using System;
using System.Runtime.InteropServices;

namespace DTS.Common.Utilities
{
    //disables xml comments missing warning - this file is just a wrapper for win32
    //imports, documentation can be found in win32 api or headers.
#pragma warning disable 1591

    /// <summary>
    /// win32 I/O declarations
    /// </summary>
    public class FileIOApiDeclarations
    {

        // API declarations relating to file I/O.

        // ******************************************************************************
        // API constants
        // ******************************************************************************

        public const uint GENERIC_READ = 0x80000000;
        public const uint GENERIC_WRITE = 0x40000000;
        public const uint FILE_SHARE_READ = 0x00000001;
        public const uint FILE_SHARE_WRITE = 0x00000002;
        public const uint FILE_FLAG_OVERLAPPED = 0x40000000;
        public const int INVALID_HANDLE_VALUE = -1;
        public const short OPEN_EXISTING = 3;
        public const int WAIT_TIMEOUT = 0x102;
        public const uint WAIT_OBJECT_0 = 0;
        public const uint WAIT_FAILED = 0xFFFFFFFF;
        public const uint WAIT_ABANDONED = 0x00000080;
        public const int FSCTL_SET_COMPRESSION = 0x9C040;

        // ******************************************************************************
        // Structures and classes for API calls, listed alphabetically
        // ******************************************************************************

        [StructLayout(LayoutKind.Sequential)]
        public struct OVERLAPPED
        {
            public int Internal;
            public int InternalHigh;
            public int Offset;
            public int OffsetHigh;
            public int hEvent;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SECURITY_ATTRIBUTES
        {
            public int nLength;
            public int lpSecurityDescriptor;
            public int bInheritHandle;
        }

        // ******************************************************************************
        // API functions, listed alphabetically
        // ******************************************************************************

        [DllImport("kernel32.dll")]
        public static extern int CancelIo(int hFile);

        [DllImport("kernel32.dll")]
        public static extern int CloseHandle(int hObject);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        public static extern int CreateEvent(ref SECURITY_ATTRIBUTES SecurityAttributes, int bManualReset, int bInitialState, string lpName);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        public static extern int CreateFile(string lpFileName,
                                            uint dwDesiredAccess,
                                            uint dwShareMode,
                                            ref SECURITY_ATTRIBUTES lpSecurityAttributes,
                                            int dwCreationDisposition,
                                            uint dwFlagsAndAttributes,
                                            int hTemplateFile);

        [DllImport("kernel32.dll")]
        public static extern int GetLastError();

        [DllImport("kernel32.dll")]
        //    static public extern int ReadFile(int hFile, ref byte lpBuffer, int nNumberOfBytesToRead, ref int lpNumberOfBytesRead, ref OVERLAPPED lpOverlapped);
        public static extern int ReadFile(int hFile, ref byte lpBuffer, int nNumberOfBytesToRead, ref int lpNumberOfBytesRead, int lpOverlapped);

        [DllImport("kernel32.dll")]
        public static extern uint WaitForSingleObject(int hHandle, int dwMilliseconds);

        [DllImport("kernel32.dll")]
        public static extern int WriteFile(int hFile, ref byte lpBuffer, int nNumberOfBytesToWrite, ref int lpNumberOfBytesWritten, int lpOverlapped);

        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]

        public static extern int DeviceIoControl(IntPtr hDevice,
                                                 int dwIoControlCode,
                                                 ref short lpInBuffer,
                                                 int nInBufferSize,
                                                 IntPtr lpOutBuffer,
                                                 int nOutBufferSize,
                                                 ref int lpBytesReturned,
                                                 IntPtr lpOverlapped);

        /*public static extern bool DeviceIoControl(int hDevice,
                                                  int dwIoControlCode,
                                                  ref int lpInBuffer,
                                                  uint nInBufferSize,
                                                  ref int lpOutBuffer,
                                                  uint nOutBufferSize,
                                                  out int lpBytesReturned,
                                                  uint lpOverlapped);*/
    }
#pragma warning restore 1591
}