|
188
|
1 /*
|
|
|
2 extract.c
|
|
|
3 Copyright © 2009 William Astle
|
|
|
4
|
|
|
5 This file is part of LWAR.
|
|
|
6
|
|
|
7 LWAR is free software: you can redistribute it and/or modify it under the
|
|
|
8 terms of the GNU General Public License as published by the Free Software
|
|
|
9 Foundation, either version 3 of the License, or (at your option) any later
|
|
|
10 version.
|
|
|
11
|
|
|
12 This program is distributed in the hope that it will be useful, but WITHOUT
|
|
|
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
|
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
|
15 more details.
|
|
|
16
|
|
|
17 You should have received a copy of the GNU General Public License along with
|
|
|
18 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
19
|
|
|
20 */
|
|
|
21
|
|
|
22 #ifdef HAVE_CONFIG_H
|
|
|
23 #include "config.h"
|
|
|
24 #endif
|
|
|
25
|
|
|
26 #include <errno.h>
|
|
|
27 #include <stdio.h>
|
|
|
28 #include <stdlib.h>
|
|
|
29 #include <string.h>
|
|
|
30
|
|
|
31 #include "lwar.h"
|
|
|
32
|
|
|
33 void do_extract(void)
|
|
|
34 {
|
|
|
35 FILE *f;
|
|
|
36 char buf[8];
|
|
|
37 long l;
|
|
|
38 int c;
|
|
|
39 char fnbuf[1024];
|
|
|
40 int i;
|
|
|
41 FILE *nf;
|
|
|
42
|
|
|
43 f = fopen(archive_file, "r");
|
|
|
44 if (!f)
|
|
|
45 {
|
|
|
46 perror("Opening archive file");
|
|
|
47 exit(1);
|
|
|
48 }
|
|
|
49
|
|
|
50 fread(buf, 1, 6, f);
|
|
|
51 if (memcmp("LWAR1V", buf, 6))
|
|
|
52 {
|
|
|
53 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
|
|
|
54 exit(1);
|
|
|
55 }
|
|
|
56
|
|
|
57 for (;;)
|
|
|
58 {
|
|
|
59 c = fgetc(f);
|
|
|
60 if (ferror(f))
|
|
|
61 {
|
|
|
62 perror("Reading archive file");
|
|
|
63 exit(1);
|
|
|
64 }
|
|
|
65 if (c == EOF)
|
|
|
66 return;
|
|
|
67
|
|
|
68
|
|
|
69 // find the end of the file name
|
|
|
70 if (!c)
|
|
|
71 return;
|
|
|
72
|
|
|
73 i = 0;
|
|
|
74 while (c)
|
|
|
75 {
|
|
|
76 fnbuf[i++] = c;
|
|
|
77 c = fgetc(f);
|
|
|
78 if (c == EOF || ferror(f))
|
|
|
79 {
|
|
|
80 fprintf(stderr, "Bad archive file\n");
|
|
|
81 exit(1);
|
|
|
82 }
|
|
|
83 }
|
|
|
84 fnbuf[i] = 0;
|
|
|
85
|
|
|
86 // get length of archive member
|
|
|
87 l = 0;
|
|
|
88 c = fgetc(f);
|
|
|
89 l = c << 24;
|
|
|
90 c = fgetc(f);
|
|
|
91 l |= c << 16;
|
|
|
92 c = fgetc(f);
|
|
|
93 l |= c << 8;
|
|
|
94 c = fgetc(f);
|
|
|
95 l |= c;
|
|
|
96
|
|
|
97 for (i = 0; i < nfiles; i++)
|
|
|
98 {
|
|
|
99 if (!strcmp(files[i], fnbuf))
|
|
|
100 break;
|
|
|
101 }
|
|
|
102 if (i < nfiles || nfiles == 0)
|
|
|
103 {
|
|
|
104 // extract the file
|
|
|
105 nf = fopen(fnbuf, "w");
|
|
|
106 if (!nf)
|
|
|
107 {
|
|
|
108 fprintf(stderr, "Cannot extract '%s': %s\n", fnbuf, strerror(errno));
|
|
|
109 exit(1);
|
|
|
110 }
|
|
|
111 while (l)
|
|
|
112 {
|
|
|
113 c = fgetc(f);
|
|
|
114 fputc(c, nf);
|
|
|
115 l--;
|
|
|
116 }
|
|
|
117 fclose(nf);
|
|
|
118 }
|
|
|
119 else
|
|
|
120 {
|
|
|
121 // skip the file
|
|
|
122 fseek(f, l, SEEK_CUR);
|
|
|
123 }
|
|
|
124 }
|
|
|
125 }
|
