Add a test for fixed deflate algorithm

DEVSIX-8385

Author: vitali-pr

io/src/test/java/com/itextpdf/io/util/ZlibUtilTest.java

@@ -0,0 +1,78 @@
+/*
+    This file is part of the iText (R) project.
+    Copyright (c) 1998-2024 Apryse Group NV
+    Authors: Apryse Software.
+
+    This program is offered under a commercial and under the AGPL license.
+    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.
+
+    AGPL licensing:
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.itextpdf.io.util;
+
+import com.itextpdf.commons.utils.FileUtil;
+import com.itextpdf.commons.utils.ZipFileReader;
+import com.itextpdf.io.source.DeflaterOutputStream;
+import com.itextpdf.test.ExtendedITextTest;
+import com.itextpdf.test.annotations.type.IntegrationTest;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+
+@Category(IntegrationTest.class)
+public class ZlibUtilTest extends ExtendedITextTest {
+
+    private static final String SOURCE_FOLDER = "./src/test/resources/com/itextpdf/io/util/";
+    private static final String DESTINATION_FOLDER = "./target/test/com/itextpdf/io/util/";
+
+    @Before
+    public void setUp() {
+        createOrClearDestinationFolder(DESTINATION_FOLDER);
+    }
+
+    @Test
+    public void arrayIndexOutOfBoundsDeflateTest() throws Exception {
+        // Test file is taken from https://issues.jenkins.io/browse/JENKINS-19473
+        // Unzip test file first
+        try (ZipFileReader reader = new ZipFileReader(SOURCE_FOLDER + "jzlib.zip");
+             InputStream is = reader.readFromZip("jzlib.fail");
+             OutputStream os = FileUtil.getFileOutputStream(DESTINATION_FOLDER + "jzlib.fail")) {
+            byte[] buf = new byte[8192];
+            int length;
+            while ((length = is.read(buf)) != -1) {
+                os.write(buf, 0, length);
+            }
+        }
+
+        // Deflate it
+        try (InputStream is = FileUtil.getInputStreamForFile(DESTINATION_FOLDER + "jzlib.fail");
+             OutputStream os = FileUtil.getFileOutputStream(DESTINATION_FOLDER + "jzlib.fail.zz");
+             // -1 stands for default compression
+             DeflaterOutputStream zip = new DeflaterOutputStream(os, -1)) {
+            byte[] buf = new byte[8192];
+            int length;
+            while ((length = is.read(buf)) != -1) {
+                zip.write(buf, 0, length);
+            }
+        }
+
+        Assert.assertTrue(FileUtil.fileExists(DESTINATION_FOLDER + "jzlib.fail.zz"));
+        Assert.assertTrue(FileUtil.isFileNotEmpty(DESTINATION_FOLDER + "jzlib.fail.zz"));
+    }
+}