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/* example.c -- usage example of the zlib compression library |
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* Copyright (C) 1995-2026 Jean-loup Gailly |
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* For conditions of distribution and use, see copyright notice in zlib.h |
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*/ |
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/* @(#) $Id$ */ |
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#if defined(_WIN32) && !defined(_CRT_SECURE_NO_WARNINGS) |
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# define _CRT_SECURE_NO_WARNINGS |
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#endif |
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#include "zlib.h" |
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#include <stdio.h> |
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#ifdef STDC |
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# include <string.h> |
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# include <stdlib.h> |
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#endif |
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#if defined(VMS) |
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# define TESTFILE "foo-gz" |
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#elif defined(__riscos) && !defined(__TARGET_UNIXLIB__) |
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# define TESTFILE "foo/gz" |
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#else |
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# define TESTFILE "foo.gz" |
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#endif |
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#define CHECK_ERR(err, msg) { \ |
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if (err != Z_OK) { \ |
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fprintf(stderr, "%s error: %d\n", msg, err); \ |
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exit(1); \ |
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} \ |
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} |
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static z_const char hello[] = "hello, hello!"; |
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/* "hello world" would be more standard, but the repeated "hello" |
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* stresses the compression code better, sorry... |
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*/ |
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static const char dictionary[] = "hello"; |
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static uLong dictId; /* Adler32 value of the dictionary */ |
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#ifdef Z_SOLO |
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static void *myalloc(void *q, unsigned n, unsigned m) { |
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(void)q; |
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return calloc(n, m); |
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} |
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static void myfree(void *q, void *p) { |
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(void)q; |
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free(p); |
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} |
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static alloc_func zalloc = myalloc; |
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static free_func zfree = myfree; |
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#else /* !Z_SOLO */ |
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static alloc_func zalloc = (alloc_func)0; |
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static free_func zfree = (free_func)0; |
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/* =========================================================================== |
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* Test compress() and uncompress() |
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*/ |
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static void test_compress(Byte *compr, uLong comprLen, Byte *uncompr, |
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uLong uncomprLen) { |
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int err; |
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uLong len = (uLong)strlen(hello)+1; |
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err = compress(compr, &comprLen, (const Bytef*)hello, len); |
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CHECK_ERR(err, "compress"); |
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strcpy((char*)uncompr, "garbage"); |
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err = uncompress(uncompr, &uncomprLen, compr, comprLen); |
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CHECK_ERR(err, "uncompress"); |
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if (strcmp((char*)uncompr, hello)) { |
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fprintf(stderr, "bad uncompress\n"); |
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exit(1); |
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} else { |
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printf("uncompress(): %s\n", (char *)uncompr); |
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} |
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} |
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/* =========================================================================== |
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* Test read/write of .gz files |
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*/ |
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static void test_gzio(const char *fname, Byte *uncompr, uLong uncomprLen) { |
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#ifdef NO_GZCOMPRESS |
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fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n"); |
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#else |
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int err; |
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int len = (int)strlen(hello)+1; |
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gzFile file; |
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z_off_t pos; |
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file = gzopen(fname, "wb"); |
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if (file == NULL) { |
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fprintf(stderr, "gzopen error\n"); |
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exit(1); |
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} |
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gzputc(file, 'h'); |
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if (gzputs(file, "ello") != 4) { |
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fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err)); |
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exit(1); |
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} |
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if (gzprintf(file, ", %s!", "hello") != 8) { |
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fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err)); |
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exit(1); |
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} |
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gzseek(file, 1L, SEEK_CUR); /* add one zero byte */ |
