author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 17:01:47 +0300 | |
branch | RCL_3 |
changeset 15 | f92a4f87e424 |
parent 0 | c9bc50fca66e |
child 16 | 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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|
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#include "AcmWriter.h" |
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#include "AcmPort.h" |
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#include "AcmPanic.h" |
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#include "AcmUtils.h" |
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#include "OstTraceDefinitions.h" |
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#ifdef OST_TRACE_COMPILER_IN_USE |
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#include "AcmWriterTraces.h" |
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#endif |
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CAcmWriter* CAcmWriter::NewL(CAcmPort& aPort, |
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TUint aBufSize) |
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/** |
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* Factory function. |
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* |
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* @param aPort Owning CAcmPort object. |
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* @param aBufSize Required buffer size. |
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* @return Ownership of a newly created CAcmWriter object |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_NEWL_ENTRY ); |
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CAcmWriter* self = new(ELeave) CAcmWriter(aPort, aBufSize); |
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CleanupStack::PushL(self); |
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self->ConstructL(); |
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CLEANUPSTACK_POP(self); |
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OstTraceFunctionExit0( CACMWRITER_NEWL_EXIT ); |
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return self; |
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} |
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CAcmWriter::~CAcmWriter() |
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/** |
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* Destructor. |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_CACMWRITER_DES_ENTRY ); |
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WriteCancel(); |
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delete iBuffer; |
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OstTraceFunctionExit0( CACMWRITER_CACMWRITER_DES_EXIT ); |
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} |
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void CAcmWriter::Write(const TAny* aClientBuffer, TUint aLength) |
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/** |
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* Queue a write. |
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* |
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* @param aClientBuffer pointer to the Client's buffer |
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* @param aLength Number of bytes to write |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_WRITE_ENTRY ); |
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OstTraceExt2( TRACE_NORMAL, CACMWRITER_WRITE, "CAcmWriter::Write;aClientBuffer=%p;aLength=%d", aClientBuffer, (TInt)aLength ); |
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// Check we're open to requests and make a note of interesting data. |
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CheckNewRequest(aClientBuffer, aLength); |
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// If the write size greater than the current buffer size then the |
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// request will now complete over multiple operations. (This used to |
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// simply reject the write request with KErrNoMemory) |
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// Get as much data as we can from the client into our buffer |
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ReadDataFromClient(); |
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// ...and write as much as we've got to the LDD |
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IssueWrite(); |
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OstTraceFunctionExit0( CACMWRITER_WRITE_EXIT ); |
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} |
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void CAcmWriter::WriteCancel() |
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/** |
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* Cancel a write. |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_WRITECANCEL_ENTRY ); |
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// Cancel any outstanding request on the LDD. |
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if ( iPort.Acm() ) |
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{ |
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OstTrace0( TRACE_NORMAL, CACMWRITER_WRITECANCEL, "CAcmWriter::WriteCancel;\tiPort.Acm() exists- calling WriteCancel on it" ); |
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iPort.Acm()->WriteCancel(); |
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} |
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// Reset our flag to say there's no current outstanding request. What's |
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// already in our buffer can stay there. |
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iCurrentRequest.iClientPtr = NULL; |
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OstTraceFunctionExit0( CACMWRITER_WRITECANCEL_EXIT ); |
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} |
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void CAcmWriter::ResetBuffer() |
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/** |
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* Called by the port to clear the buffer. |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_RESETBUFFER_ENTRY ); |
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// A request is outstanding- C32 should protect against this. |
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108 |
|
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if (iCurrentRequest.iClientPtr != NULL) |
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110 |
{ |
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OstTrace1( TRACE_FATAL, CACMWRITER_RESETBUFFER, |
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"CAcmWriter::ResetBuffer;EPanicInternalError=%d", |
