lowlevellibsandfws/apputils/inc/BARSREAD.H
author Simon Howkins <simonh@symbian.org>
Thu, 28 Oct 2010 12:05:33 +0100
branchRCL_3
changeset 78 5b3c983434ca
parent 0 e4d67989cc36
permissions -rw-r--r--
Commented out export of missing CRML source file to avoid build error. There are no known side effects of this file being missing, so this seems a reasonable way to avoid the build error.
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// Copyright (c) 1997-2009 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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#ifndef __BARSREAD_H__
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#define __BARSREAD_H__
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#include <e32std.h>
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#include <badesca.h>
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class TResourceReaderImpl;
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/** 
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Interprets resource data read from a resource file.
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To use an instance of this class, pass the buffer containing the resource 
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data to it by calling SetBuffer().
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The buffer containing the resource data is created by RResourceFile::AllocReadLC() or 
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RResourceFile::AllocReadL() which reads the specified resource into it.
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The current position within the buffer is always maintained and any request 
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for data is always supplied from the current position. The current position 
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is always updated .
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@see TResourceReader::SetBuffer()
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@see RResourceFile::AllocReadL()
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@see RResourceFile::AllocReadLC() 
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@publishedAll
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@released
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*/
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class TResourceReader
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    {
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public:
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    IMPORT_C void SetBuffer(const TDesC8* aBuffer);
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    IMPORT_C const TAny* Ptr();
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    // Read counted strings into allocated buffer
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    inline HBufC*   ReadHBufCL();
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    IMPORT_C HBufC8*  ReadHBufC8L();
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    IMPORT_C HBufC16* ReadHBufC16L();
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    // Build pointer from a counted string
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    inline TPtrC   ReadTPtrC();
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    IMPORT_C TPtrC8  ReadTPtrC8();
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	IMPORT_C TPtrC16 ReadTPtrC16();
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    // Build pointer from a counted string in an array of counted strings,
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    // also setting the buffer to be used.
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    inline TPtrC ReadTPtrC(TInt aIndex,const TDesC8* aBuffer);
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    IMPORT_C TPtrC8 ReadTPtrC8(TInt aIndex,const TDesC8* aBuffer);
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    IMPORT_C TPtrC16 ReadTPtrC16(TInt aIndex,const TDesC8* aBuffer);
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    // Build an array of strings from a resource array
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    inline CDesCArrayFlat*   ReadDesCArrayL();
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    IMPORT_C CDesC8ArrayFlat*  ReadDesC8ArrayL();
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    IMPORT_C CDesC16ArrayFlat* ReadDesC16ArrayL();
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    IMPORT_C TInt ReadInt8();
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    IMPORT_C TUint ReadUint8();
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    IMPORT_C TInt ReadInt16();
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    IMPORT_C TUint ReadUint16();
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    IMPORT_C TInt ReadInt32();
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    IMPORT_C TUint ReadUint32();
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    IMPORT_C TReal64 ReadReal64() __SOFTFP;
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    IMPORT_C void Read(TAny* aPtr,TInt aLength);
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    IMPORT_C void Rewind(TInt aLength);
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    IMPORT_C void Advance(TInt aLength);
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private:
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	void CreateImpl();
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	TResourceReaderImpl* Impl();
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	const TResourceReaderImpl* Impl() const;
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	TPtrC8 ReadTPtrC8L();
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	TPtrC16 ReadTPtrC16L();
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	TPtrC8 ReadTPtrC8L(TInt aIndex,const TDesC8* aBuffer);
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	TPtrC16 ReadTPtrC16L(TInt aIndex,const TDesC8* aBuffer);
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	TInt ReadInt8L();
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	TUint ReadUint8L();
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	TInt ReadInt16L();
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	TUint ReadUint16L();
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	TInt ReadInt32L();
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	TUint ReadUint32L();
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	TReal64 ReadReal64L() __SOFTFP;
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private:
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	enum
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		{
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		KRsReaderSize = 12
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		};
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	TUint8 iImpl[KRsReaderSize];
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    };
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#if defined(_UNICODE)
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/** 
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Interprets the data at the current buffer position as leading byte count data 
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and constructs a build independent heap descriptor containing a copy of this 
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data.
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   113
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The data is interpreted as:
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   115
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a byte value defining the number of text characters or the length of binary 
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   117
data
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parents:
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   118
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followed by:
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   120
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the text characters or binary data. This resource data is interpreted as either 
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8-bit or 16-bit, depending on the build.
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parents:
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   123
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If the value of the leading byte is zero, the function assumes that no data 
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follows the leading byte and returns a NULL pointer.
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   126
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The current position within the resource buffer is updated. If the resulting 
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position lies beyond the end of the resource buffer, then the function raises 
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a BAFL 4 panic.
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   130
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Use this build independent variant when the resource contains text. If the 
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resource contains binary data, use the explicit 8-bit variant ReadHBufC8L().
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   133
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@return A pointer to the heap descriptor containing a copy of the data following 
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the leading byte count at the current position within the resource buffer. 
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The pointer can be NULL. 
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*/
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inline HBufC* TResourceReader::ReadHBufCL()
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    {
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	return ReadHBufC16L();
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	}
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   142
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   143
/** 
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Interprets the data at the current buffer position as leading byte count data 
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and constructs a non modifiable pointer descriptor to represent this data.
