ReactOS 0.4.15-dev-8102-g108db8f
gzread.c File Reference
#include "gzguts.h"
Include dependency graph for gzread.c:

Go to the source code of this file.

Functions

int gz_load OF ((gz_statep, unsigned char *, unsigned, unsigned *))
 
int gz_avail OF ((gz_statep))
 
int gz_skip OF ((gz_statep, z_off64_t))
 
z_size_t gz_read OF ((gz_statep, voidp, z_size_t))
 
int gz_load (gz_statep state, unsigned char *buf, unsigned len, unsigned *have)
 
int gz_avail (gz_statep state)
 
int gz_look (gz_statep state)
 
int gz_decomp (gz_statep state)
 
int gz_fetch (gz_statep state)
 
int gz_skip (gz_statep state, z_off64_t len)
 
z_size_t gz_read (gz_statep state, voidp buf, z_size_t len)
 
int ZEXPORT gzread (gzFile file, voidp buf, unsigned len)
 
z_size_t ZEXPORT gzfread (voidp buf, z_size_t size, z_size_t nitems, gzFile file)
 
int ZEXPORT gzgetc (gzFile file)
 
int ZEXPORT gzgetc_ (gzFile file)
 
int ZEXPORT gzungetc (int c, gzFile file)
 
char *ZEXPORT gzgets (gzFile file, char *buf, int len)
 
int ZEXPORT gzdirect (gzFile file)
 
int ZEXPORT gzclose_r (gzFile file)
 

Function Documentation

◆ gz_avail()

int gz_avail ( gz_statep  state)

Definition at line 56 of file gzread.c.

58{
59 unsigned got;
60 z_streamp strm = &(state->strm);
61
62 if (state->err != Z_OK && state->err != Z_BUF_ERROR)
63 return -1;
64 if (state->eof == 0) {
65 if (strm->avail_in) { /* copy what's there to the start */
66 unsigned char *p = state->in;
67 unsigned const char *q = strm->next_in;
68 unsigned n = strm->avail_in;
69 do {
70 *p++ = *q++;
71 } while (--n);
72 }
73 if (gz_load(state, state->in + strm->avail_in,
74 state->size - strm->avail_in, &got) == -1)
75 return -1;
76 strm->avail_in += got;
77 strm->next_in = state->in;
78 }
79 return 0;
80}
static int state
Definition: maze.c:121
#define Z_BUF_ERROR
Definition: zlib.h:121
z_stream FAR * z_streamp
Definition: zlib.h:80
#define Z_OK
Definition: zlib.h:114
GLdouble GLdouble GLdouble GLdouble q
Definition: gl.h:2063
GLdouble n
Definition: glext.h:7729
GLfloat GLfloat p
Definition: glext.h:8902
int gz_load(gz_statep state, unsigned char *buf, unsigned len, unsigned *have)
Definition: gzread.c:21

Referenced by gz_decomp(), and gz_look().

◆ gz_decomp()

int gz_decomp ( gz_statep  state)

Definition at line 173 of file gzread.c.

175{
176 int ret = Z_OK;
177 unsigned had;
178 z_streamp strm = &(state->strm);
179
180 /* fill output buffer up to end of deflate stream */
181 had = strm->avail_out;
182 do {
183 /* get more input for inflate() */
184 if (strm->avail_in == 0 && gz_avail(state) == -1)
185 return -1;
186 if (strm->avail_in == 0) {
187 gz_error(state, Z_BUF_ERROR, "unexpected end of file");
188 break;
189 }
190
191 /* decompress and handle errors */
192 ret = inflate(strm, Z_NO_FLUSH);
193 if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
195 "internal error: inflate stream corrupt");
196 return -1;
197 }
198 if (ret == Z_MEM_ERROR) {
199 gz_error(state, Z_MEM_ERROR, "out of memory");
200 return -1;
201 }
202 if (ret == Z_DATA_ERROR) { /* deflate stream invalid */
204 strm->msg == NULL ? "compressed data error" : strm->msg);
205 return -1;
206 }
207 } while (strm->avail_out && ret != Z_STREAM_END);
208
209 /* update available output */
210 state->x.have = had - strm->avail_out;
211 state->x.next = strm->next_out - state->x.have;
212
213 /* if the gzip stream completed successfully, look for another */
214 if (ret == Z_STREAM_END)
215 state->how = LOOK;
216
217 /* good decompression */
218 return 0;
219}
#define NULL
Definition: types.h:112
int inflate(z_streamp strm, int flush)
Definition: inflate.c:1257
#define Z_NEED_DICT
Definition: zlib.h:116
#define Z_STREAM_END
Definition: zlib.h:115
#define Z_DATA_ERROR
Definition: zlib.h:119
#define Z_STREAM_ERROR
Definition: zlib.h:118
#define Z_NO_FLUSH
Definition: zlib.h:105
#define Z_MEM_ERROR
Definition: zlib.h:120
#define LOOK
Definition: gzguts.h:165
void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg)
Definition: gzlib.c:581
int gz_avail(gz_statep state)
Definition: gzread.c:56
int ret

Referenced by gz_fetch(), and gz_read().

