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hexentry.cc

/*
    Copyright (C) 2000 Paul Barton-Davis 

    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 program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: hexentry.cc,v 1.3 2002/06/01 03:32:49 trutkin Exp $
*/

#include <stdio.h> /* for sprintf, sigh ... */
#include <string>
#include <ctype.h>

#include <gdk/gdkkeysyms.h>
#include <gtkmmext/hexentry.h>

using namespace std;
using namespace Gtkmmext;

gint
HexEntry::key_press_event_impl (GdkEventKey *ev)

{
      if ((ev->keyval >= GDK_a && ev->keyval <= GDK_f) ||
          (ev->keyval >= GDK_A && ev->keyval <= GDK_A) ||
          (ev->keyval >= GDK_0 && ev->keyval <= GDK_9) ||
          ev->keyval == GDK_space || 
          ev->keyval == GDK_Tab ||
          ev->keyval == GDK_Return ||
          ev->keyval == GDK_BackSpace ||
          ev->keyval == GDK_Delete) {
            return Gtk::Entry::key_press_event_impl (ev);
      } else {
            gdk_beep ();
            return FALSE;
      }
}


void
HexEntry::set_hex (unsigned char *msg, unsigned int len) 
      
{
      /* create a textual representation of the MIDI message */
      
      if (msg && len) {
            char *rep;
            
            rep = new char[(len * 3) + 1];
            for (size_t i = 0; i < len; i++) {
                  sprintf (&rep[i*3], "%02x ", msg[i]);
            }
            rep[len * 3] = '\0';
            set_text (rep);
            delete [] rep;
      } else {
            set_text ("");
      }
}

unsigned int
HexEntry::get_hex (unsigned char *hexbuf, size_t buflen)

{
      int fetched_len;
      char buf[3];
      string text = get_text();
      string::size_type length = text.length ();
      string::size_type offset;

      fetched_len = 0;
      buf[2] = '\0';
      offset = 0;

      while (1) {
            offset = text.find_first_of ("abcdef0123456789", offset);

            if (offset == string::npos) {
                  break;
            }

            /* grab two characters, but no more */
            
            buf[0] = text[offset];

            if (offset < length - 1) {
                  buf[1] = text[offset+1];
                  offset += 2;
            } else {
                  buf[1] = '\0';
                  offset += 1;
            }

            hexbuf[fetched_len++] = (char) strtol (buf, 0, 16);
      }

      return fetched_len;
}



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