1 /*

     2 * Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 * Library to add s32strm support for IPC (ie. stream via multiple IPC read/writes instead of

    16 * copying to a buffer and streaming to/from there.

    17 *

    18 */

    19 

    20 

    21 /**

    22  @file

    23 */

    24 #include "ipcbuf.h"

    25 

    26 

    27 EXPORT_C void RIpcBuf::Open(const RMessagePtr2& aMessage, TInt aMessageSlot)

    28 	{

    29 	iMessage = aMessage;

    30 	iMessageSlot = aMessageSlot;

    31 	iReadPos = 0;

    32 	iWritePos = 0;

    33 	}

    34 

    35 EXPORT_C TStreamPos RIpcBuf::DoSeekL(TMark aMark, TStreamLocation aLocation, TInt anOffset)

    36 	{

    37 

    38 	TInt size = iMessage.GetDesLengthL(iMessageSlot);

    39 

    40 	switch (aLocation)

    41 		{

    42 	case EStreamBeginning:

    43 		// do nothing

    44 		break;

    45 		

    46 	case EStreamMark:

    47 		if (aMark&ERead)

    48 			{

    49 			anOffset += iReadPos;

    50 			}

    51 		else if (aMark&EWrite)

    52 			{

    53 			anOffset += iWritePos;

    54 			}

    55 		break;

    56 		

    57 	case EStreamEnd:

    58 		anOffset += size;

    59 		break;

    60 		

    61 	default:

    62 		User::Panic(KIpcBufPanic, EIpcBufSeekUnknownLocation);

    63 		break;

    64 		}

    65 		

    66 	// offset can't be negative or greater than size

    67 	if (anOffset > size || anOffset < 0)

    68 		{

    69 		User::Panic(KIpcBufPanic, EIpcBufSeekBadOffset);

    70 		}

    71 		

    72 	if (aMark&ERead)

    73 		{

    74 		iReadPos = anOffset;

    75 		}

    76 	else if (aMark&EWrite)

    77 		{

    78 		iWritePos = anOffset;

    79 		}

    80 		

    81 	return TStreamPos(anOffset);

    82 	}

    83 	

    84 EXPORT_C TInt RIpcBuf::DoReadL(TAny *aPtr, TInt aMaxLength)

    85 	{

    86 	TPtr8 ptr((TUint8*)aPtr, aMaxLength);

    87 	iMessage.ReadL(iMessageSlot, ptr, iReadPos);

    88 	TInt len = ptr.Length();

    89 	iReadPos += len;

    90 	return len;

    91 	}

    92 	

    93 EXPORT_C void RIpcBuf::DoWriteL(const TAny* aPtr,TInt aLength)

    94 	{

    95 	TPtr8 ptr((TUint8*)aPtr, aLength, aLength);

    96 	iMessage.WriteL(iMessageSlot, ptr, iWritePos);

    97 	iWritePos += aLength;

    98 	}