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(TInt)EPanicInternalError ); |
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__ASSERT_DEBUG( EFalse, User::Panic(KAcmPanicCat, EPanicInternalError) ); |
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} |
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// Don't have anything to do. There are no pointers to reset. This |
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// function may in the future (if we support KConfigWriteBufferedComplete) |
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// do work, so leave the above assertion in. |
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OstTraceFunctionExit0( CACMWRITER_RESETBUFFER_EXIT ); |
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} |
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121 |
|
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TInt CAcmWriter::SetBufSize(TUint aSize) |
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/** |
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* Called by the port to set the buffer size. Also used as a utility by us to |
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* create the buffer at instantiation. |
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* |
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* @param aSize The required size of the buffer. |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_SETBUFSIZE_ENTRY ); |
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OstTrace1( TRACE_NORMAL, CACMWRITER_SETBUFSIZE, "CAcmWriter::SetBufSize;aSize=%d", (TInt)aSize ); |
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132 |
|
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if ( iCurrentRequest.iClientPtr ) |
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134 |
{ |
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// A request is outstanding. C32 does not protect us against this. |
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OstTrace0( TRACE_NORMAL, CACMWRITER_SETBUFSIZE_DUP1, |
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"CAcmWriter::SetBufSize;\t***a request is outstanding- returning KErrInUse" ); |
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OstTraceFunctionExit0( CACMWRITER_SETBUFSIZE_EXIT ); |
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return KErrInUse; |
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} |
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141 |
|
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// Create the new buffer. |
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HBufC8* newBuf = HBufC8::New(static_cast<TInt>(aSize)); |
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if ( !newBuf ) |
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{ |
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OstTrace0( TRACE_NORMAL, CACMWRITER_SETBUFSIZE_DUP2, |
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"CAcmWriter::SetBufSize;\tfailed to create new buffer- returning KErrNoMemory" ); |
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OstTraceFunctionExit0( CACMWRITER_SETBUFSIZE_EXIT_DUP1 ); |
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return KErrNoMemory; |
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} |
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delete iBuffer; |
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iBuffer = newBuf; |
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iBuf.Set(iBuffer->Des()); |
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iBufSize = aSize; |
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|
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OstTraceFunctionExit0( CACMWRITER_SETBUFSIZE_EXIT_DUP2 ); |
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return KErrNone; |
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} |
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159 |
|
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CAcmWriter::CAcmWriter(CAcmPort& aPort, |
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TUint aBufSize) |
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/** |
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* Constructor. |
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* |
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* @param aPort The CPort parent. |
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* @param aBufSize The size of the buffer. |
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*/ |
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: iBufSize(aBufSize), |
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iBuf(NULL,0,0), |
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iPort(aPort) |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_CACMWRITER_CONS_ENTRY ); |
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OstTraceFunctionExit0( CACMWRITER_CACMWRITER_CONS_EXIT ); |
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} |
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175 |
|
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void CAcmWriter::ConstructL() |
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/** |
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* 2nd-phase constructor. |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_CONSTRUCTL_ENTRY ); |
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// Create the required buffer. |
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OstTrace0( TRACE_NORMAL, CACMWRITER_CONSTRUCTL, "CAcmWriter::ConstructL;\tabout to create iBuffer" ); |
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TInt err = SetBufSize(iBufSize); |
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if (err < 0) |
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{ |
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OstTrace1( TRACE_ERROR, CACMWRITER_CONSTRUCTL_DUP1, "CAcmWriter::ConstructL;err=%d", err ); |
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User::Leave(err); |
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} |
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OstTraceFunctionExit0( CACMWRITER_CONSTRUCTL_EXIT ); |
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} |
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|
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void CAcmWriter::WriteCompleted(TInt aError) |
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/** |
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* This function is called when a write on the LDD has completed. |
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* This checks whether any data remains to be written, if so the |
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* read and write requests are re-issued until there in no data |
