protected IndexReader(DxHeader header, int version, Stream input)
{
m_header = header;
m_version = version;
m_input = new BinaryStream(input, "");
m_encoding = Encoding.GetEncoding(header.CodePage);
}
public IndexReader(DxHeader header, int version, Stream input)
{
m_version = version;
m_entry_size = m_version >= 2 ? 0x2C : 0x28;
m_header = header;
m_input = new ArcView.Reader(input);
}
List <Entry> ReadIndex(ArcView file, int version, byte[] key)
{
var header = file.View.ReadBytes(4, 0x18);
if (0x18 != header.Length)
{
return(null);
}
Decrypt(header, 0, header.Length, 4, key);
var dx = new DxHeader {
IndexSize = LittleEndian.ToUInt32(header, 0),
BaseOffset = LittleEndian.ToUInt32(header, 4),
IndexOffset = LittleEndian.ToUInt32(header, 8),
FileTable = LittleEndian.ToUInt32(header, 0x0c),
DirTable = LittleEndian.ToUInt32(header, 0x10),
};
if (dx.DirTable >= dx.IndexSize || dx.FileTable >= dx.IndexSize)
{
return(null);
}
using (var encrypted = file.CreateStream(dx.IndexOffset, dx.IndexSize))
using (var index = new EncryptedStream(encrypted, dx.IndexOffset, key))
using (var reader = new IndexReader(dx, version, index))
{
return(reader.Read());
}
}
public static IndexReader Create(DxHeader header, int version, Stream input)
{
if (version <= 4)
{
return(new IndexReaderV2(header, version, input));
}
else if (6 == version)
{
return(new IndexReaderV6(header, version, input));
}
else
{
throw new InvalidFormatException("Not supported DX archive version.");
}
}
List <Entry> ReadIndex(ArcView file, int version, byte[] key)
{
DxHeader dx = null;
if (version <= 4)
{
dx = ReadArcHeaderV4(file, version, key);
}
else if (6 == version)
{
dx = ReadArcHeaderV6(file, version, key);
}
if (null == dx || dx.DirTable >= dx.IndexSize || dx.FileTable >= dx.IndexSize)
{
return(null);
}
using (var encrypted = file.CreateStream(dx.IndexOffset, dx.IndexSize))
using (var index = new EncryptedStream(encrypted, 6 == version ? 0 : dx.IndexOffset, key))
using (var reader = IndexReader.Create(dx, version, index))
{
return(reader.Read());
}
}
public IndexReaderV6(DxHeader header, int version, Stream input) : base(header, version, input)
{
m_entry_size = 0x40;
}
public IndexReaderV2(DxHeader header, int version, Stream input) : base(header, version, input)
{
m_entry_size = m_version >= 2 ? 0x2C : 0x28;
}
public IndexReader(DxHeader header, int version, Stream input)
{
m_version = version;
m_entry_size = m_version >= 2 ? 0x2C : 0x28;
m_header = header;
m_input = new ArcView.Reader (input);
}
List<Entry> ReadIndex(ArcView file, int version, byte[] key)
{
var header = file.View.ReadBytes (4, 0x18);
if (0x18 != header.Length)
return null;
Decrypt (header, 0, header.Length, 4, key);
var dx = new DxHeader {
IndexSize = LittleEndian.ToUInt32 (header, 0),
BaseOffset = LittleEndian.ToUInt32 (header, 4),
IndexOffset = LittleEndian.ToUInt32 (header, 8),
FileTable = LittleEndian.ToUInt32 (header, 0x0c),
DirTable = LittleEndian.ToUInt32 (header, 0x10),
};
if (dx.DirTable >= dx.IndexSize || dx.FileTable >= dx.IndexSize)
return null;
using (var encrypted = file.CreateStream (dx.IndexOffset, dx.IndexSize))
using (var index = new EncryptedStream (encrypted, dx.IndexOffset, key))
using (var reader = new IndexReader (dx, version, index))
{
return reader.Read();
}
}
