Fix pak size-collision that crashed Quake right after the intro demo (#187)

* [Tests] Add SharpEmu.Libs.Tests project

Introduce an xunit project for the HLE libs with a minimal ICpuMemory fake,
so library-level exports and helpers can be exercised without a live guest.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* [Ampr] Disambiguate pak size-collisions by read locality

PakDirectoryTracker resolves a sequential AMPR read (offset -1) back to an
absolute pak offset by matching the requested byte count against the PACK
directory. When several files share that byte count it took the first
unconsumed match in directory order, which mis-resolves out-of-order reads:
progs/h_ogre.mdl and bots/navigation/death32c.nav are both 0x3A34 bytes, and
death32c.nav sits earlier in the directory and is never read during Quake's
intro demo, so requesting h_ogre.mdl returned the nav file's bytes. The engine
then parsed "NAV2" as a brush model, failed the version check and aborted.

Pick the unconsumed same-size entry nearest the running read cursor instead.
id archives cluster related assets and the guest streams them with locality,
so this lands on the intended file; contiguous same-size runs (the
gfx/weapons/ww_*.lmp icons) still resolve in packed order.

Verified against a Quake dump: the abort is gone, h_ogre.mdl reads correctly,
and the intro demo reaches its main loop and renders instead of dying at the
error dialog.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Directory.Packages.props

@@ -12,11 +12,14 @@ SPDX-License-Identifier: GPL-2.0-or-later
     <PackageVersion Include="Avalonia.Fonts.Inter" Version="11.3.18" />
     <PackageVersion Include="Avalonia.Themes.Fluent" Version="11.3.18" />
     <PackageVersion Include="Iced" Version="1.21.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageVersion Include="Silk.NET.Vulkan" Version="2.23.0" />
     <PackageVersion Include="Silk.NET.Vulkan.Extensions.EXT" Version="2.23.0" />
     <PackageVersion Include="Silk.NET.Vulkan.Extensions.KHR" Version="2.23.0" />
     <PackageVersion Include="Silk.NET.Windowing" Version="2.23.0" />
     <!-- Transitive of Avalonia.Desktop; pinned to fix GHSA-xrw6-gwf8-vvr9 -->
     <PackageVersion Include="Tmds.DBus.Protocol" Version="0.21.3" />
+    <PackageVersion Include="xunit" Version="2.9.3" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.1" />
   </ItemGroup>
 </Project>

SharpEmu.slnx

@@ -12,4 +12,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
     <Project Path="src/SharpEmu.Libs/SharpEmu.Libs.csproj" />
     <Project Path="src/SharpEmu.Logging/SharpEmu.Logging.csproj" />
   </Folder>
+  <Folder Name="/tests/">
+    <Project Path="tests/SharpEmu.Libs.Tests/SharpEmu.Libs.Tests.csproj" />
+  </Folder>
 </Solution>

src/SharpEmu.GUI/MainWindow.axaml.cs

@@ -1499,6 +1499,7 @@ public partial class MainWindow : Window
             2 => "Exit.EbootNotFound",
             3 => "Exit.RuntimeException",
             4 => "Exit.EmulationError",
+            -1073741819 => "Exit.EmulationError",
             _ => "Exit.Unknown",
         };
         var meaning = Localization.Instance.Get(meaningKey);

src/SharpEmu.Libs/Ampr/PakDirectoryTracker.cs

@@ -54,20 +54,41 @@ internal static class PakDirectoryTracker
 
         if (state.Directory is { } entries)
         {
+            // Several unrelated archived files can share a byte count (e.g. a head model and a bot
+            // navigation file both 0x3A34 bytes). Directory order alone then picks whichever comes
+            // first, which is wrong when the game reads them out of order. id archives cluster
+            // related assets, and the guest streams them with locality, so disambiguate collisions
+            // by choosing the unconsumed match nearest the running read cursor.
+            DirectoryEntry? best = null;
+            var bestDistance = ulong.MaxValue;
             foreach (var entry in entries)
             {
-                if (!entry.Consumed && entry.FileLen == requestedSize)
+                if (entry.Consumed || entry.FileLen != requestedSize)
                 {
-                    entry.Consumed = true;
-                    if (_trace)
-                    {
-                        Console.Error.WriteLine(
-                            $"[LOADER][TRACE] pak.directory_match: id=0x{fileId:X8} name='{entry.Name}' " +
-                            $"filepos=0x{entry.FilePos:X8} filelen=0x{entry.FileLen:X8}");
-                    }
-
-                    return entry.FilePos;
+                    continue;
                 }
+
+                var distance = entry.FilePos >= state.NextOffset
+                    ? entry.FilePos - state.NextOffset
+                    : state.NextOffset - entry.FilePos;
+                if (distance < bestDistance)
+                {
+                    bestDistance = distance;
+                    best = entry;
+                }
+            }
+
+            if (best is not null)
+            {
+                best.Consumed = true;
+                if (_trace)
+                {
+                    Console.Error.WriteLine(
+                        $"[LOADER][TRACE] pak.directory_match: id=0x{fileId:X8} name='{best.Name}' " +
+                        $"filepos=0x{best.FilePos:X8} filelen=0x{best.FileLen:X8}");
+                }
+
+                return best.FilePos;
             }
         }
 

src/SharpEmu.Libs/Json/JsonExports.cs

@@ -78,6 +78,30 @@ public static class JsonExports
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
 