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gzclose(file); |
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file = gzopen(fname, "rb"); |
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if (file == NULL) { |
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fprintf(stderr, "gzopen error\n"); |
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exit(1); |
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} |
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strcpy((char*)uncompr, "garbage"); |
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if (gzread(file, uncompr, (unsigned)uncomprLen) != len) { |
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fprintf(stderr, "gzread err: %s\n", gzerror(file, &err)); |
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exit(1); |
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} |
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if (strcmp((char*)uncompr, hello)) { |
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fprintf(stderr, "bad gzread: %s\n", (char*)uncompr); |
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exit(1); |
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} else { |
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printf("gzread(): %s\n", (char*)uncompr); |
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} |
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pos = gzseek(file, -8L, SEEK_CUR); |
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if (pos != 6 || gztell(file) != pos) { |
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fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n", |
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(long)pos, (long)gztell(file)); |
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exit(1); |
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} |
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if (gzgetc(file) != ' ') { |
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fprintf(stderr, "gzgetc error\n"); |
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exit(1); |
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} |
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if (gzungetc(' ', file) != ' ') { |
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fprintf(stderr, "gzungetc error\n"); |
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exit(1); |
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} |
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gzgets(file, (char*)uncompr, (int)uncomprLen); |
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if (strlen((char*)uncompr) != 7) { /* " hello!" */ |
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fprintf(stderr, "gzgets err after gzseek: %s\n", gzerror(file, &err)); |
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exit(1); |
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} |
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if (strcmp((char*)uncompr, hello + 6)) { |
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fprintf(stderr, "bad gzgets after gzseek\n"); |
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exit(1); |
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} else { |
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printf("gzgets() after gzseek: %s\n", (char*)uncompr); |
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} |
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gzclose(file); |
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#endif |
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} |
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#endif /* Z_SOLO */ |
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/* =========================================================================== |
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* Test deflate() with small buffers |
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*/ |
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static void test_deflate(Byte *compr, uLong comprLen) { |
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z_stream c_stream; /* compression stream */ |
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int err; |
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uLong len = (uLong)strlen(hello)+1; |
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c_stream.zalloc = zalloc; |
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c_stream.zfree = zfree; |
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c_stream.opaque = (voidpf)0; |
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err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION); |
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CHECK_ERR(err, "deflateInit"); |
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c_stream.next_in = (z_const unsigned char *)hello; |
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c_stream.next_out = compr; |
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while (c_stream.total_in != len && c_stream.total_out < comprLen) { |
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c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */ |
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err = deflate(&c_stream, Z_NO_FLUSH); |
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CHECK_ERR(err, "deflate"); |
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} |
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/* Finish the stream, still forcing small buffers: */ |
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for (;;) { |
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c_stream.avail_out = 1; |
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err = deflate(&c_stream, Z_FINISH); |
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if (err == Z_STREAM_END) break; |
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CHECK_ERR(err, "deflate"); |
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} |
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err = deflateEnd(&c_stream); |
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CHECK_ERR(err, "deflateEnd"); |
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} |
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/* =========================================================================== |
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* Test inflate() with small buffers |
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*/ |
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static void test_inflate(Byte *compr, uLong comprLen, Byte *uncompr, |
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uLong uncomprLen) { |
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int err; |
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z_stream d_stream; /* decompression stream */ |
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strcpy((char*)uncompr, "garbage"); |
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d_stream.zalloc = zalloc; |
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d_stream.zfree = zfree; |
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d_stream.opaque = (voidpf)0; |
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d_stream.next_in = compr; |
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d_stream.avail_in = 0; |
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d_stream.next_out = uncompr; |
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err = inflateInit(&d_stream); |
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CHECK_ERR(err, "inflateInit"); |
