------------------------------------------------------------------------------
--                              Ada Web Server                              --
--                                                                          --
--                     Copyright (C) 2000-2012, AdaCore                     --
--                                                                          --
--  This library is free software;  you can redistribute it and/or modify   --
--  it under terms of the  GNU General Public License  as published by the  --
--  Free Software  Foundation;  either version 3,  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.                    --
--                                                                          --
--  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/>.                                         --
--                                                                          --
--  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.                                     --
------------------------------------------------------------------------------

with AWS.Containers.Tables;
with AWS.Net;

package AWS.Headers is

   type List is new AWS.Containers.Tables.Table_Type with private;
   --  Header container. This set handles a set of HTTP header line, each new
   --  header line is inserted at the end of the list (see AWS.Headers.Set API)
   --  and can be retrieved by the following services. Header lines are
   --  numbered from 1 to N.

   Empty_List : constant List;

   subtype VString_Array is AWS.Containers.Tables.VString_Array;

   subtype Element is AWS.Containers.Tables.Element;

   Format_Error : exception;
   --  Raised when header line format is wrong

   procedure Send_Header
     (Socket : Net.Socket_Type'Class; Headers : List);
   --  Send all header lines in Headers list to the socket

   function Get_Line (Headers : List; N : Positive) return String;
   --  Returns the Nth header line in Headers container. The returned value is
   --  formatted as a correct header line:
   --
   --     message-header = field-name ":" [ field-value ]
   --
   --  That is the header-name followed with character ':' and the header
   --  values. If there is less than Nth header line it returns the empty
   --  string. Note that this routine does returns all header line values, for
   --  example it would return:
   --
   --     Content_Type: multipart/mixed; boundary="0123_The_Boundary_Value_"
   --
   --  For a file upload content type header style.

   function Get_Values (Headers : List; Name : String) return String;
   --  Returns all values for the specified header field Name in a
   --  comma-separated string. This format is conformant to [RFC 2616 - 4.2]
   --  (see last paragraph).

   function Length (Headers : AWS.Headers.List) return Natural;
   --  Returns the length (in bytes) of the header, including the ending
   --  empty line.

   --  See AWS.Containers.Tables for inherited routines

private

   type List is new AWS.Containers.Tables.Table_Type with null record;

   Empty_List : constant List :=
                  (AWS.Containers.Tables.Empty_Table with null record);

end AWS.Headers;
