1
/* minigzip.c -- simulate gzip using the zlib compression library
2
* Copyright (C) 1995-2006, 2010 Jean-loup Gailly.
3
* For conditions of distribution and use, see copyright notice in zlib.h
7
* minigzip is a minimal implementation of the gzip utility. This is
8
* only an example of using zlib and isn't meant to replace the
9
* full-featured gzip. No attempt is made to deal with file systems
10
* limiting names to 14 or 8+3 characters, etc... Error checking is
11
* very limited. So use minigzip only for testing; use gzip for the
12
* real thing. On MSDOS, use only on file names without extension
27
# include <sys/types.h>
28
# include <sys/mman.h>
29
# include <sys/stat.h>
32
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
38
# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
40
# define SET_BINARY_MODE(file)
44
# define unlink delete
45
# define GZ_SUFFIX "-gz"
48
# define unlink remove
49
# define GZ_SUFFIX "-gz"
50
# define fileno(file) file->__file
52
#if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
53
# include <unix.h> /* for fileno */
56
#if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE)
57
#ifndef WIN32 /* unlink already in stdio.h for WIN32 */
58
extern int unlink OF((const char *));
64
# define perror(s) pwinerror(s)
66
/* Map the Windows error number in ERROR to a locale-dependent error
67
message string and return a pointer to it. Typically, the values
68
for ERROR come from GetLastError.
70
The string pointed to shall not be modified by the application,
71
but may be overwritten by a subsequent call to strwinerror
73
The strwinerror function does not change the current setting
76
static char *strwinerror (error)
79
static char buf[1024];
82
DWORD lasterr = GetLastError();
83
DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
84
| FORMAT_MESSAGE_ALLOCATE_BUFFER,
87
0, /* Default language */
92
/* If there is an \r\n appended, zap it. */
94
&& msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {
99
if (chars > sizeof (buf) - 1) {
100
chars = sizeof (buf) - 1;
104
wcstombs(buf, msgbuf, chars + 1);
108
sprintf(buf, "unknown win32 error (%ld)", error);
111
SetLastError(lasterr);
115
static void pwinerror (s)
119
fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ()));
121
fprintf(stderr, "%s\n", strwinerror(GetLastError ()));
124
#endif /* UNDER_CE */
127
# define GZ_SUFFIX ".gz"
129
#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
132
#define MAX_NAME_LEN 1024
135
# define local static
136
/* Needed for systems with limitation on stack size. */
143
void error OF((const char *msg));
144
void gz_compress OF((FILE *in, gzFile out));
146
int gz_compress_mmap OF((FILE *in, gzFile out));
148
void gz_uncompress OF((gzFile in, FILE *out));
149
void file_compress OF((char *file, char *mode));
150
void file_uncompress OF((char *file));
151
int main OF((int argc, char *argv[]));
153
/* ===========================================================================
154
* Display error message and exit
159
fprintf(stderr, "%s: %s\n", prog, msg);
163
/* ===========================================================================
164
* Compress input to output then close both files.
167
void gz_compress(in, out)
171
local char buf[BUFLEN];
176
/* Try first compressing with mmap. If mmap fails (minigzip used in a
177
* pipe), use the normal fread loop.
179
if (gz_compress_mmap(in, out) == Z_OK) return;
182
len = (int)fread(buf, 1, sizeof(buf), in);
189
if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));
192
if (gzclose(out) != Z_OK) error("failed gzclose");
195
#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
197
/* Try compressing the input file at once using mmap. Return Z_OK if
198
* if success, Z_ERRNO otherwise.
