Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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:
+ */