public override ArcFile TryOpen(ArcView file)
{
int count = file.View.ReadInt32(12);
if (!IsSaneCount(count))
{
return(null);
}
int key1index = file.View.ReadUInt16(4);
int key2index = file.View.ReadUInt16(6);
if (key2index != 0 && key1index == 0)
{
return(null);
}
uint index_size = file.View.ReadUInt32(8) - 0x10;
if (index_size < 0x40 || index_size >= file.MaxOffset)
{
return(null);
}
var index = new byte[index_size];
if (index.Length != file.View.Read(0x10, index, 0, index_size))
{
return(null);
}
/*
* var key_src = KnownKey;
* if (key1index >= key_src.Item1.Length || key2index >= key_src.Item2.Length)
* return null;
* byte index_key = (byte)(key_src.Item1[key1index] + key_src.Item2[key2index]);
*/
var key = GuessKey(file, index);
if (null == key)
{
throw new UnknownEncryptionScheme();
}
Decrypt(index, 0, index.Length, key.Value);
int current_offset = 0;
uint next_offset = LittleEndian.ToUInt32(index, current_offset + 0x1C);
var dir = new List <Entry> (count);
for (int i = 0; i < count; ++i)
{
string name = Binary.GetCString(index, current_offset, 0x0E);
var entry = new MrgEntry
{
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName(name),
Offset = next_offset,
Method = index[current_offset + 0x12],
};
next_offset = LittleEndian.ToUInt32(index, current_offset + 0x3C);
entry.Size = next_offset - (uint)entry.Offset;
if (entry.Offset < index_size || !entry.CheckPlacement(file.MaxOffset))
{
return(null);
}
entry.IsPacked = entry.Method != 0;
entry.UnpackedSize = LittleEndian.ToUInt32(index, current_offset + 0x0E);
dir.Add(entry);
current_offset += 0x20;
}
return(new ArcFile(file, this, dir));
}
public override ArcFile TryOpen(ArcView file)
{
int count = file.View.ReadInt32 (12);
if (!IsSaneCount (count))
return null;
int key1index = file.View.ReadUInt16 (4);
int key2index = file.View.ReadUInt16 (6);
if (key2index != 0 && key1index == 0)
return null;
uint index_size = file.View.ReadUInt32 (8) - 0x10;
if (index_size < 0x40 || index_size >= file.MaxOffset)
return null;
var index = new byte[index_size];
if (index.Length != file.View.Read (0x10, index, 0, index_size))
return null;
/*
var key_src = KnownKey;
if (key1index >= key_src.Item1.Length || key2index >= key_src.Item2.Length)
return null;
byte index_key = (byte)(key_src.Item1[key1index] + key_src.Item2[key2index]);
*/
var key = GuessKey (file, index);
if (null == key)
throw new UnknownEncryptionScheme();
Decrypt (index, 0, index.Length, key.Value);
int current_offset = 0;
uint next_offset = LittleEndian.ToUInt32 (index, current_offset+0x1C);
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
string name = Binary.GetCString (index, current_offset, 0x0E);
var entry = new MrgEntry
{
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName (name),
Offset = next_offset,
Method = index[current_offset+0x12],
};
next_offset = LittleEndian.ToUInt32 (index, current_offset+0x3C);
entry.Size = next_offset - (uint)entry.Offset;
if (entry.Offset < index_size || !entry.CheckPlacement (file.MaxOffset))
return null;
entry.IsPacked = entry.Method != 0;
entry.UnpackedSize = LittleEndian.ToUInt32 (index, current_offset+0x0E);
dir.Add (entry);
current_offset += 0x20;
}
return new ArcFile (file, this, dir);
}