+    // sce::Json::Initializer::setGlobalNullAccessCallback(const Value& (*)(ValueType, const Value*, void*), void*)
+    // Registers the guest hook invoked when a Value is accessed as the wrong type. Quake calls it
+    // during kexPSNWebAPI::Initialize and treats a non-zero return as a fatal init failure.
+    [SysAbiExport(
+        Nid = "+drDFyAS6u4",
+        ExportName = "_ZN3sce4Json11Initializer27setGlobalNullAccessCallbackEPFRKNS0_5ValueENS0_9ValueTypeEPS3_PvES7_",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int InitializerSetGlobalNullAccessCallback(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        if (thisAddress == 0)
+        {
+            ctx[CpuRegister.Rax] = unchecked((ulong)(int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        JsonObjectHeap.GlobalNullAccessCallback = ctx[CpuRegister.Rsi];
+        JsonObjectHeap.GlobalNullAccessCallbackContext = ctx[CpuRegister.Rdx];
+        TraceJson("Initializer.setGlobalNullAccessCallback", thisAddress, ctx[CpuRegister.Rsi]);
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
     [SysAbiExport(
         Nid = "WSOuge5IsCg",
         ExportName = "_ZN3sce4Json14InitParameter2C1Ev",

src/SharpEmu.Libs/Json/JsonValueExports.cs

@@ -0,0 +1,234 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+
+namespace SharpEmu.Libs.Json;
+
+// sce::Json::Value and sce::Json::String constructors, setters and destructors. Prospero titles
+// (Quake among them) build a Value tree and populate it through these before serializing it for a
+// web request; without them the imports resolve to nothing and the guest faults on the call. The
+// payload is modelled in JsonObjectHeap; here we only translate the C++ ABI (registers in, `this`
+// back out) and never write the guest object, so a stack-allocated Value/String is left intact.
+//
+// Only the complete-object variants (C1/D1) are bound — those are what standalone locals emit and
+// what the observed Prospero imports use. The base-object variants (C2/D2) are left for a title
+// that actually imports them.
+public static class JsonValueExports
+{
+    private const int MaxStringLength = 0x10000;
+
+    private static int ReturnThis(CpuContext ctx, ulong thisAddress)
+    {
+        ctx[CpuRegister.Rax] = thisAddress;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    private static int ReturnVoid(CpuContext ctx)
+    {
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    private static double ReadDoubleArg(CpuContext ctx)
+    {
+        ctx.GetXmmRegister(0, out var low, out _);
+        return BitConverter.Int64BitsToDouble(unchecked((long)low));
+    }
+
+    private static string ReadCString(CpuContext ctx, ulong address) =>
+        ctx.TryReadNullTerminatedUtf8(address, MaxStringLength, out var text) ? text : string.Empty;
+
+    // ---- sce::Json::Value constructors ----
+
+    [SysAbiExport(Nid = "qBMjqyBn3OM", ExportName = "_ZN3sce4Json5ValueC1Ev",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueDefaultConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.Null);
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "UeuWT+yNdCQ", ExportName = "_ZN3sce4Json5ValueC1Eb",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueBooleanConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromBoolean((ctx[CpuRegister.Rsi] & 0xFF) != 0));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "0lLK8+kDqmE", ExportName = "_ZN3sce4Json5ValueC1El",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueIntegerConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromInteger(unchecked((long)ctx[CpuRegister.Rsi])));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "x4AUdbhpRB0", ExportName = "_ZN3sce4Json5ValueC1Em",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueUnsignedConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromUnsignedInteger(ctx[CpuRegister.Rsi]));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "sOmU4vnx3s0", ExportName = "_ZN3sce4Json5ValueC1Ed",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueRealConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromReal(ReadDoubleArg(ctx)));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "b9V6fmppLXY", ExportName = "_ZN3sce4Json5ValueC1EPKc",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueCStringConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromString(ReadCString(ctx, ctx[CpuRegister.Rsi])));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "CbrT3dwDILo", ExportName = "_ZN3sce4Json5ValueC1ENS0_9ValueTypeE",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueTypeConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromExplicitType(unchecked((uint)ctx[CpuRegister.Rsi])));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "sZIoMRGO+jk", ExportName = "_ZN3sce4Json5ValueC1ERKNS0_6StringE",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueStringConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromString(JsonObjectHeap.GetStringOrEmpty(ctx[CpuRegister.Rsi])));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "WTtYf+cNnXI", ExportName = "_ZN3sce4Json5ValueD1Ev",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueDestructor(CpuContext ctx)
+    {
+        JsonObjectHeap.RemoveValue(ctx[CpuRegister.Rdi]);
+        return ReturnVoid(ctx);
+    }
+
+    // ---- sce::Json::Value setters (return Value&, i.e. `this`) ----
+
+    [SysAbiExport(Nid = "5yHuiWXo2gg", ExportName = "_ZN3sce4Json5Value3setEb",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueSetBoolean(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromBoolean((ctx[CpuRegister.Rsi] & 0xFF) != 0));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "QxVVYhP-mvg", ExportName = "_ZN3sce4Json5Value3setEl",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueSetInteger(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromInteger(unchecked((long)ctx[CpuRegister.Rsi])));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "SIe1ZmW7e7s", ExportName = "_ZN3sce4Json5Value3setEm",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueSetUnsigned(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromUnsignedInteger(ctx[CpuRegister.Rsi]));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "BSmWDIkV4w4", ExportName = "_ZN3sce4Json5Value3setEd",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueSetReal(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromReal(ReadDoubleArg(ctx)));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "IKQimvG9Wqs", ExportName = "_ZN3sce4Json5Value3setENS0_9ValueTypeE",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueSetType(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromExplicitType(unchecked((uint)ctx[CpuRegister.Rsi])));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "n6FC+l9DU70", ExportName = "_ZN3sce4Json5Value3setEPKc",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueSetCString(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromString(ReadCString(ctx, ctx[CpuRegister.Rsi])));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "6l3Bv2gysNc", ExportName = "_ZN3sce4Json5Value3setERKNS0_6StringE",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueSetString(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.FromString(JsonObjectHeap.GetStringOrEmpty(ctx[CpuRegister.Rsi])));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "FIjXN2TkuTs", ExportName = "_ZN3sce4Json5Value5clearEv",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int ValueClear(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetValue(thisAddress, JsonValueState.Null);
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    // ---- sce::Json::String ----
+
+    [SysAbiExport(Nid = "9KUZFjI1IxA", ExportName = "_ZN3sce4Json6StringC1EPKc",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int StringCStringConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetString(thisAddress, ReadCString(ctx, ctx[CpuRegister.Rsi]));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "qSmqLXXCPas", ExportName = "_ZN3sce4Json6StringC1Ev",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int StringDefaultConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetString(thisAddress, string.Empty);
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "0CAesfH963Q", ExportName = "_ZN3sce4Json6StringC1ERKS1_",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int StringCopyConstructor(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        JsonObjectHeap.SetString(thisAddress, JsonObjectHeap.GetStringOrEmpty(ctx[CpuRegister.Rsi]));
+        return ReturnThis(ctx, thisAddress);
+    }
+
+    [SysAbiExport(Nid = "cG1VE2HMl6c", ExportName = "_ZN3sce4Json6StringD1Ev",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceJson")]
+    public static int StringDestructor(CpuContext ctx)
+    {
+        JsonObjectHeap.RemoveString(ctx[CpuRegister.Rdi]);
+        return ReturnVoid(ctx);
+    }
+}

