| /* |
| * Copyright (c) 2010 LG Electronics |
| * Chan Jeong <chan.jeong@lge.com> |
| * |
| * All modifications Copyright (c) 2010 |
| * Phillip Lougher <phillip@squashfs.org.uk> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2, |
| * or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| * lzo_wrapper.c |
| */ |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <lzo/lzoconf.h> |
| #include <lzo/lzo1x.h> |
| |
| #include "squashfs_fs.h" |
| #include "compressor.h" |
| |
| /* worst-case expansion calculation during compression, |
| see LZO FAQ for more information */ |
| #define LZO_OUTPUT_BUFFER_SIZE(size) (size + (size/16) + 64 + 3) |
| |
| struct lzo_stream { |
| lzo_voidp wrkmem; |
| lzo_bytep out; |
| }; |
| |
| |
| static int squashfs_lzo_init(void **strm, int block_size, int flags) |
| { |
| struct lzo_stream *stream; |
| |
| if((stream = *strm = malloc(sizeof(struct lzo_stream))) == NULL) |
| goto failed; |
| /* work memory for compression */ |
| if((stream->wrkmem = malloc(LZO1X_999_MEM_COMPRESS)) == NULL) |
| goto failed2; |
| /* temporal output buffer */ |
| if((stream->out = malloc(LZO_OUTPUT_BUFFER_SIZE(block_size))) == NULL) |
| goto failed3; |
| |
| return 0; |
| |
| failed3: |
| free(stream->wrkmem); |
| failed2: |
| free(stream); |
| failed: |
| return -1; |
| } |
| |
| |
| static int lzo_compress(void *strm, void *d, void *s, int size, int block_size, |
| int *error) |
| { |
| int res; |
| lzo_uint outlen; |
| struct lzo_stream *stream = strm; |
| |
| res = lzo1x_999_compress(s, size, stream->out, &outlen, stream->wrkmem); |
| if(res != LZO_E_OK) |
| goto failed; |
| if(outlen >= size) |
| /* |
| * Output buffer overflow. Return out of buffer space |
| */ |
| return 0; |
| |
| /* |
| * Success, return the compressed size. |
| */ |
| memcpy(d, stream->out, outlen); |
| return outlen; |
| |
| failed: |
| /* |
| * All other errors return failure, with the compressor |
| * specific error code in *error |
| */ |
| *error = res; |
| return -1; |
| } |
| |
| |
| static int lzo_uncompress(void *d, void *s, int size, int block_size, int *error) |
| { |
| int res; |
| lzo_uint bytes = block_size; |
| |
| res = lzo1x_decompress_safe(s, size, d, &bytes, NULL); |
| |
| *error = res; |
| return res == LZO_E_OK ? bytes : -1; |
| } |
| |
| |
| struct compressor lzo_comp_ops = { |
| .init = squashfs_lzo_init, |
| .compress = lzo_compress, |
| .uncompress = lzo_uncompress, |
| .options = NULL, |
| .usage = NULL, |
| .id = LZO_COMPRESSION, |
| .name = "lzo", |
| .supported = 1 |
| }; |
| |