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-rw-r--r--gunzip.c170
1 files changed, 90 insertions, 80 deletions
diff --git a/gunzip.c b/gunzip.c
index 7aa8964..1a5cdba 100644
--- a/gunzip.c
+++ b/gunzip.c
@@ -1,13 +1,33 @@
/* vi: set sw=4 ts=4: */
-/* zcat : stripped version based on gzip sources
- Sven Rudolph <sr1@inf.tu-dresden.de>
- */
+/*
+ * Gzip implementation for busybox
+ *
+ * Based on GNU gzip Copyright (C) 1992-1993 Jean-loup Gailly.
+ *
+ * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
+ * based on gzip sources
+ *
+ * Adjusted further by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
+ * to support files as well as stdin/stdout, and to generally behave itself wrt
+ * command line handling.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
#include "internal.h"
-#define bb_need_name_too_long
-#define BB_DECLARE_EXTERN
-#include "messages.c"
-
static const char gunzip_usage[] =
"gunzip [OPTION]... FILE\n\n"
"Uncompress FILE (or standard input if FILE is '-').\n\n"
@@ -16,6 +36,18 @@ static const char gunzip_usage[] =
"\t-c\tWrite output to standard output\n"
"\t-t\tTest compressed file integrity\n";
+
+ /* These defines are very important for BusyBox. Without these,
+ * huge chunks of ram are pre-allocated making the BusyBox bss
+ * size Freaking Huge(tm), which is a bad thing.*/
+#define SMALL_MEM
+#define DYN_ALLOC
+
+#define bb_need_name_too_long
+#define BB_DECLARE_EXTERN
+#include "messages.c"
+
+
/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
* Copyright (C) 1992-1993 Jean-loup Gailly
* The unzip code was written and put in the public domain by Mark Adler.
@@ -89,25 +121,6 @@ static char *license_msg[] = {
#define get_char() get_byte()
#define put_char(c) put_byte(c)
-/* #include "gzip.h" */
-
-/* gzip.h -- common declarations for all gzip modules
- * Copyright (C) 1992-1993 Jean-loup Gailly.
- * This is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License, see the file COPYING.
- */
-
-#if defined(__STDC__) || defined(PROTO)
-# define OF(args) args
-#else
-# define OF(args) ()
-#endif
-
-#ifdef __STDC__
-typedef void *voidp;
-#else
-typedef char *voidp;
-#endif
/* I don't like nested includes, but the string and io functions are used
* too often
@@ -118,7 +131,7 @@ typedef char *voidp;
# if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__)
# include <memory.h>
# endif
-# define memzero(s, n) memset ((voidp)(s), 0, (n))
+# define memzero(s, n) memset ((void *)(s), 0, (n))
#else
# include <strings.h>
# define strchr index
@@ -329,49 +342,46 @@ extern int save_orig_name; /* set if original name must be saved */
#define WARN(msg) {fprintf msg ; \
if (exit_code == OK) exit_code = WARNING;}
-#define do_exit(c) exit(c)
-
-
/* in unzip.c */
-extern int unzip OF((int in, int out));
+extern int unzip (int in, int out);
/* in gzip.c */
-RETSIGTYPE abort_gzip OF((void));
+RETSIGTYPE abort_gzip (void);
/* in deflate.c */
-void lm_init OF((int pack_level, ush * flags));
-ulg deflate OF((void));
+void lm_init (int pack_level, ush * flags);
+ulg deflate (void);
/* in trees.c */
-void ct_init OF((ush * attr, int *method));
-int ct_tally OF((int dist, int lc));
-ulg flush_block OF((char *buf, ulg stored_len, int eof));
+void ct_init (ush * attr, int *method);
+int ct_tally (int dist, int lc);
+ulg flush_block (char *buf, ulg stored_len, int eof);
/* in bits.c */
-void bi_init OF((file_t zipfile));
-void send_bits OF((int value, int length));
-unsigned bi_reverse OF((unsigned value, int length));
-void bi_windup OF((void));
-void copy_block OF((char *buf, unsigned len, int header));
-extern int (*read_buf) OF((char *buf, unsigned size));
+void bi_init (file_t zipfile);
+void send_bits (int value, int length);
+unsigned bi_reverse (unsigned value, int length);
+void bi_windup (void);
+void copy_block (char *buf, unsigned len, int header);
+extern int (*read_buf) (char *buf, unsigned size);
/* in util.c: */
-extern int copy OF((int in, int out));
-extern ulg updcrc OF((uch * s, unsigned n));
-extern void clear_bufs OF((void));
-extern int fill_inbuf OF((int eof_ok));
-extern void flush_outbuf OF((void));
-extern void flush_window OF((void));
-extern void write_buf OF((int fd, voidp buf, unsigned cnt));
+extern int copy (int in, int out);
+extern ulg updcrc (uch * s, unsigned n);
+extern void clear_bufs (void);
+extern int fill_inbuf (int eof_ok);
+extern void flush_outbuf (void);
+extern void flush_window (void);
+extern void write_buf (int fd, void * buf, unsigned cnt);
#ifndef __linux__
-extern char *basename OF((char *fname));
