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/* minigzip.c -- simulate gzip using the zlib compression library
 * Copyright (C) 1995-2005 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
 
/*
 * minigzip is a minimal implementation of the gzip utility. This is
 * only an example of using zlib and isn't meant to replace the
 * full-featured gzip. No attempt is made to deal with file systems
 * limiting names to 14 or 8+3 characters, etc... Error checking is
 * very limited. So use minigzip only for testing; use gzip for the
 * real thing. On MSDOS, use only on file names without extension
 * or in pipe mode.
 */
 
/* @(#) $Id$ */
 
#include <stdio.h>
#include "zlib.h"
 
#ifdef STDC
#  include <string.h>
#  include <stdlib.h>
#endif
 
#ifdef USE_MMAP
#  include <sys/types.h>
#  include <sys/mman.h>
#  include <sys/stat.h>
#endif
 
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
#  include <fcntl.h>
#  include <io.h>
#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
#  define SET_BINARY_MODE(file)
#endif
 
#ifdef VMS
#  define unlink delete
#  define GZ_SUFFIX "-gz"
#endif
#ifdef RISCOS
#  define unlink remove
#  define GZ_SUFFIX "-gz"
#  define fileno(file) file->__file
#endif
#if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
#  include <unix.h> /* for fileno */
#endif
 
#ifndef WIN32 /* unlink already in stdio.h for WIN32 */
  extern int unlink OF((const char *));
#endif
 
#ifndef GZ_SUFFIX
#  define GZ_SUFFIX ".gz"
#endif
#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
 
#define BUFLEN      16384
#define MAX_NAME_LEN 1024
 
#ifdef MAXSEG_64K
#  define local static
   /* Needed for systems with limitation on stack size. */
#else
#  define local
#endif
 
char *prog;
 
void error            OF((const char *msg));
void gz_compress      OF((FILE   *in, gzFile out));
#ifdef USE_MMAP
int  gz_compress_mmap OF((FILE   *in, gzFile out));
#endif
void gz_uncompress    OF((gzFile in, FILE   *out));
void file_compress    OF((char  *file, char *mode));
void file_uncompress  OF((char  *file));
int  main             OF((int argc, char *argv[]));
 
/* ===========================================================================
 * Display error message and exit
 */
void error(msg)
    const char *msg;
{
    fprintf(stderr, "%s: %s\n", prog, msg);
    exit(1);
}
 
/* ===========================================================================
 * Compress input to output then close both files.
 */
 
void gz_compress(in, out)
    FILE   *in;
    gzFile out;
{
    local char buf[BUFLEN];
    int len;
    int err;
 
#ifdef USE_MMAP
    /* Try first compressing with mmap. If mmap fails (minigzip used in a
     * pipe), use the normal fread loop.
     */
    if (gz_compress_mmap(in, out) == Z_OK) return;
#endif
    for (;;) {
        len = (int)fread(buf, 1, sizeof(buf), in);
        if (ferror(in)) {
            perror("fread");
            exit(1);
        }
        if (len == 0) break;
 
        if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));
    }
    fclose(in);
    if (gzclose(out) != Z_OK) error("failed gzclose");
}
 
#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
 
/* Try compressing the input file at once using mmap. Return Z_OK if
 * if success, Z_ERRNO otherwise.
 */
int gz_compress_mmap(in, out)
    FILE   *in;
    gzFile out;
{
    int len;
    int err;
    int ifd = fileno(in);
    caddr_t buf;    /* mmap'ed buffer for the entire input file */
    off_t buf_len;  /* length of the input file */
    struct stat sb;
 
    /* Determine the size of the file, needed for mmap: */
    if (fstat(ifd, &sb) < 0) return Z_ERRNO;
    buf_len = sb.st_size;
    if (buf_len <= 0) return Z_ERRNO;
 
    /* Now do the actual mmap: */
    buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
    if (buf == (caddr_t)(-1)) return Z_ERRNO;
 
    /* Compress the whole file at once: */
    len = gzwrite(out, (char *)buf, (unsigned)buf_len);
 
    if (len != (int)buf_len) error(gzerror(out, &err));
 
    munmap(buf, buf_len);
    fclose(in);
    if (gzclose(out) != Z_OK) error("failed gzclose");
    return Z_OK;
}
#endif /* USE_MMAP */
 
