org.apache.tika.parser.wordperfect.WPPrefixAreaExtractor Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tika.parser.wordperfect;
import java.io.IOException;
/**
* Extracts WordPerfect Prefix Area data from a WordPerfect document.
* Applies to both 5.x and 6+ documents.
* @author Pascal Essiembre
*/
final class WPPrefixAreaExtractor {
private WPPrefixAreaExtractor() {
super();
}
//WP5.x:
// Prefix Area: 16 bytes (standard header)
//WP6.x:
// Prefix Area: 30 bytes (16 standard header + 14 index header)
public static WPPrefixArea extract(WPInputStream in)
throws IOException {
WPPrefixArea prefixArea = new WPPrefixArea();
in.mark(30);
prefixArea.setFileId(in.readWPString(4)); // 1-4
prefixArea.setDocAreaPointer(in.readWPLong()); // 5-8
prefixArea.setProductType(in.readWP()); // 9
prefixArea.setFileType(in.readWPChar()); // 10
prefixArea.setMajorVersion(in.readWP()); // 11
prefixArea.setMinorVersion(in.readWP()); // 12
prefixArea.setEncrypted(in.readWPShort() != 0); // 13-14
prefixArea.setIndexAreaPointer(in.readWPShort()); // 15-16
// only applies to 6.x:
prefixArea.setFileSize(-1);
if (prefixArea.getMajorVersion() == WPPrefixArea.WP6_MAJOR_VERSION) {
try {
in.skip(4); // 4 reserved bytes: skip // 17-20
prefixArea.setFileSize(in.readWPLong()); // 21-24
} catch (IOException e) {
// May fail if no index header, which is fine.
}
}
in.reset();
return prefixArea;
}
}