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(YpfOpener): support YSTB scripts decryption.

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This commit is contained in:
morkt 2015-12-20 06:31:20 +04:00
parent 382b01cc9a
commit d2e7882e6d
1 changed files with 82 additions and 5 deletions
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85
ArcFormats/YuRis/ArcYPF.cs
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@ -57,6 +57,7 @@ namespace GameRes.Formats.YuRis
public byte Key;
public bool GuessKey;
public uint ExtraHeaderSize;
public uint ScriptKey;
public YpfScheme () { }
@ -76,6 +77,17 @@ namespace GameRes.Formats.YuRis
}
}
public class YpfArchive : ArcFile
{
public uint ScriptKey;
public YpfArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, uint script_key)
: base (arc, impl, dir)
{
ScriptKey = script_key;
}
}
[Serializable]
public class YuRisScheme : ResourceScheme
{
@ -115,17 +127,31 @@ namespace GameRes.Formats.YuRis
if (null == dir || 0 == dir.Count)
return null;
if (scheme.ScriptKey != 0)
return new YpfArchive (file, this, dir, scheme.ScriptKey);
else
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var input = arc.File.CreateStream (entry.Offset, entry.Size);
var packed_entry = entry as PackedEntry;
if (null == packed_entry || !packed_entry.IsPacked)
var ypf = arc as YpfArchive;
Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
if (null != packed_entry && packed_entry.IsPacked)
input = new ZLibStream (input, CompressionMode.Decompress);
uint unpacked_size = null == packed_entry ? entry.Size : packed_entry.UnpackedSize;
if (null == ypf || 0 == ypf.ScriptKey || unpacked_size <= 0x20
|| !entry.Name.EndsWith (".ybn", StringComparison.InvariantCultureIgnoreCase))
return input;
else
return new ZLibStream (input, CompressionMode.Decompress);
using (input)
{
var data = new byte[unpacked_size];
input.Read (data, 0, data.Length);
if (Binary.AsciiEqual (data, 0, "YSTB"))
DecryptYstb (data, ypf.ScriptKey);
return new MemoryStream (data);
}
}
public override ResourceOptions GetDefaultOptions ()
@ -318,6 +344,57 @@ namespace GameRes.Formats.YuRis
return SwapTable00;
}
unsafe void DecryptYstb (byte[] data, uint key)
{
if (data.Length <= 0x20)
return;
fixed (byte* raw = data)
{
uint* header = (uint*)raw;
uint version = header[1];
int first_item, last_item;
if (version >= 0x22A)
{
first_item = 3;
last_item = 7;
}
else
{
first_item = 2;
last_item = 4;
}
uint total = 0x20;
// check sizes
for (int i = first_item; i < last_item; ++i)
{
if (header[i] >= data.Length)
return;
total += header[i];
if (total > data.Length)
return;
}
if (total != data.Length)
return;
byte* data8 = raw+0x20;
for (int i = first_item; i < last_item; ++i)
{
uint size = header[i];
if (0 == size)
continue;
uint* data32 = (uint*)data8;
for (uint j = size / 4; j != 0; --j)
*data32++ ^= key;
data8 = (byte*)data32;
uint k = key;
for (uint j = size & 3; j != 0; --j)
{
*data8++ ^= (byte)k;
k >>= 8;
}
}
}
}
private class Parser
{
ArcView m_file;