79 lines
2.5 KiB
Java
79 lines
2.5 KiB
Java
/*
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* Copyright (c) 2000, 2017, 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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/*
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* @test
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* @bug 4393174
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* @summary Checks that ImageIO.write(..., ..., File) truncates the file
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*/
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.FileOutputStream;
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import javax.imageio.ImageIO;
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public class ImageIOWriteFile {
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public static void main(String[] args) {
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long length0 = -1L;
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long length1 = -1L;
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try {
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BufferedImage bi =
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new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
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File outFile = File.createTempFile("imageiowritefile", ".tmp");
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// Write image to an empty file
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outFile.delete();
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ImageIO.write(bi, "png", outFile);
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length0 = outFile.length();
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// Write a larger file full of junk
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outFile.delete();
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FileOutputStream fos = new FileOutputStream(outFile);
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for (int i = 0; i < length0*2; i++) {
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fos.write(1);
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}
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fos.close();
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// Write image again
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ImageIO.write(bi, "png", outFile);
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length1 = outFile.length();
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outFile.delete();
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} catch (Exception e) {
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e.printStackTrace();
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throw new RuntimeException("Unexpected exception!");
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}
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if (length0 == 0) {
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throw new RuntimeException("File length is zero!");
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}
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if (length1 != length0) {
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throw new RuntimeException("File length changed!");
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}
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}
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}
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