mirror of
https://github.com/gnuton/asuswrt-merlin.ng.git
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122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
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* Copyright (c) 2010 LG Electronics
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* Chan Jeong <chan.jeong@lge.com>
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*
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* All modifications Copyright (c) 2010
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* Phillip Lougher <phillip@lougher.demon.co.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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* lzo_wrapper.c
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <lzo/lzoconf.h>
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#include <lzo/lzo1x.h>
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#include "squashfs_fs.h"
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#include "compressor.h"
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/* worst-case expansion calculation during compression,
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see LZO FAQ for more information */
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#define LZO_OUTPUT_BUFFER_SIZE(size) (size + (size/16) + 64 + 3)
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struct lzo_stream {
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lzo_voidp wrkmem;
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lzo_bytep out;
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};
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static int squashfs_lzo_init(void **strm, int block_size, int flags)
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{
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struct lzo_stream *stream;
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if((stream = *strm = malloc(sizeof(struct lzo_stream))) == NULL)
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goto failed;
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/* work memory for compression */
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if((stream->wrkmem = malloc(LZO1X_999_MEM_COMPRESS)) == NULL)
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goto failed2;
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/* temporal output buffer */
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if((stream->out = malloc(LZO_OUTPUT_BUFFER_SIZE(block_size))) == NULL)
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goto failed3;
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return 0;
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failed3:
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free(stream->wrkmem);
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failed2:
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free(stream);
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failed:
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return -1;
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}
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static int lzo_compress(void *strm, void *d, void *s, int size, int block_size,
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int *error)
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{
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int res;
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lzo_uint outlen;
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struct lzo_stream *stream = strm;
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res = lzo1x_999_compress(s, size, stream->out, &outlen, stream->wrkmem);
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if(res != LZO_E_OK)
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goto failed;
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if(outlen >= size)
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/*
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* Output buffer overflow. Return out of buffer space
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*/
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return 0;
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/*
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* Success, return the compressed size.
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*/
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memcpy(d, stream->out, outlen);
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return outlen;
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failed:
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/*
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* All other errors return failure, with the compressor
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* specific error code in *error
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*/
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*error = res;
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return -1;
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}
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static int lzo_uncompress(void *d, void *s, int size, int block_size, int *error)
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{
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int res;
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lzo_uint bytes = block_size;
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res = lzo1x_decompress_safe(s, size, d, &bytes, NULL);
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*error = res;
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return res == LZO_E_OK ? bytes : -1;
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}
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struct compressor lzo_comp_ops = {
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.init = squashfs_lzo_init,
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.compress = lzo_compress,
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.uncompress = lzo_uncompress,
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.options = NULL,
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.usage = NULL,
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.id = LZO_COMPRESSION,
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.name = "lzo",
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.supported = 1
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};
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