re PR java/14446 (GZIPInputStream: corrupted gzip file - crc mismatch)

PR libgcj/14446:
	* java/util/zip/GZIPInputStream.java (read): Avoid sign extension
	when comparing CRCs.
	* java/util/zip/InflaterInputStream.java (onebytebuffer): New
	field.
	(read()): New overload.

From-SVN: r87882

libjava/java/util/zip/InflaterInputStream.java

@@ -70,6 +70,9 @@ public class InflaterInputStream extends FilterInputStream
    */
   protected int len;
 
+  // We just use this if we are decoding one byte at a time with the
+  // read() call.
+  private byte[] onebytebuffer = new byte[1];
 
   /**
    * Create an InflaterInputStream with the default decompresseor
@@ -155,6 +158,19 @@ public class InflaterInputStream extends FilterInputStream
     inf.setInput(buf, 0, len);
   }
 
+  /**
+   * Reads one byte of decompressed data.
+   *
+   * The byte is in the lower 8 bits of the int.
+   */
+  public int read() throws IOException
+  { 
+    int nread = read(onebytebuffer, 0, 1);
+    if (nread > 0)
+      return onebytebuffer[0] & 0xff;
+    return -1;
+  }
+
   /**
    * Decompresses data into the byte array
    *