// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System;
using System.Runtime.InteropServices;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem;
 
internal sealed partial class VisualStudioMetadataReferenceManager
{
    private static readonly Guid s_IID_IMetaDataImport = new("7DAC8207-D3AE-4c75-9B67-92801A497D44");
 
    [ComImport]
    [Guid("7998EA64-7F95-48B8-86FC-17CAF48BF5CB")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    private interface IMetaDataInfo
    {
        // MetaData scope is opened (there's a reference to a MetaData interface for this scope).
        // Returns S_OK, COR_E_NOTSUPPORTED, or E_INVALIDARG (if NULL is passed).
        // STDMETHOD(GetFileMapping)(
        //    const void ** ppvData,        // [out] Pointer to the start of the mapped file.
        //    ULONG * pcbData,              // [out] Size of the mapped memory region.
        //    DWORD * pdwMappingType) PURE; // [out] Type of file mapping (code:CorFileMapping).
        [PreserveSig]
        int GetFileMapping(out IntPtr ppvData, out long pcbData, out CorFileMapping pdwMappingType);
    }
 
    // Flags returned from IMetaDataInfo.GetFileMapping
    private enum CorFileMapping : uint
    {
        Flat = 0, // Flat file mapping - file is mapped as data file (code:SEC_IMAGE flag was not 
                  // passed to code:CreateFileMapping).
#if false
        ExecutableImage = 1 // Executable image file mapping - file is mapped for execution 
                            // (either via code:LoadLibrary or code:CreateFileMapping with code:SEC_IMAGE flag).
#endif
    }
 
    private enum CorOpenFlags : uint
    {
#if false
        Read = 0,
        Write = 1,
        ReadWriteMask = 1,
 
        CopyMemory = 2,
 
        ManifestMetadata = 8,
#endif
        ReadOnly = 16,
#if false
        TakeOwnership = 32,
 
        CacheImage = 4,
        NoTypeLib = 128
#endif
    }
}