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Code Issues Projects Releases Wiki Activity

(ACTGS): archive variation.

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This commit is contained in:
morkt 2018-02-02 03:23:59 +04:00
parent 6460761487
commit 332d2a4c2a
2 changed files with 76 additions and 8 deletions
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71
ArcFormats/Actgs/ArcCG.cs
View File

@ -26,7 +26,10 @@
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.Actgs
{
@ -41,7 +44,8 @@ namespace GameRes.Formats.Actgs
public override ArcFile TryOpen (ArcView file)
{
var key = FindKey (file);
var pattern = file.View.ReadBytes (4, 8);
var key = FindKey (4, pattern);
if (null == key)
return null;
uint signature_key = key.ToUInt32 (0);
@ -61,10 +65,9 @@ namespace GameRes.Formats.Actgs
}
}
byte[] FindKey (ArcView file)
internal byte[] FindKey (int offset, byte[] pattern)
{
var pattern = file.View.ReadBytes (4, 8);
return Array.Find (KnownKeys, k => KeySequence (k).Skip (4).Take (8).SequenceEqual (pattern));
return Array.Find (KnownKeys, k => KeySequence (k).Skip (offset).Take (pattern.Length).SequenceEqual (pattern));
}
internal static IEnumerable<byte> KeySequence (byte[] key)
@ -76,4 +79,64 @@ namespace GameRes.Formats.Actgs
}
}
}
[Export(typeof(ArchiveFormat))]
public class ArcCgOpener : CgOpener
{
public override string Tag { get { return "CG/ACTGS/2"; } }
public override string Description { get { return "ACTGS engine resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (file.MaxOffset <= 0x1020)
return null;
int count = file.View.ReadInt32 (0);
if (!IsSaneCount (count))
return null;
var pattern = file.View.ReadBytes (0x1018, 8);
var key = FindKey (0x18, pattern);
if (null == key)
return null;
var dir = new List<Entry> (count);
var buffer = new byte[0x20];
long offset = 0x1000;
while (file.View.Read (offset, buffer, 0, 0x20) == 0x20)
{
offset += 0x20;
Decrypt (buffer, 0, 0x20, key);
uint size = buffer.ToUInt32 (0);
var name = Binary.GetCString (buffer, 4);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = offset;
entry.Size = size;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
offset += (size + 0xFu) & ~0xFu;
dir.Add (entry);
}
if (0 == dir.Count)
return null;
return new ActressArchive (file, this, dir, key);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var actarc = arc as ActressArchive;
if (null == actarc || null == actarc.Key)
return base.OpenEntry (arc, entry);
var header = ReadEntryHeader (actarc, entry);
Stream input;
if (entry.Size <= 0x20)
input = new BinMemoryStream (header, entry.Name);
else
input = new PrefixStream (header, arc.File.CreateStream (entry.Offset+0x20, entry.Size-0x20));
if (header.AsciiEqual ("BM"))
return input;
input.Position = 4;
return new LzssStream (input);
}
}
}

13
ArcFormats/Actgs/ArcDAT.cs
View File

@ -125,10 +125,7 @@ namespace GameRes.Formats.Actgs
var input = arc.File.CreateStream (entry.Offset+12, packed_size);
return new LzssStream (input);
}
uint length = Math.Min (entry.Size, 0x20u);
var header = new byte[length];
arc.File.View.Read (entry.Offset, header, 0, length);
Decrypt (header, 0, (int)length, actarc.Key);
var header = ReadEntryHeader (actarc, entry);
if (entry.Size <= 0x20)
return new BinMemoryStream (header, entry.Name);
var rest = arc.File.CreateStream (entry.Offset+0x20, entry.Size-0x20);
@ -150,6 +147,14 @@ namespace GameRes.Formats.Actgs
}
}
internal byte[] ReadEntryHeader (ActressArchive arc, Entry entry)
{
uint length = Math.Min (entry.Size, 0x20u);
var header = arc.File.View.ReadBytes (entry.Offset, length);
Decrypt (header, 0, header.Length, arc.Key);
return header;
}
public override ResourceScheme Scheme
{
get { return new ActressScheme { KnownKeys = KnownKeys }; }