1 /*
2 *
3 * Copyright (c) 2009, 2010, 2011
4 * Phillip Lougher <phillip@squashfs.org.uk>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2,
9 * or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 *
20 * compressor.c
21 */
22
23 #include <stdio.h>
24 #include <string.h>
25 #include "compressor.h"
26 #include "squashfs_fs.h"
27
28 #ifndef GZIP_SUPPORT
29 static struct compressor gzip_comp_ops = {
30 ZLIB_COMPRESSION, "gzip"
31 };
32 #else
33 extern struct compressor gzip_comp_ops;
34 #endif
35
36 #ifndef LZMA_SUPPORT
37 static struct compressor lzma_comp_ops = {
38 LZMA_COMPRESSION, "lzma"
39 };
40 #else
41 extern struct compressor lzma_comp_ops;
42 #endif
43
44 #ifndef LZO_SUPPORT
45 static struct compressor lzo_comp_ops = {
46 LZO_COMPRESSION, "lzo"
47 };
48 #else
49 extern struct compressor lzo_comp_ops;
50 #endif
51
52 #ifndef LZ4_SUPPORT
53 static struct compressor lz4_comp_ops = {
54 LZ4_COMPRESSION, "lz4"
55 };
56 #else
57 extern struct compressor lz4_comp_ops;
58 #endif
59
60 #ifndef XZ_SUPPORT
61 static struct compressor xz_comp_ops = {
62 XZ_COMPRESSION, "xz"
63 };
64 #else
65 extern struct compressor xz_comp_ops;
66 #endif
67
68
69 static struct compressor unknown_comp_ops = {
70 0, "unknown"
71 };
72
73
74 struct compressor *compressor[] = {
75 &gzip_comp_ops,
76 &lzma_comp_ops,
77 &lzo_comp_ops,
78 &lz4_comp_ops,
79 &xz_comp_ops,
80 &unknown_comp_ops
81 };
82
83
lookup_compressor(char * name)84 struct compressor *lookup_compressor(char *name)
85 {
86 int i;
87
88 for(i = 0; compressor[i]->id; i++)
89 if(strcmp(compressor[i]->name, name) == 0)
90 break;
91
92 return compressor[i];
93 }
94
95
lookup_compressor_id(int id)96 struct compressor *lookup_compressor_id(int id)
97 {
98 int i;
99
100 for(i = 0; compressor[i]->id; i++)
101 if(id == compressor[i]->id)
102 break;
103
104 return compressor[i];
105 }
106
107
display_compressors(char * indent,char * def_comp)108 void display_compressors(char *indent, char *def_comp)
109 {
110 int i;
111
112 for(i = 0; compressor[i]->id; i++)
113 if(compressor[i]->supported)
114 fprintf(stderr, "%s\t%s%s\n", indent,
115 compressor[i]->name,
116 strcmp(compressor[i]->name, def_comp) == 0 ?
117 " (default)" : "");
118 }
119
120
display_compressor_usage(char * def_comp)121 void display_compressor_usage(char *def_comp)
122 {
123 int i;
124
125 for(i = 0; compressor[i]->id; i++)
126 if(compressor[i]->supported) {
127 char *str = strcmp(compressor[i]->name, def_comp) == 0 ?
128 " (default)" : "";
129 if(compressor[i]->usage) {
130 fprintf(stderr, "\t%s%s\n",
131 compressor[i]->name, str);
132 compressor[i]->usage();
133 } else
134 fprintf(stderr, "\t%s (no options)%s\n",
135 compressor[i]->name, str);
136 }
137 }
138