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(Xp3Opener): decrypt text entries.

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This commit is contained in:
morkt 2016-02-04 09:40:42 +04:00
parent fc6192bb2f
commit 4262db76fb
1 changed files with 59 additions and 9 deletions
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68
ArcFormats/KiriKiri/ArcXP3.cs
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@ -32,8 +32,6 @@ using System.Linq;
using System.Collections.Generic; using System.Collections.Generic;
using System.ComponentModel.Composition; using System.ComponentModel.Composition;
using System.Runtime.InteropServices; using System.Runtime.InteropServices;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Diagnostics; using System.Diagnostics;
using GameRes.Compression; using GameRes.Compression;
using GameRes.Utility; using GameRes.Utility;
@ -340,20 +338,72 @@ NextEntry:
var xp3_entry = entry as Xp3Entry; var xp3_entry = entry as Xp3Entry;
if (null == xp3_entry) if (null == xp3_entry)
return arc.File.CreateStream (entry.Offset, entry.Size); return arc.File.CreateStream (entry.Offset, entry.Size);
// Trace.WriteLine (string.Format ("{0,-16} {3:X8} {1,11} {2,12}", xp3_entry.Name,
// xp3_entry.IsEncrypted ? "[encrypted]" : "", Stream input;
// xp3_entry.Segments.First().IsCompressed ? "[compressed]" : "",
// xp3_entry.Hash));
if (1 == xp3_entry.Segments.Count && !xp3_entry.IsEncrypted) if (1 == xp3_entry.Segments.Count && !xp3_entry.IsEncrypted)
{ {
var segment = xp3_entry.Segments.First(); var segment = xp3_entry.Segments.First();
if (segment.IsCompressed) if (segment.IsCompressed)
return new ZLibStream (arc.File.CreateStream (segment.Offset, segment.PackedSize), input = new ZLibStream (arc.File.CreateStream (segment.Offset, segment.PackedSize),
CompressionMode.Decompress); CompressionMode.Decompress);
else else
return arc.File.CreateStream (segment.Offset, segment.Size); input = arc.File.CreateStream (segment.Offset, segment.Size);
}
else
input = new Xp3Stream (arc.File, xp3_entry);
if (entry.Size <= 5 || "image" == entry.Type || "audio" == entry.Type)
return input;
var header = new byte[5];
input.Read (header, 0, 5);
if (0xFE == header[0] && 0xFE == header[1] && header[2] < 3 && 0xFF == header[3] && 0xFE == header[4])
return DecryptScript (header[2], input, xp3_entry.UnpackedSize);
if (!input.CanSeek)
return new PrefixStream (header, input);
input.Position = 0;
return input;
}
Stream DecryptScript (int enc_type, Stream input, uint unpacked_size)
{
using (var reader = new BinaryReader (input, Encoding.Unicode, true))
{
if (2 == enc_type)
{
reader.ReadInt64(); // packed_size
reader.ReadInt64(); // unpacked_size
return new ZLibStream (input, CompressionMode.Decompress);
}
var output = new MemoryStream ((int)unpacked_size+2);
using (var writer = new BinaryWriter (output, Encoding.Unicode, true))
{
writer.Write ('\xFEFF'); // BOM
int c;
if (1 == enc_type)
{
while ((c = reader.Read()) != -1)
{
c = (c & 0xAAAA) >> 1 | (c & 0x5555) << 1;
writer.Write ((char)c);
}
}
else
{
while ((c = reader.Read()) != -1)
{
if (c >= 0x20)
{
c = c ^ (((c & 0xFE) << 8) ^ 1);
writer.Write ((char)c);
}
}
}
}
output.Position = 0;
return output;
} }
return new Xp3Stream (arc.File, xp3_entry);
} }
public override ResourceOptions GetDefaultOptions () public override ResourceOptions GetDefaultOptions ()