usr/src/boot/lib/libz/gzwrite.c

   1 /* gzwrite.c -- zlib functions for writing gzip files
   2  * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
   3  * For conditions of distribution and use, see copyright notice in zlib.h
   4  */
   5
   6 /* $FreeBSD$ */
   7
   8 #include "gzguts.h"
   9 #include <unistd.h>
  10
  11 /* Local functions */
  12 local int gz_init OF((gz_statep));
  13 local int gz_comp OF((gz_statep, int));
  14 local int gz_zero OF((gz_statep, z_off64_t));
  15
  16 /* Initialize state for writing a gzip file.  Mark initialization by setting
  17    state->size to non-zero.  Return -1 on failure or 0 on success. */
  18 local int gz_init(state)
  19     gz_statep state;
  20 {
  21     int ret;
  22     z_streamp strm = &(state->strm);
  23
  24     /* allocate input buffer */
  25     state->in = (unsigned char *)malloc(state->want);
  26     if (state->in == NULL) {
  27         gz_error(state, Z_MEM_ERROR, "out of memory");
  28         return -1;
  29     }
  30
  31     /* only need output buffer and deflate state if compressing */
  32     if (!state->direct) {
  33         /* allocate output buffer */
  34         state->out = (unsigned char *)malloc(state->want);
  35         if (state->out == NULL) {
  36             free(state->in);
  37             gz_error(state, Z_MEM_ERROR, "out of memory");
  38             return -1;
  39         }
  40
  41         /* allocate deflate memory, set up for gzip compression */
  42         strm->zalloc = Z_NULL;
  43         strm->zfree = Z_NULL;
  44         strm->opaque = Z_NULL;
  45         ret = deflateInit2(strm, state->level, Z_DEFLATED,
  46                            MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
  47         if (ret != Z_OK) {
  48             free(state->out);
  49             free(state->in);
  50             gz_error(state, Z_MEM_ERROR, "out of memory");
  51             return -1;
  52         }
  53     }
  54
  55     /* mark state as initialized */
  56     state->size = state->want;
  57
  58     /* initialize write buffer if compressing */
  59     if (!state->direct) {
  60         strm->avail_out = state->size;
  61         strm->next_out = state->out;
  62         state->x.next = strm->next_out;
  63     }
  64     return 0;
  65 }
  66
  67 /* Compress whatever is at avail_in and next_in and write to the output file.
  68    Return -1 if there is an error writing to the output file, otherwise 0.
  69    flush is assumed to be a valid deflate() flush value.  If flush is Z_FINISH,
  70    then the deflate() state is reset to start a new gzip stream.  If gz->direct
  71    is true, then simply write to the output file without compressing, and
  72    ignore flush. */
  73 local int gz_comp(state, flush)
  74     gz_statep state;
  75     int flush;
  76 {
  77     int ret, got;
  78     unsigned have;
  79     z_streamp strm = &(state->strm);
  80
  81     /* allocate memory if this is the first time through */
  82     if (state->size == 0 && gz_init(state) == -1)
  83         return -1;
  84
  85     /* write directly if requested */
  86     if (state->direct) {
  87         got = write(state->fd, strm->next_in, strm->avail_in);
  88         if (got < 0 || (unsigned)got != strm->avail_in) {
  89             gz_error(state, Z_ERRNO, zstrerror());
  90             return -1;
  91         }
  92         strm->avail_in = 0;
  93         return 0;
  94     }
  95
  96     /* run deflate() on provided input until it produces no more output */
  97     ret = Z_OK;
  98     do {
  99         /* write out current buffer contents if full, or if flushing, but if
 100            doing Z_FINISH then don't write until we get to Z_STREAM_END */
 101         if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
 102             (flush != Z_FINISH || ret == Z_STREAM_END))) {
 103             have = (unsigned)(strm->next_out - state->x.next);
 104             if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||
 105                          (unsigned)got != have)) {
 106                 gz_error(state, Z_ERRNO, zstrerror());
 107                 return -1;
 108             }
 109             if (strm->avail_out == 0) {
 110                 strm->avail_out = state->size;
 111                 strm->next_out = state->out;
 112             }
 113             state->x.next = strm->next_out;
 114         }
 115
 116         /* compress */
 117         have = strm->avail_out;
 118         ret = deflate(strm, flush);
 119         if (ret == Z_STREAM_ERROR) {
 120             gz_error(state, Z_STREAM_ERROR,
 121                       "internal error: deflate stream corrupt");
 122             return -1;
 123         }
 124         have -= strm->avail_out;
