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/* codecs.c
* codecs interface 2007 Tomas Kukosa
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <glib.h>
#include "codecs.h"
#ifdef HAVE_PLUGINS
static plugins_t *libwscodecs_plugins;
static GSList *codecs_plugins = NULL;
void
codecs_register_plugin(const codecs_plugin *plug)
{
codecs_plugins = g_slist_prepend(codecs_plugins, (codecs_plugin *)plug);
}
static void
call_plugin_register_codec_module(gpointer data, gpointer user_data _U_)
{
codecs_plugin *plug = (codecs_plugin *)data;
if (plug->register_codec_module) {
plug->register_codec_module();
}
}
#endif /* HAVE_PLUGINS */
/*
* For all codec plugins, call their register routines.
*/
void
codecs_init(void)
{
#ifdef HAVE_PLUGINS
libwscodecs_plugins = plugins_init(WS_PLUGIN_CODEC);
g_slist_foreach(codecs_plugins, call_plugin_register_codec_module, NULL);
#endif /* HAVE_PLUGINS */
}
void
codecs_cleanup(void)
{
#ifdef HAVE_PLUGINS
g_slist_free(codecs_plugins);
codecs_plugins = NULL;
plugins_cleanup(libwscodecs_plugins);
libwscodecs_plugins = NULL;
#endif
}
struct codec_handle {
const char *name;
codec_init_fn init_fn;
codec_release_fn release_fn;
codec_get_channels_fn channels_fn;
codec_get_frequency_fn frequency_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_get_channels_fn channels_fn, codec_get_frequency_fn frequency_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->channels_fn = channels_fn;
handle->frequency_fn = frequency_fn;
handle->decode_fn = decode_fn;
g_hash_table_insert(registered_codecs, (gpointer)name, (gpointer) handle);
return TRUE;
}
/* Deregister a codec by name. */
gboolean
deregister_codec(const char *name)
{
gpointer key, value;
if (registered_codecs && g_hash_table_lookup_extended(registered_codecs, name, &key, &value)) {
g_hash_table_remove(registered_codecs, name);
g_free(value);
return TRUE;
}
return FALSE;
}
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);
}
unsigned codec_get_channels(codec_handle_t codec, void *context)
{
if (!codec) return 0;
return (codec->channels_fn)(context);
}
unsigned codec_get_frequency(codec_handle_t codec, void *context)
{
if (!codec) return 0;
return (codec->frequency_fn)(context);
}
size_t codec_decode(codec_handle_t codec, void *context, const void *input, size_t inputSizeBytes, void *output, size_t *outputSizeBytes)
{
if (!codec) return 0;
return (codec->decode_fn)(context, input, inputSizeBytes, output, outputSizeBytes);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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