Let FileStream support bytesRead.

.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+package-lock.json

lib/types/multipart.js

@@ -200,6 +200,8 @@ function Multipart(boy, cfg) {
             cb();
           }
         });
+
+        file.bytesRead = 0;
         file._read = function(n) {
           if (!self._pause)
             return;
@@ -222,6 +224,7 @@ function Multipart(boy, cfg) {
             part.removeAllListeners('data');
           } else if (!file.push(data))
             self._pause = true;
+          file.bytesRead = nsize > fileSizeLimit? fileSizeLimit: nsize;
         };
 
         onEnd = function() {

package.json

@@ -1,4 +1,5 @@
-{ "name": "busboy",
+{
+  "name": "busboy",
   "version": "0.2.14",
   "author": "Brian White <[email protected]>",
   "description": "A streaming parser for HTML form data for node.js",
@@ -10,8 +11,23 @@
   "scripts": {
     "test": "node test/test.js"
   },
-  "engines": { "node": ">=0.8.0" },
-  "keywords": [ "uploads", "forms", "multipart", "form-data" ],
-  "licenses": [ { "type": "MIT", "url": "http://github.com/mscdex/busboy/raw/master/LICENSE" } ],
-  "repository" : { "type": "git", "url": "http://github.com/mscdex/busboy.git" }
+  "engines": {
+    "node": ">=0.8.0"
+  },
+  "keywords": [
+    "uploads",
+    "forms",
+    "multipart",
+    "form-data"
+  ],
+  "licenses": [
+    {
+      "type": "MIT",
+      "url": "http://github.com/mscdex/busboy/raw/master/LICENSE"
+    }
+  ],
+  "repository": {
+    "type": "git",
+    "url": "http://github.com/mscdex/busboy.git"
+  }
 }

test/test-types-multipart.js

@@ -299,6 +299,8 @@ function next() {
         info[2] = nb;
         if (stream.truncated)
           ++info[3];
+
+        assert(typeof(stream.bytesRead) === 'number', makeMsg('file.bytesRead', 'is missing'))
       });
     });
   }