mirror of https://github.com/apache/poi.git
Begin making NPOIFS the default #56791
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1678677 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch
parent
a790de551a
commit
573c77d3bd
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@ -37,8 +37,6 @@ import org.apache.poi.poifs.property.Property;
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/**
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* Simple implementation of DirectoryEntry
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*
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* @author Marc Johnson (mjohnson at apache dot org)
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*/
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public class DirectoryNode
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extends EntryNode
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@ -50,9 +48,9 @@ public class DirectoryNode
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// Our list of entries, kept sorted to preserve order
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private ArrayList<Entry> _entries;
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// Only one of these two will exist
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// the POIFSFileSystem we belong to
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private POIFSFileSystem _ofilesystem;
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// Only one of these two will exist
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// the OPOIFSFileSystem we belong to
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private OPOIFSFileSystem _ofilesystem;
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// the NPOIFSFileSytem we belong to
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private NPOIFSFileSystem _nfilesystem;
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@ -64,11 +62,11 @@ public class DirectoryNode
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* is intended strictly for the internal use of this package
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*
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* @param property the DirectoryProperty for this DirectoryEntry
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* @param filesystem the POIFSFileSystem we belong to
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* @param filesystem the OPOIFSFileSystem we belong to
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* @param parent the parent of this entry
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*/
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DirectoryNode(final DirectoryProperty property,
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final POIFSFileSystem filesystem,
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final OPOIFSFileSystem filesystem,
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final DirectoryNode parent)
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{
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this(property, parent, filesystem, (NPOIFSFileSystem)null);
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@ -86,12 +84,12 @@ public class DirectoryNode
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final NPOIFSFileSystem nfilesystem,
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final DirectoryNode parent)
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{
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this(property, parent, (POIFSFileSystem)null, nfilesystem);
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this(property, parent, (OPOIFSFileSystem)null, nfilesystem);
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}
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private DirectoryNode(final DirectoryProperty property,
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final DirectoryNode parent,
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final POIFSFileSystem ofilesystem,
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final OPOIFSFileSystem ofilesystem,
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final NPOIFSFileSystem nfilesystem)
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{
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super(property, parent);
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@ -147,8 +145,17 @@ public class DirectoryNode
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/**
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* @return the filesystem that this belongs to
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* TODO Temporary workaround during #56791
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*/
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public POIFSFileSystem getFileSystem()
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{
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return (POIFSFileSystem)_ofilesystem;
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}
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/**
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* @return the filesystem that this belongs to
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*/
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public OPOIFSFileSystem getOFileSystem()
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{
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return _ofilesystem;
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}
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@ -0,0 +1,607 @@
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/* ====================================================================
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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.poifs.filesystem;
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import java.io.ByteArrayInputStream;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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import org.apache.poi.poifs.common.POIFSBigBlockSize;
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import org.apache.poi.poifs.common.POIFSConstants;
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import org.apache.poi.poifs.dev.POIFSViewable;
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import org.apache.poi.poifs.property.DirectoryProperty;
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import org.apache.poi.poifs.property.Property;
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import org.apache.poi.poifs.property.PropertyTable;
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import org.apache.poi.poifs.storage.BATBlock;
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import org.apache.poi.poifs.storage.BlockAllocationTableReader;
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import org.apache.poi.poifs.storage.BlockAllocationTableWriter;
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import org.apache.poi.poifs.storage.BlockList;
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import org.apache.poi.poifs.storage.BlockWritable;
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import org.apache.poi.poifs.storage.HeaderBlock;
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import org.apache.poi.poifs.storage.HeaderBlockConstants;
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import org.apache.poi.poifs.storage.HeaderBlockWriter;
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import org.apache.poi.poifs.storage.RawDataBlockList;
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import org.apache.poi.poifs.storage.SmallBlockTableReader;
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import org.apache.poi.poifs.storage.SmallBlockTableWriter;
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import org.apache.poi.util.CloseIgnoringInputStream;
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import org.apache.poi.util.IOUtils;
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import org.apache.poi.util.LongField;
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import org.apache.poi.util.POILogFactory;
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import org.apache.poi.util.POILogger;
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/**
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* <p>This is the main class of the POIFS system; it manages the entire
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* life cycle of the filesystem.</p>
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* <p>This is the older version, which uses more memory, and doesn't
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* support in-place writes.</p>
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*/
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public class OPOIFSFileSystem
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implements POIFSViewable
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{
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private static final POILogger _logger =
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POILogFactory.getLogger(OPOIFSFileSystem.class);
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/**
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* Convenience method for clients that want to avoid the auto-close behaviour of the constructor.
