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(CRZ): reworked encryption detection.

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This commit is contained in:
morkt 2018-12-19 03:17:53 +04:00
parent b243b969e3
commit dba58b6367
1 changed files with 31 additions and 27 deletions
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58
ArcFormats/Crowd/ImageCRZ.cs
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@ -30,6 +30,7 @@ using System.IO;
using System.Linq;
using System.Windows.Media;
using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.Crowd
{
@ -54,31 +55,26 @@ namespace GameRes.Formats.Crowd
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
file.Position = 0xE;
using (var lz = new LzssStream (file.AsStream, LzssMode.Decompress, true))
using (var lz = OpenCrzStream (file))
{
lz.Config.FrameSize = 0x1000;
lz.Config.FrameFill = 0x20;
lz.Config.FrameInitPos = 0x1000 - 0x10;
var header = new byte[0x24];
if (0x11 != lz.Read (header, 0, 0x11))
int max_header_length = KnownKeys.Keys.Max (x => x.Length);
var header = new byte[max_header_length + 0x35];
lz.Read (header, 0, header.Length);
var id = Binary.GetCString (header, 0, max_header_length);
byte[] key;
if (!KnownKeys.TryGetValue (id, out key))
return null;
var key = KnownKeys.Where (x => header.AsciiEqual (x.Key)).Select (x => x.Value).FirstOrDefault();
if (null == key)
return null;
var seed = new byte[0x10];
lz.Read (seed, 0, 0x10);
lz.Read (header, 0, 0x24);
int seed_pos = id.Length + 1;
int header_pos = seed_pos + 0x10;
for (int i = 0; i < 0x24; ++i)
header[i] ^= key[i];
for (int i = 0; i < 0x24; ++i)
header[i] ^= seed[i & 0xF];
header[header_pos+i] ^= (byte)(key[i] ^ header[seed_pos + (i & 0xF)]);
return new CrzMetaData {
Width = header.ToUInt32 (4),
Height = header.ToUInt32 (0x10),
Width = header.ToUInt32 (header_pos+4),
Height = header.ToUInt32 (header_pos+0x10),
BPP = 16,
HeaderSize = header.ToInt32 (0x18) + 0x45
HeaderSize = header.ToInt32 (header_pos+0x18) + 0x34 + seed_pos
};
}
}
@ -86,22 +82,28 @@ namespace GameRes.Formats.Crowd
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
file.Position = 0xE;
using (var lz = new LzssStream (file.AsStream, LzssMode.Decompress, true))
using (var lz = OpenCrzStream (file))
{
lz.Config.FrameSize = 0x1000;
lz.Config.FrameFill = 0x20;
lz.Config.FrameInitPos = 0x1000 - 0x10;
var meta = (CrzMetaData)info;
var header = new byte[meta.HeaderSize];
lz.Read (header, 0, header.Length);
int stride = (int)info.Width * 2;
var pixels = new byte[stride * (int)info.Height];
int stride = info.iWidth * 2;
var pixels = new byte[stride * info.iHeight];
if (pixels.Length != lz.Read (pixels, 0, pixels.Length))
throw new InvalidFormatException();
return ImageData.Create (info, PixelFormats.Bgr555, null, pixels, stride);
}
}
internal Stream OpenCrzStream (IBinaryStream file)
{
var lz = new LzssStream (file.AsStream, LzssMode.Decompress, true);
lz.Config.FrameSize = 0x1000;
lz.Config.FrameFill = 0x20;
lz.Config.FrameInitPos = 0x1000 - 0x10;
return lz;
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("CrzFormat.Write not implemented");
@ -159,12 +161,14 @@ namespace GameRes.Formats.Crowd
return key;
}
IDictionary<string, byte[]> KnownKeys = new Dictionary<string, byte[]>();
CrzScheme DefaultScheme = new CrzScheme { KnownKeys = new Dictionary<string, byte[]>() };
public override ResourceScheme Scheme
{
get { return new CrzScheme { KnownKeys = KnownKeys }; }
set { KnownKeys = ((CrzScheme)value).KnownKeys; }
get { return DefaultScheme; }
set { DefaultScheme = (CrzScheme)value; }
}
IDictionary<string, byte[]> KnownKeys { get { return DefaultScheme.KnownKeys; } }
}
}