--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/spandsp/crc.h	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,98 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * crc.h
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2003 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1,
+ * as published by the Free Software Foundation.
+ *
+ * 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: crc.h,v 1.5 2009/01/31 08:48:11 steveu Exp $
+ */
+
+/*! \file */
+
+/*! \page crc_page CRC
+
+\section crc_page_sec_1 What does it do?
+
+\section crc_page_sec_2 How does it work?
+*/
+
+#if !defined(_SPANDSP_CRC_H_)
+#define _SPANDSP_CRC_H_
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+/*! \brief Calculate the ITU/CCITT CRC-32 value in buffer.
+    \param buf The buffer containing the data.
+    \param len The length of the frame.
+    \param crc The initial CRC value. This is usually 0xFFFFFFFF, or 0 for a new block (it depends on
+           the application). It is previous returned CRC value for the continuation of a block.
+    \return The CRC value.
+*/
+SPAN_DECLARE(uint32_t) crc_itu32_calc(const uint8_t *buf, int len, uint32_t crc);
+
+/*! \brief Append an ITU/CCITT CRC-32 value to a frame.
+    \param buf The buffer containing the frame. This must be at least 2 bytes longer than
+               the frame it contains, to allow room for the CRC value.
+    \param len The length of the frame.
+    \return The new length of the frame.
+*/
+SPAN_DECLARE(int) crc_itu32_append(uint8_t *buf, int len);
+
+/*! \brief Check the ITU/CCITT CRC-32 value in a frame.
+    \param buf The buffer containing the frame.
+    \param len The length of the frame.
+    \return TRUE if the CRC is OK, else FALSE.
+*/
+SPAN_DECLARE(int) crc_itu32_check(const uint8_t *buf, int len);
+
+/*! \brief Calculate the ITU/CCITT CRC-16 value in buffer.
+    \param buf The buffer containing the data.
+    \param len The length of the frame.
+    \param crc The initial CRC value. This is usually 0xFFFF, or 0 for a new block (it depends on
+           the application). It is previous returned CRC value for the continuation of a block.
+    \return The CRC value.
+*/
+SPAN_DECLARE(uint16_t) crc_itu16_calc(const uint8_t *buf, int len, uint16_t crc);
+
+/*! \brief Append an ITU/CCITT CRC-16 value to a frame.
+    \param buf The buffer containing the frame. This must be at least 2 bytes longer than
+               the frame it contains, to allow room for the CRC value.
+    \param len The length of the frame.
+    \return The new length of the frame.
+*/
+SPAN_DECLARE(int) crc_itu16_append(uint8_t *buf, int len);
+
+/*! \brief Check the ITU/CCITT CRC-16 value in a frame.
+    \param buf The buffer containing the frame.
+    \param len The length of the frame.
+    \return TRUE if the CRC is OK, else FALSE.
+*/
+SPAN_DECLARE(int) crc_itu16_check(const uint8_t *buf, int len);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+/*- End of file ------------------------------------------------------------*/