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* left or an error occurs. |
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* |
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* @param aError Error with which the write completed. |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_WRITECOMPLETED_ENTRY ); |
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OstTrace1( TRACE_NORMAL, CACMWRITER_WRITECOMPLETED, "CAcmWriter::WriteCompleted;aError=%d", (TInt)aError ); |
0
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if(iLengthToGo == 0 || aError != KErrNone) |
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{ |
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OstTrace1( TRACE_NORMAL, CACMWRITER_WRITECOMPLETED_DUP1, |
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"CAcmWriter::WriteCompleted;\tcompleting request with %d", aError ); |
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CompleteRequest(aError); |
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} |
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else |
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{ |
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//there is some data remaining to be read so reissue the Read & Write |
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//requests until there is no data left. |
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ReadDataFromClient(); |
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IssueWrite(); |
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} |
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OstTraceFunctionExit0( CACMWRITER_WRITECOMPLETED_EXIT ); |
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} |
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|
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void CAcmWriter::ReadDataFromClient() |
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/** |
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* Read data from the client space into the internal buffer, prior to writing. |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_READDATAFROMCLIENT_ENTRY ); |
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TPtr8 ptr((TUint8*)iBuf.Ptr(), |
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0, |
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Min(iBuf.MaxLength(), iLengthToGo)); |
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|
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TInt err = iPort.IPCRead(iCurrentRequest.iClientPtr, |
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ptr, |
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static_cast<TInt>(iOffsetIntoClientsMemory)); |
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OstTrace1( TRACE_NORMAL, CACMWRITER_READDATAFROMCLIENT, "CAcmWriter::ReadDataFromClient;\tIPCRead = %d", err ); |
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|
0
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iBuf.SetLength(ptr.Length()); |
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if (err != 0) |
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{ |
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OstTrace1( TRACE_FATAL, CACMWRITER_READDATAFROMCLIENT_DUP1, |
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"CAcmWriter::ReadDataFromClient;EPanicInternalError=%d", |
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(TInt)EPanicInternalError ); |
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__ASSERT_DEBUG( EFalse, User::Panic(KAcmPanicCat, EPanicInternalError) ); |
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} |
0
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static_cast<void>(err); |
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// Increase our pointer (into the client's space) of already-read data. |
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iOffsetIntoClientsMemory += iBuf.Length(); |
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OstTraceFunctionExit0( CACMWRITER_READDATAFROMCLIENT_EXIT ); |
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} |
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|
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|
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|
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void CAcmWriter::CheckNewRequest(const TAny* aClientBuffer, TUint aLength) |
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/** |
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* Utility function to check a new request from the port. |
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* Also checks that there isn't a request already outstanding. Makes a note of |
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* the relevant parameters and sets up internal counters. |
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* |
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* @param aClientBuffer Pointer to the client's memory space. |
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* @param aLength Length to write. |
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*/ |
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261 |
{ |
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OstTraceFunctionEntry0( CACMWRITER_CHECKNEWREQUEST_ENTRY ); |
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263 |
|
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if (aLength > static_cast<TUint>(KMaxTInt)) |
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{ |
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OstTrace1( TRACE_FATAL, CACMWRITER_CHECKNEWREQUEST, |
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"CAcmWriter::CheckNewRequest;aLength > static_cast<TUint>(KMaxTInt), EPanicInternalError=%d", |
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(TInt)EPanicInternalError ); |
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__ASSERT_DEBUG( EFalse, User::Panic(KAcmPanicCat, EPanicInternalError) ); |
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} |
0
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// Check we have no outstanding request already. |
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if ( iCurrentRequest.iClientPtr ) |
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{ |
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OstTrace1( TRACE_FATAL, CACMWRITER_CHECKNEWREQUEST_DUP1, |
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"CAcmWriter::CheckNewRequest;iCurrentRequest.iClientPtr != NULL, EPanicInternalError=%d", |
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(TInt)EPanicInternalError ); |
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__ASSERT_DEBUG( EFalse, User::Panic(KAcmPanicCat, EPanicInternalError) ); |
