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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:34:10 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:34:10 +0000
commite4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc (patch)
tree68cb5ef9081156392f1dd62a00c6ccc1451b93df /wsutil/codecs.c
parentInitial commit. (diff)
downloadwireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.tar.xz
wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.zip
Adding upstream version 4.2.2.upstream/4.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'wsutil/codecs.c')
-rw-r--r--wsutil/codecs.c194
1 files changed, 194 insertions, 0 deletions
diff --git a/wsutil/codecs.c b/wsutil/codecs.c
new file mode 100644
index 00000000..857cd33b
--- /dev/null
+++ b/wsutil/codecs.c
@@ -0,0 +1,194 @@
+/* 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 "codecs.h"
+
+#include <wsutil/wslog.h>
+#ifdef HAVE_PLUGINS
+#include <wsutil/plugins.h>
+#endif
+
+#ifdef HAVE_PLUGINS
+static plugins_t *libwscodecs_plugins = NULL;
+#endif
+
+static GSList *codecs_plugins = NULL;
+
+#ifdef HAVE_PLUGINS
+void
+codecs_register_plugin(const codecs_plugin *plug)
+{
+ codecs_plugins = g_slist_prepend(codecs_plugins, (codecs_plugin *)plug);
+}
+#else /* HAVE_PLUGINS */
+void
+codecs_register_plugin(const codecs_plugin *plug _U_)
+{
+ ws_warning("codecs_register_plugin: built without support for binary plugins");
+}
+#endif /* HAVE_PLUGINS */
+
+static void
+call_plugin_register_codec_module(void * data, void * user_data _U_)
+{
+ codecs_plugin *plug = (codecs_plugin *)data;
+
+ if (plug->register_codec_module) {
+ plug->register_codec_module();
+ }
+}
+
+
+/*
+ * For all codec plugins, call their register routines.
+ */
+void
+codecs_init(void)
+{
+#ifdef HAVE_PLUGINS
+ libwscodecs_plugins = plugins_init(WS_PLUGIN_CODEC);
+#endif
+ g_slist_foreach(codecs_plugins, call_plugin_register_codec_module, NULL);
+}
+
+void
+codecs_cleanup(void)
+{
+ g_slist_free(codecs_plugins);
+ codecs_plugins = NULL;
+#ifdef HAVE_PLUGINS
+ 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)
+{
+ codec_handle_t ret;
+ char *key = g_ascii_strup(name, -1);
+
+ ret = (registered_codecs) ? (codec_handle_t)g_hash_table_lookup(registered_codecs, key) : NULL;
+ g_free(key);
+ return ret;
+}
+
+/* Register a codec by name. */
+bool
+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;
+ char *key;
+
+ /* Create our hash table if it doesn't already exist */
+ if (registered_codecs == NULL)
+ registered_codecs = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
+
+ /* RFC 4855 3. Mapping to SDP Parameters "Note that the payload format
+ * (encoding) names... are commonly shown in upper case. These names
+ * are case-insensitive in both places."
+ */
+ key = g_ascii_strup(name, -1);
+
+ /* Make sure the registration is unique */
+ if (g_hash_table_lookup(registered_codecs, key) != NULL) {
+ g_free(key);
+ return false; /* report an error, or have our caller do it? */
+ }
+
+ handle = g_new(struct codec_handle, 1);
+ 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, (void *)key, (void *) handle);
+ return true;
+}
+
+/* Deregister a codec by name. */
+bool
+deregister_codec(const char *name)
+{
+ bool ret = false;
+ if (registered_codecs) {
+ char *key = g_ascii_strup(name, -1);
+
+ ret = g_hash_table_remove(registered_codecs, key);
+ g_free(key);
+ }
+ return ret;
+}
+
+void *codec_init(codec_handle_t codec, codec_context_t *context)
+{
+ if (!codec) return NULL;
+ return (codec->init_fn)(context);
+}
+
+void codec_release(codec_handle_t codec, codec_context_t *context)
+{
+ if (!codec) return;
+ (codec->release_fn)(context);
+}
+
+unsigned codec_get_channels(codec_handle_t codec, codec_context_t *context)
+{
+ if (!codec) return 0;
+ return (codec->channels_fn)(context);
+}
+
+unsigned codec_get_frequency(codec_handle_t codec, codec_context_t *context)
+{
+ if (!codec) return 0;
+ return (codec->frequency_fn)(context);
+}
+
+size_t codec_decode(codec_handle_t codec, codec_context_t *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:
+ */