ReactOS  0.4.14-dev-293-g2b39b42
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 }
GLdouble n
Definition: glext.h:7729
#define Z_BUF_ERROR
Definition: zlib.h:184
z_stream FAR * z_streamp
Definition: zlib.h:108
#define Z_OK
Definition: zlib.h:177
z_streamp strm
Definition: deflate.h:101
GLdouble GLdouble GLdouble GLdouble q
Definition: gl.h:2063
int gz_load(gz_statep state, unsigned char *buf, unsigned len, unsigned *have)
Definition: gzread.c:21
static int state
Definition: maze.c:121
GLfloat GLfloat p
Definition: glext.h:8902

Referenced by gz_decomp(), and gz_look().

◆ gz_decomp()

int gz_decomp ( gz_statep  state)

Definition at line 175 of file gzread.c.

177 {
178  int ret = Z_OK;
179  unsigned had;
180  z_streamp strm = &(state->strm);
181 
182  /* fill output buffer up to end of deflate stream */
183  had = strm->avail_out;
184  do {
185  /* get more input for inflate() */
186  if (strm->avail_in == 0 && gz_avail(state) == -1)
187  return -1;
188  if (strm->avail_in == 0) {
189  gz_error(state, Z_BUF_ERROR, "unexpected end of file");
190  break;
191  }
192 
193  /* decompress and handle errors */
195  if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
197  "internal error: inflate stream corrupt");
198  return -1;
199  }
200  if (ret == Z_MEM_ERROR) {
201  gz_error(state, Z_MEM_ERROR, "out of memory");
202  return -1;
203  }
204  if (ret == Z_DATA_ERROR) { /* deflate stream invalid */
206  strm->msg == NULL ? "compressed data error" : strm->msg);
207  return -1;
208  }
209  } while (strm->avail_out && ret != Z_STREAM_END);
210 
211  /* update available output */
212  state->x.have = had - strm->avail_out;
213  state->x.next = strm->next_out - state->x.have;
214 
215  /* if the gzip stream completed successfully, look for another */
216  if (ret == Z_STREAM_END)
217  state->how = LOOK;
218 
219  /* good decompression */
220  return 0;
221 }
int gz_avail(gz_statep state)
Definition: gzread.c:56
#define Z_NEED_DICT
Definition: zlib.h:179
#define Z_STREAM_ERROR
Definition: zlib.h:181
#define Z_STREAM_END
Definition: zlib.h:178
#define Z_BUF_ERROR
Definition: zlib.h:184
z_stream FAR * z_streamp
Definition: zlib.h:108
#define Z_OK
Definition: zlib.h:177
smooth NULL
Definition: ftsmooth.c:416
z_streamp strm
Definition: deflate.h:101
void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg)
Definition: gzlib.c:579
#define Z_DATA_ERROR
Definition: zlib.h:182
#define Z_NO_FLUSH
Definition: zlib.h:168
int ZEXPORT inflate(z_streamp strm, int flush)
Definition: inflate.c:622
int ret
static int state
Definition: maze.c:121
#define LOOK
Definition: gzguts.h:165
#define Z_MEM_ERROR
Definition: zlib.h:183

Referenced by gz_fetch(), and gz_read().

◆ gz_fetch()

int gz_fetch ( gz_statep  state)

Definition at line 229 of file gzread.c.