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*/
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public static InputStream createNonClosingInputStream(InputStream is) {
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return new CloseIgnoringInputStream(is);
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}
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private PropertyTable _property_table;
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private List<POIFSViewable> _documents;
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private DirectoryNode _root;
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/**
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* What big block size the file uses. Most files
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* use 512 bytes, but a few use 4096
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*/
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private POIFSBigBlockSize bigBlockSize =
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POIFSConstants.SMALLER_BIG_BLOCK_SIZE_DETAILS;
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/**
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* Constructor, intended for writing
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*/
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public OPOIFSFileSystem()
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{
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HeaderBlock header_block = new HeaderBlock(bigBlockSize);
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_property_table = new PropertyTable(header_block);
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_documents = new ArrayList<POIFSViewable>();
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_root = null;
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}
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/**
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* Create a OPOIFSFileSystem from an <tt>InputStream</tt>. Normally the stream is read until
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* EOF. The stream is always closed.<p/>
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*
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* Some streams are usable after reaching EOF (typically those that return <code>true</code>
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* for <tt>markSupported()</tt>). In the unlikely case that the caller has such a stream
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* <i>and</i> needs to use it after this constructor completes, a work around is to wrap the
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* stream in order to trap the <tt>close()</tt> call. A convenience method (
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* <tt>createNonClosingInputStream()</tt>) has been provided for this purpose:
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* <pre>
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* InputStream wrappedStream = OPOIFSFileSystem.createNonClosingInputStream(is);
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* HSSFWorkbook wb = new HSSFWorkbook(wrappedStream);
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* is.reset();
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* doSomethingElse(is);
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* </pre>
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* Note also the special case of <tt>ByteArrayInputStream</tt> for which the <tt>close()</tt>
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* method does nothing.
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* <pre>
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* ByteArrayInputStream bais = ...
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* HSSFWorkbook wb = new HSSFWorkbook(bais); // calls bais.close() !
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* bais.reset(); // no problem
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* doSomethingElse(bais);
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* </pre>
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*
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* @param stream the InputStream from which to read the data
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*
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* @exception IOException on errors reading, or on invalid data
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*/
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public OPOIFSFileSystem(InputStream stream)
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throws IOException
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{
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this();
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boolean success = false;
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HeaderBlock header_block;
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RawDataBlockList data_blocks;
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try {
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// read the header block from the stream
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header_block = new HeaderBlock(stream);
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bigBlockSize = header_block.getBigBlockSize();
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// read the rest of the stream into blocks
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data_blocks = new RawDataBlockList(stream, bigBlockSize);
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success = true;
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} finally {
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closeInputStream(stream, success);
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}
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// set up the block allocation table (necessary for the
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// data_blocks to be manageable
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new BlockAllocationTableReader(header_block.getBigBlockSize(),
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header_block.getBATCount(),
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header_block.getBATArray(),
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header_block.getXBATCount(),
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header_block.getXBATIndex(),
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data_blocks);
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// get property table from the document
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PropertyTable properties =
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new PropertyTable(header_block, data_blocks);
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// init documents
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processProperties(
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SmallBlockTableReader.getSmallDocumentBlocks(
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bigBlockSize, data_blocks, properties.getRoot(),
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header_block.getSBATStart()
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),
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data_blocks,
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properties.getRoot().getChildren(),
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null,
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header_block.getPropertyStart()
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);
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// For whatever reason CLSID of root is always 0.
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getRoot().setStorageClsid(properties.getRoot().getStorageClsid());
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}
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/**
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* @param stream the stream to be closed
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* @param success <code>false</code> if an exception is currently being thrown in the calling method
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*/
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private void closeInputStream(InputStream stream, boolean success) {
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if(stream.markSupported() && !(stream instanceof ByteArrayInputStream)) {
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String msg = "POIFS is closing the supplied input stream of type ("
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+ stream.getClass().getName() + ") which supports mark/reset. "
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+ "This will be a problem for the caller if the stream will still be used. "
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+ "If that is the case the caller should wrap the input stream to avoid this close logic. "
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+ "This warning is only temporary and will not be present in future versions of POI.";
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_logger.log(POILogger.WARN, msg);
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}
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try {
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stream.close();
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} catch (IOException e) {
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if(success) {
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throw new RuntimeException(e);
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}
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// else not success? Try block did not complete normally
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// just print stack trace and leave original ex to be thrown
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e.printStackTrace();
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}
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}
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/**
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* Checks that the supplied InputStream (which MUST
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* support mark and reset, or be a PushbackInputStream)
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* has a POIFS (OLE2) header at the start of it.
