1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/* zip.c -- compress files to the gzip or pkzip format
* 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.
*/
#ifdef RCSID
static char rcsid[] = "$Id: zip.c,v 0.17 1993/06/10 13:29:25 jloup Exp $";
#endif
#include <config.h>
#include <ctype.h>
#include "tailor.h"
#include "gzip.h"
#include "crypt.h"
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
local ulg crc; /* crc on uncompressed file data */
off_t header_bytes; /* number of bytes in gzip header */
/* ===========================================================================
* Deflate in to out.
* IN assertions: the input and output buffers are cleared.
* The variables time_stamp and save_orig_name are initialized.
*/
int zip(in, out)
int in, out; /* input and output file descriptors */
{
uch flags = 0; /* general purpose bit flags */
ush attr = 0; /* ascii/binary flag */
ush deflate_flags = 0; /* pkzip -es, -en or -ex equivalent */
ifd = in;
ofd = out;
outcnt = 0;
/* Write the header to the gzip file. See algorithm.doc for the format */
method = DEFLATED;
put_byte(GZIP_MAGIC[0]); /* magic header */
put_byte(GZIP_MAGIC[1]);
put_byte(DEFLATED); /* compression method */
if (save_orig_name) {
flags |= ORIG_NAME;
}
put_byte(flags); /* general flags */
put_long(time_stamp == (time_stamp & 0xffffffff)
? (ulg)time_stamp : (ulg)0);
/* Write deflated file to zip file */
crc = updcrc(0, 0);
bi_init(out);
ct_init(&attr, &method);
lm_init(level, &deflate_flags);
put_byte((uch)deflate_flags); /* extra flags */
put_byte(OS_CODE); /* OS identifier */
if (save_orig_name) {
char *p = base_name(ifname); /* Don't save the directory part. */
do {
put_char(*p);
} while (*p++);
}
header_bytes = (off_t)outcnt;
(void)deflate();
#if !defined(NO_SIZE_CHECK) && !defined(RECORD_IO)
/* Check input size (but not in VMS -- variable record lengths mess it up)
* and not on MSDOS -- diet in TSR mode reports an incorrect file size)
*/
if (ifile_size != -1L && bytes_in != ifile_size) {
fprintf(stderr, "%s: %s: file size changed while zipping\n",
progname, ifname);
}
#endif
/* Write the crc and uncompressed size */
put_long(crc);
put_long((ulg)bytes_in);
header_bytes += 2*sizeof(long);
flush_outbuf();
return OK;
}
/* ===========================================================================
* Read a new buffer from the current input file, perform end-of-line
* translation, and update the crc and input file size.
* IN assertion: size >= 2 (for end-of-line translation)
*/
int file_read(buf, size)
char *buf;
unsigned size;
{
unsigned len;
Assert(insize == 0, "inbuf not empty");
len = read(ifd, buf, size);
if (len == 0) return (int)len;
if (len == (unsigned)-1) {
read_error();
return EOF;
}
crc = updcrc((uch*)buf, len);
bytes_in += (off_t)len;
return (int)len;
}
|
