/* minigzip.c -- simulate gzip using the zlib compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
* For conditions of distribution and use, see copyright notice in zlib.h
*/
* or in pipe mode.
*/
-/* $Id: minigzip.c,v 1.5 1995/05/03 17:27:11 jloup Exp $ */
+/* @(#) $Id$ */
#include <stdio.h>
#include "zlib.h"
-#ifndef __GO32__
-extern void exit __P((int));
-#endif
-extern int unlink __P((const char *));
-
#ifdef STDC
# include <string.h>
+# include <stdlib.h>
+#else
+ extern void exit OF((int));
+#endif
+
+#ifdef USE_MMAP
+# include <sys/types.h>
+# include <sys/mman.h>
+# include <sys/stat.h>
#endif
#if defined(MSDOS) || defined(OS2) || defined(WIN32)
# define SET_BINARY_MODE(file)
#endif
-#define BUFLEN 4096
+#ifdef VMS
+# define unlink delete
+# define GZ_SUFFIX "-gz"
+#endif
+#ifdef RISCOS
+# define unlink remove
+# define GZ_SUFFIX "-gz"
+# define fileno(file) file->__file
+#endif
+#if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
+# include <unix.h> /* for fileno */
+#endif
+
+#ifndef WIN32 /* unlink already in stdio.h for WIN32 */
+ extern int unlink OF((const char *));
+#endif
+
+#ifndef GZ_SUFFIX
+# define GZ_SUFFIX ".gz"
+#endif
+#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
+
+#define BUFLEN 16384
#define MAX_NAME_LEN 1024
-#define local static
-/* For MSDOS and other systems with limitation on stack size. For Unix,
- #define local
- works also.
- */
+#ifdef MAXSEG_64K
+# define local static
+ /* Needed for systems with limitation on stack size. */
+#else
+# define local
+#endif
char *prog;
-void error __P((char *msg));
-void gz_compress __P((FILE *in, gzFile out));
-void gz_uncompress __P((gzFile in, FILE *out));
-void file_compress __P((char *file));
-void file_uncompress __P((char *file));
-void main __P((int argc, char *argv[]));
+void error OF((const char *msg));
+void gz_compress OF((FILE *in, gzFile out));
+#ifdef USE_MMAP
+int gz_compress_mmap OF((FILE *in, gzFile out));
+#endif
+void gz_uncompress OF((gzFile in, FILE *out));
+void file_compress OF((char *file, char *mode));
+void file_uncompress OF((char *file));
+int main OF((int argc, char *argv[]));
/* ===========================================================================
* Display error message and exit
*/
void error(msg)
- char *msg;
+ const char *msg;
{
fprintf(stderr, "%s: %s\n", prog, msg);
exit(1);
/* ===========================================================================
* Compress input to output then close both files.
*/
+
void gz_compress(in, out)
FILE *in;
gzFile out;
int len;
int err;
+#ifdef USE_MMAP
+ /* Try first compressing with mmap. If mmap fails (minigzip used in a
+ * pipe), use the normal fread loop.
+ */
+ if (gz_compress_mmap(in, out) == Z_OK) return;
+#endif
for (;;) {
len = fread(buf, 1, sizeof(buf), in);
if (ferror(in)) {
}
if (len == 0) break;
- if (gzwrite(out, buf, len) != len) error(gzerror(out, &err));
+ if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));
}
fclose(in);
if (gzclose(out) != Z_OK) error("failed gzclose");
}
+#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
+
+/* Try compressing the input file at once using mmap. Return Z_OK if
+ * if success, Z_ERRNO otherwise.
