GZ/nwyj/.svn/pristine/7b/7b9f0d08009c67405b9edc9dca4926ca26cdc37b.svn-base

if (!dojo._hasResource["dojox.encoding.bits"]) { // _hasResource checks added
													// by build. Do not use
													// _hasResource directly in
													// your code.
	dojo._hasResource["dojox.encoding.bits"] = true;
	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;
				}
			});

}