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(MMA): added decoder.

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This commit is contained in:
morkt 2020-03-30 17:33:16 +04:00
parent dd5259b6f8
commit e78e80ca26
1 changed files with 185 additions and 12 deletions
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197
ArcFormats/Mnp/ArcMMA.cs
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@ -106,9 +106,9 @@ namespace GameRes.Formats.Mnp
{
for (int i = 0; i < dir.Count; ++i)
{
int type = index.Read();
if (-1 == type)
break;
// int type = index.Read();
// if (-1 == type)
// break;
var name = index.ReadLine();
if (null == name)
break;
@ -173,9 +173,10 @@ namespace GameRes.Formats.Mnp
internal static void Decrypt (byte[] data, int offset, int length)
{
int key_mask = DefaultKey.Length - 1;
for (int i = 0; i < length; ++i)
{
byte x = (byte)(data[offset+i] ^ DefaultKey[i & 0xF]);
byte x = (byte)(data[offset+i] ^ DefaultKey[i & key_mask]);
data[offset+i] = Binary.RotByteR (x, 3);
}
}
@ -185,10 +186,23 @@ namespace GameRes.Formats.Mnp
byte id = input.ReadUInt8();
if (id != 0xC0)
{
if (id != 0)
throw new InvalidFormatException();
input.Read (output, 0, output.Length);
return;
if ((id ^ DefaultKey[0]) == 0xC0)
{
Stream decrypted = input.AsStream;
long start_pos = input.Position;
if (start_pos != 1)
decrypted = new StreamRegion (decrypted, start_pos - 1);
decrypted = new ByteStringEncryptedStream (decrypted, DefaultKey);
input = new BinaryStream (decrypted, input.Name);
input.Position = 1;
}
else
{
if (id != 0)
throw new InvalidFormatException();
input.Read (output, 0, output.Length);
return;
}
}
int ctl = 0;
int mask = 0;
@ -212,13 +226,21 @@ namespace GameRes.Formats.Mnp
}
else
{
output[dst++] = input.ReadUInt8();
output[dst++] = Binary.RotByteL (input.ReadUInt8(), 5);
}
mask >>= 1;
}
}
static readonly string DefaultKey = "ghTuEiAdjSwElTek";
// Izayoi Renka
// static readonly string DefaultKey = "ghTuEiAdjSwElTek";
// Nanairo Kanata
// cp932.GetBytes ("w,ozqO%tl(z´1ーw｀y)iEkyzh-if)9")
static readonly byte[] DefaultKey = {
0x77, 0x2C, 0x6F, 0x7A, 0x71, 0x4F, 0x25, 0x74, 0x6C, 0x28, 0x7A, 0x81, 0x4C, 0x31, 0x81, 0x5B,
0x77, 0x81, 0x4D, 0x79, 0x29, 0x69, 0x45, 0x6B, 0x79, 0x7A, 0x68, 0x2D, 0x69, 0x66, 0x29, 0x39,
};
}
internal class MmeBaseDecoder : BinaryImageDecoder
@ -258,8 +280,8 @@ namespace GameRes.Formats.Mnp
internal void Decrypt ()
{
m_input.Read (m_output, 0, m_output.Length);
MmaOpener.Decrypt (m_output, m_header_size, m_output.Length - m_header_size);
int length = m_input.Read (m_output, 0, m_output.Length);
MmaOpener.Decrypt (m_output, 0, length);
}
}
@ -307,4 +329,155 @@ namespace GameRes.Formats.Mnp
Format = PixelFormats.Gray8;
}
}
public enum MnpMethod : int
{
Scheme03,
Scheme06,
}
[Serializable]
public class MmaScheme
{
public byte[] Key;
public MnpMethod Method;
}
internal interface IMnpDecoder
{
string ReadMmaListLine (StreamReader input);
Stream UnpackEntry (IBinaryStream input, MmaEntry entry);
}
internal abstract class MnpDecoder : IMnpDecoder
{
protected byte[] Key;
protected MnpDecoder (byte[] key)
{
Key = key;
}
public static IMnpDecoder Create (MmaScheme scheme)
{
switch (scheme.Method)
{
case MnpMethod.Scheme03: return new MnpDecoder03 (scheme.Key);
case MnpMethod.Scheme06: return new MnpDecoder06 (scheme.Key);
default: throw new UnknownEncryptionScheme();
}
}
public abstract string ReadMmaListLine (StreamReader input);
public Stream UnpackEntry (IBinaryStream input, MmaEntry entry)
{
uint flags = entry.Flags & 6;
if (6 == flags && 0 == entry.HeaderSize)
{
using (input)
{
var data = new byte[entry.UnpackedSize];
Unpack (input, data, 0);
return new BinMemoryStream (data, entry.Name);
}
}
else if (4 == flags)
{
using (input)
{
input.Position = (int)entry.HeaderSize;
var data = input.ReadBytes ((int)entry.UnpackedSize);
Decrypt (data, 0, data.Length);
return new BinMemoryStream (data, entry.Name);
}
}
return input.AsStream;
}
protected void Unpack (IBinaryStream input, byte[] output, int dst = 0)
{
byte id = input.ReadUInt8();
if (id != 0xC0)
{
if (id != 0)
throw new InvalidFormatException();
input.Read (output, 0, output.Length);
return;
}
int ctl = 0;
int mask = 0;
while (dst < output.Length)
{
if (0 == mask)
{
ctl = input.ReadByte();
if (-1 == ctl)
break;
mask = 0x80;
}
if ((ctl & mask) != 0)
{
int offset = input.ReadUInt8() << 8;
offset |= input.ReadUInt8();
int count = (offset & 0x1F) + 3;
offset = (offset >> 5) + 1;
Binary.CopyOverlapped (output, dst - offset, dst, count);
dst += count;
}
else
{
output[dst++] = Binary.RotByteL (input.ReadUInt8(), 5);
}
mask >>= 1;
}
}
protected abstract void UnpackLz (IBinaryStream input, byte[] output);
internal void Decrypt (byte[] data, int offset, int length)
{
int key_mask = Key.Length - 1;
for (int i = 0; i < length; ++i)
{
byte x = (byte)(data[offset+i] ^ Key[i & key_mask]);
data[offset+i] = Binary.RotByteR (x, 3);
}
}
}
internal class MnpDecoder03 : MnpDecoder
{
public MnpDecoder03 (byte[] key) : base (key)
{
}
public override string ReadMmaListLine (StreamReader input)
{
int type = input.Read();
if (-1 == type)
return null;
return input.ReadLine();
}
protected override void UnpackLz (IBinaryStream input, byte[] output)
{
}
}
internal class MnpDecoder06 : MnpDecoder
{
public MnpDecoder06 (byte[] key) : base (key)
{
}
public override string ReadMmaListLine (StreamReader input)
{
return input.ReadLine();
}
protected override void UnpackLz (IBinaryStream input, byte[] output)
{
}
}
}