gzwrite.c 18.8 KB
Newer Older
M
Mark Adler 已提交
1
/* gzwrite.c -- zlib functions for writing gzip files
M
Mark Adler 已提交
2
 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
M
Mark Adler 已提交
3 4 5 6 7 8 9 10
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include "gzguts.h"

/* Local functions */
local int gz_init OF((gz_statep));
local int gz_comp OF((gz_statep, int));
M
Mark Adler 已提交
11
local int gz_zero OF((gz_statep, z_off64_t));
12
local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));
M
Mark Adler 已提交
13 14

/* Initialize state for writing a gzip file.  Mark initialization by setting
M
Mark Adler 已提交
15 16
   state->size to non-zero.  Return -1 on a memory allocation failure, or 0 on
   success. */
M
Mark Adler 已提交
17 18 19 20 21 22
local int gz_init(state)
    gz_statep state;
{
    int ret;
    z_streamp strm = &(state->strm);

23 24
    /* allocate input buffer (double size for gzprintf) */
    state->in = (unsigned char *)malloc(state->want << 1);
25
    if (state->in == NULL) {
M
Mark Adler 已提交
26 27 28 29
        gz_error(state, Z_MEM_ERROR, "out of memory");
        return -1;
    }

30 31 32
    /* only need output buffer and deflate state if compressing */
    if (!state->direct) {
        /* allocate output buffer */
33
        state->out = (unsigned char *)malloc(state->want);
34 35 36 37 38 39 40 41 42 43 44
        if (state->out == NULL) {
            free(state->in);
            gz_error(state, Z_MEM_ERROR, "out of memory");
            return -1;
        }

        /* allocate deflate memory, set up for gzip compression */
        strm->zalloc = Z_NULL;
        strm->zfree = Z_NULL;
        strm->opaque = Z_NULL;
        ret = deflateInit2(strm, state->level, Z_DEFLATED,
45
                           MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
46 47 48 49 50 51
        if (ret != Z_OK) {
            free(state->out);
            free(state->in);
            gz_error(state, Z_MEM_ERROR, "out of memory");
            return -1;
        }
52
        strm->next_in = NULL;
M
Mark Adler 已提交
53 54 55 56 57
    }

    /* mark state as initialized */
    state->size = state->want;

58 59 60 61 62 63
    /* initialize write buffer if compressing */
    if (!state->direct) {
        strm->avail_out = state->size;
        strm->next_out = state->out;
        state->x.next = strm->next_out;
    }
M
Mark Adler 已提交
64 65 66 67
    return 0;
}

/* Compress whatever is at avail_in and next_in and write to the output file.
M
Mark Adler 已提交
68 69 70 71 72
   Return -1 if there is an error writing to the output file or if gz_init()
   fails to allocate memory, otherwise 0.  flush is assumed to be a valid
   deflate() flush value.  If flush is Z_FINISH, then the deflate() state is
   reset to start a new gzip stream.  If gz->direct is true, then simply write
   to the output file without compressing, and ignore flush. */
M
Mark Adler 已提交
73 74 75 76
local int gz_comp(state, flush)
    gz_statep state;
    int flush;
{
M
Mark Adler 已提交
77 78
    int ret, writ;
    unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
M
Mark Adler 已提交
79 80 81 82 83 84
    z_streamp strm = &(state->strm);

    /* allocate memory if this is the first time through */
    if (state->size == 0 && gz_init(state) == -1)
        return -1;

85 86
    /* write directly if requested */
    if (state->direct) {
87
        while (strm->avail_in) {
M
Mark Adler 已提交
88 89 90
            put = strm->avail_in > max ? max : strm->avail_in;
            writ = write(state->fd, strm->next_in, put);
            if (writ < 0) {
91 92 93
                gz_error(state, Z_ERRNO, zstrerror());
                return -1;
            }
M
Mark Adler 已提交
94 95
            strm->avail_in -= (unsigned)writ;
            strm->next_in += writ;
96 97 98 99
        }
        return 0;
    }

