--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/euser/us_shbuf.cpp	Thu Dec 17 09:24:54 2009 +0200
@@ -0,0 +1,224 @@
+// Copyright (c) 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/euser/us_shbuf.cpp
+// Shareable Data Buffers
+
+#include "e32shbuf.h"
+#include <u32exec.h>
+#include <e32base.h>
+
+EXPORT_C TShPoolInfo::TShPoolInfo()
+	{
+	memclr(this, sizeof(TShPoolInfo));
+	}
+
+
+EXPORT_C TShPoolCreateInfo::TShPoolCreateInfo(TShPoolPageAlignedBuffers aFlag, TUint aBufSize, TUint aInitialBufs)
+	{
+	iInfo.iBufSize = aBufSize;
+	iInfo.iInitialBufs = aInitialBufs;
+	iInfo.iFlags = aFlag;
+	iInfo.iAlignment = 0;
+	SetSizingAttributes(aInitialBufs, 0,0,0);
+	}
+
+
+EXPORT_C TShPoolCreateInfo::TShPoolCreateInfo(TShPoolNonPageAlignedBuffers aFlag, TUint aBufSize, TUint aInitialBufs, TUint aAlignment)
+	{
+	iInfo.iBufSize = aBufSize;
+	iInfo.iInitialBufs = aInitialBufs;
+	iInfo.iAlignment = aAlignment;
+	iInfo.iFlags = aFlag;
+	SetSizingAttributes(aInitialBufs, 0,0,0);
+	}
+
+
+EXPORT_C TInt TShPoolCreateInfo::SetSizingAttributes(TUint aMaxBufs, TUint aGrowTriggerRatio,
+					TUint aGrowByRatio, TUint aShrinkHysteresisRatio)
+	{
+	if (aGrowTriggerRatio == 0 || aGrowByRatio == 0)	// No automatic growing/shrinking
+		{
+		aGrowTriggerRatio = aGrowByRatio = 0;
+		if (aMaxBufs != iInfo.iInitialBufs)
+			return KErrArgument;
+		}
+	else
+		{
+		// aGrowTriggerRatio must be < 1.0 (i.e. 256)
+		// aShrinkHysteresisRatio must be > 1.0
+		if (aGrowTriggerRatio >= 256 || aShrinkHysteresisRatio <= 256)
+			return KErrArgument;
+
+		if ((iInfo.iFlags & EShPoolContiguous) && (iInfo.iFlags & EShPoolNonPageAlignedBuffer))
+			return KErrNotSupported;
+		}
+
+	iInfo.iMaxBufs			= aMaxBufs;
+	iInfo.iGrowTriggerRatio	= aGrowTriggerRatio;
+	iInfo.iGrowByRatio		= aGrowByRatio;
+	iInfo.iShrinkHysteresisRatio = aShrinkHysteresisRatio;
+
+	return KErrNone;
+	}
+
+
+EXPORT_C TInt TShPoolCreateInfo::SetExclusive()
+	{
+	iInfo.iFlags |= EShPoolExclusiveAccess;
+
+	return KErrNone;
+	}
+
+
+EXPORT_C TInt TShPoolCreateInfo::SetGuardPages()
+	{
+	iInfo.iFlags |= EShPoolGuardPages;
+
+	return KErrNone;
+	}
+
+
+EXPORT_C RShPool::RShPool()
+	{
+	memclr(this, sizeof(RShPool));
+	}
+
+
+EXPORT_C TInt RShPool::Create(const TShPoolCreateInfo& aInfo, TUint aFlags)
+	{
+	return SetReturnedHandle(Exec::ShPoolCreate(aInfo.iInfo, aFlags));
+	}
+
+
+EXPORT_C void RShBuf::Close()
+	{
+	if ((iHandle!=KNullHandle) && ((iHandle & CObjectIx::ENoClose)==0))
+		{
+		iBase = 0;
+		iSize = 0;
+
+		TInt h = iHandle;
+		iHandle=0;
+		Exec::HandleClose(h);
+		}
+	}
+
+EXPORT_C void RShPool::GetInfo(TShPoolInfo& aInfo) const
+	{
+	Exec::ShPoolGetInfo(iHandle, aInfo);
+	}
+
+
+EXPORT_C TInt RShPool::SetBufferWindow(TInt aWindowSize, TBool aAutoMap)
+	{
+	return Exec::ShPoolBufferWindow(iHandle, aWindowSize, aAutoMap);
+	}
+
+
+EXPORT_C TUint RShPool::FreeCount() const
+	{
+	return Exec::ShPoolFreeCount(iHandle);
+	}
+
+
+EXPORT_C void RShPool::RequestLowSpaceNotification(TUint aThreshold, TRequestStatus& aStatus)
+	{
+	aStatus = KRequestPending;
+	Exec::ShPoolNotification(iHandle, EShPoolLowSpace, aThreshold, aStatus);
+	}
+
+
+EXPORT_C void RShPool::RequestFreeSpaceNotification(TUint aThreshold, TRequestStatus& aStatus)
+	{
+	aStatus = KRequestPending;
+	Exec::ShPoolNotification(iHandle, EShPoolFreeSpace, aThreshold, aStatus);
+	}
+
+
+EXPORT_C void RShPool::CancelLowSpaceNotification(TRequestStatus& aStatus)
+	{
+	Exec::ShPoolNotificationCancel(iHandle, EShPoolLowSpace, aStatus);
+	}
+
+
+EXPORT_C void RShPool::CancelFreeSpaceNotification(TRequestStatus& aStatus)
+	{
+	Exec::ShPoolNotificationCancel(iHandle, EShPoolFreeSpace, aStatus);
+	}
+
+
+EXPORT_C TInt RShBuf::Alloc(RShPool& aPool, TUint aFlags)
+	{
+	SShBufBaseAndSize bs;
+
+	TInt handle = Exec::ShPoolAlloc(aPool.Handle(), aFlags, bs);
+
+	TInt r = SetReturnedHandle(handle);
+
+	if (r == KErrNone)
+		{
+		iBase = bs.iBase;
+		iSize = bs.iSize;
+		}
+
+	return r;
+	}
+
+
+EXPORT_C TInt RShBuf::Map(TBool aReadOnly)
+	{
+	SShBufBaseAndSize bs;
+	TInt r = Exec::ShBufMap(iHandle, aReadOnly, bs);
+
+	if (r == KErrNone)
+		{
+	    iBase = bs.iBase;
+		iSize = bs.iSize;
+		}
+	return r;
+	}
+
+
+EXPORT_C TInt RShBuf::UnMap()
+	{
+	return Exec::ShBufUnMap(iHandle);
+	}
+
+
+EXPORT_C TUint8* RShBuf::Ptr()
+	{
+	// if iBase is null RShBuf has not been intialised
+	if (iBase == 0)
+		{
+		SShBufBaseAndSize bs;
+		Exec::ShBufBaseAndSize(iHandle, bs);
+		iBase = bs.iBase;
+		iSize = bs.iSize;
+		}
+	return reinterpret_cast<TUint8*>(iBase);
+	}
+
+
+EXPORT_C TUint RShBuf::Size()
+	{
+	// if iBase is null RShBuf has not been intialised
+	if (iBase == 0)
+		{
+		SShBufBaseAndSize bs;
+		Exec::ShBufBaseAndSize(iHandle, bs);
+		iBase = bs.iBase;
+		iSize = bs.iSize;
+		}
+	return iSize;
+	}