| 1 |
/* gzlib.c -- zlib functions common to reading and writing gzip files |
| 2 |
* Copyright (C) 2004, 2010, 2011, 2012, 2013 Mark Adler |
| 3 |
* For conditions of distribution and use, see copyright notice in zlib.h |
| 4 |
*/ |
| 5 |
|
| 6 |
#include "gzguts.h" |
| 7 |
|
| 8 |
#if defined(_WIN32) && !defined(__BORLANDC__) |
| 9 |
# define LSEEK _lseeki64 |
| 10 |
#else |
| 11 |
#if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0 |
| 12 |
# define LSEEK lseek64 |
| 13 |
#else |
| 14 |
# define LSEEK lseek |
| 15 |
#endif |
| 16 |
#endif |
| 17 |
|
| 18 |
/* Local functions */ |
| 19 |
local void gz_reset OF((gz_statep)); |
| 20 |
local gzFile gz_open OF((const void *, int, const char *)); |
| 21 |
|
| 22 |
#if defined UNDER_CE |
| 23 |
|
| 24 |
/* Map the Windows error number in ERROR to a locale-dependent error message |
| 25 |
string and return a pointer to it. Typically, the values for ERROR come |
| 26 |
from GetLastError. |
| 27 |
|
| 28 |
The string pointed to shall not be modified by the application, but may be |
| 29 |
overwritten by a subsequent call to gz_strwinerror |
| 30 |
|
| 31 |
The gz_strwinerror function does not change the current setting of |
| 32 |
GetLastError. */ |
| 33 |
char ZLIB_INTERNAL *gz_strwinerror (error) |
| 34 |
DWORD error; |
| 35 |
{ |
| 36 |
static char buf[1024]; |
| 37 |
|
| 38 |
wchar_t *msgbuf; |
| 39 |
DWORD lasterr = GetLastError(); |
| 40 |
DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
| 41 |
| FORMAT_MESSAGE_ALLOCATE_BUFFER, |
| 42 |
NULL, |
| 43 |
error, |
| 44 |
0, /* Default language */ |
| 45 |
(LPVOID)&msgbuf, |
| 46 |
0, |
| 47 |
NULL); |
| 48 |
if (chars != 0) { |
| 49 |
/* If there is an \r\n appended, zap it. */ |
| 50 |
if (chars >= 2 |
| 51 |
&& msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { |
| 52 |
chars -= 2; |
| 53 |
msgbuf[chars] = 0; |
| 54 |
} |
| 55 |
|
| 56 |
if (chars > sizeof (buf) - 1) { |
| 57 |
chars = sizeof (buf) - 1; |
| 58 |
msgbuf[chars] = 0; |
| 59 |
} |
| 60 |
|
| 61 |
wcstombs(buf, msgbuf, chars + 1); |
| 62 |
LocalFree(msgbuf); |
| 63 |
} |
| 64 |
else { |
| 65 |
sprintf(buf, "unknown win32 error (%ld)", error); |
| 66 |
} |
| 67 |
|
| 68 |
SetLastError(lasterr); |
| 69 |
return buf; |
| 70 |
} |
| 71 |
|
| 72 |
#endif /* UNDER_CE */ |
| 73 |
|
| 74 |
/* Reset gzip file state */ |
| 75 |
local void gz_reset(state) |
| 76 |
gz_statep state; |
| 77 |
{ |
| 78 |
state->x.have = 0; /* no output data available */ |
| 79 |
if (state->mode == GZ_READ) { /* for reading ... */ |
| 80 |
state->eof = 0; /* not at end of file */ |
| 81 |
state->past = 0; /* have not read past end yet */ |
| 82 |
state->how = LOOK; /* look for gzip header */ |
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} |
| 84 |
state->seek = 0; /* no seek request pending */ |
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gz_error(state, Z_OK, NULL); /* clear error */ |
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state->x.pos = 0; /* no uncompressed data yet */ |
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state->strm.avail_in = 0; /* no input data yet */ |
| 88 |
} |
| 89 |
|
| 90 |
/* Open a gzip file either by name or file descriptor. */ |
| 91 |
local gzFile gz_open(path, fd, mode) |
| 92 |
const void *path; |
| 93 |
int fd; |
| 94 |
const char *mode; |
| 95 |
{ |
| 96 |
gz_statep state; |
| 97 |
size_t len; |
| 98 |
int oflag; |
| 99 |
#ifdef O_CLOEXEC |
| 100 |
int cloexec = 0; |
| 101 |
#endif |
| 102 |
#ifdef O_EXCL |
| 103 |
int exclusive = 0; |
| 104 |
#endif |
| 105 |
|
| 106 |
/* check input */ |
| 107 |
if (path == NULL) |
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return NULL; |
| 109 |
|
| 110 |
/* allocate gzFile structure to return */ |
| 111 |
state = (gz_statep)malloc(sizeof(gz_state)); |