M
Mark Adler 已提交
100 101 102 103 104 105 106
    /* run deflate() on provided input until it produces no more output */
    ret = Z_OK;
    do {
        /* write out current buffer contents if full, or if flushing, but if
           doing Z_FINISH then don't write until we get to Z_STREAM_END */
        if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
            (flush != Z_FINISH || ret == Z_STREAM_END))) {
107
            while (strm->next_out > state->x.next) {
M
Mark Adler 已提交
108 109 110 111
                put = strm->next_out - state->x.next > (int)max ? max :
                      (unsigned)(strm->next_out - state->x.next);
                writ = write(state->fd, state->x.next, put);
                if (writ < 0) {
112 113 114
                    gz_error(state, Z_ERRNO, zstrerror());
                    return -1;
                }
M
Mark Adler 已提交
115
                state->x.next += writ;
M
Mark Adler 已提交
116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141
            }
            if (strm->avail_out == 0) {
                strm->avail_out = state->size;
                strm->next_out = state->out;
            }
        }

        /* compress */
        have = strm->avail_out;
        ret = deflate(strm, flush);
        if (ret == Z_STREAM_ERROR) {
            gz_error(state, Z_STREAM_ERROR,
                      "internal error: deflate stream corrupt");
            return -1;
        }
        have -= strm->avail_out;
    } while (have);

    /* if that completed a deflate stream, allow another to start */
    if (flush == Z_FINISH)
        deflateReset(strm);

    /* all done, no errors */
    return 0;
}

M
Mark Adler 已提交
142 143
/* Compress len zeros to output.  Return -1 on a write error or memory
   allocation failure by gz_comp(), or 0 on success. */
M
Mark Adler 已提交
144 145
local int gz_zero(state, len)
    gz_statep state;
M
Mark Adler 已提交
146
    z_off64_t len;
M
Mark Adler 已提交
147 148 149 150 151 152 153 154 155
{
    int first;
    unsigned n;
    z_streamp strm = &(state->strm);

    /* consume whatever's left in the input buffer */
    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
        return -1;

M
Mark Adler 已提交
156
    /* compress len zeros (len guaranteed > 0) */
M
Mark Adler 已提交
157 158
    first = 1;
    while (len) {
M
Mark Adler 已提交
159 160
        n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
            (unsigned)len : state->size;
M
Mark Adler 已提交
161 162 163 164 165 166
        if (first) {
            memset(state->in, 0, n);
            first = 0;
        }
        strm->avail_in = n;
        strm->next_in = state->in;
167
        state->x.pos += n;
M
Mark Adler 已提交
168 169 170 171 172 173 174
        if (gz_comp(state, Z_NO_FLUSH) == -1)
            return -1;
        len -= n;
    }
    return 0;
}

175 176 177 178
/* Write len bytes from buf to file.  Return the number of bytes written.  If
   the returned value is less than len, then there was an error. */
local z_size_t gz_write(state, buf, len)
    gz_statep state;
M
Mark Adler 已提交
179
    voidpc buf;
180
    z_size_t len;
M
Mark Adler 已提交
181
{
182
    z_size_t put = len;
M
Mark Adler 已提交
183 184 185 186 187

    /* if len is zero, avoid unnecessary operations */
    if (len == 0)
        return 0;

M
Mark Adler 已提交
188 189
    /* allocate memory if this is the first time through */
    if (state->size == 0 && gz_init(state) == -1)
M
Mark Adler 已提交
190
        return 0;
M
Mark Adler 已提交
191 192 193 194 195

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
M
Mark Adler 已提交
196
            return 0;
M
Mark Adler 已提交
197 198 199 200 201
    }

    /* for small len, copy to input buffer, otherwise compress directly */
    if (len < state->size) {
        /* copy to input buffer, compress when full */
M
Mark Adler 已提交
202
        do {
203 204
            unsigned have, copy;

205 206 207 208
            if (state->strm.avail_in == 0)
                state->strm.next_in = state->in;
            have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
                              state->in);
209 210 211 212
            copy = state->size - have;
            if (copy > len)
                copy = len;
            memcpy(state->in + have, buf, copy);
213
            state->strm.avail_in += copy;
214 215 216
            state->x.pos += copy;
            buf = (const char *)buf + copy;
            len -= copy;
M
Mark Adler 已提交
217
            if (len && gz_comp(state, Z_NO_FLUSH) == -1)
M
Mark Adler 已提交
218
                return 0;
M
Mark Adler 已提交
219
        } while (len);
M
Mark Adler 已提交
220 221 222
    }
    else {
        /* consume whatever's left in the input buffer */
223
        if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
M
Mark Adler 已提交
224
            return 0;
M
Mark Adler 已提交
225 226

