mirror of
https://github.com/reactos/reactos.git
synced 2024-12-29 10:35:28 +00:00
288 lines
8.7 KiB
C#
288 lines
8.7 KiB
C#
using System;
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using System.IO;
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using System.Collections;
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namespace HtmlHelp.ChmDecoding
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{
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/// <summary>
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/// The class <c>CHMTocidx</c> implements functions to decode the #TOCIDX internal file.
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/// </summary>
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internal sealed class CHMTocidx : IDisposable
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{
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/// <summary>
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/// Constant specifying the size of the data blocks
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/// </summary>
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private const int BLOCK_SIZE = 0x1000;
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/// <summary>
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/// Internal flag specifying if the object is going to be disposed
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/// </summary>
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private bool disposed = false;
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/// <summary>
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/// Internal member storing the binary file data
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/// </summary>
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private byte[] _binaryFileData = null;
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/// <summary>
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/// Internal memebr storing the offset to the 20/28 byte structs
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/// </summary>
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private int _offset2028 = 0;
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/// <summary>
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/// Internal member storing the offset to the 16 byte structs
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/// </summary>
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private int _offset16structs = 0;
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/// <summary>
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/// Internal member storing the number of 16 byte structs
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/// </summary>
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private int _numberOf16structs = 0;
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/// <summary>
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/// Internal member storing the offset to the topic list
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/// </summary>
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private int _offsetOftopics = 0;
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/// <summary>
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/// Internal member storing the toc
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/// </summary>
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private ArrayList _toc = new ArrayList();
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/// <summary>
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/// Internal member for offset seeking
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/// </summary>
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private Hashtable _offsetTable = new Hashtable();
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/// <summary>
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/// Internal member storing the associated chmfile object
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/// </summary>
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private CHMFile _associatedFile = null;
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/// <summary>
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/// Constructor of the class
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/// </summary>
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/// <param name="binaryFileData">binary file data of the #TOCIDX file</param>
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/// <param name="associatedFile">associated chm file</param>
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public CHMTocidx(byte[] binaryFileData, CHMFile associatedFile)
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{
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_binaryFileData = binaryFileData;
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_associatedFile = associatedFile;
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DecodeData();
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// clear internal binary data after extraction
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_binaryFileData = null;
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}
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/// <summary>
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/// Decodes the binary file data and fills the internal properties
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/// </summary>
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/// <returns>true if succeeded</returns>
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private bool DecodeData()
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{
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_toc = new ArrayList();
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_offsetTable = new Hashtable();
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bool bRet = true;
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MemoryStream memStream = new MemoryStream(_binaryFileData);
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BinaryReader binReader = new BinaryReader(memStream);
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int nCurOffset = 0;
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_offset2028 = binReader.ReadInt32();
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_offset16structs = binReader.ReadInt32();
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_numberOf16structs = binReader.ReadInt32();
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_offsetOftopics = binReader.ReadInt32();
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binReader.BaseStream.Seek( _offset2028, SeekOrigin.Begin );
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if( RecursivelyBuildTree(ref binReader, _offset2028, _toc, null) )
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{
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binReader.BaseStream.Seek( _offset16structs, SeekOrigin.Begin );
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nCurOffset = (int)binReader.BaseStream.Position;
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for(int i=0; i < _numberOf16structs; i++)
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{
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int tocOffset = binReader.ReadInt32();
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int sqNr = binReader.ReadInt32();
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int topOffset = binReader.ReadInt32();
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int hhctopicIdx = binReader.ReadInt32();
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nCurOffset = (int)binReader.BaseStream.Position;
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int topicIdx = -1;
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// if the topic offset is within the range of the stream
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// and is >= the offset of the first topic dword
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if((topOffset < (binReader.BaseStream.Length - 4)) && (topOffset >= _offsetOftopics))
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{
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// read the index of the topic for this item
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binReader.BaseStream.Seek( topOffset, SeekOrigin.Begin);
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topicIdx = binReader.ReadInt32();
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binReader.BaseStream.Seek( nCurOffset, SeekOrigin.Begin);
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TOCItem item = (TOCItem)_offsetTable[tocOffset.ToString()];
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if( item != null)
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{
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if(( topicIdx < _associatedFile.TopicsFile.TopicTable.Count)&&(topicIdx>=0))
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{
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TopicEntry te = (TopicEntry) (_associatedFile.TopicsFile.TopicTable[topicIdx]);
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if( (te != null) && (item.TopicOffset < 0) )
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{
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item.TopicOffset = te.EntryOffset;
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}
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}
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}
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}
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}
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}
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return bRet;
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}
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/// <summary>
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/// Recursively reads the binary toc tree from the file
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/// </summary>
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/// <param name="binReader">reference to binary reader</param>
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/// <param name="NodeOffset">offset of the first node in the current level</param>
