C# Class ICSharpCode.SharpZipLib.LZW.LzwInputStream

This filter stream is used to decompress a LZW format stream. Specifically, a stream that uses the LZC compression method. This file format is usually associated with the .Z file extension. See http://en.wikipedia.org/wiki/Compress See http://wiki.wxwidgets.org/Development:_Z_File_Format The file header consists of 3 (or optionally 4) bytes. The first two bytes contain the magic marker "0x1f 0x9d", followed by a byte of flags. Based on Java code by Ronald Tschalar, which in turn was based on the unlzw.c code in the gzip package.

Inheritance: Stream

Show file Open project: fanfeilong/exceltk Class Usage Examples

Public Methods

Method	Description
BeginWrite ( byte buffer, int offset, int count, AsyncCallback callback, object state ) : IAsyncResult	Entry point to begin an asynchronous write. Always throws a NotSupportedException.
Flush ( ) : void	Flushes the baseInputStream
LzwInputStream ( Stream baseInputStream ) : System	Creates a LzwInputStream
Read ( byte buffer, int offset, int count ) : int	Reads decompressed data into the provided buffer byte array
ReadByte ( ) : int	See System.IO.Stream.ReadByte
Seek ( long offset, SeekOrigin origin ) : long	Sets the position within the current stream Always throws a NotSupportedException
SetLength ( long value ) : void	Set the length of the current stream Always throws a NotSupportedException
Write ( byte buffer, int offset, int count ) : void	Writes a sequence of bytes to stream and advances the current position This method always throws a NotSupportedException
WriteByte ( byte value ) : void	Writes one byte to the current stream and advances the current position Always throws a NotSupportedException

Protected Methods

Method	Description
Dispose ( bool disposing ) : void

Private Methods

Method	Description
Fill ( ) : void
ParseHeader ( ) : void
ResetBuf ( int bitPosition ) : int	Moves the unread data in the buffer to the beginning and resets the pointers.

Method Details

BeginWrite() public method

Entry point to begin an asynchronous write. Always throws a NotSupportedException.

Any access

public BeginWrite ( byte buffer, int offset, int count, AsyncCallback callback, object state ) : IAsyncResult
buffer	byte	The buffer to write data from
offset	int	Offset of first byte to write
count	int	The maximum number of bytes to write
callback	AsyncCallback	The method to be called when the asynchronous write operation is completed
state	object	A user-provided object that distinguishes this particular asynchronous write request from other requests
return	IAsyncResult

Dispose() protected method

protected Dispose ( bool disposing ) : void
disposing	bool
return	void

Flush() public method

Flushes the baseInputStream

public Flush ( ) : void
return	void

LzwInputStream() public method

Creates a LzwInputStream

public LzwInputStream ( Stream baseInputStream ) : System
baseInputStream	Stream	/// The stream to read compressed data from (baseInputStream LZW format) ///
return	System

Read() public method

Reads decompressed data into the provided buffer byte array

public Read ( byte buffer, int offset, int count ) : int
buffer	byte	/// The array to read and decompress data into ///
offset	int	/// The offset indicating where the data should be placed ///
count	int	/// The number of bytes to decompress ///
return	int

ReadByte() public method

See System.IO.Stream.ReadByte

public ReadByte ( ) : int
return	int

Seek() public method

Sets the position within the current stream Always throws a NotSupportedException

Any access

public Seek ( long offset, SeekOrigin origin ) : long
offset	long	The relative offset to seek to.
origin	SeekOrigin	The defining where to seek from.
return	long

SetLength() public method

Set the length of the current stream Always throws a NotSupportedException

Any access

public SetLength ( long value ) : void
value	long	The new length value for the stream.
return	void

Write() public method

Writes a sequence of bytes to stream and advances the current position This method always throws a NotSupportedException

Any access

public Write ( byte buffer, int offset, int count ) : void
buffer	byte	Thew buffer containing data to write.
offset	int	The offset of the first byte to write.
count	int	The number of bytes to write.
return	void

WriteByte() public method

Writes one byte to the current stream and advances the current position Always throws a NotSupportedException

Any access

public WriteByte ( byte value ) : void
value	byte	The byte to write.
return	void