Added concat()

Fixes toots/buffer-browserify#6

diff --git a/index.js b/index.js
index b13ca2d4331f7a63e41a2abf6d93672ca3561b9a..258695d888f007b32a768be655409bc3db35c3dc 100644 (file)
--- a/index.js
+++ b/index.js
@@ -392,6 +392,39 @@ Buffer.isBuffer = function isBuffer(b) {
   return b instanceof Buffer || b instanceof SlowBuffer;
 };
 
+Buffer.concat = function (list, totalLength) {
+  if (!Array.isArray(list)) {
+    throw new Error("Usage: Buffer.concat(list, [totalLength])\n \
+      list should be an Array.");
+  }
+
+  if (list.length === 0) {
+    return new Buffer(0);
+  } else if (list.length === 1) {
+    return list[0];
+  }
+
+  if (typeof totalLength !== 'number') {
+    totalLength = 0;
+    for (var i = 0; i < list.length; i++) {
+      var buf = list[i];
+      totalLength += buf.length;
+    }
+  }
+
+  var buffer = new Buffer(totalLength);
+  var pos = 0;
+  for (var i = 0; i < list.length; i++) {
+    var buf = list[i];
+    // To deal with string objects
+    if (!Buffer.isBuffer(buf)) {
+      buf = new Buffer(buf);
+    }
+    buf.copy(buffer, pos);
+    pos += buf.length;
+  }
+  return buffer;
+};
 
 // Inspect
 Buffer.prototype.inspect = function inspect() {