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/* minigzip.c -- simulate gzip using the zlib compression library
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* Copyright (C) 1995-2006, 2010, 2011 Jean-loup Gailly.
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* For conditions of distribution and use, see copyright notice in zlib.h
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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. On MSDOS, use only on file names without extension
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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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#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
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# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
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# define SET_BINARY_MODE(file)
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# define unlink delete
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# define GZ_SUFFIX "-gz"
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# define unlink remove
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# define GZ_SUFFIX "-gz"
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# define fileno(file) file->__file
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#if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
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# include <unix.h> /* for fileno */
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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 OF((const char *));
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# define perror(s) pwinerror(s)
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/* Map the Windows error number in ERROR to a locale-dependent error
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message string and return a pointer to it. Typically, the values
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for ERROR come from GetLastError.
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The string pointed to shall not be modified by the application,
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but may be overwritten by a subsequent call to strwinerror
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The strwinerror function does not change the current setting
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static char *strwinerror (error)
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static char buf[1024];
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DWORD lasterr = GetLastError();
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DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
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| FORMAT_MESSAGE_ALLOCATE_BUFFER,
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0, /* Default language */
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/* If there is an \r\n appended, zap it. */
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&& msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {
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if (chars > sizeof (buf) - 1) {
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chars = sizeof (buf) - 1;
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wcstombs(buf, msgbuf, chars + 1);
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sprintf(buf, "unknown win32 error (%ld)", error);
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SetLastError(lasterr);
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static void pwinerror (s)
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fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ()));
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fprintf(stderr, "%s\n", strwinerror(GetLastError ()));
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#endif /* UNDER_CE */
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# define GZ_SUFFIX ".gz"
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#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
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#define MAX_NAME_LEN 1024
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# define local static
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/* Needed for systems with limitation on stack size. */
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/* for Z_SOLO, create simplified gz* functions using deflate and inflate */
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#if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE)
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# include <unistd.h> /* for unlink() */
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void *myalloc OF((void *, unsigned, unsigned));
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void myfree OF((void *, void *));
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void *myalloc(q, n, m)
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typedef struct gzFile_s {
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gzFile gzopen OF((const char *, const char *));
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gzFile gzdopen OF((int, const char *));
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gzFile gz_open OF((const char *, int, const char *));
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gzFile gzopen(path, mode)
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return gz_open(path, -1, mode);
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gzFile gzdopen(fd, mode)
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return gz_open(NULL, fd, mode);
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gzFile gz_open(path, fd, mode)
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gz = malloc(sizeof(gzFile));
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gz->write = strchr(mode, 'w') != NULL;
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gz->strm.zalloc = myalloc;
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gz->strm.zfree = myfree;
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gz->strm.opaque = Z_NULL;
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ret = deflateInit2(&(gz->strm), -1, 8, 15 + 16, 8, 0);
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gz->strm.next_in = 0;
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gz->strm.avail_in = Z_NULL;
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ret = inflateInit2(&(gz->strm), 15 + 16);
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gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") :
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fopen(path, gz->write ? "wb" : "rb");
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if (gz->file == NULL) {
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gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm));
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int gzwrite OF((gzFile, const void *, unsigned));
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int gzwrite(gz, buf, len)
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unsigned char out[BUFLEN];
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if (gz == NULL || !gz->write)
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strm->next_in = (void *)buf;
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strm->avail_in = len;
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strm->next_out = out;
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strm->avail_out = BUFLEN;
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(void)deflate(strm, Z_NO_FLUSH);
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fwrite(out, 1, BUFLEN - strm->avail_out, gz->file);
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} while (strm->avail_out == 0);
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int gzread OF((gzFile, void *, unsigned));
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int gzread(gz, buf, len)
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if (gz == NULL || gz->write)
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strm->next_out = (void *)buf;
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strm->avail_out = len;
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got = fread(in, 1, 1, gz->file);
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ret = inflate(strm, Z_NO_FLUSH);
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if (ret == Z_DATA_ERROR) {
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gz->err = Z_DATA_ERROR;
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if (ret == Z_STREAM_END)
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} while (strm->avail_out);
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return len - strm->avail_out;
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int gzclose OF((gzFile));
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unsigned char out[BUFLEN];
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return Z_STREAM_ERROR;
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strm->next_in = Z_NULL;
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strm->next_out = out;
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strm->avail_out = BUFLEN;
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(void)deflate(strm, Z_FINISH);
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fwrite(out, 1, BUFLEN - strm->avail_out, gz->file);
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} while (strm->avail_out == 0);
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const char *gzerror OF((gzFile, int *));
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const char *gzerror(gz, err)
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void error OF((const char *msg));
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void gz_compress OF((FILE *in, gzFile out));
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int gz_compress_mmap OF((FILE *in, gzFile out));
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void gz_uncompress OF((gzFile in, FILE *out));
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void file_compress OF((char *file, char *mode));
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void file_uncompress OF((char *file));
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int main OF((int argc, char *argv[]));
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/* ===========================================================================
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* Display error message and exit
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fprintf(stderr, "%s: %s\n", prog, msg);
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/* ===========================================================================
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* Compress input to output then close both files.