231 {
232  z_streamp strm = &(state->strm);
233 
234  do {
235  switch(state->how) {
236  case LOOK: /* -> LOOK, COPY (only if never GZIP), or GZIP */
237  if (gz_look(state) == -1)
238  return -1;
239  if (state->how == LOOK)
240  return 0;
241  break;
242  case COPY: /* -> COPY */
243  if (gz_load(state, state->out, state->size << 1, &(state->x.have))
244  == -1)
245  return -1;
246  state->x.next = state->out;
247  return 0;
248  case GZIP: /* -> GZIP or LOOK (if end of gzip stream) */
249  strm->avail_out = state->size << 1;
250  strm->next_out = state->out;
251  if (gz_decomp(state) == -1)
252  return -1;
253  }
254  } while (state->x.have == 0 && (!state->eof || strm->avail_in));
255  return 0;
256 }
#define COPY(len)
Definition: rtl.c:274
z_stream FAR * z_streamp
Definition: zlib.h:108
int gz_decomp(gz_statep state)
Definition: gzread.c:175
z_streamp strm
Definition: deflate.h:101
int gz_look(gz_statep state)
Definition: gzread.c:91
int gz_load(gz_statep state, unsigned char *buf, unsigned len, unsigned *have)
Definition: gzread.c:21
static int state
Definition: maze.c:121
#define LOOK
Definition: gzguts.h:165
#define GZIP
Definition: deflate.h:23

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 max(a, b)
Definition: svc.c:63
#define Z_ERRNO
Definition: zlib.h:180
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg)
Definition: gzlib.c:579
void get(int argc, const char *argv[])
Definition: cmds.c:480
int ret
static int state
Definition: maze.c:121
GLenum GLsizei len
Definition: glext.h:6722
_CRTIMP int __cdecl read(_In_ int _FileHandle, _Out_writes_bytes_(_MaxCharCount) void *_DstBuf, _In_ unsigned int _MaxCharCount)
#define zstrerror(errnum)
Definition: zutil.h:152

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) {
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  if (strm->avail_in) {
161  memcpy(state->x.next, strm->next_in, strm->avail_in);
162  state->x.have = strm->avail_in;
163  strm->avail_in = 0;
164  }
165  state->how = COPY;
166  state->direct = 1;
167  return 0;
168 }
#define COPY(len)
Definition: rtl.c:274
int gz_avail(gz_statep state)
Definition: gzread.c:56
#define free
Definition: debug_ros.c:5
z_stream FAR * z_streamp
Definition: zlib.h:108
#define Z_OK
Definition: zlib.h:177
smooth NULL
Definition: ftsmooth.c:416
z_streamp strm
Definition: deflate.h:101
void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg)
Definition: gzlib.c:579
#define inflateInit2(strm, windowBits)
Definition: zlib.h:1800
static int state
Definition: maze.c:121
int ZEXPORT inflateReset(z_streamp strm)
Definition: inflate.c:144
#define memcpy(s1, s2, n)
Definition: mkisofs.h:878
#define malloc
Definition: debug_ros.c:4
#define Z_NULL
Definition: zlib.h:212
#define Z_MEM_ERROR
Definition: zlib.h:183
#define GZIP
Definition: deflate.h:23

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 294 of file gzread.c.

