/// <summary>
/// Decodes the binary file data and fills the internal properties
/// </summary>
/// <returns>true if succeeded</returns>
private bool DecodeData()
{
bool bRet = true;
MemoryStream memStream = new MemoryStream(_binaryFileData);
BinaryReader binReader = new BinaryReader(memStream);
int nCurOffset = 0;
while ((memStream.Position < memStream.Length) && (bRet))
{
int entryOffset = nCurOffset;
int tocIdx = binReader.ReadInt32();
int titleOffset = binReader.ReadInt32();
int urltablOffset = binReader.ReadInt32();
int visibilityMode = binReader.ReadInt16();
int unknownMode = binReader.ReadInt16();
TopicEntry newEntry = new TopicEntry(entryOffset, tocIdx, titleOffset, urltablOffset, visibilityMode, unknownMode, _associatedFile);
_topicTable.Add(newEntry);
nCurOffset = (int)memStream.Position;
}
return(bRet);
}
/// <summary>
/// Reads the object data from a dump store
/// </summary>
/// <param name="reader">reader to read the data</param>
internal void ReadDump(ref BinaryReader reader)
{
int i = 0;
int nCnt = reader.ReadInt32();
for (i = 0; i < nCnt; i++)
{
TopicEntry newItem = new TopicEntry();
newItem.SetCHMFile(_associatedFile);
newItem.ReadDump(ref reader);
_topicTable.Add(newItem);
}
}
/// <summary>
/// Decodes the binary file data and fills the internal properties
/// </summary>
/// <returns>true if succeeded</returns>
private bool DecodeData()
{
_toc = new ArrayList();
_offsetTable = new Hashtable();
bool bRet = true;
MemoryStream memStream = new MemoryStream(_binaryFileData);
BinaryReader binReader = new BinaryReader(memStream);
int nCurOffset = 0;
_offset2028 = binReader.ReadInt32();
_offset16structs = binReader.ReadInt32();
_numberOf16structs = binReader.ReadInt32();
_offsetOftopics = binReader.ReadInt32();
binReader.BaseStream.Seek(_offset2028, SeekOrigin.Begin);
if (RecursivelyBuildTree(ref binReader, _offset2028, _toc, null))
{
binReader.BaseStream.Seek(_offset16structs, SeekOrigin.Begin);
nCurOffset = (int)binReader.BaseStream.Position;
for (int i = 0; i < _numberOf16structs; i++)
{
int tocOffset = binReader.ReadInt32();
int sqNr = binReader.ReadInt32();
int topOffset = binReader.ReadInt32();
int hhctopicIdx = binReader.ReadInt32();
nCurOffset = (int)binReader.BaseStream.Position;
int topicIdx = -1;
// if the topic offset is within the range of the stream
// and is >= the offset of the first topic dword
if ((topOffset < (binReader.BaseStream.Length - 4)) && (topOffset >= _offsetOftopics))
{
// read the index of the topic for this item
binReader.BaseStream.Seek(topOffset, SeekOrigin.Begin);
topicIdx = binReader.ReadInt32();
binReader.BaseStream.Seek(nCurOffset, SeekOrigin.Begin);
TOCItem item = (TOCItem)_offsetTable[tocOffset.ToString()];
if (item != null)
{
if ((topicIdx < _associatedFile.TopicsFile.TopicTable.Count) && (topicIdx >= 0))
{
TopicEntry te = (TopicEntry)(_associatedFile.TopicsFile.TopicTable[topicIdx]);
if ((te != null) && (item.TopicOffset < 0))
{
item.TopicOffset = te.EntryOffset;
}
}
}
}
}
}
return(bRet);
}
/// <summary>
/// Recursively reads the binary toc tree from the file
/// </summary>
/// <param name="binReader">reference to binary reader</param>
/// <param name="NodeOffset">offset of the first node in the current level</param>
/// <param name="level">arraylist of TOCItems for the current level</param>
/// <param name="parentItem">parent item for the item</param>
/// <returns>Returns true if succeeded</returns>
private bool RecursivelyBuildTree(ref BinaryReader binReader, int NodeOffset, ArrayList level, TOCItem parentItem)
{
bool bRet = true;
int nextOffset = 0;
int nReadOffset = (int)binReader.BaseStream.Position;
binReader.BaseStream.Seek(NodeOffset, SeekOrigin.Begin);
do
{
int nCurOffset = (int)binReader.BaseStream.Position;
int unkn1 = binReader.ReadInt16(); // unknown
int unkn2 = binReader.ReadInt16(); // unknown
int flag = binReader.ReadInt32();
int nFolderAdd = 0;
if ((_associatedFile != null) && (_associatedFile.ImageTypeFolder))
{
// get the value which should be added, to display folders instead of books
if (HtmlHelpSystem.UseHH2TreePics)
{
nFolderAdd = 8;
}
else
{
nFolderAdd = 4;
}
}
int nFolderImgIdx = (HtmlHelpSystem.UseHH2TreePics ? (TOCItem.STD_FOLDER_HH2 + nFolderAdd) : (TOCItem.STD_FOLDER_HH1 + nFolderAdd));
int nFileImgIdx = (HtmlHelpSystem.UseHH2TreePics ? TOCItem.STD_FILE_HH2 : TOCItem.STD_FILE_HH1);
int stdImage = ((flag & 0x4) != 0) ? nFolderImgIdx : nFileImgIdx;
int stringOffset = binReader.ReadInt32();
int ParentOffset = binReader.ReadInt32();
nextOffset = binReader.ReadInt32();
int firstChildOffset = 0;
int unkn3 = 0;
if ((flag & 0x4) != 0)
{
firstChildOffset = binReader.ReadInt32();
unkn3 = binReader.ReadInt32(); // unknown
}
TOCItem newItem = new TOCItem();
newItem.ImageIndex = stdImage;
newItem.Offset = nCurOffset;
newItem.OffsetNext = nextOffset;
newItem.AssociatedFile = _associatedFile;
newItem.TocMode = DataMode.Binary;
newItem.Parent = parentItem;
if ((flag & 0x08) == 0)
{
// toc item doesn't have a local value (=> stringOffset = offset of strings file)
newItem.Name = _associatedFile.StringsFile[stringOffset];
}
else
{
// this item has a topic entry (=> stringOffset = index of topic entry)
if ((stringOffset < _associatedFile.TopicsFile.TopicTable.Count) && (stringOffset >= 0))
{
TopicEntry te = (TopicEntry)(_associatedFile.TopicsFile.TopicTable[stringOffset]);
if (te != null)
{
newItem.TopicOffset = te.EntryOffset;
}
}
}
_offsetTable[nCurOffset.ToString()] = newItem;
// if this item has children (firstChildOffset > 0)
if (firstChildOffset > 0)
{
bRet &= RecursivelyBuildTree(ref binReader, firstChildOffset, newItem.Children, newItem);
}
level.Add(newItem);
if (nCurOffset != nextOffset)
{
binReader.BaseStream.Seek(nextOffset, SeekOrigin.Begin);
}
}while(nextOffset != 0);
binReader.BaseStream.Seek(nReadOffset, SeekOrigin.Begin);
return(bRet);
}