File : aws-headers-set.adb


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

--                              Ada Web Server                              --

--                                                                          --

--                         Copyright (C) 2000-2003                          --

--                                ACT-Europe                                --

--                                                                          --

--  Authors: Dmitriy Anisimkov - Pascal Obry                                --

--                                                                          --

--  This library is free software; you can redistribute it and/or modify    --

--  it under the terms of the GNU General Public License as published by    --

--  the Free Software Foundation; either version 2 of the License, or (at   --

--  your option) any later version.                                         --

--                                                                          --

--  This library is distributed in the hope that it will be useful, but     --

--  WITHOUT ANY WARRANTY; without even the implied warranty of              --

--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       --

--  General Public License for more details.                                --

--                                                                          --

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

--  along with this library; if not, write to the Free Software Foundation, --

--  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.          --

--                                                                          --

--  As a special exception, if other files instantiate generics from this   --

--  unit, or you link this unit with other files to produce an executable,  --

--  this  unit  does not  by itself cause  the resulting executable to be   --

--  covered by the GNU General Public License. This exception does not      --

--  however invalidate any other reasons why the executable file  might be  --

--  covered by the  GNU Public License.                                     --

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


--  $Id: aws-headers-set.adb,v 1.1 2003/10/05 19:59:54 Jano Exp $


with Ada.Strings.Fixed;
with Ada.Text_IO;

with AWS.Containers.Tables.Set;
with AWS.Net.Buffered;

package body AWS.Headers.Set is

   use AWS.Containers;

   subtype P_List is Tables.Table_Type;

   Debug_Flag : Boolean := False;
   --  Set to True to output debug information to the standard output.


   ---------

   -- Add --

   ---------


   procedure Add (Headers : in out List; Name, Value : in String) is
   begin
      Tables.Set.Add (P_List (Headers), Name, Value);
   end Add;

   -----------

   -- Debug --

   -----------


   procedure Debug (Activate : in Boolean) is
   begin
      Debug_Flag := Activate;
   end Debug;

   ----------

   -- Free --

   ----------


   procedure Free (Headers : in out List) is
   begin
      Tables.Set.Free (P_List (Headers));
   end Free;

   ----------

   -- Read --

   ----------


   procedure Read (Socket : in Net.Socket_Type'Class; Headers : in out List) is

      procedure Parse_Header_Lines (Line : in String);
      --  Parse the Line eventually catenated with the next line if it is a

      --  continuation line see [RFC 2616 - 4.2].


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

      -- Parse_Header_Lines --

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


      procedure Parse_Header_Lines (Line : in String) is
         End_Of_Message : constant String := "";
      begin
         if Line = End_Of_Message then
            return;

         else
            declare
               use Ada.Strings;

               Next_Line       : constant String
                 := Net.Buffered.Get_Line (Socket);
               Delimiter_Index : Natural;

            begin
               if Next_Line /= End_Of_Message
                    and then
                 (Next_Line (1) = ' ' or else Next_Line (1) = ASCII.HT)
               then
                  --  Continuing value on the next line. Header fields can be

                  --  extended over multiple lines by preceding each extra

                  --  line with at least one SP or HT.

                  Parse_Header_Lines (Line & Next_Line);

               else
                  if Debug_Flag then
                     Ada.Text_IO.Put_Line ('>' & Line);
                  end if;

                  --  Put name and value to the container separately.


                  Delimiter_Index := Fixed.Index (Line, ":");

                  if Delimiter_Index = 0 then
                     --  No delimiter, this is not a valid Header Line

                     raise Format_Error;
                  end if;

                  Add (Headers,
                       Name  => Line (Line'First .. Delimiter_Index - 1),
                       Value => Fixed.Trim
                                  (Line (Delimiter_Index + 1 .. Line'Last),
                                   Side => Both));

                  --  Parse next header line.


                  Parse_Header_Lines (Next_Line);
               end if;
            end;
         end if;
      end Parse_Header_Lines;

   begin
      Reset (Headers);
      Parse_Header_Lines (Net.Buffered.Get_Line (Socket));
   end Read;

   -----------

   -- Reset --

   -----------


   procedure Reset (Headers : in out List) is
   begin
      Tables.Set.Reset (P_List (Headers));
      Tables.Set.Case_Sensitive (P_List (Headers), False);
   end Reset;

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

   -- Update --

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


   procedure Update
     (Headers : in out List;
      Name    : in     String;
      Value   : in     String;
      N       : in     Positive := 1) is
   begin
      Tables.Set.Update (P_List (Headers), Name, Value, N);
   end Update;

end AWS.Headers.Set;