#ifndef __LZ4_H__
#define __LZ4_H__
/*
* LZ4 Kernel Interface
*
* Copyright (C) 2013, LG Electronics, Kyungsik Lee <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define LZ4_MEM_COMPRESS (4096 * sizeof(unsigned char *))
#define LZ4HC_MEM_COMPRESS (65538 * sizeof(unsigned char *))

/*
* lz4_compressbound()
* Provides the maximum size that LZ4 may output in a "worst case" scenario
* (input data not compressible)
*/
static inline size_t lz4_compressbound(size_t isize)
{
return isize + (isize / 255) + 16;
}

/*
* lz4_compress()
* src : source address of the original data
* src_len : size of the original data
* dst : output buffer address of the compressed data
* This requires 'dst' of size LZ4_COMPRESSBOUND.
* dst_len : is the output size, which is returned after compress done
* workmem : address of the working memory.
* This requires 'workmem' of size LZ4_MEM_COMPRESS.
* return : Success if return 0
* Error if return (< 0)
* note : Destination buffer and workmem must be already allocated with
* the defined size.
*/
int lz4_compress(const unsigned char *src, size_t src_len,
unsigned char *dst, size_t *dst_len, void *wrkmem);

/*
* lz4hc_compress()
* src : source address of the original data
* src_len : size of the original data
* dst : output buffer address of the compressed data
* This requires 'dst' of size LZ4_COMPRESSBOUND.
* dst_len : is the output size, which is returned after compress done
* workmem : address of the working memory.
* This requires 'workmem' of size LZ4HC_MEM_COMPRESS.
* return : Success if return 0
* Error if return (< 0)
* note : Destination buffer and workmem must be already allocated with
* the defined size.
*/
int lz4hc_compress(const unsigned char *src, size_t src_len,
unsigned char *dst, size_t *dst_len, void *wrkmem);

/*
* lz4_decompress()
* src : source address of the compressed data
* src_len : is the input size, whcih is returned after decompress done
* dest : output buffer address of the decompressed data
* actual_dest_len: is the size of uncompressed data, supposing it's known
* return : Success if return 0
* Error if return (< 0)
* note : Destination buffer must be already allocated.
* slightly faster than lz4_decompress_unknownoutputsize()
*/
int lz4_decompress(const unsigned char *src, size_t *src_len,
unsigned char *dest, size_t actual_dest_len);

/*
* lz4_decompress_unknownoutputsize()
* src : source address of the compressed data
* src_len : is the input size, therefore the compressed size
* dest : output buffer address of the decompressed data
* dest_len: is the max size of the destination buffer, which is
* returned with actual size of decompressed data after
* decompress done
* return : Success if return 0
* Error if return (< 0)
* note : Destination buffer must be already allocated.
*/
int lz4_decompress_unknownoutputsize(const unsigned char *src, size_t src_len,
unsigned char *dest, size_t *dest_len);
#endif