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test/jdk/java/io/InputStream/Skip.java
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*** 1,7 ****
/*
! * 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.
--- 1,7 ----
/*
! * Copyright (c) 1997, 2018 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.
*** 21,39 ****
* questions.
*/
/* @test
! @bug 4016710
! @summary check for correct implementation of InputStream.skip
*/
import java.io.*;
public class Skip{
private static void dotest(InputStream in , int curpos ,
long total , long toskip , long expected)
throws Exception
{
--- 21,41 ----
* questions.
*/
/* @test
! @bug 4016710 6516099
! @summary check for correct implementation of InputStream.skip{NBytes}
*/
import java.io.*;
public class Skip{
+ private static final int EOF = -1;
+
private static void dotest(InputStream in , int curpos ,
long total , long toskip , long expected)
throws Exception
{
*** 59,68 ****
--- 61,108 ----
throw new RuntimeException("Unexpected "+e+" is thrown!");
}
}
+ private static void dotestExact(MyInputStream in , int curpos ,
+ long total , long toskip)
+ throws Exception
+ {
+
+ try {
+
+ System.err.println("\n\nCurrently at pos = " + curpos +
+ "\nTotal bytes in the Stream = " + total +
+ "\nNumber of bytes to skip = " + toskip);
+
+ try {
+ long pos = in.position();
+ assert pos == curpos : pos + " != " + curpos;
+ in.skipNBytes(toskip);
+ if (in.position() != pos + (toskip < 0 ? 0 : toskip)) {
+ throw new RuntimeException((in.position() - pos) +
+ " bytes skipped; expected " + toskip);
+ }
+ } catch (EOFException eofe) {
+ if (!(toskip > 0 &&
+ (curpos == EOF || (curpos + toskip > total)))) {
+ throw new RuntimeException("Unexpected EOFException", eofe);
+ }
+
+ System.err.println("Caught expected EOFException");
+
+ return;
+ }
+
+ } catch (IOException e) {
+ System.err.println("IOException is thrown - possible result");
+ } catch (Throwable e) {
+ throw new RuntimeException("Unexpected "+e+" is thrown!");
+ }
+
+ }
+
public static void main( String argv[] ) throws Exception {
MyInputStream in = new MyInputStream(11);
/* test for negative skip */
*** 70,82 ****
/* check for skip beyond EOF starting from before EOF */
dotest(in, 0, 11, 20, 11);
/* check for skip after EOF */
! dotest(in, -1, 11, 20, 0);
in = new MyInputStream(9000);
/* check for skip equal to the read chunk size in InputStream.java */
dotest(in, 0, 9000, 2048, 2048);
/* check for skip greater than the read chunk size in InputStream.java */
dotest(in, 2048, 9000, 5000, 5000);
--- 110,123 ----
/* check for skip beyond EOF starting from before EOF */
dotest(in, 0, 11, 20, 11);
/* check for skip after EOF */
! dotest(in, EOF, 11, 20, 0);
in = new MyInputStream(9000);
+
/* check for skip equal to the read chunk size in InputStream.java */
dotest(in, 0, 9000, 2048, 2048);
/* check for skip greater than the read chunk size in InputStream.java */
dotest(in, 2048, 9000, 5000, 5000);
*** 96,126 ****
* long toskip = total - (long)6;
* in = new MyInputStream(total);
* dotest(in, 0, total, toskip, toskip);
*/
}
}
class MyInputStream extends InputStream {
! private int readctr = 0;
private long endoffile;
public MyInputStream(long endoffile) {
this.endoffile = endoffile;
}
public int read() {
if (readctr == endoffile) {
! return -1;
}
else {
readctr++;
return 0;
}
}
public int available() { return 0; }
}
--- 137,189 ----
* long toskip = total - (long)6;
* in = new MyInputStream(total);
* dotest(in, 0, total, toskip, toskip);
*/
+ /* tests for skipping an exact number of bytes */
+
+ in = new MyInputStream(11);
+
+ /* test for negative skip */
+ dotestExact(in, 0, 11, -23);
+
+ /* test for zero skip */
+ dotestExact(in, 0, 11, 0);
+
+ /* test for skip before EOF */
+ dotestExact(in, 0, 11, 5);
+
+ /* check for skip beyond EOF starting from before EOF */
+ dotestExact(in, 5, 11, 7);
+
+ /* check for skip from / after EOF */
+ dotestExact(in, EOF, 11, 1);
}
}
class MyInputStream extends InputStream {
! private static final int EOF = -1;
!
! private long readctr = 0;
private long endoffile;
public MyInputStream(long endoffile) {
this.endoffile = endoffile;
}
public int read() {
if (readctr == endoffile) {
! return EOF;
}
else {
readctr++;
return 0;
}
}
public int available() { return 0; }
+
+ public long position() { return readctr; }
}
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