zlib-1.2.8/examples/zpipe.c

/* zpipe.c: example of proper use of zlib's inflate() and deflate()
   Not copyrighted -- provided to the public domain
   Version 1.4  11 December 2005  Mark Adler */

/* Version history:
   1.0  30 Oct 2004  First version
   1.1   8 Nov 2004  Add void casting for unused return values
                     Use switch statement for inflate() return values
   1.2   9 Nov 2004  Add assertions to document zlib guarantees
   1.3   6 Apr 2005  Remove incorrect assertion in inf()
   1.4  11 Dec 2005  Add hack to avoid MSDOS end-of-line conversions
                     Avoid some compiler warnings for input and output buffers
 */

#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "zlib.h"

#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

#define CHUNK 16384

/* Compress from file source to file dest until EOF on source.
   def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
   allocated for processing, Z_STREAM_ERROR if an invalid compression
   level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
   version of the library linked do not match, or Z_ERRNO if there is
   an error reading or writing the files. */
int def(FILE *source, FILE *dest, int level)
{
    int ret, flush;
    unsigned have;
    z_stream strm;
    unsigned char in[CHUNK];
    unsigned char out[CHUNK];

    /* allocate deflate state */
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    ret = deflateInit(&strm, level);
    if (ret != Z_OK)
        return ret;

    /* compress until end of file */
    do {
        strm.avail_in = fread(in, 1, CHUNK, source);
        if (ferror(source)) {
            (void)deflateEnd(&strm);
            return Z_ERRNO;
        }
        flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
        strm.next_in = in;

        /* run deflate() on input until output buffer not full, finish
           compression if all of source has been read in */
        do {
            strm.avail_out = CHUNK;
            strm.next_out = out;
            ret = deflate(&strm, flush);    /* no bad return value */
            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
            have = CHUNK - strm.avail_out;
            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
                (void)deflateEnd(&strm);
                return Z_ERRNO;
            }
        } while (strm.avail_out == 0);
        assert(strm.avail_in == 0);     /* all input will be used */

        /* done when last data in file processed */
    } while (flush != Z_FINISH);
    assert(ret == Z_STREAM_END);        /* stream will be complete */

    /* clean up and return */
    (void)deflateEnd(&strm);
    return Z_OK;
}

/* Decompress from file source to file dest until stream ends or EOF.
   inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
   allocated for processing, Z_DATA_ERROR if the deflate data is
   invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
   the version of the library linked do not match, or Z_ERRNO if there
   is an error reading or writing the files. */
int inf(FILE *source, FILE *dest)
{
    int ret;
    unsigned have;
    z_stream strm;
    unsigned char in[CHUNK];
    unsigned char out[CHUNK];

    /* allocate inflate state */
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    strm.avail_in = 0;
    strm.next_in = Z_NULL;
    ret = inflateInit(&strm);
    if (ret != Z_OK)
        return ret;

    /* decompress until deflate stream ends or end of file */
    do {
        strm.avail_in = fread(in, 1, CHUNK, source);
        if (ferror(source)) {
            (void)inflateEnd(&strm);
            return Z_ERRNO;
        }
        if (strm.avail_in == 0)
            break;
        strm.next_in = in;

        /* run inflate() on input until output buffer not full */
        do {
            strm.avail_out = CHUNK;
            strm.next_out = out;
            ret = inflate(&strm, Z_NO_FLUSH);
            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
            switch (ret) {
            case Z_NEED_DICT:
                ret = Z_DATA_ERROR;     /* and fall through */
            case Z_DATA_ERROR:
            case Z_MEM_ERROR:
                (void)inflateEnd(&strm);
                return ret;
            }
            have = CHUNK - strm.avail_out;
            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
                (void)inflateEnd(&strm);
                return Z_ERRNO;
            }
        } while (strm.avail_out == 0);

        /* done when inflate() says it's done */
    } while (ret != Z_STREAM_END);

    /* clean up and return */
    (void)inflateEnd(&strm);
    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
}

