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/*
* lib.h - LZSA library definitions
*
* Copyright (C) 2019 Emmanuel Marty
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
/*
* Uses the libdivsufsort library Copyright (c) 2003-2008 Yuta Mori
*
* Inspired by LZ4 by Yann Collet. https://github.com/lz4/lz4
* With help, ideas, optimizations and speed measurements by spke <zxintrospec@gmail.com>
* With ideas from Lizard by Przemyslaw Skibinski and Yann Collet. https://github.com/inikep/lizard
* Also with ideas from smallz4 by Stephan Brumme. https://create.stephan-brumme.com/smallz4/
*
*/
#ifndef _LIB_H
#define _LIB_H
#include "stream.h"
#include "dictionary.h"
#include "frame.h"
#include "format.h"
#include "shrink_context.h"
#include "shrink_streaming.h"
#include "shrink_inmem.h"
#include "expand_context.h"
#include "expand_streaming.h"
#include "expand_inmem.h"
#ifdef __cplusplus
extern "C" {
#endif
/** High level status for compression and decompression */
typedef enum _lzsa_status_t {
LZSA_OK = 0, /**< Success */
LZSA_ERROR_SRC, /**< Error reading input */
LZSA_ERROR_DST, /**< Error reading output */
LZSA_ERROR_DICTIONARY, /**< Error reading dictionary */
LZSA_ERROR_MEMORY, /**< Out of memory */
/* Compression-specific status codes */
LZSA_ERROR_COMPRESSION, /**< Internal compression error */
LZSA_ERROR_RAW_TOOLARGE, /**< Input is too large to be compressed to a raw block */
LZSA_ERROR_RAW_UNCOMPRESSED, /**< Input is incompressible and raw blocks don't support uncompressed data */
/* Decompression-specific status codes */
LZSA_ERROR_FORMAT, /**< Invalid input format or magic number when decompressing */
LZSA_ERROR_DECOMPRESSION /**< Internal decompression error */
} lzsa_status_t;
/* Compression flags */
#define LZSA_FLAG_FAVOR_RATIO (1<<0) /**< 1 to compress with the best ratio, 0 to trade some compression ratio for extra decompression speed */
#define LZSA_FLAG_RAW_BLOCK (1<<1) /**< 1 to emit raw block */
#define LZSA_FLAG_RAW_BACKWARD (1<<2) /**< 1 to compress or decompress raw block backward */
/**
* Reverse bytes in the specified buffer
*
* @param pBuffer pointer to buffer whose contents are to be reversed
* @param nBufferSize size of buffer in bytes
*/
static inline void lzsa_reverse_buffer(unsigned char *pBuffer, const int nBufferSize) {
int nMidPoint = nBufferSize / 2;
int i, j;
for (i = 0, j = nBufferSize - 1; i < nMidPoint; i++, j--) {
unsigned char c = pBuffer[i];
pBuffer[i] = pBuffer[j];
pBuffer[j] = c;
}
}
#ifdef __cplusplus
}
#endif
#endif /* _LIB_H */
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