115 lines
3.6 KiB
Java
115 lines
3.6 KiB
Java
/*
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* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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@bug 4027717
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@summary Check for correct implementation of RandomAccessFile.skipBytes
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*/
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import java.io.*;
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public class SkipBytes{
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/*
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* doTest attempts to skip num_to_skip bytes in raf starting from position 0.
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* It also does a read after the skip to check if EOF has been reached
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* correctly or incorrectly.
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*/
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private static void doTest(RandomAccessFile raf, int start, int num_to_skip)
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throws Exception
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{
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raf.seek(start);
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long cur_ptr = raf.getFilePointer();
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int length = (int) raf.length();
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System.err.println("\nCurrent pointer = " + cur_ptr + " length = " +
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length + " num_to_skip = " + num_to_skip);
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//Do the Skip test
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int num_skipped = raf.skipBytes(num_to_skip);
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System.err.println("After skipBytes -- no. skipped = " + num_skipped);
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// if num_to_skip is negative do the negative skip test
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if (num_to_skip <= 0) {
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if (num_skipped != 0){
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System.err.println("Negative Skip Test Failed");
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throw new RuntimeException("Negative Skip Test Failed");
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}
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else {
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System.err.println("Negative Skip Test Succeeded");
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}
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}
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cur_ptr = raf.getFilePointer();
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System.err.println("Current pointer = " + cur_ptr);
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// Check if skip has gone beyond EOF.
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if (cur_ptr > length) {
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System.err.println("Past EOF Skip Test Failed");
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throw new RuntimeException("Past EOF Skip Test Failed");
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}
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else {
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System.err.println("Past EOF Skip Test Succeeded");
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}
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// do read test
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int byte_read = raf.read();
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if ( (cur_ptr == length) &&
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(byte_read != -1) ) {
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System.err.println("byte_read = " + byte_read +
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" Read Test Failed ......");
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throw new RuntimeException("Read Test Failed");
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}
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else {
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System.err.println("byte_read = " + byte_read +
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" Read Test Succeeded");
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}
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}
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public static void main(String[] args) throws Exception {
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RandomAccessFile raf = new RandomAccessFile("input.txt" , "rw");
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try {
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int length = (int)raf.length();
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doTest(raf , 0 , 2*length);
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doTest(raf , 0 , length);
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doTest(raf , 0 , length/2);
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doTest(raf , length/2 , -2);
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doTest(raf , length , 0);
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doTest(raf , 0 , -1);
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} finally{
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raf.close();
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}
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}
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}
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