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support for key-layout offset shifting from build config #36

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Merged
ZingBallyhoo merged 3 commits into from
Sep 24, 2026
Merged

support for key-layout offset shifting from build config #36

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87ffb1f
added support for offset shifting
Hazno-dev Sep 24, 2026
179a915
removed shift
Hazno-dev Sep 24, 2026
cf80230
extremely critical fix for var name
Hazno-dev Sep 24, 2026
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15 changes: 9 additions & 6 deletions TACTLib/Container/StaticContainerHandler.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
using System.Buffers.Binary;
using System.IO;
using System.Linq;
using System.Numerics;
using CommunityToolkit.HighPerformance.Helpers;
using TACTLib.Client;
using TACTLib.Helpers;
Expand All @@ -18,16 +19,17 @@ private struct KeyLayout {
public byte m_chunkBits;
public byte m_archiveBits;
public byte m_offsetBits;
public byte m_offsetMultiplier;
}

public StaticContainerHandler(ClientHandler client) {
m_client = client;
if (client.BasePath == null) throw new Exception("no 'BasePath' specified");
m_containerDirectory = Path.Combine(client.BasePath, GetContainerDirectory(client.Product));

m_keyLayoutIndexBits = byte.Parse(client.ConfigHandler.BuildConfig.Values["key-layout-index-bits"][0]);
m_keyLayouts = new KeyLayout[Math.Max((int)Math.Pow(2, m_keyLayoutIndexBits), 1)];

foreach (var keyLayoutPair in client.ConfigHandler.BuildConfig.Values
.Where(static x => x.Key.StartsWith("key-layout-") && x.Key != "key-layout-index-bits")) {

Expand All @@ -36,7 +38,8 @@ public StaticContainerHandler(ClientHandler client) {
m_keyLayouts[layoutIndex] = new KeyLayout {
m_chunkBits = byte.Parse(keyLayoutPair.Value[0]),
m_archiveBits = byte.Parse(keyLayoutPair.Value[1]),
m_offsetBits = byte.Parse(keyLayoutPair.Value[2])
m_offsetBits = byte.Parse(keyLayoutPair.Value[2]),
m_offsetMultiplier = keyLayoutPair.Value.Count > 3 ? byte.Parse(keyLayoutPair.Value[3]) : (byte)1
};
}
}
Expand All @@ -55,7 +58,7 @@ private void ExtractStorageLocation(FullEKey ekey, out ulong chunk, out ulong ar
var keyLayoutIndexBitOffset = 56-keyLayoutBitCount;
var keyLayoutIndex = BitHelper.ExtractRange(ekeyHiUl, (byte)keyLayoutIndexBitOffset, keyLayoutBitCount);
var keyLayout = m_keyLayouts[keyLayoutIndex];

var chunkBitCount = keyLayout.m_chunkBits;
var chunkBitOffset = keyLayoutIndexBitOffset-chunkBitCount;
chunk = BitHelper.ExtractRange(ekeyHiUl, (byte)chunkBitOffset, chunkBitCount);
Expand All @@ -66,7 +69,7 @@ private void ExtractStorageLocation(FullEKey ekey, out ulong chunk, out ulong ar

var offsetBitCount = keyLayout.m_offsetBits;
var offsetBitOffset = archiveBitOffset-offsetBitCount;
offset = BitHelper.ExtractRange(ekeyHiUl, (byte)offsetBitOffset, offsetBitCount);
offset = BitHelper.ExtractRange(ekeyHiUl, (byte) offsetBitOffset, offsetBitCount) * keyLayout.m_offsetMultiplier;
}

private static string GetFileName(ulong chunk, ulong archive) {
Expand All @@ -79,7 +82,7 @@ private string GetFilePath(ulong chunk, ulong archive) {

public ArraySegment<byte>? OpenEKey(FullEKey ekey, int eSize) {
ExtractStorageLocation(ekey, out var chunk, out var archive, out var offset);

using var stream = File.OpenRead(GetFilePath(chunk, archive));
stream.Position = (long)offset;
var data = GC.AllocateUninitializedArray<byte>(eSize);
Expand Down