mirror of https://gerrit.osmocom.org/osmo-tetra
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* (C) 2011 by Holger Hans Peter Freyther
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* All Rights Reserved
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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 Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef CRC_16
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#define CRC_16
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#include <stdint.h>
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/**
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* Code to generate a CRC16-ITU-T as of the X.25 specification and
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* compatible with Linux's implementations. At least the polynom is
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* coming from the X.25 spec.
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*/
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/**
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* This is working of bits packed together. The high bits will be
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* accessed first. If you only pass one bit the array needs to contain
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* a 0xF0 instead of a 0x01. This interface is compatible with the
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* normal CRC interface (besides the length).
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*/
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uint16_t crc16_itut_bytes(uint16_t crc,
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const uint8_t *input, const int number_bits);
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/**
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* Each byte contains one bit. Calculate the CRC16-ITU-T for it.
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*/
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uint16_t crc16_itut_bits(uint16_t crc,
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const uint8_t *input, const int number_bits);
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uint16_t crc16_ccitt_bits(uint8_t *bits, unsigned int len);
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#endif
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