From 9163b6c404063b4d200ad4c3f85c47a1471c596a Mon Sep 17 00:00:00 2001
From: Michael Yang <mikkyangg@gmail.com>
Date: Fri, 10 Jan 2014 14:54:24 -0500
Subject: [PATCH] Move file end check to helper method

---
 id3.go  | 12 +++---------
 util.go |  8 +++++++-
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/id3.go b/id3.go
index 9d7ea58..dc10513 100644
--- a/id3.go
+++ b/id3.go
@@ -73,16 +73,10 @@ func (f *File) Close() error {
 		}
 	case (*v2.Tag):
 		if f.Size() > f.originalSize {
-			stat, err := f.file.Stat()
-			if err != nil {
-				return err
-			}
+			start := int64(f.originalSize + v2.HeaderSize)
+			offset := int64(f.Tagger.Size() - f.originalSize)
 
-			start := f.originalSize + v2.HeaderSize
-			end := stat.Size()
-			offset := f.Tagger.Size() - f.originalSize
-
-			if err := shiftBytesBack(f.file, int64(start), end, int64(offset)); err != nil {
+			if err := shiftBytesBack(f.file, start, offset); err != nil {
 				return err
 			}
 		}
diff --git a/util.go b/util.go
index d3ba20d..ae9ca2a 100644
--- a/util.go
+++ b/util.go
@@ -8,7 +8,13 @@ import (
 	"os"
 )
 
-func shiftBytesBack(file *os.File, start, end, offset int64) error {
+func shiftBytesBack(file *os.File, start, offset int64) error {
+	stat, err := file.Stat()
+	if err != nil {
+		return err
+	}
+	end := stat.Size()
+
 	wrBuf := make([]byte, offset)
 	rdBuf := make([]byte, offset)