| 112 |
if (state == NULL) |
| 113 |
return NULL; |
| 114 |
state->size = 0; /* no buffers allocated yet */ |
| 115 |
state->want = GZBUFSIZE; /* requested buffer size */ |
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state->msg = NULL; /* no error message yet */ |
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|
| 118 |
/* interpret mode */ |
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state->mode = GZ_NONE; |
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state->level = Z_DEFAULT_COMPRESSION; |
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state->strategy = Z_DEFAULT_STRATEGY; |
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state->direct = 0; |
| 123 |
while (*mode) { |
| 124 |
if (*mode >= '0' && *mode <= '9') |
| 125 |
state->level = *mode - '0'; |
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else |
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switch (*mode) { |
| 128 |
case 'r': |
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state->mode = GZ_READ; |
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break; |
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#ifndef NO_GZCOMPRESS |
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case 'w': |
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state->mode = GZ_WRITE; |
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break; |
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case 'a': |
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state->mode = GZ_APPEND; |
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break; |
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#endif |
| 139 |
case '+': /* can't read and write at the same time */ |
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free(state); |
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return NULL; |
| 142 |
case 'b': /* ignore -- will request binary anyway */ |
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break; |
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#ifdef O_CLOEXEC |
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case 'e': |
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cloexec = 1; |
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break; |
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#endif |
| 149 |
#ifdef O_EXCL |
| 150 |
case 'x': |
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exclusive = 1; |
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break; |
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#endif |
| 154 |
case 'f': |
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state->strategy = Z_FILTERED; |
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break; |
| 157 |
case 'h': |
| 158 |
state->strategy = Z_HUFFMAN_ONLY; |
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break; |
| 160 |
case 'R': |
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state->strategy = Z_RLE; |
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break; |
| 163 |
case 'F': |
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state->strategy = Z_FIXED; |
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break; |
| 166 |
case 'T': |
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state->direct = 1; |
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break; |
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default: /* could consider as an error, but just ignore */ |
| 170 |
; |
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} |
| 172 |
mode++; |
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} |
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|
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/* must provide an "r", "w", or "a" */ |
| 176 |
if (state->mode == GZ_NONE) { |