 125     } while (have);
 126
 127     /* if that completed a deflate stream, allow another to start */
 128     if (flush == Z_FINISH)
 129         deflateReset(strm);
 130
 131     /* all done, no errors */
 132     return 0;
 133 }
 134
 135 /* Compress len zeros to output.  Return -1 on error, 0 on success. */
 136 local int gz_zero(state, len)
 137     gz_statep state;
 138     z_off64_t len;
 139 {
 140     int first;
 141     unsigned n;
 142     z_streamp strm = &(state->strm);
 143
 144     /* consume whatever's left in the input buffer */
 145     if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
 146         return -1;
 147
 148     /* compress len zeros (len guaranteed > 0) */
 149     first = 1;
 150     while (len) {
 151         n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
 152             (unsigned)len : state->size;
 153         if (first) {
 154             memset(state->in, 0, n);
 155             first = 0;
 156         }
 157         strm->avail_in = n;
 158         strm->next_in = state->in;
 159         state->x.pos += n;
 160         if (gz_comp(state, Z_NO_FLUSH) == -1)
 161             return -1;
 162         len -= n;
 163     }
 164     return 0;
 165 }
 166
 167 /* -- see zlib.h -- */
 168 int ZEXPORT gzwrite(file, buf, len)
 169     gzFile file;
 170     voidpc buf;
 171     unsigned len;
 172 {
 173     unsigned put = len;
 174     gz_statep state;
 175     z_streamp strm;
 176
 177     /* get internal structure */
 178     if (file == NULL)
 179         return 0;
 180     state = (gz_statep)file;
 181     strm = &(state->strm);
 182
 183     /* check that we're writing and that there's no error */
 184     if (state->mode != GZ_WRITE || state->err != Z_OK)
 185         return 0;
 186
 187     /* since an int is returned, make sure len fits in one, otherwise return
 188        with an error (this avoids the flaw in the interface) */
 189     if ((int)len < 0) {
 190         gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
 191         return 0;
 192     }
 193
 194     /* if len is zero, avoid unnecessary operations */
 195     if (len == 0)
 196         return 0;
 197
 198     /* allocate memory if this is the first time through */
 199     if (state->size == 0 && gz_init(state) == -1)
 200         return 0;
 201
 202     /* check for seek request */
 203     if (state->seek) {
 204         state->seek = 0;
 205         if (gz_zero(state, state->skip) == -1)
 206             return 0;
 207     }
 208
 209     /* for small len, copy to input buffer, otherwise compress directly */
 210     if (len < state->size) {
 211         /* copy to input buffer, compress when full */
 212         do {
 213             unsigned have, copy;
 214
 215             if (strm->avail_in == 0)
 216                 strm->next_in = state->in;
 217             have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
 218             copy = state->size - have;
 219             if (copy > len)
 220                 copy = len;
 221             memcpy(state->in + have, buf, copy);
 222             strm->avail_in += copy;
 223             state->x.pos += copy;
 224             buf = (const char *)buf + copy;
 225             len -= copy;
 226             if (len && gz_comp(state, Z_NO_FLUSH) == -1)
 227                 return 0;
 228         } while (len);
 229     }
 230     else {
 231         /* consume whatever's left in the input buffer */
 232         if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
 233             return 0;
 234
 235         /* directly compress user buffer to file */
 236         strm->avail_in = len;
 237         strm->next_in = (z_const Bytef *)buf;
 238         state->x.pos += len;
 239         if (gz_comp(state, Z_NO_FLUSH) == -1)
 240             return 0;
 241     }
 242
 243     /* input was all buffered or compressed (put will fit in int) */
 244     return (int)put;
 245 }
 246
 247 /* -- see zlib.h -- */
 248 int ZEXPORT gzputc(file, c)
 249     gzFile file;
 250     int c;
 251 {
 252     unsigned have;
 253     unsigned char buf[1];
 254     gz_statep state;
 255     z_streamp strm;
 256
 257     /* get internal structure */
 258     if (file == NULL)
 259         return -1;
 260     state = (gz_statep)file;
 261     strm = &(state->strm);
 262
 263     /* check that we're writing and that there's no error */
 264     if (state->mode != GZ_WRITE || state->err != Z_OK)
 265         return -1;
 266
 267     /* check for seek request */
 268     if (state->seek) {
 269         state->seek = 0;
 270         if (gz_zero(state, state->skip) == -1)
 271             return -1;
 272     }
 273
 274     /* try writing to input buffer for speed (state->size == 0 if buffer not
