Class TUnicodeCompressor

class TUnicodeCompressor : public TUnicodeCompressionState;

Description

A class to hold functions to compress text using the Standard Compression Scheme for Unicode.

A note on error handling and leaving.

Although all the public functions except the constructor can leave, it is possible to guarantee success: that is, guarantee that a call will not leave, and that compression will be completed. To do this, (i) supply a MUnicodeSource object with a non-leaving ReadUnicodeValueL function, such as a TMemoryUnicodeSource; (ii) write output to a RWriteStream with a non-leaving WriteL function, or to a buffer that you already know to be big enough, which can be found out using CompressedSizeL.

This guarantee of success is particularly useful when compressing from one memory buffer to another.

Derivation

• TUnicodeCompressionState - (No abstract)

• TUnicodeCompressor - ...

Members

Defined in TUnicodeCompressor:

• CompressL(RWriteStream &,MUnicodeSource &,TInt,TInt,TInt *,TInt *)
• CompressL(TUint8 *,MUnicodeSource &,TInt,TInt,TInt *,TInt *)
• CompressedSizeL(MUnicodeSource &,TInt)
• FlushL(RWriteStream &,TInt,TInt &)
• FlushL(TUint8 *,TInt,TInt &)
• TUnicodeCompressor()

Inherited from TUnicodeCompressionState:

• EDynamicWindows
• ENotUnicode
• EOutputBufferOverflow
• ESpecialBases
• EStaticWindows
• EUnhandledByte
• TPanic
• anonymous
• iActiveWindowBase
• iCompressedBytes
• iDynamicWindow
• iDynamicWindowDefault
• iMaxCompressedBytes
• iMaxUnicodeWords
• iSpecialBase
• iStaticWindow
• iUnicodeMode
• iUnicodeWords

IMPORT_C TUnicodeCompressor();

Description

IMPORT_C void CompressL(RWriteStream &aOutput, MUnicodeSource &aInput, TInt aMaxOutputBytes=KMaxTInt, TInt aMaxInputWords=KMaxTInt, TInt *aOutputBytes=0,TInt *aInputWords=0);

Description

Parameters

RWriteStream &aOutput MUnicodeSource &aInput TInt aMaxOutputBytes TInt aMaxInputWords TInt *aOutputBytes TInt *aInputWords

IMPORT_C void CompressL(TUint8 *aOutput, MUnicodeSource &aInput, TInt aMaxOutputBytes=KMaxTInt, TInt aMaxInputWords=KMaxTInt, TInt *aOutputBytes=0,TInt *aInputWords=0);

Description

Parameters

TUint8 *aOutput MUnicodeSource &aInput TInt aMaxOutputBytes TInt aMaxInputWords TInt *aOutputBytes TInt *aInputWords

IMPORT_C TInt FlushL(RWriteStream &aOutput, TInt aMaxOutputBytes, TInt &aOutputBytes);

Description

Parameters

RWriteStream &aOutput TInt aMaxOutputBytes TInt &aOutputBytes

Return value

TInt

IMPORT_C TInt FlushL(TUint8 *aOutput, TInt aMaxOutputBytes, TInt &aOutputBytes);

Description

Parameters

TUint8 *aOutput TInt aMaxOutputBytes TInt &aOutputBytes

Return value

TInt

IMPORT_C static TInt CompressedSizeL(MUnicodeSource &aInput, TInt aInputWords);

Description

Parameters

MUnicodeSource &aInput TInt aInputWords

Return value

TInt