| /* ==================================================================== |
| 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 (0x40 <= format && format < 0x50); |
| } |
| public boolean destinationHasPointers() { |
| if(type == 20) return true; |
| if(format == 0x1d || format == 0x1e) return true; |
| return (0x50 <= format && format < 0x60); |
| } |
| public boolean destinationHasChunks() { |
| return (0xd0 <= format && format < 0xdf); |
| } |
| |
| public boolean destinationCompressed() { |
| // Apparently, it's the second least significant bit |
| return (format & 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; |
| } |
| } |