author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 01:11:40 +0200 | |
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// Copyright (c) 2006-2009 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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@file |
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@publishedPartner |
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@released |
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*/ |
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#ifndef MMTPTYPE_H |
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#define MMTPTYPE_H |
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|
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#include <e32std.h> |
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|
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/** |
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Defines the generic MTP data type interface. All non-opaque MTP data comprises |
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either a single atomic value of a simple type, or a set of atomic simple type |
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values organised according to some dataset structure. Structured datasets may |
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take one of the following general forms: |
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|
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1. Flat - a contiguous collection of values. |
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2. Complex - a contiguous array or string of values. |
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3. Compound - a mixed sequence of simple, flat, and complex types. |
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|
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Any time data is passed as a parameter to an MTP operation, response or event; |
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or any time data is passed in the data phase of a fully described operation, |
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that data must be of a type that implements the generic MTP data type |
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interface. |
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@publishedPartner |
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@released |
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*/ |
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class MMTPType |
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{ |
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|
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public: |
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|
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/** |
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Initiates a data read sequence on the type by providing a const pointer |
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to the first in the sequence of data chunks that make up the type's data |
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stream. Subsequent chunks in the sequence can be sequentially retrieved |
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using NextReadChunk. |
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@param aChunk The const pointer to be set to point to the start of the |
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first data chunk. This pointer's length is set to zero if no data chunk |
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exists or a processing error occurs. |
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@return KErrNone, if successful and the read sequence IS NOT complete, i.e. |
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there are one or more additional data chunks available in the read |
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sequence. |
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@return KMTPChunkSequenceCompletion, if successful and the read sequence |
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IS complete, i.e. there are no more additional data chunks available in |
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the read sequence. |
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@return KErrNotFound, if no data chunk is found. |
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@return One of the system wide error codes, if a general processing |
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error occurs. |
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@see NextReadChunk. |
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*/ |
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virtual TInt FirstReadChunk(TPtrC8& aChunk) const = 0; |
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|
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/** |
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Continues a data read sequence on the type by providing a const pointer |
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to the next in the sequence of data chunks that make up the type's data |
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stream. This data read sequence should have been previously initiated by |
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invoking FirstReadChunk. |
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@param aChunk The const pointer to be set to point to the start of the |
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next data chunk. This pointer's length is set to zero if no data chunk |
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exists or a processing error occurs. |
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@return KErrNone, if successful and the read sequence IS NOT complete, i.e. |
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there are one or more additional data chunks available in the read |
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sequence. |
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@return KMTPChunkSequenceCompletion, if successful and the read sequence |
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IS complete, i.e. there are no more additional data chunks available in the |
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read sequence. |
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@return KErrNotReady, if there is no data read sequence in progress, i.e. |
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a read sequence was not previously initiated by invoking FirstReadChunk. |
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@return One of the system wide error codes, if a general processing |
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error occurs. |
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@see FirstReadChunk. |
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*/ |
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virtual TInt NextReadChunk(TPtrC8& aChunk) const = 0; |
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|
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/** |
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Initiates a data write sequence on the type by providing a non-const |
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pointer to the first in the sequence of data chunks that make up the type's |
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data stream. Subsequent chunks in the sequence can be sequentially |
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retrieved using NextWriteChunk. |
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@param aChunk The non-const pointer to be set to point to the start of the |
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first data chunk. If successful, the pointer's Length is set to zero, and |
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MaxLength is set to the available capacity of the data chunk. If not |
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successful, the pointer's MaxLength is set to zero. |
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@return KErrNone, if successful and the write sequence IS NOT complete, |
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i.e. there are one or more additional data chunks available in the write |
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sequence. |
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@return KMTPChunkSequenceCompletion, if successful and the write sequence |
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IS complete, i.e. there are no more additional data chunks available in the |
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write sequence. |
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@return KErrNotFound, if no data chunk is found. |
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@return One of the system wide error codes, if a general processing |
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error occurs. |
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@see NextWriteChunk. |
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111 |
*/ |
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virtual TInt FirstWriteChunk(TPtr8& aChunk) = 0; |
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113 |
|
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114 |
/** |
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115 |
Continues a data write sequence on the type by providing a non-const |
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pointer to the next in the sequence of data chunks that make up the type's |
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117 |
data stream. This data write sequence should have been previously initiated |
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by invoking FirstWriteChunk. |
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@param aChunk The non-const pointer to be set to point to the start of the |
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next data chunk. If successful, the pointer's Length is set to zero, and |
