+++ /dev/null
-/* zpipe.c: example of proper use of zlib's inflate() and deflate()
- Not copyrighted -- provided to the public domain
- Version 1.2 9 November 2004 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()
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <assert.h>
-#include "zlib.h"
-
-#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;
- char in[CHUNK];
- 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;
- char in[CHUNK];
- 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;
-
- /* 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;
- }
-}
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