◆ gz_fetch()

int gz_fetch ( gz_statep  state)

Definition at line 227 of file gzread.c.

229{
230 z_streamp strm = &(state->strm);
231
232 do {
233 switch(state->how) {
234 case LOOK: /* -> LOOK, COPY (only if never GZIP), or GZIP */
235 if (gz_look(state) == -1)
236 return -1;
237 if (state->how == LOOK)
238 return 0;
239 break;
240 case COPY: /* -> COPY */
241 if (gz_load(state, state->out, state->size << 1, &(state->x.have))
242 == -1)
243 return -1;
244 state->x.next = state->out;
245 return 0;
246 case GZIP: /* -> GZIP or LOOK (if end of gzip stream) */
247 strm->avail_out = state->size << 1;
248 strm->next_out = state->out;
249 if (gz_decomp(state) == -1)
250 return -1;
251 }
252 } while (state->x.have == 0 && (!state->eof || strm->avail_in));
253 return 0;
254}
#define GZIP
Definition: deflate.h:23
int gz_decomp(gz_statep state)
Definition: gzread.c:173
int gz_look(gz_statep state)
Definition: gzread.c:91
#define COPY(len)
Definition: rtl.c:274

Referenced by gz_read(), gz_skip(), and gzgets().

◆ gz_load()

int gz_load ( gz_statep  state,
unsigned char buf,
unsigned  len,
unsigned have 
)

Definition at line 21 of file gzread.c.

26{
27 int ret;
28 unsigned get, max = ((unsigned)-1 >> 2) + 1;
29
30 *have = 0;
31 do {
32 get = len - *have;
33 if (get > max)
34 get = max;
35 ret = read(state->fd, buf + *have, get);
36 if (ret <= 0)
37 break;
38 *have += (unsigned)ret;
39 } while (*have < len);
40 if (ret < 0) {
42 return -1;
43 }
44 if (ret == 0)
45 state->eof = 1;
46 return 0;
47}
#define read
Definition: acwin.h:96
void get(int argc, const char *argv[])
Definition: cmds.c:480
#define Z_ERRNO
Definition: zlib.h:117
#define zstrerror(errnum)
Definition: zutil.h:152
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
GLenum GLsizei len
Definition: glext.h:6722
static unsigned(__cdecl *hash_bstr)(bstr_t s)
#define max(a, b)
Definition: svc.c:63

Referenced by gz_avail(), gz_fetch(), and gz_read().

◆ gz_look()

int gz_look ( gz_statep  state)

Definition at line 91 of file gzread.c.

93{
94 z_streamp strm = &(state->strm);
95
96 /* allocate read buffers and inflate memory */
97 if (state->size == 0) {
98 /* allocate buffers */
99 state->in = (unsigned char *)malloc(state->want);
100 state->out = (unsigned char *)malloc(state->want << 1);
101 if (state->in == NULL || state->out == NULL) {
102 free(state->out);
103 free(state->in);
104 gz_error(state, Z_MEM_ERROR, "out of memory");
105 return -1;
106 }
107 state->size = state->want;
108
109 /* allocate inflate memory */
110 state->strm.zalloc = Z_NULL;
111 state->strm.zfree = Z_NULL;
112 state->strm.opaque = Z_NULL;
113 state->strm.avail_in = 0;
114 state->strm.next_in = Z_NULL;
115 if (inflateInit2(&(state->strm), 15 + 16) != Z_OK) { /* gunzip */
116 free(state->out);
117 free(state->in);
118 state->size = 0;
119 gz_error(state, Z_MEM_ERROR, "out of memory");
120 return -1;
121 }
122 }
123
124 /* get at least the magic bytes in the input buffer */
125 if (strm->avail_in < 2) {
126 if (gz_avail(state) == -1)
127 return -1;
128 if (strm->avail_in == 0)
129 return 0;
130 }
131
132 /* look for gzip magic bytes -- if there, do gzip decoding (note: there is
133 a logical dilemma here when considering the case of a partially written
134 gzip file, to wit, if a single 31 byte is written, then we cannot tell
135 whether this is a single-byte file, or just a partially written gzip
136 file -- for here we assume that if a gzip file is being written, then
137 the header will be written in a single operation, so that reading a
138 single byte is sufficient indication that it is not a gzip file) */
139 if (strm->avail_in > 1 &&
140 strm->next_in[0] == 31 && strm->next_in[1] == 139) {
141 inflateReset(strm);
142 state->how = GZIP;
143 state->direct = 0;
144 return 0;
145 }
146
147 /* no gzip header -- if we were decoding gzip before, then this is trailing
148 garbage. Ignore the trailing garbage and finish. */
149 if (state->direct == 0) {
150 strm->avail_in = 0;
151 state->eof = 1;
152 state->x.have = 0;
153 return 0;
154 }
155
156 /* doing raw i/o, copy any leftover input to output -- this assumes that
157 the output buffer is larger than the input buffer, which also assures
158 space for gzungetc() */
159 state->x.next = state->out;
160 memcpy(state->x.next, strm->next_in, strm->avail_in);
161 state->x.have = strm->avail_in;
162 strm->avail_in = 0;
163 state->how = COPY;
164 state->direct = 1;
165 return 0;
166}
#define free
Definition: debug_ros.c:5
#define malloc
Definition: debug_ros.c:4
static int inflateReset(z_streamp strm)
Definition: inflate.c:839
#define Z_NULL
Definition: zlib.h:149
#define memcpy(s1, s2, n)
Definition: mkisofs.h:878
#define inflateInit2(strm, windowBits)
Definition: zlib.h:1817

