/* ====================================================================
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.hdgf.pointers;
import org.apache.poi.util.LittleEndian;
/**
* A Pointer from v6+
*/
public final class PointerV6 extends Pointer {
public boolean destinationHasStrings() {
return isFormatBetween(0x40, 0x50);
}
public boolean destinationHasPointers() {
return (getType() == 20) || isFormatBetween(0x1d, 0x1f) || isFormatBetween(0x50, 0x60);
}
public boolean destinationHasChunks() {
return isFormatBetween(0xd0, 0xdf);
}
public boolean destinationCompressed() {
// Apparently, it's the second least significant bit
return (getFormat() & 2) > 0;
}
/**
* With v6 pointers, the on-disk size is 18 bytes
*/
public int getSizeInBytes() { return 18; }
/**
* Stored within the data
*/
public int getNumPointersOffset(byte[] data) {
return getNumPointersOffsetV6(data);
}
public static int getNumPointersOffsetV6(byte[] data) {
// V6 stores it as the first value in the stream
return (int)LittleEndian.getUInt(data, 0);
}
/**
* 32 bit int at the given offset
*/
public int getNumPointers(int offset, byte[] data) {
return getNumPointersV6(offset, data);
}
public static int getNumPointersV6(int offset, byte[] data) {
// V6 stores it a 32 bit number at the offset
return (int)LittleEndian.getUInt(data, offset);
}
/**
* 4 bytes of the number, and 4 more unknown bytes
*/
public int getPostNumPointersSkip() {
return getPostNumPointersSkipV6();
}
public static int getPostNumPointersSkipV6() {
return 8;
}
}