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diff --git a/portable/include/PFileImpl.h b/portable/include/PFileImpl.h
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+/*---------------------------------------------------------------------------*
+ *  PFileImpl.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 __PFILEIMPL_H
+#define __PFILEIMPL_H
+
+
+
+#include "PFile.h"
+#include "ptrd.h"
+
+/**
+ * Portable file implementation.
+ */
+typedef struct PFileImpl_t
+{
+  /**
+   * Interface functions that must be implemented.
+   */
+  PFile Interface;
+  
+  /**
+   * File name relative to the file-system path.
+   */
+  LCHAR* filename;
+  
+  /**
+   * True if file is in little endian format.
+   */
+  ESR_BOOL littleEndian;
+  
+#ifdef USE_THREAD
+  /**
+   * Used to lock underlying file and provide atomic read/write operations.
+   */
+  PtrdMonitor* lock;
+#endif
+}
+PFileImpl;
+
+/**
+ * Initializes variables declared in the superinterface.
+ *
+ * @param self PFile handle
+ * @param filename Name of the file
+ * @param littleEndian True if file is little-endian
+ * @return ESR_OUT_OF_MEMORY if system is out of memory
+ */
+PORTABLE_API ESR_ReturnCode PFileCreateImpl(PFile* self, const LCHAR* filename, ESR_BOOL littleEndian);
+
+/**
+ * Default implementation.
+ */
+PORTABLE_API ESR_ReturnCode PFileDestroyImpl(PFile* self);
+
+/**
+ * Default implementation.
+ */
+PORTABLE_API ESR_ReturnCode PFileGetFilenameImpl(PFile* self, LCHAR* filename, size_t* len);
+
+/**
+ * Default implementation.
+ */
+PORTABLE_API ESR_ReturnCode PFileVfprintfImpl(PFile* self, int* result, const LCHAR* format, va_list args);
+
+#endif /* __PFILEIMPL_H */