298 {
299  z_size_t got;
300  unsigned n;
301 
302  /* if len is zero, avoid unnecessary operations */
303  if (len == 0)
304  return 0;
305 
306  /* process a skip request */
307  if (state->seek) {
308  state->seek = 0;
309  if (gz_skip(state, state->skip) == -1)
310  return 0;
311  }
312 
313  /* get len bytes to buf, or less than len if at the end */
314  got = 0;
315  do {
316  /* set n to the maximum amount of len that fits in an unsigned int */
317  n = -1;
318  if (n > len)
319  n = len;
320 
321  /* first just try copying data from the output buffer */
322  if (state->x.have) {
323  if (state->x.have < n)
324  n = state->x.have;
325  memcpy(buf, state->x.next, n);
326  state->x.next += n;
327  state->x.have -= n;
328  }
329 
330  /* output buffer empty -- return if we're at the end of the input */
331  else if (state->eof && state->strm.avail_in == 0) {
332  state->past = 1; /* tried to read past end */
333  break;
334  }
335 
336  /* need output data -- for small len or new stream load up our output
337  buffer */
338  else if (state->how == LOOK || n < (state->size << 1)) {
339  /* get more output, looking for header if required */
340  if (gz_fetch(state) == -1)
341  return 0;
342  continue; /* no progress yet -- go back to copy above */
343  /* the copy above assures that we will leave with space in the
344  output buffer, allowing at least one gzungetc() to succeed */
345  }
346 
347  /* large len -- read directly into user buffer */
348  else if (state->how == COPY) { /* read directly */
349  if (gz_load(state, (unsigned char *)buf, n, &n) == -1)
350  return 0;
351  }
352 
353  /* large len -- decompress directly into user buffer */
354  else { /* state->how == GZIP */
355  state->strm.avail_out = n;
356  state->strm.next_out = (unsigned char *)buf;
357  if (gz_decomp(state) == -1)
358  return 0;
359  n = state->x.have;
360  state->x.have = 0;
361  }
362 
363  /* update progress */
364  len -= n;
365  buf = (char *)buf + n;
366  got += n;
367  state->x.pos += n;
368  } while (len);
369 
370  /* return number of bytes read into user buffer */
371  return got;
372 }
unsigned long z_size_t
Definition: zconf.h:250
#define COPY(len)
Definition: rtl.c:274
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
GLdouble n
Definition: glext.h:7729
int gz_fetch(gz_statep state)
Definition: gzread.c:229
int gz_decomp(gz_statep state)
Definition: gzread.c:175
int gz_load(gz_statep state, unsigned char *buf, unsigned len, unsigned *have)
Definition: gzread.c:21
static int state
Definition: maze.c:121
#define memcpy(s1, s2, n)
Definition: mkisofs.h:878
GLenum GLsizei len
Definition: glext.h:6722
#define LOOK
Definition: gzguts.h:165
int gz_skip(gz_statep state, z_off64_t len)
Definition: gzread.c:259

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

◆ gz_skip()

int gz_skip ( gz_statep  state,
z_off64_t  len 
)

Definition at line 259 of file gzread.c.

262 {
263  unsigned n;
264 
265  /* skip over len bytes or reach end-of-file, whichever comes first */
266  while (len)
267  /* skip over whatever is in output buffer */
268  if (state->x.have) {
269  n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > len ?
270  (unsigned)len : state->x.have;
271  state->x.have -= n;
272  state->x.next += n;
273  state->x.pos += n;
274  len -= n;
275  }
276 
277  /* output buffer empty -- return if we're at the end of the input */
278  else if (state->eof && state->strm.avail_in == 0)
279  break;
280 
281  /* need more data to skip -- load up output buffer */
282  else {
283  /* get more output, looking for header if required */
284  if (gz_fetch(state) == -1)
285  return -1;
286  }
287  return 0;
288 }
#define GT_OFF(x)
Definition: gzguts.h:217
GLdouble n
Definition: glext.h:7729
#define z_off64_t
Definition: zconf.h:513
int gz_fetch(gz_statep state)
Definition: gzread.c:229
static int state
Definition: maze.c:121
GLenum GLsizei len
Definition: glext.h:6722

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

◆ gzclose_r()

int ZEXPORT gzclose_r ( gzFile  file)

Definition at line 627 of file gzread.c.

629 {
630  int ret, err;
632 
633  /* get internal structure */
634  if (file == NULL)
635  return Z_STREAM_ERROR;
636  state = (gz_statep)file;
637 
638  /* check that we're reading */
639  if (state->mode != GZ_READ)
640  return Z_STREAM_ERROR;
641 
642  /* free memory and close file */
643  if (state->size) {
644  inflateEnd(&(state->strm));
645  free(state->out);
646  free(state->in);
647  }
648  err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK;
649  gz_error(state, Z_OK, NULL);
650  free(state->path);
651  ret = close(state->fd);
652  free(state);
653  return ret ? Z_ERRNO : err;
654 }
#define Z_ERRNO
Definition: zlib.h:180
#define free
Definition: debug_ros.c:5
int ZEXPORT inflateEnd(z_streamp strm)
Definition: inflate.c:1277
#define GZ_READ
Definition: gzguts.h:160
#define Z_STREAM_ERROR
Definition: zlib.h:181
#define Z_BUF_ERROR
Definition: zlib.h:184
#define Z_OK
Definition: zlib.h:177
smooth NULL
Definition: ftsmooth.c:416
void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg)
Definition: gzlib.c:579
int ret
static int state
Definition: maze.c:121
#define close
Definition: acwin.h:98
#define err(...)
gz_state FAR * gz_statep
Definition: gzguts.h:202
Definition: fci.c:126

Referenced by gzclose().

