1 /* crc8.h 2 * 3 * Checks the checksum (FCS) of the 3G TS 27.010 Multiplexing protocol. 4 * The algorithm to check the FCS is described in "3G TS 27.010 V2.0.0 (1999-06)" 5 * See: www.3gpp.org/ftp/tsg_t/TSG_T/TSGT_04/docs/PDFs/TP-99119.pdf 6 * or: http://www.3gpp.org/ftp/Specs/html-info/27010.htm 7 * 8 * Polynom: (x^8 + x^2 + x^1 + 1) 9 * 10 * 2011 Hans-Christoph Schemmel <hans-christoph.schemmel[AT]cinterion.com> 11 * 2014 Philip Rosenberg-Watt <p.rosenberg-watt[at]cablelabs.com> 12 * + Added CRC-8 for IEEE 802.3 EPON, with shift register initialized to 0x00 13 * See IEEE Std 802.3-2012 Section 5, Clause 65.1.3.2.3. 14 * 15 * Wireshark - Network traffic analyzer 16 * By Gerald Combs <gerald@wireshark.org> 17 * Copyright 1998 Gerald Combs 18 * 19 * SPDX-License-Identifier: GPL-2.0-or-later 20 */ 21 22 23 /** 24 * Check the final crc value(Receiver code) 25 * 26 * \param p The tv buffer containing the data. 27 * \param len Number of bytes in the message. 28 * \param offset Offset in the message. 29 * \param received_fcs The received FCS. 30 * \return Returns TRUE if the checksum is correct, FALSE if it is not correct 31 *****************************************************************************/ 32 33 #ifndef __CRC8_TVB_H__ 34 #define __CRC8_TVB_H__ 35 36 extern gboolean check_fcs(tvbuff_t *p, guint8 len, guint8 offset, guint8 received_fcs); 37 extern guint8 get_crc8_ieee8023_epon(tvbuff_t *p, guint8 len, guint8 offset); 38 39 #endif /* __CRC8_TVB_H__ */ 40