author | Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com> |
Mon, 30 Mar 2009 12:54:55 +0300 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005 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 the License "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: A base class to serialize objects between clients and the server. |
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* |
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*/ |
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#include "Logger.h" |
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#include "Packed.h" |
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#include "PackedAttributes.h" |
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// ----------------------------------------------------------------------------- |
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// CPacked::CPacked |
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// |
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// C++ default constructor can NOT contain any code, that |
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// might leave. |
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// ----------------------------------------------------------------------------- |
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// |
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CPacked::CPacked(TInt aTokenArrayInc, TInt aStringTableInc): |
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KTokenArrayInc(aTokenArrayInc), KStringTableInc(aStringTableInc) |
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{ |
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} |
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// ----------------------------------------------------------------------------- |
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// CPacked::ConstructL |
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// |
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// Symbian 2nd phase constructor can leave. |
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// ----------------------------------------------------------------------------- |
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// |
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void CPacked::BaseConstructL() |
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{ |
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iStringTable = HBufC::NewL(KStringTableInc); |
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} |
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// ----------------------------------------------------------------------------- |
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// CPacked::~CPacked |
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// |
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// Deconstructor. |
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// ----------------------------------------------------------------------------- |
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// |
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CPacked::~CPacked() |
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{ |
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delete iTokenArray; |
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delete iStringTable; |
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} |
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// ----------------------------------------------------------------------------- |
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// CPacked::AddAttributeL |
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// |
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// Insert an attribute. This attribute is applied to the enclosing entity |
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// (Feed, Item, Enclosure, folder, etc.). |
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// ----------------------------------------------------------------------------- |
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// |
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void CPacked::AddAttributeL(TInt aAttribute, const TDesC& aValue) |
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{ |
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TUint offset; |
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// Get the offset for the string. |
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offset = iStringTable->Length(); |
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// If need be re-alloc the string table. |
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if ((iStringTable->Length() + aValue.Length()) >= iStringTable->Des().MaxLength()) |
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{ |
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TUint delta = KStringTableInc; |
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if (aValue.Length() > KStringTableInc) |
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{ |
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delta = aValue.Length() + KStringTableInc; |
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} |
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iStringTable = iStringTable->ReAllocL(iStringTable->Des().MaxLength() + delta); |
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} |
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// Add the value to the string table. |
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iStringTable->Des().Append(aValue); |
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// Add the attribute token block. |
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InsertTokenL(EPackedTokenAttribute); |
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InsertTokenL(aAttribute); |
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InsertTokenL(offset); |
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InsertTokenL(aValue.Length()); |
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} |
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// ----------------------------------------------------------------------------- |
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// CPacked::AddAttributeL |
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// |
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// Insert an attribute. This attribute is applied to the enclosing entity |
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// (Feed, Item, Enclosure, folder, etc.). |
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// ----------------------------------------------------------------------------- |
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// |
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void CPacked::AddAttributeL(TInt aAttribute, TInt aValue) |
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{ |
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TBuf<25> buff; |
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buff.AppendNum(aValue); |
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AddAttributeL(aAttribute, buff); |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CPacked::InsertTokenL |
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// |
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// Insert a token. |
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// ----------------------------------------------------------------------------- |
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// |
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void CPacked::InsertTokenL(TUint aToken) |
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{ |
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// If need be re-alloc the token array. |
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if (iTokenArrayLength == iTokenArrayMaxLength) |
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{ |
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iTokenArray = static_cast<TUint*>(User::ReAllocL(iTokenArray, sizeof(TUint) * |
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(iTokenArrayMaxLength + KTokenArrayInc))); |
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|
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iTokenArrayMaxLength += KTokenArrayInc; |
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} |
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|
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// Append the token. |
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iTokenArray[iTokenArrayLength++] = aToken; |
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} |
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|
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|
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// ----------------------------------------------------------------------------- |
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// CPacked::AppendTokenChunkL |
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// |
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// Append a chunk of "token" values to the feed. |
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// ----------------------------------------------------------------------------- |
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// |
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void CPacked::AppendTokenChunkL(const TDesC8& aChunk) |
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{ |
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if (aChunk.Length() == 0) |
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{ |
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return; |
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} |
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|
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TInt tokenLength = aChunk.Size() / sizeof(TUint); |
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const TUint* tokens = (const TUint*) aChunk.Ptr(); |
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|
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// If need be re-alloc the token array. |
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if ((iTokenArrayLength + tokenLength) >= iTokenArrayMaxLength) |
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{ |
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TInt inc = tokenLength; |
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|