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void gz_compress(in, out)
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local char buf[BUFLEN];
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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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if (gz_compress_mmap(in, out) == Z_OK) return;
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len = (int)fread(buf, 1, sizeof(buf), in);
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if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));
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if (gzclose(out) != Z_OK) error("failed gzclose");
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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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int gz_compress_mmap(in, out)
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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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/* 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 = gzwrite(out, (char *)buf, (unsigned)buf_len);
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if (len != (int)buf_len) error(gzerror(out, &err));
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munmap(buf, buf_len);
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if (gzclose(out) != Z_OK) error("failed gzclose");
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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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void gz_uncompress(in, out)
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local char buf[BUFLEN];
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len = gzread(in, buf, sizeof(buf));
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if (len < 0) error (gzerror(in, &err));
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if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
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error("failed fwrite");
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if (fclose(out)) error("failed fclose");
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if (gzclose(in) != Z_OK) error("failed gzclose");
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/* ===========================================================================
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* Compress the given file: create a corresponding .gz file and remove the
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void file_compress(file, mode)
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local char outfile[MAX_NAME_LEN];
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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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strcpy(outfile, file);
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strcat(outfile, GZ_SUFFIX);
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in = fopen(file, "rb");
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out = gzopen(outfile, mode);
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fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
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gz_compress(in, out);
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/* ===========================================================================
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* Uncompress the given file and remove the original.
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void file_uncompress(file)
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local char buf[MAX_NAME_LEN];
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char *infile, *outfile;
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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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if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {
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outfile[len-3] = '\0';
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strcat(infile, GZ_SUFFIX);
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in = gzopen(infile, "rb");
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fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);
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out = fopen(outfile, "wb");
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gz_uncompress(in, out);
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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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* -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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* -1 to -9 : compression level
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char *bname, outmode[20];
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strcpy(outmode, "wb6 ");
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bname = strrchr(argv[0], '/');
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if (!strcmp(bname, "gunzip"))
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else if (!strcmp(bname, "zcat"))
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copyout = uncompr = 1;
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if (strcmp(*argv, "-c") == 0)
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else if (strcmp(*argv, "-d") == 0)
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else if (strcmp(*argv, "-f") == 0)
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else if (strcmp(*argv, "-h") == 0)
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else if (strcmp(*argv, "-r") == 0)
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else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&
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outmode[2] = (*argv)[1];
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if (outmode[3] == ' ')
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SET_BINARY_MODE(stdin);
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SET_BINARY_MODE(stdout);
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file = 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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file = 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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SET_BINARY_MODE(stdout);
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file = gzopen(*argv, "rb");
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fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv);
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gz_uncompress(file, stdout);
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file_uncompress(*argv);
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FILE * in = fopen(*argv, "rb");
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file = 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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file_compress(*argv, outmode);
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} while (argv++, --argc);
added
removed
zlib-1.2.6/test/minigzip.c
