fix for changes to Buffer.prototype.write signature change between node version. closes gh#66

lib/writer.js

@@ -3,7 +3,7 @@
 //same buffer to avoid memcpy and limit memory allocations
 var Writer = function(size) {
   this.size = size || 1024;
-  this.buffer = new Buffer(this.size + 5);
+  this.buffer = Buffer(this.size + 5);
   this.offset = 5;
   this.headerPosition = 0;
 };
@@ -36,6 +36,18 @@ p.addInt16 = function(num) {
   return this;
 }
 
+//for versions of node requiring 'length' as 3rd argument to buffer.write
+var writeString = function(buffer, string, offset, len) {
+  buffer.write(string, offset, len);
+}
+
+//overwrite function for older versions of node
+if(Buffer.prototype.write.length === 3) {
+  writeString = function(buffer, string, offset, len) {
+    buffer.write(string, offset);
+  }
+}
+
 p.addCString = function(string) {
   //just write a 0 for empty or null strings
   if(!string) {
@@ -43,7 +55,7 @@ p.addCString = function(string) {
   } else {
     var len = Buffer.byteLength(string);
     this._ensure(len + 1); //+1 for null terminator
-    this.buffer.write(string, this.offset, len);
+    writeString(this.buffer, string, this.offset, len);
     this.offset += len;
   }
 
@@ -53,7 +65,7 @@ p.addCString = function(string) {
 
 p.addChar = function(char) {
   this._ensure(1);
-  this.buffer.write(char, this.offset, 1);
+  writeString(this.buffer, char, this.offset, 1);
   this.offset++;
   return this;
 }