Second try to move crc routines to libwsutil.

This time keep the tvb routines in epan.

Now we can use common crc routines outside epan.

svn path=/trunk/; revision=38810

1 files changed, 76 insertions, 0 deletions

diff --git a/wsutil/crc32.h b/wsutil/crc32.h
new file mode 100644
index 0000000000..90d77ae31f
--- /dev/null
+++ b/wsutil/crc32.h
@@ -0,0 +1,76 @@
+/* crc32.h
+ * Declaration of CRC-32 routine and table
+ *
+ * $Id$
+ *
+ * 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 __CRC32_H__
+#define __CRC32_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define CRC32_CCITT_SEED 0xFFFFFFFF
+#define CRC32C_PRELOAD 0xffffffff
+
+/*
+ * Byte swap fix contributed by Dave Wysochanski <davidw@netapp.com>.
+ */
+#define CRC32C_SWAP(crc32c_value)				\
+	(((crc32c_value & 0xff000000) >> 24)	|	\
+	 ((crc32c_value & 0x00ff0000) >>  8)	|	\
+	 ((crc32c_value & 0x0000ff00) <<  8)	|	\
+	 ((crc32c_value & 0x000000ff) << 24))
+
+#define CRC32C(c,d) (c=(c>>8)^crc32c_table[(c^(d))&0xFF])
+
+extern const guint32 crc32c_table[256];
+
+/** Compute CRC32C checksum of a buffer of data.
+ @param buf The buffer containing the data.
+ @param len The number of bytes to include in the computation.
+ @param crc The preload value for the CRC32C computation.
+ @return The CRC32C checksum. */
+extern guint32 crc32c_calculate(const void *buf, int len, guint32 crc);
+
+extern const guint32 crc32_ccitt_table[256];
+
+/** Compute CRC32 CCITT checksum of a buffer of data.
+ @param buf The buffer containing the data.
+ @param len The number of bytes to include in the computation.
+ @return The CRC32 CCITT checksum. */
+extern guint32 crc32_ccitt(const guint8 *buf, guint len);
+
+/** Compute CRC32 CCITT checksum of a buffer of data.  If computing the
+ *  checksum over multiple buffers and you want to feed the partial CRC32
+ *  back in, remember to take the 1's complement of the partial CRC32 first.
+ @param buf The buffer containing the data.
+ @param len The number of bytes to include in the computation.
+ @param seed The seed to use.
+ @return The CRC32 CCITT checksum (using the given seed). */
+extern guint32 crc32_ccitt_seed(const guint8 *buf, guint len, guint32 seed);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* crc32.h */