/* report a zlib or i/o error */
void zerr(int ret)
{
    fputs("zpipe: ", stderr);
    switch (ret) {
    case Z_ERRNO:
        if (ferror(stdin))
            fputs("error reading stdin\n", stderr);
        if (ferror(stdout))
            fputs("error writing stdout\n", stderr);
        break;
    case Z_STREAM_ERROR:
        fputs("invalid compression level\n", stderr);
        break;
    case Z_DATA_ERROR:
        fputs("invalid or incomplete deflate data\n", stderr);
        break;
    case Z_MEM_ERROR:
        fputs("out of memory\n", stderr);
        break;
    case Z_VERSION_ERROR:
        fputs("zlib version mismatch!\n", stderr);
    }
}

/* compress or decompress from stdin to stdout */
int main(int argc, char **argv)
{
    int ret;

    /* avoid end-of-line conversions */
    SET_BINARY_MODE(stdin);
    SET_BINARY_MODE(stdout);

    /* do compression if no arguments */
    if (argc == 1) {
        ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION);
        if (ret != Z_OK)
            zerr(ret);
        return ret;
    }

    /* do decompression if -d specified */
    else if (argc == 2 && strcmp(argv[1], "-d") == 0) {
        ret = inf(stdin, stdout);
        if (ret != Z_OK)
            zerr(ret);
        return ret;
    }

