BZip2.BZ2Stream

BZip2.BZ2Stream

Class Declaration

 Protected Class BZ2Stream
 Implements Readable,Writeable

Remarks

This represents a data stream that was/will be compressed using BZip2.

A BZ2Stream has a reference to a Writeable object to which all compressed output is ultimately written; this is the "output stream". A corresponding Readable object is the ultimate source for all compressed input; this is the "input stream".

Typically, when compressing you only specify the output stream and when decompressing only the input stream. However both may be used simultaneously. This can be useful if you need to read and write both compressed and uncompressed bytes from a single stream (e.g. a zip stream), or to create one end of a (de)compressed "pipe" by using two distinct streams.

This class implements the Readable and Writeable class interfaces.

Methods

• Close
• Constructor
• EOF
• Flush
• IsReadable
• IsWriteable
• LastError
• Lookahead
• Read
• ReadLine
• ReadError
• Write
• WriteLine
• WriteError

Properties

• BufferedReading As Boolean
• Level As Integer
• TotalIn As UInt64
• TotalOut As UInt64

Shared Methods

• Create
• Open

Example

This example creates an in-memory compression stream by calling Constructor(MemoryBlock), and writes some data to be compressed:

  Dim output As New MemoryBlock(0)
  Dim compressor As New BZip2.BZ2Stream(output)
  compressor.Write("Hello, world!")
  compressor.Close