57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/*
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* Copyright (C) 2014 Sergey Senozhatsky.
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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
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/lzo.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include "zcomp_lzo.h"
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static void *lzo_create(gfp_t flags)
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{
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void *ret;
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ret = kmalloc(LZO1X_MEM_COMPRESS, flags);
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if (!ret)
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ret = __vmalloc(LZO1X_MEM_COMPRESS,
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flags | __GFP_HIGHMEM,
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PAGE_KERNEL);
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return ret;
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}
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static void lzo_destroy(void *private)
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{
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kvfree(private);
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}
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static int lzo_compress(const unsigned char *src, unsigned char *dst,
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size_t *dst_len, void *private)
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{
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int ret = lzo1x_1_compress(src, PAGE_SIZE, dst, dst_len, private);
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return ret == LZO_E_OK ? 0 : ret;
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}
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static int lzo_decompress(const unsigned char *src, size_t src_len,
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unsigned char *dst)
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{
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size_t dst_len = PAGE_SIZE;
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int ret = lzo1x_decompress_safe(src, src_len, dst, &dst_len);
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return ret == LZO_E_OK ? 0 : ret;
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}
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struct zcomp_backend zcomp_lzo = {
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.compress = lzo_compress,
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.decompress = lzo_decompress,
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.create = lzo_create,
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.destroy = lzo_destroy,
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.name = "lzo",
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};
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