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* If your InputStream does not support mark / reset,
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* then wrap it in a PushBackInputStream, then be
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* sure to always use that, and not the original!
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* @param inp An InputStream which supports either mark/reset, or is a PushbackInputStream
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*/
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public static boolean hasPOIFSHeader(InputStream inp) throws IOException {
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// We want to peek at the first 8 bytes
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byte[] header = IOUtils.peekFirst8Bytes(inp);
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return hasPOIFSHeader(header);
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}
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/**
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* Checks if the supplied first 8 bytes of a stream / file
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* has a POIFS (OLE2) header.
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*/
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public static boolean hasPOIFSHeader(byte[] header8Bytes) {
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LongField signature = new LongField(HeaderBlockConstants._signature_offset, header8Bytes);
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// Did it match the signature?
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return (signature.get() == HeaderBlockConstants._signature);
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}
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/**
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* Create a new document to be added to the root directory
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*
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* @param stream the InputStream from which the document's data
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* will be obtained
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* @param name the name of the new POIFSDocument
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*
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* @return the new DocumentEntry
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*
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* @exception IOException on error creating the new POIFSDocument
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*/
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public DocumentEntry createDocument(final InputStream stream,
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final String name)
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throws IOException
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{
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return getRoot().createDocument(name, stream);
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}
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/**
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* create a new DocumentEntry in the root entry; the data will be
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* provided later
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*
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* @param name the name of the new DocumentEntry
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* @param size the size of the new DocumentEntry
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* @param writer the writer of the new DocumentEntry
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*
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* @return the new DocumentEntry
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*
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* @exception IOException
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*/
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public DocumentEntry createDocument(final String name, final int size,
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final POIFSWriterListener writer)
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throws IOException
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{
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return getRoot().createDocument(name, size, writer);
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}
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/**
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* create a new DirectoryEntry in the root directory
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*
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* @param name the name of the new DirectoryEntry
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*
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* @return the new DirectoryEntry
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*
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* @exception IOException on name duplication
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*/
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public DirectoryEntry createDirectory(final String name)
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throws IOException
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{
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return getRoot().createDirectory(name);
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}
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/**
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* Write the filesystem out
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*
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* @param stream the OutputStream to which the filesystem will be
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* written
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*
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* @exception IOException thrown on errors writing to the stream
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*/
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public void writeFilesystem(final OutputStream stream)
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throws IOException
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{
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// get the property table ready
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_property_table.preWrite();
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// create the small block store, and the SBAT
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SmallBlockTableWriter sbtw =
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new SmallBlockTableWriter(bigBlockSize, _documents, _property_table.getRoot());