src/SharpEmu.Libs/Json/JsonValueModel.cs

@@ -0,0 +1,110 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Collections.Concurrent;
+
+namespace SharpEmu.Libs.Json;
+
+// sce::Json::Value is an opaque variant type (null / bool / signed / unsigned / real / string /
+// array / object). Games build one, populate it through set()/ctors and later serialize it. We
+// model the payload host-side keyed by the guest `this` pointer instead of writing into the guest
+// object: the object is often stack-allocated and its real byte layout is unknown, so writing a
+// guessed layout risks smashing an adjacent stack canary (the same failure the AudioOut2 context
+// param sizing note in this project already ran into). The guest reaches the payload only through
+// libSceJson methods, so shadowing by address is enough for the build path.
+internal enum JsonValueKind : byte
+{
+    Null = 0,
+    Boolean = 1,
+    Integer = 2,
+    UInteger = 3,
+    Real = 4,
+    String = 5,
+
+    // set(ValueType) / Value(ValueType): the guest chose the type itself. We keep its raw enum
+    // value verbatim rather than mapping it, because the canonical ValueType constants are not
+    // known from clean-room evidence and round-tripping the guest's own value is what matters.
+    ExplicitType = 6,
+}
+
+internal readonly struct JsonValueState
+{
+    private JsonValueState(
+        JsonValueKind kind,
+        bool boolean = false,
+        long integer = 0,
+        ulong unsignedInteger = 0,
+        double real = 0,
+        string? text = null,
+        uint explicitType = 0)
+    {
+        Kind = kind;
+        Boolean = boolean;
+        Integer = integer;
+        UnsignedInteger = unsignedInteger;
+        Real = real;
+        Text = text;
+        ExplicitType = explicitType;
+    }
+
+    public JsonValueKind Kind { get; }
+    public bool Boolean { get; }
+    public long Integer { get; }
+    public ulong UnsignedInteger { get; }
+    public double Real { get; }
+    public string? Text { get; }
+    public uint ExplicitType { get; }
+
+    public static JsonValueState Null { get; } = new(JsonValueKind.Null);
+
+    public static JsonValueState FromBoolean(bool value) => new(JsonValueKind.Boolean, boolean: value);
+
+    public static JsonValueState FromInteger(long value) => new(JsonValueKind.Integer, integer: value);
+
+    public static JsonValueState FromUnsignedInteger(ulong value) =>
+        new(JsonValueKind.UInteger, unsignedInteger: value);
+
+    public static JsonValueState FromReal(double value) => new(JsonValueKind.Real, real: value);
+
+    public static JsonValueState FromString(string value) => new(JsonValueKind.String, text: value);
+
+    public static JsonValueState FromExplicitType(uint value) =>
+        new(JsonValueKind.ExplicitType, explicitType: value);
+}
+
+// Shared host-side heap for the libSceJson object shadows. Keyed by the guest object address;
+// constructors overwrite and destructors remove, so guest stack-address reuse stays correct.
+internal static class JsonObjectHeap
+{
+    public static ConcurrentDictionary<ulong, JsonValueState> Values { get; } = new();
+
+    public static ConcurrentDictionary<ulong, string> Strings { get; } = new();
+
+    // Guest function the library should call when a Value is read as the wrong type. This HLE
+    // never dereferences missing members (shadows degrade to defaults), so the hook is stored for
+    // fidelity but not invoked.
+    public static ulong GlobalNullAccessCallback;
+
+    public static ulong GlobalNullAccessCallbackContext;
+
+    public static void SetValue(ulong address, JsonValueState state) => Values[address] = state;
+
+    public static void RemoveValue(ulong address) => Values.TryRemove(address, out _);
+
+    public static void SetString(ulong address, string text) => Strings[address] = text;
+
+    public static void RemoveString(ulong address) => Strings.TryRemove(address, out _);
+
+    // A missing shadow (temporary the compiler built without an out-of-line ctor, or a copy we did
+    // not track) degrades to the empty string rather than faulting.
+    public static string GetStringOrEmpty(ulong address) =>
+        Strings.TryGetValue(address, out var text) ? text : string.Empty;
+
+    internal static void ResetForTests()
+    {
+        Values.Clear();
+        Strings.Clear();
+        GlobalNullAccessCallback = 0;
+        GlobalNullAccessCallbackContext = 0;
+    }
+}

src/SharpEmu.Libs/SharpEmu.Libs.csproj

@@ -8,6 +8,10 @@ SPDX-License-Identifier: GPL-2.0-or-later
     <ProjectReference Include="..\SharpEmu.HLE\SharpEmu.HLE.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <InternalsVisibleTo Include="SharpEmu.Libs.Tests" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Silk.NET.Vulkan" />
     <PackageReference Include="Silk.NET.Vulkan.Extensions.EXT" />

