diff --git a/core/src/main/java/hudson/model/LargeText.java b/core/src/main/java/hudson/model/LargeText.java
index cb94c70137ce7fcb6db3cd4208b2e1804ec11e68..8a6380101720af6fb93e4466d7e0caba5a4f7246 100644
--- a/core/src/main/java/hudson/model/LargeText.java
+++ b/core/src/main/java/hudson/model/LargeText.java
@@ -15,6 +15,8 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.RandomAccessFile;
 import java.io.Writer;
+import java.io.Reader;
+import java.io.InputStreamReader;
 
 /**
  * Represents a large text data.
@@ -79,6 +81,29 @@ public class LargeText {
         return completed;
     }
 
+    /**
+     * Returns {@link Reader} for reading the raw bytes.
+     */
+    public Reader readAll() throws IOException {
+        return new InputStreamReader(new InputStream() {
+            final Session session = source.open();
+            public int read() throws IOException {
+                byte[] buf = new byte[1];
+                int n = session.read(buf);
+                if(n==1)    return buf[0];
+                else        return -1; // EOF
+            }
+
+            public int read(byte[] buf, int off, int len) throws IOException {
+                return session.read(buf,off,len);
+            }
+
+            public void close() throws IOException {
+                session.close();
+            }
+        });
+    }
+
     /**
      * Writes the tail portion of the file to the {@link Writer}.
      *