Integrate new minicap along with a moderate rewrite. What's currently missing is recovering from socket death.

lib/units/device/plugins/screen/util/frameparser.js

@@ -0,0 +1,56 @@
+var stream = require('stream')
+var util = require('util')
+
+function FrameParser() {
+  this.readFrameBytes = 0
+  this.frameBodyLength = 0
+  this.frameBody = new Buffer(0)
+  stream.Transform.call(this)
+}
+
+util.inherits(FrameParser, stream.Transform)
+
+FrameParser.prototype._transform = function(chunk, encoding, done) {
+  var cursor, len, bytesLeft
+
+  for (cursor = 0, len = chunk.length; cursor < len;) {
+    if (this.readFrameBytes < 4) {
+      this.frameBodyLength +=
+        (chunk[cursor] << (this.readFrameBytes * 8)) >>> 0
+      cursor += 1
+      this.readFrameBytes += 1
+    }
+    else {
+      bytesLeft = len - cursor
+
+      if (bytesLeft >= this.frameBodyLength) {
+        this.frameBody = Buffer.concat([
+          this.frameBody
+        , chunk.slice(cursor, cursor + this.frameBodyLength)
+        ])
+
+        this.push(this.frameBody)
+
+        cursor += this.frameBodyLength
+        this.frameBodyLength = this.readFrameBytes = 0
+        this.frameBody = new Buffer(0)
+      }
+      else {
+        // @todo Consider/benchmark continuation frames to prevent
+        // potential Buffer thrashing.
+        this.frameBody = Buffer.concat([
+          this.frameBody
+        , chunk.slice(cursor, len)
+        ])
+
+        this.frameBodyLength -= bytesLeft
+        this.readFrameBytes += bytesLeft
+        cursor = len
+      }
+    }
+  }
+
+  return done()
+}
+
+module.exports = FrameParser