Referenced by gz_fetch(), and gzdirect().

◆ gz_read()

z_size_t gz_read ( gz_statep  state,
voidp  buf,
z_size_t  len 
)

Definition at line 292 of file gzread.c.

296{
297 z_size_t got;
298 unsigned n;
299
300 /* if len is zero, avoid unnecessary operations */
301 if (len == 0)
302 return 0;
303
304 /* process a skip request */
305 if (state->seek) {
306 state->seek = 0;
307 if (gz_skip(state, state->skip) == -1)
308 return 0;
309 }
310
311 /* get len bytes to buf, or less than len if at the end */
312 got = 0;
313 do {
314 /* set n to the maximum amount of len that fits in an unsigned int */
315 n = (unsigned)-1;
316 if (n > len)
317 n = (unsigned)len;
318
319 /* first just try copying data from the output buffer */
320 if (state->x.have) {
321 if (state->x.have < n)
322 n = state->x.have;
323 memcpy(buf, state->x.next, n);
324 state->x.next += n;
325 state->x.have -= n;
326 }
327
328 /* output buffer empty -- return if we're at the end of the input */
329 else if (state->eof && state->strm.avail_in == 0) {
330 state->past = 1; /* tried to read past end */
331 break;
332 }
333
334 /* need output data -- for small len or new stream load up our output
335 buffer */
336 else if (state->how == LOOK || n < (state->size << 1)) {
337 /* get more output, looking for header if required */
338 if (gz_fetch(state) == -1)
339 return 0;
340 continue; /* no progress yet -- go back to copy above */
341 /* the copy above assures that we will leave with space in the
342 output buffer, allowing at least one gzungetc() to succeed */
343 }
344
345 /* large len -- read directly into user buffer */
346 else if (state->how == COPY) { /* read directly */
347 if (gz_load(state, (unsigned char *)buf, n, &n) == -1)
348 return 0;
349 }
350
351 /* large len -- decompress directly into user buffer */
352 else { /* state->how == GZIP */
353 state->strm.avail_out = n;
354 state->strm.next_out = (unsigned char *)buf;
355 if (gz_decomp(state) == -1)
356 return 0;
357 n = state->x.have;
358 state->x.have = 0;
359 }
360
361 /* update progress */
362 len -= n;
363 buf = (char *)buf + n;
364 got += n;
365 state->x.pos += n;
366 } while (len);
367
368 /* return number of bytes read into user buffer */
369 return got;
370}
int gz_skip(gz_statep state, z_off64_t len)
Definition: gzread.c:257
int gz_fetch(gz_statep state)
Definition: gzread.c:227
unsigned long z_size_t
Definition: zconf.h:253

Referenced by gzfread(), gzgetc(), and gzread().

◆ gz_skip()

int gz_skip ( gz_statep  state,
z_off64_t  len 
)

Definition at line 257 of file gzread.c.

