'Declaration
 
Public Overloads Overrides Function Compress( _
   ByVal buffer() As Byte, _
   ByVal offset As Integer, _
   ByVal count As Integer, _
   ByVal endOfData As Boolean, _
   ByRef compressed() As Byte _
) As Integer

'Usage
 
Dim instance As ManagedPPMdCompressor
Dim buffer() As Byte
Dim offset As Integer
Dim count As Integer
Dim endOfData As Boolean
Dim compressed() As Byte
Dim value As Integer
 
value = instance.Compress(buffer, offset, count, endOfData, compressed)

public override int Compress( 
   byte[] buffer,
   int offset,
   int count,
   bool endOfData,
   out byte[] compressed
)

Parameters

buffer

An array of bytes to compress. A maximum of count bytes are taken from this array and compressed. Cannot be null.

offset

The byte offset in buffer at which to begin taking the data to compress. Cannot be less than 0.

count

The maximum number of bytes to be taken from buffer. Cannot be less than 0.

endOfData

Indicates if this call ends the stream of data to compress.

compressed

An array of bytes containing the compressed data. Can be empty.

Return Value

During a compression session, the compression engine can choose to keep the data to compress in an internal buffer and return an empty array after a call to Compress. Many compression algorithms do this to get optimum compression by examining a certain number of bytes before compressing anything.

A call to Compress with an empty buffer or a count of zero tells the compression engine to flush its internal buffer and return the compressed data. This may degrade the compression ratio.

When Compress is called with the parameter endOfData set to True, the compression session is closed and all of the remaining compressed data is returned. The next call to Compress will create a new compression session.

The compressed array may have a Length greater than the number of bytes returned by the call to Compress.

.NET: net5.0, net5.0-windows, net6.0, net6.0-macos, net6.0-windows, net7.0, net7.0-macos, net7.0-windows, net8.0, net8.0-browser, net8.0-macos, net8.0-windows, net9.0, net9.0-browser, net9.0-macos, net9.0-windows, net10.0, net10.0-browser, net10.0-macos, net10.0-windows.

.NET Standard: netstandard2.0, netstandard2.1

.NET Framework: net20, net35, net40, net403, net45, net451, net452, net46, net461, net462, net463, net47, net471, net472, net48, net481.

Reference

ManagedPPMdCompressor Class
ManagedPPMdCompressor Members
Overload List
Base Implementation in Compress