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(TCD3): recognize obfuscated SPDC signatures.

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This commit is contained in:
morkt 2016-07-28 14:19:12 +04:00
parent 82a389622c
commit 7f70efdf58
1 changed files with 40 additions and 24 deletions
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64
ArcFormats/TopCat/ArcTCD3.cs
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@ -2,7 +2,7 @@
//! \date Thu Oct 08 13:14:57 2015
//! \brief TopCat data archives (TCD)
//
// Copyright (C) 2015 by morkt
// Copyright (C) 2015-2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
@ -60,10 +60,17 @@ namespace GameRes.Formats.TopCat
Offset = offset;
}
static readonly Lazy<ImageFormat> SpdcFormat = new Lazy<ImageFormat> (() => ImageFormat.FindByTag ("SPD"));
private static IResource DetectFileType (ArcView file, long offset)
{
uint signature = file.View.ReadUInt32 (offset);
return FormatCatalog.Instance.LookupSignature (signature).FirstOrDefault();
byte spdc_key = (byte)(signature - 'S');
if ('P' == (((signature >> 8) - spdc_key) & 0xFF) &&
'D' == (((signature >> 16) - spdc_key) & 0xFF) &&
'C' == (((signature >> 24) - spdc_key) & 0xFF))
return SpdcFormat.Value;
return AutoEntry.DetectFileType (signature);
}
}
@ -204,35 +211,45 @@ namespace GameRes.Formats.TopCat
return arc.File.CreateStream (entry.Offset, entry.Size);
if (0x5367674F == signature) // 'OggS'
return DecryptOgg (arc, entry);
var header = new byte[0x14];
arc.File.View.Read (entry.Offset, header, 0, 0x14);
bool spdc_entry = false;
if (null == tcda.Key)
byte header_key = (byte)(header[0x12] + header[0x10]);
header[0] -= header_key;
header[1] -= header_key;
header[2] -= header_key;
header[3] -= header_key;
if (!Binary.AsciiEqual (header, "SPDC"))
{
foreach (var key in KnownKeys.Values)
LittleEndian.Pack (signature, header, 0);
bool spdc_entry = false;
if (null == tcda.Key)
{
int first = signature + key * (tcde.Index + 3);
if (0x43445053 == first) // 'SPDC'
foreach (var key in KnownKeys.Values)
{
tcda.Key = key;
spdc_entry = true;
break;
int first = signature + key * (tcde.Index + 3);
if (0x43445053 == first) // 'SPDC'
{
tcda.Key = key;
spdc_entry = true;
break;
}
}
}
}
else if (0x43445053 == signature + tcda.Key.Value * (tcde.Index + 3))
{
spdc_entry = true;
}
if (spdc_entry && 0 != tcda.Key.Value)
{
unsafe
else if (0x43445053 == signature + tcda.Key.Value * (tcde.Index + 3))
{
fixed (byte* raw = header)
spdc_entry = true;
}
if (spdc_entry && 0 != tcda.Key.Value)
{
unsafe
{
int* dw = (int*)raw;
for (int i = 0; i < 5; ++i)
dw[i] += tcda.Key.Value * (tcde.Index + 3 + i);
fixed (byte* raw = header)
{
int* dw = (int*)raw;
for (int i = 0; i < 5; ++i)
dw[i] += tcda.Key.Value * (tcde.Index + 3 + i);
}
}
}
}
@ -262,8 +279,7 @@ namespace GameRes.Formats.TopCat
Stream DecryptOgg (ArcFile arc, Entry entry)
{
var data = new byte[entry.Size];
arc.File.View.Read (entry.Offset, data, 0, entry.Size);
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
int remaining = data.Length;
int src = 0;
while (remaining > 0x1B && Binary.AsciiEqual (data, src, "OggS"))