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1 /* |
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2 * LZO 1x decompression |
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3 * copyright (c) 2006 Reimar Doeffinger |
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4 * |
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5 * This file is part of Libav. |
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6 * |
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7 * Libav is free software; you can redistribute it and/or |
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8 * modify it under the terms of the GNU Lesser General Public |
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9 * License as published by the Free Software Foundation; either |
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10 * version 2.1 of the License, or (at your option) any later version. |
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11 * |
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12 * Libav is distributed in the hope that it will be useful, |
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 * Lesser General Public License for more details. |
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16 * |
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17 * You should have received a copy of the GNU Lesser General Public |
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18 * License along with Libav; if not, write to the Free Software |
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 */ |
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21 |
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22 #ifndef AVUTIL_LZO_H |
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23 #define AVUTIL_LZO_H |
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24 |
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25 /** |
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26 * @defgroup lavu_lzo LZO |
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27 * @ingroup lavu_crypto |
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28 * |
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29 * @{ |
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30 */ |
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31 |
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32 #include <stdint.h> |
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33 |
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34 /** @name Error flags returned by av_lzo1x_decode |
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35 * @{ */ |
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36 /// end of the input buffer reached before decoding finished |
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37 #define AV_LZO_INPUT_DEPLETED 1 |
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38 /// decoded data did not fit into output buffer |
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39 #define AV_LZO_OUTPUT_FULL 2 |
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40 /// a reference to previously decoded data was wrong |
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41 #define AV_LZO_INVALID_BACKPTR 4 |
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42 /// a non-specific error in the compressed bitstream |
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43 #define AV_LZO_ERROR 8 |
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44 /** @} */ |
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45 |
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46 #define AV_LZO_INPUT_PADDING 8 |
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47 #define AV_LZO_OUTPUT_PADDING 12 |
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48 |
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49 /** |
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50 * @brief Decodes LZO 1x compressed data. |
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51 * @param out output buffer |
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52 * @param outlen size of output buffer, number of bytes left are returned here |
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53 * @param in input buffer |
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54 * @param inlen size of input buffer, number of bytes left are returned here |
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55 * @return 0 on success, otherwise a combination of the error flags above |
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56 * |
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57 * Make sure all buffers are appropriately padded, in must provide |
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58 * AV_LZO_INPUT_PADDING, out must provide AV_LZO_OUTPUT_PADDING additional bytes. |
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59 */ |
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60 int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen); |
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61 |
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62 /** |
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63 * @brief deliberately overlapping memcpy implementation |
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64 * @param dst destination buffer; must be padded with 12 additional bytes |
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65 * @param back how many bytes back we start (the initial size of the overlapping window) |
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66 * @param cnt number of bytes to copy, must be >= 0 |
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67 * |
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68 * cnt > back is valid, this will copy the bytes we just copied, |
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69 * thus creating a repeating pattern with a period length of back. |
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70 */ |
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71 void av_memcpy_backptr(uint8_t *dst, int back, int cnt); |
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72 |
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73 /** |
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74 * @} |
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75 */ |
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76 |
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77 #endif /* AVUTIL_LZO_H */ |