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(Valkyria): support "MICOCG02"

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tested game: https://vndb.org/v48766
This commit is contained in:
Dir-A 2024-10-01 06:49:25 +08:00
parent 499ac02c64
commit ccc7c8032b
1 changed files with 64 additions and 19 deletions
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83
ArcFormats/Valkyria/ImageMG2.cs
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@ -41,7 +41,7 @@ namespace GameRes.Formats.Valkyria
internal interface IMg2Scheme
{
Mg2EncryptedStream CreateStream (Stream main, int offset, int length);
Mg2EncryptedStream CreateStream (Stream main, int offset, int length, int key);
ImageData CreateImage (BitmapSource bitmap, ImageMetaData info);
}
@ -52,17 +52,17 @@ namespace GameRes.Formats.Valkyria
public override string Description { get { return "Valkyria image format"; } }
public override uint Signature { get { return 0x4F43494D; } } // 'MICO'
static readonly IMg2Scheme[] KnownSchemes = { new Mg2SchemeV1(), new Mg2SchemeV2() };
static readonly IMg2Scheme[] KnownSchemes = { new Mg2SchemeV1(), new Mg2SchemeV2(), new Mg2SchemeV3() };
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x10);
if (!header.AsciiEqual (4, "CG01"))
if (!header.AsciiEqual (4, "CG01") && !header.AsciiEqual (4, "CG02"))
return null;
int length = header.ToInt32 (8);
foreach (var scheme in KnownSchemes)
{
using (var input = scheme.CreateStream (file.AsStream, 0x10, length))
using (var input = scheme.CreateStream (file.AsStream, 0x10, length, length))
using (var img = new BinaryStream (input, file.Name))
{
ImageFormat format;
@ -102,7 +102,7 @@ namespace GameRes.Formats.Valkyria
BitmapSource ReadBitmapSource (Stream file, Mg2MetaData meta)
{
BitmapSource frame;
using (var input = meta.Scheme.CreateStream (file, 0x10, meta.ImageLength))
using (var input = meta.Scheme.CreateStream (file, 0x10, meta.ImageLength, meta.ImageLength))
using (var img = new BinaryStream (input, meta.FileName))
{
var image = meta.Format.Read (img, meta);
@ -116,7 +116,7 @@ namespace GameRes.Formats.Valkyria
var pixels = new byte[stride * (int)meta.Height];
frame.CopyPixels (pixels, stride, 0);
using (var input = meta.Scheme.CreateStream (file, 0x10+meta.ImageLength, meta.AlphaLength))
using (var input = meta.Scheme.CreateStream (file, 0x10+meta.ImageLength, meta.AlphaLength, meta.ImageLength))
{
var decoder = BitmapDecoder.Create (input, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
BitmapSource alpha_frame = decoder.Frames[0];
@ -148,32 +148,53 @@ namespace GameRes.Formats.Valkyria
internal class Mg2EncryptedStream : StreamRegion
{
readonly byte m_version;
readonly int m_threshold;
readonly byte m_key;
readonly byte m_key0;
readonly byte m_key1;
protected Mg2EncryptedStream (Stream main, int offset, int length, int threshold, byte key)
protected Mg2EncryptedStream (Stream main, int offset, int length, byte version, int threshold, byte key0, byte key1)
: base (main, offset, length, true)
{
m_version = version;
m_threshold = threshold;
m_key = key;
m_key0 = key0;
m_key1 = key1;
}
public static Mg2EncryptedStream CreateV1 (Stream main, int offset, int length)
{
return new Mg2EncryptedStream (main, offset, length, length / 5, 0);
return new Mg2EncryptedStream(main, offset, length, 1, length / 5, 0, 0);
}
public static Mg2EncryptedStream CreateV2 (Stream main, int offset, int length)
{
return new Mg2EncryptedStream (main, offset, length, Math.Min (25, length), (byte)length);
return new Mg2EncryptedStream( main, offset, length, 2, Math.Min(25, length), (byte)length, 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)));
}
public override int Read (byte[] buffer, int offset, int count)
{
int pos = (int)Position;
int read = base.Read (buffer, offset, count);
for (int i = 0; i < read && pos < m_threshold; ++i)
buffer[offset+i] ^= (byte)(m_key + pos++);
long pos = Position;
int read = base.Read(buffer, offset, count);
if (m_version == 3)
{
for (int i = 0; i < read; ++i)
{
buffer[offset+i] ^= (byte)((pos >> 4) ^ (pos + m_key0) ^ m_key1);
pos++;
}
}
else
{
for (int i = 0; i < read && pos < m_threshold; ++i)
buffer[offset+i] ^= (byte)(m_key0 + pos++);
}
return read;
}
@ -181,15 +202,24 @@ namespace GameRes.Formats.Valkyria
{
long pos = Position;
int b = base.ReadByte();
if (b != -1 && pos < m_threshold)
b ^= (byte)(m_key + pos);
if (m_version == 3)
{
b ^= (byte)((pos >> 4) ^ (pos + m_key0) ^ m_key1);
}
else
{
if (b != -1 && pos < m_threshold)
b ^= (byte)(m_key0 + pos);
}
return b;
}
}
internal class Mg2SchemeV1 : IMg2Scheme
{
public Mg2EncryptedStream CreateStream (Stream main, int offset, int length)
public Mg2EncryptedStream CreateStream (Stream main, int offset, int length, int key)
{
return Mg2EncryptedStream.CreateV1 (main, offset, length);
}
@ -203,7 +233,7 @@ namespace GameRes.Formats.Valkyria
internal class Mg2SchemeV2 : IMg2Scheme
{
public Mg2EncryptedStream CreateStream (Stream main, int offset, int length)
public Mg2EncryptedStream CreateStream (Stream main, int offset, int length, int key)
{
return Mg2EncryptedStream.CreateV2 (main, offset, length);
}
@ -215,4 +245,19 @@ namespace GameRes.Formats.Valkyria
return new ImageData (frame, info);
}
}
internal class Mg2SchemeV3 : IMg2Scheme
{
public Mg2EncryptedStream CreateStream (Stream main, int offset, int length, int key)
{
return Mg2EncryptedStream.CreateV3 (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);
}
}
}