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Update ArcDX8.cs

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Add anything that can be done without user input.
This commit is contained in:
Sławomir Śpiewak 2024-07-15 14:15:14 +02:00
parent ddabe6d2f4
commit 2e8057aa54
1 changed files with 43 additions and 6 deletions
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49
ArcFormats/DxLib/ArcDX8.cs
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@ -41,27 +41,64 @@ namespace GameRes.Formats.DxLib
public Dx8Opener ()
{
Extensions = new[] { "bin" };
Extensions = new string[] { "dxa", "hud", "usi", "med", "dat", "bin", "bcx", "wolf" };
Signatures = new[] { 0x00085844u };
}
static readonly byte[] DefaultKey = new byte[] { 0xBE, 0xC8, 0x8A, 0xF5, 0x28, 0x50, 0xC9 };
DxScheme DefaultScheme = new DxScheme { KnownKeys = new List<IDxKey>() };
internal struct DxHeaderV8
{
public long BaseOffset;
public long IndexOffset;
public uint IndexSize;
public long FileTable;
public long DirTable;
public int CodePage;
public DXA8Flags Flags;
public byte HuffmanKB;
//15 bytes of padding.
}
internal enum DXA8Flags : UInt32
{
DXA_FLAG_NO_KEY=1, //file is not encrypted
DXA_FLAG_NO_HEAD_PRESS=1<<1, //do not compress headers
}
public override ArcFile TryOpen (ArcView file)
{
var dx = new DxHeader {
var dx = new DxHeaderV8 {
IndexSize = file.View.ReadUInt32 (4),
BaseOffset = file.View.ReadInt64 (8),
IndexOffset = file.View.ReadInt64 (0x10),
FileTable = (uint)file.View.ReadInt64 (0x18),
DirTable = (uint)file.View.ReadInt64 (0x20),
FileTable = file.View.ReadInt64 (0x18),
DirTable = file.View.ReadInt64 (0x20),
CodePage = file.View.ReadInt32 (0x28),
Flags = (DXA8Flags)file.View.ReadUInt32(0x2C),
HuffmanKB = file.View.ReadByte(0x30)
};
if (dx.DirTable >= dx.IndexSize || dx.FileTable >= dx.IndexSize)
return null;
//at this point we cannot proceed without user input. If NO_HEAD_PRESS is set we could maybe restore the 7-byte key
//Otherwise (assuming the archive is encrypted) we have no way to continue without user input.
//TODO: Ask for key here.
var key = DefaultKey;
var index = file.View.ReadBytes (dx.IndexOffset, dx.IndexSize);
Decrypt (index, 0, index.Length, 0, key);
if ((dx.Flags & DXA8Flags.DXA_FLAG_NO_HEAD_PRESS) != 0)
{
var index = file.View.ReadBytes(dx.IndexOffset, dx.IndexSize);
Decrypt(index, 0, index.Length, 0, key);
} else
{
//input is compressed. First by huffman then by LZ. if it's also encrypted then we're stuck.
throw new NotImplementedException();
}
// decrypt-2
// decompress
return null;