javascript string hash

strHash.js

(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        define([], factory);
    } else if (typeof exports === 'object') {
        module.exports = factory();
    } else {
        root['strHash'] = factory();
  }
}(this, function () {
	var strHash = {
		SDBM: function(str){
			var hash = 0,
				i, l;
			for( i = 0, l = str.length; i < l ; i++ ){
				hash = str.charCodeAt(i) + (hash << 6) + (hash << 16) - hash;
			}

			return (hash & 0x7FFFFFFF).toString(16);		
		},
		RS: function(str){
			var b = 378551,
				a = 63689,
				hash  = 0,
				i, l;
			for( i = 0, l = str.length; i < l; i++ ){
				// hash = hash * a + str.charCodeAt(i);
				hash = (hash & 0xFFFF) * (a & 0xFFFF) + 
						(((hash >> 16) * (a & 0xFFFF)) << 16) +
						(((hash & 0xFFFF) * (a  >> 16)) << 16) + str.charCodeAt(i);
				hash &= 0xFFFFFFFF;
				a = (a * b) & 0xFFFFFFFF;
			}

			return (hash & 0x7FFFFFFF).toString(16);
		},
		JS: function(str){
			var hash = 1315423911,
				i, l;
			for( i = 0, l = str.length; i < l; i++ ){
				hash ^= ((hash << 5) + str.charCodeAt(i) + (hash >> 2));
			}

			return (hash & 0x7FFFFFFF).toString(16);
		},
		PJW: function(str){
			var bitsInUnsignedInt = 4 * 8,
				threeQuarters = (bitsInUnsignedInt  * 3) / 4,
				oneEighth = bitsInUnsignedInt / 8,
				highBits = 0xFFFFFFFF << (bitsInUnsignedInt - oneEighth),
				hash = 0,
				test = 0,
				i,l;

			for (i = 0, l = str.length; i < l; i++) {
				hash = (hash << oneEighth) + str.charCodeAt(i);
			}

			if ((test = hash & highBits) !== 0) {
				hash = (hash ^ (test >> threeQuarters)) & ~highBits;
			}

			return (hash & 0x7FFFFFFF).toString(16);
		},
		ELF: function(str){
			var hash = 0,
				x = 0,
				i,l;

			for( i = 0, l = str.length; i < l; i++ ){
				hash = (hash << 4) + str.charCodeAt(i);
		        if ((x = hash & 0xF0000000) !== 0){
		            hash ^= (x >> 24);
		            hash &= ~x;
		        }
			}

			return (hash & 0x7FFFFFFF).toString(16);
		},
		BKDR: function(str){
			var seed = 131,
				hash = 0,
				i,l;

			for( i = 0, l = str.length; i < l; i++ ){
				hash = hash * seed + str.charCodeAt(i);
				hash &= 0x7FFFFFFF;
			}

			return hash.toString(16);
		},
		DJB: function(str){
			var hash = 5381,
				i,l;

			for( i = 0, l = str.length; i < l; i++ ){
				hash += (hash << 5) + str.charCodeAt(i);
			}

			return (hash & 0x7FFFFFFF).toString(16);		
		},
		AP: function(str){
			var hash = 0,
				i,l;
			for( i = 0, l = str.length; i < l; i++ ){
				if( i%1 ){
					hash ^= (~((hash << 11) ^ str.charCodeAt(i) ^ (hash >> 5)));
				} else {
					hash ^= ((hash << 7) ^ str.charCodeAt(i) ^ (hash >> 3));
				}
			}

			return (hash & 0x7FFFFFFF).toString(16);
		}
	};

    return strHash;
}));