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free(state); |
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return NULL; |
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} |
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|
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/* can't force transparent read */ |
| 182 |
if (state->mode == GZ_READ) { |
| 183 |
if (state->direct) { |
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free(state); |
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return NULL; |
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} |
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state->direct = 1; /* for empty file */ |
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} |
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|
| 190 |
/* save the path name for error messages */ |
| 191 |
#ifdef _WIN32 |
| 192 |
if (fd == -2) { |
| 193 |
len = wcstombs(NULL, path, 0); |
| 194 |
if (len == (size_t)-1) |
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len = 0; |
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} |
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else |
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#endif |
| 199 |
len = strlen((const char *)path); |
| 200 |
state->path = (char *)malloc(len + 1); |
| 201 |
if (state->path == NULL) { |
| 202 |
free(state); |
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return NULL; |
| 204 |
} |
| 205 |
#ifdef _WIN32 |
| 206 |
if (fd == -2) |
| 207 |
if (len) |
| 208 |
wcstombs(state->path, path, len + 1); |
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else |
| 210 |
*(state->path) = 0; |
| 211 |
else |
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#endif |
| 213 |
#if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
| 214 |
snprintf(state->path, len + 1, "%s", (const char *)path); |
| 215 |
#else |
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strcpy(state->path, path); |
| 217 |
#endif |
| 218 |
|
| 219 |
/* compute the flags for open() */ |
| 220 |
oflag = |
| 221 |
#ifdef O_LARGEFILE |
| 222 |
O_LARGEFILE | |
| 223 |
#endif |
| 224 |
#ifdef O_BINARY |
| 225 |
O_BINARY | |
| 226 |
#endif |
| 227 |
#ifdef O_CLOEXEC |
| 228 |
(cloexec ? O_CLOEXEC : 0) | |
| 229 |
#endif |
| 230 |
(state->mode == GZ_READ ? |
| 231 |
O_RDONLY : |
| 232 |
(O_WRONLY | O_CREAT | |
| 233 |
#ifdef O_EXCL |
| 234 |
(exclusive ? O_EXCL : 0) | |
| 235 |
#endif |
| 236 |
(state->mode == GZ_WRITE ? |
| 237 |
O_TRUNC : |
| 238 |
O_APPEND))); |
| 239 |
|
| 240 |
/* open the file with the appropriate flags (or just use fd) */ |
| 241 |
state->fd = fd > -1 ? fd : ( |
| 242 |
#ifdef _WIN32 |
| 243 |
fd == -2 ? _wopen(path, oflag, 0666) : |
| 244 |
#endif |
| 245 |
open((const char *)path, oflag, 0666)); |
| 246 |
if (state->fd == -1) { |
| 247 |
free(state->path); |
| 248 |
free(state); |
| 249 |
return NULL; |
| 250 |
} |
| 251 |
if (state->mode == GZ_APPEND) |
| 252 |
state->mode = GZ_WRITE; /* simplify later checks */ |
| 253 |
|
| 254 |
/* save the current position for rewinding (only if reading) */ |
| 255 |
if (state->mode == GZ_READ) { |
| 256 |
state->start = LSEEK(state->fd, 0, SEEK_CUR); |
| 257 |
if (state->start == -1) state->start = 0; |
| 258 |
} |
| 259 |
|
| 260 |
/* initialize stream */ |
| 261 |
gz_reset(state); |
| 262 |
|
| 263 |
/* return stream */ |
| 264 |
return (gzFile)state; |
| 265 |
} |
| 266 |
|
| 267 |
/* -- see zlib.h -- */ |
| 268 |
gzFile ZEXPORT gzopen(path, mode) |
| 269 |
const char *path; |
| 270 |
const char *mode; |
| 271 |
{ |
| 272 |
return gz_open(path, -1, mode); |
| 273 |
} |
| 274 |
|
| 275 |
/* -- see zlib.h -- */ |
| 276 |
gzFile ZEXPORT gzopen64(path, mode) |
| 277 |
const char *path; |
| 278 |