 275        initialized) */
 276     if (state->size) {
 277         if (strm->avail_in == 0)
 278             strm->next_in = state->in;
 279         have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
 280         if (have < state->size) {
 281             state->in[have] = c;
 282             strm->avail_in++;
 283             state->x.pos++;
 284             return c & 0xff;
 285         }
 286     }
 287
 288     /* no room in buffer or not initialized, use gz_write() */
 289     buf[0] = c;
 290     if (gzwrite(file, buf, 1) != 1)
 291         return -1;
 292     return c & 0xff;
 293 }
 294
 295 /* -- see zlib.h -- */
 296 int ZEXPORT gzputs(file, str)
 297     gzFile file;
 298     const char *str;
 299 {
 300     int ret;
 301     unsigned len;
 302
 303     /* write string */
 304     len = (unsigned)strlen(str);
 305     ret = gzwrite(file, str, len);
 306     return ret == 0 && len != 0 ? -1 : ret;
 307 }
 308
 309 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
 310 #include <stdarg.h>
 311
 312 /* -- see zlib.h -- */
 313 int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
 314 {
 315     int size, len;
 316     gz_statep state;
 317     z_streamp strm;
 318
 319     /* get internal structure */
 320     if (file == NULL)
 321         return -1;
 322     state = (gz_statep)file;
 323     strm = &(state->strm);
 324
 325     /* check that we're writing and that there's no error */
 326     if (state->mode != GZ_WRITE || state->err != Z_OK)
 327         return 0;
 328
 329     /* make sure we have some buffer space */
 330     if (state->size == 0 && gz_init(state) == -1)
 331         return 0;
 332
 333     /* check for seek request */
 334     if (state->seek) {
 335         state->seek = 0;
 336         if (gz_zero(state, state->skip) == -1)
 337             return 0;
 338     }
 339
 340     /* consume whatever's left in the input buffer */
 341     if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
 342         return 0;
 343
 344     /* do the printf() into the input buffer, put length in len */
 345     size = (int)(state->size);
 346     state->in[size - 1] = 0;
 347 #ifdef NO_vsnprintf
 348 #  ifdef HAS_vsprintf_void
 349     (void)vsprintf((char *)(state->in), format, va);
 350     for (len = 0; len < size; len++)
 351         if (state->in[len] == 0) break;
 352 #  else
 353     len = vsprintf((char *)(state->in), format, va);
 354 #  endif
 355 #else
 356 #  ifdef HAS_vsnprintf_void
 357     (void)vsnprintf((char *)(state->in), size, format, va);
 358     len = strlen((char *)(state->in));
 359 #  else
 360     len = vsnprintf((char *)(state->in), size, format, va);
 361 #  endif
 362 #endif
 363
 364     /* check that printf() results fit in buffer */
 365     if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
 366         return 0;
 367
 368     /* update buffer and position, defer compression until needed */
 369     strm->avail_in = (unsigned)len;
 370     strm->next_in = state->in;
 371     state->x.pos += len;
 372     return len;
 373 }
 374
 375 int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
 376 {
 377     va_list va;
 378     int ret;
 379
 380     va_start(va, format);
 381     ret = gzvprintf(file, format, va);
 382     va_end(va);
 383     return ret;
 384 }
 385
 386 #else /* !STDC && !Z_HAVE_STDARG_H */
 387
 388 /* -- see zlib.h -- */
 389 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
 390                        a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
 391     gzFile file;
 392     const char *format;
 393     int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
 394         a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
 395 {
 396     int size, len;
 397     gz_statep state;
 398     z_streamp strm;
 399
 400     /* get internal structure */
 401     if (file == NULL)
 402         return -1;
 403     state = (gz_statep)file;
 404     strm = &(state->strm);
 405
 406     /* check that can really pass pointer in ints */
 407     if (sizeof(int) != sizeof(void *))
 408         return 0;
 409
 410     /* check that we're writing and that there's no error */
 411     if (state->mode != GZ_WRITE || state->err != Z_OK)
 412         return 0;
 413
 414     /* make sure we have some buffer space */
 415     if (state->size == 0 && gz_init(state) == -1)
 416         return 0;
 417
 418     /* check for seek request */
 419     if (state->seek) {
 420         state->seek = 0;
 421         if (gz_zero(state, state->skip) == -1)
 422             return 0;
 423     }
 424
 425     /* consume whatever's left in the input buffer */
 426     if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
 427         return 0;
 428
