public DscDecoder(ArcView.Frame input)
: base(new ArcViewStream(input, input.Offset + 0x20, input.Reserved - 0x20))
{
m_magic = (uint)input.ReadUInt16(input.Offset) << 16;
m_key = input.ReadUInt32(input.Offset + 0x10);
m_dst_size = input.ReadUInt32(input.Offset + 0x14);
m_dec_count = input.ReadUInt32(input.Offset + 0x18);
m_output = new byte[m_dst_size];
}
public bool ReadIndex(string root, long base_offset, uint size)
{
uint signature = m_view.ReadUInt32(base_offset);
if (0x0042494C != signature)
{
return(false);
}
int count = m_view.ReadInt16(base_offset + 8);
if (count <= 0)
{
return(false);
}
long index_offset = base_offset + 0x10;
uint index_size = (uint)(0x30 * count);
if (index_size > size)
{
return(false);
}
if (index_size > m_view.Reserve(index_offset, index_size))
{
return(false);
}
long data_offset = index_offset + index_size;
if (m_dir.Capacity < m_dir.Count + count)
{
m_dir.Capacity = m_dir.Count + count;
}
for (int i = 0; i < count; ++i)
{
string name = m_view.ReadString(index_offset, 0x24);
uint entry_size = m_view.ReadUInt32(index_offset + 0x24);
long offset = base_offset + m_view.ReadUInt32(index_offset + 0x28);
index_offset += 0x30;
string ext = Path.GetExtension(name);
name = Path.Combine(root, name);
if (string.IsNullOrEmpty(ext) && ReadIndex(name, offset, entry_size))
{
continue;
}
if (offset < data_offset || offset + entry_size > base_offset + size)
{
return(false);
}
var entry = FormatCatalog.Instance.Create <Entry> (name);
entry.Offset = offset;
entry.Size = entry_size;
m_dir.Add(entry);
}
return(true);
}
static byte[] ReadBlock(ArcView.Frame view, INekoFormat enc, long offset, out int length)
{
uint hash = view.ReadUInt32(offset);
length = view.ReadInt32(offset + 4);
int aligned_size = (length + 7) & ~7;
byte[] buffer = new byte[aligned_size];
length = view.Read(offset + 8, buffer, 0, (uint)length);
if (0 != hash)
{
enc.Decrypt(hash, buffer, 0, aligned_size);
}
return(buffer);
}
static byte[] ReadBlock(ArcView.Frame view, INekoEncryption enc, long offset, out int length)
{
uint hash = view.ReadUInt32(offset);
length = view.ReadInt32(offset + 4);
// parity check
// if (CalcParity (((NekoEncryption32bit)enc).Parity, (uint)length) != hash)
// throw new InvalidFormatException();
int aligned_size = (length + 7) & ~7;
byte[] buffer = new byte[aligned_size];
length = view.Read(offset + 8, buffer, 0, (uint)length);
if (0 != hash)
{
enc.Decrypt(hash, buffer, 0, aligned_size);
}
return(buffer);
}