/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* See LICENSE.txt included in this distribution for the specific
* language governing permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at LICENSE.txt.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
*/
package org.opensolaris.opengrok.analysis.archive;
import java.io.IOException;
import java.io.InputStream;
import org.opensolaris.opengrok.analysis.FileAnalyzer;
import org.opensolaris.opengrok.analysis.FileAnalyzer.Genre;
import org.opensolaris.opengrok.analysis.FileAnalyzerFactory;
import org.opensolaris.opengrok.analysis.executables.JarAnalyzerFactory;
public final class ZipAnalyzerFactory extends FileAnalyzerFactory {
private static final String name = "Zip";
private static final String[] SUFFIXES = {
"ZIP"
};
private static final byte[] MAGIC = {'P', 'K', 3, 4};
// Derived from /usr/src/cmd/file/file.c in OpenSolaris
private static final Matcher MATCHER = new Matcher() {
private static final int LOCHDRSIZ = 30;
private int CH(byte[] b, int n) {
return b[n] & 0xff;
}
private int SH(byte[] b, int n) {
return CH(b, n) | (CH(b, n+1) << 8);
}
private int LOCNAM(byte[] b) {
return SH(b, 26);
}
private int LOCEXT(byte[] b) {
return SH(b, 28);
}
private static final int XFHSIZ = 4;
@Override
public FileAnalyzerFactory isMagic(byte[] contents, InputStream in)
throws IOException {
assert in.markSupported();
if (contents.length < MAGIC.length) {
return null;
}
for (int i = 0; i < MAGIC.length; i++) {
if (contents[i] != MAGIC[i]) {
return null;
}
}
byte[] buf = new byte[1024];
in.mark(buf.length);
int len = in.read(buf);
in.reset();
int xoff = LOCHDRSIZ + LOCNAM(buf);
int xoff_end = Math.min(len, xoff + LOCEXT(buf));
while ((xoff < xoff_end) && (len - xoff >= XFHSIZ)) {
int xfhid = SH(buf, xoff);
if (xfhid == 0xCAFE) {
return JarAnalyzerFactory.DEFAULT_INSTANCE;
}
int xfdatasiz = SH(buf, xoff + 2);
xoff += XFHSIZ + xfdatasiz;
}
return ZipAnalyzerFactory.DEFAULT_INSTANCE;
}
};
public static final ZipAnalyzerFactory DEFAULT_INSTANCE =
new ZipAnalyzerFactory();
private ZipAnalyzerFactory() {
super(null, null, SUFFIXES, null, MATCHER, null, Genre.XREFABLE, name);
}
@Override
protected FileAnalyzer newAnalyzer() {
return new ZipAnalyzer(this);
}
}