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if (KTokenArrayInc > tokenLength) |
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{ |
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inc = KTokenArrayInc; |
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} |
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163 |
|
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iTokenArray = static_cast<TUint*>(User::ReAllocL(iTokenArray, sizeof(TUint) * |
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(iTokenArrayMaxLength + inc))); |
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|
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iTokenArrayMaxLength += inc; |
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} |
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|
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// Append the tokens. |
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for (TInt i = 0; i < tokenLength; i++) |
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{ |
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iTokenArray[iTokenArrayLength++] = tokens[i]; |
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} |
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} |
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|
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|
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// ----------------------------------------------------------------------------- |
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// CPacked::AppendStringTableChunkL |
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// |
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// Append a chunk of "string-table" values to the feed. |
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// ----------------------------------------------------------------------------- |
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183 |
// |
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void CPacked::AppendStringTableChunkL(const TDesC8& aChunk) |
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{ |
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if (aChunk.Length() == 0) |
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{ |
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return; |
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189 |
} |
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|
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TPtrC buf((const TUint16 *) aChunk.Ptr(), aChunk.Size() / sizeof(TUint16)); |
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192 |
|
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// If need be re-alloc the string table. |
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if ((iStringTable->Length() + buf.Length()) >= iStringTable->Des().MaxLength()) |
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195 |
{ |
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TInt inc = buf.Length(); |
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|
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if (KStringTableInc > buf.Length()) |
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199 |
{ |
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inc = KStringTableInc; |
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} |
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|
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iStringTable = iStringTable->ReAllocL(iStringTable->Des().MaxLength() + |
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inc); |
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} |
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|
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// Add the value to the string table. |
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iStringTable->Des().Append(buf); |
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} |
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|
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|
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// ----------------------------------------------------------------------------- |
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// CPacked::Trim |
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// |
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// Removes any temp memory used while appending chunks. |
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// ----------------------------------------------------------------------------- |
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// |
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void CPacked::Trim() |
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{ |
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// Trim the string table. |
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if (iStringTable->Length() < iStringTable->Des().MaxLength()) |
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222 |
{ |
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TRAP_IGNORE(iStringTable = iStringTable->ReAllocL(iStringTable->Length())); |
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} |
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// Trim the string table. |
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if (iTokenArrayLength < iTokenArrayMaxLength) |
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{ |
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TRAP_IGNORE(iTokenArray = static_cast<TUint*>(User::ReAllocL(iTokenArray, |
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sizeof(TUint) * iTokenArrayLength))); |
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} |
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} |
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// ----------------------------------------------------------------------------- |
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// CPacked::HasNextToken |
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// |
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// Determine if there is a next token. |
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// ----------------------------------------------------------------------------- |
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// |
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TBool CPacked::HasNextToken() const |
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{ |
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return (iNextToken < iTokenArrayLength); |
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} |
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// ----------------------------------------------------------------------------- |
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// CPacked::NextToken |
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// |
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// Returns the next token. |
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// ----------------------------------------------------------------------------- |
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// |
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TUint CPacked::NextToken() const |
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{ |
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// TODO: Panic if iNextToken >= iTokenArrayLength. |
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return iTokenArray[const_cast<CPacked*>(this)->iNextToken++]; |
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} |
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// ----------------------------------------------------------------------------- |
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// CPacked::NextToken |
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// |
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// Resets back to the first token. |
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// ----------------------------------------------------------------------------- |
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// |
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void CPacked::Reset() const |
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{ |
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const_cast<CPacked*>(this)->iNextToken = 0; |
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} |
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// ----------------------------------------------------------------------------- |
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// CPacked::ExtractAttributeValue |
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// |
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// Upon completion aValue wraps the current attribute value. |
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// This method must only be called when the call to NextToken |
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// returns EPackedTokenAttribute. |
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// ----------------------------------------------------------------------------- |
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// |
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void CPacked::ExtractAttributeValue(TUint& aAttribute, TPtrC& aValue) const |
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{ |
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TUint offset; |
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TUint length; |
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// TODO: Panic if iTokenArray[iNextToken] != EPackedTokenAttribute. |
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aAttribute = NextToken(); |
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offset = NextToken(); |
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length = NextToken(); |
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if(iStringTable->Length() >= (length + offset)) |
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{ |
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aValue.Set(iStringTable->Mid(offset, length)); |
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} |
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else |
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{ |
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aValue.Set(KNullDesC); |
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} |
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} |