apple-data-compression - npm Package Compare versions

Comparing version 0.2.0 to 0.3.0

lib/decompress.js

		@@ -1,2 +0,2 @@
		var ADC = require( './adc' )
		const ADC = require( './adc' )

		@@ -6,8 +6,16 @@ // The sliding window buffer needs to be at least
		// The value of 128 was chosen as it's the next power of 2 from 67
		const window = Buffer.allocUnsafeSlow( 65535 + 128, 0 )
		// const window = Buffer.allocUnsafeSlow( 65535 + 128, 0 )
		var windowOffset = 0
		var windowSize = 65535 + 67
		const window = new Uint8Array( windowSize )

		window.fill( 0 )
		function getWindow( position ) {
		return window[ ( position + windowOffset ) % windowSize ]
		}

		function slide( buffer, length ) {
		return buffer.copy( buffer, 0, length, buffer.length )
		function setWindow( position, value ) {
		// NOTE: Guard against overrunning `Number.MAX_SAFE_INTEGER`
		// when decompressing large amounts of data;
		windowOffset = ( windowOffset % windowSize ) === 0 ? 0 : windowOffset
		return window[ ( position + windowOffset ) % windowSize ] = value
		}
		@@ -19,8 +27,15 @@
		var data = Buffer.alloc( length, 0 )
		var offset = windowSize - data.length

		slide( window, data.length )
		// Advance position one byte, past the chunk length we read above
		position += 1

		buffer.copy( data, 0, position + 1 )
		buffer.copy( window, window.length - data.length, position + 1 )
		windowOffset += length

		buffer.copy( data, 0, position )

		for( var i = 0; i < length; i++ ) {
		setWindow( offset + i, buffer[ position++ ] )
		}

		return data
		@@ -35,8 +50,8 @@
		var data = Buffer.alloc( length, 0 )
		var slidePosition = window.length - data.length
		var slidePosition = windowSize - data.length

		slide( window, data.length )
		windowOffset += length

		for( var i = 0; i < length; i++ ) {
		data[i] = window[ slidePosition ] = window[ slidePosition - offset - 1 ]
		data[i] = setWindow( slidePosition, getWindow( slidePosition - offset - 1 ) )
		slidePosition++
		@@ -61,2 +76,4 @@ }

		windowOffset = 0

		while( position < buffer.length ) {
		@@ -85,3 +102,2 @@ chunkType = ADC.getChunkType( buffer[ position ] )

		decompress.slide = slide
		decompress.decode = decodeData
		@@ -88,0 +104,0 @@ decompress.runLength = decodeRunlength

lib/decompressor.js

		@@ -20,5 +20,3 @@ var ADC = require( './adc' )

		this._window = Buffer.allocUnsafeSlow( 65535 + 128, 0 )
		this._window.fill( 0 )

		this._window = new Uint8Array( 65535 + 67 )
		this._chunks = []
		@@ -84,4 +82,3 @@ this._bytes = 0

		this.push( Buffer.concat( chunks ) )
		next()
		next( null, Buffer.concat( chunks ) )

		@@ -88,0 +85,0 @@ },

package.json

		{
		"name": "apple-data-compression",
		"version": "0.2.0",
		"version": "0.3.0",
		"description": "Apple Data Compression (ADC) Scheme",
		@@ -23,3 +23,3 @@ "license": "MIT",
		"devDependencies": {
		"mocha": "^3.5.3",
		"mocha": "^5.0.2",
		"nanobench": "^2.1.0"
		@@ -26,0 +26,0 @@ },

README.md

		@@ -26,4 +26,19 @@ # Apple Data Compression (ADC) Scheme

		### Sync decompression

		```js
		adc.decompress( buffer ) => Buffer
		var result = adc.decompress( buffer )
		```

		### Streaming

		```js
		var transform = new adc.Decompressor()
		// OR var transform = adc.createDecompress()

		fs.createReadStream( filename )
		.pipe( transform )
		.on( 'data', ( chunk ) => {
		// ...
		})
		```

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