src/share/classes/java/util/jar/Manifest.java

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@@ -398,10 +398,12 @@
         }
 
         public byte peek() throws IOException {
             if (pos == count)
                 fill();
+            if (pos == count)
+                return -1; // nothing left in buffer
             return buf[pos];
         }
 
         public int readLine(byte[] b) throws IOException {
             return readLine(b, 0, b.length);