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/// <param name="level">arraylist of TOCItems for the current level</param>
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/// <param name="parentItem">parent item for the item</param>
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/// <returns>Returns true if succeeded</returns>
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private bool RecursivelyBuildTree(ref BinaryReader binReader, int NodeOffset, ArrayList level, TOCItem parentItem)
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{
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bool bRet = true;
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int nextOffset=0;
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int nReadOffset = (int)binReader.BaseStream.Position;
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binReader.BaseStream.Seek(NodeOffset, SeekOrigin.Begin);
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do
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{
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int nCurOffset = (int)binReader.BaseStream.Position;
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int unkn1 = binReader.ReadInt16(); // unknown
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int unkn2 = binReader.ReadInt16(); // unknown
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int flag = binReader.ReadInt32();
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int nFolderAdd = 0;
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if((_associatedFile != null) && (_associatedFile.ImageTypeFolder))
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{
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// get the value which should be added, to display folders instead of books
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if(HtmlHelpSystem.UseHH2TreePics)
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nFolderAdd = 8;
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else
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nFolderAdd = 4;
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}
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int nFolderImgIdx = (HtmlHelpSystem.UseHH2TreePics ? (TOCItem.STD_FOLDER_HH2+nFolderAdd) : (TOCItem.STD_FOLDER_HH1+nFolderAdd));
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int nFileImgIdx = (HtmlHelpSystem.UseHH2TreePics ? TOCItem.STD_FILE_HH2 : TOCItem.STD_FILE_HH1);
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int stdImage = ((flag & 0x4)!=0) ? nFolderImgIdx : nFileImgIdx;
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int stringOffset = binReader.ReadInt32();
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int ParentOffset = binReader.ReadInt32();
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nextOffset = binReader.ReadInt32();
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int firstChildOffset = 0;
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int unkn3=0;
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if( (flag&0x4)!=0 )
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{
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firstChildOffset = binReader.ReadInt32();
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unkn3 = binReader.ReadInt32(); // unknown
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}
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TOCItem newItem = new TOCItem();
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newItem.ImageIndex = stdImage;
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newItem.Offset = nCurOffset;
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newItem.OffsetNext = nextOffset;
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newItem.AssociatedFile = _associatedFile;
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newItem.TocMode = DataMode.Binary;
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newItem.Parent = parentItem;
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if( (flag&0x08) == 0)
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{
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// toc item doesn't have a local value (=> stringOffset = offset of strings file)
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newItem.Name = _associatedFile.StringsFile[stringOffset];
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}
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else
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{
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// this item has a topic entry (=> stringOffset = index of topic entry)
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if((stringOffset < _associatedFile.TopicsFile.TopicTable.Count) && (stringOffset >= 0))
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{
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TopicEntry te = (TopicEntry) (_associatedFile.TopicsFile.TopicTable[stringOffset]);
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if(te != null)
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{
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newItem.TopicOffset = te.EntryOffset;
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}
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}
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}
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_offsetTable[nCurOffset.ToString()] = newItem;
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// if this item has children (firstChildOffset > 0)
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if( firstChildOffset > 0)
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{
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bRet &= RecursivelyBuildTree(ref binReader, firstChildOffset, newItem.Children, newItem);
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}
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level.Add( newItem );
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if(nCurOffset != nextOffset)
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binReader.BaseStream.Seek(nextOffset, SeekOrigin.Begin);
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}while(nextOffset != 0);
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binReader.BaseStream.Seek(nReadOffset, SeekOrigin.Begin);
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return bRet;
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}
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/// <summary>
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/// Gets the internal read toc
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/// </summary>
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internal ArrayList TOC
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{
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get { return _toc; }
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}
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/// <summary>
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/// Implement IDisposable.
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/// </summary>
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public void Dispose()
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{
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Dispose(true);
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// This object will be cleaned up by the Dispose method.
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// Therefore, you should call GC.SupressFinalize to
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// take this object off the finalization queue
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// and prevent finalization code for this object
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// from executing a second time.
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GC.SuppressFinalize(this);
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}
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/// <summary>
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/// Dispose(bool disposing) executes in two distinct scenarios.
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/// If disposing equals true, the method has been called directly
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/// or indirectly by a user's code. Managed and unmanaged resources
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/// can be disposed.
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/// If disposing equals false, the method has been called by the
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/// runtime from inside the finalizer and you should not reference
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/// other objects. Only unmanaged resources can be disposed.
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/// </summary>
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/// <param name="disposing">disposing flag</param>
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private void Dispose(bool disposing)
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{
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// Check to see if Dispose has already been called.
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if(!this.disposed)
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{
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// If disposing equals true, dispose all managed
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// and unmanaged resources.
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if(disposing)
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{
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// Dispose managed resources.
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_binaryFileData = null;
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_toc = null;
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_offsetTable = null;
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}
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}
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disposed = true;
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}
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}
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}
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