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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--           G N A T . S E R I A L _ C O M M U N I C A T I O N S            --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--                    Copyright (C) 2007-2010, AdaCore                      --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This is the Windows implementation of this package

with Ada.Unchecked_Deallocation; use Ada;

with Ada.Streams;                use Ada.Streams;

with System;               use System;

with System.Communication; use System.Communication;

with System.CRTL;          use System.CRTL;

with System.Win32;         use System.Win32;

with System.Win32.Ext;     use System.Win32.Ext;

package body GNAT.Serial_Communications is

   --  Common types

   type Port_Data is new HANDLE;

   C_Bits      : constant array (Data_Bits) of Interfaces.C.unsigned := (8, 7);

   C_Parity    : constant array (Parity_Check) of Interfaces.C.unsigned :=

                   (None => NOPARITY, Odd => ODDPARITY, Even => EVENPARITY);

   C_Stop_Bits : constant array (Stop_Bits_Number) of Interfaces.C.unsigned :=

                   (One => ONESTOPBIT, Two => TWOSTOPBITS);

   -----------

   -- Files --

   -----------

   procedure Raise_Error (Message : String; Error : DWORD := GetLastError);

   pragma No_Return (Raise_Error);

   -----------

   -- Close --

   -----------

   procedure Close (Port : in out Serial_Port) is

      procedure Unchecked_Free is

        new Unchecked_Deallocation (Port_Data, Port_Data_Access);

      Success : BOOL;

   begin

      if Port.H /= null then

         Success := CloseHandle (HANDLE (Port.H.all));

         Unchecked_Free (Port.H);

         if Success = Win32.FALSE then

            Raise_Error ("error closing the port");

         end if;

      end if;

   end Close;

   ----------

   -- Name --

   ----------

   function Name (Number : Positive) return Port_Name is

      N_Img : constant String := Positive'Image (Number);

   begin

      return Port_Name ("COM" & N_Img (N_Img'First + 1 .. N_Img'Last) & ':');

   end Name;

   ----------

   -- Open --

   ----------

   procedure Open

     (Port : out Serial_Port;

      Name : Port_Name)

   is

      C_Name  : constant String := String (Name) & ASCII.NUL;

      Success : BOOL;

      pragma Unreferenced (Success);

   begin

      if Port.H = null then

         Port.H := new Port_Data;

      else

         Success := CloseHandle (HANDLE (Port.H.all));

      end if;

      Port.H.all := CreateFileA

        (lpFileName            => C_Name (C_Name'First)'Address,

         dwDesiredAccess       => GENERIC_READ or GENERIC_WRITE,

         dwShareMode           => 0,

         lpSecurityAttributes  => null,

         dwCreationDisposition => OPEN_EXISTING,

         dwFlagsAndAttributes  => 0,

         hTemplateFile         => 0);

      if Port.H.all = 0 then

         Raise_Error ("cannot open com port");

      end if;

   end Open;

   -----------------

   -- Raise_Error --

   -----------------

   procedure Raise_Error (Message : String; Error : DWORD := GetLastError) is

   begin

      raise Serial_Error with Message & " (" & DWORD'Image (Error) & ')';

   end Raise_Error;

   ----------

   -- Read --

   ----------

   overriding procedure Read

     (Port   : in out Serial_Port;

      Buffer : out Stream_Element_Array;

      Last   : out Stream_Element_Offset)

   is

      Success   : BOOL;

      Read_Last : aliased DWORD;

   begin

      if Port.H = null then

         Raise_Error ("read: port not opened", 0);

      end if;

      Success :=

        ReadFile

          (hFile                => HANDLE (Port.H.all),

           lpBuffer             => Buffer (Buffer'First)'Address,

           nNumberOfBytesToRead => DWORD (Buffer'Length),

           lpNumberOfBytesRead  => Read_Last'Access,

           lpOverlapped         => null);

      if Success = Win32.FALSE then

         Raise_Error ("read error");

      end if;

      Last := Last_Index (Buffer'First, size_t (Read_Last));

   end Read;

   ---------

   -- Set --

   ---------

   procedure Set

     (Port      : Serial_Port;

      Rate      : Data_Rate        := B9600;

      Bits      : Data_Bits        := CS8;

      Stop_Bits : Stop_Bits_Number := One;

      Parity    : Parity_Check     := None;

      Block     : Boolean          := True;

      Timeout   : Duration         := 10.0)

   is

      Success      : BOOL;

      Com_Time_Out : aliased COMMTIMEOUTS;

      Com_Settings : aliased DCB;

   begin

      if Port.H = null then

         Raise_Error ("set: port not opened", 0);

      end if;

      Success := GetCommState (HANDLE (Port.H.all), Com_Settings'Access);

      if Success = Win32.FALSE then

         Success := CloseHandle (HANDLE (Port.H.all));

         Port.H.all := 0;

         Raise_Error ("set: cannot get comm state");

      end if;

      Com_Settings.BaudRate        := DWORD (Data_Rate_Value (Rate));

      Com_Settings.fParity         := 1;

      Com_Settings.fBinary         := Bits1 (System.Win32.TRUE);

      Com_Settings.fOutxCtsFlow    := 0;

      Com_Settings.fOutxDsrFlow    := 0;

      Com_Settings.fDsrSensitivity := 0;

      Com_Settings.fDtrControl     := DTR_CONTROL_DISABLE;

      Com_Settings.fOutX           := 0;

      Com_Settings.fInX            := 0;

      Com_Settings.fRtsControl     := RTS_CONTROL_DISABLE;

      Com_Settings.fAbortOnError   := 0;

      Com_Settings.ByteSize        := BYTE (C_Bits (Bits));

      Com_Settings.Parity          := BYTE (C_Parity (Parity));

      Com_Settings.StopBits        := BYTE (C_Stop_Bits (Stop_Bits));

      Success := SetCommState (HANDLE (Port.H.all), Com_Settings'Access);

      if Success = Win32.FALSE then

         Success := CloseHandle (HANDLE (Port.H.all));

         Port.H.all := 0;

         Raise_Error ("cannot set comm state");

      end if;

      --  Set the timeout status

      if Block then

         Com_Time_Out := (others => 0);

      else

         Com_Time_Out :=

           (ReadTotalTimeoutConstant => DWORD (1000 * Timeout),

            others                   => 0);

      end if;

      Success :=

        SetCommTimeouts

          (hFile          => HANDLE (Port.H.all),

           lpCommTimeouts => Com_Time_Out'Access);

      if Success = Win32.FALSE then

         Raise_Error ("cannot set the timeout");

      end if;

   end Set;

   -----------

   -- Write --

   -----------

   overriding procedure Write

     (Port   : in out Serial_Port;

      Buffer : Stream_Element_Array)

   is

      Success   : BOOL;

      Temp_Last : aliased DWORD;

   begin

      if Port.H = null then

         Raise_Error ("write: port not opened", 0);

      end if;

      Success :=

        WriteFile

          (hFile                  => HANDLE (Port.H.all),

           lpBuffer               => Buffer'Address,

           nNumberOfBytesToWrite  => DWORD (Buffer'Length),

           lpNumberOfBytesWritten => Temp_Last'Access,

           lpOverlapped           => null);

      if Success = Win32.FALSE

        or else Stream_Element_Offset (Temp_Last) /= Buffer'Length

      then

         Raise_Error ("failed to write data");

      end if;

   end Write;

end GNAT.Serial_Communications;