200
int gz_compress_mmap(in, out)
206
int ifd = fileno(in);
207
caddr_t buf; /* mmap'ed buffer for the entire input file */
208
off_t buf_len; /* length of the input file */
211
/* Determine the size of the file, needed for mmap: */
212
if (fstat(ifd, &sb) < 0) return Z_ERRNO;
213
buf_len = sb.st_size;
214
if (buf_len <= 0) return Z_ERRNO;
216
/* Now do the actual mmap: */
217
buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
218
if (buf == (caddr_t)(-1)) return Z_ERRNO;
220
/* Compress the whole file at once: */
221
len = gzwrite(out, (char *)buf, (unsigned)buf_len);
223
if (len != (int)buf_len) error(gzerror(out, &err));
225
munmap(buf, buf_len);
227
if (gzclose(out) != Z_OK) error("failed gzclose");
230
#endif /* USE_MMAP */
232
/* ===========================================================================
233
* Uncompress input to output then close both files.
235
void gz_uncompress(in, out)
239
local char buf[BUFLEN];
244
len = gzread(in, buf, sizeof(buf));
245
if (len < 0) error (gzerror(in, &err));
248
if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
249
error("failed fwrite");
252
if (fclose(out)) error("failed fclose");
254
if (gzclose(in) != Z_OK) error("failed gzclose");
258
/* ===========================================================================
259
* Compress the given file: create a corresponding .gz file and remove the
262
void file_compress(file, mode)
266
local char outfile[MAX_NAME_LEN];
270
if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) {
271
fprintf(stderr, "%s: filename too long\n", prog);
275
strcpy(outfile, file);
276
strcat(outfile, GZ_SUFFIX);
278
in = fopen(file, "rb");
283
out = gzopen(outfile, mode);
285
fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
288
gz_compress(in, out);
294
/* ===========================================================================
295
* Uncompress the given file and remove the original.
297
void file_uncompress(file)
300
local char buf[MAX_NAME_LEN];
301
char *infile, *outfile;
304
size_t len = strlen(file);
306
if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) {
307
fprintf(stderr, "%s: filename too long\n", prog);
313
if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {
316
outfile[len-3] = '\0';
320
strcat(infile, GZ_SUFFIX);
322
in = gzopen(infile, "rb");
324
fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);
327
out = fopen(outfile, "wb");
333
gz_uncompress(in, out);
339
/* ===========================================================================
340
* Usage: minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...]
341
* -c : write to standard output
343
* -f : compress with Z_FILTERED
344
* -h : compress with Z_HUFFMAN_ONLY
345
* -r : compress with Z_RLE
346
* -1 to -9 : compression level
356
char *bname, outmode[20];
358
strcpy(outmode, "wb6 ");
361
bname = strrchr(argv[0], '/');
368
if (!strcmp(bname, "gunzip"))
370
else if (!strcmp(bname, "zcat"))
371
copyout = uncompr = 1;
374
if (strcmp(*argv, "-c") == 0)
376
else if (strcmp(*argv, "-d") == 0)
378
else if (strcmp(*argv, "-f") == 0)
380
else if (strcmp(*argv, "-h") == 0)
382
else if (strcmp(*argv, "-r") == 0)
384
else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&
386
outmode[2] = (*argv)[1];
391
if (outmode[3] == ' ')
394
SET_BINARY_MODE(stdin);
395
SET_BINARY_MODE(stdout);
397
file = gzdopen(fileno(stdin), "rb");
398
if (file == NULL) error("can't gzdopen stdin");
399
gz_uncompress(file, stdout);
401
file = gzdopen(fileno(stdout), outmode);
402
if (file == NULL) error("can't gzdopen stdout");
403
gz_compress(stdin, file);
407
SET_BINARY_MODE(stdout);
412
file = gzopen(*argv, "rb");
414
fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv);
416
gz_uncompress(file, stdout);
418
file_uncompress(*argv);
422
FILE * in = fopen(*argv, "rb");
427
file = gzdopen(fileno(stdout), outmode);
428
if (file == NULL) error("can't gzdopen stdout");
430
gz_compress(in, file);
434
file_compress(*argv, outmode);
437
} while (argv++, --argc);
added
removed
win32/3rdparty/zlib/minigzip.c
