| /* ==================================================================== |
| 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.hdgf.streams.PointerContainingStream; |
| import org.apache.poi.util.LittleEndian; |
| |
| /** |
| * Factor class to create the appropriate pointers, based on the version |
| * of the file |
| */ |
| public final class PointerFactory { |
| private int version; |
| public PointerFactory(int version) { |
| this.version = version; |
| } |
| public int getVersion() { return version; } |
| |
| /** |
| * Creates a single Pointer from the data at the given offset |
| */ |
| public Pointer createPointer(byte[] data, int offset) { |
| Pointer p; |
| if(version >= 6) { |
| p = new PointerV6(); |
| p.type = LittleEndian.getInt(data, offset+0); |
| p.address = (int)LittleEndian.getUInt(data, offset+4); |
| p.offset = (int)LittleEndian.getUInt(data, offset+8); |
| p.length = (int)LittleEndian.getUInt(data, offset+12); |
| p.format = LittleEndian.getShort(data, offset+16); |
| |
| return p; |
| } else if(version == 5) { |
| p = new PointerV5(); |
| p.type = LittleEndian.getShort(data, offset+0); |
| p.format = LittleEndian.getShort(data, offset+2); |
| p.address = (int)LittleEndian.getUInt(data, offset+4); |
| p.offset = (int)LittleEndian.getUInt(data, offset+8); |
| p.length = (int)LittleEndian.getUInt(data, offset+12); |
| |
| return p; |
| } else { |
| throw new IllegalArgumentException("Visio files with versions below 5 are not supported, yours was " + version); |
| } |
| } |
| |
| /** |
| * Parsers the {@link PointerContainingStream} contents and |
| * creates all the child Pointers for it |
| */ |
| public Pointer[] createContainerPointers(Pointer parent, byte[] data) { |
| // Where in the stream does the "number of pointers" offset live? |
| int numPointersOffset = parent.getNumPointersOffset(data); |
| // How many do we have? |
| int numPointers = parent.getNumPointers(numPointersOffset, data); |
| // How much to skip for the num pointers + any extra data? |
| int skip = parent.getPostNumPointersSkip(); |
| |
| // Create |
| int pos = numPointersOffset + skip; |
| Pointer[] childPointers = new Pointer[numPointers]; |
| for(int i=0; i<numPointers; i++) { |
| childPointers[i] = this.createPointer(data, pos); |
| pos += childPointers[i].getSizeInBytes(); |
| } |
| |
| return childPointers; |
| } |
| } |