public override ArcFile TryOpen(ArcView file)
{
var header = file.View.ReadBytes (0, 0x5C);
if (header.Length != 0x5C)
return null;
header = HeaderEncryption.Decrypt (header);
if (!Binary.AsciiEqual (header, "GLibArchiveData2.") || header[0x12] != 0)
return null;
int version = header[0x11] - '0';
if (version != 0 && version != 1)
return null;
uint index_offset = LittleEndian.ToUInt32 (header, 0x54);
uint index_size = LittleEndian.ToUInt32 (header, 0x58);
byte[][] encrypted_index = new byte[2][];
encrypted_index[0] = file.View.ReadBytes (index_offset, index_size);
if (encrypted_index[0].Length != index_size)
return null;
encrypted_index[1] = new byte[index_size];
uint[] keys = {
LittleEndian.ToUInt32 (header, 0x44),
LittleEndian.ToUInt32 (header, 0x34),
LittleEndian.ToUInt32 (header, 0x24),
LittleEndian.ToUInt32 (header, 0x14),
};
int i = 0;
foreach (var key in keys)
{
var decoder = G2MetaScheme.CreateInstance (key);
decoder.Decrypt (encrypted_index[i], encrypted_index[i^1]);
i ^= 1;
}
byte[] index = encrypted_index[i];
if (!Binary.AsciiEqual (index, "CDBD"))
return null;
int count = LittleEndian.ToInt32 (index, 4);
int current_offset = 0x10;
int info_base = current_offset + LittleEndian.ToInt32 (index, 8);
int names_base = current_offset + count * 0x18;
var dir = new List<Entry> (count);
for (i = 0; i < count; ++i)
{
int name_offset = names_base + LittleEndian.ToInt32 (index, current_offset);
int parent_dir = LittleEndian.ToInt32 (index, current_offset+8);
int attr = LittleEndian.ToInt32 (index, current_offset+0xC);
var name = Binary.GetCString (index, name_offset, info_base-name_offset);
if (parent_dir != -1)
name = Path.Combine (dir[parent_dir].Name, name);
var entry = new G2Entry { Name = name };
if (0x100 == attr)
{
int info_offset = info_base + LittleEndian.ToInt32 (index, current_offset+0x10);
entry.Size = LittleEndian.ToUInt32 (index, info_offset+8);
entry.Offset = LittleEndian.ToUInt32 (index, info_offset+0xC);
entry.Type = FormatCatalog.Instance.GetTypeFromName (name);
for (int j = 0; j < 4; ++j)
{
info_offset += 0x10;
entry.Keys[j] = LittleEndian.ToUInt32 (index, info_offset);
}
}
dir.Add (entry);
current_offset += 0x18;
}
return new ArcFile (file, this, dir.Where (e => e.Offset != -1).ToList());
}
public override ArcFile TryOpen(ArcView file)
{
var header = file.View.ReadBytes(0, 0x5C);
if (header.Length != 0x5C)
{
return(null);
}
header = HeaderEncryption.Decrypt(header);
if (!Binary.AsciiEqual(header, "GLibArchiveData2.") || header[0x12] != 0)
{
return(null);
}
int version = header[0x11] - '0';
if (version != 0 && version != 1)
{
return(null);
}
uint index_offset = LittleEndian.ToUInt32(header, 0x54);
uint index_size = LittleEndian.ToUInt32(header, 0x58);
byte[][] encrypted_index = new byte[2][];
encrypted_index[0] = file.View.ReadBytes(index_offset, index_size);
if (encrypted_index[0].Length != index_size)
{
return(null);
}
encrypted_index[1] = new byte[index_size];
uint[] keys =
{
LittleEndian.ToUInt32(header, 0x44),
LittleEndian.ToUInt32(header, 0x34),
LittleEndian.ToUInt32(header, 0x24),
LittleEndian.ToUInt32(header, 0x14),
};
int i = 0;
foreach (var key in keys)
{
var decoder = G2MetaScheme.CreateInstance(key);
decoder.Decrypt(encrypted_index[i], encrypted_index[i ^ 1]);
i ^= 1;
}
byte[] index = encrypted_index[i];
if (!Binary.AsciiEqual(index, "CDBD"))
{
return(null);
}
int count = LittleEndian.ToInt32(index, 4);
int current_offset = 0x10;
int info_base = current_offset + LittleEndian.ToInt32(index, 8);
int names_base = current_offset + count * 0x18;
var dir = new List <Entry> (count);
for (i = 0; i < count; ++i)
{
int name_offset = names_base + LittleEndian.ToInt32(index, current_offset);
int parent_dir = LittleEndian.ToInt32(index, current_offset + 8);
int attr = LittleEndian.ToInt32(index, current_offset + 0xC);
var name = Binary.GetCString(index, name_offset, info_base - name_offset);
if (parent_dir != -1)
{
name = Path.Combine(dir[parent_dir].Name, name);
}
var entry = new G2Entry {
Name = name
};
if (0x100 == attr)
{
int info_offset = info_base + LittleEndian.ToInt32(index, current_offset + 0x10);
entry.Size = LittleEndian.ToUInt32(index, info_offset + 8);
entry.Offset = LittleEndian.ToUInt32(index, info_offset + 0xC);
entry.Type = FormatCatalog.Instance.GetTypeFromName(name);
for (int j = 0; j < 4; ++j)
{
info_offset += 0x10;
entry.Keys[j] = LittleEndian.ToUInt32(index, info_offset);
}
}
dir.Add(entry);
current_offset += 0x18;
}
return(new ArcFile(file, this, dir.Where(e => e.Offset != -1).ToList()));
}
