wimlib.net Git - wimlib/blob - src/decompress.c

   1 /*
   2  * decompress.c
   3  *
   4  * Generic functions for decompression, wrapping around actual decompression
   5  * implementations.
   6  */
   7
   8 /*
   9  * Copyright (C) 2013 Eric Biggers
  10  *
  11  * This file is part of wimlib, a library for working with WIM files.
  12  *
  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)
  16  * any later version.
  17  *
  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
  21  * details.
  22  *
  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/.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 #  include "config.h"
  29 #endif
  30
  31 #include "wimlib.h"
  32 #include "wimlib/decompressor_ops.h"
  33 #include "wimlib/util.h"
  34
  35 struct wimlib_decompressor {
  36         const struct decompressor_ops *ops;
  37         void *private;
  38 };
  39
  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,
  44 };
  45
  46 static struct wimlib_decompressor_params_header *
  47 decompressor_default_params[ARRAY_LEN(decompressor_ops)] = {
  48 };
  49
  50 static bool
  51 decompressor_ctype_valid(int ctype)
  52 {
  53         return (ctype >= 0 &&
  54                 ctype < ARRAY_LEN(decompressor_ops) &&
  55                 decompressor_ops[ctype] != NULL);
  56 }
  57
  58 WIMLIBAPI int
  59 wimlib_set_default_decompressor_params(enum wimlib_compression_type ctype,
  60                                        const struct wimlib_decompressor_params_header *params)
  61 {
  62         struct wimlib_decompressor_params_header *dup;
  63
  64         if (!decompressor_ctype_valid(ctype))
  65                 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
  66
  67         dup = NULL;
  68         if (params) {
  69                 dup = memdup(params, params->size);
  70                 if (dup == NULL)
  71                         return WIMLIB_ERR_NOMEM;
  72         }
  73
  74         FREE(decompressor_default_params[ctype]);
  75         decompressor_default_params[ctype] = dup;
  76         return 0;
  77 }
  78
  79 void
  80 cleanup_decompressor_params(void)
  81 {
  82         for (size_t i = 0; i < ARRAY_LEN(decompressor_default_params); i++) {
  83                 FREE(decompressor_default_params[i]);
  84                 decompressor_default_params[i] = NULL;
  85         }
  86 }
  87
  88 WIMLIBAPI int
  89 wimlib_create_decompressor(enum wimlib_compression_type ctype,
  90                            size_t max_block_size,
  91                            const struct wimlib_decompressor_params_header *extra_params,
  92                            struct wimlib_decompressor **dec_ret)
  93 {
  94         struct wimlib_decompressor *dec;
  95
  96         if (dec_ret == NULL)
  97                 return WIMLIB_ERR_INVALID_PARAM;
  98
  99         if (!decompressor_ctype_valid(ctype))
 100                 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 101
 102         dec = MALLOC(sizeof(*dec));
 103         if (dec == NULL)
 104                 return WIMLIB_ERR_NOMEM;
 105         dec->ops = decompressor_ops[ctype];
 106         dec->private = NULL;
 107         if (dec->ops->create_decompressor) {
 108                 const struct wimlib_decompressor_params_header *params;
 109                 int ret;
 110
 111                 if (extra_params)
 112                         params = extra_params;
 113                 else
 114                         params = decompressor_default_params[ctype];
 115                 ret = dec->ops->create_decompressor(max_block_size,
 116                                                     params,
 117                                                     &dec->private);
 118                 if (ret) {
 119                         FREE(dec);
 120                         return ret;
 121                 }
 122         }
 123         *dec_ret = dec;
 124         return 0;
 125 }
 126
 127 WIMLIBAPI int
 128 wimlib_decompress(const void *compressed_data, size_t compressed_size,
 129                   void *uncompressed_data, size_t uncompressed_size,
 130                   struct wimlib_decompressor *dec)
 131 {
 132         return dec->ops->decompress(compressed_data, compressed_size,
 133                                     uncompressed_data, uncompressed_size,
 134                                     dec->private);
 135 }
 136
 137 WIMLIBAPI void
 138 wimlib_free_decompressor(struct wimlib_decompressor *dec)
 139 {
 140         if (dec) {
 141                 if (dec->ops->free_decompressor)
 142                         dec->ops->free_decompressor(dec->private);
 143                 FREE(dec);
 144         }
 145 }