]> Dogcows Code - chaz/tar/blob - src/suffix.c
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[chaz/tar] / src / suffix.c
1 /* This file is part of GNU tar.
2 Copyright 2007, 2009, 2013 Free Software Foundation, Inc.
3
4 Written by Sergey Poznyakoff.
5
6 GNU tar is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 3, or (at your option) any later
9 version.
10
11 GNU tar is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
14 Public License for more details.
15
16 You should have received a copy of the GNU General Public License along
17 with GNU tar. If not, see <http://www.gnu.org/licenses/>. */
18
19 #include <system.h>
20 #include "common.h"
21
22 struct compression_suffix
23 {
24 const char *suffix;
25 size_t length;
26 const char *program;
27 };
28
29 static struct compression_suffix compression_suffixes[] = {
30 #define __CAT2__(a,b) a ## b
31 #define S(s,p) #s, sizeof (#s) - 1, __CAT2__(p,_PROGRAM)
32 { S(gz, GZIP) },
33 { S(tgz, GZIP) },
34 { S(taz, GZIP) },
35 { S(Z, COMPRESS) },
36 { S(taZ, COMPRESS) },
37 { S(bz2, BZIP2) },
38 { S(tbz, BZIP2) },
39 { S(tbz2, BZIP2) },
40 { S(tz2, BZIP2) },
41 { S(lz, LZIP) },
42 { S(lzma, LZMA) },
43 { S(tlz, LZMA) },
44 { S(lzo, LZOP) },
45 { S(xz, XZ) },
46 #undef S
47 #undef __CAT2__
48 };
49
50 static int nsuffixes = sizeof (compression_suffixes) /
51 sizeof (compression_suffixes[0]);
52
53 static const char *
54 find_compression_program (const char *name, const char *defprog)
55 {
56 char *suf = strrchr (name, '.');
57
58 if (suf)
59 {
60 int i;
61 size_t len;
62
63 suf++;
64 len = strlen (suf);
65
66 for (i = 0; i < nsuffixes; i++)
67 {
68 if (compression_suffixes[i].length == len
69 && memcmp (compression_suffixes[i].suffix, suf, len) == 0)
70 return compression_suffixes[i].program;
71 }
72 }
73 return defprog;
74 }
75
76 void
77 set_compression_program_by_suffix (const char *name, const char *defprog)
78 {
79 const char *program = find_compression_program (name, defprog);
80 if (program)
81 use_compress_program_option = program;
82 }
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