78 lines
2.5 KiB
Java
78 lines
2.5 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hdgf.pointers;
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import org.apache.poi.util.LittleEndian;
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/**
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* A Pointer from v6+
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*/
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public final class PointerV6 extends Pointer {
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public boolean destinationHasStrings() {
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return (0x40 <= format && format < 0x50);
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}
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public boolean destinationHasPointers() {
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if(type == 20) return true;
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if(format == 0x1d || format == 0x1e) return true;
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return (0x50 <= format && format < 0x60);
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}
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public boolean destinationHasChunks() {
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return (0xd0 <= format && format < 0xdf);
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}
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public boolean destinationCompressed() {
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// Apparently, it's the second least significant bit
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return (format & 2) > 0;
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}
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/**
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* With v6 pointers, the on-disk size is 18 bytes
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*/
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public int getSizeInBytes() { return 18; }
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/**
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* Stored within the data
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*/
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public int getNumPointersOffset(byte[] data) {
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return getNumPointersOffsetV6(data);
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}
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public static int getNumPointersOffsetV6(byte[] data) {
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// V6 stores it as the first value in the stream
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return (int)LittleEndian.getUInt(data, 0);
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}
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/**
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* 32 bit int at the given offset
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*/
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public int getNumPointers(int offset, byte[] data) {
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return getNumPointersV6(offset, data);
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}
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public static int getNumPointersV6(int offset, byte[] data) {
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// V6 stores it a 32 bit number at the offset
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return (int)LittleEndian.getUInt(data, offset);
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}
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/**
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* 4 bytes of the number, and 4 more unknown bytes
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*/
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public int getPostNumPointersSkip() {
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return getPostNumPointersSkipV6();
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}
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public static int getPostNumPointersSkipV6() {
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return 8;
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}
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}
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