/*
* Copyright (c) 1997, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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* questions.
*/
/* @test
@bug 4085938
@summary Check for the correct behaviour of DataInputStream.skipBytes
*/
import java.io.*;
public class SkipBytes{
private static void dotest(DataInputStream dis, int pos, int total,
int toskip, int expected) {
try {
System.err.println("\n\nTotal bytes in the stream = " + total);
System.err.println("Currently at position = " + pos);
System.err.println("Bytes to skip = " + toskip);
System.err.println("Expected result = " + expected);
int skipped = dis.skipBytes(toskip);
System.err.println("Actual skipped = " + skipped);
if (skipped != expected) {
throw new RuntimeException
("DataInputStream.skipBytes does not return expected value");
}
} catch(EOFException e){
throw new RuntimeException
("DataInputStream.skipBytes throws unexpected EOFException");
} catch (IOException e) {
System.err.println("IOException is thrown - possible result");
}
}
public static void main(String args[]) throws Exception {
DataInputStream dis = new DataInputStream(new MyInputStream());
dotest(dis, 0, 11, -1, 0);
dotest(dis, 0, 11, 5, 5);
System.err.println("\n***CAUTION**** - may go into an infinite loop");
dotest(dis, 5, 11, 20, 6);
}
}
class MyInputStream extends InputStream {
private int readctr = 0;
public int read() {
if (readctr > 10){
return -1;
}
else{
readctr++;
return 0;
}
}
public int available() { return 0; }
}