'Declaration
 
Public Overloads Shared Function Compress( _

   ByVal buffer() As Byte, _

   ByVal offset As Integer, _

   ByVal count As Integer, _

   ByVal method As CompressionMethod, _

   ByVal level As CompressionLevel _

) As Byte()

'Usage
 
Dim buffer() As Byte

Dim offset As Integer

Dim count As Integer

Dim method As CompressionMethod

Dim level As CompressionLevel

Dim value() As Byte

 

value = XceedCompressedStream.Compress(buffer, offset, count, method, level)

public static byte[] Compress( 

   byte[] buffer,

   int offset,

   int count,

   CompressionMethod method,

   CompressionLevel level

)

Parameters

buffer

The array of bytes to compress. A maximum of count bytes are taken from this array and compressed

offset

The byte offset in buffer at which to begin taking the data to compress.

count

The maximum number of bytes to be taken from buffer.

method

A Xceed.Compression.CompressionMethod value representing the compression method to use.

level

A Xceed.Compression.CompressionLevel value representing the compression level to use.

Return Value

If the data to compress is not a byte array, it will need to be converted into a byte array before it can be compressed. This can be done, in the case of a string, using the System.Text.Encoding.GetBytes(System.Char[]) method of the System.Text.Encoding class.

The Stored compression method is not supported. The compression level only applies to the Deflated and Deflated64 compression methods.  It does not apply to the BZip2, BWT, or PPMd compression methods.

The PPMd algorithm uses a custom memory management system called SubAllocator. In a zip file, the memory size the SubAllocator uses is defined in the WinZip PPMd header for the compressed file and this header's value is used when decompressing the data. In general, WinZip uses 64Mb. Since the algorithm used was not optimized from the original PPMd version I revision 1, the SubAllocator initially requires the total amount of memory specified in the PPMd compressor. This means you must have at least 64 free Mb of RAM when using this compression method.

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

XceedCompressedStream Class
XceedCompressedStream Members
Overload List