf[MAX_NAME_LEN]; |
| 500 | char *infile, *outfile; |
| 501 | FILE *out; |
| 502 | gzFile in; |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 503 | size_t len = strlen(file); |
| 504 | |
| 505 | if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) { |
| 506 | fprintf(stderr, "%s: filename too long\n", prog); |
| 507 | exit(1); |
| 508 | } |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 509 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 510 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
| 511 | snprintf(buf, sizeof(buf), "%s", file); |
| 512 | #else |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 513 | strcpy(buf, file); |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 514 | #endif |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 515 | |
| 516 | if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) { |
| 517 | infile = file; |
| 518 | outfile = buf; |
| 519 | outfile[len-3] = '\0'; |
| 520 | } else { |
| 521 | outfile = file; |
| 522 | infile = buf; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 523 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
| 524 | snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX); |
| 525 | #else |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 526 | strcat(infile, GZ_SUFFIX); |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 527 | #endif |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 528 | } |
| 529 | in = gzopen(infile, "rb"); |
| 530 | if (in == NULL) { |
| 531 | fprintf(stderr, "%s: can't gzopen %s\n", prog, infile); |
| 532 | exit(1); |
| 533 | } |
| 534 | out = fopen(outfile, "wb"); |
| 535 | if (out == NULL) { |
| 536 | perror(file); |
| 537 | exit(1); |
| 538 | } |
| 539 | |
| 540 | gz_uncompress(in, out); |
| 541 | |
| 542 | unlink(infile); |
| 543 | } |
| 544 | |
| 545 | |
| 546 | /* =========================================================================== |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 547 | * Usage: minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...] |
| 548 | * -c : write to standard output |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 549 | * -d : decompress |
| 550 | * -f : compress with Z_FILTERED |
| 551 | * -h : compress with Z_HUFFMAN_ONLY |
| 552 | * -r : compress with Z_RLE |
| 553 | * -1 to -9 : compression level |
| 554 | */ |
| 555 | |
| 556 | int main(argc, argv) |
| 557 | int argc; |
| 558 | char *argv[]; |
| 559 | { |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 560 | int copyout = 0; |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 561 | int uncompr = 0; |
| 562 | gzFile file; |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 563 | char *bname, outmode[20]; |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 564 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 565 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
| 566 | snprintf(outmode, sizeof(outmode), "%s", "wb6 "); |
| 567 | #else |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 568 | strcpy(outmode, "wb6 "); |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 569 | #endif |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 570 | |
| 571 | prog = argv[0]; |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 572 | bname = strrchr(argv[0], '/'); |
| 573 | if (bname) |
| 574 | bname++; |
| 575 | else |
| 576 | bname = argv[0]; |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 577 | argc--, argv++; |
| 578 | |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 579 | if (!strcmp(bname, "gunzip")) |
| 580 | uncompr = 1; |
| 581 | else if (!strcmp(bname, "zcat")) |
| 582 | copyout = uncompr = 1; |
| 583 | |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 584 | while (argc > 0) { |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 585 | if (strcmp(*argv, "-c") == 0) |
| 586 | copyout = 1; |
| 587 | else if (strcmp(*argv, "-d") == 0) |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 588 | uncompr = 1; |
| 589 | else if (strcmp(*argv, "-f") == 0) |
| 590 | outmode[3] = 'f'; |
| 591 | else if (strcmp(*argv, "-h") == 0) |
| 592 | outmode[3] = 'h'; |
| 593 | else if (strcmp(*argv, "-r") == 0) |
| 594 | outmode[3] = 'R'; |
| 595 | else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' && |
| 596 | (*argv)[2] == 0) |
| 597 | outmode[2] = (*argv)[1]; |
| 598 | else |
| 599 | break; |
| 600 | argc--, argv++; |
| 601 | } |
| 602 | if (outmode[3] == ' ') |
| 603 | outmode[3] = 0; |
| 604 | if (argc == 0) { |
| 605 | SET_BINARY_MODE(stdin); |
| 606 | SET_BINARY_MODE(stdout); |
| 607 | if (uncompr) { |
| 608 | file = gzdopen(fileno(stdin), "rb"); |
| 609 | if (file == NULL) error("can't gzdopen stdin"); |
| 610 | gz_uncompress(file, stdout); |
| 611 | } else { |
| 612 | file = gzdopen(fileno(stdout), outmode); |
| 613 | if (file == NULL) error("can't gzdopen stdout"); |
| 614 | gz_compress(stdin, file); |
| 615 | } |
| 616 | } else { |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 617 | if (copyout) { |
| 618 | SET_BINARY_MODE(stdout); |
| 619 | } |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 620 | do { |
| 621 | if (uncompr) { |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 622 | if (copyout) { |
| 623 | file = gzopen(*argv, "rb"); |
| 624 | if (file == NULL) |
| 625 | fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv); |
| 626 | else |
| 627 | gz_uncompress(file, stdout); |
| 628 | } else { |
| 629 | file_uncompress(*argv); |
| 630 | } |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 631 | } else { |
Martin v. Löwis | ce126ed | 2010-07-30 20:03:17 +0000 | [diff] [blame] | 632 | if (copyout) { |
| 633 | FILE * in = fopen(*argv, "rb"); |
| 634 | |
| 635 | if (in == NULL) { |
| 636 | perror(*argv); |
| 637 | } else { |
| 638 | file = gzdopen(fileno(stdout), outmode); |
| 639 | if (file == NULL) error("can't gzdopen stdout"); |
| 640 | |
| 641 | gz_compress(in, file); |
| 642 | } |
| 643 | |
| 644 | } else { |
| 645 | file_compress(*argv, outmode); |
| 646 | } |
Martin v. Löwis | d372aa8 | 2006-01-03 06:44:59 +0000 | [diff] [blame] | 647 | } |
| 648 | } while (argv++, --argc); |
| 649 | } |
| 650 | return 0; |
| 651 | } |