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874da652b3
This only happens for a "back" value of 0 which is invalid anyway, but lcldec does not properly validate input. Also extend the documentation to specify valid values. Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/**
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* @defgroup lavu_lzo LZO
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* @ingroup lavu_crypto
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*
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* @{
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*/
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#include <stdint.h>
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/** @name 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), must be > 0
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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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* Note that lcldec currently can set back == 0 - which is wrong and
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* makes no sense, but the code should at least avoid crashing or hanging
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* for this case.
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*/
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void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
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/**
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* @}
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*/
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#endif /* AVUTIL_LZO_H */
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