104 lines
3.6 KiB
Java
104 lines
3.6 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.streams;
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import org.apache.poi.hdgf.chunks.ChunkFactory;
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import org.apache.poi.hdgf.pointers.Pointer;
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import org.apache.poi.hdgf.pointers.PointerFactory;
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import org.apache.poi.util.LittleEndian;
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/**
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* A stream that holds pointers, possibly in addition to some
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* other data too.
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*/
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public class PointerContainingStream extends Stream {
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private Pointer[] childPointers;
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private Stream[] childStreams;
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private ChunkFactory chunkFactory;
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private PointerFactory pointerFactory;
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private int numPointersLocalOffset;
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protected PointerContainingStream(Pointer pointer, StreamStore store, ChunkFactory chunkFactory, PointerFactory pointerFactory) {
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super(pointer, store);
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this.chunkFactory = chunkFactory;
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this.pointerFactory = pointerFactory;
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// Find the offset to the number of child pointers we have
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// This ought to be the first thing stored in us
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numPointersLocalOffset = (int)LittleEndian.getUInt(
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store.getContents(), 0
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);
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// Generate the objects for the pointers we contain
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int numPointers = (int)LittleEndian.getUInt(
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store.getContents(), numPointersLocalOffset
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);
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childPointers = new Pointer[numPointers];
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// After the number of pointers is another (unknown)
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// 4 byte value
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int pos = numPointersLocalOffset + 4 + 4;
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// Now create the pointer objects
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for(int i=0; i<numPointers; i++) {
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childPointers[i] = pointerFactory.createPointer(
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store.getContents(), pos
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);
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pos += childPointers[i].getSizeInBytes();
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}
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}
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/**
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* Returns all the pointers that we contain
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*/
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protected Pointer[] getChildPointers() { return childPointers; }
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/**
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* Returns all the "child" streams.
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* These are all the streams pointed to by the pointers
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* that we contain.
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*/
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public Stream[] getPointedToStreams() { return childStreams; }
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/**
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* Performs a recursive search, identifying the pointers we contain,
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* creating the Streams for where they point to, then searching
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* those if appropriate.
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*/
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public void findChildren(byte[] documentData) {
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// For each pointer, generate the Stream it points to
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childStreams = new Stream[childPointers.length];
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for(int i=0; i<childPointers.length; i++) {
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Pointer ptr = childPointers[i];
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childStreams[i] = Stream.createStream(ptr, documentData, chunkFactory, pointerFactory);
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// Process chunk streams into their chunks
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if(childStreams[i] instanceof ChunkStream) {
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ChunkStream child = (ChunkStream)childStreams[i];
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child.findChunks();
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}
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// Recurse into pointer containing streams
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if(childStreams[i] instanceof PointerContainingStream) {
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PointerContainingStream child =
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(PointerContainingStream)childStreams[i];
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child.findChildren(documentData);
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}
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}
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}
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}
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