utzli.js

function Data(a, b, c) {
	this.a = a;
	this.b = b;
	this.c = c;
}
/* Statics */
Data.getBufferDesc = function Data_getBufferDesc() {
	// avoid new instance here, but i'm lazy.
	return [
		{ type: 'UInt32BE', size: 32 },
		{ type: 'UInt32BE', size: 32 },
		{ type: 'FloatBE', size: 32 } // 32 bit float
	];
};

function char2Data(buff) {
	var results = [],
		result,
		values = [],
		bufferDesc = Data.getBufferDesc(),
		fullDataSize =  bufferDesc.reduce(function(prev, next) { prev + (next.size / 8); }),
		value,
		currentDesc,
		j = 0,
		i = 0;


	if ((buff.length % fullDataSize) === 0 ) {
		throw new Error("Your buffer has invalid size, should be deviceable by " + fullDataSize);
	}	

	while (i < buff.length -1) {
		currentDesc = bufferDesc[j];
		value = buff['read' + currentDesc.type](i);
		values.push( value );
		i += currentDesc.size / 8;
		j = ( j + 1 ) % bufferDesc.length;
		
		if (j === 0) {
			result = Object.create(Data.prototype); // create instance
			Data.apply(result, values); // call c-tor
			results.push( result );
			values = [];
		}
	}

	

	return results;
}


var buf = new Buffer([ 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC,
			0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC 
			]);

console.log( char2Data( buf ) );