+extern char *basename (char *fname);
#endif /* not __linux__ */
-extern void read_error OF((void));
-extern void write_error OF((void));
+extern void read_error (void);
+extern void write_error (void);
/* in inflate.c */
-extern int inflate OF((void));
+extern int inflate (void);
/* #include "lzw.h" */
@@ -415,8 +425,8 @@ extern int inflate OF((void));
extern int maxbits; /* max bits per code for LZW */
extern int block_mode; /* block compress mode -C compatible with 2.0 */
-extern int lzw OF((int in, int out));
-extern int unlzw OF((int in, int out));
+extern int lzw (int in, int out);
+extern int unlzw (int in, int out);
/* #include "revision.h" */
@@ -605,7 +615,7 @@ typedef struct direct dir_type;
#if !defined(S_ISREG) && defined(S_IFREG)
# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif
-typedef RETSIGTYPE(*sig_type) OF((int));
+typedef RETSIGTYPE(*sig_type) (int);
#ifndef O_BINARY
# define O_BINARY 0 /* creation mode for open() */
@@ -644,7 +654,7 @@ typedef RETSIGTYPE(*sig_type) OF((int));
#ifdef NO_OFF_T
typedef long off_t;
-off_t lseek OF((int fd, off_t offset, int whence));
+off_t lseek (int fd, off_t offset, int whence);
#endif
@@ -687,7 +697,7 @@ long header_bytes; /* number of bytes in gzip header */
/* local functions */
-local int get_method OF((int in));
+local int get_method (int in);
#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
@@ -773,7 +783,7 @@ int gunzip_main(int argc, char **argv)
usage(gunzip_usage);
if (strlen(*argv) > MAX_PATH_LEN) {
fprintf(stderr, name_too_long, "gunzip");
- do_exit(WARNING);
+ exit(WARNING);
}
strcpy(ifname, *argv);
@@ -781,13 +791,13 @@ int gunzip_main(int argc, char **argv)
inFileNum = open(ifname, O_RDONLY);
if (inFileNum < 0) {
perror(ifname);
- do_exit(WARNING);
+ exit(WARNING);
}
/* Get the time stamp on the input file. */
result = stat(ifname, &statBuf);
if (result < 0) {
perror(ifname);
- do_exit(WARNING);
+ exit(WARNING);
}
ifile_size = statBuf.st_size;
}
@@ -812,7 +822,7 @@ int gunzip_main(int argc, char **argv)
/* And get to work */
if (strlen(ifname) > MAX_PATH_LEN - 4) {
fprintf(stderr, name_too_long, "gunzip");
- do_exit(WARNING);
+ exit(WARNING);
}
strcpy(ofname, ifname);
pos = strstr(ofname, ".gz");
@@ -836,7 +846,7 @@ int gunzip_main(int argc, char **argv)
#endif
if (outFileNum < 0) {
perror(ofname);
- do_exit(WARNING);
+ exit(WARNING);
}
/* Set permissions on the file */
fchmod(outFileNum, statBuf.st_mode);
@@ -860,7 +870,7 @@ int gunzip_main(int argc, char **argv)
exit(FALSE);
}
}
- do_exit(exit_code);
+ exit(exit_code);
}
@@ -953,7 +963,7 @@ int in; /* input file descriptor */
*/
RETSIGTYPE abort_gzip()
{
- do_exit(ERROR);
+ exit(ERROR);
}
/* unzip.c -- decompress files in gzip or pkzip format.
@@ -1027,7 +1037,7 @@ int in, out; /* input and output file descriptors */
ofd = out;
method = get_method(ifd);
if (method < 0) {
- do_exit(exit_code); /* error message already emitted */
+ exit(exit_code); /* error message already emitted */
}
updcrc(NULL, 0); /* initialize crc */
@@ -1218,7 +1228,7 @@ void flush_window()
*/
void write_buf(fd, buf, cnt)
int fd;
-voidp buf;
+void * buf;
unsigned cnt;
{
unsigned n;
@@ -1228,7 +1238,7 @@ unsigned cnt;
write_error();
}
cnt -= n;
- buf = (voidp) ((char *) buf + n);
+ buf = (void *) ((char *) buf + n);
}
}
@@ -1240,8 +1250,8 @@ unsigned cnt;
# define const
# endif
-int strspn OF((const char *s, const char *accept));
-int strcspn OF((const char *s, const char *reject));
+int strspn (const char *s, const char *accept);
+int strcspn (const char *s, const char *reject);
/* ========================================================================
* Return the length of the maximum initial segment
@@ -1493,15 +1503,15 @@ struct huft {
/* Function prototypes */
-int huft_build OF((unsigned *, unsigned, unsigned, ush *, ush *,
- struct huft **, int *));
-int huft_free OF((struct huft *));
-int inflate_codes OF((struct huft *, struct huft *, int, int));
-int inflate_stored OF((void));
-int inflate_fixed OF((void));
-int inflate_dynamic OF((void));
-int inflate_block OF((int *));
-int inflate OF((void));
+int huft_build (unsigned *, unsigned, unsigned, ush *, ush *,
+ struct huft **, int *);
+int huft_free (struct huft *);
+int inflate_codes (struct huft *, struct huft *, int, int);
+int inflate_stored (void);
+int inflate_fixed (void);
+int inflate_dynamic (void);
+int inflate_block (int *);
+int inflate (void);
/* The inflate algorithm uses a sliding 32K byte window on the uncompressed
generated by cgit v1.1 at 2024-12-27 08:37:52 +0000