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Nexton LikeC script engine archives.

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morkt
2015-04-21 03:39:55 +04:00
parent f929504e91
commit b74f27cd6a
1 changed files with 103 additions and 20 deletions
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123
ArcFormats/ArcLST.cs
View File

@@ -1,6 +1,6 @@
//! \file ArcLST.cs
//! \date Fri Feb 06 05:47:09 2015
//! \brief Moon. archive format.
//! \brief Nexton LikeC Script Engine archive format.
//
// Copyright (C) 2015 by morkt
//
@@ -29,13 +29,18 @@ using System.ComponentModel.Composition;
using System.IO;
using System.Text;
namespace GameRes.Formats.Tactics
namespace GameRes.Formats.Nexton
{
internal class NextonEntry : Entry
{
public byte Key;
}
[Export(typeof(ArchiveFormat))]
public class LstOpener : ArchiveFormat
{
public override string Tag { get { return "LST"; } }
public override string Description { get { return "Tactics resource archive"; } }
public override string Description { get { return "Nexton LikeC engine resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
@@ -52,28 +57,106 @@ namespace GameRes.Formats.Tactics
return null;
using (var lst = new ArcView (lstname))
{
int count = (int)(lst.View.ReadUInt32 (0) ^ 0xcccccccc);
if (count <= 0 || (4 + count*0x2c) > lst.MaxOffset)
return null;
var cp932 = Encodings.cp932.WithFatalFallback();
var dir = new List<Entry> (count);
uint index_offset = 4;
for (int i = 0; i < count; ++i)
List<Entry> dir = null;
try
{
string name = ReadName (lst, index_offset+8, 0x24, cp932);
var entry = FormatCatalog.Instance.CreateEntry (name);
entry.Offset = lst.View.ReadUInt32 (index_offset) ^ 0xcccccccc;
entry.Size = lst.View.ReadUInt32 (index_offset+4) ^ 0xcccccccc;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x2c;
dir = OpenMoon (lst, file.MaxOffset);
}
catch { /* ignore parse errors */ }
if (null == dir)
dir = OpenNexton (lst, file.MaxOffset);
if (null == dir)
return null;
return new ArcFile (file, this, dir);
}
}
private static string ReadName (ArcView view, long offset, uint size, Encoding enc)
private List<Entry> OpenMoon (ArcView lst, long max_offset)
{
int count = (int)(lst.View.ReadUInt32 (0) ^ 0xcccccccc);
if (count <= 0 || (4 + count*0x2c) > lst.MaxOffset)
return null;
var cp932 = Encodings.cp932.WithFatalFallback();
var dir = new List<Entry> (count);
uint index_offset = 4;
for (int i = 0; i < count; ++i)
{
string name = ReadName (lst, index_offset+8, 0x24, 0xcccccccc, cp932);
if (0 == name.Length)
return null;
var entry = FormatCatalog.Instance.CreateEntry (name);
entry.Offset = lst.View.ReadUInt32 (index_offset) ^ 0xcccccccc;
entry.Size = lst.View.ReadUInt32 (index_offset+4) ^ 0xcccccccc;
if (!entry.CheckPlacement (max_offset))
return null;
dir.Add (entry);
index_offset += 0x2c;
}
return dir;
}
static string[] TypeExt = new string[] { "LST", "SNX", "BMP", "PNG", "WAV", "OGG" };
private List<Entry> OpenNexton (ArcView lst, long max_offset)
{
uint key = lst.View.ReadByte (3); // guess xor key
if (0 == key)
return null;
key |= key << 8;
key |= key << 16;
int count = (int)(lst.View.ReadUInt32 (0) ^ key);
if (0 == count)
return null;
if (count <= 0 || (4 + count*0x4c) > lst.MaxOffset)
return null;
var cp932 = Encodings.cp932.WithFatalFallback();
var dir = new List<Entry> (count);
uint index_offset = 4;
for (int i = 0; i < count; ++i)
{
string name = ReadName (lst, index_offset+8, 0x40, key, cp932);
if (0 == name.Length)
return null;
var entry = new NextonEntry {
Name = name,
Offset = lst.View.ReadUInt32 (index_offset) ^ key,
Size = lst.View.ReadUInt32 (index_offset+4) ^ key,
};
if (!entry.CheckPlacement (max_offset))
return null;
int type = lst.View.ReadInt32 (index_offset+0x48);
if (type >= 0 && type < TypeExt.Length)
{
entry.Name = Path.ChangeExtension (name, TypeExt[type]);
if (2 == type || 3 == type)
entry.Type = "image";
else if (4 == type || 5 == type)
entry.Type = "audio";
else if (1 == type)
{
entry.Type = "script";
entry.Key = (byte)(key + 1);
}
}
dir.Add (entry);
index_offset += 0x4c;
}
return dir;
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var nxent = entry as NextonEntry;
if (null == nxent || 0 == nxent.Key)
return arc.File.CreateStream (entry.Offset, entry.Size);
var data = new byte[entry.Size];
arc.File.View.Read (entry.Offset, data, 0, entry.Size);
for (int i = 0; i != data.Length; ++i)
data[i] ^= nxent.Key;
return new MemoryStream (data);
}
private static string ReadName (ArcView view, long offset, uint size, uint key, Encoding enc)
{
byte[] buffer = new byte[size];
uint n;
@@ -82,7 +165,7 @@ namespace GameRes.Formats.Tactics
byte b = view.View.ReadByte (offset+n);
if (0 == b)
break;
buffer[n] = (byte)(b^0xcc);
buffer[n] = (byte)(b^key);
}
return enc.GetString (buffer, 0, (int)n);
}