mimic SlowBuffer and Buffer#parent just enough to pass node's tests

diff --git a/index.js b/index.js
index 0cc3546073c2a5b22704c9563b208f47a451f95b..2637df0fc23d753c7bfd8441a69f8edd1f120d0a 100644 (file)
--- a/index.js
+++ b/index.js
@@ -10,11 +10,12 @@ var ieee754 = require('ieee754')
 var isArray = require('is-array')
 
 exports.Buffer = Buffer
-exports.SlowBuffer = Buffer
+exports.SlowBuffer = SlowBuffer
 exports.INSPECT_MAX_BYTES = 50
 Buffer.poolSize = 8192 // not used by this implementation
 
 var kMaxLength = 0x3fffffff
+var rootParent = {}
 
 /**
  * If `Buffer.TYPED_ARRAY_SUPPORT`:
@@ -120,6 +121,18 @@ function Buffer (subject, encoding, noZero) {
     }
   }
 
+  if (length > 0 && length <= Buffer.poolSize)
+    buf.parent = rootParent
+
+  return buf
+}
+
+function SlowBuffer(subject, encoding, noZero) {
+  if (!(this instanceof SlowBuffer))
+    return new SlowBuffer(subject, encoding, noZero)
+
+  var buf = new Buffer(subject, encoding, noZero)
+  delete buf.parent
   return buf
 }
 
@@ -502,16 +515,21 @@ Buffer.prototype.slice = function (start, end) {
   if (end < start)
     end = start
 
+  var newBuf
   if (Buffer.TYPED_ARRAY_SUPPORT) {
-    return Buffer._augment(this.subarray(start, end))
+    newBuf = Buffer._augment(this.subarray(start, end))
   } else {
     var sliceLen = end - start
-    var newBuf = new Buffer(sliceLen, undefined, true)
+    newBuf = new Buffer(sliceLen, undefined, true)
     for (var i = 0; i < sliceLen; i++) {
       newBuf[i] = this[i + start]
     }
-    return newBuf
   }
+
+  if (newBuf.length)
+    newBuf.parent = this.parent || this
+
+  return newBuf
 }
 
 /*