/* ===========================================================================
 * Uncompress input to output then close both files.
 */
void gz_uncompress(in, out)
    gzFile in;
    FILE   *out;
{
    local char buf[BUFLEN];
    int len;
    int err;
 
    for (;;) {
        len = gzread(in, buf, sizeof(buf));
        if (len < 0) error (gzerror(in, &err));
        if (len == 0) break;
 
        if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
            error("failed fwrite");
        }
    }
    if (fclose(out)) error("failed fclose");
 
    if (gzclose(in) != Z_OK) error("failed gzclose");
}
 
 
/* ===========================================================================
 * Compress the given file: create a corresponding .gz file and remove the
 * original.
 */
void file_compress(file, mode)
    char  *file;
    char  *mode;
{
    local char outfile[MAX_NAME_LEN];
    FILE  *in;
    gzFile out;
 
    strcpy(outfile, file);
    strcat(outfile, GZ_SUFFIX);
 
    in = fopen(file, "rb");
    if (in == NULL) {
        perror(file);
        exit(1);
    }
    out = gzopen(outfile, mode);
    if (out == NULL) {
        fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
        exit(1);
    }
    gz_compress(in, out);
 
    unlink(file);
}
 
 
/* ===========================================================================
 * Uncompress the given file and remove the original.
 */
void file_uncompress(file)
    char  *file;
{
    local char buf[MAX_NAME_LEN];
    char *infile, *outfile;
    FILE  *out;
    gzFile in;
    uInt len = (uInt)strlen(file);
 
    strcpy(buf, file);
 
    if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {
        infile = file;
        outfile = buf;
        outfile[len-3] = '\0';
    } else {
        outfile = file;
        infile = buf;
        strcat(infile, GZ_SUFFIX);
    }
    in = gzopen(infile, "rb");
    if (in == NULL) {
        fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);
        exit(1);
    }
    out = fopen(outfile, "wb");
    if (out == NULL) {
        perror(file);
        exit(1);
    }
 
    gz_uncompress(in, out);
 
    unlink(infile);
}
 
 
/* ===========================================================================
 * Usage:  minigzip [-d] [-f] [-h] [-r] [-1 to -9] [files...]
 *   -d : decompress
 *   -f : compress with Z_FILTERED
 *   -h : compress with Z_HUFFMAN_ONLY
 *   -r : compress with Z_RLE
 *   -1 to -9 : compression level
 */
 
int main(argc, argv)
    int argc;
    char *argv[];
{
    int uncompr = 0;
    gzFile file;
    char outmode[20];
 
    strcpy(outmode, "wb6 ");
 
    prog = argv[0];
    argc--, argv++;
 
    while (argc > 0) {
      if (strcmp(*argv, "-d") == 0)
        uncompr = 1;
      else if (strcmp(*argv, "-f") == 0)
        outmode[3] = 'f';
      else if (strcmp(*argv, "-h") == 0)
        outmode[3] = 'h';
      else if (strcmp(*argv, "-r") == 0)
        outmode[3] = 'R';
      else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&
               (*argv)[2] == 0)
        outmode[2] = (*argv)[1];
      else
        break;
      argc--, argv++;
    }
    if (outmode[3] == ' ')
        outmode[3] = 0;
    if (argc == 0) {
        SET_BINARY_MODE(stdin);
        SET_BINARY_MODE(stdout);
        if (uncompr) {
            file = gzdopen(fileno(stdin), "rb");
            if (file == NULL) error("can't gzdopen stdin");
            gz_uncompress(file, stdout);
        } else {
            file = gzdopen(fileno(stdout), outmode);
            if (file == NULL) error("can't gzdopen stdout");
            gz_compress(stdin, file);
        }
    } else {
        do {
            if (uncompr) {
                file_uncompress(*argv);
            } else {
                file_compress(*argv, outmode);
            }
        } while (argv++, --argc);
    }
    return 0;
}

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[/] [openrisc/] [trunk/] [rtos/] [ecos-3.0/] [packages/] [services/] [compress/] [zlib/] [current/] [src/] [minigzip.c] - Blame information for rev 856

