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Diffstat (limited to 'epan/crc16-tvb.h')
-rw-r--r-- | epan/crc16-tvb.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/epan/crc16-tvb.h b/epan/crc16-tvb.h new file mode 100644 index 0000000000..504bcd31a9 --- /dev/null +++ b/epan/crc16-tvb.h @@ -0,0 +1,94 @@ +/* crc16-tvb.h + * Declaration of CRC-16 tvbuff routines + * + * 2004 Richard van der Hoff <richardv@mxtelecom.com> + * + * $Id$ + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +*/ + +#ifndef __CRC16_TVB_H__ +#define __CRC16_TVB_H__ + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +/** Compute CRC16 CCITT checksum of a tv buffer. + @param tvb The tv buffer containing the data. + @param len The number of bytes to include in the computation. + @return The CRC16 CCITT checksum. */ +extern guint16 crc16_ccitt_tvb(tvbuff_t *tvb, guint len); + +/** Compute CRC16 X.25 CCITT checksum of a tv buffer. + @param tvb The tv buffer containing the data. + @param len The number of bytes to include in the computation. + @return The CRC16 X.25 CCITT checksum. */ +extern guint16 crc16_x25_ccitt_tvb(tvbuff_t *tvb, guint len); + +/** Compute CRC16 CCITT checksum of a tv buffer. + @param tvb The tv buffer containing the data. + @param offset The offset into the tv buffer. + @param len The number of bytes to include in the computation. + @return The CRC16 CCITT checksum. */ +extern guint16 crc16_ccitt_tvb_offset(tvbuff_t *tvb, guint offset, guint len); + +/** Compute CRC16 CCITT checksum of a tv buffer. If computing the + * checksum over multiple tv buffers and you want to feed the partial CRC16 + * back in, remember to take the 1's complement of the partial CRC16 first. + @param tvb The tv buffer containing the data. + @param len The number of bytes to include in the computation. + @param seed The seed to use. + @return The CRC16 CCITT checksum (using the given seed). */ +extern guint16 crc16_ccitt_tvb_seed(tvbuff_t *tvb, guint len, guint16 seed); + +/** Compute CRC16 CCITT checksum of a tv buffer. If computing the + * checksum over multiple tv buffers and you want to feed the partial CRC16 + * back in, remember to take the 1's complement of the partial CRC16 first. + @param tvb The tv buffer containing the data. + @param offset The offset into the tv buffer. + @param len The number of bytes to include in the computation. + @param seed The seed to use. + @return The CRC16 CCITT checksum (using the given seed). */ +extern guint16 crc16_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset, + guint len, guint16 seed); + +/** Compute the "plain" CRC16 checksum of a tv buffer using the following + * parameters: + * Width = 16 + * Poly = 0x8005 + * XorIn = 0x0000 + * ReflectIn = True + * XorOut = 0x0000 + * ReflectOut = True + * Algorithm = table-driven + * Direct = True + @param tvb The tv buffer containing the data. + @param offset The offset into the tv buffer. + @param len The number of bytes to include in the computation. + @return The CRC16 checksum. */ +extern guint16 crc16_plain_tvb_offset(tvbuff_t *tvb, guint offset, guint len); + + +#ifdef __cplusplus +} +#endif /* __cplusplus */ + +#endif /* crc16-tvb.h */ |