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python/Modules/zlib/minigzip.c at master · pylee/python · GitHub
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/* minigzip.c -- simulate gzip using the zlib compression library
* Copyright (C) 1995-2005 Jean-loup Gailly.
* For conditions of distribution and use, see copyright notice in zlib.h
*/
/*
* minigzip is a minimal implementation of the gzip utility. This is
* only an example of using zlib and isn't meant to replace the
* full-featured gzip. No attempt is made to deal with file systems
* limiting names to 14 or 8+3 characters, etc... Error checking is
* very limited. So use minigzip only for testing; use gzip for the
* real thing. On MSDOS, use only on file names without extension
* or in pipe mode.
*/
/* @(#) $Id$ */
#include
<stdio.h>
#include
"zlib.h"
#ifdef
STDC
# include
<string.h>
# include
<stdlib.h>
#endif
#ifdef
USE_MMAP
# include
<sys/types.h>
# include
<sys/mman.h>
# include
<sys/stat.h>
#endif
#if
defined(
MSDOS
)
||
defined(
OS2
)
||
defined(
WIN32
)
||
defined(
__CYGWIN__
)
# include
<fcntl.h>
# include
<io.h>
# define
SET_BINARY_MODE
(
file
) setmode(fileno(file), O_BINARY)
#else
# define
SET_BINARY_MODE
(
file
)
#endif
#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
#ifdef
MAXSEG_64K
# define
local
static
/* Needed for systems with limitation on stack size. */
#else
# define
local
#endif
char
*
prog
;
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
)
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
;
{
local
char
buf
[
BUFLEN
];
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
=
(
int
)
fread
(
buf
,
1
,
sizeof
(
buf
),
in
);
if
(
ferror
(
in
)) {
perror
(
"fread"
);
exit
(
1
);
}
if
(
len
==
0
)
break
;
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.
*/
void
gz_uncompress
(
in
,
out
)
gzFile
in
;
FILE
*
out
;
{
local
char
buf
[
BUFLEN
];
int
len
;
int
err
;
for
(;;) {
len
=
gzread
(
in
,
buf
,
sizeof
(
buf
));
if
(
len
<
0
)
error
(
gzerror
(
in
,
&
err
));
if
(
len
==
0
)
break
;
if
((
int
)
fwrite
(
buf
,
1
, (
unsigned
)
len
,
out
)
!=
len
) {
error
(
"failed fwrite"
);
}
}
if
(
fclose
(
out
))
error
(
"failed fclose"
);
if
(
gzclose
(
in
)
!=
Z_OK
)
error
(
"failed gzclose"
);
}
/* ===========================================================================
* Compress the given file: create a corresponding .gz file and remove the
* original.
*/
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_SUFFIX
);
in
=
fopen
(
file
,
"rb"
);
if
(
in
==
NULL
) {
perror
(
file
);
exit
(
1
);
}
out
=
gzopen
(
outfile
,
mode
);
if
(
out
==
NULL
) {
fprintf
(
stderr
,
"%s: can't gzopen %s\n"
,
prog
,
outfile
);
exit
(
1
);
}
gz_compress
(
in
,
out
);
unlink
(
file
);
}
/* ===========================================================================
* Uncompress the given file and remove the original.
*/
void
file_uncompress
(
file
)
char
*
file
;
{
local
char
buf
[
MAX_NAME_LEN
];
char
*
infile
,
*
outfile
;
FILE
*
out
;
gzFile
in
;
uInt
len
=
(
uInt
)
strlen
(
file
);
strcpy
(
buf
,
file
);
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_SUFFIX
);
}
in
=
gzopen
(
infile
,
"rb"
);
if
(
in
==
NULL
) {
fprintf
(
stderr
,
"%s: can't gzopen %s\n"
,
prog
,
infile
);
exit
(
1
);
}
out
=
fopen
(
outfile
,
"wb"
);
if
(
out
==
NULL
) {
perror
(
file
);
exit
(
1
);
}
gz_uncompress
(
in
,
out
);
unlink
(
infile
);
}
/* ===========================================================================
* Usage: minigzip [-d] [-f] [-h] [-r] [-1 to -9] [files...]
* -d : decompress
* -f : compress with Z_FILTERED
* -h : compress with Z_HUFFMAN_ONLY
* -r : compress with Z_RLE
* -1 to -9 : compression level
*/
int
main
(
argc
,
argv
)
int
argc
;
char
*
argv
[];
{
int
uncompr
=
0
;
gzFile
file
;
char
outmode
[
20
];
strcpy
(
outmode
,
"wb6 "
);
prog
=
argv
[
0
];
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
(
strcmp
(
*
argv
,
"-r"
)
==
0
)
outmode
[
3
]
=
'R'
;
else
if
((
*
argv
)[
0
]
==
'-'
&&
(
*
argv
)[
1
] >=
'1'
&&
(
*
argv
)[
1
] <=
'9'
&&
(
*
argv
)[
2
]
==
0
)
outmode
[
2
]
=
(
*
argv
)[
1
];
else
break
;
argc
--
,
argv
++
;
}
if
(
outmode
[
3
]
==
' '
)
outmode
[
3
]
=
0
;
if
(
argc
==
0
) {
SET_BINARY_MODE
(
stdin
);
SET_BINARY_MODE
(
stdout
);
if
(
uncompr
) {
file
=
gzdopen
(
fileno
(
stdin
),
"rb"
);
if
(
file
==
NULL
)
error
(
"can't gzdopen stdin"
);
gz_uncompress
(
file
,
stdout
);
}
else
{
file
=
gzdopen
(
fileno
(
stdout
),
outmode
);
if
(
file
==
NULL
)
error
(
"can't gzdopen stdout"
);
gz_compress
(
stdin
,
file
);
}
}
else
{
do
{
if
(
uncompr
) {
file_uncompress
(
*
argv
);
}
else
{
file_compress
(
*
argv
,
outmode
);
}
}
while
(
argv
++
,
--
argc
);
}
return
0
;
}
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