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   146
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The data is interpreted as:
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   148
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a byte value defining the number of text characters or the length of binary 
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data
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parents:
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   151
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followed by:
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parents:
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   153
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the text characters or binary data. This resource data is interpreted as either 
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   155
8-bit or 16-bit, depending on the build.
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parents:
diff changeset
   156
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If the value of the leading byte is zero, calling Length() on the returned 
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TPtrC returns zero.
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   159
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The current position within the resource buffer is updated. If the resulting 
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   161
position lies beyond the end of the resource buffer, then the function raises 
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   162
a BAFL 4 panic.
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parents:
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   163
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Use this build independent variant when the resource contains text. If the 
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resource contains binary data, use the explicit 8-bit variant ReadTPtrC8().
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parents:
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   166
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@return A non modifiable pointer descriptor representing the data following 
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the leading byte count at the current position within the resource buffer. 
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*/
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inline TPtrC TResourceReader::ReadTPtrC()
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    {
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	return ReadTPtrC16();
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   173
	}
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   174
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   175
/** 
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   176
Interprets the data within the specified resource buffer as an array of leading 
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   177
byte count data and constructs a non modifiable pointer descriptor to represent 
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   178
an element within this array.
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   179
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   180
The function sets the buffer containing the resource data and sets the current 
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   181
position to the start of this buffer. Any buffer set by a previous call to 
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   182
SetBuffer() etc, is lost.
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parents:
diff changeset
   183
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   184
The buffer is expected to contain an array of data elements preceded by a 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   185
TInt16 value defining the number of elements within that array.
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parents:
diff changeset
   186
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   187
Each element of the array is interpreted as:
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parents:
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   188
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   189
a byte value defining the number of text characters or the length of binary 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   190
data
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parents:
diff changeset
   191
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   192
followed by:
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parents:
diff changeset
   193
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   194
the text characters or binary data. This resource data is interpreted as either 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   195
8-bit or 16-bit, depending on the build.
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parents:
diff changeset
   196
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parents:
diff changeset
   197
If the value of the leading byte is zero, calling Length() on the returned 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   198
TPtrC returns zero.
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parents:
diff changeset
   199
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   200
The current position within the resource buffer is updated. If the resulting 
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   201
position lies beyond the end of the resource buffer, then the function raises 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   202
a BAFL 4 panic.
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parents:
diff changeset
   203
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parents:
diff changeset
   204
Use this build independent variant when the elements contain text. If the 
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   205
elements contain binary data, use the explicit 8-bit variant ReadTPtrC8(TInt,const TDesC8*).
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parents:
diff changeset
   206
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   207
@param aIndex The position of the element within the array. This value is 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   208
relative to zero.
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   209
@param aBuffer The buffer containing the resource data.
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   210
@return A non modifiable pointer descriptor representing the data following 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   211
the leading byte count of the element at the specified position within the 
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   212
array. 
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parents:
diff changeset
   213
*/
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   214
inline TPtrC TResourceReader::ReadTPtrC(TInt aIndex,const TDesC8* aBuffer)
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   215
    {
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parents:
diff changeset
   216
	return ReadTPtrC16(aIndex, aBuffer);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   217
	}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   218
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   219
/** 
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parents:
diff changeset
   220
Interprets the data at the current buffer position as an array of leading byte 
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   221
count data and constructs a build independent flat array of descriptors.
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   222
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   223
Each descriptor in the descriptor array corresponds to an element of the resource 
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   224
array.
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parents:
diff changeset
   225
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   226
At the current buffer position, the buffer is expected to contain an array 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   227
of data elements preceded by a TInt16 value defining the number of elements 
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parents:
diff changeset
   228
within that array.
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parents:
diff changeset
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Each element of the array is interpreted as:
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a byte value defining the number of text characters or the length of binary 
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data
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followed by:
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the text characters or binary data. This resource data is interpreted as either 
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8-bit or 16-bit, depending on the build.
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The current position within the resource buffer is updated. If the resulting 
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position lies beyond the end of the resource buffer, then the function raises 
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a BAFL 4 panic.
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Use this build independent variant when the elements contain text. If the 
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elements contain binary data, use the explicit 8-bit variant ReadDesC8ArrayL().
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@return A pointer to a build independent flat descriptor array. 
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*/
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inline CDesCArrayFlat* TResourceReader::ReadDesCArrayL()
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    {
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	return ReadDesC16ArrayL();
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	}
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#else // defined(_UNICODE)
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inline HBufC* TResourceReader::ReadHBufCL()
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    {
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	return ReadHBufC8L();
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	}
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inline TPtrC TResourceReader::ReadTPtrC()
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    {
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	return ReadTPtrC8();
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	}
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inline TPtrC TResourceReader::ReadTPtrC(TInt aIndex,const TDesC8* aBuffer)
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    {
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	return ReadTPtrC8(aIndex, aBuffer);
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	}
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inline CDesCArrayFlat* TResourceReader::ReadDesCArrayL()
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    {
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	return ReadDesC8ArrayL();
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	}
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#endif// defined(_UNICODE)
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#endif//__BARSREAD_H__