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feat: add support for older NeXAS archives

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scientificworld
2025-12-27 22:53:12 +08:00
parent ec15a2ad84
commit c94178744b
1 changed files with 79 additions and 5 deletions
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84
ArcFormats/Nexas/ArcPAC.cs
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@@ -1,6 +1,6 @@
//! \file ArcNexas.cs
//! \date Sat Mar 14 18:03:04 2015
//! \brief NeXAS enginge resource archives implementation.
//! \brief NeXAS engine resource archives implementation.
//
// Copyright (C) 2015 by morkt
//
@@ -32,6 +32,7 @@ using System.ComponentModel.Composition;
using GameRes.Compression;
using GameRes.Formats.Strings;
using GameRes.Utility;
using System.Diagnostics;
namespace GameRes.Formats.NeXAS
{
@@ -45,6 +46,7 @@ namespace GameRes.Formats.NeXAS
None2,
Zstd,
ZstdOrNone,
NeedDecryptionOnly = 0xFDFD, // magic number, no actual meaning
}
public class PacArchive : ArcFile
@@ -79,10 +81,23 @@ namespace GameRes.Formats.NeXAS
{
if (!file.View.AsciiEqual (0, "PAC") || 'K' == file.View.ReadByte (3))
return null;
var reader = new IndexReader (file, PacEncoding.Get<Encoding>());
var dir = reader.Read();
List<Entry> dir = null;
dynamic reader = new IndexReader (file, PacEncoding.Get<Encoding>());
try
{
dir = reader.Read();
}
catch {}
if (null == dir)
return null;
{
reader = new OldIndexReader (file);
dir = reader.Read();
if (null == dir)
return null;
}
if (Compression.None == reader.PackType)
return new ArcFile (file, this, dir);
@@ -191,13 +206,72 @@ namespace GameRes.Formats.NeXAS
}
}
internal sealed class OldIndexReader
{
ArcView m_file;
uint m_header_size;
public Compression PackType { get { return Compression.NeedDecryptionOnly; } }
public OldIndexReader (ArcView file)
{
m_file = file;
m_header_size = file.View.ReadUInt32 (3);
}
List<Entry> m_dir;
public List<Entry> Read ()
{
m_dir = new List<Entry> ();
using (var input = m_file.CreateStream())
{
input.Position = 7;
while (input.Position < m_header_size)
{
byte c;
List<byte> name_buffer = new List<byte>();
while (true)
{
c = (byte)input.ReadByte();
if (c == 0) break;
name_buffer.Add ((byte)~c);
}
var name = Binary.GetCString (name_buffer.ToArray(), 0);
Debug.Write(name);
if (string.IsNullOrWhiteSpace (name))
return null;
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = input.ReadUInt32() + m_header_size;
entry.Size = input.ReadUInt32();
if (!entry.CheckPlacement (m_file.MaxOffset))
return null;
m_dir.Add (entry);
}
}
return m_dir;
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var input = arc.File.CreateStream (entry.Offset, entry.Size);
var pac = arc as PacArchive;
var pent = entry as PackedEntry;
if (null == pac || null == pent || !pent.IsPacked)
if (null == pac)
return input;
if (Compression.NeedDecryptionOnly == pac.PackType)
{
var data = new byte[entry.Size];
input.Read (data, 0, data.Length);
for (int i = 0; i < Math.Min (3, data.Length); i++)
data[i] = (byte)~data[i];
return new BinMemoryStream (data, entry.Name);
}
if (null == pent || !pent.IsPacked)
return input;
switch (pac.PackType)
{
case Compression.Lzss: