mirror of
https://github.com/gnuton/asuswrt-merlin.ng.git
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112 lines
2.3 KiB
C
112 lines
2.3 KiB
C
/*
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* Copyright (c) 2009, 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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* gzip_wrapper.c
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*/
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#include <stdlib.h>
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#include <zlib.h>
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#include "squashfs_fs.h"
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#include "compressor.h"
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static int gzip_init(void **strm, int block_size, int flags)
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{
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int res;
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z_stream *stream;
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stream = *strm = malloc(sizeof(z_stream));
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if(stream == NULL)
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goto failed;
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stream->zalloc = Z_NULL;
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stream->zfree = Z_NULL;
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stream->opaque = 0;
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res = deflateInit(stream, 9);
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if(res != Z_OK)
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goto failed2;
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return 0;
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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 gzip_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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z_stream *stream = strm;
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res = deflateReset(stream);
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if(res != Z_OK)
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goto failed;
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stream->next_in = s;
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stream->avail_in = size;
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stream->next_out = d;
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stream->avail_out = block_size;
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res = deflate(stream, Z_FINISH);
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if(res == Z_STREAM_END)
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/*
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* Success, return the compressed size.
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*/
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return (int) stream->total_out;
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if(res == Z_OK)
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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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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 gzip_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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unsigned long bytes = block_size;
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res = uncompress(d, &bytes, s, size);
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*error = res;
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return res == Z_OK ? (int) bytes : -1;
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}
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struct compressor gzip_comp_ops = {
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.init = gzip_init,
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.compress = gzip_compress,
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.uncompress = gzip_uncompress,
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.options = NULL,
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.usage = NULL,
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.id = ZLIB_COMPRESSION,
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.name = "gzip",
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.supported = 1
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};
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