115 lines
3.4 KiB
Java
115 lines
3.4 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hslf.record;
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import java.io.IOException;
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import java.io.OutputStream;
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import org.apache.poi.util.LittleEndian;
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/**
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* Tne atom that holds the seed info used by a ExObjList
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*
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* @author Nick Burch
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*/
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public class ExObjListAtom extends RecordAtom
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{
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/**
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* Record header.
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*/
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private byte[] _header;
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/**
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* Record data.
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*/
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private byte[] _data;
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/**
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* Constructs a brand new link related atom record.
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*/
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protected ExObjListAtom() {
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_header = new byte[8];
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_data = new byte[4];
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LittleEndian.putShort(_header, 2, (short)getRecordType());
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LittleEndian.putInt(_header, 4, _data.length);
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// It is fine for the other values to be zero
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}
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/**
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* Constructs the link related atom record from its
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* source data.
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*
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* @param source the source data as a byte array.
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* @param start the start offset into the byte array.
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* @param len the length of the slice in the byte array.
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*/
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protected ExObjListAtom(byte[] source, int start, int len) {
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// Get the header.
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_header = new byte[8];
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System.arraycopy(source,start,_header,0,8);
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// Get the record data.
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_data = new byte[len-8];
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System.arraycopy(source,start+8,_data,0,len-8);
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// Must be at least 4 bytes long
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if(_data.length < 4) {
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throw new IllegalArgumentException("The length of the data for a ExObjListAtom must be at least 4 bytes, but was only " + _data.length);
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}
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}
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/**
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* Gets the object ID seed, which will be used as the unique
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* OLE identifier for the next OLE object added
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* @return the object ID seed
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*/
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public long getObjectIDSeed() {
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return LittleEndian.getUInt(_data,0);
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}
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/**
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* Sets the object ID seed
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* @param seed the new ID seed
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*/
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public void setObjectIDSeed(int seed) {
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LittleEndian.putInt(_data,0,seed);
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}
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/**
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* Gets the record type.
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* @return the record type.
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*/
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public long getRecordType() { return RecordTypes.ExObjListAtom.typeID; }
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/**
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* Write the contents of the record back, so it can be written
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* to disk
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*
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* @param out the output stream to write to.
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* @throws IOException if an error occurs.
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*/
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public void writeOut(OutputStream out) throws IOException {
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out.write(_header);
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out.write(_data);
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}
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}
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