◆ gzdirect()

int ZEXPORT gzdirect ( gzFile  file)

Definition at line 607 of file gzread.c.

609 {
611 
612  /* get internal structure */
613  if (file == NULL)
614  return 0;
615  state = (gz_statep)file;
616 
617  /* if the state is not known, but we can find out, then do so (this is
618  mainly for right after a gzopen() or gzdopen()) */
619  if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
620  (void)gz_look(state);
621 
622  /* return 1 if transparent, 0 if processing a gzip stream */
623  return state->direct;
624 }
struct png_info_def **typedef void(__cdecl typeof(png_destroy_read_struct))(struct png_struct_def **
Definition: typeof.h:49
#define GZ_READ
Definition: gzguts.h:160
smooth NULL
Definition: ftsmooth.c:416
int gz_look(gz_statep state)
Definition: gzread.c:91
static int state
Definition: maze.c:121
#define LOOK
Definition: gzguts.h:165
gz_state FAR * gz_statep
Definition: gzguts.h:202
Definition: fci.c:126

◆ gzfread()

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

Definition at line 411 of file gzread.c.

416 {
417  z_size_t len;
419 
420  /* get internal structure */
421  if (file == NULL)
422  return 0;
423  state = (gz_statep)file;
424 
425  /* check that we're reading and that there's no (serious) error */
426  if (state->mode != GZ_READ ||
427  (state->err != Z_OK && state->err != Z_BUF_ERROR))
428  return 0;
429 
430  /* compute bytes to read -- error on overflow */
431  len = nitems * size;
432  if (size && len / size != nitems) {
433  gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
434  return 0;
435  }
436 
437  /* read len or fewer bytes to buf, return the number of full items read */
438  return len ? gz_read(state, buf, len) / size : 0;
439 }
unsigned long z_size_t
Definition: zconf.h:250
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
#define GZ_READ
Definition: gzguts.h:160
z_size_t gz_read(gz_statep state, voidp buf, z_size_t len)
Definition: gzread.c:294
#define Z_STREAM_ERROR
Definition: zlib.h:181
#define Z_BUF_ERROR
Definition: zlib.h:184
#define Z_OK
Definition: zlib.h:177
smooth NULL
Definition: ftsmooth.c:416
void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg)
Definition: gzlib.c:579
GLsizeiptr size
Definition: glext.h:5919
static int state
Definition: maze.c:121
GLenum GLsizei len
Definition: glext.h:6722
gz_state FAR * gz_statep
Definition: gzguts.h:202
Definition: fci.c:126

◆ gzgetc()

int ZEXPORT gzgetc ( gzFile  file)

Definition at line 447 of file gzread.c.

449 {
450  int ret;
451  unsigned char buf[1];
453 
454  /* get internal structure */
455  if (file == NULL)
456  return -1;
457  state = (gz_statep)file;
458 
459  /* check that we're reading and that there's no (serious) error */
460  if (state->mode != GZ_READ ||
461  (state->err != Z_OK && state->err != Z_BUF_ERROR))
462  return -1;
463 
464  /* try output buffer (no need to check for skip request) */
465  if (state->x.have) {
466  state->x.have--;
467  state->x.pos++;
468  return *(state->x.next)++;
469  }
470 
471  /* nothing there -- try gz_read() */
472  ret = gz_read(state, buf, 1);
473  return ret < 1 ? -1 : buf[0];
474 }
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
#define GZ_READ
Definition: gzguts.h:160
z_size_t gz_read(gz_statep state, voidp buf, z_size_t len)
Definition: gzread.c:294
#define Z_BUF_ERROR
Definition: zlib.h:184
#define Z_OK
Definition: zlib.h:177
smooth NULL
Definition: ftsmooth.c:416
int ret
static int state
Definition: maze.c:121
gz_state FAR * gz_statep
Definition: gzguts.h:202
Definition: fci.c:126

Referenced by gzgetc_().

