code review 4607052: os.Error API: don't export os.ErrorString, use os.NewEr...

src/pkg/image/gif/reader.go

 // Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // Package gif implements a GIF image decoder.
 //
 // The GIF specification is at http://www.w3.org/Graphics/GIF/spec-gif89a.txt.
 package gif
 
 import (
@@ skipping 168 matching lines @@
                         if _, err = io.ReadFull(lzwr, m.Pix); err != nil {
                                 break
                         }
 
                         // There should be a "0" block remaining; drain that.
                         c, err = d.r.ReadByte()
                         if err != nil {
                                 return err
                         }
                         if c != 0 {
-                                return os.ErrorString("gif: extra data after image")
+                                return os.NewError("gif: extra data after image")
                         }
 
                         // Undo the interlacing if necessary.
                         d.uninterlace(m)
 
                         d.image = append(d.image, m)
                         d.delay = append(d.delay, d.delayTime)
                         d.delayTime = 0 // TODO: is this correct, or should we hold on to the value?
 
                 case sTrailer:
@@ skipping 212 matching lines @@
         var d decoder
         if err := d.decode(r, true); err != nil {
                 return image.Config{}, err
         }
         return image.Config{d.globalColorMap, d.width, d.height}, nil
 }
 
 func init() {
         image.RegisterFormat("gif", "GIF8?a", Decode, DecodeConfig)
 }