exports.read = function (buffer, offset, isLE, mLen, nBytes) {
	var e, m
	var eLen = (nBytes * 8) - mLen - 1
	var eMax = (1 << eLen) - 1
	var eBias = eMax >> 1
	var nBits = -7
	var i = isLE ? (nBytes - 1) : 0
	var d = isLE ? -1 : 1
	var s = buffer[offset + i]

	i += d

	e = s & ((1 << (-nBits)) - 1)
	s >>= (-nBits)
	nBits += eLen
	for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}

	m = e & ((1 << (-nBits)) - 1)
	e >>= (-nBits)
	nBits += mLen
	for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}

	if (e === 0) {
		e = 1 - eBias
	} else if (e === eMax) {
		return m ? NaN : ((s ? -1 : 1) * Infinity)
	} else {
		m = m + Math.pow(2, mLen)
		e = e - eBias
	}
	return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
	var e, m, c
	var eLen = (nBytes * 8) - mLen - 1
	var eMax = (1 << eLen) - 1
	var eBias = eMax >> 1
	var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
	var i = isLE ? 0 : (nBytes - 1)
	var d = isLE ? 1 : -1
	var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

	value = Math.abs(value)

	if (isNaN(value) || value === Infinity) {
		m = isNaN(value) ? 1 : 0
		e = eMax
	} else {
		e = Math.floor(Math.log(value) / Math.LN2)
		if (value * (c = Math.pow(2, -e)) < 1) {
			e--
			c *= 2
		}
		if (e + eBias >= 1) {
			value += rt / c
		} else {
			value += rt * Math.pow(2, 1 - eBias)
		}
		if (value * c >= 2) {
			e++
			c /= 2
		}

		if (e + eBias >= eMax) {
			m = 0
			e = eMax
		} else if (e + eBias >= 1) {
			m = ((value * c) - 1) * Math.pow(2, mLen)
			e = e + eBias
		} else {
			m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
			e = 0
		}
	}

	for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

	e = (e << mLen) | m
	eLen += mLen
	for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

	buffer[offset + i - d] |= s * 128
}