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, 2014 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_XPRESS] = &xpress_decompressor_ops,
  42         [WIMLIB_COMPRESSION_TYPE_LZX]    = &lzx_decompressor_ops,
  43         [WIMLIB_COMPRESSION_TYPE_LZMS]   = &lzms_decompressor_ops,
  44 };
  45
  46 static bool
  47 decompressor_ctype_valid(int ctype)
  48 {
  49         return (ctype >= 0 &&
  50                 ctype < ARRAY_LEN(decompressor_ops) &&
  51                 decompressor_ops[ctype] != NULL);
  52 }
  53
  54 WIMLIBAPI int
  55 wimlib_create_decompressor(enum wimlib_compression_type ctype,
  56                            size_t max_block_size,
  57                            struct wimlib_decompressor **dec_ret)
  58 {
  59         struct wimlib_decompressor *dec;
  60
  61         if (dec_ret == NULL)
  62                 return WIMLIB_ERR_INVALID_PARAM;
  63
  64         if (!decompressor_ctype_valid(ctype))
  65                 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
  66
  67         dec = MALLOC(sizeof(*dec));
  68         if (dec == NULL)
  69                 return WIMLIB_ERR_NOMEM;
  70         dec->ops = decompressor_ops[ctype];
  71         dec->private = NULL;
  72         if (dec->ops->create_decompressor) {
  73                 int ret;
  74
  75                 ret = dec->ops->create_decompressor(max_block_size,
  76                                                     &dec->private);
  77                 if (ret) {
  78                         FREE(dec);
  79                         return ret;
  80                 }
  81         }
  82         *dec_ret = dec;
  83         return 0;
  84 }
  85
  86 WIMLIBAPI int
  87 wimlib_decompress(const void *compressed_data, size_t compressed_size,
  88                   void *uncompressed_data, size_t uncompressed_size,
  89                   struct wimlib_decompressor *dec)
  90 {
  91         return dec->ops->decompress(compressed_data, compressed_size,
  92                                     uncompressed_data, uncompressed_size,
  93                                     dec->private);
  94 }
  95
  96 WIMLIBAPI void
  97 wimlib_free_decompressor(struct wimlib_decompressor *dec)
  98 {
  99         if (dec) {
 100                 if (dec->ops->free_decompressor)
 101                         dec->ops->free_decompressor(dec->private);
 102                 FREE(dec);
 103         }
 104 }