File : agpl-magnet.adb


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

--                         ADAGIO - ADALID - AENEA.                         --

--                                                                          --

--                            Copyright (C) 2003                            --

--                                 A. Mosteo.                               --

--                                                                          --

--  Authors: A. Mosteo. (adagio@mosteo.com)                                 --

--                                                                          --

--  If you have any questions in regard to this software, please address    --

--  them to the above email.                                                --

--                                                                          --

--  This program 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 program 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.          --

--                                                                          --

--  You are not allowed to use any part of this code to develop a program   --

--  whose output would be used to harass or prosecute other users of the    --

--  networks Adagio connects with. All data collected with Adagio or a tool --

--  containing Adagio code about other network users must remain            --

--  confidential and cannot be made public by any mean, nor be used to      --

--  harass or legally prosecute these users.                                --

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

--  $Id: agpl-http.ads,v 1.1 2004/01/21 21:05:53 Jano Exp $


with Agpl.Strings;
with Agpl.Strings.Fields;

package body Agpl.Magnet is

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

   -- Create                                                             --

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

   function Create (Url : in String) return Object is
   begin
      return (Url => U (Url));
   end Create;

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

   -- Get_Attribute                                                      --

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

   -- Get any attribute of the magnet:

   function Get_Attribute (This : in Object; Attr : in String) return String is
      Url   : String  := S (This.Url);
      Start : Natural := Strings.Pos (Url, Attr & "=");
      Fin   : Natural;
   begin
      if Start = 0 then
         return "";
      elsif Url (Start - 1) /= '?' and then Url (Start - 1) /= '&' then
         return "";
      else
         Fin := Strings.Pos (Url, "&", Start + Attr'Length + 1);
         if Fin = 0 then
            return Url (Start + Attr'Length + 1 .. Url'Last);
         else
            return Url (Start + Attr'Length + 1 .. Fin - 1);
         end if;
      end if;
   end Get_Attribute;

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

   -- Get_Hash_Type                                                      --

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

   function Get_Hash_Type (This : in Object) return String is
      Hash : constant String := Get_Attribute (This, "xt");
   begin
      return Strings.Fields.Select_Field (Hash, 2, ':');
   end Get_Hash_Type;

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

   -- Get_Hash_Value                                                     --

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

   function Get_Hash_Value (This : in Object) return String is
      Hash : constant String := Get_Attribute (This, "xt");
   begin
      return Strings.Fields.Select_Field (Hash, 3, ':');
   end Get_Hash_Value;

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

   -- Get_Name                                                           --

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

   function Get_Name (This : in Object) return String is
   begin
      return Get_Attribute (This, "dn");
   end Get_Name;

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

   -- Is_Magnet                                                          --

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

   -- Says if a string is a Magnet link

   function Is_Magnet (This : in String) return Boolean is
   begin
      return This'Length >= 8 and then This (This'First .. This'First + 7) = "magnet:?";
   end Is_Magnet;

end Agpl.Magnet;