First commit, most of the backend system! :)

lib/mcpc_buffer.js

@@ -0,0 +1,81 @@
+function CustomBuffer(existingBuffer) {
+    var buffer = existingBuffer || new Buffer(48);
+    var offset = 0;
+
+    this.writeVarInt = function(val) {
+        while (true) {
+            if ((val & 0xFFFFFF80) == 0) {
+                this.writeUByte(val);
+
+                return;
+            }
+
+            this.writeUByte(val & 0x7F | 0x80);
+
+            val = val >>> 7;
+        }
+    };
+
+    this.writeString = function(string) {
+        this.writeVarInt(string.length);
+
+        if (offset + string.length >= buffer.length) {
+            Buffer.concat([buffer, new Buffer(string.length)]);
+        }
+
+        buffer.write(string, offset, string.length, "UTF-8");
+
+        offset += string.length;
+    };
+
+    this.writeUShort = function(val) {
+        this.writeUByte(val >> 8);
+        this.writeUByte(val & 0xFF);
+    };
+
+    this.writeUByte = function(val) {
+        if (offset + 1 >= buffer.length) {
+            Buffer.concat([buffer, new Buffer(50)]);
+        }
+
+        buffer.writeUInt8(val, offset++);
+    };
+
+    this.readVarInt = function() {
+        var val = 0;
+        var count = 0;
+
+        while (true) {
+            var i = buffer.readUInt8(offset++);
+
+            val |= (i & 0x7F) << count++ * 7;
+
+            if ((i & 0x80) != 128) {
+                break
+            }
+        }
+
+        return val;
+    };
+
+    this.readString = function() {
+        var length = this.readVarInt();
+        var str = buffer.toString("UTF-8", offset, offset + length);
+
+        offset += length;
+        
+        return str;
+    };
+
+    this.buffer = function() {
+        return buffer.slice(0, offset);
+    };
+
+    this.offset = function() {
+        return offset;
+    };
+}
+
+exports.createBuffer = function(buffer) {
+    return new CustomBuffer(buffer);
+};