Add crc7 calculation abillity.

svn path=/trunk/; revision=43680

1 files changed, 92 insertions, 0 deletions

diff --git a/wsutil/crc7.h b/wsutil/crc7.h
new file mode 100644
index 0000000000..e9104b37b0
--- /dev/null
+++ b/wsutil/crc7.h
@@ -0,0 +1,92 @@
+/*
+ * crc7.h
+ *  
+ * $Id$
+ *
+ * Functions and types for CRC checks.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Generated on Wed Jul 11 17:24:57 2012,
+ * by pycrc v0.7.10, http://www.tty1.net/pycrc/
+ * using the configuration:
+ *    Width        = 7
+ *    Poly         = 0x45
+ *    XorIn        = 0x00
+ *    ReflectIn    = False
+ *    XorOut       = 0x00
+ *    ReflectOut   = False
+ *    Algorithm    = table-driven
+ ****************************************************************************
+ */
+#ifndef __CRC7__H__
+#define __CRC7__H__
+
+#include <stdlib.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * The definition of the used algorithm.
+ *****************************************************************************/
+#define CRC_ALGO_TABLE_DRIVEN 1
+
+/**
+ * Calculate the initial crc value.
+ *
+ * \return     The initial crc value.
+ *****************************************************************************/
+static inline guint8 crc7init(void)
+{
+    return 0x00 << 1;
+}
+
+
+/**
+ * Update the crc value with new data.
+ *
+ * \param crc      The current crc value.
+ * \param data     Pointer to a buffer of \a data_len bytes.
+ * \param data_len Number of bytes in the \a data buffer.
+ * \return         The updated crc value.
+ *****************************************************************************/
+extern guint8 crc7update(guint8 crc, const unsigned char *data, int data_len);
+
+
+/**
+ * Calculate the final crc value.
+ *
+ * \param crc  The current crc value.
+ * \return     The final crc value.
+ *****************************************************************************/
+static inline guint8 crc7finalize(guint8 crc)
+{
+    return (crc >> 1) ^ 0x00;
+}
+
+
+#ifdef __cplusplus
+}           /* closing brace for extern "C" */
+#endif
+
+#endif      /* __CRC7__H__ */