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implemented 'Nemesis' compression.

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morkt
2016-01-25 09:02:39 +04:00
parent 0b1f554660
commit 3a5b3f7ca0
4 changed files with 368 additions and 58 deletions
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106
ArcFormats/Entis/ArcNOA.cs
View File

@@ -123,56 +123,61 @@ namespace GameRes.Formats.Entis
ulong size = arc.File.View.ReadUInt64 (entry.Offset+8);
if (size > int.MaxValue)
throw new FileSizeException();
if (0 == size)
if (size <= 4)
return Stream.Null;
if (EncType.ERISACode == nent.Encryption)
{
using (var enc = arc.File.CreateStream (entry.Offset+0x10, (uint)size-4))
return DecodeNemesis (enc);
}
var narc = arc as NoaArchive;
var input = arc.File.CreateStream (entry.Offset+0x10, (uint)size);
try
{
var narc = arc as NoaArchive;
if (0 == nent.Encryption || size < 4 || null == narc || null == narc.Password)
return input;
if (0x40000000 != nent.Encryption)
{
Trace.WriteLine (string.Format ("{0}: unknown encryption scheme 0x{1:x8}",
nent.Name, nent.Encryption));
return input;
}
uint nTotalBytes = (uint)(size - 4);
var pBSHF = new BSHFDecodeContext (0x10000);
pBSHF.AttachInputFile (input);
pBSHF.PrepareToDecodeBSHFCode (narc.Password);
if (EncType.Raw == nent.Encryption || null == narc || null == narc.Password)
return input;
byte[] buf = new byte[nTotalBytes];
uint decoded = pBSHF.DecodeBSHFCodeBytes (buf, nTotalBytes);
if (decoded < nTotalBytes)
throw new EndOfStreamException ("Unexpected end of encrypted stream");
/* Something wrong with preceding length calculation, resulting CRC doesn't match
byte[] bufCRC = new byte[4];
int iCRC = 0;
for (int i = 0; i < buf.Length; ++i)
{
bufCRC[iCRC] ^= buf[i];
iCRC = (iCRC + 1) & 0x03;
}
uint orgCRC = arc.File.View.ReadUInt32 (entry.Offset+0x10+nTotalBytes);
uint crc = LittleEndian.ToUInt32 (bufCRC, 0);
if (orgCRC != crc)
{
Trace.WriteLine (string.Format ("{0}: CRC mismatch", nent.Name));
input.Position = 0;
return input;
}
*/
input.Dispose();
return new MemoryStream (buf);
}
catch
if (EncType.BSHFCrypt == nent.Encryption)
{
input.Dispose();
throw;
using (input)
return DecodeBSHF (input, narc.Password);
}
Trace.WriteLine (string.Format ("{0}: encryption scheme 0x{1:x8} not implemented",
nent.Name, nent.Encryption));
return input;
}
Stream DecodeNemesis (Stream input)
{
var decoder = new NemesisDecodeContext();
decoder.AttachInputFile (input);
decoder.PrepareToDecodeERISANCode();
var file = new MemoryStream ((int)input.Length);
var buffer = new byte[0x10000];
for (;;)
{
int read = (int)decoder.DecodeNemesisCodeBytes (buffer, 0x10000);
if (0 == read)
break;
file.Write (buffer, 0, read);
}
file.Position = 0;
return file;
}
Stream DecodeBSHF (Stream input, string password)
{
uint nTotalBytes = (uint)input.Length - 4;
var pBSHF = new BSHFDecodeContext (0x10000);
pBSHF.AttachInputFile (input);
pBSHF.PrepareToDecodeBSHFCode (password);
byte[] buf = new byte[nTotalBytes];
uint decoded = pBSHF.DecodeBSHFCodeBytes (buf, nTotalBytes);
if (decoded < nTotalBytes)
throw new EndOfStreamException ("Unexpected end of encrypted stream");
return new MemoryStream (buf);
}
public override ResourceOptions GetDefaultOptions ()
@@ -188,6 +193,16 @@ namespace GameRes.Formats.Entis
return new GUI.WidgetNOA();
}
internal static class EncType
{
public const uint Raw = 0x00000000;
public const uint ERISACode = 0x80000010;
public const uint BSHFCrypt = 0x40000000;
public const uint SimpleCrypt32 = 0x20000000;
public const uint ERISACrypt = 0xC0000010;
public const uint ERISACrypt32 = 0xA0000010;
}
internal class IndexReader
{
ArcView m_file;
@@ -235,8 +250,7 @@ namespace GameRes.Formats.Entis
dir_offset += 4;
entry.Encryption = m_file.View.ReadUInt32 (dir_offset);
if (0 != entry.Encryption)
m_found_encrypted = true;
m_found_encrypted = m_found_encrypted || (EncType.Raw != entry.Encryption && EncType.ERISACode != entry.Encryption);
dir_offset += 4;
entry.Offset = base_offset + m_file.View.ReadInt64 (dir_offset);