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while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) { |
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d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */ |
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err = inflate(&d_stream, Z_NO_FLUSH); |
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if (err == Z_STREAM_END) break; |
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CHECK_ERR(err, "inflate"); |
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} |
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err = inflateEnd(&d_stream); |
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CHECK_ERR(err, "inflateEnd"); |
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if (strcmp((char*)uncompr, hello)) { |
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fprintf(stderr, "bad inflate\n"); |
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exit(1); |
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} else { |
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printf("inflate(): %s\n", (char *)uncompr); |
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} |
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} |
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/* =========================================================================== |
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* Test deflate() with large buffers and dynamic change of compression level |
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*/ |
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static void test_large_deflate(Byte *compr, uLong comprLen, Byte *uncompr, |
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uLong uncomprLen) { |
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z_stream c_stream; /* compression stream */ |
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int err; |
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c_stream.zalloc = zalloc; |
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c_stream.zfree = zfree; |
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c_stream.opaque = (voidpf)0; |
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err = deflateInit(&c_stream, Z_BEST_SPEED); |
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CHECK_ERR(err, "deflateInit"); |
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c_stream.next_out = compr; |
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c_stream.avail_out = (uInt)comprLen; |
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/* At this point, uncompr is still mostly zeroes, so it should compress |
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* very well: |
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*/ |
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c_stream.next_in = uncompr; |
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c_stream.avail_in = (uInt)uncomprLen; |
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err = deflate(&c_stream, Z_NO_FLUSH); |
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CHECK_ERR(err, "deflate"); |
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if (c_stream.avail_in != 0) { |
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fprintf(stderr, "deflate not greedy\n"); |
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exit(1); |
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} |
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272
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273
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/* Feed in already compressed data and switch to no compression: */ |
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deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY); |
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c_stream.next_in = compr; |
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c_stream.avail_in = (uInt)uncomprLen/2; |
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err = deflate(&c_stream, Z_NO_FLUSH); |
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CHECK_ERR(err, "deflate"); |
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/* Switch back to compressing mode: */ |
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deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED); |
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c_stream.next_in = uncompr; |
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c_stream.avail_in = (uInt)uncomprLen; |
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err = deflate(&c_stream, Z_NO_FLUSH); |
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CHECK_ERR(err, "deflate"); |
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287
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err = deflate(&c_stream, Z_FINISH); |
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288
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if (err != Z_STREAM_END) { |
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289
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fprintf(stderr, "deflate should report Z_STREAM_END\n"); |
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exit(1); |
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291
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} |
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err = deflateEnd(&c_stream); |
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293
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CHECK_ERR(err, "deflateEnd"); |
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294
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} |
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295
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296
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/* =========================================================================== |
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297
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* Test inflate() with large buffers |
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298
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*/ |
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299
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static void test_large_inflate(Byte *compr, uLong comprLen, Byte *uncompr, |
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uLong uncomprLen) { |
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301
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int err; |
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302
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z_stream d_stream; /* decompression stream */ |
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303
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304
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strcpy((char*)uncompr, "garbage"); |
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305
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306
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d_stream.zalloc = zalloc; |
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307
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d_stream.zfree = zfree; |
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308
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d_stream.opaque = (voidpf)0; |
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309
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310
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d_stream.next_in = compr; |
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311
