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/* codecs.c
* codecs interface 2007 Tomas Kukosa
*
* $Id$
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <glib.h>
#include "codecs.h"
#ifdef HAVE_PLUGINS
#include <gmodule.h>
#include <wsutil/plugins.h>
/*
* List of codec plugins.
*/
typedef struct {
void (*register_codec_module)(void); /* routine to call to register a codec */
} codec_plugin;
static GSList *codec_plugins = NULL;
/*
* Callback for each plugin found.
*/
static gboolean
check_for_codec_plugin(GModule *handle)
{
gpointer gp;
void (*register_codec_module)(void);
codec_plugin *plugin;
/*
* Do we have a register_codec_module routine?
*/
if (!g_module_symbol(handle, "register_codec_module", &gp)) {
/* No, so this isn't a codec plugin. */
return FALSE;
}
/*
* Yes - this plugin includes one or more codecs.
*/
register_codec_module = (void (*)(void))gp;
/*
* Add this one to the list of codec plugins.
*/
plugin = (codec_plugin *)g_malloc(sizeof (codec_plugin));
plugin->register_codec_module = register_codec_module;
codec_plugins = g_slist_append(codec_plugins, plugin);
return TRUE;
}
void
codec_register_plugin_types(void)
{
add_plugin_type("codec", check_for_codec_plugin);
}
static void
register_codec_plugin(gpointer data, gpointer user_data _U_)
{
codec_plugin *plugin = (codec_plugin *)data;
(plugin->register_codec_module)();
}
/*
* For all codec plugins, call their register routines.
*/
void
register_all_codecs(void)
{
g_slist_foreach(codec_plugins, register_codec_plugin, NULL);
}
#endif /* HAVE_PLUGINS */
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) ? (codec_handle_t)g_hash_table_lookup(registered_codecs, name) : NULL;
}
/* Register a codec by name. */
gboolean
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);
/* Make sure the registration is unique */
if (g_hash_table_lookup(registered_codecs, name) != NULL)
return FALSE; /* report an error, or have our caller do it? */
handle = (struct codec_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);
return TRUE;
}
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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