tests/SharpEmu.Libs.Tests/Ampr/PakDirectoryTrackerTests.cs

@@ -0,0 +1,108 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Buffers.Binary;
+using System.Text;
+using SharpEmu.HLE;
+using SharpEmu.Libs.Ampr;
+using Xunit;
+
+namespace SharpEmu.Libs.Tests.Ampr;
+
+// PakDirectoryTracker reconstructs the absolute pak offset for a "next sequential chunk" read
+// (offset -1) from the requested byte count. When several archived files share that byte count,
+// picking by directory order alone mis-resolves out-of-order reads: Quake requested progs/h_ogre.mdl
+// (0x3A34 bytes) but the tracker returned bots/navigation/death32c.nav, which shares the size and
+// sits earlier in the directory, so the guest parsed NAV2 data as a brush model and aborted.
+public sealed class PakDirectoryTrackerTests
+{
+    private const int EntrySize = 64;
+    private const int NameLength = 56;
+
+    private readonly record struct PakEntry(string Name, uint FilePos, uint FileLen);
+
+    [Fact]
+    public void ResolveSequentialOffset_SizeCollision_PicksEntryNearestReadCursor()
+    {
+        const uint fileId = 0x5AA5_0001;
+        const uint collidingLen = 0x3A34;
+        var memory = new FakeCpuMemory(0x1_0000_0000, 0x1000);
+        var ctx = new CpuContext(memory, Generation.Gen5);
+
+        // "far" collides in size but lives early in the pak; "near" is what the guest actually wants.
+        LoadDirectory(ctx, fileId, memory, 0x1_0000_0000, dirFileOffset: 0x400, new[]
+        {
+            new PakEntry("far.dat", FilePos: 0x1000, FileLen: collidingLen),
+            new PakEntry("near.dat", FilePos: 0x9000, FileLen: collidingLen),
+        });
+
+        // Advance the read cursor next to the "near" entry, mimicking a burst of nearby asset reads.
+        PakDirectoryTracker.OnReadCompleted(ctx, fileId, destination: 0x1_0000_0000, fileOffset: 0x8800, bytesRead: 0x400);
+
+        Assert.Equal(0x9000UL, PakDirectoryTracker.ResolveSequentialOffset(fileId, collidingLen));
+        // Once the near entry is consumed, the same size resolves to the remaining match.
+        Assert.Equal(0x1000UL, PakDirectoryTracker.ResolveSequentialOffset(fileId, collidingLen));
+    }
+
+    [Fact]
+    public void ResolveSequentialOffset_ContiguousSameSizeRun_StaysInOrder()
+    {
+        const uint fileId = 0x5AA5_0002;
+        const uint runLen = 0x608;
+        var memory = new FakeCpuMemory(0x1_0000_0000, 0x1000);
+        var ctx = new CpuContext(memory, Generation.Gen5);
+
+        // A contiguous run of equal-size lumps (like Quake's gfx/weapons/ww_*.lmp) must still resolve
+        // in packed order when the guest streams them sequentially.
+        LoadDirectory(ctx, fileId, memory, 0x1_0000_0000, dirFileOffset: 0x400, new[]
+        {
+            new PakEntry("lump_a", FilePos: 0x1000, FileLen: runLen),
+            new PakEntry("lump_b", FilePos: 0x1000 + runLen, FileLen: runLen),
+            new PakEntry("lump_c", FilePos: 0x1000 + (runLen * 2), FileLen: runLen),
+        });
+
+        var first = PakDirectoryTracker.ResolveSequentialOffset(fileId, runLen);
+        PakDirectoryTracker.OnReadCompleted(ctx, fileId, destination: 0x1_0000_0000, fileOffset: first, bytesRead: runLen);
+        var second = PakDirectoryTracker.ResolveSequentialOffset(fileId, runLen);
+        PakDirectoryTracker.OnReadCompleted(ctx, fileId, destination: 0x1_0000_0000, fileOffset: second, bytesRead: runLen);
+        var third = PakDirectoryTracker.ResolveSequentialOffset(fileId, runLen);
+
+        Assert.Equal(0x1000UL, first);
+        Assert.Equal(0x1000UL + runLen, second);
+        Assert.Equal(0x1000UL + (runLen * 2), third);
+    }
+
+    // Feeds the tracker a synthetic PACK header + directory table exactly as the AMPR read path does:
+    // first the 12-byte header (which arms directory parsing), then the directory records themselves.
+    private static void LoadDirectory(
+        CpuContext ctx,
+        uint fileId,
+        FakeCpuMemory memory,
+        ulong destination,
+        ulong dirFileOffset,
+        PakEntry[] entries)
+    {
+        Span<byte> header = stackalloc byte[12];
+        header[0] = (byte)'P';
+        header[1] = (byte)'A';
+        header[2] = (byte)'C';
+        header[3] = (byte)'K';
+        BinaryPrimitives.WriteUInt32LittleEndian(header[4..8], (uint)dirFileOffset);
+        BinaryPrimitives.WriteUInt32LittleEndian(header[8..12], (uint)(entries.Length * EntrySize));
+        memory.TryWrite(destination, header);
+        PakDirectoryTracker.OnReadCompleted(ctx, fileId, destination, fileOffset: 0, bytesRead: 12);
+
+        var table = new byte[entries.Length * EntrySize];
+        for (var i = 0; i < entries.Length; i++)
+        {
+            var record = table.AsSpan(i * EntrySize, EntrySize);
+            var name = Encoding.ASCII.GetBytes(entries[i].Name);
+            name.AsSpan(0, Math.Min(name.Length, NameLength)).CopyTo(record);
+            BinaryPrimitives.WriteUInt32LittleEndian(record.Slice(56, 4), entries[i].FilePos);
+            BinaryPrimitives.WriteUInt32LittleEndian(record.Slice(60, 4), entries[i].FileLen);
+        }
+
+        memory.TryWrite(destination, table);
+        PakDirectoryTracker.OnReadCompleted(ctx, fileId, destination, dirFileOffset, (ulong)table.Length);
+    }
+}

