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(Mk2Opener): alter entries depending on archive version.

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This commit is contained in:
morkt 2019-01-28 19:22:12 +04:00
parent 157f9959d9
commit 574a9c5b5b
1 changed files with 67 additions and 14 deletions
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81
ArcFormats/Maika/ArcMK2.cs
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@ -32,6 +32,24 @@ using GameRes.Utility;
namespace GameRes.Formats.Maika
{
[Serializable]
internal class ScrambleScheme
{
public uint ScrambledSize;
public Tuple<byte, byte>[] ScrambleMap;
}
internal class MkArchive : ArcFile
{
public readonly ScrambleScheme Scheme;
public MkArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, ScrambleScheme scheme)
: base (arc, impl, dir)
{
Scheme = scheme;
}
}
[Export(typeof(ArchiveFormat))]
public class Mk2Opener : ArchiveFormat
{
@ -43,8 +61,10 @@ namespace GameRes.Formats.Maika
public Mk2Opener ()
{
// 'MK2.0' 'BL2.0'. 'SL1.0', 'LS2.0'
Signatures = new uint[] { 0x2E324B4D, 0x2E324C42, 0x2E314C53, 0x2E32534C };
// 'MK2.0' 'BL2.0'. 'SL1.0', 'LS2.0', 'AR2.0'
Signatures = new uint[] {
0x2E324B4D, 0x2E324C42, 0x2E314C53, 0x2E32534C, 0x2E325241
};
}
public override ArcFile TryOpen (ArcView file)
@ -54,6 +74,8 @@ namespace GameRes.Formats.Maika
int count = file.View.ReadInt32 (0x12);
if (!IsSaneCount (count))
return null;
string arc_id = file.View.ReadString (0, 5);
uint base_offset = file.View.ReadUInt16 (8);
uint index_offset = file.View.ReadUInt32 (0xE);
if (index_offset >= file.MaxOffset)
@ -94,7 +116,10 @@ namespace GameRes.Formats.Maika
}
if (0 == dir.Count)
return null;
return new ArcFile (file, this, dir);
ScrambleScheme scheme;
if (!KnownSchemes.TryGetValue (arc_id, out scheme))
scheme = DefaultScheme;
return new MkArchive (file, this, dir, scheme);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
@ -103,21 +128,31 @@ namespace GameRes.Formats.Maika
// C1/D1/E1/F1
if (0x3146 != signature && 0x3143 != signature && 0x3144 != signature && 0x3145 != signature)
return base.OpenEntry (arc, entry);
var mkarc = arc as MkArchive;
ScrambleScheme scheme = mkarc != null ? mkarc.Scheme : DefaultScheme;
uint packed_size = arc.File.View.ReadUInt32 (entry.Offset+2);
if (packed_size < 14 || packed_size > entry.Size-10)
if (packed_size < scheme.ScrambledSize || packed_size > entry.Size-10)
return base.OpenEntry (arc, entry);
Stream input;
// XXX scrambling might be applicable for 'E1' signatures only
var prefix = arc.File.View.ReadBytes (entry.Offset+10, 14);
byte t = prefix[7];
prefix[7] = prefix[11];
prefix[11] = t;
t = prefix[9];
prefix[9] = prefix[12];
prefix[12] = t;
Stream input = arc.File.CreateStream (entry.Offset+24, packed_size-14);
input = new PrefixStream (prefix, input);
if (scheme.ScrambledSize > 0)
{
var prefix = arc.File.View.ReadBytes (entry.Offset+10, scheme.ScrambledSize);
foreach (var pair in scheme.ScrambleMap)
{
byte t = prefix[pair.Item1];
prefix[pair.Item1] = prefix[pair.Item2];
prefix[pair.Item2] = t;
}
input = arc.File.CreateStream (entry.Offset+10+scheme.ScrambledSize, packed_size-scheme.ScrambledSize);
input = new PrefixStream (prefix, input);
}
else
{
input = arc.File.CreateStream (entry.Offset+10, packed_size);
}
input = new LzssStream (input);
var header = new byte[5];
@ -128,6 +163,24 @@ namespace GameRes.Formats.Maika
return new PackedStream<Bpr01Decompressor> (input);
return new PrefixStream (header, input);
}
static readonly ScrambleScheme DefaultScheme = new ScrambleScheme {
ScrambledSize = 14,
ScrambleMap = new Tuple<byte,byte>[] {
new Tuple<byte, byte> (7, 11),
new Tuple<byte, byte> (9, 12)
}
};
Dictionary<string, ScrambleScheme> KnownSchemes = new Dictionary<string, ScrambleScheme> {
{ "AR2.0", new ScrambleScheme {
ScrambledSize = 15,
ScrambleMap = new Tuple<byte,byte>[] {
new Tuple<byte, byte> (7, 13),
new Tuple<byte, byte> (9, 14)
}
} }
};
}
internal abstract class BprDecompressor : Decompressor