260{
261 unsigned n;
262
263 /* skip over len bytes or reach end-of-file, whichever comes first */
264 while (len)
265 /* skip over whatever is in output buffer */
266 if (state->x.have) {
267 n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > len ?
268 (unsigned)len : state->x.have;
269 state->x.have -= n;
270 state->x.next += n;
271 state->x.pos += n;
272 len -= n;
273 }
274
275 /* output buffer empty -- return if we're at the end of the input */
276 else if (state->eof && state->strm.avail_in == 0)
277 break;
278
279 /* need more data to skip -- load up output buffer */
280 else {
281 /* get more output, looking for header if required */
282 if (gz_fetch(state) == -1)
283 return -1;
284 }
285 return 0;
286}
#define GT_OFF(x)
Definition: gzguts.h:218
#define z_off64_t
Definition: zconf.h:526

Referenced by gz_read(), gzgets(), and gzungetc().

◆ gzclose_r()

int ZEXPORT gzclose_r ( gzFile  file)

Definition at line 623 of file gzread.c.

625{
626 int ret, err;
628
629 /* get internal structure */
630 if (file == NULL)
631 return Z_STREAM_ERROR;
633
634 /* check that we're reading */
635 if (state->mode != GZ_READ)
636 return Z_STREAM_ERROR;
637
638 /* free memory and close file */
639 if (state->size) {
640 inflateEnd(&(state->strm));
641 free(state->out);
642 free(state->in);
643 }
644 err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK;
646 free(state->path);
647 ret = close(state->fd);
648 free(state);
649 return ret ? Z_ERRNO : err;
650}
#define close
Definition: acwin.h:98
int inflateEnd(z_streamp strm)
Definition: inflate.c:1910
gz_state FAR * gz_statep
Definition: gzguts.h:203
#define GZ_READ
Definition: gzguts.h:160
#define err(...)
Definition: fci.c:127

Referenced by gzclose().

◆ gzdirect()

int ZEXPORT gzdirect ( gzFile  file)

Definition at line 603 of file gzread.c.

605{
607
608 /* get internal structure */
609 if (file == NULL)
610 return 0;
612
613 /* if the state is not known, but we can find out, then do so (this is
614 mainly for right after a gzopen() or gzdopen()) */
615 if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
617
618 /* return 1 if transparent, 0 if processing a gzip stream */
619 return state->direct;
620}

◆ gzfread()

z_size_t ZEXPORT gzfread ( voidp  buf,
z_size_t  size,
z_size_t  nitems,
gzFile  file 
)

Definition at line 409 of file gzread.c.

414{
417
418 /* get internal structure */
419 if (file == NULL)
420 return 0;
422
423 /* check that we're reading and that there's no (serious) error */
424 if (state->mode != GZ_READ ||
425 (state->err != Z_OK && state->err != Z_BUF_ERROR))
426 return 0;
427
428 /* compute bytes to read -- error on overflow */
429 len = nitems * size;
430 if (size && len / size != nitems) {
431 gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
432 return 0;
433 }
434
435 /* read len or fewer bytes to buf, return the number of full items read */
436 return len ? gz_read(state, buf, len) / size : 0;
437}
GLsizeiptr size
Definition: glext.h:5919
z_size_t gz_read(gz_statep state, voidp buf, z_size_t len)
Definition: gzread.c:292

◆ gzgetc()

int ZEXPORT gzgetc ( gzFile  file)

Definition at line 445 of file gzread.c.

447{
448 unsigned char buf[1];
450
451 /* get internal structure */
452 if (file == NULL)
453 return -1;
455
456 /* check that we're reading and that there's no (serious) error */
457 if (state->mode != GZ_READ ||
458 (state->err != Z_OK && state->err != Z_BUF_ERROR))
459 return -1;
460
461 /* try output buffer (no need to check for skip request) */
462 if (state->x.have) {
463 state->x.have--;
464 state->x.pos++;
465 return *(state->x.next)++;
466 }
467
468 /* nothing there -- try gz_read() */
469 return gz_read(state, buf, 1) < 1 ? -1 : buf[0];
470}

◆ gzgetc_()

int ZEXPORT gzgetc_ ( gzFile  file)

Definition at line 472 of file gzread.c.

474{
475 return gzgetc(file);
476}
#define gzgetc(g)
Definition: zlib.h:1845

◆ gzgets()

char *ZEXPORT gzgets ( gzFile  file,
char buf,
int  len 
)

Definition at line 539 of file gzread.c.

