TDesBuf Class Reference

class TDesBuf : public TStreamBuf

A stream buffer that uses a descriptor for its implementation.

A stream of this type is used by RDesWriteStream and RDesReadStream objects. It also has intermediate buffering capabilities.

This is a seekable stream buffer.

When used in write mode, the length of the descriptor is only updated when the stream buffer's SynchL() function is called, i.e. as a result of a call to RWriteStream::CommitL().

RDesWriteStream

RDesReadStream

RWriteStream::CommitL()

MStreamBuf::SynchL()

Inherits from

Public Member Functions
TDesBuf()
IMPORT_C voidSet(TDes8 &, TInt)
Protected Member Functions
IMPORT_C TStreamPosDoSeekL(TMark, TStreamLocation, TInt)
IMPORT_C voidDoSynchL()
IMPORT_C voidOverflowL()
IMPORT_C TIntUnderflowL(TInt)
Private Member Functions
TUint8 *Base()
voidConsolidate()
TDes8 &Des()
Inherited Functions
MStreamBuf::Close()
MStreamBuf::MStreamBuf()
MStreamBuf::PushL()
MStreamBuf::Read(TDes8 &,TInt,TRequestStatus &)
MStreamBuf::Read(TDes8 &,TRequestStatus &)
MStreamBuf::ReadL(MStreamInput &)
MStreamBuf::ReadL(MStreamInput &,TInt)
MStreamBuf::ReadL(MStreamInput &,TStreamTransfer)
MStreamBuf::ReadL(TAny *,TInt)
MStreamBuf::ReadL(TDes8 &,TInt,TRequestStatus &)
MStreamBuf::ReadL(TDes8 &,TRequestStatus &)
MStreamBuf::Release()
MStreamBuf::SeekL(TMark,TStreamLocation,TInt)
MStreamBuf::SeekL(TMark,TStreamPos)
MStreamBuf::SeekL(TRead,TInt)
MStreamBuf::SeekL(TRead,TStreamLocation,TInt)
MStreamBuf::SeekL(TWrite,TInt)
MStreamBuf::SeekL(TWrite,TStreamLocation,TInt)
MStreamBuf::SizeL()const
MStreamBuf::Synch()
MStreamBuf::SynchL()
MStreamBuf::TellL(TRead)const
MStreamBuf::TellL(TWrite)const
MStreamBuf::Write(const TDesC8 &,TInt,TRequestStatus &)
MStreamBuf::Write(const TDesC8 &,TRequestStatus &)
MStreamBuf::WriteL(MStreamOutput &)
MStreamBuf::WriteL(MStreamOutput &,TInt)
MStreamBuf::WriteL(MStreamOutput &,TStreamTransfer)
MStreamBuf::WriteL(const TAny *,TInt)
MStreamBuf::WriteL(const TDesC8 &,TInt,TRequestStatus &)
MStreamBuf::WriteL(const TDesC8 &,TRequestStatus &)
TStreamBuf::Avail(TArea)const
TStreamBuf::Avail(TRead)const
TStreamBuf::Avail(TWrite)const
TStreamBuf::DoReadL(MStreamInput &,TStreamTransfer)
TStreamBuf::DoReadL(TAny *,TInt)
TStreamBuf::DoWriteL(MStreamOutput &,TStreamTransfer)
TStreamBuf::DoWriteL(const TAny *,TInt)
TStreamBuf::End(TArea)const
TStreamBuf::End(TRead)const
TStreamBuf::End(TWrite)const
TStreamBuf::Ptr(TArea)const
TStreamBuf::Ptr(TRead)const
TStreamBuf::Ptr(TWrite)const
TStreamBuf::SetBuf(TArea,TUint8 *,TUint8 *)
TStreamBuf::SetBuf(TRead,TUint8 *,TUint8 *)
TStreamBuf::SetBuf(TWrite,TUint8 *,TUint8 *)
TStreamBuf::SetEnd(TArea,TUint8 *)
TStreamBuf::SetEnd(TRead,TUint8 *)
TStreamBuf::SetEnd(TWrite,TUint8 *)
TStreamBuf::SetPtr(TArea,TUint8 *)
TStreamBuf::SetPtr(TRead,TUint8 *)
TStreamBuf::SetPtr(TWrite,TUint8 *)
TStreamBuf::TStreamBuf()
Inherited Enumerations
MStreamBuf:TRead
MStreamBuf:TWrite
Private Attributes
TDes8 *iDes

Constructor & Destructor Documentation

TDesBuf()

IMPORT_CTDesBuf()

Member Functions Documentation

Base()

TUint8 *Base()const [private, inline]

Consolidate()

voidConsolidate()[private]

Des()

TDes8 &Des()const [private, inline]

DoSeekL(TMark, TStreamLocation, TInt)

IMPORT_C TStreamPosDoSeekL(TMarkaMark,
TStreamLocationaLocation,
TIntanOffset
)[protected, virtual]

Parameters

TMark aMark
TStreamLocation aLocation
TInt anOffset

DoSynchL()

IMPORT_C voidDoSynchL()[protected, virtual]

OverflowL()

IMPORT_C voidOverflowL()[protected, virtual]

Empties the intermediate buffer and resets the start and end points of the write area.

The implementation of this function depends on the way the stream itself is implemented. For example, the in-memory streams have simple implementations.

Set(TDes8 &, TInt)

IMPORT_C voidSet(TDes8 &aDes,
TIntaMode = ERead|EWrite
)

Parameters

TDes8 & aDes
TInt aMode = ERead|EWrite

UnderflowL(TInt)

IMPORT_C TIntUnderflowL(TIntaMaxLength)[protected, virtual]

Re-fills the intermediate buffer and resets the start and end points of the read area.

The implementation of this function depends on the way the stream itself is implemented. For example, the in-memory streams have simple implementations.

The amount of data available in the intermediate buffer.

Parameters

TInt aMaxLengthThe maximum amount of data required for the intermediate buffer.

Member Data Documentation

TDes8 * iDes

TDes8 *iDes[private]