diff options
Diffstat (limited to 'example.c')
| -rw-r--r-- | example.c | 58 |
1 files changed, 38 insertions, 20 deletions
@@ -1,9 +1,9 @@ /* example.c -- usage example of the zlib compression library - * Copyright (C) 1995-1996 Jean-loup Gailly. + * Copyright (C) 1995-1998 Jean-loup Gailly. * For conditions of distribution and use, see copyright notice in zlib.h */ -/* $Id: example.c,v 1.16 1996/05/23 17:11:28 me Exp $ */ +/* @(#) $Id$ */ #include <stdio.h> #include "zlib.h" @@ -86,16 +86,17 @@ void test_gzio(out, in, uncompr, uncomprLen) int err; int len = strlen(hello)+1; gzFile file; + z_off_t pos; file = gzopen(out, "wb"); if (file == NULL) { fprintf(stderr, "gzopen error\n"); exit(1); } - - if (gzwrite(file, (const voidp)hello, (unsigned)len) != len) { - fprintf(stderr, "gzwrite err: %s\n", gzerror(file, &err)); + if (gzprintf(file, "%s, %s!", "hello", "hello") != len-1) { + fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err)); } + gzseek(file, 1L, SEEK_CUR); /* add one zero byte */ gzclose(file); file = gzopen(in, "rb"); @@ -108,13 +109,28 @@ void test_gzio(out, in, uncompr, uncomprLen) if (uncomprLen != len) { fprintf(stderr, "gzread err: %s\n", gzerror(file, &err)); } - gzclose(file); - if (strcmp((char*)uncompr, hello)) { fprintf(stderr, "bad gzread\n"); } else { printf("gzread(): %s\n", uncompr); } + + pos = gzseek(file, -7L, SEEK_CUR); + if (pos != 7 || gztell(file) != pos) { + fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n", + pos, gztell(file)); + } + uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen); + if (uncomprLen != 7) { + fprintf(stderr, "gzread err after gzseek: %s\n", gzerror(file, &err)); + } + if (strcmp((char*)uncompr, hello+7)) { + fprintf(stderr, "bad gzread after gzseek\n"); + } else { + printf("gzread() after gzseek: %s\n", uncompr); + } + + gzclose(file); } /* =========================================================================== @@ -171,12 +187,13 @@ void test_inflate(compr, comprLen, uncompr, uncomprLen) d_stream.zfree = (free_func)0; d_stream.opaque = (voidpf)0; - err = inflateInit(&d_stream); - CHECK_ERR(err, "inflateInit"); - d_stream.next_in = compr; + d_stream.avail_in = 0; d_stream.next_out = uncompr; + err = inflateInit(&d_stream); + CHECK_ERR(err, "inflateInit"); + while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) { d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */ err = inflate(&d_stream, Z_NO_FLUSH); @@ -263,12 +280,12 @@ void test_large_inflate(compr, comprLen, uncompr, uncomprLen) d_stream.zfree = (free_func)0; d_stream.opaque = (voidpf)0; - err = inflateInit(&d_stream); - CHECK_ERR(err, "inflateInit"); - d_stream.next_in = compr; d_stream.avail_in = (uInt)comprLen; + err = inflateInit(&d_stream); + CHECK_ERR(err, "inflateInit"); + for (;;) { d_stream.next_out = uncompr; /* discard the output */ d_stream.avail_out = (uInt)uncomprLen; @@ -339,12 +356,13 @@ void test_sync(compr, comprLen, uncompr, uncomprLen) d_stream.zfree = (free_func)0; d_stream.opaque = (voidpf)0; + d_stream.next_in = compr; + d_stream.avail_in = 2; /* just read the zlib header */ + err = inflateInit(&d_stream); CHECK_ERR(err, "inflateInit"); - d_stream.next_in = compr; d_stream.next_out = uncompr; - d_stream.avail_in = 2; /* just read the zlib header */ d_stream.avail_out = (uInt)uncomprLen; inflate(&d_stream, Z_NO_FLUSH); @@ -417,12 +435,12 @@ void test_dict_inflate(compr, comprLen, uncompr, uncomprLen) d_stream.zfree = (free_func)0; d_stream.opaque = (voidpf)0; - err = inflateInit(&d_stream); - CHECK_ERR(err, "inflateInit"); - d_stream.next_in = compr; d_stream.avail_in = (uInt)comprLen; + err = inflateInit(&d_stream); + CHECK_ERR(err, "inflateInit"); + d_stream.next_out = uncompr; d_stream.avail_out = (uInt)uncomprLen; @@ -461,8 +479,9 @@ int main(argc, argv) Byte *compr, *uncompr; uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */ uLong uncomprLen = comprLen; + static const char* myVersion = ZLIB_VERSION; - if (zlibVersion()[0] != ZLIB_VERSION[0]) { + if (zlibVersion()[0] != myVersion[0]) { fprintf(stderr, "incompatible zlib version\n"); exit(1); @@ -479,7 +498,6 @@ int main(argc, argv) printf("out of memory\n"); exit(1); } - test_compress(compr, comprLen, uncompr, uncomprLen); test_gzio((argc > 1 ? argv[1] : "foo.gz"), |