SQUASHFS/squashfs-tools-4.4/squashfs-tools/lzma_wrapper.c

   1 /*
   2  * Copyright (c) 2009, 2010, 2013
   3  * Phillip Lougher <phillip@squashfs.org.uk>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2,
   8  * or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  *
  19  * lzma_wrapper.c
  20  *
  21  * Support for LZMA1 compression using LZMA SDK (4.65 used in
  22  * development, other versions may work) http://www.7-zip.org/sdk.html
  23  */
  24
  25 #include <LzmaLib.h>
  26
  27 #include "squashfs_fs.h"
  28 #include "compressor.h"
  29
  30 #define LZMA_HEADER_SIZE        (LZMA_PROPS_SIZE + 8)
  31
  32 static int lzma_compress(void *strm, void *dest, void *src, int size, int block_size,
  33                 int *error)
  34 {
  35         return 0;
  36 }
  37
  38
  39 static int lzma_uncompress(void *dest, void *src, int size, int outsize,
  40         int *error)
  41 {
  42         unsigned char *s = src;
  43         size_t outlen, inlen = size - LZMA_HEADER_SIZE;
  44         int res;
  45
  46         outlen = s[LZMA_PROPS_SIZE] |
  47                 (s[LZMA_PROPS_SIZE + 1] << 8) |
  48                 (s[LZMA_PROPS_SIZE + 2] << 16) |
  49                 (s[LZMA_PROPS_SIZE + 3] << 24);
  50
  51         if(outlen > outsize) {
  52                 *error = 0;
  53                 return -1;
  54         }
  55
  56         res = LzmaUncompress(dest, &outlen, src + LZMA_HEADER_SIZE, &inlen, src,
  57                 LZMA_PROPS_SIZE);
  58
  59         if(res == SZ_OK)
  60                 return outlen;
  61         else {
  62                 *error = res;
  63                 return -1;
  64         }
  65 }
  66
  67
  68 struct compressor lzma_comp_ops = {
  69         .init = NULL,
  70         .compress = lzma_compress,
  71         .uncompress = lzma_uncompress,
  72         .options = NULL,
  73         .usage = NULL,
  74         .id = LZMA_COMPRESSION,
  75         .name = "lzma",
  76         .supported = 1
  77 };
  78