4 * Generic functions for decompression, wrapping around actual decompression
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/decompressor_ops.h"
33 #include "wimlib/util.h"
35 struct wimlib_decompressor {
36 const struct decompressor_ops *ops;
40 static const struct decompressor_ops *decompressor_ops[] = {
41 [WIMLIB_COMPRESSION_TYPE_LZX] = &lzx_decompressor_ops,
42 [WIMLIB_COMPRESSION_TYPE_XPRESS] = &xpress_decompressor_ops,
43 [WIMLIB_COMPRESSION_TYPE_LZMS] = &lzms_decompressor_ops,
46 static struct wimlib_decompressor_params_header *
47 decompressor_default_params[ARRAY_LEN(decompressor_ops)] = {
48 [WIMLIB_COMPRESSION_TYPE_LZX] = NULL,
49 [WIMLIB_COMPRESSION_TYPE_XPRESS] = NULL,
50 [WIMLIB_COMPRESSION_TYPE_LZMS] = NULL,
54 decompressor_ctype_valid(int ctype)
57 ctype < ARRAY_LEN(decompressor_ops) &&
58 decompressor_ops[ctype] != NULL);
62 wimlib_set_default_decompressor_params(enum wimlib_compression_type ctype,
63 const struct wimlib_decompressor_params_header *params)
65 struct wimlib_decompressor_params_header *dup;
67 if (!decompressor_ctype_valid(ctype))
68 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
72 dup = memdup(params, params->size);
74 return WIMLIB_ERR_NOMEM;
77 FREE(decompressor_default_params[ctype]);
78 decompressor_default_params[ctype] = dup;
83 cleanup_decompressor_params(void)
85 for (size_t i = 0; i < ARRAY_LEN(decompressor_default_params); i++) {
86 FREE(decompressor_default_params[i]);
87 decompressor_default_params[i] = NULL;
92 wimlib_create_decompressor(enum wimlib_compression_type ctype,
93 size_t max_block_size,
94 const struct wimlib_decompressor_params_header *extra_params,
95 struct wimlib_decompressor **dec_ret)
97 struct wimlib_decompressor *dec;
100 return WIMLIB_ERR_INVALID_PARAM;
102 if (!decompressor_ctype_valid(ctype))
103 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
105 dec = MALLOC(sizeof(*dec));
107 return WIMLIB_ERR_NOMEM;
108 dec->ops = decompressor_ops[ctype];
110 if (dec->ops->create_decompressor) {
111 const struct wimlib_decompressor_params_header *params;
115 params = extra_params;
117 params = decompressor_default_params[ctype];
118 ret = dec->ops->create_decompressor(max_block_size,
131 wimlib_decompress(const void *compressed_data, size_t compressed_size,
132 void *uncompressed_data, size_t uncompressed_size,
133 struct wimlib_decompressor *dec)
135 return dec->ops->decompress(compressed_data, compressed_size,
136 uncompressed_data, uncompressed_size,
141 wimlib_free_decompressor(struct wimlib_decompressor *dec)
144 if (dec->ops->free_decompressor)
145 dec->ops->free_decompressor(dec->private);