lzo.h 2.42 KB
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/*
 * LZO 1x decompression
 * copyright (c) 2006 Reimar Doeffinger
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVUTIL_LZO_H
#define AVUTIL_LZO_H

/**
 * @defgroup lavu_lzo LZO
 * @ingroup lavu_crypto
 *
 * @{
 */

#include <stdint.h>

/** @name Error flags returned by av_lzo1x_decode
 * @{ */
/// end of the input buffer reached before decoding finished
#define AV_LZO_INPUT_DEPLETED  1
/// decoded data did not fit into output buffer
#define AV_LZO_OUTPUT_FULL     2
/// a reference to previously decoded data was wrong
#define AV_LZO_INVALID_BACKPTR 4
/// a non-specific error in the compressed bitstream
#define AV_LZO_ERROR           8
/** @} */

#define AV_LZO_INPUT_PADDING   8
#define AV_LZO_OUTPUT_PADDING 12

/**
 * @brief Decodes LZO 1x compressed data.
 * @param out output buffer
 * @param outlen size of output buffer, number of bytes left are returned here
 * @param in input buffer
 * @param inlen size of input buffer, number of bytes left are returned here
 * @return 0 on success, otherwise a combination of the error flags above
 *
 * Make sure all buffers are appropriately padded, in must provide
 * AV_LZO_INPUT_PADDING, out must provide AV_LZO_OUTPUT_PADDING additional bytes.
 */
int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen);

/**
 * @}
 */

#define FFMAX(x,y) ({ typeof(x) _x = (x) ; typeof(y) _y = (y);	\
			_x > _y ? _x : _y; })

struct lzo_packed_uint32 {
	uint32_t d;
} __attribute__((packed));

#define AV_COPY32U(dst,src) do {			\
		((struct lzo_packed_uint32 *)dst)->d = \
			((struct lzo_packed_uint32 *)src)->d; \
	} while (0)

static inline void av_memcpy_backptr(unsigned char *dst, int back, int cnt)
{
	while (cnt--) {
		*dst = *(dst - back);
		dst++;
	}
}

#endif /* AVUTIL_LZO_H */