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update_Astronauts

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This commit is contained in:
rewjx 2022-02-01 23:13:38 +08:00
parent 2f1ec5463b
commit 8f35b00ced
1 changed files with 58 additions and 8 deletions
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58
ArcFormats/Astronauts/ArcGXP.cs
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@ -41,19 +41,47 @@ namespace GameRes.Formats.Astronauts
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
private bool UseNameAsKey { get; set; }
static readonly byte[] KnownKey = {
0x40, 0x21, 0x28, 0x38, 0xA6, 0x6E, 0x43, 0xA5, 0x40, 0x21, 0x28, 0x38, 0xA6, 0x43, 0xA5, 0x64,
0x3E, 0x65, 0x24, 0x20, 0x46, 0x6E, 0x74,
};
public override ArcFile TryOpen(ArcView file)
{
UseNameAsKey = false;
ArcFile arc = TryOpenOrg(file);
if(arc == null)
{
//try use arc name as key
UseNameAsKey = true;
arc = TryOpenOrg(file);
}
return arc;
}
public ArcFile TryOpenOrg (ArcView file)
{
int count = file.View.ReadInt32 (0x18);
if (!IsSaneCount (count))
return null;
string arcName = Path.GetFileName(file.Name);
byte[] arcNameBytes = Encoding.ASCII.GetBytes(arcName);
long base_offset = file.View.ReadInt64 (0x28);
uint entry_key = KnownKey[0] | (1u^KnownKey[1]) << 8 | (2u^KnownKey[2]) << 16 | (3u^KnownKey[3]) << 24;
uint entry_key = 0;
if(UseNameAsKey)
{
byte b1 = (byte)(KnownKey[0] ^ arcNameBytes[0]);
byte b2 = (byte)(1u ^ KnownKey[1] ^ arcNameBytes[1 % arcNameBytes.Length]);
byte b3 = (byte)(2u ^ KnownKey[2] ^ arcNameBytes[2 % arcNameBytes.Length]);
byte b4 = (byte)(3u ^ KnownKey[3] ^ arcNameBytes[3 % arcNameBytes.Length]);
entry_key = (uint)(b1 | b2 << 8 | b3 << 16 | b4 << 24);
}
else
{
entry_key = KnownKey[0] | (1u ^ KnownKey[1]) << 8 | (2u ^ KnownKey[2]) << 16 | (3u ^ KnownKey[3]) << 24;
}
uint index_offset = 0x30;
var entry_buffer = new byte[0x100];
var dir = new List<Entry> (count);
@ -66,7 +94,15 @@ namespace GameRes.Formats.Astronauts
entry_buffer = new byte[entry_length];
if (entry_length != file.View.Read (index_offset, entry_buffer, 0, entry_length))
return null;
if (UseNameAsKey)
{
Decrypt(entry_buffer, entry_length, arcNameBytes);
}
else
{
Decrypt(entry_buffer, entry_length);
}
int name_length = LittleEndian.ToInt32 (entry_buffer, 0xC) * 2; // length in characters
if (name_length >= entry_length)
return null;
@ -85,15 +121,29 @@ namespace GameRes.Formats.Astronauts
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
if (UseNameAsKey)
{
string name = Path.GetFileName(arc.File.Name);
byte[] nameBytes = Encoding.ASCII.GetBytes(name);
Decrypt(data, entry.Size, nameBytes);
}
else
{
Decrypt(data, entry.Size);
}
return new BinMemoryStream (data, entry.Name);
}
static void Decrypt (byte[] data, uint length)
static void Decrypt (byte[] data, uint length, byte[] keyStrBytes=null)
{
for (uint i = 0; i < length; ++i)
{
data[i] ^= (byte)(i ^ KnownKey[i % KnownKey.Length]);
byte xorK = (byte)(i ^ KnownKey[i % KnownKey.Length]);
if(keyStrBytes != null)
{
xorK ^= keyStrBytes[i % keyStrBytes.Length];
}
data[i] ^= xorK;
}
}
}