Updated Feb 27, 2008 by soubok
Labels:	doc

jsz

jsz module

home > JSLibs > jsz - -

Description

This module manage zlib data compression and decompression. more.

Example

var deflate = new Z( Z.DEFLATE, 9 );
var clearData;
var compressedData;

for ( var i = 10; i >= 0; --i ) {

	var chunk = randomString(10000);
	compressedData += deflate( chunk );
	clearData += chunk;
}
compressedData += deflate(); // flush


var inflate = new Z( Z.INFLATE );
var clearData2 = inflate( compressedData, true );

Print( 'ratio:' + compressedData.length + ': ' + Math.round( 100 * compressedData.length / clearData.length ) + '%','\n');
if ( clearData2 != clearData )

	Print('error!!!','\n');
}

code snippet

jsz::Z class

home > JSLibs > jsz > Z -

Description

Functions

_constructor Z( method [, compressionLevel ] )

Constructs a new inflater or deflater object.
The method can be Z.DEFLATE to compress data or Z.INFLATE to decompress data. The compression level is like this: 0 <= compressionLevel <= 9.
note:

For Z.INFLATE method, compressionLevel argument is useless ( no sense )
example:

var compress = new Z( Z.DEFLATE, 9 );

outputData call operator( [ inputData [, forceFinish = false ] ] )

This function process inputData as a stream. If forceFinish is true, the inputData and any buffered data are flushed to the outputData. If this function is call without any argument, All remaining data are flushed. If eof has already reach, the function returns an empty outputData string.
example:

var compress = new Z( Z.DEFLATE ); var compressedData = compress( 'Hello '); compressedData += compress( 'world' ); compressedData += compress(); // flush
example:

var compress = new Z( Z.DEFLATE ); var compressedData = compress( 'Hello '); compressedData += compress( 'world', true ); // flush
example:

var compressedData = new Z( Z.DEFLATE )( 'Hello world', true ); // flush