private Stream OpenV3Entry(ArcFile arc, PakEntry entry)
{
uint enc_size = Math.Min(entry.Size, 0x10u);
if (0 == enc_size)
{
return(Stream.Null);
}
var buf = arc.File.View.ReadBytes(entry.Offset, enc_size);
uint key = entry.Key;
for (int i = 0; i < buf.Length; ++i)
{
buf[i] ^= (byte)key;
key = Binary.RotR(key, 8);
}
if (enc_size == entry.Size)
{
return(new BinMemoryStream(buf, entry.Name));
}
return(new PrefixStream(buf, arc.File.CreateStream(entry.Offset + enc_size, entry.Size - enc_size)));
}
private List <Entry> OpenPakV3(ArcView file)
{
if (0x110 > file.View.Reserve(4, 0x110))
{
return(null);
}
uint size_xor = file.View.ReadUInt32(0x104);
if (0x64 != size_xor)
{
return(null);
}
byte[] name_buf = file.View.ReadBytes(4, 0x100);
int name_len = 0;
for (int i = 0; i < name_buf.Length; ++i)
{
if (0 == name_buf[i])
{
break;
}
if (name_buf[i] >= 0x80 || name_buf[i] < 0x20)
{
return(null);
}
++name_len;
}
if (0 == name_len || name_len > 0x10)
{
return(null);
}
uint header_key = GetKey(name_buf, name_len);
uint unpacked = file.View.ReadUInt32(0x108) ^ header_key;
int count = (int)(file.View.ReadUInt32(0x10c) ^ header_key);
if (!IsSaneCount(count))
{
return(null);
}
var dir = new List <Entry> (count);
uint header_size = file.View.ReadUInt32(0x110) ^ size_xor;
long base_offset = 0x114 + header_size;
var input = file.CreateStream(0x114, header_size);
using (var header_stream = new ZLibStream(input, CompressionMode.Decompress))
using (var header = new BinaryReader(header_stream, Encoding.ASCII, true))
{
for (int i = 0; i < count; ++i)
{
name_len = header.ReadInt32();
if (name_len <= 0 || name_len > name_buf.Length)
{
return(null);
}
if (name_len != header.Read(name_buf, 0, name_len))
{
return(null);
}
uint key = GetKey(name_buf, name_len);
uint offset = header.ReadUInt32() ^ key;
uint size = header.ReadUInt32() ^ key;
uint val1 = header.ReadUInt32() ^ key;
uint val2 = header.ReadUInt32() ^ key;
uint val3 = header.ReadUInt32() ^ key;
var entry = new PakEntry {
Name = Encodings.cp932.GetString(name_buf, 0, name_len),
Offset = base_offset + offset,
Size = size,
Key = key,
};
if (!entry.CheckPlacement(file.MaxOffset))
{
return(null);
}
entry.Type = FormatCatalog.Instance.GetTypeFromName(entry.Name);
dir.Add(entry);
}
return(dir);
}
}