+ */
+int gz_compress_mmap(in, out)
+ FILE *in;
+ gzFile out;
+{
+ int len;
+ int err;
+ int ifd = fileno(in);
+ caddr_t buf; /* mmap'ed buffer for the entire input file */
+ off_t buf_len; /* length of the input file */
+ struct stat sb;
+
+ /* Determine the size of the file, needed for mmap: */
+ if (fstat(ifd, &sb) < 0) return Z_ERRNO;
+ buf_len = sb.st_size;
+ if (buf_len <= 0) return Z_ERRNO;
+
+ /* Now do the actual mmap: */
+ buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
+ if (buf == (caddr_t)(-1)) return Z_ERRNO;
+
+ /* Compress the whole file at once: */
+ len = gzwrite(out, (char *)buf, (unsigned)buf_len);
+
+ if (len != (int)buf_len) error(gzerror(out, &err));
+
+ munmap(buf, buf_len);
+ fclose(in);
+ if (gzclose(out) != Z_OK) error("failed gzclose");
+ return Z_OK;
+}
+#endif /* USE_MMAP */
+
/* ===========================================================================
* Uncompress input to output then close both files.
*/
if (len < 0) error (gzerror(in, &err));
if (len == 0) break;
- if (fwrite(buf, 1, len, out) != (uInt)len) error("failed fwrite");
+ if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
+ error("failed fwrite");
+ }
}
if (fclose(out)) error("failed fclose");
* Compress the given file: create a corresponding .gz file and remove the
* original.
*/
-void file_compress(file)
+void file_compress(file, mode)
char *file;
+ char *mode;
{
local char outfile[MAX_NAME_LEN];
FILE *in;
gzFile out;
strcpy(outfile, file);
- strcat(outfile, ".gz");
+ strcat(outfile, GZ_SUFFIX);
in = fopen(file, "rb");
if (in == NULL) {
perror(file);
exit(1);
}
- out = gzopen(outfile, "wb");
+ out = gzopen(outfile, mode);
if (out == NULL) {
fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
exit(1);
strcpy(buf, file);
- if (len > 3 && strcmp(file+len-3, ".gz") == 0) {
+ if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {
infile = file;
outfile = buf;
outfile[len-3] = '\0';
} else {
outfile = file;
infile = buf;
- strcat(infile, ".gz");
+ strcat(infile, GZ_SUFFIX);
}
in = gzopen(infile, "rb");
if (in == NULL) {
/* ===========================================================================
- * Usage: minigzip [-d] [files...]
+ * Usage: minigzip [-d] [-f] [-h] [-1 to -9] [files...]
+ * -d : decompress
+ * -f : compress with Z_FILTERED
+ * -h : compress with Z_HUFFMAN_ONLY
+ * -1 to -9 : compression level
*/
-void main(argc, argv)
+int main(argc, argv)
int argc;
char *argv[];
{
int uncompr = 0;
gzFile file;
+ char outmode[20];
+
+ strcpy(outmode, "wb6 ");
prog = argv[0];
argc--, argv++;
- if (argc > 0) {
- uncompr = (strcmp(*argv, "-d") == 0);
- if (uncompr) {
- argc--, argv++;
- }
+ while (argc > 0) {
+ if (strcmp(*argv, "-d") == 0)
+ uncompr = 1;
+ else if (strcmp(*argv, "-f") == 0)
+ outmode[3] = 'f';
+ else if (strcmp(*argv, "-h") == 0)
+ outmode[3] = 'h';
+ else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&
+ (*argv)[2] == 0)
+ outmode[2] = (*argv)[1];
+ else
+ break;
+ argc--, argv++;
}
if (argc == 0) {
SET_BINARY_MODE(stdin);
if (file == NULL) error("can't gzdopen stdin");
gz_uncompress(file, stdout);
} else {
- file = gzdopen(fileno(stdout), "wb");
+ file = gzdopen(fileno(stdout), outmode);
if (file == NULL) error("can't gzdopen stdout");
gz_compress(stdin, file);
}
if (uncompr) {
file_uncompress(*argv);
} else {
- file_compress(*argv);
+ file_compress(*argv, outmode);
}
} while (argv++, --argc);
}
exit(0);
+ return 0; /* to avoid warning */
}
projects / zlib.git / blobdiff