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codecs.c

/* codecs.c
 * codecs interface   2007 Tomas Kukosa
 *
 * $Id: codecs.c 23270 2007-10-25 09:38:15Z kukosa $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 * 
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <epan/codecs.h>

00031 struct codec_handle {
      const char *name;
      codec_init_fn init_fn;
      codec_release_fn release_fn;
      codec_decode_fn decode_fn;
};

/*
 * List of registered codecs.
 */
static GHashTable *registered_codecs = NULL;


/* Find a registered codec by name. */
codec_handle_t
find_codec(const char *name)
{
      return (registered_codecs) ? g_hash_table_lookup(registered_codecs, name) : NULL;
}

/* Register a codec by name. */
void
register_codec(const char *name, codec_init_fn init_fn, codec_release_fn release_fn, codec_decode_fn decode_fn)
{
      struct codec_handle *handle;

      /* Create our hash table if it doesn't already exist */
      if (registered_codecs == NULL) {
            registered_codecs = g_hash_table_new(g_str_hash, g_str_equal);
            g_assert(registered_codecs != NULL);
      }

      /* Make sure the registration is unique */
      g_assert(g_hash_table_lookup(registered_codecs, name) == NULL);

      handle = g_malloc(sizeof (struct codec_handle));
      handle->name = name;
      handle->init_fn = init_fn;
      handle->release_fn = release_fn;
      handle->decode_fn = decode_fn;

      g_hash_table_insert(registered_codecs, (gpointer)name, (gpointer) handle);
}

void *codec_init(codec_handle_t codec)
{
      if (!codec) return NULL;
      return (codec->init_fn)();
}

void codec_release(codec_handle_t codec, void *context)
{
      if (!codec) return;
      (codec->release_fn)(context);
}

int codec_decode(codec_handle_t codec, void *context, const void *input, int inputSizeBytes, void *output, int *outputSizeBytes)
{
      if (!codec) return 0;
      return (codec->decode_fn)(context, input, inputSizeBytes, output, outputSizeBytes);
}

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