author | hgs |
Wed, 07 Jul 2010 15:08:54 +0800 | |
changeset 29 | 59aa7d6e3e0f |
parent 0 | c9bc50fca66e |
child 43 | 012cc2ee6408 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997-2010 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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#include "RequestHeader.h" |
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#include "OstTraceDefinitions.h" |
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#ifdef OST_TRACE_COMPILER_IN_USE |
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#include "RequestHeaderTraces.h" |
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#endif |
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const TDesC8& TUsbRequestHdr::Des() |
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/** |
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* This function packs the TUsbRequestHdr class into a descriptor with the |
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* correct byte alignment for transmission on the USB bus. |
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* |
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* @return Correctly-aligned buffer. NB The buffer returned is a member of |
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* this class and has the same lifetime. |
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*/ |
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{ |
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OstTraceFunctionEntry0( TUSBREQUESTHDR_DES_ENTRY ); |
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iBuffer.SetLength(KUsbRequestHdrSize); |
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iBuffer[0] = iRequestType; |
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iBuffer[1] = iRequest; |
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iBuffer[2] = static_cast<TUint8>(iValue & 0x00ff); |
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iBuffer[3] = static_cast<TUint8>((iValue & 0xff00) >> 8); |
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iBuffer[4] = static_cast<TUint8>(iIndex & 0x00ff); |
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iBuffer[5] = static_cast<TUint8>((iIndex & 0xff00) >> 8); |
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iBuffer[6] = static_cast<TUint8>(iLength & 0x00ff); |
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iBuffer[7] = static_cast<TUint8>((iLength & 0xff00) >> 8); |
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OstTraceFunctionExit0( TUSBREQUESTHDR_DES_EXIT ); |
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return iBuffer; |
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} |
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TInt TUsbRequestHdr::Decode(const TDesC8& aBuffer, TUsbRequestHdr& aTarget) |
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/** |
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* This function unpacks into the TUsbRequestHdr class from a descriptor with |
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* the alignment that would be introduced on the USB bus. |
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* |
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* @param aBuffer Input buffer |
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* @param aTarget Unpacked header. |
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* @return Error. |
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*/ |
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{ |
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OstTraceFunctionEntry0( TUSBREQUESTHDR_DECODE_ENTRY ); |
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if (aBuffer.Length() < static_cast<TInt>(KUsbRequestHdrSize)) |
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{ |
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OstTraceFunctionExit0( TUSBREQUESTHDR_DECODE_EXIT ); |
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return KErrGeneral; |
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} |
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aTarget.iRequestType = aBuffer[0]; |
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aTarget.iRequest = aBuffer[1]; |
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aTarget.iValue = static_cast<TUint16>(aBuffer[2] + (aBuffer[3] << 8)); |
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aTarget.iIndex = static_cast<TUint16>(aBuffer[4] + (aBuffer[5] << 8)); |
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aTarget.iLength = static_cast<TUint16>(aBuffer[6] + (aBuffer[7] << 8)); |
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OstTraceFunctionExit0( TUSBREQUESTHDR_DECODE_EXIT_DUP1 ); |
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return KErrNone; |
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} |
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TBool TUsbRequestHdr::IsDataResponseRequired() const |
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/** |
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* This function determines whether data is required by the host in response |
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* to a message header. |
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* @return TBool Flag indicating whether a data response required. |
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*/ |
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{ |
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OstTraceFunctionEntry0( TUSBREQUESTHDR_ISDATARESPONSEREQUIRED_ENTRY ); |
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return (iRequestType & 0x80) ? ETrue : EFalse; |
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} |
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// |
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// End of file |