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(DrgFormat): added DGD extension.

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currently there's no way to properly detect encrypted images.
This commit is contained in:
morkt 2018-05-29 21:05:39 +04:00
parent c8f696beea
commit 052beadabe
1 changed files with 25 additions and 4 deletions
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29
ArcFormats/Ikura/ImageDRG.cs
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@ -36,6 +36,11 @@ using GameRes.Utility;
namespace GameRes.Formats.Ikura namespace GameRes.Formats.Ikura
{ {
internal class DgdMetaData : ImageMetaData
{
public bool IsEncrypted;
}
[Export(typeof(ImageFormat))] [Export(typeof(ImageFormat))]
public class DrgFormat : ImageFormat public class DrgFormat : ImageFormat
{ {
@ -44,9 +49,11 @@ namespace GameRes.Formats.Ikura
public override uint Signature { get { return ~0x4c4c5546u; } } // 'FULL' public override uint Signature { get { return ~0x4c4c5546u; } } // 'FULL'
public override bool CanWrite { get { return true; } } public override bool CanWrite { get { return true; } }
static readonly byte[] DefaultKey = { 0x4D, 0x39, 0x38, 0x31, 0x31, 0x31, 0x33, 0x4D }; // "M981113M"
public DrgFormat () public DrgFormat ()
{ {
Extensions = new string[] { "drg", "ggd" }; Extensions = new string[] { "drg", "ggd", "dgd" };
Signatures = new uint[] { ~0x4c4c5546u, ~0x45555254u, ~0x48474948u }; Signatures = new uint[] { ~0x4c4c5546u, ~0x45555254u, ~0x48474948u };
} }
@ -72,29 +79,43 @@ namespace GameRes.Formats.Ikura
stream.Position = 4; stream.Position = 4;
uint width = stream.ReadUInt16(); uint width = stream.ReadUInt16();
uint height = stream.ReadUInt16(); uint height = stream.ReadUInt16();
return new ImageMetaData { return new DgdMetaData {
Width = width, Width = width,
Height = height, Height = height,
BPP = bpp, BPP = bpp,
// DGD extensions doesn't always mean encrypted contents XXX
// IsEncrypted = stream.Name.HasExtension ("dgd"),
}; };
} }
public override ImageData Read (IBinaryStream file, ImageMetaData info) public override ImageData Read (IBinaryStream file, ImageMetaData info)
{ {
file.Position = 8;
PixelFormat format; PixelFormat format;
if (24 == info.BPP) if (24 == info.BPP)
format = PixelFormats.Bgr24; format = PixelFormats.Bgr24;
else else
format = PixelFormats.Bgr565; format = PixelFormats.Bgr565;
file.Position = 8;
var meta = (DgdMetaData)info;
var input = file.AsStream;
if (meta.IsEncrypted)
input = OpenEcnryptedStream (input, DefaultKey);
int stride = ((int)info.Width * info.BPP / 8 + 3) & ~3; int stride = ((int)info.Width * info.BPP / 8 + 3) & ~3;
var pixel_data = DecodeStream (file.AsStream, stride*(int)info.Height); var pixel_data = DecodeStream (input, stride*(int)info.Height);
if (null == pixel_data) if (null == pixel_data)
throw new InvalidFormatException(); throw new InvalidFormatException();
return ImageData.Create (info, format, null, pixel_data, stride); return ImageData.Create (info, format, null, pixel_data, stride);
} }
Stream OpenEcnryptedStream (Stream input, byte[] key)
{
if (key.Length != 8)
input = new StreamRegion (input, 8, true);
return new ByteStringEncryptedStream (input, key, true);
}
byte[] DecodeStream (Stream input, int pixel_count) byte[] DecodeStream (Stream input, int pixel_count)
{ {
byte[] output = new byte[pixel_count]; byte[] output = new byte[pixel_count];