Location: A review of cardiac cellular electrophysiology models @ f6a8f9030738 / dojo-presentation / js / dojo / dojox / encoding / bits.js

Author:

David Nickerson <nickerso@users.sourceforge.net>

Date:

2009-07-16 02:00:03+12:00

Desc:

the starting point for the HH tutorial example

Permanent Source URI:

https://models.fieldml.org/workspace/a1/rawfile/f6a8f90307388eb4b040ee3566b84d88b59247f7/dojo-presentation/js/dojo/dojox/encoding/bits.js

dojo.provide("dojox.encoding.bits");

dojox.encoding.bits.OutputStream = function(){
	this.reset();
};

dojo.extend(dojox.encoding.bits.OutputStream, {
	reset: function(){
		this.buffer = [];
		this.accumulator = 0;
		this.available = 8;
	},
	putBits: function(value, width){
		while(width){
			var w = Math.min(width, this.available);
			var v = (w <= width ? value >>> (width - w) : value) << (this.available - w);
			this.accumulator |= v & (255 >>> (8 - this.available));
			this.available -= w;
			if(!this.available){
				this.buffer.push(this.accumulator);
				this.accumulator = 0;
				this.available = 8;
			}
			width -= w;
		}
	},
	getWidth: function(){
		return this.buffer.length * 8 + (8 - this.available);
	},
	getBuffer: function(){
		var b = this.buffer;
		if(this.available < 8){ b.push(this.accumulator & (255 << this.available)); }
		this.reset();
		return b;
	}
});

dojox.encoding.bits.InputStream = function(buffer, width){
	this.buffer = buffer;
	this.width = width;
	this.bbyte = this.bit = 0;
};

dojo.extend(dojox.encoding.bits.InputStream, {
	getBits: function(width){
		var r = 0;
		while(width){
			var w = Math.min(width, 8 - this.bit);
			var v = this.buffer[this.bbyte] >>> (8 - this.bit - w);
			r <<= w;
			r |= v & ~(~0 << w);
			this.bit += w;
			if(this.bit == 8){
				++this.bbyte;
				this.bit = 0;
			}
			width -= w;
		}
		return r;
	},
	getWidth: function(){
		return this.width - this.bbyte * 8 - this.bit;
	}
});