public List <Entry> ReadIndex()
{
using (var index = OpenIndex())
{
int name_size = m_record_size - 0x10;
var dir = new List <Entry> (m_count);
for (int i = 0; i < m_count; ++i)
{
var entry = new AgsiEntry();
entry.UnpackedSize = index.ReadUInt32();
entry.Size = index.ReadUInt32();
entry.Method = index.ReadInt32();
entry.Offset = index.ReadUInt32() + m_data_offset;
if (!entry.CheckPlacement(m_file.MaxOffset))
{
return(null);
}
var name = index.ReadCString(name_size);
if (string.IsNullOrEmpty(name))
{
return(null);
}
entry.Name = name;
entry.Type = FormatCatalog.Instance.GetTypeFromName(name);
entry.IsPacked = entry.Method != 0 && entry.Method != 3;
entry.IsSpecial = name.Equals("Copyright.Dat", StringComparison.OrdinalIgnoreCase);
dir.Add(entry);
}
return(dir);
}
}
internal Stream OpenEncryptedEntry(AgsiArchive arc, AgsiEntry entry)
{
uint enc_size = entry.Size;
if (enc_size > 1024)
{
enc_size = 1032;
}
using (var des = DES.Create())
{
des.Key = arc.Key;
des.Mode = CipherMode.ECB;
des.Padding = PaddingMode.Zeros;
using (var enc = arc.File.CreateStream(entry.Offset, enc_size))
using (var dec = new InputCryptoStream(enc, des.CreateDecryptor()))
{
var output = new byte[enc_size];
dec.Read(output, 0, output.Length);
int header_size;
if (!entry.IsSpecial)
{
header_size = output.ToInt32(output.Length - 4);
if (header_size > entry.UnpackedSize)
{
throw new InvalidEncryptionScheme();
}
}
else
{
header_size = (int)entry.UnpackedSize;
}
if (!entry.IsSpecial && entry.Size > enc_size)
{
var header = new byte[header_size];
Buffer.BlockCopy(output, 0, header, 0, header_size);
var input = arc.File.CreateStream(entry.Offset + enc_size, entry.Size - enc_size);
return(new PrefixStream(header, input));
}
else
{
return(new BinMemoryStream(output, 0, header_size, entry.Name));
}
}
}
}