tests/SharpEmu.Libs.Tests/FakeCpuMemory.cs

@@ -0,0 +1,68 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+
+namespace SharpEmu.Libs.Tests;
+
+// A single contiguous guest region backed by a byte[]. Enough to hand C strings and small
+// structures to HLE exports under test without a live guest.
+internal sealed class FakeCpuMemory : ICpuMemory
+{
+    private readonly ulong _base;
+    private readonly byte[] _storage;
+
+    public FakeCpuMemory(ulong baseAddress, int size)
+    {
+        _base = baseAddress;
+        _storage = new byte[size];
+    }
+
+    public bool TryRead(ulong virtualAddress, Span<byte> destination)
+    {
+        if (!TryResolve(virtualAddress, destination.Length, out var offset))
+        {
+            return false;
+        }
+
+        _storage.AsSpan(offset, destination.Length).CopyTo(destination);
+        return true;
+    }
+
+    public bool TryWrite(ulong virtualAddress, ReadOnlySpan<byte> source)
+    {
+        if (!TryResolve(virtualAddress, source.Length, out var offset))
+        {
+            return false;
+        }
+
+        source.CopyTo(_storage.AsSpan(offset, source.Length));
+        return true;
+    }
+
+    public ulong WriteCString(ulong virtualAddress, string text)
+    {
+        var bytes = System.Text.Encoding.UTF8.GetBytes(text);
+        TryWrite(virtualAddress, bytes);
+        TryWrite(virtualAddress + (ulong)bytes.Length, stackalloc byte[] { 0 });
+        return virtualAddress;
+    }
+
+    private bool TryResolve(ulong virtualAddress, int length, out int offset)
+    {
+        offset = 0;
+        if (virtualAddress < _base)
+        {
+            return false;
+        }
+
+        var relative = virtualAddress - _base;
+        if (relative + (ulong)length > (ulong)_storage.Length)
+        {
+            return false;
+        }
+
+        offset = (int)relative;
+        return true;
+    }
+}

tests/SharpEmu.Libs.Tests/Json/JsonExportRegistrationTests.cs

@@ -0,0 +1,80 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+using SharpEmu.Libs.Json;
+using Xunit;
+
+namespace SharpEmu.Libs.Tests.Json;
+
+// These NIDs came back "unresolved" in the Quake (PPSA01880) import log right before its
+// access violation. This asserts they now resolve to the Json handlers and dispatch cleanly,
+// which is the plumbing the direct-call tests cannot cover.
+[Collection("JsonObjectHeap")]
+public sealed class JsonExportRegistrationTests
+{
+    private static readonly (string Nid, string Name)[] ExpectedExports =
+    {
+        ("qBMjqyBn3OM", "_ZN3sce4Json5ValueC1Ev"),
+        ("5yHuiWXo2gg", "_ZN3sce4Json5Value3setEb"),
+        ("QxVVYhP-mvg", "_ZN3sce4Json5Value3setEl"),
+        ("SIe1ZmW7e7s", "_ZN3sce4Json5Value3setEm"),
+        ("BSmWDIkV4w4", "_ZN3sce4Json5Value3setEd"),
+        ("IKQimvG9Wqs", "_ZN3sce4Json5Value3setENS0_9ValueTypeE"),
+        ("6l3Bv2gysNc", "_ZN3sce4Json5Value3setERKNS0_6StringE"),
+        ("9KUZFjI1IxA", "_ZN3sce4Json6StringC1EPKc"),
+        ("cG1VE2HMl6c", "_ZN3sce4Json6StringD1Ev"),
+        ("+drDFyAS6u4", "_ZN3sce4Json11Initializer27setGlobalNullAccessCallbackEPFRKNS0_5ValueENS0_9ValueTypeEPS3_PvES7_"),
+    };
+
+    private static ModuleManager CreateRegisteredManager()
+    {
+        var manager = new ModuleManager();
+        manager.RegisterFromAssembly(typeof(JsonValueExports).Assembly, Generation.Gen5);
+        return manager;
+    }
+
+    [Fact]
+    public void QuakeUnresolvedJsonNids_ResolveToJsonExports()
+    {
+        var manager = CreateRegisteredManager();
+
+        foreach (var (nid, name) in ExpectedExports)
+        {
+            Assert.True(manager.TryGetExport(nid, out var export), $"NID {nid} did not register.");
+            Assert.Equal(name, export.Name);
+            Assert.Equal("libSceJson", export.LibraryName);
+        }
+    }
+
+    [Fact]
+    public void SetGlobalNullAccessCallback_StoresHookAndReturnsOk()
+    {
+        JsonObjectHeap.ResetForTests();
+        var manager = CreateRegisteredManager();
+        var ctx = new CpuContext(new FakeCpuMemory(0x1_0000_0000, 0x1000), Generation.Gen5);
+        ctx[CpuRegister.Rdi] = 0x1_0000_0000; // Initializer instance
+        ctx[CpuRegister.Rsi] = 0x8_0012_3456; // guest callback
+        ctx[CpuRegister.Rdx] = 0x1_0000_0800; // user context
+
+        Assert.True(manager.TryDispatch("+drDFyAS6u4", ctx, out var result));
+        Assert.Equal(OrbisGen2Result.ORBIS_GEN2_OK, result);
+        Assert.Equal(0UL, ctx[CpuRegister.Rax]);
+        Assert.Equal(0x8_0012_3456UL, JsonObjectHeap.GlobalNullAccessCallback);
+        Assert.Equal(0x1_0000_0800UL, JsonObjectHeap.GlobalNullAccessCallbackContext);
+    }
+
+    [Fact]
+    public void DispatchValueConstructor_RunsHandlerAndReturnsThis()
+    {
+        JsonObjectHeap.ResetForTests();
+        var manager = CreateRegisteredManager();
+        var ctx = new CpuContext(new FakeCpuMemory(0x1_0000_0000, 0x1000), Generation.Gen5);
+        ctx[CpuRegister.Rdi] = 0x1_0000_0000;
+
+        Assert.True(manager.TryDispatch("qBMjqyBn3OM", ctx, out var result));
+        Assert.Equal(OrbisGen2Result.ORBIS_GEN2_OK, result);
+        Assert.Equal(0x1_0000_0000UL, ctx[CpuRegister.Rax]);
+        Assert.Equal(JsonValueKind.Null, JsonObjectHeap.Values[0x1_0000_0000].Kind);
+    }
+}