◆ gzgetc_()

int ZEXPORT gzgetc_ ( gzFile  file)

Definition at line 476 of file gzread.c.

478 {
479  return gzgetc(file);
480 }
int ZEXPORT gzgetc(gzFile file)
Definition: gzread.c:447
Definition: fci.c:126

◆ gzgets()

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

Definition at line 543 of file gzread.c.

547 {
548  unsigned left, n;
549  char *str;
550  unsigned char *eol;
552 
553  /* check parameters and get internal structure */
554  if (file == NULL || buf == NULL || len < 1)
555  return NULL;
556  state = (gz_statep)file;
557 
558  /* check that we're reading and that there's no (serious) error */
559  if (state->mode != GZ_READ ||
560  (state->err != Z_OK && state->err != Z_BUF_ERROR))
561  return NULL;
562 
563  /* process a skip request */
564  if (state->seek) {
565  state->seek = 0;
566  if (gz_skip(state, state->skip) == -1)
567  return NULL;
568  }
569 
570  /* copy output bytes up to new line or len - 1, whichever comes first --
571  append a terminating zero to the string (we don't check for a zero in
572  the contents, let the user worry about that) */
573  str = buf;
574  left = (unsigned)len - 1;
575  if (left) do {
576  /* assure that something is in the output buffer */
577  if (state->x.have == 0 && gz_fetch(state) == -1)
578  return NULL; /* error */
579  if (state->x.have == 0) { /* end of file */
580  state->past = 1; /* read past end */
581  break; /* return what we have */
582  }
583 
584  /* look for end-of-line in current output buffer */
585  n = state->x.have > left ? left : state->x.have;
586  eol = (unsigned char *)memchr(state->x.next, '\n', n);
587  if (eol != NULL)
588  n = (unsigned)(eol - state->x.next) + 1;
589 
590  /* copy through end-of-line, or remainder if not found */
591  memcpy(buf, state->x.next, n);
592  state->x.have -= n;
593  state->x.next += n;
594  state->x.pos += n;
595  left -= n;
596  buf += n;
597  } while (left && eol == NULL);
598 
599  /* return terminated string, or if nothing, end of file */
600  if (buf == str)
601  return NULL;
602  buf[0] = 0;
603  return str;
604 }
#define memchr(s, c, n)
Definition: mkisofs.h:875
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
GLdouble n
Definition: glext.h:7729
#define GZ_READ
Definition: gzguts.h:160
#define Z_BUF_ERROR
Definition: zlib.h:184
#define Z_OK
Definition: zlib.h:177
int gz_fetch(gz_statep state)
Definition: gzread.c:229
const WCHAR * str
smooth NULL
Definition: ftsmooth.c:416
GLint left
Definition: glext.h:7726
static int state
Definition: maze.c:121
#define memcpy(s1, s2, n)
Definition: mkisofs.h:878
GLenum GLsizei len
Definition: glext.h:6722
int gz_skip(gz_statep state, z_off64_t len)
Definition: gzread.c:259
gz_state FAR * gz_statep
Definition: gzguts.h:202
Definition: fci.c:126

◆ gzread()

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

Definition at line 375 of file gzread.c.