        /* directly compress user buffer to file */
227 228
        state->strm.next_in = (z_const Bytef *)buf;
        do {
229
            unsigned n = (unsigned)-1;
230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
            if (n > len)
                n = len;
            state->strm.avail_in = n;
            state->x.pos += n;
            if (gz_comp(state, Z_NO_FLUSH) == -1)
                return 0;
            len -= n;
        } while (len);
    }

    /* input was all buffered or compressed */
    return put;
}

/* -- see zlib.h -- */
int ZEXPORT gzwrite(file, buf, len)
    gzFile file;
    voidpc buf;
    unsigned len;
{
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;

    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids a flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
        return 0;
    }

    /* write len bytes from buf (the return value will fit in an int) */
    return (int)gz_write(state, buf, len);
}

/* -- see zlib.h -- */
z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
    voidpc buf;
    z_size_t size;
    z_size_t nitems;
    gzFile file;
{
    z_size_t len;
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;

    /* compute bytes to read -- error on overflow */
    len = nitems * size;
    if (size && len / size != nitems) {
        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
        return 0;
M
Mark Adler 已提交
296 297
    }

298 299
    /* write len bytes to buf, return the number of full items written */
    return len ? gz_write(state, buf, len) / size : 0;
M
Mark Adler 已提交
300 301 302 303 304 305 306
}

/* -- see zlib.h -- */
int ZEXPORT gzputc(file, c)
    gzFile file;
    int c;
{
307
    unsigned have;
M
Mark Adler 已提交
308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330
    unsigned char buf[1];
    gz_statep state;
    z_streamp strm;

    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    strm = &(state->strm);

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return -1;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
            return -1;
    }

    /* try writing to input buffer for speed (state->size == 0 if buffer not
       initialized) */
331 332 333
    if (state->size) {
        if (strm->avail_in == 0)
            strm->next_in = state->in;
334
        have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
335
        if (have < state->size) {
M
Mark Adler 已提交
336
            state->in[have] = (unsigned char)c;
337 338 339 340
            strm->avail_in++;
            state->x.pos++;
            return c & 0xff;
        }
M
Mark Adler 已提交
341 342 343
    }

    /* no room in buffer or not initialized, use gz_write() */
M
Mark Adler 已提交
344
    buf[0] = (unsigned char)c;
345
    if (gz_write(state, buf, 1) != 1)
M
Mark Adler 已提交
346
        return -1;
347
    return c & 0xff;
M
Mark Adler 已提交
348 349 350 351 352 353 354
}

/* -- see zlib.h -- */
int ZEXPORT gzputs(file, str)
    gzFile file;
    const char *str;
{
M
Mark Adler 已提交
355
    int ret;
356 357 358 359 360 361 362 363 364 365 366
    z_size_t len;
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return -1;
M
Mark Adler 已提交
367

M
Mark Adler 已提交
368
    /* write string */
369 370
    len = strlen(str);
    ret = gz_write(state, str, len);
M
Mark Adler 已提交
371
    return ret == 0 && len != 0 ? -1 : ret;
M
Mark Adler 已提交
372 373
}

M
Mark Adler 已提交
374
#if defined(STDC) || defined(Z_HAVE_STDARG_H)
M
Mark Adler 已提交
375 376 377
#include <stdarg.h>

/* -- see zlib.h -- */
378
int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
M
Mark Adler 已提交
379
{
M
Mark Adler 已提交
380 381
    int len;
    unsigned left;
382
    char *next;
M
Mark Adler 已提交
383 384 385 386 387
    gz_statep state;
    z_streamp strm;

    /* get internal structure */
    if (file == NULL)
M
Mark Adler 已提交
388
        return Z_STREAM_ERROR;
M
Mark Adler 已提交
389 390 391 392 393
    state = (gz_statep)file;
    strm = &(state->strm);

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
M
Mark Adler 已提交
394
        return Z_STREAM_ERROR;
M
Mark Adler 已提交
395 396 397

    /* make sure we have some buffer space */
    if (state->size == 0 && gz_init(state) == -1)
M
Mark Adler 已提交
398
        return state->err;
M
Mark Adler 已提交
399 400 401 402 403

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
M
Mark Adler 已提交
404
            return state->err;
M
Mark Adler 已提交
405 406
    }

