util/cbfstool/compress.c

   1 /*
   2  * compression handling for cbfstool
   3  *
   4  * Copyright (C) 2009 coresystems GmbH
   5  *                 written by Patrick Georgi <patrick.georgi@coresystems.de>
   6  *
   7  * Adapted from code
   8  * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>, released
   9  * under identical license terms
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; version 2 of the License.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc.
  23  */
  24
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include "common.h"
  28
  29 static int lzma_compress(char *in, int in_len, char *out, int *out_len)
  30 {
  31         return do_lzma_compress(in, in_len, out, out_len);
  32 }
  33
  34 static int lzma_decompress(char *in, int in_len, char *out, unused int out_len,
  35                                 size_t *actual_size)
  36 {
  37         return do_lzma_uncompress(out, out_len, in, in_len, actual_size);
  38 }
  39 static int none_compress(char *in, int in_len, char *out, int *out_len)
  40 {
  41         memcpy(out, in, in_len);
  42         *out_len = in_len;
  43         return 0;
  44 }
  45
  46 static int none_decompress(char *in, int in_len, char *out, unused int out_len,
  47                                 size_t *actual_size)
  48 {
  49         memcpy(out, in, in_len);
  50         if (actual_size != NULL)
  51                 *actual_size = in_len;
  52         return 0;
  53 }
  54
  55 comp_func_ptr compression_function(enum comp_algo algo)
  56 {
  57         comp_func_ptr compress;
  58         switch (algo) {
  59         case CBFS_COMPRESS_NONE:
  60                 compress = none_compress;
  61                 break;
  62         case CBFS_COMPRESS_LZMA:
  63                 compress = lzma_compress;
  64                 break;
  65         default:
  66                 ERROR("Unknown compression algorithm %d!\n", algo);
  67                 return NULL;
  68         }
  69         return compress;
  70 }
  71
  72 decomp_func_ptr decompression_function(enum comp_algo algo)
  73 {
  74         decomp_func_ptr decompress;
  75         switch (algo) {
  76         case CBFS_COMPRESS_NONE:
  77                 decompress = none_decompress;
  78                 break;
  79         case CBFS_COMPRESS_LZMA:
  80                 decompress = lzma_decompress;
  81                 break;
  82         default:
  83                 ERROR("Unknown compression algorithm %d!\n", algo);
  84                 return NULL;
  85         }
  86         return decompress;
  87 }