const char *mode; |
| 279 |
{ |
| 280 |
return gz_open(path, -1, mode); |
| 281 |
} |
| 282 |
|
| 283 |
/* -- see zlib.h -- */ |
| 284 |
gzFile ZEXPORT gzdopen(fd, mode) |
| 285 |
int fd; |
| 286 |
const char *mode; |
| 287 |
{ |
| 288 |
char *path; /* identifier for error messages */ |
| 289 |
gzFile gz; |
| 290 |
|
| 291 |
if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL) |
| 292 |
return NULL; |
| 293 |
#if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
| 294 |
snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd); /* for debugging */ |
| 295 |
#else |
| 296 |
sprintf(path, "<fd:%d>", fd); /* for debugging */ |
| 297 |
#endif |
| 298 |
gz = gz_open(path, fd, mode); |
| 299 |
free(path); |
| 300 |
return gz; |
| 301 |
} |
| 302 |
|
| 303 |
/* -- see zlib.h -- */ |
| 304 |
#ifdef _WIN32 |
| 305 |
gzFile ZEXPORT gzopen_w(path, mode) |
| 306 |
const wchar_t *path; |
| 307 |
const char *mode; |
| 308 |
{ |
| 309 |
return gz_open(path, -2, mode); |
| 310 |
} |
| 311 |
#endif |
| 312 |
|
| 313 |
/* -- see zlib.h -- */ |
| 314 |
int ZEXPORT gzbuffer(file, size) |
| 315 |
gzFile file; |
| 316 |
unsigned size; |
| 317 |
{ |
| 318 |
gz_statep state; |
| 319 |
|
| 320 |
/* get internal structure and check integrity */ |
| 321 |
if (file == NULL) |
| 322 |
return -1; |
| 323 |
state = (gz_statep)file; |
| 324 |
if (state->mode != GZ_READ && state->mode != GZ_WRITE) |
| 325 |
return -1; |
| 326 |
|
| 327 |
/* make sure we haven't already allocated memory */ |
| 328 |
if (state->size != 0) |
| 329 |
return -1; |
| 330 |
|
| 331 |
/* check and set requested size */ |
| 332 |
if (size < 2) |
| 333 |
size = 2; /* need two bytes to check magic header */ |
| 334 |
state->want = size; |
| 335 |
return 0; |
| 336 |
} |
| 337 |
|
| 338 |
/* -- see zlib.h -- */ |
| 339 |
int ZEXPORT gzrewind(file) |
| 340 |
gzFile file; |
| 341 |
{ |
| 342 |
gz_statep state; |
| 343 |
|
| 344 |
/* get internal structure */ |
| 345 |
if (file == NULL) |
| 346 |
return -1; |
| 347 |
state = (gz_statep)file; |
| 348 |
|
| 349 |
/* check that we're reading and that there's no error */ |
| 350 |
if (state->mode != GZ_READ || |
| 351 |
(state->err != Z_OK && state->err != Z_BUF_ERROR)) |
| 352 |
return -1; |
| 353 |
|
| 354 |
/* back up and start over */ |
| 355 |
if (LSEEK(state->fd, state->start, SEEK_SET) == -1) |
| 356 |
return -1; |
| 357 |
gz_reset(state); |
| 358 |
return 0; |
| 359 |
} |
| 360 |
|
| 361 |
/* -- see zlib.h -- */ |
| 362 |
z_off64_t ZEXPORT gzseek64(file, offset, whence) |
| 363 |
gzFile file; |
| 364 |
z_off64_t offset; |
| 365 |
int whence; |
| 366 |
{ |
| 367 |
unsigned n; |
| 368 |
z_off64_t ret; |
| 369 |
gz_statep state; |
| 370 |
|
| 371 |
/* get internal structure and check integrity */ |
| 372 |
if (file == NULL) |
| 373 |
return -1; |
| 374 |
state = (gz_statep)file; |
| 375 |
if (state->mode != GZ_READ && state->mode != GZ_WRITE) |
| 376 |
return -1; |
| 377 |
|
| 378 |
/* check that there's no error */ |
| 379 |
if (state->err != Z_OK && state->err != Z_BUF_ERROR) |
| 380 |
return -1; |
| 381 |
|
| 382 |
/* can only seek from start or relative to current position */ |
| 383 |
if (whence != SEEK_SET && whence != SEEK_CUR) |
| 384 |
return -1; |
| 385 |
|
| 386 |
/* normalize offset to a SEEK_CUR specification */ |
| 387 |
if (whence == SEEK_SET) |
| 388 |
offset -= state->x.pos; |
| 389 |
else if (state->seek) |
| 390 |
offset += state->skip; |
| 391 |
state->seek = 0; |
| 392 |
|
| 393 |
/* if within raw area while reading, just go there */ |
| 394 |
if (state->mode == GZ_READ && state->how == COPY && |
| 395 |
state->x.pos + offset >= 0) { |
| 396 |
ret = LSEEK(state->fd, offset - state->x.have, SEEK_CUR); |
| 397 |
if (ret == -1) |
| 398 |
return -1; |
| 399 |
state->x.have = 0; |
| 400 |
