private void ReadHeader()
{
this.binaryReader = new BinaryReader(this.BaseStream);
// Skip the first 100 bytes. Signature, perhaps?
this._signature = this.binaryReader.ReadBytes(100);
this.filecount = CmfHelper.Decode(binaryReader.ReadUInt32(), CmfFormat.EntryKey1);
this.headeroffsetStart = this.BaseStream.Position;
this.dataoffsetStart = this.BaseStream.Position + (CmfFormat.FileHeaderSize * this.filecount);
}
public bool MoveNext()
{
if (this.currentCount < this.sourceArchive.FileCount)
{
if (this.myEntry == null)
{
this.myEntry = new CMFEntry();
}
this.sourceArchive.BaseStream.Seek(this.currentPos, SeekOrigin.Begin);
int readcount = this.br.Read(this.buffer, 0, this.buffer.Length);
if (readcount == this.buffer.Length)
{
this.myEntry.headeroffset = (int)this.currentPos;
// Decode the buffer.
CmfHelper.Decode(ref this.buffer);
// First 512 bytes is the filename
string tmp_filename = Encoding.ASCII.GetString(this.buffer, 0, CmfFormat.FileHeaderNameSize);
// This doesn't look good.
int indexofNull = tmp_filename.IndexOf("\0\0");
if (tmp_filename.IndexOf("\0\0") == -1)
{
indexofNull = tmp_filename.LastIndexOf('\0');
tmp_filename = Encoding.ASCII.GetString(this.buffer, 0, indexofNull);
}
else
{
this.myEntry._filename = Encoding.Unicode.GetString(this.buffer, 0, indexofNull + 1);
}
this.myEntry._filename = this.myEntry._filename.RemoveNullChar();
// Next is 4 bytes for the unpacked size (aka original file)
this.myEntry._unpackedsize = BitConverter.ToInt32(this.buffer, 512);
// Next is another 4 bytes for compressedsize
this.myEntry._compressedsize = BitConverter.ToInt32(this.buffer, 516);
// Next is another 4 bytes for "DataOffset"
this.myEntry.dataoffset = BitConverter.ToInt32(this.buffer, 520);
// if (str == "FX" || str == "LUA" || str == "TET" || str == "XET")
// Last is the flag, determine if the file is compressed (with Zlib) or encrypted or nothing special.
switch (BitConverter.ToInt32(this.buffer, 524))
{
case 1:
this.myEntry._iscompressed = true;
break;
case 2:
this.myEntry._isencrypted = true;
break;
}
}
this.currentPos += readcount;
return(true);
}
else
{
return(false);
}
}
private ReadOnlyCollection <CMFEntry> ReadEntryList()
{
this.BaseStream.Seek(this.headeroffsetStart, SeekOrigin.Begin);
/*
* File table has fixed row size 528 bytes.
* string(512):Filename - int(4):FileSize - int(4):CompressedFileSize - int(4):FileOffset - int(4):Flag
*/
// CmfFormat.FileHeaderSize
CMFEntry[] entryList = new CMFEntry[this.filecount];
string tmp_filename;
byte[] bytebuffer = new byte[CmfFormat.FileHeaderSize];
int readcount, indexofNull;
int offset = (int)this.BaseStream.Position;
CMFEntry currentCMFEntry;
for (int i = 0; i < entryList.Length; i++)
{
tmp_filename = null;
currentCMFEntry = new CMFEntry();
readcount = this.binaryReader.Read(bytebuffer, 0, bytebuffer.Length);
if (readcount == bytebuffer.Length)
{
currentCMFEntry.headeroffset = offset;
// Decode the buffer.
CmfHelper.Decode(ref bytebuffer);
// First 512 bytes is the filename
tmp_filename = Encoding.ASCII.GetString(bytebuffer, 0, CmfFormat.FileHeaderNameSize);
// This doesn't look good.
indexofNull = tmp_filename.IndexOf("\0\0");
if (tmp_filename.IndexOf("\0\0") == -1)
{
indexofNull = tmp_filename.LastIndexOf('\0');
tmp_filename = Encoding.ASCII.GetString(bytebuffer, 0, indexofNull);
}
else
{
currentCMFEntry._filename = Encoding.Unicode.GetString(bytebuffer, 0, indexofNull + 1);
}
currentCMFEntry._filename = currentCMFEntry._filename.RemoveNullChar();
// Next is 4 bytes for the unpacked size (aka original file)
currentCMFEntry._unpackedsize = BitConverter.ToInt32(bytebuffer, 512);
// Next is another 4 bytes for compressedsize
currentCMFEntry._compressedsize = BitConverter.ToInt32(bytebuffer, 516);
// Next is another 4 bytes for "DataOffset"
currentCMFEntry.dataoffset = BitConverter.ToInt32(bytebuffer, 520);
// if (str == "FX" || str == "LUA" || str == "TET" || str == "XET")
// Last is the flag, determine if the file is compressed (with Zlib) or encrypted or nothing special.
switch (BitConverter.ToInt32(bytebuffer, 524))
{
case 1:
currentCMFEntry._iscompressed = true;
break;
case 2:
currentCMFEntry._isencrypted = true;
break;
}
entryList[i] = currentCMFEntry;
}
offset += readcount;
}
return(new ReadOnlyCollection <CMFEntry>(entryList));
}
