mdw@git.distorted.org.uk Git - mLib/blob - codec/null-codec.c

   1 /* -*-c-*-
   2  *
   3  * Null codec implementation
   4  *
   5  * (c) 2009 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the mLib utilities library.
  11  *
  12  * mLib is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * mLib is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with mLib; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 /*----- Header files ------------------------------------------------------*/
  29
  30 #include <string.h>
  31
  32 #include "codec.h"
  33 #include "sub.h"
  34
  35 /*----- Data structures ---------------------------------------------------*/
  36
  37 typedef struct null_codec {
  38   codec c;
  39 } null_codec;
  40
  41 /*----- Main code ---------------------------------------------------------*/
  42
  43 static int encdec(codec *c, const void *p, size_t sz, dstr *d)
  44   { DPUTM(d, p, sz); return (0); }
  45
  46 static void destroy(codec *c)
  47   { null_codec *nc = (null_codec *)c; DESTROY(nc); }
  48
  49 static const codec_ops ops = { &null_codec_class, encdec, destroy };
  50
  51 static codec *encoder(unsigned flags, const char *indent, unsigned maxlen)
  52 {
  53   null_codec *nc = CREATE(null_codec);
  54   nc->c.ops = &ops;
  55   return (&nc->c);
  56 }
  57
  58 static codec *decoder(unsigned flags)
  59 {
  60   null_codec *nc = CREATE(null_codec);
  61   nc->c.ops = &ops;
  62   return (&nc->c);
  63 }
  64
  65 const codec_class null_codec_class = { "null", encoder, decoder };
  66
  67 /*----- That's all, folks -------------------------------------------------*/