| /* ==================================================================== |
| 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.poi.hslf.record; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.util.Arrays; |
| import java.util.Map; |
| import java.util.function.Supplier; |
| |
| import org.apache.poi.util.GenericRecordJsonWriter; |
| import org.apache.poi.util.GenericRecordUtil; |
| import org.apache.poi.util.IOUtils; |
| import org.apache.poi.util.LittleEndian; |
| import org.apache.poi.util.StringUtil; |
| |
| /** |
| * A TextCharsAtom (type 4000). Holds text in byte swapped unicode form. |
| * The trailing return character is always stripped from this |
| */ |
| |
| public final class TextCharsAtom extends RecordAtom { |
| public static final long _type = RecordTypes.TextCharsAtom.typeID; |
| //arbitrarily selected; may need to increase |
| private static final int MAX_RECORD_LENGTH = 1_000_000; |
| |
| private byte[] _header; |
| |
| /** The bytes that make up the text */ |
| private byte[] _text; |
| |
| /** Grabs the text. */ |
| public String getText() { |
| return StringUtil.getFromUnicodeLE(_text); |
| } |
| |
| /** Updates the text in the Atom. */ |
| public void setText(String text) { |
| // Convert to little endian unicode |
| _text = IOUtils.safelyAllocate(text.length() * 2L, MAX_RECORD_LENGTH); |
| StringUtil.putUnicodeLE(text,_text,0); |
| |
| // Update the size (header bytes 5-8) |
| LittleEndian.putInt(_header,4,_text.length); |
| } |
| |
| /* *************** record code follows ********************** */ |
| |
| /** |
| * For the TextChars Atom |
| */ |
| protected TextCharsAtom(byte[] source, int start, int len) { |
| // Sanity Checking |
| if(len < 8) { len = 8; } |
| |
| // Get the header |
| _header = Arrays.copyOfRange(source, start, start+8); |
| |
| // Grab the text |
| _text = IOUtils.safelyClone(source, start+8, len-8, MAX_RECORD_LENGTH); |
| } |
| /** |
| * Create an empty TextCharsAtom |
| */ |
| public TextCharsAtom() { |
| // 0 length header |
| _header = new byte[] { 0, 0, 0xA0-256, 0x0f, 0, 0, 0, 0 }; |
| // Empty text |
| _text = new byte[0]; |
| } |
| |
| /** |
| * We are of type 4000 |
| */ |
| @Override |
| public long getRecordType() { return _type; } |
| |
| /** |
| * Write the contents of the record back, so it can be written |
| * to disk |
| */ |
| @Override |
| public void writeOut(OutputStream out) throws IOException { |
| // Header - size or type unchanged |
| out.write(_header); |
| |
| // Write out our text |
| out.write(_text); |
| } |
| |
| /** |
| * dump debug info; use getText() to return a string |
| * representation of the atom |
| */ |
| @Override |
| public String toString() { |
| return GenericRecordJsonWriter.marshal(this); |
| } |
| |
| @Override |
| public Map<String, Supplier<?>> getGenericProperties() { |
| return GenericRecordUtil.getGenericProperties( |
| "text", this::getText |
| ); |
| } |
| } |