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49 lines
1.3 KiB
49 lines
1.3 KiB
/*
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* Copyright (C) 2009,2011,2014 by Jonathan Naylor, G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program 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
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* GNU General Public License for more details.
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*/
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#ifndef CCITTChecksumReverse_H
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#define CCITTChecksumReverse_H
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#include <cstdint>
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/*
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* CCITT-16 checksum with reversed bit order, as required by the D-Star
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* radio header format and the DSRP network protocol.
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*
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* The API is identical to CCCITTChecksum; only the polynomial bit ordering
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* differs. This variant is used whenever a checksum is appended to or
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* verified in a D-Star header (CHeaderData, DSRP header packets, .dvtool
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* file headers, slow-data header blocks).
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*/
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class CCCITTChecksumReverse {
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public:
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CCCITTChecksumReverse();
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~CCCITTChecksumReverse();
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void update(const unsigned char* data, unsigned int length);
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void result(unsigned char* data);
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bool check(const unsigned char* data);
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void reset();
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private:
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union {
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uint16_t m_crc16;
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uint8_t m_crc8[2U];
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};
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};
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#endif
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