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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.hwpf.sprm;
import java.util.List;
import org.apache.poi.util.*;
@Internal
public final class SprmUtils {
//arbitrarily selected; may need to increase
private static final int DEFAULT_MAX_RECORD_LENGTH = 100_000;
static int MAX_RECORD_LENGTH = DEFAULT_MAX_RECORD_LENGTH;
/**
* @param length the max record length allowed for SPRM data
*/
public static void setMaxRecordLength(int length) {
MAX_RECORD_LENGTH = length;
}
/**
* @return the max record length allowed for SPRM data
*/
public static int getMaxRecordLength() {
return MAX_RECORD_LENGTH;
}
public SprmUtils() {}
/**
* @deprecated unused by POI internally
*/
@Removal(version= "6.0.0")
public static byte[] shortArrayToByteArray(short[] convert) {
byte[] buf = IOUtils.safelyAllocate(convert.length * (long)LittleEndianConsts.SHORT_SIZE, MAX_RECORD_LENGTH);
for (int x = 0; x < convert.length; x++)
{
LittleEndian.putShort(buf, x * LittleEndianConsts.SHORT_SIZE, convert[x]);
}
return buf;
}
public static int addSpecialSprm(short instruction, byte[] varParam, List<byte[]> list)
{
byte[] sprm = new byte[varParam.length + 4];
System.arraycopy(varParam, 0, sprm, 4, varParam.length);
LittleEndian.putShort(sprm, 0, instruction);
LittleEndian.putShort(sprm, 2, (short)(varParam.length + 1));
list.add(sprm);
return sprm.length;
}
public static int addSprm( short instruction, boolean param,
List<byte[]> list )
{
return addSprm( instruction, param ? 1 : 0, null, list );
}
public static int addSprm(short instruction, int param, byte[] varParam, List<byte[]> list)
{
int type = (instruction & 0xe000) >> 13;
byte[] sprm = null;
switch(type)
{
case 0:
case 1:
sprm = new byte[3];
sprm[2] = (byte)param;
break;
case 2:
sprm = new byte[4];
LittleEndian.putShort(sprm, 2, (short)param);
break;
case 3:
sprm = new byte[6];
LittleEndian.putInt(sprm, 2, param);
break;
case 4:
case 5:
sprm = new byte[4];
LittleEndian.putShort(sprm, 2, (short)param);
break;
case 6:
assert(varParam != null);
sprm = new byte[3 + varParam.length];
sprm[2] = (byte)varParam.length;
System.arraycopy(varParam, 0, sprm, 3, varParam.length);
break;
case 7:
sprm = new byte[5];
// this is a three byte int so it has to be handled special
byte[] temp = new byte[4];
LittleEndian.putInt(temp, 0, param);
System.arraycopy(temp, 0, sprm, 2, 3);
break;
default:
//should never happen
throw new IllegalStateException("Invalid sprm type");
}
LittleEndian.putShort(sprm, 0, instruction);
list.add(sprm);
return sprm.length;
}
public static byte[] getGrpprl(List<byte[]> sprmList, int size)
{
// spit out the final grpprl
byte[] grpprl = IOUtils.safelyAllocate(size, MAX_RECORD_LENGTH);
int listSize = sprmList.size() - 1;
int index = 0;
for (; listSize >= 0; listSize--)
{
byte[] sprm = sprmList.remove(0);
System.arraycopy(sprm, 0, grpprl, index, sprm.length);
index += sprm.length;
}
return grpprl;
}
public static int convertBrcToInt(short[] brc)
{
byte[] buf = new byte[4];
LittleEndian.putShort(buf, 0, brc[0]);
LittleEndian.putShort(buf, LittleEndianConsts.SHORT_SIZE, brc[1]);
return LittleEndian.getInt(buf);
}
}
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