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} |
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// Sanity check on what C32 gave us. |
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if (aClientBuffer == NULL) |
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{ |
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OstTrace1( TRACE_FATAL, CACMWRITER_CHECKNEWREQUEST_DUP2, |
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"CAcmWriter::CheckNewRequest;aClientBuffer == NULL, EPanicInternalError=%d", |
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(TInt)EPanicInternalError ); |
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__ASSERT_DEBUG( EFalse, User::Panic(KAcmPanicCat, EPanicInternalError) ); |
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286 |
} |
0
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// Make a note of interesting data. |
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iCurrentRequest.iLength = aLength; |
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iCurrentRequest.iClientPtr = aClientBuffer; |
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290 |
|
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iLengthToGo = aLength; |
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iOffsetIntoClientsMemory = 0; |
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OstTraceFunctionExit0( CACMWRITER_CHECKNEWREQUEST_EXIT ); |
0
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} |
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295 |
|
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void CAcmWriter::CompleteRequest(TInt aError) |
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/** |
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* Utility to reset our 'outstanding request' flag and complete the client's |
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* request back to them. |
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* |
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* @param aError The error code to complete with. |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_COMPLETEREQUEST_ENTRY ); |
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OstTrace1( TRACE_NORMAL, CACMWRITER_COMPLETEREQUEST, |
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"CAcmWriter::CompleteRequest;CAcmWriter::CompleteRequest aError=%d", (TInt)aError ); |
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0
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// Set our flag to say that we no longer have an outstanding request. |
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iCurrentRequest.iClientPtr = NULL; |
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OstTrace1( TRACE_NORMAL, CACMWRITER_COMPLETEREQUEST_DUP1, |
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"CAcmWriter::CompleteRequest;\tcalling WriteCompleted with %d", aError ); |
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0
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iPort.WriteCompleted(aError); |
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OstTraceFunctionExit0( CACMWRITER_COMPLETEREQUEST_EXIT ); |
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} |
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|
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void CAcmWriter::IssueWrite() |
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/** |
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* Writes a batch of data from our buffer to the LDD. Currently writes the |
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* entire load of buffered data in one go. |
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*/ |
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{ |
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OstTraceFunctionEntry0( CACMWRITER_ISSUEWRITE_ENTRY ); |
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OstTrace1( TRACE_NORMAL, CACMWRITER_ISSUEWRITE, "CAcmWriter::IssueWrite;\tissuing Write of %d bytes", (TInt)(iBuf.Length()) ); |
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if (iPort.Acm() == NULL) |
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{ |
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OstTrace1( TRACE_FATAL, CACMWRITER_ISSUEWRITE_DUP1, |
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"CAcmWriter::IssueWrite;EPanicInternalError=%d", (TInt)EPanicInternalError); |
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__ASSERT_DEBUG( EFalse, User::Panic(KAcmPanicCat, EPanicInternalError) ); |
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} |
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iPort.Acm()->Write(*this, |
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iBuf, |
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iBuf.Length()); |
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|
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#ifdef DEBUG |
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// A Zero Length Packet is an acceptable packet so iBuf.Length == 0 is acceptable, |
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// if we receive this and the request length > 0 then we may have a problem so check |
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// that the LengthToGo is also 0, if it is not then we may end up looping through this |
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// code until a driver write error occurs which may never happen. |
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// This is not expected to occur but the test is in here just to be safe. |
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if(iBuf.Length() == 0 && iCurrentRequest.Length() != 0 && iLengthToGo != 0) |
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{ |
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OstTrace1( TRACE_FATAL, CACMWRITER_ISSUEWRITE_DUP2, |
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"CAcmWriter::IssueWrite;EPanicInternalError=%d", (TInt)EPanicInternalError); |
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__ASSERT_DEBUG( EFalse, User::Panic(KAcmPanicCat, EPanicInternalError) ); |
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} |
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#endif |
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// Update our counter of remaining data to write. |
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iLengthToGo -= iBuf.Length(); |
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OstTraceFunctionExit0( CACMWRITER_ISSUEWRITE_EXIT ); |
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} |
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|
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// |
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// End of file |