Line No.	Rev	Author	Line
1	786	skrzyp	`/* minigzip.c -- simulate gzip using the zlib compression library`
2			`* Copyright (C) 1995-2005 Jean-loup Gailly.`
3			`* For conditions of distribution and use, see copyright notice in zlib.h`
4			`*/`
5
6			`/*`
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`
13			`* or in pipe mode.`
14			`*/`
15
16			`/* @(#) $Id$ */`
17
18			`#include <stdio.h>`
19			`#include "zlib.h"`
20
21			`#ifdef STDC`
22			`# include <string.h>`
23			`# include <stdlib.h>`
24			`#endif`
25
26			`#ifdef USE_MMAP`
27			`# include <sys/types.h>`
28			`# include <sys/mman.h>`
29			`# include <sys/stat.h>`
30			`#endif`
31
32			`#if defined(MSDOS) \|\| defined(OS2) \|\| defined(WIN32) \|\| defined(__CYGWIN__)`
33			`# include <fcntl.h>`
34			`# include <io.h>`
35			`# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)`
36			`#else`
37			`# define SET_BINARY_MODE(file)`
38			`#endif`
39
40			`#ifdef VMS`
41			`# define unlink delete`
42			`# define GZ_SUFFIX "-gz"`
43			`#endif`
44			`#ifdef RISCOS`
45			`# define unlink remove`
46			`# define GZ_SUFFIX "-gz"`
47			`# define fileno(file) file->__file`
48			`#endif`
49			`#if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os`
50			`# include <unix.h> /* for fileno */`
51			`#endif`
52
53			`#ifndef WIN32 /* unlink already in stdio.h for WIN32 */`
54			`extern int unlink OF((const char *));`
55			`#endif`
56
57			`#ifndef GZ_SUFFIX`
58			`# define GZ_SUFFIX ".gz"`
59			`#endif`
60			`#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)`
61
62			`#define BUFLEN 16384`
63			`#define MAX_NAME_LEN 1024`
64
65			`#ifdef MAXSEG_64K`
66			`# define local static`
67			`/* Needed for systems with limitation on stack size. */`
68			`#else`
69			`# define local`
70			`#endif`
71
72			`char *prog;`
73
74			`void error OF((const char *msg));`
75			`void gz_compress OF((FILE *in, gzFile out));`
76			`#ifdef USE_MMAP`
77			`int gz_compress_mmap OF((FILE *in, gzFile out));`
78			`#endif`
79			`void gz_uncompress OF((gzFile in, FILE *out));`
80			`void file_compress OF((char file, char mode));`
81			`void file_uncompress OF((char *file));`
82			`int main OF((int argc, char *argv[]));`
83
84			`/* ===========================================================================`
85			`* Display error message and exit`
86			`*/`
87			`void error(msg)`
88			`const char *msg;`
89			`{`
90			`fprintf(stderr, "%s: %s\n", prog, msg);`
91			`exit(1);`
92			`}`
93
94			`/* ===========================================================================`
95			`* Compress input to output then close both files.`
96			`*/`
97
98			`void gz_compress(in, out)`
99			`FILE *in;`
100			`gzFile out;`
101			`{`
102			`local char buf[BUFLEN];`
103			`int len;`
104			`int err;`
105
106			`#ifdef USE_MMAP`
107			`/* Try first compressing with mmap. If mmap fails (minigzip used in a`
108			`* pipe), use the normal fread loop.`
109			`*/`
110			`if (gz_compress_mmap(in, out) == Z_OK) return;`
111			`#endif`
112			`for (;;) {`
113			`len = (int)fread(buf, 1, sizeof(buf), in);`
114			`if (ferror(in)) {`
115			`perror("fread");`
116			`exit(1);`
117			`}`
118			`if (len == 0) break;`
119
120			`if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));`
121			`}`
122			`fclose(in);`
123			`if (gzclose(out) != Z_OK) error("failed gzclose");`
124			`}`
125
126			`#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */`
127
128			`/* Try compressing the input file at once using mmap. Return Z_OK if`
129			`* if success, Z_ERRNO otherwise.`
130			`*/`
131			`int gz_compress_mmap(in, out)`
132			`FILE *in;`
133			`gzFile out;`
134			`{`
135			`int len;`
136			`int err;`
137			`int ifd = fileno(in);`
138			`caddr_t buf; /* mmap'ed buffer for the entire input file */`
139			`off_t buf_len; /* length of the input file */`
140			`struct stat sb;`
141
142			`/* Determine the size of the file, needed for mmap: */`
143			`if (fstat(ifd, &sb) < 0) return Z_ERRNO;`
144			`buf_len = sb.st_size;`
145			`if (buf_len <= 0) return Z_ERRNO;`
146
147			`/* Now do the actual mmap: */`
148			`buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);`
149			`if (buf == (caddr_t)(-1)) return Z_ERRNO;`
150
151			`/* Compress the whole file at once: */`
152			`len = gzwrite(out, (char *)buf, (unsigned)buf_len);`
153
154			`if (len != (int)buf_len) error(gzerror(out, &err));`
155
156			`munmap(buf, buf_len);`
157			`fclose(in);`
