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Zlib ng
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KimLS
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/* minigzip.c -- simulate gzip using the zlib compression library
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* Copyright (C) 1995-2006, 2010, 2011, 2016 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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/*
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* minigzip is a minimal implementation of the gzip utility. This is
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* only an example of using zlib and isn't meant to replace the
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* full-featured gzip. No attempt is made to deal with file systems
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* limiting names to 14 or 8+3 characters, etc... Error checking is
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* very limited. So use minigzip only for testing; use gzip for the
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* real thing.
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*/
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/* @(#) $Id$ */
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#define _POSIX_SOURCE 1 /* This file needs POSIX for fdopen(). */
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#define _POSIX_C_SOURCE 200112 /* For snprintf(). */
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#include "zbuild.h"
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#ifdef ZLIB_COMPAT
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# include "zlib.h"
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#else
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# include "zlib-ng.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef USE_MMAP
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# include <sys/types.h>
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# include <sys/mman.h>
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# include <sys/stat.h>
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#endif
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#ifndef UNALIGNED_OK
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# include <malloc.h>
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#endif
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#if defined(WIN32) || defined(__CYGWIN__)
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# include <fcntl.h>
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# include <io.h>
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# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
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#else
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# define SET_BINARY_MODE(file)
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#endif
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#if defined(_MSC_VER) && _MSC_VER < 1900
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# define snprintf _snprintf
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#endif
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#if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE)
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#ifndef WIN32 /* unlink already in stdio.h for WIN32 */
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extern int unlink (const char *);
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#endif
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#endif
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#ifndef GZ_SUFFIX
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# define GZ_SUFFIX ".gz"
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#endif
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#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
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#if defined(S390_DFLTCC_DEFLATE) || defined(S390_DFLTCC_INFLATE)
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#define BUFLEN 262144 /* DFLTCC works faster with larger buffers */
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#else
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#define BUFLEN 16384 /* read buffer size */
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#endif
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#define BUFLENW (BUFLEN * 3) /* write buffer size */
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#define MAX_NAME_LEN 1024
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static char *prog;
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void error (const char *msg);
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void gz_compress (FILE *in, gzFile out);
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#ifdef USE_MMAP
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int gz_compress_mmap (FILE *in, gzFile out);
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#endif
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void gz_uncompress (gzFile in, FILE *out);
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void file_compress (char *file, char *mode);
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void file_uncompress (char *file);
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int main (int argc, char *argv[]);
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/* ===========================================================================
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* Display error message and exit
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*/
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void error(const char *msg)
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{
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fprintf(stderr, "%s: %s\n", prog, msg);
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exit(1);
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}
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/* ===========================================================================
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* Compress input to output then close both files.
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*/
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void gz_compress(FILE *in, gzFile out)
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{
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char buf[BUFLEN];
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int len;
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int err;
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#ifdef USE_MMAP
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/* Try first compressing with mmap. If mmap fails (minigzip used in a
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* pipe), use the normal fread loop.
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*/
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if (gz_compress_mmap(in, out) == Z_OK) return;
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#endif
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/* Clear out the contents of buf before reading from the file to avoid
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MemorySanitizer: use-of-uninitialized-value warnings. */
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memset(buf, 0, sizeof(buf));
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for (;;) {
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len = (int)fread(buf, 1, sizeof(buf), in);
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if (ferror(in)) {
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perror("fread");
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exit(1);
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}
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if (len == 0) break;
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if (PREFIX(gzwrite)(out, buf, (unsigned)len) != len) error(PREFIX(gzerror)(out, &err));
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}
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fclose(in);
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if (PREFIX(gzclose)(out) != Z_OK) error("failed gzclose");
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}
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#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
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/* Try compressing the input file at once using mmap. Return Z_OK if
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* if success, Z_ERRNO otherwise.
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*/
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int gz_compress_mmap(FILE *in, gzFile out)
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{
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int len;
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int err;
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int ifd = fileno(in);
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caddr_t buf; /* mmap'ed buffer for the entire input file */
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off_t buf_len; /* length of the input file */
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struct stat sb;
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/* Determine the size of the file, needed for mmap: */
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if (fstat(ifd, &sb) < 0) return Z_ERRNO;
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buf_len = sb.st_size;
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if (buf_len <= 0) return Z_ERRNO;
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/* Now do the actual mmap: */
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buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
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if (buf == (caddr_t)(-1)) return Z_ERRNO;
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/* Compress the whole file at once: */
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len = PREFIX(gzwrite)(out, (char *)buf, (unsigned)buf_len);
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if (len != (int)buf_len) error(PREFIX(gzerror)(out, &err));
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munmap(buf, buf_len);
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fclose(in);
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if (PREFIX(gzclose)(out) != Z_OK) error("failed gzclose");
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return Z_OK;
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}
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#endif /* USE_MMAP */
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/* ===========================================================================
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* Uncompress input to output then close both files.
