1/* 2 * LZO 1x decompression 3 * copyright (c) 2006 Reimar Doeffinger 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVUTIL_LZO_H 23#define AVUTIL_LZO_H 24 25#include <stdint.h> 26 27/** \defgroup errflags Error flags returned by av_lzo1x_decode 28 * \{ */ 29//! end of the input buffer reached before decoding finished 30#define AV_LZO_INPUT_DEPLETED 1 31//! decoded data did not fit into output buffer 32#define AV_LZO_OUTPUT_FULL 2 33//! a reference to previously decoded data was wrong 34#define AV_LZO_INVALID_BACKPTR 4 35//! a non-specific error in the compressed bitstream 36#define AV_LZO_ERROR 8 37/** \} */ 38 39#define AV_LZO_INPUT_PADDING 8 40#define AV_LZO_OUTPUT_PADDING 12 41 42/** 43 * \brief Decodes LZO 1x compressed data. 44 * \param out output buffer 45 * \param outlen size of output buffer, number of bytes left are returned here 46 * \param in input buffer 47 * \param inlen size of input buffer, number of bytes left are returned here 48 * \return 0 on success, otherwise a combination of the error flags above 49 * 50 * Make sure all buffers are appropriately padded, in must provide 51 * AV_LZO_INPUT_PADDING, out must provide AV_LZO_OUTPUT_PADDING additional bytes. 52 */ 53int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen); 54 55/** 56 * \brief deliberately overlapping memcpy implementation 57 * \param dst destination buffer; must be padded with 12 additional bytes 58 * \param back how many bytes back we start (the initial size of the overlapping window) 59 * \param cnt number of bytes to copy, must be >= 0 60 * 61 * cnt > back is valid, this will copy the bytes we just copied, 62 * thus creating a repeating pattern with a period length of back. 63 */ 64void av_memcpy_backptr(uint8_t *dst, int back, int cnt); 65 66#endif /* AVUTIL_LZO_H */ 67