    /* otherwise, report usage */
    else {
        fputs("zpipe usage: zpipe [-d] < source > dest\n", stderr);
        return 1;
    }
}
Revision:	1096
Committed:	Sat Dec 30 14:40:33 2017 UTC (7 years, 10 months ago) by s10k
Content type:	text/x-csrc
File size:	6323 byte(s)
Log Message:	Added zlib, quazip, basicxmlsyntaxhighlighter, conditionalsemaphore and linenumberdisplay libraries. zlib and quazip are pre-compiled, but you can compile them yourself, just delete the dll files (or equivalent binary files to your OS)
#	Content
1	/* zpipe.c: example of proper use of zlib's inflate() and deflate()
2	Not copyrighted -- provided to the public domain
3	Version 1.4 11 December 2005 Mark Adler */
4
5	/* Version history:
6	1.0 30 Oct 2004 First version
7	1.1 8 Nov 2004 Add void casting for unused return values
8	Use switch statement for inflate() return values
9	1.2 9 Nov 2004 Add assertions to document zlib guarantees
10	1.3 6 Apr 2005 Remove incorrect assertion in inf()
11	1.4 11 Dec 2005 Add hack to avoid MSDOS end-of-line conversions
12	Avoid some compiler warnings for input and output buffers
13	*/
14
15	#include <stdio.h>
16	#include <string.h>
17	#include <assert.h>
18	#include "zlib.h"
19
20	#if defined(MSDOS) \|\| defined(OS2) \|\| defined(WIN32) \|\| defined(__CYGWIN__)
21	# include <fcntl.h>
22	# include <io.h>
23	# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
24	#else
25	# define SET_BINARY_MODE(file)
26	#endif
27
28	#define CHUNK 16384
29
30	/* Compress from file source to file dest until EOF on source.
31	def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
32	allocated for processing, Z_STREAM_ERROR if an invalid compression
33	level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
34	version of the library linked do not match, or Z_ERRNO if there is
35	an error reading or writing the files. */
36	int def(FILE source, FILE dest, int level)
37	{
38	int ret, flush;
39	unsigned have;
40	z_stream strm;
41	unsigned char in[CHUNK];
42	unsigned char out[CHUNK];
43
44	/* allocate deflate state */
45	strm.zalloc = Z_NULL;
46	strm.zfree = Z_NULL;
47	strm.opaque = Z_NULL;
48	ret = deflateInit(&strm, level);
49	if (ret != Z_OK)
50	return ret;
51
52	/* compress until end of file */
53	do {
54	strm.avail_in = fread(in, 1, CHUNK, source);
55	if (ferror(source)) {
56	(void)deflateEnd(&strm);
57	return Z_ERRNO;
58	}
59	flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
60	strm.next_in = in;
61
62	/* run deflate() on input until output buffer not full, finish
63	compression if all of source has been read in */
64	do {
65	strm.avail_out = CHUNK;
66	strm.next_out = out;
67	ret = deflate(&strm, flush); /* no bad return value */
68	assert(ret != Z_STREAM_ERROR); /* state not clobbered */
69	have = CHUNK - strm.avail_out;
70	if (fwrite(out, 1, have, dest) != have \|\| ferror(dest)) {
71	(void)deflateEnd(&strm);
72	return Z_ERRNO;
73	}
74	} while (strm.avail_out == 0);
75	assert(strm.avail_in == 0); /* all input will be used */
76
77	/* done when last data in file processed */
78	} while (flush != Z_FINISH);
79	assert(ret == Z_STREAM_END); /* stream will be complete */
80
81	/* clean up and return */
82	(void)deflateEnd(&strm);
83	return Z_OK;
84	}
85
86	/* Decompress from file source to file dest until stream ends or EOF.
87	inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
88	allocated for processing, Z_DATA_ERROR if the deflate data is
89	invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
90	the version of the library linked do not match, or Z_ERRNO if there
91	is an error reading or writing the files. */
92	int inf(FILE source, FILE dest)
93	{
94	int ret;
95	unsigned have;
96	z_stream strm;
97	unsigned char in[CHUNK];
98	unsigned char out[CHUNK];
99
100	/* allocate inflate state */
101	strm.zalloc = Z_NULL;
102	strm.zfree = Z_NULL;
103	strm.opaque = Z_NULL;
104	strm.avail_in = 0;
105	strm.next_in = Z_NULL;
106	ret = inflateInit(&strm);
107	if (ret != Z_OK)
108	return ret;
109
110	/* decompress until deflate stream ends or end of file */
111	do {
112	strm.avail_in = fread(in, 1, CHUNK, source);
113	if (ferror(source)) {
114	(void)inflateEnd(&strm);
115	return Z_ERRNO;
116	}
117	if (strm.avail_in == 0)
118	break;
119	strm.next_in = in;
120
121	/* run inflate() on input until output buffer not full */
122	do {
123	strm.avail_out = CHUNK;
124	strm.next_out = out;
125	ret = inflate(&strm, Z_NO_FLUSH);
126	assert(ret != Z_STREAM_ERROR); /* state not clobbered */
127	switch (ret) {
128	case Z_NEED_DICT:
129	ret = Z_DATA_ERROR; /* and fall through */
130	case Z_DATA_ERROR:
131	case Z_MEM_ERROR:
132	(void)inflateEnd(&strm);
133	return ret;
134	}
135	have = CHUNK - strm.avail_out;
136	if (fwrite(out, 1, have, dest) != have \|\| ferror(dest)) {
137	(void)inflateEnd(&strm);
138	return Z_ERRNO;
139	}
140	} while (strm.avail_out == 0);
141
142	/* done when inflate() says it's done */
143	} while (ret != Z_STREAM_END);
144
145	/* clean up and return */
146	(void)inflateEnd(&strm);
147	return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
148	}
149
150	/* report a zlib or i/o error */
151	void zerr(int ret)
152	{
153	fputs("zpipe: ", stderr);
154	switch (ret) {
155	case Z_ERRNO:
156	if (ferror(stdin))
157	fputs("error reading stdin\n", stderr);
158	if (ferror(stdout))
159	fputs("error writing stdout\n", stderr);
160	break;
161	case Z_STREAM_ERROR:
162	fputs("invalid compression level\n", stderr);
163	break;
164	case Z_DATA_ERROR:
165	fputs("invalid or incomplete deflate data\n", stderr);
166	break;
167	case Z_MEM_ERROR:
168	fputs("out of memory\n", stderr);
169	break;
170	case Z_VERSION_ERROR:
171	fputs("zlib version mismatch!\n", stderr);
172	}
173	}
174
175	/* compress or decompress from stdin to stdout */
176	int main(int argc, char **argv)
177	{
178	int ret;
179
180	/* avoid end-of-line conversions */
181	SET_BINARY_MODE(stdin);
182	SET_BINARY_MODE(stdout);
183
184	/* do compression if no arguments */
185	if (argc == 1) {
186	ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION);
187	if (ret != Z_OK)
188	zerr(ret);
189	return ret;
190	}
191
192	/* do decompression if -d specified */
193	else if (argc == 2 && strcmp(argv[1], "-d") == 0) {
194	ret = inf(stdin, stdout);
195	if (ret != Z_OK)
196	zerr(ret);
197	return ret;
198	}
199
200	/* otherwise, report usage */
201	else {
202	fputs("zpipe usage: zpipe [-d] < source > dest\n", stderr);
203	return 1;
204	}
205	}