158			`if (gzclose(out) != Z_OK) error("failed gzclose");`
159			`return Z_OK;`
160			`}`
161			`#endif /* USE_MMAP */`
162
163			`/* ===========================================================================`
164			`* Uncompress input to output then close both files.`
165			`*/`
166			`void gz_uncompress(in, out)`
167			`gzFile in;`
168			`FILE *out;`
169			`{`
170			`local char buf[BUFLEN];`
171			`int len;`
172			`int err;`
173
174			`for (;;) {`
175			`len = gzread(in, buf, sizeof(buf));`
176			`if (len < 0) error (gzerror(in, &err));`
177			`if (len == 0) break;`
178
179			`if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {`
180			`error("failed fwrite");`
181			`}`
182			`}`
183			`if (fclose(out)) error("failed fclose");`
184
185			`if (gzclose(in) != Z_OK) error("failed gzclose");`
186			`}`
187
188
189			`/* ===========================================================================`
190			`* Compress the given file: create a corresponding .gz file and remove the`
191			`* original.`
192			`*/`
193			`void file_compress(file, mode)`
194			`char *file;`
195			`char *mode;`
196			`{`
197			`local char outfile[MAX_NAME_LEN];`
198			`FILE *in;`
199			`gzFile out;`
200
201			`strcpy(outfile, file);`
202			`strcat(outfile, GZ_SUFFIX);`
203
204			`in = fopen(file, "rb");`
205			`if (in == NULL) {`
206			`perror(file);`
207			`exit(1);`
208			`}`
209			`out = gzopen(outfile, mode);`
210			`if (out == NULL) {`
211			`fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);`
212			`exit(1);`
213			`}`
214			`gz_compress(in, out);`
215
216			`unlink(file);`
217			`}`
218
219
220			`/* ===========================================================================`
221			`* Uncompress the given file and remove the original.`
222			`*/`
223			`void file_uncompress(file)`
224			`char *file;`
225			`{`
226			`local char buf[MAX_NAME_LEN];`
227			`char infile, outfile;`
228			`FILE *out;`
229			`gzFile in;`
230			`uInt len = (uInt)strlen(file);`
231
232			`strcpy(buf, file);`
233
234			`if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {`
235			`infile = file;`
236			`outfile = buf;`
237			`outfile[len-3] = '\0';`
238			`} else {`
239			`outfile = file;`
240			`infile = buf;`
241			`strcat(infile, GZ_SUFFIX);`
242			`}`
243			`in = gzopen(infile, "rb");`
244			`if (in == NULL) {`
245			`fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);`
246			`exit(1);`
247			`}`
248			`out = fopen(outfile, "wb");`
249			`if (out == NULL) {`
250			`perror(file);`
251			`exit(1);`
252			`}`
253
254			`gz_uncompress(in, out);`
255
256			`unlink(infile);`
257			`}`
258
259
260			`/* ===========================================================================`
261			`* Usage: minigzip [-d] [-f] [-h] [-r] [-1 to -9] [files...]`
262			`* -d : decompress`
263			`* -f : compress with Z_FILTERED`
264			`* -h : compress with Z_HUFFMAN_ONLY`
265			`* -r : compress with Z_RLE`
266			`* -1 to -9 : compression level`
267			`*/`
268
269			`int main(argc, argv)`
270			`int argc;`
271			`char *argv[];`
272			`{`
273			`int uncompr = 0;`
274			`gzFile file;`
275			`char outmode[20];`
276
277			`strcpy(outmode, "wb6 ");`
278
279			`prog = argv[0];`
280			`argc--, argv++;`
281
282			`while (argc > 0) {`
283			`if (strcmp(*argv, "-d") == 0)`
284			`uncompr = 1;`
285			`else if (strcmp(*argv, "-f") == 0)`
286			`outmode[3] = 'f';`
287			`else if (strcmp(*argv, "-h") == 0)`
288			`outmode[3] = 'h';`
289			`else if (strcmp(*argv, "-r") == 0)`
290			`outmode[3] = 'R';`
291			`else if ((argv)[0] == '-' && (argv)[1] >= '1' && (*argv)[1] <= '9' &&`
292			`(*argv)[2] == 0)`
293			`outmode[2] = (*argv)[1];`
294			`else`
295			`break;`
296			`argc--, argv++;`
297			`}`
298			`if (outmode[3] == ' ')`
299			`outmode[3] = 0;`
300			`if (argc == 0) {`
301			`SET_BINARY_MODE(stdin);`
302			`SET_BINARY_MODE(stdout);`
303			`if (uncompr) {`
304			`file = gzdopen(fileno(stdin), "rb");`
305			`if (file == NULL) error("can't gzdopen stdin");`
306			`gz_uncompress(file, stdout);`
307			`} else {`
308			`file = gzdopen(fileno(stdout), outmode);`
309			`if (file == NULL) error("can't gzdopen stdout");`
310			`gz_compress(stdin, file);`
311			`}`
312			`} else {`
313			`do {`
314			`if (uncompr) {`
315			`file_uncompress(*argv);`
316			`} else {`
317			`file_compress(*argv, outmode);`
318			`}`
319			`} while (argv++, --argc);`
320			`}`
321			`return 0;`
322			`}`