tests/SharpEmu.Libs.Tests/Json/JsonValueExportsTests.cs

@@ -0,0 +1,188 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+using SharpEmu.Libs.Json;
+using Xunit;
+
+namespace SharpEmu.Libs.Tests.Json;
+
+// JsonObjectHeap is shared static state; both Json test classes join one collection so xUnit
+// does not run them in parallel against it.
+[Collection("JsonObjectHeap")]
+public sealed class JsonValueExportsTests
+{
+    private const ulong ThisAddress = 0x1_0000_0000;
+    private const ulong StringAddress = 0x1_0000_1000;
+    private const ulong TextAddress = 0x1_0000_2000;
+
+    private readonly FakeCpuMemory _memory = new(0x1_0000_0000, 0x10000);
+    private readonly CpuContext _ctx;
+
+    public JsonValueExportsTests()
+    {
+        JsonObjectHeap.ResetForTests();
+        _ctx = new CpuContext(_memory, Generation.Gen5);
+    }
+
+    [Fact]
+    public void ValueDefaultConstructor_RegistersNullAndReturnsThis()
+    {
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+
+        JsonValueExports.ValueDefaultConstructor(_ctx);
+
+        Assert.Equal(ThisAddress, _ctx[CpuRegister.Rax]);
+        Assert.Equal(JsonValueKind.Null, JsonObjectHeap.Values[ThisAddress].Kind);
+    }
+
+    [Theory]
+    [InlineData(0UL, false)]
+    [InlineData(1UL, true)]
+    [InlineData(0xFFFF_FF00UL, false)] // only the low byte is the bool; 0x00 low byte => false
+    public void ValueSetBoolean_StoresLowByte(ulong raw, bool expected)
+    {
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        _ctx[CpuRegister.Rsi] = raw;
+
+        JsonValueExports.ValueSetBoolean(_ctx);
+
+        var state = JsonObjectHeap.Values[ThisAddress];
+        Assert.Equal(JsonValueKind.Boolean, state.Kind);
+        Assert.Equal(expected, state.Boolean);
+        Assert.Equal(ThisAddress, _ctx[CpuRegister.Rax]);
+    }
+
+    [Fact]
+    public void ValueSetInteger_RoundTripsSignedValue()
+    {
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        _ctx[CpuRegister.Rsi] = unchecked((ulong)-42L);
+
+        JsonValueExports.ValueSetInteger(_ctx);
+
+        var state = JsonObjectHeap.Values[ThisAddress];
+        Assert.Equal(JsonValueKind.Integer, state.Kind);
+        Assert.Equal(-42L, state.Integer);
+    }
+
+    [Fact]
+    public void ValueSetUnsigned_RoundTripsFullWidth()
+    {
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        _ctx[CpuRegister.Rsi] = ulong.MaxValue;
+
+        JsonValueExports.ValueSetUnsigned(_ctx);
+
+        var state = JsonObjectHeap.Values[ThisAddress];
+        Assert.Equal(JsonValueKind.UInteger, state.Kind);
+        Assert.Equal(ulong.MaxValue, state.UnsignedInteger);
+    }
+
+    [Fact]
+    public void ValueSetReal_ReadsDoubleFromXmm0()
+    {
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        _ctx.SetXmmRegister(0, unchecked((ulong)BitConverter.DoubleToInt64Bits(3.14159)), 0);
+
+        JsonValueExports.ValueSetReal(_ctx);
+
+        var state = JsonObjectHeap.Values[ThisAddress];
+        Assert.Equal(JsonValueKind.Real, state.Kind);
+        Assert.Equal(3.14159, state.Real, precision: 10);
+    }
+
+    [Fact]
+    public void ValueSetCString_ReadsGuestString()
+    {
+        _memory.WriteCString(TextAddress, "hello json");
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        _ctx[CpuRegister.Rsi] = TextAddress;
+
+        JsonValueExports.ValueSetCString(_ctx);
+
+        var state = JsonObjectHeap.Values[ThisAddress];
+        Assert.Equal(JsonValueKind.String, state.Kind);
+        Assert.Equal("hello json", state.Text);
+    }
+
+    [Fact]
+    public void ValueSetType_KeepsRawGuestEnumValue()
+    {
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        _ctx[CpuRegister.Rsi] = 7;
+
+        JsonValueExports.ValueSetType(_ctx);
+
+        var state = JsonObjectHeap.Values[ThisAddress];
