diff --git a/lib/include/vector.h b/lib/include/vector.h
new file mode 100644
index 0000000..cf2d2b9
--- /dev/null
+++ b/lib/include/vector.h
@@ -0,0 +1,41 @@
+/* vector.h
+ *
+ *   Copyright (C) 2018   Henrik Hautakoski <henrik@fiktivkod.org>
+ *
+ *   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.
+ */
+#ifndef VECTOR_H
+#define VECTOR_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+struct vector  {
+	size_t blk_sz;
+	size_t alloc;
+	size_t size;
+	void  *base;
+};
+
+#define VECTOR_INIT(block_size) { block_size, 0, 0, NULL }
+
+void vector_init(struct vector* v, size_t block_size);
+
+void vector_destory(struct vector* v);
+
+void vector_append(struct vector* v, const void *ptr, size_t n);
+
+#endif /* VECTOR_H */
diff --git a/lib/src/vector.c b/lib/src/vector.c
new file mode 100644
index 0000000..b49e020
--- /dev/null
+++ b/lib/src/vector.c
@@ -0,0 +1,54 @@
+/* vector.c
+ *
+ *   Copyright (C) 2018   Henrik Hautakoski <henrik@fiktivkod.org>
+ *
+ *   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 <string.h>
+#include <stdlib.h>
+#include <vector.h>
+
+static void ensure_size(struct vector* v, size_t n) {
+
+	size_t old_alloc = v->alloc;
+	while(v->alloc < v->size + n)
+		v->alloc += v->blk_sz;
+
+	if (old_alloc != v->alloc)
+		v->base = realloc(v->base, v->alloc);
+}
+
+void vector_init(struct vector* v, size_t block_size) {
+
+	v->blk_sz = block_size > 0 ? block_size : 64;
+	v->alloc  = 0;
+	v->size   = 0;
+	v->base   = NULL;
+}
+
+void vector_destory(struct vector *v) {
+
+	if (v->base)
+		free(v->base);
+}
+
+void vector_append(struct vector *v, const void *ptr, size_t n) {
+
+	ensure_size(v, n);
+
+	memcpy(v->base + v->size, ptr, n);
+	v->size += n;
+}