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66 lines
2.4 KiB
66 lines
2.4 KiB
/* |
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* LZO 1x decompression |
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* copyright (c) 2006 Reimar Doeffinger |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVUTIL_LZO_H |
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#define AVUTIL_LZO_H |
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#include <stdint.h> |
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/** @defgroup errflags Error flags returned by av_lzo1x_decode |
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* \{ */ |
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//! end of the input buffer reached before decoding finished |
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#define AV_LZO_INPUT_DEPLETED 1 |
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//! decoded data did not fit into output buffer |
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#define AV_LZO_OUTPUT_FULL 2 |
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//! a reference to previously decoded data was wrong |
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#define AV_LZO_INVALID_BACKPTR 4 |
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//! a non-specific error in the compressed bitstream |
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#define AV_LZO_ERROR 8 |
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/** \} */ |
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#define AV_LZO_INPUT_PADDING 8 |
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#define AV_LZO_OUTPUT_PADDING 12 |
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/** |
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* @brief Decodes LZO 1x compressed data. |
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* @param out output buffer |
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* @param outlen size of output buffer, number of bytes left are returned here |
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* @param in input buffer |
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* @param inlen size of input buffer, number of bytes left are returned here |
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* @return 0 on success, otherwise a combination of the error flags above |
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* |
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* Make sure all buffers are appropriately padded, in must provide |
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* AV_LZO_INPUT_PADDING, out must provide AV_LZO_OUTPUT_PADDING additional bytes. |
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*/ |
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int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen); |
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/** |
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* @brief deliberately overlapping memcpy implementation |
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* @param dst destination buffer; must be padded with 12 additional bytes |
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* @param back how many bytes back we start (the initial size of the overlapping window) |
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* @param cnt number of bytes to copy, must be >= 0 |
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* |
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* cnt > back is valid, this will copy the bytes we just copied, |
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* thus creating a repeating pattern with a period length of back. |
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*/ |
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void av_memcpy_backptr(uint8_t *dst, int back, int cnt); |
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#endif /* AVUTIL_LZO_H */
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