[HLE] Add RandomExports HLE (#413)

2026-07-22 19:06:15 +08:00 · 2026-07-18 23:44:57 +03:00
parent daaeb6213e
commit bab965e394
2 changed files with 108 additions and 0 deletions
@@ -0,0 +1,69 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+using SharpEmu.Libs.Random;
+using Xunit;
+
+namespace SharpEmu.Libs.Tests.Random;
+
+public sealed class RandomExportsTests
+{
+    private const ulong BaseAddress = 0x1000;
+    private const int RandomErrorInvalid = unchecked((int)0x817C0016);
+
+    [Fact]
+    public void GetRandomNumberWritesRequestedBytes()
+    {
+        var memory = new FakeCpuMemory(BaseAddress, 64);
+        var ctx = CreateContext(memory, BaseAddress, 64);
+
+        Assert.Equal(0, RandomExports.RandomGetRandomNumber(ctx));
+
+        var bytes = new byte[64];
+        Assert.True(memory.TryRead(BaseAddress, bytes));
+        Assert.NotEqual(new byte[64], bytes);
+    }
+
+    [Theory]
+    [InlineData(0, 1)]
+    [InlineData(BaseAddress, 65)]
+    public void GetRandomNumberRejectsInvalidArguments(ulong address, ulong size)
+    {
+        var memory = new FakeCpuMemory(BaseAddress, 64);
+        var ctx = CreateContext(memory, address, size);
+
+        Assert.Equal(RandomErrorInvalid, RandomExports.RandomGetRandomNumber(ctx));
+    }
+
+    [Fact]
+    public void GetRandomNumberAcceptsEmptyRequest()
+    {
+        var memory = new FakeCpuMemory(BaseAddress, 64);
+        var ctx = CreateContext(memory, 0, 0);
+
+        Assert.Equal(0, RandomExports.RandomGetRandomNumber(ctx));
+    }
+
+    [Fact]
+    public void GetRandomNumberReportsUnmappedDestination()
+    {
+        var memory = new FakeCpuMemory(BaseAddress, 64);
+        var ctx = CreateContext(memory, BaseAddress + 64, 1);
+
+        Assert.Equal(
+            (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT,
+            RandomExports.RandomGetRandomNumber(ctx));
+    }
+
+    private static CpuContext CreateContext(
+        ICpuMemory memory,
+        ulong destination,
+        ulong size)
+    {
+        var ctx = new CpuContext(memory, Generation.Gen5);
+        ctx[CpuRegister.Rdi] = destination;
+        ctx[CpuRegister.Rsi] = size;
+        return ctx;
+    }
+}