379 {
381 
382  /* get internal structure */
383  if (file == NULL)
384  return -1;
385  state = (gz_statep)file;
386 
387  /* check that we're reading and that there's no (serious) error */
388  if (state->mode != GZ_READ ||
389  (state->err != Z_OK && state->err != Z_BUF_ERROR))
390  return -1;
391 
392  /* since an int is returned, make sure len fits in one, otherwise return
393  with an error (this avoids a flaw in the interface) */
394  if ((int)len < 0) {
395  gz_error(state, Z_STREAM_ERROR, "request does not fit in an int");
396  return -1;
397  }
398 
399  /* read len or fewer bytes to buf */
400  len = gz_read(state, buf, len);
401 
402  /* check for an error */
403  if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR)
404  return -1;
405 
406  /* return the number of bytes read (this is assured to fit in an int) */
407  return (int)len;
408 }
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
#define GZ_READ
Definition: gzguts.h:160
z_size_t gz_read(gz_statep state, voidp buf, z_size_t len)
Definition: gzread.c:294
#define Z_STREAM_ERROR
Definition: zlib.h:181
#define Z_BUF_ERROR
Definition: zlib.h:184
#define Z_OK
Definition: zlib.h:177
smooth NULL
Definition: ftsmooth.c:416
void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg)
Definition: gzlib.c:579
static int state
Definition: maze.c:121
GLenum GLsizei len
Definition: glext.h:6722
gz_state FAR * gz_statep
Definition: gzguts.h:202
Definition: fci.c:126

◆ gzungetc()

int ZEXPORT gzungetc ( int  c,
gzFile  file 
)

Definition at line 483 of file gzread.c.

486 {
488 
489  /* get internal structure */
490  if (file == NULL)
491  return -1;
492  state = (gz_statep)file;
493 
494  /* check that we're reading and that there's no (serious) error */
495  if (state->mode != GZ_READ ||
496  (state->err != Z_OK && state->err != Z_BUF_ERROR))
497  return -1;
498 
499  /* process a skip request */
500  if (state->seek) {
501  state->seek = 0;
502  if (gz_skip(state, state->skip) == -1)
503  return -1;
504  }
505 
506  /* can't push EOF */
507  if (c < 0)
508  return -1;
509 
510  /* if output buffer empty, put byte at end (allows more pushing) */
511  if (state->x.have == 0) {
512  state->x.have = 1;
513  state->x.next = state->out + (state->size << 1) - 1;
514  state->x.next[0] = (unsigned char)c;
515  state->x.pos--;
516  state->past = 0;
517  return c;
518  }
519 
520  /* if no room, give up (must have already done a gzungetc()) */
521  if (state->x.have == (state->size << 1)) {
522  gz_error(state, Z_DATA_ERROR, "out of room to push characters");
523  return -1;
524  }
525 
526  /* slide output data if needed and insert byte before existing data */
527  if (state->x.next == state->out) {
528  unsigned char *src = state->out + state->x.have;
529  unsigned char *dest = state->out + (state->size << 1);
530  while (src > state->out)
531  *--dest = *--src;
532  state->x.next = dest;
533  }
534  state->x.have++;
535  state->x.next--;
536  state->x.next[0] = (unsigned char)c;
537  state->x.pos--;
538  state->past = 0;
539  return c;
540 }
#define GZ_READ
Definition: gzguts.h:160
#define Z_BUF_ERROR
Definition: zlib.h:184
#define Z_OK
Definition: zlib.h:177
smooth NULL
Definition: ftsmooth.c:416
unsigned char
Definition: typeof.h:29
void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg)
Definition: gzlib.c:579
const GLubyte * c
Definition: glext.h:8905
#define Z_DATA_ERROR
Definition: zlib.h:182
static int state
Definition: maze.c:121
GLenum src
Definition: glext.h:6340
int gz_skip(gz_statep state, z_off64_t len)
Definition: gzread.c:259
gz_state FAR * gz_statep
Definition: gzguts.h:202
#define c
Definition: ke_i.h:80
static char * dest
Definition: rtl.c:135
Definition: fci.c:126

◆ OF() [1/4]

int gz_load OF ( (gz_statep, unsigned char *, unsigned, unsigned *)  )

◆ OF() [2/4]

int gz_avail OF ( (gz_statep )

◆ OF() [3/4]

◆ OF() [4/4]