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(Valkyria): Support MG2 V4 format

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Crsky
2025-04-14 05:00:46 +08:00
parent 24262179f3
commit 76932deea3
1 changed files with 64 additions and 6 deletions
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70
ArcFormats/Valkyria/ImageMG2.cs
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@@ -50,13 +50,26 @@ namespace GameRes.Formats.Valkyria
{
public override string Tag { get { return "MG2"; } }
public override string Description { get { return "Valkyria image format"; } }
public override uint Signature { get { return 0x4F43494D; } } // 'MICO'
public override uint Signature { get { return 0; } } // 'MICO'
static readonly IMg2Scheme[] KnownSchemes = { new Mg2SchemeV1(), new Mg2SchemeV2(), new Mg2SchemeV3() };
static readonly IMg2Scheme[] KnownSchemes = { new Mg2SchemeV1(), new Mg2SchemeV2(), new Mg2SchemeV3(), new Mg2SchemeV4() };
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x10);
if (!header.AsciiEqual (0, "MICO"))
{
var v0 = BitConverter.GetBytes (file.Length);
var v1 = (byte)(v0[1]+v0[3]);
var v2 = (byte)(v0[0]+v0[2]);
for (var i = 0; i < header.Length; i++)
{
header[i] ^= v1;
v1 += v2;
}
if (!header.AsciiEqual(0, "MICO"))
return null;
}
if (!header.AsciiEqual (4, "CG01") && !header.AsciiEqual (4, "CG02"))
return null;
int length = header.ToInt32 (8);
@@ -152,29 +165,50 @@ namespace GameRes.Formats.Valkyria
readonly int m_threshold;
readonly byte m_key0;
readonly byte m_key1;
readonly byte[] m_key2;
protected Mg2EncryptedStream (Stream main, int offset, int length, byte version, int threshold, byte key0, byte key1)
protected Mg2EncryptedStream (Stream main, int offset, int length, byte version, int threshold, byte key0, byte key1, int key2)
: base (main, offset, length, true)
{
m_version = version;
m_threshold = threshold;
m_key0 = key0;
m_key1 = key1;
if (m_version == 4)
{
m_key2 = new byte[length];
var v0 = BitConverter.GetBytes (key2);
var v1 = (byte)(v0[1]+v0[3]);
var v2 = (byte)(v0[0]+v0[2]);
for (var i = 0; i < length; i++)
{
m_key2[i] = v1;
v1 += v2;
}
}
}
public static Mg2EncryptedStream CreateV1 (Stream main, int offset, int length)
{
return new Mg2EncryptedStream(main, offset, length, 1, length / 5, 0, 0);
return new Mg2EncryptedStream(main, offset, length, 1, length / 5, 0, 0, 0);
}
public static Mg2EncryptedStream CreateV2 (Stream main, int offset, int length)
{
return new Mg2EncryptedStream( main, offset, length, 2, Math.Min(25, length), (byte)length, 0);
return new Mg2EncryptedStream( main, offset, length, 2, Math.Min(25, length), (byte)length, 0, 0);
}
public static Mg2EncryptedStream CreateV3 (Stream main, int offset, int length, int key)
{
return new Mg2EncryptedStream(main, offset, length, 3, 0, (byte)(key >> 1), (byte)((key & 1) + (key >> 3)));
return new Mg2EncryptedStream(main, offset, length, 3, 0, (byte)(key >> 1), (byte)((key & 1) + (key >> 3)), 0);
}
public static Mg2EncryptedStream CreateV4 (Stream main, int offset, int length, int key)
{
return new Mg2EncryptedStream(main, offset, length, 4, 0, 0, 0, key);
}
public override int Read (byte[] buffer, int offset, int count)
@@ -190,6 +224,11 @@ namespace GameRes.Formats.Valkyria
pos++;
}
}
else if (m_version == 4)
{
for (int i = 0; i < read; ++i)
buffer[offset+i] ^= m_key2[pos+i];
}
else
{
for (int i = 0; i < read && pos < m_threshold; ++i)
@@ -207,6 +246,10 @@ namespace GameRes.Formats.Valkyria
{
b ^= (byte)((pos >> 4) ^ (pos + m_key0) ^ m_key1);
}
else if (m_version == 4)
{
b ^= m_key2[pos];
}
else
{
if (b != -1 && pos < m_threshold)
@@ -260,4 +303,19 @@ namespace GameRes.Formats.Valkyria
return new ImageData(frame, info);
}
}
internal class Mg2SchemeV4 : IMg2Scheme
{
public Mg2EncryptedStream CreateStream (Stream main, int offset, int length, int key)
{
return Mg2EncryptedStream.CreateV4 (main, offset, length, key);
}
public ImageData CreateImage (BitmapSource frame, ImageMetaData info)
{
frame = new TransformedBitmap (frame, new ScaleTransform { ScaleY = -1 });
frame.Freeze ();
return new ImageData (frame, info);
}
}
}