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d_stream.avail_in = (uInt)comprLen; |
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312
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313
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err = inflateInit(&d_stream); |
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314
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CHECK_ERR(err, "inflateInit"); |
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315
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316
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for (;;) { |
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317
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d_stream.next_out = uncompr; /* discard the output */ |
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318
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d_stream.avail_out = (uInt)uncomprLen; |
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319
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err = inflate(&d_stream, Z_NO_FLUSH); |
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320
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if (err == Z_STREAM_END) break; |
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321
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CHECK_ERR(err, "large inflate"); |
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322
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} |
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323
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324
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err = inflateEnd(&d_stream); |
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325
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CHECK_ERR(err, "inflateEnd"); |
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326
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327
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if (d_stream.total_out != 2*uncomprLen + uncomprLen/2) { |
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328
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fprintf(stderr, "bad large inflate: %lu\n", d_stream.total_out); |
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329
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exit(1); |
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330
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} else { |
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331
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printf("large_inflate(): OK\n"); |
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332
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} |
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333
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} |
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334
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335
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/* =========================================================================== |
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336
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* Test deflate() with full flush |
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337
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*/ |
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338
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static void test_flush(Byte *compr, uLong *comprLen) { |
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339
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z_stream c_stream; /* compression stream */ |
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340
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int err; |
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341
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uInt len = (uInt)strlen(hello)+1; |
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342
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343
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c_stream.zalloc = zalloc; |
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344
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c_stream.zfree = zfree; |
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345
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c_stream.opaque = (voidpf)0; |
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346
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347
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err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION); |
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348
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CHECK_ERR(err, "deflateInit"); |
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349
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350
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c_stream.next_in = (z_const unsigned char *)hello; |
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351
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c_stream.next_out = compr; |
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352
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c_stream.avail_in = 3; |
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353
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c_stream.avail_out = (uInt)*comprLen; |
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354
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err = deflate(&c_stream, Z_FULL_FLUSH); |
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355
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CHECK_ERR(err, "deflate"); |
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356
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357
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compr[3]++; /* force an error in first compressed block */ |
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358
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c_stream.avail_in = len - 3; |
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359
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360
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err = deflate(&c_stream, Z_FINISH); |
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361
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if (err != Z_STREAM_END) { |
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362
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CHECK_ERR(err, "deflate"); |
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363
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} |
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364
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err = deflateEnd(&c_stream); |
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365
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CHECK_ERR(err, "deflateEnd"); |
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366
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|
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367
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*comprLen = c_stream.total_out; |
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368
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} |
|
369
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|
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370
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/* =========================================================================== |
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371
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* Test inflateSync() |