state->eof = 0; |
| 401 |
state->past = 0; |
| 402 |
state->seek = 0; |
| 403 |
gz_error(state, Z_OK, NULL); |
| 404 |
state->strm.avail_in = 0; |
| 405 |
state->x.pos += offset; |
| 406 |
return state->x.pos; |
| 407 |
} |
| 408 |
|
| 409 |
/* calculate skip amount, rewinding if needed for back seek when reading */ |
| 410 |
if (offset < 0) { |
| 411 |
if (state->mode != GZ_READ) /* writing -- can't go backwards */ |
| 412 |
return -1; |
| 413 |
offset += state->x.pos; |
| 414 |
if (offset < 0) /* before start of file! */ |
| 415 |
return -1; |
| 416 |
if (gzrewind(file) == -1) /* rewind, then skip to offset */ |
| 417 |
return -1; |
| 418 |
} |
| 419 |
|
| 420 |
/* if reading, skip what's in output buffer (one less gzgetc() check) */ |
| 421 |
if (state->mode == GZ_READ) { |
| 422 |
n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > offset ? |
| 423 |
(unsigned)offset : state->x.have; |
| 424 |
state->x.have -= n; |
| 425 |
state->x.next += n; |
| 426 |
state->x.pos += n; |
| 427 |
offset -= n; |
| 428 |
} |
| 429 |
|
| 430 |
/* request skip (if not zero) */ |
| 431 |
if (offset) { |
| 432 |
state->seek = 1; |
| 433 |
state->skip = offset; |
| 434 |
} |
| 435 |
return state->x.pos + offset; |
| 436 |
} |
| 437 |
|
| 438 |
/* -- see zlib.h -- */ |
| 439 |
z_off_t ZEXPORT gzseek(file, offset, whence) |
| 440 |
gzFile file; |
| 441 |
z_off_t offset; |
| 442 |
int whence; |
| 443 |
{ |
| 444 |
z_off64_t ret; |
| 445 |
|
| 446 |
ret = gzseek64(file, (z_off64_t)offset, whence); |
| 447 |
return ret == (z_off_t)ret ? (z_off_t)ret : -1; |
| 448 |
} |
| 449 |
|
| 450 |
/* -- see zlib.h -- */ |
| 451 |
z_off64_t ZEXPORT gztell64(file) |
| 452 |
gzFile file; |
| 453 |
{ |
| 454 |
gz_statep state; |
| 455 |
|
| 456 |
/* get internal structure and check integrity */ |
| 457 |
if (file == NULL) |
| 458 |
return -1; |
| 459 |
state = (gz_statep)file; |
| 460 |
if (state->mode != GZ_READ && state->mode != GZ_WRITE) |
| 461 |
return -1; |
| 462 |
|
| 463 |
/* return position */ |
| 464 |
return state->x.pos + (state->seek ? state->skip : 0); |
| 465 |
} |
| 466 |
|
| 467 |
/* -- see zlib.h -- */ |
| 468 |
z_off_t ZEXPORT gztell(file) |
| 469 |
gzFile file; |
| 470 |
{ |
| 471 |
z_off64_t ret; |
| 472 |
|
| 473 |
ret = gztell64(file); |
| 474 |
return ret == (z_off_t)ret ? (z_off_t)ret : -1; |
| 475 |
} |
| 476 |
|
| 477 |
/* -- see zlib.h -- */ |
| 478 |
z_off64_t ZEXPORT gzoffset64(file) |
| 479 |
gzFile file; |
| 480 |
{ |
| 481 |
z_off64_t offset; |
| 482 |
gz_statep state; |
| 483 |
|
| 484 |
/* get internal structure and check integrity */ |
| 485 |
if (file == NULL) |
| 486 |
return -1; |
| 487 |
state = (gz_statep)file; |
| 488 |
if (state->mode != GZ_READ && state->mode != GZ_WRITE) |
| 489 |
return -1; |
| 490 |
|
| 491 |
/* compute and return effective offset in file */ |
| 492 |
offset = LSEEK(state->fd, 0, SEEK_CUR); |
| 493 |
if (offset == -1) |
| 494 |
return -1; |
| 495 |
if (state->mode == GZ_READ) /* reading */ |
| 496 |
offset -= state->strm.avail_in; /* don't count buffered input */ |
| 497 |
return offset; |
| 498 |
} |
| 499 |
|
| 500 |
/* -- see zlib.h -- */ |
| 501 |
z_off_t ZEXPORT gzoffset(file) |
| 502 |
gzFile file; |
| 503 |
{ |
| 504 |
z_off64_t ret; |
| 505 |
|
| 506 |
ret = gzoffset64(file); |
| 507 |
return ret == (z_off_t)ret ? (z_off_t)ret : -1; |
| 508 |
} |
| 509 |
|
| 510 |
/* -- see zlib.h -- */ |
| 511 |
int ZEXPORT gzeof(file) |
| 512 |
gzFile file; |
| 513 |
{ |
| 514 |
gz_statep state; |
| 515 |
|
| 516 |
/* get internal structure and check integrity */ |
| 517 |
if (file == NULL) |
| 518 |
return 0; |
| 519 |
state = (gz_statep)file; |
| 520 |
if (state->mode != GZ_READ && state->mode != GZ_WRITE) |
| 521 |
return 0; |
| 522 |
|
| 523 |
/* return end-of-file state */ |