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MaxLength is set to the available capacity of the data chunk. If not |
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successful, the pointer's MaxLength is set to zero.. |
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@return KErrNone, if successful and the write sequence IS NOT complete, i.e. |
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there are one or more additional data chunks available in the write |
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sequence. |
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@return KMTPChunkSequenceCompletion, if successful and the write sequence |
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IS complete, i.e. there are no more additional data chunks available in the |
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write sequence. |
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@return KErrNotReady, if there is no data write sequence in progress, i.e. |
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a write sequence was not previously initiated by invoking FirstWriteChunk. |
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@return One of the system wide error codes, if a general processing |
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error occurs. |
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@see FirstReadChunk. |
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134 |
*/ |
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virtual TInt NextWriteChunk(TPtr8& aChunk) = 0; |
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136 |
|
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137 |
/** |
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Provides the size in bytes of the MTP data type. |
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@return The types size in bytes. |
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*/ |
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virtual TUint64 Size() const = 0; |
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142 |
|
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143 |
/** |
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144 |
Provides the MTP data type identification datacode. |
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@return The MTP data type identification datacode. |
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146 |
*/ |
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virtual TUint Type() const = 0; |
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148 |
|
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149 |
/** |
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150 |
Commits the specified write data chunk. This method should only be invoked |
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151 |
if the type indicates that committing data is required |
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152 |
(@see CommitRequired). Generally this would only be required by types which |
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153 |
are performing intermediate buffering, e.g. a file data object. |
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@param aChunk The data chunk to be commited. |
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@leave KErrNotSupported, if the type does not support data commit. |
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@leave KMTPDataTypeInvalid, if the data type is structurally invalid. |
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@leave One of the system wide error codes, if a general processing error |
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occurs. |
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@see CommitRequired |
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160 |
*/ |
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IMPORT_C virtual MMTPType* CommitChunkL(TPtr8& aChunk); |
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162 |
|
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163 |
/** |
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Indicates if the data type requires that data be committed during data |
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165 |
write sequences. Generally this would only be required by types which |
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166 |
perform intermediate buffering (e.g. a file data object), or by data |
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167 |
types whose final structure is determined by the value of meta data |
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elements within the data stream itself (e.g an MTP ObjectPropDesc dataset). |
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@return ETrue if CommitChunkL should be called after each invocation of |
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ChunkWritePtr, otherwise EFalse. |
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@see CommitChunkL |
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@see ChunkWritePtr |
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173 |
*/ |
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IMPORT_C virtual TBool CommitRequired() const; |
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175 |
|
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176 |
/** |
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177 |
Validates the structural integrity of the data type. This method can be |
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invoked on completion of a data write sequence to validate that the |
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received data represents a structurally valid instance of the data type. |
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@return KErrNone if the data type is structurally valid, otherwise |
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KMTPDataTypeInvalid. |
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*/ |
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IMPORT_C virtual TInt Validate() const; |
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184 |
|
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185 |
/** |
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186 |
Copies the data from one MTP data type object to another. This is |
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187 |
accomplished by attaching read and write data streams from the source |
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188 |
object to the sink object. The source and sink objects are not |
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189 |
required to be of the same type and no type compatibility checking is |
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190 |
performed. |
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@param aFrom The MTP source data type object. |
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@param aTo The MTP source data type object. |
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@leave One of the system wide error codes, if a general processing error |
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occurs. |
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195 |
*/ |
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IMPORT_C static void CopyL(const MMTPType& aFrom, MMTPType& aTo); |
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197 |
|
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198 |
/** |
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199 |
Provides an MTP data type extension interface implementation |
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200 |
for the specified interface Uid. |
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@param aInterfaceUid The unique identifier for the extension interface being |
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requested. |
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@return Pointer to an interface instance or 0 if the interface is not |
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supported. Ownership is NOT transfered. |
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*/ |
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IMPORT_C virtual TAny* GetExtendedInterface(TUid aInterfaceUid); |
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IMPORT_C virtual TInt FirstWriteChunk(TPtr8& aChunk, TUint aDataLength); |
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IMPORT_C virtual TInt NextWriteChunk(TPtr8& aChunk, TUint aDataLength); |
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IMPORT_C virtual TBool ReserveTransportHeader(TUint aHeaderLength, TPtr8& aHeader); |
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}; |
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/** |
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MTP completion code +17 : Indicates that a data type read or write data |
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sequence has successfully completed. This code does not indicate an error |
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condition. |
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@see FirstReadChunk. |
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@see NextReadChunk. |
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@see FirstWriteChunk. |
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@see NextWriteChunk. |
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*/ |
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const TInt KMTPChunkSequenceCompletion = (+17); |
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/** |
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MTP completion code -20 : Indicates that a data type is structurally invalid. |
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@see CommitChunkL |
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@see Validate. |
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*/ |
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const TInt KMTPDataTypeInvalid = (-20); |
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#endif // MMTPTYPE_H |
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