//------------------------------------------------------------------------------
// <copyright file="IStream.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>                                                                
//------------------------------------------------------------------------------

using System;
using System.Runtime.InteropServices;

namespace Experimental.System.Messaging.Interop
{
    [ComImport(),
    Guid("0000000C-0000-0000-C000-000000000046"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    internal interface IStream
    {

        int Read(IntPtr buf, int len);


        int Write(IntPtr buf, int len);

        [return: MarshalAs(UnmanagedType.I8)]
        long Seek([In, MarshalAs(UnmanagedType.I8)] long dlibMove, int dwOrigin);


        void SetSize([In, MarshalAs(UnmanagedType.I8)] long libNewSize);

        [return: MarshalAs(UnmanagedType.I8)]
        long CopyTo([In, MarshalAs(UnmanagedType.Interface)] IStream pstm,
                    [In, MarshalAs(UnmanagedType.I8)] long cb,
                    [Out, MarshalAs(UnmanagedType.LPArray)] long[] pcbRead);


        void Commit(int grfCommitFlags);


        void Revert();


        void LockRegion([In, MarshalAs(UnmanagedType.I8)] long libOffset,
                        [In, MarshalAs(UnmanagedType.I8)] long cb,
                         int dwLockType);


        void UnlockRegion([In, MarshalAs(UnmanagedType.I8)] long libOffset,
                          [In, MarshalAs(UnmanagedType.I8)] long cb,
                           int dwLockType);


        void Stat(IntPtr pStatstg, int grfStatFlag);

        [return: MarshalAs(UnmanagedType.Interface)]
        IStream Clone();
    }
}