public override Stream OpenEntry(ArcFile arc, Entry entry)
{
var data = arc.File.View.ReadBytes(entry.Offset, entry.Size);
var cipher = new AzIsaacEncryption(entry.Size);
cipher.Decrypt(data, 0, data.Length, 0);
if (data.Length > 0x14 && Binary.AsciiEqual(data, 0, "ASB\0") && DecryptAsb(data))
{
var header = new byte[0x10];
Buffer.BlockCopy(data, 0, header, 0, 0x10);
Stream input = new MemoryStream(data, 0x10, data.Length - 0x10);
input = new ZLibStream(input, CompressionMode.Decompress);
return(new PrefixStream(header, input));
}
return(new MemoryStream(data));
}
public override ArcFile TryOpen(ArcView file)
{
byte[] header_encrypted = file.View.ReadBytes(0, 0x30);
if (header_encrypted.Length < 0x30)
{
return(null);
}
byte[] header = new byte[header_encrypted.Length];
Buffer.BlockCopy(header_encrypted, 0, header, 0, header.Length);
var cipher = new AzIsaacEncryption((uint)file.MaxOffset);
cipher.Decrypt(header, 0, header.Length, 0);
if (!Binary.AsciiEqual(header, 0, "ARC\0"))
{
return(null);
}
int ext_count = LittleEndian.ToInt32(header, 4);
int count = LittleEndian.ToInt32(header, 8);
uint index_length = LittleEndian.ToUInt32(header, 12);
if (ext_count < 1 || ext_count > 8 || !IsSaneCount(count) || index_length >= file.MaxOffset)
{
return(null);
}
var packed_index = file.View.ReadBytes(0x30, index_length);
if (packed_index.Length != index_length)
{
return(null);
}
cipher.Decrypt(packed_index, 0, packed_index.Length, 0x30);
using (var input = new MemoryStream(packed_index))
{
var dir = ParseIndex(input, count, header.Length + index_length, file.MaxOffset);
if (null == dir)
{
return(null);
}
return(new ArcFile(file, this, dir));
}
}
public override ArcFile TryOpen(ArcView file)
{
byte[] header_encrypted = file.View.ReadBytes (0, 0x30);
if (header_encrypted.Length < 0x30)
return null;
byte[] header = new byte[header_encrypted.Length];
Buffer.BlockCopy (header_encrypted, 0, header, 0, header.Length);
var cipher = new AzIsaacEncryption ((uint)file.MaxOffset);
cipher.Decrypt (header, 0, header.Length, 0);
if (!Binary.AsciiEqual (header, 0, "ARC\0"))
return null;
int ext_count = LittleEndian.ToInt32 (header, 4);
int count = LittleEndian.ToInt32 (header, 8);
uint index_length = LittleEndian.ToUInt32 (header, 12);
if (ext_count < 1 || ext_count > 8 || !IsSaneCount (count) || index_length >= file.MaxOffset)
return null;
var packed_index = file.View.ReadBytes (0x30, index_length);
if (packed_index.Length != index_length)
return null;
cipher.Decrypt (packed_index, 0, packed_index.Length, 0x30);
using (var input = new MemoryStream (packed_index))
{
var dir = ParseIndex (input, count, header.Length + index_length, file.MaxOffset);
if (null == dir)
return null;
return new ArcFile (file, this, dir);
}
}
public override Stream OpenEntry(ArcFile arc, Entry entry)
{
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
var cipher = new AzIsaacEncryption (entry.Size);
cipher.Decrypt (data, 0, data.Length, 0);
if (data.Length > 0x14 && Binary.AsciiEqual (data, 0, "ASB\0") && DecryptAsb (data))
{
var header = new byte[0x10];
Buffer.BlockCopy (data, 0, header, 0, 0x10);
Stream input = new MemoryStream (data, 0x10, data.Length-0x10);
input = new ZLibStream (input, CompressionMode.Decompress);
return new PrefixStream (header, input);
}
return new MemoryStream (data);
}