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// create the block allocation table
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BlockAllocationTableWriter bat =
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new BlockAllocationTableWriter(bigBlockSize);
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// create a list of BATManaged objects: the documents plus the
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// property table and the small block table
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List<Object> bm_objects = new ArrayList<Object>();
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bm_objects.addAll(_documents);
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bm_objects.add(_property_table);
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bm_objects.add(sbtw);
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bm_objects.add(sbtw.getSBAT());
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// walk the list, allocating space for each and assigning each
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// a starting block number
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Iterator<Object> iter = bm_objects.iterator();
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while (iter.hasNext())
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{
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BATManaged bmo = ( BATManaged ) iter.next();
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int block_count = bmo.countBlocks();
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if (block_count != 0)
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{
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bmo.setStartBlock(bat.allocateSpace(block_count));
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}
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else
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{
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// Either the BATManaged object is empty or its data
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// is composed of SmallBlocks; in either case,
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// allocating space in the BAT is inappropriate
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}
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}
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// allocate space for the block allocation table and take its
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// starting block
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int batStartBlock = bat.createBlocks();
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// get the extended block allocation table blocks
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HeaderBlockWriter header_block_writer = new HeaderBlockWriter(bigBlockSize);
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BATBlock[] xbat_blocks =
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header_block_writer.setBATBlocks(bat.countBlocks(),
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batStartBlock);
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// set the property table start block
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header_block_writer.setPropertyStart(_property_table.getStartBlock());
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// set the small block allocation table start block
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header_block_writer.setSBATStart(sbtw.getSBAT().getStartBlock());
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// set the small block allocation table block count
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header_block_writer.setSBATBlockCount(sbtw.getSBATBlockCount());
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// the header is now properly initialized. Make a list of
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// writers (the header block, followed by the documents, the
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// property table, the small block store, the small block
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// allocation table, the block allocation table, and the
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// extended block allocation table blocks)
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List<Object> writers = new ArrayList<Object>();
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writers.add(header_block_writer);
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writers.addAll(_documents);
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writers.add(_property_table);
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writers.add(sbtw);
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writers.add(sbtw.getSBAT());
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writers.add(bat);
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for (int j = 0; j < xbat_blocks.length; j++)
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{
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writers.add(xbat_blocks[ j ]);
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}
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// now, write everything out
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iter = writers.iterator();
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while (iter.hasNext())
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{
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BlockWritable writer = ( BlockWritable ) iter.next();
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writer.writeBlocks(stream);
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}
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}
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/**
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* read in a file and write it back out again
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*
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* @param args names of the files; arg[ 0 ] is the input file,
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* arg[ 1 ] is the output file
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*
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* @exception IOException
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*/
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public static void main(String args[])
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throws IOException
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{
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if (args.length != 2)
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{
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System.err.println(
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"two arguments required: input filename and output filename");
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System.exit(1);
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}