| 524 |
return state->mode == GZ_READ ? state->past : 0; |
| 525 |
} |
| 526 |
|
| 527 |
/* -- see zlib.h -- */ |
| 528 |
const char * ZEXPORT gzerror(file, errnum) |
| 529 |
gzFile file; |
| 530 |
int *errnum; |
| 531 |
{ |
| 532 |
gz_statep state; |
| 533 |
|
| 534 |
/* get internal structure and check integrity */ |
| 535 |
if (file == NULL) |
| 536 |
return NULL; |
| 537 |
state = (gz_statep)file; |
| 538 |
if (state->mode != GZ_READ && state->mode != GZ_WRITE) |
| 539 |
return NULL; |
| 540 |
|
| 541 |
/* return error information */ |
| 542 |
if (errnum != NULL) |
| 543 |
*errnum = state->err; |
| 544 |
return state->err == Z_MEM_ERROR ? "out of memory" : |
| 545 |
(state->msg == NULL ? "" : state->msg); |
| 546 |
} |
| 547 |
|
| 548 |
/* -- see zlib.h -- */ |
| 549 |
void ZEXPORT gzclearerr(file) |
| 550 |
gzFile file; |
| 551 |
{ |
| 552 |
gz_statep state; |
| 553 |
|
| 554 |
/* get internal structure and check integrity */ |
| 555 |
if (file == NULL) |
| 556 |
return; |
| 557 |
state = (gz_statep)file; |
| 558 |
if (state->mode != GZ_READ && state->mode != GZ_WRITE) |
| 559 |
return; |
| 560 |
|
| 561 |
/* clear error and end-of-file */ |
| 562 |
if (state->mode == GZ_READ) { |
| 563 |
state->eof = 0; |
| 564 |
state->past = 0; |
| 565 |
} |
| 566 |
gz_error(state, Z_OK, NULL); |
| 567 |
} |
| 568 |
|
| 569 |
/* Create an error message in allocated memory and set state->err and |
| 570 |
state->msg accordingly. Free any previous error message already there. Do |
| 571 |
not try to free or allocate space if the error is Z_MEM_ERROR (out of |
| 572 |
memory). Simply save the error message as a static string. If there is an |
| 573 |
allocation failure constructing the error message, then convert the error to |
| 574 |
out of memory. */ |
| 575 |
void ZLIB_INTERNAL gz_error(state, err, msg) |
| 576 |
gz_statep state; |
| 577 |
int err; |
| 578 |
const char *msg; |
| 579 |
{ |
| 580 |
/* free previously allocated message and clear */ |
| 581 |
if (state->msg != NULL) { |
| 582 |
if (state->err != Z_MEM_ERROR) |
| 583 |
free(state->msg); |
| 584 |
state->msg = NULL; |
| 585 |
} |
| 586 |
|
| 587 |
/* if fatal, set state->x.have to 0 so that the gzgetc() macro fails */ |
| 588 |
if (err != Z_OK && err != Z_BUF_ERROR) |
| 589 |
state->x.have = 0; |
| 590 |
|
| 591 |
/* set error code, and if no message, then done */ |
| 592 |
state->err = err; |
| 593 |
if (msg == NULL) |
| 594 |
return; |
| 595 |
|
| 596 |
/* for an out of memory error, return literal string when requested */ |
| 597 |
if (err == Z_MEM_ERROR) |
| 598 |
return; |
| 599 |
|
| 600 |
/* construct error message with path */ |
| 601 |
if ((state->msg = (char *)malloc(strlen(state->path) + strlen(msg) + 3)) == |
| 602 |
NULL) { |
| 603 |
state->err = Z_MEM_ERROR; |
| 604 |
return; |
| 605 |
} |
| 606 |
#if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
| 607 |
snprintf(state->msg, strlen(state->path) + strlen(msg) + 3, |
| 608 |
"%s%s%s", state->path, ": ", msg); |
| 609 |
#else |
| 610 |
strcpy(state->msg, state->path); |
| 611 |
strcat(state->msg, ": "); |
| 612 |
strcat(state->msg, msg); |
| 613 |
#endif |
| 614 |
return; |
| 615 |
} |
| 616 |
|
| 617 |
#ifndef INT_MAX |
| 618 |
/* portably return maximum value for an int (when limits.h presumed not |
| 619 |
available) -- we need to do this to cover cases where 2's complement not |
| 620 |
used, since C standard permits 1's complement and sign-bit representations, |
| 621 |
otherwise we could just use ((unsigned)-1) >> 1 */ |
| 622 |
unsigned ZLIB_INTERNAL gz_intmax() |
| 623 |
{ |
| 624 |
unsigned p, q; |
| 625 |
|
| 626 |
p = 1; |
| 627 |
do { |
| 628 |
q = p; |
| 629 |
p <<= 1; |
| 630 |
p++; |
| 631 |
} while (p > q); |
| 632 |
return q >> 1; |
| 633 |
} |
| 634 |
#endif |
