--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/include/memmodel/epoc/mmubase/kblockmap.h	Thu Dec 17 09:24:54 2009 +0200
@@ -0,0 +1,128 @@
+// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// e32\include\memmodel\epoc\mmubase\kblockmap.h
+// Kernel-side functionality for processing block maps
+// 
+// WARNING: This file contains some APIs which are internal and are subject
+//          to change without notice. Such APIs should therefore not be used
+//          outside the Kernel and Hardware Services package.
+//
+
+#ifndef __KBLOCKMAP_H__
+#define __KBLOCKMAP_H__
+
+#include <e32ldr.h>
+
+/**
+The kernel-side representation of a block map.
+*/
+class TBlockMap
+	{
+public:
+	TBlockMap();
+	~TBlockMap();
+	
+	/**
+	Initialise and populate kernel-side representation from a user-side block map
+
+	@param aBlockMapInfo    	The user-side block map info structure.
+	
+	@param aBlockMapEntries 	Pointer to a buffer containg the user-side block map entries.
+	                            This object takes ownership of the buffer.
+	                        
+	@param aBlockMapEntriesSize The size of the user-side block map entries in bytes.
+
+	@param aReadUnitShift       Log2 of the paging device's read unit size.
+	
+	@param aDataLengthInFile 	The length of the (possibly compressed) code in the file.
+	*/
+	TInt Initialise(const SBlockMapInfoBase& aBlockMapInfo,
+					TBlockMapEntryBase* aBlockMapEntries,
+                    TInt aBlockMapEntriesSize,
+					TInt aReadUnitShift,
+					TInt aDataLengthInFile);
+
+	/**
+	A function supplied to Read that is called to read the actual data.
+	
+	@param aArg1   		An argument parameter passed to read.
+	@param aArg2   		Another argument parameter passed to read.
+	@param aBuffer 		The address of the buffer to read the data into.
+	@param aBlockNumber The block number to read.
+	@param aBlockCount 	The number of blocks to read.
+	*/
+	typedef TInt (*TReadFunc)(TAny* aArg1, TAny* aArg2, TLinAddr aBuffer, TInt aBlockNumber, TInt aBlockCount);
+
+	/**
+	Read data from the file described by the block map into a buffer.
+
+	@param aBuffer   	  The buffer into which to read the data.
+	@param aPos	   	 	  The offset from the start of the data at which to read.
+	@param aLength   	  The length of data to read in bytes.
+	@param aReadUnitShift Log2 of the paging device's read unit size.
+	@param aReadFunc 	  The function to call to read the blocks of data.
+	@param aArg1   		  An argument parameter passed to read.
+	@param aArg2   		  Another argument parameter passed to read.
+	
+	@return The offset into the buffer at which the data starts, or one of the system-wide error
+	codes.
+	*/
+	TInt Read(TLinAddr aBuffer, TInt aPos, TInt aLength, TInt aReadUnitShift, TReadFunc aReadFunc, TAny* aArg1, TAny* aArg2) const;
+
+	/**
+	A contiguous area of media containing (possibly compressed) code.
+	*/
+	struct SExtent
+		{
+		TInt iDataOffset;		// position in file from, counting from start of code data
+		TUint iBlockNumber;		// block number containg this position
+		};
+
+	inline TInt Count() const;
+	inline const SExtent& Extent(TInt aIndex) const;
+	inline TInt DataLength() const;
+
+	/**
+	Print out the contents of this object for debugging purposes.
+	This method is only implemented in debug builds.
+	*/
+	void Dump() const;
+
+private:
+	
+	TInt FindFirstExtent(TInt aPos) const;
+
+private:
+
+	TInt iDataLength;
+	TInt iExtentCount;
+	SExtent* iExtents;
+	};
+
+inline TInt TBlockMap::Count() const
+	{
+	return iExtentCount;
+	}
+
+inline const TBlockMap::SExtent& TBlockMap::Extent(TInt aIndex) const
+	{
+	return iExtents[aIndex];
+	}
+
+inline TInt TBlockMap::DataLength() const
+	{
+	return iDataLength;
+	}
+
+#endif