/*
* Copyright (c) 2006, 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.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
/**
* @test
* @bug 4879507
* @summary ZipInputStream does not check CRC for stored (uncompressed) files
* @author Dave Bristor
*/
import java.io.*;
import java.util.Arrays;
import java.util.zip.*;
public class StoredCRC {
public static void realMain(String[] args) throws Throwable {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ZipOutputStream zos = new ZipOutputStream(baos);
ZipEntry ze = new ZipEntry("test");
ze.setMethod(ZipOutputStream.STORED);
String writtenString = "hello, world";
byte[] writtenData = writtenString.getBytes("ASCII");
ze.setSize(writtenData.length);
CRC32 crc = new CRC32();
crc.update(writtenData);
ze.setCrc(crc.getValue());
zos.putNextEntry(ze);
zos.write(writtenData, 0, writtenData.length);
zos.close();
byte[] data = baos.toByteArray();
// Run with an arg to create a test file that can be used to figure
// out what position in the data stream can be changed.
if (args.length > 0) {
FileOutputStream fos = new FileOutputStream("stored.zip");
fos.write(data, 0, data.length);
fos.close();
} else {
// Test that reading byte-at-a-time works
ZipInputStream zis = new ZipInputStream(
new ByteArrayInputStream(data));
ze = zis.getNextEntry();
int pos = 0;
byte[] readData = new byte[256];
try {
int count = zis.read(readData, pos, 1);
while (count > 0) {
count = zis.read(readData, ++pos, 1);
}
check(writtenString.equals(new String(readData, 0, pos, "ASCII")));
} catch (Throwable t) {
unexpected(t);
}
// Test that data corruption is detected. Offset 39 was
// determined to be in the entry's uncompressed data.
data[39] ^= 1;
zis = new ZipInputStream(
new ByteArrayInputStream(data));
ze = zis.getNextEntry();
try {
zis.read(readData, 0, readData.length);
fail("Did not catch expected ZipException" );
} catch (ZipException ex) {
String msg = ex.getMessage();
check(msg != null && msg.startsWith("invalid entry CRC (expected 0x"));
} catch (Throwable t) {
unexpected(t);
}
}
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0, failed = 0;
static boolean pass() {passed++; return true;}
static boolean fail() {failed++; Thread.dumpStack(); return false;}
static boolean fail(String msg) {System.out.println(msg); return fail();}
static void unexpected(Throwable t) {failed++; t.printStackTrace();}
static boolean check(boolean cond) {if (cond) pass(); else fail(); return cond;}
static boolean equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) return pass();
else return fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
try {realMain(args);} catch (Throwable t) {unexpected(t);}
System.out.println("\nPassed = " + passed + " failed = " + failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}