start to split into node commonjs style modules

- no longer is the global Bitcoin used for modules
- cleaner and more maintainable code
- add more tests

src/convert.js

@@ -0,0 +1,59 @@
+// 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
+