diff --git a/include/Makefile.am b/include/Makefile.am
index 54d71c1..90681df 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -4,6 +4,7 @@ nobase_include_HEADERS = trbase.h \
 			 tr/interface.h \
 			 tr/memory.h \
 			 tr/logger.h \
+			 tr/sized_data.h \
 			 tr/tree_macros.h \
 			 tr/interface/class.h \
 			 tr/interface/indexable.h \
diff --git a/include/tr/class.h b/include/tr/class.h
index f656da9..67912f1 100644
--- a/include/tr/class.h
+++ b/include/tr/class.h
@@ -75,6 +75,16 @@
 
 #define TR_CLASSVARS_DECL(name)		struct c_##name##_vars
 #define TR_CLASSVARS(name, class)	((struct c_##name##_vars *)(class)->vars)
+#define TR_CLASSVARS_BY_NAME(name) \
+	((struct c_##name##_vars *)(TR_CLASS_BY_NAME(name))->vars)
+#define TR_CLASSVARS_STATIC(name) \
+	((struct c_##name##_vars *)(TR_CLASS_BY_NAME_STATIC(name))->vars)
+
+#define TR_INHERIT_CLASSVARS(dest, src) \
+	memcpy(&c_##dest##_vars,            \
+			TR_CLASSVARS_BY_NAME(src),  \
+			sizeof(TR_CLASSVAR_DECL(src)))
+
 
 /**
  * Make the new class a child of an existing class.
diff --git a/include/tr/sized_data.h b/include/tr/sized_data.h
new file mode 100644
index 0000000..e0ee0ba
--- /dev/null
+++ b/include/tr/sized_data.h
@@ -0,0 +1,42 @@
+/**
+ * \file
+ * Combines a char * with size_t to get a generic data structure.
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2014 Georg Hopp
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __TR_SIZED_DATA_H__
+#define __TR_SIZED_DATA_H__
+
+#include <sys/types.h>
+
+#include "trbase.h"
+
+TR_CLASS(TR_SizedData) {
+	char   * data;
+	size_t   size;
+};
+TR_INSTANCE_INIT(TR_SizedData);
+TR_CLASSVARS_DECL(TR_SizedData) {};
+
+void TR_sizedDataSetData(TR_SizedData, const char *, size_t);
+
+#endif // __TR_SIZED_DATA_H__
+
+// vim: set ts=4 sw=4:
diff --git a/include/trbase.h b/include/trbase.h
index 2eb0fee..42d41d0 100644
--- a/include/trbase.h
+++ b/include/trbase.h
@@ -5,6 +5,7 @@
 #include "tr/memory.h"
 #include "tr/class.h"
 #include "tr/logger.h"
+#include "tr/sized_data.h"
 #include "tr/interface.h"
 #include "tr/interface/class.h"
 #include "tr/interface/subject.h"
diff --git a/src/Makefile.am b/src/Makefile.am
index 2cf64ac..5b06a78 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -8,6 +8,8 @@ TR_CLASS = memory.c \
 	   logger.c \
 	   stderr.c \
 	   syslog.c \
+	   sized_data.c \
+	   sized_data_set_data.c \
 	   i_class.c \
 	   i_subject.c \
 	   i_observer.c \
diff --git a/src/sized_data.c b/src/sized_data.c
new file mode 100644
index 0000000..7100969
--- /dev/null
+++ b/src/sized_data.c
@@ -0,0 +1,58 @@
+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2014 Georg Hopp
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdarg.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "trbase.h"
+
+#include "tr/sized_data.h"
+
+static
+int
+sizedDataCtor(void * _this, va_list * params)
+{
+	TR_SizedData this   = _this;
+	char         * data = va_arg(*params, char *);
+
+	this->size = va_arg(*params, size_t);
+
+	if (data != NULL) {
+		this->data = TR_malloc(this->size);
+		memcpy(this->data, data, this->size);
+	}
+
+	return 0;
+}
+
+static
+void
+sizedDataDtor(void * _this)
+{
+	TR_MEM_FREE(((TR_SizedData)_this)->data);
+}
+
+TR_INIT_IFACE(TR_Class, sizedDataCtor, sizedDataDtor, NULL);
+TR_CREATE_CLASS(TR_SizedData, NULL, NULL, TR_IF(TR_Class));
+
+// vim: set ts=4 sw=4:
diff --git a/src/sized_data_set_data.c b/src/sized_data_set_data.c
new file mode 100644
index 0000000..e628651
--- /dev/null
+++ b/src/sized_data_set_data.c
@@ -0,0 +1,45 @@
+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2014 Georg Hopp
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string.h>     // for atoi() and exit()
+#include <errno.h>      // for errno
+#include <stdio.h>
+#include <unistd.h>
+
+#include "tr/sized_data.h"
+
+void
+TR_sizedDataSetData(TR_SizedData this, const char * data, size_t size)
+{
+	if (this->data && TR_getSize(this->data) < size) {
+		TR_MEM_FREE(this->data);
+	}
+
+	if (! this->data) {
+		this->data = TR_malloc(size);
+	}
+
+	this->size = size;
+	memcpy(this->data, data, size);
+}
+
+// vim: set ts=4 sw=4: