feature(files) add readPipe

lib/server/files.js

@@ -12,6 +12,7 @@
     var main        = global.cloudcmd.main,
         fs          = main.fs,
         path        = main.path,
+        pipe        = main.pipe,
         CloudFunc   = main.cloudfunc,
         Util        = main.util;
     
@@ -67,4 +68,30 @@
         }
     };
     
+    object.readPipe     = readPipe;
+
+    function readPipe(files, writeStream, callback) {
+        var name, length = files && files.length;
+        
+        if (!length)
+            Util.exec(callback);
+        else {
+            name = files.pop();
+            
+            pipe.create({
+                from    : name,
+                write   : writeStream,
+                callback: function(error) {
+                    if (error)
+                        Util.exec(callback, error);
+                    else
+                        if (!length)
+                            Util.exec(callback);
+                        else
+                            readPipe(files, writeStream, callback);
+                }
+            });
+        }
+    }
+    
 })(this);