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diff --git a/portable/include/pcrc.h b/portable/include/pcrc.h
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+++ b/portable/include/pcrc.h
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+/*---------------------------------------------------------------------------*
+ *  pcrc.h  *
+ *                                                                           *
+ *  Copyright 2007, 2008 Nuance Communciations, Inc.                               *
+ *                                                                           *
+ *  Licensed under the Apache License, Version 2.0 (the 'License');          *
+ *  you may not use this file except in compliance with the License.         *
+ *                                                                           *
+ *  You may obtain a copy of the License at                                  *
+ *      http://www.apache.org/licenses/LICENSE-2.0                           *
+ *                                                                           *
+ *  Unless required by applicable law or agreed to in writing, software      *
+ *  distributed under the License is distributed on an 'AS IS' BASIS,        *
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * 
+ *  See the License for the specific language governing permissions and      *
+ *  limitations under the License.                                           *
+ *                                                                           *
+ *---------------------------------------------------------------------------*/
+
+#ifndef PCRC_H
+#define PCRC_H
+
+
+
+#include "PortPrefix.h"
+#include "ptypes.h"
+
+/**
+ * @addtogroup PCRCModule PCRC API functions
+ *
+ * @{
+ */
+
+/**
+ * Computes the CRC-encoding of the block of data.
+ *
+ * @param data The data on which to compute the CRC
+ * @param size the size of the data.
+ * @return the CRC of the data.
+ */
+PORTABLE_API unsigned int pcrcComputeData(const void *data, unsigned int size);
+
+
+/**
+ * Computes the CRC-encoding of a string.
+ *
+ * @param str The string for which to compute the CRC
+ * @return the CRC of the string.
+ */
+PORTABLE_API unsigned int pcrcComputeString(const LCHAR *str);
+
+
+/**
+ * Initial value to pass to the pcrcUpdateData to ensist consistency with
+ * pcrcComputeData.
+ */
+#define CRC_INITIAL_VALUE (~0U)
+
+/**
+ * Updates the CRC when adding a new byte.
+ *
+ * @param crc The initial crc value.
+ * @param data datum to append to the crc
+ * @param size the size of the data.
+ * @return the new crc value.
+ */
+PORTABLE_API unsigned int pcrcUpdateData(unsigned int crc,
+    const void * data,
+    unsigned int size);
+    
+/**
+ * @}
+ */
+
+
+#endif