// convert to/from various values

var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

// Convert a byte array to a hex string
module.exports.bytesToHex = function(bytes) {
		for (var hex = [], i = 0; i < bytes.length; i++) {
			hex.push((bytes[i] >>> 4).toString(16));
			hex.push((bytes[i] & 0xF).toString(16));
		}
		return hex.join("");
};

// Convert a hex string to a byte array
module.exports.hexToBytes = function(hex) {
		for (var bytes = [], c = 0; c < hex.length; c += 2)
			bytes.push(parseInt(hex.substr(c, 2), 16));
		return bytes;
}

	// Convert a byte array to a base-64 string
module.exports.bytesToBase64 = function(bytes) {
		// Use browser-native function if it exists
		if (typeof btoa == "function") return btoa(Binary.bytesToString(bytes));

		for(var base64 = [], i = 0; i < bytes.length; i += 3) {
			var triplet = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];
			for (var j = 0; j < 4; j++) {
				if (i * 8 + j * 6 <= bytes.length * 8)
					base64.push(base64map.charAt((triplet >>> 6 * (3 - j)) & 0x3F));
				else base64.push("=");
			}
		}

		return base64.join("");
}


	// Convert a base-64 string to a byte array
module.exports.base64ToBytes = function(base64) {
		// Use browser-native function if it exists
		if (typeof atob == "function") return Binary.stringToBytes(atob(base64));

		// Remove non-base-64 characters
		base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");

		for (var bytes = [], i = 0, imod4 = 0; i < base64.length; imod4 = ++i % 4) {
			if (imod4 == 0) continue;
			bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & (Math.pow(2, -2 * imod4 + 8) - 1)) << (imod4 * 2)) |
			           (base64map.indexOf(base64.charAt(i)) >>> (6 - imod4 * 2)));
		}

		return bytes;
}

// utf8 and binary?
//stringToBytes
//bytesToString