543{
544 unsigned left, n;
545 char *str;
546 unsigned char *eol;
548
549 /* check parameters and get internal structure */
550 if (file == NULL || buf == NULL || len < 1)
551 return NULL;
553
554 /* check that we're reading and that there's no (serious) error */
555 if (state->mode != GZ_READ ||
556 (state->err != Z_OK && state->err != Z_BUF_ERROR))
557 return NULL;
558
559 /* process a skip request */
560 if (state->seek) {
561 state->seek = 0;
562 if (gz_skip(state, state->skip) == -1)
563 return NULL;
564 }
565
566 /* copy output bytes up to new line or len - 1, whichever comes first --
567 append a terminating zero to the string (we don't check for a zero in
568 the contents, let the user worry about that) */
569 str = buf;
570 left = (unsigned)len - 1;
571 if (left) do {
572 /* assure that something is in the output buffer */
573 if (state->x.have == 0 && gz_fetch(state) == -1)
574 return NULL; /* error */
575 if (state->x.have == 0) { /* end of file */
576 state->past = 1; /* read past end */
577 break; /* return what we have */
578 }
579
580 /* look for end-of-line in current output buffer */
581 n = state->x.have > left ? left : state->x.have;
582 eol = (unsigned char *)memchr(state->x.next, '\n', n);
583 if (eol != NULL)
584 n = (unsigned)(eol - state->x.next) + 1;
585
586 /* copy through end-of-line, or remainder if not found */
587 memcpy(buf, state->x.next, n);
588 state->x.have -= n;
589 state->x.next += n;
590 state->x.pos += n;
591 left -= n;
592 buf += n;
593 } while (left && eol == NULL);
594
595 /* return terminated string, or if nothing, end of file */
596 if (buf == str)
597 return NULL;
598 buf[0] = 0;
599 return str;
600}
GLint left
Definition: glext.h:7726
#define memchr(s, c, n)
Definition: mkisofs.h:875
const WCHAR * str

◆ gzread()

int ZEXPORT gzread ( gzFile  file,
voidp  buf,
unsigned  len 
)

Definition at line 373 of file gzread.c.

377{
379
380 /* get internal structure */
381 if (file == NULL)
382 return -1;
384
385 /* check that we're reading and that there's no (serious) error */
386 if (state->mode != GZ_READ ||
387 (state->err != Z_OK && state->err != Z_BUF_ERROR))
388 return -1;
389
390 /* since an int is returned, make sure len fits in one, otherwise return
391 with an error (this avoids a flaw in the interface) */
392 if ((int)len < 0) {
393 gz_error(state, Z_STREAM_ERROR, "request does not fit in an int");
394 return -1;
395 }
396
397 /* read len or fewer bytes to buf */
399
400 /* check for an error */
401 if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR)
402 return -1;
403
404 /* return the number of bytes read (this is assured to fit in an int) */
405 return (int)len;
406}

◆ gzungetc()

int ZEXPORT gzungetc ( int  c,
gzFile  file 
)

Definition at line 479 of file gzread.c.

482{
484
485 /* get internal structure */
486 if (file == NULL)
487 return -1;
489
490 /* check that we're reading and that there's no (serious) error */
491 if (state->mode != GZ_READ ||
492 (state->err != Z_OK && state->err != Z_BUF_ERROR))
493 return -1;
494
495 /* process a skip request */
496 if (state->seek) {
497 state->seek = 0;
498 if (gz_skip(state, state->skip) == -1)
499 return -1;
500 }
501
502 /* can't push EOF */
503 if (c < 0)
504 return -1;
505
506 /* if output buffer empty, put byte at end (allows more pushing) */
507 if (state->x.have == 0) {
508 state->x.have = 1;
509 state->x.next = state->out + (state->size << 1) - 1;
510 state->x.next[0] = (unsigned char)c;
511 state->x.pos--;
512 state->past = 0;
513 return c;
514 }
515
516 /* if no room, give up (must have already done a gzungetc()) */
517 if (state->x.have == (state->size << 1)) {
518 gz_error(state, Z_DATA_ERROR, "out of room to push characters");
519 return -1;
520 }
521
522 /* slide output data if needed and insert byte before existing data */
523 if (state->x.next == state->out) {
524 unsigned char *src = state->out + state->x.have;
525 unsigned char *dest = state->out + (state->size << 1);
526 while (src > state->out)
527 *--dest = *--src;
528 state->x.next = dest;
529 }
530 state->x.have++;
531 state->x.next--;
532 state->x.next[0] = (unsigned char)c;
533 state->x.pos--;
534 state->past = 0;
535 return c;
536}
unsigned char
Definition: typeof.h:29
GLenum src
Definition: glext.h:6340
const GLubyte * c
Definition: glext.h:8905
#define c
Definition: ke_i.h:80
static char * dest
Definition: rtl.c:135

◆ OF() [1/4]

int gz_avail OF ( (gz_statep )

◆ OF() [2/4]

◆ OF() [3/4]

◆ OF() [4/4]