[npManager] initial Network Platform implement (just set game title etc.)

src/SharpEmu.Libs/Np/NpManagerExports.cs

@@ -0,0 +1,67 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+
+namespace SharpEmu.Libs.Np;
+
+public static class NpManagerExports
+{
+    private const int NpTitleIdSize = 16;
+    private const int NpTitleSecretSize = 128;
+
+    [SysAbiExport(
+        Nid = "Ec63y59l9tw",
+        ExportName = "sceNpSetNpTitleId",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceNpManager")]
+    public static int NpSetNpTitleId(CpuContext ctx)
+    {
+        var titleIdAddress = ctx[CpuRegister.Rdi];
+        var titleSecretAddress = ctx[CpuRegister.Rsi];
+        if (titleIdAddress == 0 || titleSecretAddress == 0)
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        Span<byte> titleId = stackalloc byte[NpTitleIdSize];
+        Span<byte> titleSecret = stackalloc byte[NpTitleSecretSize];
+        if (!ctx.Memory.TryRead(titleIdAddress, titleId) ||
+            !ctx.Memory.TryRead(titleSecretAddress, titleSecret))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        TraceNp($"set_np_title_id title='{ReadTitleId(titleId)}'");
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
+    }
+
+    private static int SetReturn(CpuContext ctx, OrbisGen2Result result)
+    {
+        ctx[CpuRegister.Rax] = unchecked((ulong)(int)result);
+        return (int)result;
+    }
+
+    private static string ReadTitleId(ReadOnlySpan<byte> bytes)
+    {
+        var length = 0;
+        while (length < 12 && length < bytes.Length && bytes[length] != 0)
+        {
+            length++;
+        }
+
+        return length == 0
+            ? string.Empty
+            : System.Text.Encoding.ASCII.GetString(bytes[..length]);
+    }
+
+    private static void TraceNp(string message)
+    {
+        if (!string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_NP"), "1", StringComparison.Ordinal))
+        {
+            return;
+        }
+
+        Console.Error.WriteLine($"[LOADER][TRACE] np.{message}");
+    }
+}