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(TCD): unpack/decrypt scripts.

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This commit is contained in:
morkt 2016-07-31 15:45:17 +04:00
parent ad1a9b0cda
commit fe8d9cadb5
1 changed files with 52 additions and 4 deletions
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56
ArcFormats/TopCat/ArcTCD3.cs
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@ -210,7 +210,7 @@ namespace GameRes.Formats.TopCat
if (0x43445053 == signature) // 'SPDC'
return arc.File.CreateStream (entry.Offset, entry.Size);
if (0x5367674F == signature) // 'OggS'
return DecryptOgg (arc, entry);
return RestoreOggStream (arc, entry);
var header = new byte[0x14];
arc.File.View.Read (entry.Offset, header, 0, 0x14);
@ -219,10 +219,10 @@ namespace GameRes.Formats.TopCat
header[1] -= header_key;
header[2] -= header_key;
header[3] -= header_key;
if (!Binary.AsciiEqual (header, "SPDC"))
bool spdc_entry = Binary.AsciiEqual (header, "SPDC");
if (!spdc_entry)
{
LittleEndian.Pack (signature, header, 0);
bool spdc_entry = false;
if (null == tcda.Key)
{
foreach (var key in KnownKeys.Values)
@ -252,11 +252,59 @@ namespace GameRes.Formats.TopCat
}
}
}
if (!spdc_entry && entry.Name.StartsWith ("TXT\\", StringComparison.InvariantCultureIgnoreCase)
&& signature < 0x01000000)
return OpenScript (tcda, tcde, signature);
}
var rest = arc.File.CreateStream (entry.Offset+0x14, entry.Size-0x14);
return new PrefixStream (header, rest);
}
Stream OpenScript (TcdArchive arc, TcdEntry entry, int unpacked_size)
{
byte[] data = new byte[unpacked_size];
using (var input = arc.File.CreateStream (entry.Offset+4, entry.Size-4))
UnpackLz (input, data);
DecryptScript (data);
return new MemoryStream (data);
}
void UnpackLz (Stream input, byte[] output)
{
int dst = 0;
int bits = 2;
while (dst < output.Length)
{
bits >>= 1;
if (1 == bits)
{
bits = input.ReadByte();
if (-1 == bits)
break;
bits |= 0x100;
}
if (0 == (bits & 1))
{
int count = input.ReadByte();
int offset = input.ReadByte() << 4 | count >> 4;
count = Math.Min ((count & 0xF) + 3, output.Length - dst);
Binary.CopyOverlapped (output, dst-offset, dst, count);
dst += count;
}
else
{
output[dst++] = (byte)input.ReadByte();
}
}
}
void DecryptScript (byte[] data)
{
for (int i = 0; i < data.Length; ++i)
data[i] = Binary.RotByteR (data[i], 1);
}
static Lazy<uint[]> OggCrcTable = new Lazy<uint[]> (InitOggCrcTable);
static uint[] InitOggCrcTable ()
@ -277,7 +325,7 @@ namespace GameRes.Formats.TopCat
return table;
}
Stream DecryptOgg (ArcFile arc, Entry entry)
Stream RestoreOggStream (ArcFile arc, Entry entry)
{
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
int remaining = data.Length;