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test/jdk/java/io/RandomAccessFile/SetLength.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.
*** 20,82 ****
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
! @summary General tests of the setLength method -- Should migrate to 1.2 JCK
*/
! import java.io.*;
public class SetLength {
! static void fail(String s) {
! throw new RuntimeException(s);
! }
! static void go(File fn, int max) throws IOException {
! int chunk = max / 4;
! long i;
! RandomAccessFile f;
!
! f = new RandomAccessFile(fn, "rw");
! f.setLength(2 * chunk);
! if (f.length() != 2 * chunk) fail("Length not increased to " + (2 * chunk));
! if ((i = f.getFilePointer()) != 0) fail("File pointer shifted to " + i);
! byte[] buf = new byte[max];
! f.write(buf);
! if (f.length() != max) fail("Write didn't work");
! if (f.getFilePointer() != max) fail("File pointer inconsistent");
! f.setLength(3 * chunk);
! if (f.length() != 3 * chunk) fail("Length not reduced to " + 3 * chunk);
! if (f.getFilePointer() != 3 * chunk) fail("File pointer not shifted to " + (3 * chunk));
! f.seek(1 * chunk);
! if (f.getFilePointer() != 1 * chunk) fail("File pointer not shifted to " + (1 * chunk));
! f.setLength(2 * chunk);
! if (f.length() != 2 * chunk) fail("Length not reduced to " + (2 * chunk));
! if (f.getFilePointer() != 1 * chunk) fail("File pointer not shifted to " + (1 * chunk));
! f.close();
}
! public static void main(String[] args) throws IOException {
! File fn = new File("x.SetLength");
! try {
! go(fn, 20);
! fn.delete();
! go(fn, 64 * 1024);
! RandomAccessFile f = new RandomAccessFile(fn, "r");
! boolean thrown = false;
try {
! f.setLength(3);
! } catch (IOException x) {
! thrown = true;
}
- if (!thrown) fail("setLength succeeded on a file opened read-only");
- f.close();
}
! finally {
! fn.delete();
}
}
}
--- 20,165 ----
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
! * @bug 8204310
! * @summary General tests of the setLength method
! * @library /test/lib
! * @build jdk.test.lib.RandomFactory
! * @run main SetLength
! * @key randomness
*/
! import java.io.IOException;
! import java.io.File;
! import java.io.RandomAccessFile;
+ import jdk.test.lib.RandomFactory;
public class SetLength {
! static void checkState(RandomAccessFile f, long expectedFilePointer,
! long expectedLength)
! throws IOException
! {
! long filePointer = f.getFilePointer();
! long length = f.length();
! if (length != expectedLength) {
! throw new RuntimeException("File length " + length + " != expected "
! + expectedLength);
! }
! if (filePointer != expectedFilePointer) {
! throw new RuntimeException("File pointer " + filePointer
! + " != expected " + expectedFilePointer);
! }
! }
!
! static void test(RandomAccessFile f, long quarterLength)
! throws IOException
! {
! long halfLength = 2 * quarterLength;
! long threeQuarterLength = 3 * quarterLength;
! long fullLength = 4 * quarterLength;
!
! // initially, empty file
! checkState(f, 0, 0);
!
! // extending the file size
! f.setLength(halfLength);
! checkState(f, 0, halfLength);
!
! // writing from the begining
! f.write(new byte[(int)fullLength]);
! checkState(f, fullLength, fullLength);
!
! // setting to the same length
! f.setLength(fullLength);
! checkState(f, fullLength, fullLength);
!
! // truncating the file
! f.setLength(threeQuarterLength);
! checkState(f, threeQuarterLength, threeQuarterLength);
!
! // changing the file pointer
! f.seek(quarterLength);
! checkState(f, quarterLength, threeQuarterLength);
!
! // truncating the file again
! f.setLength(halfLength);
! checkState(f, quarterLength, halfLength);
!
! // writing from the middle with extending the file
! f.write(new byte[(int)halfLength]);
! checkState(f, threeQuarterLength, threeQuarterLength);
!
! // changing the file pointer
! f.seek(quarterLength);
! checkState(f, quarterLength, threeQuarterLength);
!
! // writing from the middle without extending the file
! f.write(new byte[(int)quarterLength]);
! checkState(f, halfLength, threeQuarterLength);
!
! // changing the file pointer to the end of file
! f.seek(threeQuarterLength);
! checkState(f, threeQuarterLength, threeQuarterLength);
!
! // writing to the end of file
! f.write(new byte[(int)quarterLength]);
! checkState(f, fullLength, fullLength);
!
! // truncating the file to zero
! f.setLength(0);
! checkState(f, 0, 0);
!
! // changing the file pointer beyond the end of file
! f.seek(threeQuarterLength);
! checkState(f, threeQuarterLength, 0);
!
! // writing beyont the end of file
! f.write(new byte[(int)quarterLength]);
! checkState(f, fullLength, fullLength);
! // negative file pointer
! try {
! f.seek(-1);
! throw new RuntimeException("IOE not thrown");
! } catch (IOException expected) {
}
+ checkState(f, fullLength, fullLength);
! // truncating the file after failed seek
! f.setLength(halfLength);
! checkState(f, halfLength, halfLength);
!
! // truncating after closing
! f.close();
try {
! f.setLength(halfLength);
! throw new RuntimeException("IOE not thrown");
! } catch (IOException expected) {
}
}
!
! public static void main(String[] args) throws IOException {
! File f28b = new File("f28b");
! File f28K = new File("f28K");
! File frnd = new File("frnd");
!
! try (RandomAccessFile raf28b = new RandomAccessFile(f28b, "rw");
! RandomAccessFile raf28K = new RandomAccessFile(f28K, "rw");
! RandomAccessFile rafrnd = new RandomAccessFile(frnd, "rw")) {
! test(raf28b, 7);
! test(raf28K, 7 * 1024);
! test(rafrnd, 1 + RandomFactory.getRandom().nextInt(16000));
! }
!
! // truncating read-only file
! try (RandomAccessFile raf28b = new RandomAccessFile(f28b, "r")) {
! raf28b.setLength(42);
! throw new RuntimeException("IOE not thrown");
! } catch (IOException expected) {
}
}
}
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