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*/
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void gz_uncompress(gzFile in, FILE *out)
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{
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char buf[BUFLENW];
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int len;
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int err;
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for (;;) {
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len = PREFIX(gzread)(in, buf, sizeof(buf));
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if (len < 0) error (PREFIX(gzerror)(in, &err));
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if (len == 0) break;
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if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
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error("failed fwrite");
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}
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}
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if (fclose(out)) error("failed fclose");
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if (PREFIX(gzclose)(in) != Z_OK) error("failed gzclose");
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}
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/* ===========================================================================
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* Compress the given file: create a corresponding .gz file and remove the
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* original.
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*/
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void file_compress(char *file, char *mode)
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{
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char outfile[MAX_NAME_LEN];
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FILE *in;
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gzFile out;
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if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) {
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fprintf(stderr, "%s: filename too long\n", prog);
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exit(1);
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}
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snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX);
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in = fopen(file, "rb");
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if (in == NULL) {
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perror(file);
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exit(1);
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}
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out = PREFIX(gzopen)(outfile, mode);
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if (out == NULL) {
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fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
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exit(1);
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}
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gz_compress(in, out);
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unlink(file);
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}
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/* ===========================================================================
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* Uncompress the given file and remove the original.
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*/
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void file_uncompress(char *file)
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{
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char buf[MAX_NAME_LEN];
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char *infile, *outfile;
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FILE *out;
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gzFile in;
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size_t len = strlen(file);
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if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) {
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fprintf(stderr, "%s: filename too long\n", prog);
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exit(1);
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}
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snprintf(buf, sizeof(buf), "%s", file);
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if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {
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infile = file;
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outfile = buf;
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outfile[len-3] = '\0';
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} else {
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outfile = file;
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infile = buf;
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snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX);
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}
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in = PREFIX(gzopen)(infile, "rb");
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if (in == NULL) {
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fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);
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exit(1);
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}
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out = fopen(outfile, "wb");
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if (out == NULL) {
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perror(file);
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exit(1);
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}
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gz_uncompress(in, out);
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unlink(infile);
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}
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/* ===========================================================================
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* Usage: minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...]
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* -c : write to standard output
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* -d : decompress
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* -f : compress with Z_FILTERED
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* -h : compress with Z_HUFFMAN_ONLY
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* -r : compress with Z_RLE
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* -0 to -9 : compression level
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*/
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int main(int argc, char *argv[])
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{
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int copyout = 0;
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int uncompr = 0;
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gzFile file;
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char *bname, outmode[20];
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snprintf(outmode, sizeof(outmode), "%s", "wb6 ");
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prog = argv[0];
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bname = strrchr(argv[0], '/');
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if (bname)
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bname++;
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else
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bname = argv[0];
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argc--, argv++;
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if (!strcmp(bname, "gunzip"))
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uncompr = 1;
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else if (!strcmp(bname, "zcat"))
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copyout = uncompr = 1;
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while (argc > 0) {
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if (strcmp(*argv, "-c") == 0)
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copyout = 1;
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else if (strcmp(*argv, "-d") == 0)
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uncompr = 1;
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else if (strcmp(*argv, "-f") == 0)
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outmode[3] = 'f';
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else if (strcmp(*argv, "-h") == 0)
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outmode[3] = 'h';
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else if (strcmp(*argv, "-r") == 0)
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outmode[3] = 'R';
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else if ((*argv)[0] == '-' && (*argv)[1] >= '0' && (*argv)[1] <= '9' &&
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(*argv)[2] == 0)
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outmode[2] = (*argv)[1];
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else
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break;
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argc--, argv++;
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}
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if (outmode[3] == ' ')
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outmode[3] = 0;
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if (argc == 0) {
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SET_BINARY_MODE(stdin);
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SET_BINARY_MODE(stdout);
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if (uncompr) {
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file = PREFIX(gzdopen)(fileno(stdin), "rb");
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if (file == NULL) error("can't gzdopen stdin");
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gz_uncompress(file, stdout);
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} else {
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file = PREFIX(gzdopen)(fileno(stdout), outmode);
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if (file == NULL) error("can't gzdopen stdout");
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gz_compress(stdin, file);
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}
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} else {
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if (copyout) {
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SET_BINARY_MODE(stdout);
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}
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do {
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if (uncompr) {
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if (copyout) {
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file = PREFIX(gzopen)(*argv, "rb");
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if (file == NULL)
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fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv);
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else
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gz_uncompress(file, stdout);
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} else {
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file_uncompress(*argv);
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}
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} else {
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if (copyout) {
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FILE * in = fopen(*argv, "rb");
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if (in == NULL) {
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perror(*argv);
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} else {
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file = PREFIX(gzdopen)(fileno(stdout), outmode);
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if (file == NULL) error("can't gzdopen stdout");
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gz_compress(in, file);
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}
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} else {
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file_compress(*argv, outmode);
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}
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}
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} while (argv++, --argc);
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}
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return 0;
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}
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