+        Assert.Equal(JsonValueKind.ExplicitType, state.Kind);
+        Assert.Equal(7u, state.ExplicitType);
+    }
+
+    [Fact]
+    public void StringConstructThenValueSetString_CopiesText()
+    {
+        _memory.WriteCString(TextAddress, "from string object");
+        _ctx[CpuRegister.Rdi] = StringAddress;
+        _ctx[CpuRegister.Rsi] = TextAddress;
+        JsonValueExports.StringCStringConstructor(_ctx);
+
+        Assert.Equal("from string object", JsonObjectHeap.Strings[StringAddress]);
+        Assert.Equal(StringAddress, _ctx[CpuRegister.Rax]);
+
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        _ctx[CpuRegister.Rsi] = StringAddress;
+        JsonValueExports.ValueSetString(_ctx);
+
+        var state = JsonObjectHeap.Values[ThisAddress];
+        Assert.Equal(JsonValueKind.String, state.Kind);
+        Assert.Equal("from string object", state.Text);
+    }
+
+    [Fact]
+    public void ValueSetString_MissingStringShadow_DegradesToEmpty()
+    {
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        _ctx[CpuRegister.Rsi] = StringAddress; // never constructed
+
+        JsonValueExports.ValueSetString(_ctx);
+
+        var state = JsonObjectHeap.Values[ThisAddress];
+        Assert.Equal(JsonValueKind.String, state.Kind);
+        Assert.Equal(string.Empty, state.Text);
+    }
+
+    [Fact]
+    public void Destructors_RemoveShadowState()
+    {
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        JsonValueExports.ValueDefaultConstructor(_ctx);
+        _ctx[CpuRegister.Rdi] = StringAddress;
+        JsonValueExports.StringDefaultConstructor(_ctx);
+
+        Assert.True(JsonObjectHeap.Values.ContainsKey(ThisAddress));
+        Assert.True(JsonObjectHeap.Strings.ContainsKey(StringAddress));
+
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        JsonValueExports.ValueDestructor(_ctx);
+        _ctx[CpuRegister.Rdi] = StringAddress;
+        JsonValueExports.StringDestructor(_ctx);
+
+        Assert.False(JsonObjectHeap.Values.ContainsKey(ThisAddress));
+        Assert.False(JsonObjectHeap.Strings.ContainsKey(StringAddress));
+        Assert.Equal(0UL, _ctx[CpuRegister.Rax]);
+    }
+
+    [Fact]
+    public void ValueSetCString_FaultingPointer_DegradesToEmptyString()
+    {
+        _ctx[CpuRegister.Rdi] = ThisAddress;
+        _ctx[CpuRegister.Rsi] = 0xDEAD_0000_0000; // outside the mapped region
+
+        JsonValueExports.ValueSetCString(_ctx);
+
+        var state = JsonObjectHeap.Values[ThisAddress];
+        Assert.Equal(JsonValueKind.String, state.Kind);
+        Assert.Equal(string.Empty, state.Text);
+    }
+}

tests/SharpEmu.Libs.Tests/SharpEmu.Libs.Tests.csproj

@@ -0,0 +1,22 @@
+<!--
+Copyright (C) 2026 SharpEmu Emulator Project
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
+
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <IsPackable>false</IsPackable>
+    <GenerateDocumentationFile>false</GenerateDocumentationFile>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\SharpEmu.Libs\SharpEmu.Libs.csproj" />
+    <ProjectReference Include="..\..\src\SharpEmu.HLE\SharpEmu.HLE.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio" />
+  </ItemGroup>
+</Project>

tests/SharpEmu.Libs.Tests/packages.lock.json

@@ -0,0 +1,212 @@
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+        "dependencies": {
+          "Microsoft.CodeCoverage": "17.14.1",
+          "Microsoft.TestPlatform.TestHost": "17.14.1"
+        }
+      },
+      "xunit": {
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+        "dependencies": {
+          "xunit.analyzers": "1.18.0",
+          "xunit.assert": "2.9.3",
+          "xunit.core": "[2.9.3]"
+        }
+      },
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+      },
+      "Microsoft.CodeCoverage": {
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