Move codecs.[ch] out of epan and into codecs directory.

This may break easy_codec plugins, but it appears a better/more consistent way is needed to register codecs.  See Guy's comments in bug 7893 (https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7893)

svn path=/trunk/; revision=53686

1 files changed, 88 insertions, 0 deletions

diff --git a/codecs/codecs.c b/codecs/codecs.c
new file mode 100644
index 0000000000..0cb397f99b
--- /dev/null
+++ b/codecs/codecs.c
@@ -0,0 +1,88 @@
+/* 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 <glib.h>
+#include "codecs.h"
+
+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. */
+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 = (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);
+}
+
+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);
+}