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(PkOpener): unpack/decrypt scripts.

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This commit is contained in:
morkt 2016-07-29 06:53:34 +04:00
parent 203cb64a03
commit ec95df7eea
1 changed files with 54 additions and 0 deletions
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54
ArcFormats/UMeSoft/ArcPK.cs
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@ -78,5 +78,59 @@ namespace GameRes.Formats.UMeSoft
return null;
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (!entry.Name.EndsWith (".scr", StringComparison.InvariantCultureIgnoreCase) &&
!entry.Name.EndsWith (".tbl", StringComparison.InvariantCultureIgnoreCase))
return base.OpenEntry (arc, entry);
int output_size = arc.File.View.ReadInt32 (entry.Offset);
if (output_size <= 0)
return base.OpenEntry (arc, entry);
using (var input = arc.File.CreateStream (entry.Offset+4, entry.Size-4))
{
var data = LzUnpack (input, output_size);
for (int i = 0; i < data.Length; ++i)
data[i] ^= 0x42;
return new MemoryStream (data);
}
}
byte[] LzUnpack (Stream input, int output_size)
{
var output = new byte[output_size];
int ctl = 0;
int mask = 0;
int dst = 0;
while (dst < output_size)
{
mask >>= 1;
if (0 == mask)
{
ctl = input.ReadByte();
if (-1 == ctl)
break;
mask = 0x80;
}
if (0 == (ctl & mask))
{
output[dst++] = (byte)input.ReadByte();
}
else
{
int lo = input.ReadByte();
int hi = input.ReadByte();
if (-1 == lo || -1 == hi)
break;
int offset = hi << 4 | lo >> 4;
if (0 == offset)
break;
int count = (lo & 0xF) + 3;
Binary.CopyOverlapped (output, dst - offset, dst, count);
dst += count;
}
}
return output;
}
}
}