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- /* ====================================================================
- 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.hssf.record;
-
- import java.io.ByteArrayOutputStream;
- import java.util.Arrays;
- import java.util.Map;
- import java.util.function.Function;
- import java.util.function.Supplier;
- import java.util.stream.Collectors;
-
- import org.apache.poi.common.Duplicatable;
- import org.apache.poi.common.usermodel.GenericRecord;
- import org.apache.poi.util.GenericRecordJsonWriter;
- import org.apache.poi.util.GenericRecordUtil;
- import org.apache.poi.util.IOUtils;
- import org.apache.poi.util.LittleEndianInput;
- import org.apache.poi.util.LittleEndianOutput;
- import org.apache.poi.util.LittleEndianOutputStream;
-
- /**
- * Subrecords are part of the OBJ class.
- */
- public abstract class SubRecord implements Duplicatable, GenericRecord {
-
- public enum SubRecordTypes {
- UNKNOWN(-1, UnknownSubRecord::new),
- END(0x0000, EndSubRecord::new),
- GROUP_MARKER(0x0006, GroupMarkerSubRecord::new),
- FT_CF(0x0007, FtCfSubRecord::new),
- FT_PIO_GRBIT(0x0008, FtPioGrbitSubRecord::new),
- EMBEDDED_OBJECT_REF(0x0009, EmbeddedObjectRefSubRecord::new),
- FT_CBLS(0x000C, FtCblsSubRecord::new),
- NOTE_STRUCTURE(0x000D, NoteStructureSubRecord::new),
- LBS_DATA(0x0013, LbsDataSubRecord::new),
- COMMON_OBJECT_DATA(0x0015, CommonObjectDataSubRecord::new),
- ;
-
- @FunctionalInterface
- public interface RecordConstructor<T extends SubRecord> {
- /**
- * read a sub-record from the supplied stream
- *
- * @param in the stream to read from
- * @param cmoOt the objectType field of the containing CommonObjectDataSubRecord,
- * we need it to propagate to next sub-records as it defines what data follows
- * @return the created sub-record
- */
- T apply(LittleEndianInput in, int size, int cmoOt);
- }
-
- private static final Map<Short,SubRecordTypes> LOOKUP =
- Arrays.stream(values()).collect(Collectors.toMap(SubRecordTypes::getSid, Function.identity()));
-
- public final short sid;
- public final RecordConstructor<?> recordConstructor;
-
- SubRecordTypes(int sid, RecordConstructor<?> recordConstructor) {
- this.sid = (short)sid;
- this.recordConstructor = recordConstructor;
- }
-
- public static SubRecordTypes forSID(int sid) {
- return LOOKUP.getOrDefault((short)sid, UNKNOWN);
- }
-
- public short getSid() {
- return sid;
- }
- }
-
-
- //arbitrarily selected; may need to increase
- private static final int MAX_RECORD_LENGTH = 1_000_000;
-
- protected SubRecord() {}
-
- protected SubRecord(SubRecord other) {}
-
- /**
- * read a sub-record from the supplied stream
- *
- * @param in the stream to read from
- * @param cmoOt the objectType field of the containing CommonObjectDataSubRecord,
- * we need it to propagate to next sub-records as it defines what data follows
- * @return the created sub-record
- */
- public static SubRecord createSubRecord(LittleEndianInput in, int cmoOt) {
- int sid = in.readUShort();
- // Often (but not always) the datasize for the sub-record
- int size = in.readUShort();
- SubRecordTypes srt = SubRecordTypes.forSID(sid);
- return srt.recordConstructor.apply(in, size, srt == SubRecordTypes.UNKNOWN ? sid : cmoOt);
- }
-
- @Override
- public final String toString() {
- return GenericRecordJsonWriter.marshal(this);
- }
-
- /**
- * @return the size of the data for this record (which is always 4 bytes less than the total
- * record size). Note however, that ushort encoded after the record sid is usually but not
- * always the data size.
- */
- protected abstract int getDataSize();
- public byte[] serialize() {
- int size = getDataSize() + 4;
- ByteArrayOutputStream baos = new ByteArrayOutputStream(size);
- serialize(new LittleEndianOutputStream(baos));
- if (baos.size() != size) {
- throw new RuntimeException("write size mismatch");
- }
- return baos.toByteArray();
- }
-
- public abstract void serialize(LittleEndianOutput out);
-
-
- /**
- * Whether this record terminates the sub-record stream.
- * There are two cases when this method must be overridden and return <code>true</code>
- * - EndSubRecord (sid = 0x00)
- * - LbsDataSubRecord (sid = 0x12)
- *
- * @return whether this record is the last in the sub-record stream
- */
- public boolean isTerminating(){
- return false;
- }
-
- private static final class UnknownSubRecord extends SubRecord {
-
- private final int _sid;
- private final byte[] _data;
-
- public UnknownSubRecord(LittleEndianInput in, int size, int sid) {
- _sid = sid;
- byte[] buf = IOUtils.safelyAllocate(size, MAX_RECORD_LENGTH);
- in.readFully(buf);
- _data = buf;
- }
- @Override
- protected int getDataSize() {
- return _data.length;
- }
- @Override
- public void serialize(LittleEndianOutput out) {
- out.writeShort(_sid);
- out.writeShort(_data.length);
- out.write(_data);
- }
-
- @Override
- public UnknownSubRecord copy() {
- return this;
- }
-
- @Override
- public SubRecordTypes getGenericRecordType() {
- return SubRecordTypes.UNKNOWN;
- }
-
- @Override
- public Map<String, Supplier<?>> getGenericProperties() {
- return GenericRecordUtil.getGenericProperties(
- "sid", () -> _sid,
- "data", () -> _data
- );
- }
- }
-
- @Override
- public abstract SubRecord copy();
-
- @Override
- public abstract SubRecordTypes getGenericRecordType();
- }
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