407 408 409 410 411
    /* do the printf() into the input buffer, put length in len -- the input
       buffer is double-sized just for this function, so there is guaranteed to
       be state->size bytes available after the current contents */
    if (strm->avail_in == 0)
        strm->next_in = state->in;
M
Mark Adler 已提交
412
    next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
413
    next[state->size - 1] = 0;
M
Mark Adler 已提交
414 415
#ifdef NO_vsnprintf
#  ifdef HAS_vsprintf_void
416 417 418
    (void)vsprintf(next, format, va);
    for (len = 0; len < state->size; len++)
        if (next[len] == 0) break;
M
Mark Adler 已提交
419
#  else
420
    len = vsprintf(next, format, va);
M
Mark Adler 已提交
421 422 423
#  endif
#else
#  ifdef HAS_vsnprintf_void
424 425
    (void)vsnprintf(next, state->size, format, va);
    len = strlen(next);
M
Mark Adler 已提交
426
#  else
427
    len = vsnprintf(next, state->size, format, va);
M
Mark Adler 已提交
428 429 430 431
#  endif
#endif

    /* check that printf() results fit in buffer */
M
Mark Adler 已提交
432
    if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
M
Mark Adler 已提交
433 434
        return 0;

435
    /* update buffer and position, compress first half if past that */
M
Mark Adler 已提交
436
    strm->avail_in += (unsigned)len;
437
    state->x.pos += len;
438 439 440 441
    if (strm->avail_in >= state->size) {
        left = strm->avail_in - state->size;
        strm->avail_in = state->size;
        if (gz_comp(state, Z_NO_FLUSH) == -1)
M
Mark Adler 已提交
442
            return state->err;
443 444 445 446
        memcpy(state->in, state->in + state->size, left);
        strm->next_in = state->in;
        strm->avail_in = left;
    }
M
Mark Adler 已提交
447
    return len;
M
Mark Adler 已提交
448 449
}

450 451 452 453 454 455 456 457 458 459 460
int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
{
    va_list va;
    int ret;

    va_start(va, format);
    ret = gzvprintf(file, format, va);
    va_end(va);
    return ret;
}

M
Mark Adler 已提交
461
#else /* !STDC && !Z_HAVE_STDARG_H */
M
Mark Adler 已提交
462 463 464 465 466 467 468 469 470

/* -- see zlib.h -- */
int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
                       a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
    gzFile file;
    const char *format;
    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
        a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
{
471 472
    unsigned len, left;
    char *next;
M
Mark Adler 已提交
473 474 475 476 477
    gz_statep state;
    z_streamp strm;

    /* get internal structure */
    if (file == NULL)
M
Mark Adler 已提交
478
        return Z_STREAM_ERROR;
M
Mark Adler 已提交
479 480 481
    state = (gz_statep)file;
    strm = &(state->strm);

M
Mark Adler 已提交
482 483
    /* check that can really pass pointer in ints */
    if (sizeof(int) != sizeof(void *))
M
Mark Adler 已提交
484
        return Z_STREAM_ERROR;
M
Mark Adler 已提交
485

M
Mark Adler 已提交
486 487
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
M
Mark Adler 已提交
488
        return Z_STREAM_ERROR;
M
Mark Adler 已提交
489 490 491

    /* make sure we have some buffer space */
    if (state->size == 0 && gz_init(state) == -1)
M
Mark Adler 已提交
492
        return state->error;
M
Mark Adler 已提交
493 494 495 496 497

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
M
Mark Adler 已提交
498
            return state->error;
M
Mark Adler 已提交
499 500
    }

501 502 503 504 505 506 507
    /* do the printf() into the input buffer, put length in len -- the input
       buffer is double-sized just for this function, so there is guaranteed to
       be state->size bytes available after the current contents */
    if (strm->avail_in == 0)
        strm->next_in = state->in;
    next = (char *)(strm->next_in + strm->avail_in);
    next[state->size - 1] = 0;
M
Mark Adler 已提交
508 509
#ifdef NO_snprintf
#  ifdef HAS_sprintf_void
510 511
    sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
            a13, a14, a15, a16, a17, a18, a19, a20);
M
Mark Adler 已提交
512
    for (len = 0; len < size; len++)
513 514
        if (next[len] == 0)
            break;
M
Mark Adler 已提交
515
#  else
516 517
    len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
                  a12, a13, a14, a15, a16, a17, a18, a19, a20);
M
Mark Adler 已提交
518 519 520
#  endif
#else
#  ifdef HAS_snprintf_void
521 522 523
    snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
             a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
    len = strlen(next);
M
Mark Adler 已提交
524
#  else
525 526
    len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
                   a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
M
Mark Adler 已提交
527 528 529 530
#  endif
#endif

