4 * Generic functions for compression, wrapping around actual compression
9 * Copyright (C) 2013 Eric Biggers
11 * This file is part of wimlib, a library for working with WIM files.
13 * wimlib is free software; you can redistribute it and/or modify it under the
14 * terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 3 of the License, or (at your option)
18 * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
19 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
20 * A PARTICULAR PURPOSE. See the GNU General Public License for more
23 * You should have received a copy of the GNU General Public License
24 * along with wimlib; if not, see http://www.gnu.org/licenses/.
32 #include "wimlib/compressor_ops.h"
33 #include "wimlib/util.h"
35 struct wimlib_compressor {
36 const struct compressor_ops *ops;
40 static const struct compressor_ops *compressor_ops[] = {
41 [WIMLIB_COMPRESSION_TYPE_LZX] = &lzx_compressor_ops,
42 [WIMLIB_COMPRESSION_TYPE_XPRESS] = &xpress_compressor_ops,
43 [WIMLIB_COMPRESSION_TYPE_LZMS] = &lzms_compressor_ops,
46 static struct wimlib_compressor_params_header *
47 compressor_default_params[ARRAY_LEN(compressor_ops)] = {
51 compressor_ctype_valid(int ctype)
54 ctype < ARRAY_LEN(compressor_ops) &&
55 compressor_ops[ctype] != NULL);
59 wimlib_set_default_compressor_params(enum wimlib_compression_type ctype,
60 const struct wimlib_compressor_params_header *params)
62 struct wimlib_compressor_params_header *dup;
64 if (!compressor_ctype_valid(ctype))
65 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
69 dup = memdup(params, params->size);
71 return WIMLIB_ERR_NOMEM;
74 FREE(compressor_default_params[ctype]);
75 compressor_default_params[ctype] = dup;
80 cleanup_compressor_params(void)
82 for (size_t i = 0; i < ARRAY_LEN(compressor_default_params); i++) {
83 FREE(compressor_default_params[i]);
84 compressor_default_params[i] = NULL;
89 wimlib_create_compressor(enum wimlib_compression_type ctype,
90 size_t max_block_size,
91 const struct wimlib_compressor_params_header *extra_params,
92 struct wimlib_compressor **c_ret)
94 struct wimlib_compressor *c;
97 return WIMLIB_ERR_INVALID_PARAM;
99 if (!compressor_ctype_valid(ctype))
100 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
102 c = MALLOC(sizeof(*c));
104 return WIMLIB_ERR_NOMEM;
105 c->ops = compressor_ops[ctype];
107 if (c->ops->create_compressor) {
108 const struct wimlib_compressor_params_header *params;
112 params = extra_params;
114 params = compressor_default_params[ctype];
115 ret = c->ops->create_compressor(max_block_size,
116 params, &c->private);
127 wimlib_compress(const void *uncompressed_data, size_t uncompressed_size,
128 void *compressed_data, size_t compressed_size_avail,
129 struct wimlib_compressor *c)
131 return c->ops->compress(uncompressed_data, uncompressed_size,
132 compressed_data, compressed_size_avail,
137 wimlib_free_compressor(struct wimlib_compressor *c)
140 if (c->ops->free_compressor)
141 c->ops->free_compressor(c->private);