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372
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*/ |
|
373
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static void test_sync(Byte *compr, uLong comprLen, Byte *uncompr, |
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374
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uLong uncomprLen) { |
|
375
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int err; |
|
376
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z_stream d_stream; /* decompression stream */ |
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377
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|
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378
|
strcpy((char*)uncompr, "garbage"); |
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379
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380
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d_stream.zalloc = zalloc; |
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381
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d_stream.zfree = zfree; |
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382
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d_stream.opaque = (voidpf)0; |
|
383
|
|
|
384
|
d_stream.next_in = compr; |
|
385
|
d_stream.avail_in = 2; /* just read the zlib header */ |
|
386
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|
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387
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err = inflateInit(&d_stream); |
|
388
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CHECK_ERR(err, "inflateInit"); |
|
389
|
|
|
390
|
d_stream.next_out = uncompr; |
|
391
|
d_stream.avail_out = (uInt)uncomprLen; |
|
392
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393
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err = inflate(&d_stream, Z_NO_FLUSH); |
|
394
|
CHECK_ERR(err, "inflate"); |
|
395
|
|
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396
|
d_stream.avail_in = (uInt)comprLen-2; /* read all compressed data */ |
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397
|
err = inflateSync(&d_stream); /* but skip the damaged part */ |
|
398
|
CHECK_ERR(err, "inflateSync"); |
|
399
|
|
|
400
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err = inflate(&d_stream, Z_FINISH); |
|
401
|
if (err != Z_STREAM_END) { |
|
402
|
fprintf(stderr, "inflate should report Z_STREAM_END\n"); |
|
403
|
exit(1); |
|
404
|
} |
|
405
|
err = inflateEnd(&d_stream); |
|
406
|
CHECK_ERR(err, "inflateEnd"); |
|
407
|
|
|
408
|
printf("after inflateSync(): hel%s\n", (char *)uncompr); |
|
409
|
} |
|
410
|
|
|
411
|
/* =========================================================================== |
|
412
|
* Test deflate() with preset dictionary |
|
413
|
*/ |
|
414
|
static void test_dict_deflate(Byte *compr, uLong comprLen) { |
|
415
|
z_stream c_stream; /* compression stream */ |
|
416
|
int err; |
|
417
|
|
|
418
|
c_stream.zalloc = zalloc; |
|
419
|
c_stream.zfree = zfree; |
|
420
|
c_stream.opaque = (voidpf)0; |
|
421
|
|
|
422
|
err = deflateInit(&c_stream, Z_BEST_COMPRESSION); |
|
423
|
CHECK_ERR(err, "deflateInit"); |
|
424
|
|
|
425
|
err = deflateSetDictionary(&c_stream, |
|
426
|
(const Bytef*)dictionary, (int)sizeof(dictionary)); |
|
427
|
CHECK_ERR(err, "deflateSetDictionary"); |
|
428
|
|
|
429
|
dictId = c_stream.adler; |
|
430
|
c_stream.next_out = compr; |
|
431
|
c_stream.avail_out = (uInt)comprLen; |
|
432
|
|
|
433
|
c_stream.next_in = (z_const unsigned char *)hello; |
|
434
|
c_stream.avail_in = (uInt)strlen(hello)+1; |
|
435
|
|
|
436
|
err = deflate(&c_stream, Z_FINISH); |
|
437
|
if (err != Z_STREAM_END) { |
|
438
|
fprintf(stderr, "deflate should report Z_STREAM_END\n"); |
|
439
|
exit(1); |
|
440
|
} |
|
441
|
err = deflateEnd(&c_stream); |
|
442
|
CHECK_ERR(err, "deflateEnd"); |
|
443
|
} |
|
444
|
|
|
445
|
/* =========================================================================== |
|
446
|
* Test inflate() with a preset dictionary |
|
447
|
*/ |
|
448
|
static void test_dict_inflate(Byte *compr, uLong comprLen, Byte *uncompr, |
|
449
|
uLong uncomprLen) { |
|
450
|
int err; |
|
451
|
z_stream d_stream; /* decompression stream */ |
|
452
|
|
|
453
|
strcpy((char*)uncompr, "garbage"); |
|
454
|
|
|
455
|
d_stream.zalloc = zalloc; |
|
456
|
d_stream.zfree = zfree; |
|
457
|
d_stream.opaque = (voidpf)0; |
|
458
|
|
|
459
|
d_stream.next_in = compr; |
|
460
|
d_stream.avail_in = (uInt)comprLen; |
|
461
|
|
|
462
|
err = inflateInit(&d_stream); |
|
463
|
CHECK_ERR(err, "inflateInit"); |
|
464
|
|
|
465
|
d_stream.next_out = uncompr; |
|
466
|
d_stream.avail_out = (uInt)uncomprLen; |
|
467
|
|
|
468
|
for (;;) { |
|
469
|
err = inflate(&d_stream, Z_NO_FLUSH); |
|
470
|
if (err == Z_STREAM_END) break; |
|
471
|
if (err == Z_NEED_DICT) { |
|
472
|
if (d_stream.adler != dictId) { |
|
473
|
fprintf(stderr, "unexpected dictionary"); |
|
474
|
exit(1); |
|
475
|
} |
|
476
|
err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary, |
|
477
|
(int)sizeof(dictionary)); |
|
478
|
} |
|
479
|
CHECK_ERR(err, "inflate with dict"); |
|
480
|
} |
|
481
|
|
|
482
|
err = inflateEnd(&d_stream); |
|
483
|
CHECK_ERR(err, "inflateEnd"); |
|
484
|
|
|
485
|
if (strcmp((char*)uncompr, hello)) { |
|
486
|
fprintf(stderr, "bad inflate with dict\n"); |
|
487
|
exit(1); |
|
488
|
} else { |
|
489
|
printf("inflate with dictionary: %s\n", (char *)uncompr); |
|
490
|
} |
|
491
|
} |
|
492
|
|
|
493
|
/* =========================================================================== |
|
494
|
* Usage: example [output.gz [input.gz]] |
|
495
|
*/ |
|
496
|
|
|
497
|
int main(int argc, char *argv[]) { |
|
498
|
Byte *compr, *uncompr; |
|
499
|
uLong uncomprLen = 20000; |
|
500
|
uLong comprLen = 3 * uncomprLen; |
|
501
|
static const char* myVersion = ZLIB_VERSION; |
|
502
|
|
|
503
|
if (zlibVersion()[0] != myVersion[0]) { |
|
504
|
fprintf(stderr, "incompatible zlib version\n"); |
|
505
|
exit(1); |
|
506
|
|
|
507
|
} else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) { |
|
508
|
fprintf(stderr, "warning: different zlib version linked: %s\n", |
|
509
|
zlibVersion()); |
|
510
|
} |
|
511
|
|
|
512
|
printf("zlib version %s = 0x%04x, compile flags = 0x%lx\n", |
|
513
|
ZLIB_VERSION, (unsigned)ZLIB_VERNUM, zlibCompileFlags()); |
|
514
|
|
|
515
|
compr = (Byte*)calloc((uInt)comprLen, 1); |
|
516
|
uncompr = (Byte*)calloc((uInt)uncomprLen, 1); |
|
517
|
/* compr and uncompr are cleared to avoid reading uninitialized |
|
518
|
* data and to ensure that uncompr compresses well. |
|
519
|
*/ |
|
520
|
if (compr == Z_NULL || uncompr == Z_NULL) { |
|
521
|
printf("out of memory\n"); |
|
522
|
exit(1); |
|
523
|
} |
|
524
|
|
|
525
|
#ifdef Z_SOLO |
|
526
|
(void)argc; |
|
527
|
(void)argv; |
|
528
|
#else |
|
529
|
test_compress(compr, comprLen, uncompr, uncomprLen); |
|
530
|
|
|
531
|
test_gzio((argc > 1 ? argv[1] : TESTFILE), |
|
532
|
uncompr, uncomprLen); |
|
533
|
#endif |
|
534
|
|
|
535
|
test_deflate(compr, comprLen); |
|
536
|
test_inflate(compr, comprLen, uncompr, uncomprLen); |
|
537
|
|
|
538
|
test_large_deflate(compr, comprLen, uncompr, uncomprLen); |
|
539
|
test_large_inflate(compr, comprLen, uncompr, uncomprLen); |
|
540
|
|
|
541
|
test_flush(compr, &comprLen); |
|
542
|
test_sync(compr, comprLen, uncompr, uncomprLen); |
|
543
|
comprLen = 3 * uncomprLen; |
|
544
|
|
|
545
|
test_dict_deflate(compr, comprLen); |
|
546
|
test_dict_inflate(compr, comprLen, uncompr, uncomprLen); |
|
547
|
|
|
548
|
free(compr); |
|
549
|
free(uncompr); |
|
550
|
|
|
551
|
return 0; |
|
552
|
} |
|
553
|
|