public byte[] ExtractResource(TAHEntry entry)
{
//data読み込み長さ
//-4はdata書き出し長さ格納領域 (UInt32) を減じている
UInt32 input_length = entry.length - 4;
//data読み込みバッファ
byte[] data_input = new byte[input_length];
UInt32 output_length;
reader.BaseStream.Position = entry.offset;
//data書き出し長さ
output_length = reader.ReadUInt32();
data_input = reader.ReadBytes((int)input_length);
//-- data読み込み（復号前）完了! --
//data書き出しバッファ
byte[] data_output = new byte[output_length];
TAHCryption.crypt(ref data_input, input_length, output_length);
Decompression.infrate(ref data_input, input_length, ref data_output, output_length);
//-- data復号完了! --
return(data_output);
}
// modified:
// (c)2002 Jonathan Bennett ([email protected])
/*LZSS compressor*/
public static void encrypt(ref byte[] data_input, UInt32 input_length, ref byte[] data_output, ref UInt32 output_length)
{
// Set up initial values
UInt32 m_nDataStreamPos = 0; // We are at the start of the input data
UInt32 m_nCompressedStreamPos = 0; // We are at the start of the compressed data
HS_LZSS_OUTPUT_BUFFER = 0;
HS_LZSS_OUTPUT_BUFFER_POS = 0;
data_output = new byte[1024 * 1024]; //1MB buffer
// If the input file is too small then there is a chance of
// buffer overrun, so just abort
if (input_length < 32)
{
data_output = data_input;
return;
}
// Initialize our hash table
HashTableInit();
//
// Jump to our main compression function
//
deflate_loop(ref data_input, input_length, ref data_output, ref output_length, ref m_nDataStreamPos, ref m_nCompressedStreamPos);
TAHCryption.crypt(ref data_output, output_length, input_length);
}
/* TAH Procedures*/
public void extract_TAH_directory()
{
Entries = null;
UInt32 arc_size = (UInt32)reader.BaseStream.Length;
byte[] magic = reader.ReadBytes(4);
if (magic[0] != (byte)'T' || magic[1] != (byte)'A' || magic[2] != (byte)'H' || magic[3] != (byte)'2')
{
throw new Exception("File is not TAH");
}
Header tah_header;
tah_header.index_entry_count = reader.ReadUInt32();
tah_header.version = reader.ReadUInt32();
tah_header.reserved = reader.ReadUInt32();
UInt32 index_buffer_size = tah_header.index_entry_count * 8; //sizeof(index_entry) == 8
Entries = new TAHEntry[tah_header.index_entry_count];
for (int i = 0; i < tah_header.index_entry_count; i++)
{
Entries[i] = new TAHEntry();
Entries[i].hash_code = reader.ReadUInt32();
Entries[i].offset = reader.ReadUInt32();
}
UInt32 output_length = reader.ReadUInt32();
//entry情報の読み出し長さ
UInt32 input_length = Entries[0].offset - /*sizeof(Header)*/ 16 - index_buffer_size;
//entry情報の読み出しバッファ
byte[] data_input = new byte[input_length];
data_input = reader.ReadBytes((int)input_length);
//-- entry情報の読み込み完了! --
byte[] output_data = new byte[output_length];
TAHCryption.crypt(ref data_input, input_length, output_length);
Decompression.infrate(ref data_input, input_length, ref output_data, output_length);
//-- entry情報の復号完了! --
build_TAHEntries(output_data, arc_size);
}
public static void decrypt(ref byte[] data_input, UInt32 input_length, ref byte[] data_output, UInt32 output_length)
{
TAHCryption.crypt(ref data_input, input_length, output_length);
infrate(ref data_input, input_length, ref data_output, output_length);
}
