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Fix GetVariable with >4kB data

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This commit is contained in:
Lauri Kenttä
2026-04-02 08:29:02 +03:00
parent 683ee49110
commit 3d5efa2117
1 changed files with 5 additions and 1 deletions
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6
src/Efi.cs
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@@ -35,6 +35,9 @@ public class Efi {
[DllImport("kernel32.dll", SetLastError = true)]
private static extern UInt32 GetSystemFirmwareTable(UInt32 provider, UInt32 table, [MarshalAs(UnmanagedType.LPArray)] byte[] buffer, UInt32 len);
[DllImport("kernel32.dll", SetLastError = true)]
private static extern void SetLastError(UInt32 errorCode);
[StructLayout(LayoutKind.Sequential, Pack = 1)]
private struct TokPriv1Luid {
public int Count;
@@ -144,6 +147,7 @@ public class Efi {
for (UInt32 i = 4096; i <= 1024*1024; i *= 2) {
byte[] buf = new byte[i];
SetLastError(0);
UInt32 len = GetFirmwareEnvironmentVariableEx(name, guid, buf, (UInt32) buf.Length, out result.Attributes);
if (len == buf.Length) {
continue;
@@ -159,7 +163,7 @@ public class Efi {
return result;
}
const int ERROR_INVALID_FUNCTION = 0x1;
var msg = $"GetVariable: error 0x{error:X08}: ${new Win32Exception(error).Message}";
var msg = $"GetVariable: error 0x{error:X08}: {new Win32Exception(error).Message}";
throw error == ERROR_INVALID_FUNCTION ? new NotImplementedException(msg) : new Exception(msg);
}
throw new Exception("GetVariable: result exceeds 1MB");