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FileInputStream istream = new FileInputStream(args[ 0 ]);
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FileOutputStream ostream = new FileOutputStream(args[ 1 ]);
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new OPOIFSFileSystem(istream).writeFilesystem(ostream);
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istream.close();
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ostream.close();
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}
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/**
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* get the root entry
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*
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* @return the root entry
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*/
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public DirectoryNode getRoot()
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{
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if (_root == null)
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{
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_root = new DirectoryNode(_property_table.getRoot(), this, null);
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}
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return _root;
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}
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/**
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* open a document in the root entry's list of entries
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*
|
||||
* @param documentName the name of the document to be opened
|
||||
*
|
||||
* @return a newly opened DocumentInputStream
|
||||
*
|
||||
* @exception IOException if the document does not exist or the
|
||||
* name is that of a DirectoryEntry
|
||||
*/
|
||||
|
||||
public DocumentInputStream createDocumentInputStream(
|
||||
final String documentName)
|
||||
throws IOException
|
||||
{
|
||||
return getRoot().createDocumentInputStream(documentName);
|
||||
}
|
||||
|
||||
/**
|
||||
* add a new POIFSDocument
|
||||
*
|
||||
* @param document the POIFSDocument being added
|
||||
*/
|
||||
|
||||
void addDocument(final POIFSDocument document)
|
||||
{
|
||||
_documents.add(document);
|
||||
_property_table.addProperty(document.getDocumentProperty());
|
||||
}
|
||||
|
||||
/**
|
||||
* add a new DirectoryProperty
|
||||
*
|
||||
* @param directory the DirectoryProperty being added
|
||||
*/
|
||||
|
||||
void addDirectory(final DirectoryProperty directory)
|
||||
{
|
||||
_property_table.addProperty(directory);
|
||||
}
|
||||
|
||||
/**
|
||||
* remove an entry
|
||||
*
|
||||
* @param entry to be removed
|
||||
*/
|
||||
|
||||
void remove(EntryNode entry)
|
||||
{
|
||||
_property_table.removeProperty(entry.getProperty());
|
||||
if (entry.isDocumentEntry())
|
||||
{
|
||||
_documents.remove((( DocumentNode ) entry).getDocument());
|
||||
}
|
||||
}
|
||||
|
||||
private void processProperties(final BlockList small_blocks,
|
||||
final BlockList big_blocks,
|
||||
final Iterator<Property> properties,
|
||||
final DirectoryNode dir,
|
||||
final int headerPropertiesStartAt)
|
||||
throws IOException
|
||||
{
|
||||
while (properties.hasNext())
|
||||
{
|
||||
Property property = properties.next();
|
||||
String name = property.getName();
|
||||
DirectoryNode parent = (dir == null)
|
||||
? (( DirectoryNode ) getRoot())
|
||||
: dir;
|
||||
|
||||
if (property.isDirectory())
|
||||
{
|
||||
DirectoryNode new_dir =
|
||||
( DirectoryNode ) parent.createDirectory(name);
|
||||
|
||||
new_dir.setStorageClsid( property.getStorageClsid() );
|
||||
|
||||
processProperties(
|
||||
small_blocks, big_blocks,
|
||||
(( DirectoryProperty ) property).getChildren(),
|
||||
new_dir, headerPropertiesStartAt);
|
||||
}
|
||||
else
|
||||
{
|
||||
int startBlock = property.getStartBlock();
|
||||
int size = property.getSize();
|
||||
POIFSDocument document = null;
|
||||
|
||||
if (property.shouldUseSmallBlocks())
|
||||
{
|
||||
document =
|
||||
new POIFSDocument(name,
|
||||
small_blocks.fetchBlocks(startBlock, headerPropertiesStartAt),
|
||||
size);
|
||||
}
|
||||
else
|
||||
{
|
||||
document =
|
||||
new POIFSDocument(name,
|
||||
big_blocks.fetchBlocks(startBlock, headerPropertiesStartAt),
|
||||
size);
|
||||
}
|
||||
parent.createDocument(document);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* ********** START begin implementation of POIFSViewable ********** */
|
||||
|
||||
/**
|
||||
* Get an array of objects, some of which may implement
|
||||
* POIFSViewable
|
||||
*
|
||||
* @return an array of Object; may not be null, but may be empty
|
||||
*/
|
||||
|
||||
public Object [] getViewableArray()
|
||||
{
|
||||
if (preferArray())
|
||||
{
|
||||
return (( POIFSViewable ) getRoot()).getViewableArray();
|
||||
}
|
||||
return new Object[ 0 ];
|
||||
}
|
||||
|
||||
/**
|
||||
* Get an Iterator of objects, some of which may implement
|
||||
* POIFSViewable
|
||||
*
|
||||
* @return an Iterator; may not be null, but may have an empty
|
||||
* back end store
|
||||
*/
|
||||
|
||||
public Iterator<Object> getViewableIterator()
|
||||
{
|
||||
if (!preferArray())
|
||||
{
|
||||
return (( POIFSViewable ) getRoot()).getViewableIterator();
|
||||
}
|
||||
return Collections.emptyList().iterator();
|
||||
}
|
||||
|
||||
/**
|
||||
* Give viewers a hint as to whether to call getViewableArray or
|
||||
* getViewableIterator
|
||||
*
|
||||
* @return true if a viewer should call getViewableArray, false if
|
||||
* a viewer should call getViewableIterator
|
||||
*/
|
||||
|
||||
public boolean preferArray()
|
||||
{
|
||||
return (( POIFSViewable ) getRoot()).preferArray();
|
||||
}
|
||||
|
||||
/**
|
||||
* Provides a short description of the object, to be used when a
|
||||
* POIFSViewable object has not provided its contents.
|
||||
*
|
||||
* @return short description
|
||||
*/
|
||||
|
||||
public String getShortDescription()
|
||||
{
|
||||
return "POIFS FileSystem";
|
||||
}
|
||||
|
||||
/**
|
||||
* @return The Big Block size, normally 512 bytes, sometimes 4096 bytes
|
||||
*/
|
||||
public int getBigBlockSize() {
|
||||
return bigBlockSize.getBigBlockSize();
|
||||
}
|
||||
/**
|
||||
* @return The Big Block size, normally 512 bytes, sometimes 4096 bytes
|
||||
*/
|
||||
public POIFSBigBlockSize getBigBlockSizeDetails() {
|
||||
return bigBlockSize;
|
||||
}
|
||||
|
||||
/* ********** END begin implementation of POIFSViewable ********** */
|
||||
} // end public class OPOIFSFileSystem
|
||||
|
||||
|
|
@ -61,6 +61,7 @@ import org.apache.poi.util.POILogger;
|
|||
*/
|
||||
|
||||
public class POIFSFileSystem
|
||||
extends OPOIFSFileSystem // TODO Temporary workaround during #56791
|
||||
implements POIFSViewable
|
||||
{
|
||||
private static final POILogger _logger =
|
||||
|
|
|
|||
Loading…
Reference in New Issue