INIT

addons/gdfxr/Base58.gd

@@ -0,0 +1,38 @@
+extends Object
+
+const BASE_58_ALPHABET := "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
+
+
+static func b58decode(v: String) -> StreamPeerBuffer:
+	# Base 58 is a number expressed in the base-58 numeral system.
+	# When encoding data, big-endian is used and leading zeros are encoded as leading `1`s.
+
+	var original_length := v.length()
+	v = v.lstrip(BASE_58_ALPHABET[0])
+	var zeros := original_length - v.length()
+	
+	var buffer := PackedByteArray()
+	buffer.resize(v.length())  # Won't be as long as base 58 string since the buffer is 256-based.
+	buffer.fill(0)
+	
+	var length := 0
+	for c in v:
+		var carry := BASE_58_ALPHABET.find(c)
+		if carry == -1:
+			return null
+		var i := 0
+		while carry != 0 or i < length:
+			var pos := buffer.size() - 1 - i
+			carry += 58 * buffer[pos]
+			buffer[pos] = carry % 256
+			carry /= 256
+			i += 1
+		length = i
+	
+	var result := StreamPeerBuffer.new()
+	for _i in zeros:
+		result.put_8(0)
+	result.put_data(buffer.slice(buffer.size() - length))
+	result.seek(0)
+	
+	return result