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)] = {
48 [WIMLIB_COMPRESSION_TYPE_LZX] = NULL,
49 [WIMLIB_COMPRESSION_TYPE_XPRESS] = NULL,
50 [WIMLIB_COMPRESSION_TYPE_LZMS] = NULL,
54 compressor_ctype_valid(int ctype)
57 ctype < ARRAY_LEN(compressor_ops) &&
58 compressor_ops[ctype] != NULL);
62 wimlib_set_default_compressor_params(enum wimlib_compression_type ctype,
63 const struct wimlib_compressor_params_header *params)
65 struct wimlib_compressor_params_header *dup;
67 if (!compressor_ctype_valid(ctype))
68 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
72 dup = memdup(params, params->size);
74 return WIMLIB_ERR_NOMEM;
77 FREE(compressor_default_params[ctype]);
78 compressor_default_params[ctype] = dup;
83 cleanup_compressor_params(void)
85 for (size_t i = 0; i < ARRAY_LEN(compressor_default_params); i++) {
86 FREE(compressor_default_params[i]);
87 compressor_default_params[i] = NULL;
92 wimlib_create_compressor(enum wimlib_compression_type ctype,
93 size_t max_block_size,
94 const struct wimlib_compressor_params_header *extra_params,
95 struct wimlib_compressor **c_ret)
97 struct wimlib_compressor *c;
100 return WIMLIB_ERR_INVALID_PARAM;
102 if (!compressor_ctype_valid(ctype))
103 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
105 c = MALLOC(sizeof(*c));
107 return WIMLIB_ERR_NOMEM;
108 c->ops = compressor_ops[ctype];
110 if (c->ops->create_compressor) {
111 const struct wimlib_compressor_params_header *params;
115 params = extra_params;
117 params = compressor_default_params[ctype];
118 ret = c->ops->create_compressor(max_block_size,
119 params, &c->private);
130 wimlib_compress(const void *uncompressed_data, size_t uncompressed_size,
131 void *compressed_data, size_t compressed_size_avail,
132 struct wimlib_compressor *c)
134 return c->ops->compress(uncompressed_data, uncompressed_size,
135 compressed_data, compressed_size_avail,
140 wimlib_free_compressor(struct wimlib_compressor *c)
143 if (c->ops->free_compressor)
144 c->ops->free_compressor(c->private);