 429     /* do the printf() into the input buffer, put length in len */
 430     size = (int)(state->size);
 431     state->in[size - 1] = 0;
 432 #ifdef NO_snprintf
 433 #  ifdef HAS_sprintf_void
 434     sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
 435             a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
 436     for (len = 0; len < size; len++)
 437         if (state->in[len] == 0) break;
 438 #  else
 439     len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
 440                   a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
 441 #  endif
 442 #else
 443 #  ifdef HAS_snprintf_void
 444     snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
 445              a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
 446     len = strlen((char *)(state->in));
 447 #  else
 448     len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
 449                    a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
 450                    a19, a20);
 451 #  endif
 452 #endif
 453
 454     /* check that printf() results fit in buffer */
 455     if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
 456         return 0;
 457
 458     /* update buffer and position, defer compression until needed */
 459     strm->avail_in = (unsigned)len;
 460     strm->next_in = state->in;
 461     state->x.pos += len;
 462     return len;
 463 }
 464
 465 #endif
 466
 467 /* -- see zlib.h -- */
 468 int ZEXPORT gzflush(file, flush)
 469     gzFile file;
 470     int flush;
 471 {
 472     gz_statep state;
 473
 474     /* get internal structure */
 475     if (file == NULL)
 476         return -1;
 477     state = (gz_statep)file;
 478
 479     /* check that we're writing and that there's no error */
 480     if (state->mode != GZ_WRITE || state->err != Z_OK)
 481         return Z_STREAM_ERROR;
 482
 483     /* check flush parameter */
 484     if (flush < 0 || flush > Z_FINISH)
 485         return Z_STREAM_ERROR;
 486
 487     /* check for seek request */
 488     if (state->seek) {
 489         state->seek = 0;
 490         if (gz_zero(state, state->skip) == -1)
 491             return -1;
 492     }
 493
 494     /* compress remaining data with requested flush */
 495     gz_comp(state, flush);
 496     return state->err;
 497 }
 498
 499 /* -- see zlib.h -- */
 500 int ZEXPORT gzsetparams(file, level, strategy)
 501     gzFile file;
 502     int level;
 503     int strategy;
 504 {
 505     gz_statep state;
 506     z_streamp strm;
 507
 508     /* get internal structure */
 509     if (file == NULL)
 510         return Z_STREAM_ERROR;
 511     state = (gz_statep)file;
 512     strm = &(state->strm);
 513
 514     /* check that we're writing and that there's no error */
 515     if (state->mode != GZ_WRITE || state->err != Z_OK)
 516         return Z_STREAM_ERROR;
 517
 518     /* if no change is requested, then do nothing */
 519     if (level == state->level && strategy == state->strategy)
 520         return Z_OK;
 521
 522     /* check for seek request */
 523     if (state->seek) {
 524         state->seek = 0;
 525         if (gz_zero(state, state->skip) == -1)
 526             return -1;
 527     }
 528
 529     /* change compression parameters for subsequent input */
 530     if (state->size) {
 531         /* flush previous input with previous parameters before changing */
 532         if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
 533             return state->err;
 534         deflateParams(strm, level, strategy);
 535     }
 536     state->level = level;
 537     state->strategy = strategy;
 538     return Z_OK;
 539 }
 540
 541 /* -- see zlib.h -- */
 542 int ZEXPORT gzclose_w(file)
 543     gzFile file;
 544 {
 545     int ret = Z_OK;
 546     gz_statep state;
 547
 548     /* get internal structure */
 549     if (file == NULL)
 550         return Z_STREAM_ERROR;
 551     state = (gz_statep)file;
 552
 553     /* check that we're writing */
 554     if (state->mode != GZ_WRITE)
 555         return Z_STREAM_ERROR;
 556
 557     /* check for seek request */
 558     if (state->seek) {
 559         state->seek = 0;
 560         if (gz_zero(state, state->skip) == -1)
 561             ret = state->err;
 562     }
 563
 564     /* flush, free memory, and close file */
 565     if (gz_comp(state, Z_FINISH) == -1)
 566         ret = state->err;
 567     if (state->size) {
 568         if (!state->direct) {
 569             (void)deflateEnd(&(state->strm));
 570             free(state->out);
 571         }
 572         free(state->in);
 573     }
 574     gz_error(state, Z_OK, NULL);
 575     free(state->path);
 576     if (close(state->fd) == -1)
 577         ret = Z_ERRNO;
 578     free(state);
 579     return ret;
 580 }