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
29static struct compressor gzip_comp_ops =  {
30	ZLIB_COMPRESSION, "gzip"
31};
32#else
33extern struct compressor gzip_comp_ops;
34#endif
35
36#ifndef LZMA_SUPPORT
37static struct compressor lzma_comp_ops = {
38	LZMA_COMPRESSION, "lzma"
39};
40#else
41extern struct compressor lzma_comp_ops;
42#endif
43
44#ifndef LZO_SUPPORT
45static struct compressor lzo_comp_ops = {
46	LZO_COMPRESSION, "lzo"
47};
48#else
49extern struct compressor lzo_comp_ops;
50#endif
51
52#ifndef LZ4_SUPPORT
53static struct compressor lz4_comp_ops = {
54	LZ4_COMPRESSION, "lz4"
55};
56#else
57extern struct compressor lz4_comp_ops;
58#endif
59
60#ifndef XZ_SUPPORT
61static struct compressor xz_comp_ops = {
62	XZ_COMPRESSION, "xz"
63};
64#else
65extern struct compressor xz_comp_ops;
66#endif
67
68
69static struct compressor unknown_comp_ops = {
70	0, "unknown"
71};
72
73
74struct 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
84struct 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
96struct 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
108void 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
121void 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