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comparison old-trunk/lwar/extract.c @ 339:eb230fa7d28e

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Prepare for migration to hg
author lost
date Fri, 19 Mar 2010 02:54:14 +0000
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338:e7885b3ee266 339:eb230fa7d28e
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 #include <config.h>
23
24 #include <errno.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28
29 #include "lwar.h"
30
31 void do_extract(void)
32 {
33 FILE *f;
34 char buf[8];
35 long l;
36 int c;
37 char fnbuf[1024];
38 int i;
39 FILE *nf;
40
41 f = fopen(archive_file, "r");
42 if (!f)
43 {
44 perror("Opening archive file");
45 exit(1);
46 }
47
48 fread(buf, 1, 6, f);
49 if (memcmp("LWAR1V", buf, 6))
50 {
51 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
52 exit(1);
53 }
54
55 for (;;)
56 {
57 c = fgetc(f);
58 if (ferror(f))
59 {
60 perror("Reading archive file");
61 exit(1);
62 }
63 if (c == EOF)
64 return;
65
66
67 // find the end of the file name
68 if (!c)
69 return;
70
71 i = 0;
72 while (c)
73 {
74 fnbuf[i++] = c;
75 c = fgetc(f);
76 if (c == EOF || ferror(f))
77 {
78 fprintf(stderr, "Bad archive file\n");
79 exit(1);
80 }
81 }
82 fnbuf[i] = 0;
83
84 // get length of archive member
85 l = 0;
86 c = fgetc(f);
87 l = c << 24;
88 c = fgetc(f);
89 l |= c << 16;
90 c = fgetc(f);
91 l |= c << 8;
92 c = fgetc(f);
93 l |= c;
94
95 for (i = 0; i < nfiles; i++)
96 {
97 if (!strcmp(files[i], fnbuf))
98 break;
99 }
100 if (i < nfiles || nfiles == 0)
101 {
102 // extract the file
103 nf = fopen(fnbuf, "w");
104 if (!nf)
105 {
106 fprintf(stderr, "Cannot extract '%s': %s\n", fnbuf, strerror(errno));
107 exit(1);
108 }
109 while (l)
110 {
111 c = fgetc(f);
112 fputc(c, nf);
113 l--;
114 }
115 fclose(nf);
116 }
117 else
118 {
119 // skip the file
120 fseek(f, l, SEEK_CUR);
121 }
122 }
123 }