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78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* Copyright (c) 2009, 2010, 2013
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* Phillip Lougher <phillip@squashfs.org.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* lzma_wrapper.c
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*
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* Support for LZMA1 compression using LZMA SDK (4.65 used in
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* development, other versions may work) http://www.7-zip.org/sdk.html
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*/
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#include <LzmaLib.h>
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#include "squashfs_fs.h"
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#include "compressor.h"
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#define LZMA_HEADER_SIZE (LZMA_PROPS_SIZE + 8)
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static int lzma_compress(void *strm, void *dest, void *src, int size, int block_size,
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int *error)
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{
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return 0;
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}
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static int lzma_uncompress(void *dest, void *src, int size, int outsize,
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int *error)
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{
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unsigned char *s = src;
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size_t outlen, inlen = size - LZMA_HEADER_SIZE;
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int res;
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outlen = s[LZMA_PROPS_SIZE] |
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(s[LZMA_PROPS_SIZE + 1] << 8) |
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(s[LZMA_PROPS_SIZE + 2] << 16) |
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(s[LZMA_PROPS_SIZE + 3] << 24);
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if(outlen > outsize) {
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*error = 0;
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return -1;
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}
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res = LzmaUncompress(dest, &outlen, src + LZMA_HEADER_SIZE, &inlen, src,
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LZMA_PROPS_SIZE);
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if(res == SZ_OK)
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return outlen;
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else {
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*error = res;
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return -1;
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}
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}
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struct compressor lzma_comp_ops = {
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.init = NULL,
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.compress = lzma_compress,
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.uncompress = lzma_uncompress,
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.options = NULL,
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.usage = NULL,
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.id = LZMA_COMPRESSION,
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.name = "lzma",
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.supported = 1
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};
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