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47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/*
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* This file is part of Cleanflight and Betaflight.
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*
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* Cleanflight and Betaflight are free software. You can redistribute
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* this software and/or modify this software under the terms of the
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* GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option)
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* any later version.
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*
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* Cleanflight and Betaflight are distributed in the hope that they
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software.
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*
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdint.h>
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#define HUFFMAN_TABLE_SIZE 257 // 256 characters plus EOF
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typedef struct huffmanTable_s {
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uint8_t codeLen;
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uint16_t code;
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} huffmanTable_t;
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typedef struct huffmanState_s {
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uint16_t bytesWritten;
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uint8_t *outByte;
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uint16_t outBufLen;
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uint8_t outBit;
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} huffmanState_t;
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extern const huffmanTable_t huffmanTable[HUFFMAN_TABLE_SIZE];
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struct huffmanInfo_s {
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uint16_t uncompressedByteCount;
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};
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#define HUFFMAN_INFO_SIZE sizeof(struct huffmanInfo_s)
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int huffmanEncodeBuf(uint8_t *outBuf, int outBufLen, const uint8_t *inBuf, int inLen, const huffmanTable_t *huffmanTable);
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int huffmanEncodeBufStreaming(huffmanState_t *state, const uint8_t *inBuf, int inLen, const huffmanTable_t *huffmanTable);
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