    /* check that printf() results fit in buffer */
531
    if (len == 0 || len >= state->size || next[state->size - 1] != 0)
M
Mark Adler 已提交
532 533
        return 0;

534 535
    /* update buffer and position, compress first half if past that */
    strm->avail_in += len;
536
    state->x.pos += len;
537 538 539 540
    if (strm->avail_in >= state->size) {
        left = strm->avail_in - state->size;
        strm->avail_in = state->size;
        if (gz_comp(state, Z_NO_FLUSH) == -1)
M
Mark Adler 已提交
541
            return state->err;
542 543 544 545 546
        memcpy(state->in, state->in + state->size, left);
        strm->next_in = state->in;
        strm->avail_in = left;
    }
    return (int)len;
M
Mark Adler 已提交
547 548 549 550 551 552 553 554 555 556 557 558 559
}

#endif

/* -- see zlib.h -- */
int ZEXPORT gzflush(file, flush)
    gzFile file;
    int flush;
{
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
M
Mark Adler 已提交
560
        return Z_STREAM_ERROR;
M
Mark Adler 已提交
561 562 563
    state = (gz_statep)file;

    /* check that we're writing and that there's no error */
M
Mark Adler 已提交
564 565
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return Z_STREAM_ERROR;
M
Mark Adler 已提交
566 567 568 569 570 571 572 573 574

    /* check flush parameter */
    if (flush < 0 || flush > Z_FINISH)
        return Z_STREAM_ERROR;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
M
Mark Adler 已提交
575
            return state->err;
M
Mark Adler 已提交
576 577 578
    }

    /* compress remaining data with requested flush */
579
    (void)gz_comp(state, flush);
M
Mark Adler 已提交
580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609
    return state->err;
}

/* -- see zlib.h -- */
int ZEXPORT gzsetparams(file, level, strategy)
    gzFile file;
    int level;
    int strategy;
{
    gz_statep state;
    z_streamp strm;

    /* get internal structure */
    if (file == NULL)
        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    strm = &(state->strm);

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return Z_STREAM_ERROR;

    /* if no change is requested, then do nothing */
    if (level == state->level && strategy == state->strategy)
        return Z_OK;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
M
Mark Adler 已提交
610
            return state->err;
M
Mark Adler 已提交
611 612 613 614 615
    }

    /* change compression parameters for subsequent input */
    if (state->size) {
        /* flush previous input with previous parameters before changing */
616
        if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
M
Mark Adler 已提交
617 618 619 620 621 622 623 624 625 626 627 628
            return state->err;
        deflateParams(strm, level, strategy);
    }
    state->level = level;
    state->strategy = strategy;
    return Z_OK;
}

/* -- see zlib.h -- */
int ZEXPORT gzclose_w(file)
    gzFile file;
{
629
    int ret = Z_OK;
M
Mark Adler 已提交
630 631 632 633 634 635 636 637 638 639 640 641 642 643
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return Z_STREAM_ERROR;
    state = (gz_statep)file;

    /* check that we're writing */
    if (state->mode != GZ_WRITE)
        return Z_STREAM_ERROR;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
644 645
        if (gz_zero(state, state->skip) == -1)
            ret = state->err;
M
Mark Adler 已提交
646 647 648
    }

    /* flush, free memory, and close file */
649 650
    if (gz_comp(state, Z_FINISH) == -1)
        ret = state->err;
651 652 653 654 655
    if (state->size) {
        if (!state->direct) {
            (void)deflateEnd(&(state->strm));
            free(state->out);
        }
656
        free(state->in);
657
    }
M
Mark Adler 已提交
658
    gz_error(state, Z_OK, NULL);
M
Mark Adler 已提交
659
    free(state->path);
660 661
    if (close(state->fd) == -1)
        ret = Z_ERRNO;
M
Mark Adler 已提交
662
    free(state);
663
    return ret;
M
Mark Adler 已提交
664
}