add ram(buf) constructor

random-access-storage · Aug 2, 2016 · e0f01be · e0f01be
1 parent 19d8504
commit e0f01be
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diff --git a/README.md b/README.md
@@ -21,6 +21,12 @@ file.write(0, Buffer('hello'), function () {
 })
 ```
 
+You can also initialize a `ram` instance with a `Buffer`:
+
+```js
+var file = ram(Buffer('hello world'))
+```
+
 ## License
 
 MIT
diff --git a/index.js b/index.js
@@ -3,11 +3,11 @@ var AbstractRandomAccess = require('abstract-random-access')
 
 module.exports = RandomAccessMemory
 
-function RandomAccessMemory () {
+function RandomAccessMemory (buf) {
   if (!(this instanceof RandomAccessMemory)) return new RandomAccessMemory()
   AbstractRandomAccess.call(this)
-  this.buffer = Buffer(0)
-  this.length = 0
+  this.buffer = buf || Buffer(0)
+  this.length = this.buffer.length
 }
 
 inherits(RandomAccessMemory, AbstractRandomAccess)

diff --git a/test.js b/test.js
@@ -56,3 +56,12 @@ tape('random access write and read', function (t) {
     })
   })
 })
+
+tape('buffer constructor', function (t) {
+  var file = ram(Buffer('contents'))
+  file.read(0, 7, function (err, buf) {
+    t.error(err)
+    t.deepEqual(buf, Buffer('content'))
+    t.end()
+  })
+})