/* * 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 #include <stdint.h> /** \defgroup errflags 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); /** * \brief deliberately overlapping memcpy implementation * \param dst destination buffer; must be padded with 12 additional bytes * \param back how many bytes back we start (the initial size of the overlapping window) * \param cnt number of bytes to copy, must be >= 0 * * cnt > back is valid, this will copy the bytes we just copied, * thus creating a repeating pattern with a period length of back. */ void av_memcpy_backptr(uint8_t *dst, int back, int cnt); #endif /* AVUTIL_LZO_H */