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81 lines
3.0 KiB
81 lines
3.0 KiB
// Copyright 2026 sjackson0109 — Apache License 2.0
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using System.Runtime.InteropServices;
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namespace RDPWrap.Common;
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/// <summary>
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/// Architecture detection and WOW64 file-system redirection control.
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/// Mirrors the Arch / DisableWowRedirection / RevertWowRedirection logic
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/// from RDPWInst.dpr and RDPConf MainUnit.pas.
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/// </summary>
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public static class ArchHelper
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{
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private static readonly Lazy<byte> _arch = new(DetectArch);
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/// <summary>Raw architecture byte: 32 or 64. 0 = unsupported.</summary>
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public static byte Arch => _arch.Value;
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/// <summary><c>true</c> when running on a 64-bit Windows installation.</summary>
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public static bool Is64Bit => Arch == 64;
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/// <summary>
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/// Returns <c>true</c> when the processor architecture is supported
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/// (x86 or x64). Itanium and unknown architectures return <c>false</c>.
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/// </summary>
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public static bool IsSupported => Arch != 0;
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private static byte DetectArch()
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{
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NativeMethods.GetNativeSystemInfo(out var si);
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return si.wProcessorArchitecture switch
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{
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NativeMethods.PROCESSOR_ARCHITECTURE_INTEL => 32,
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NativeMethods.PROCESSOR_ARCHITECTURE_AMD64 => 64,
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_ => 0 // Itanium or unknown — unsupported
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};
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}
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// ── WOW64 filesystem redirection ─────────────────────────────────────────
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private static IntPtr _wow64OldValue = IntPtr.Zero;
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/// <summary>
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/// Disables WOW64 filesystem redirection so that 32-bit processes can
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/// reach the real <c>%SystemRoot%\System32</c>. Call only on 64-bit hosts.
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/// Returns <c>true</c> on success.
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/// </summary>
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public static bool DisableWow64Redirection()
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{
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if (!Is64Bit) return false;
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return NativeMethods.Wow64DisableWow64FsRedirection(out _wow64OldValue);
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}
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/// <summary>
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/// Reverts the WOW64 filesystem redirection state saved by the last call
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/// to <see cref="DisableWow64Redirection"/>.
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/// </summary>
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public static bool RevertWow64Redirection()
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{
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if (!Is64Bit) return false;
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return NativeMethods.Wow64RevertWow64FsRedirection(_wow64OldValue);
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}
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// ── Environment path expansion ────────────────────────────────────────────
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/// <summary>
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/// Expands environment strings in <paramref name="path"/>, replacing
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/// <c>%ProgramFiles%</c> with <c>%ProgramW6432%</c> on 64-bit hosts
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/// to avoid redirection to the x86 Program Files folder.
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/// </summary>
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public static string ExpandPath(string path)
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{
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if (Is64Bit)
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path = path.Replace("%ProgramFiles%", "%ProgramW6432%",
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StringComparison.OrdinalIgnoreCase);
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var buf = new System.Text.StringBuilder(1024);
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NativeMethods.ExpandEnvironmentStrings(path, buf, (uint)buf.Capacity);
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return buf.ToString();
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}
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}
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