new venti library.
diff --git a/src/libventi/dtype.c b/src/libventi/dtype.c
new file mode 100644
index 0000000..0151ba2
--- /dev/null
+++ b/src/libventi/dtype.c
@@ -0,0 +1,78 @@
+#include <u.h>
+#include <libc.h>
+#include <venti.h>
+
+enum {
+ OVtErrType, /* illegal */
+
+ OVtRootType,
+ OVtDirType,
+ OVtPointerType0,
+ OVtPointerType1,
+ OVtPointerType2,
+ OVtPointerType3,
+ OVtPointerType4,
+ OVtPointerType5,
+ OVtPointerType6,
+ OVtPointerType7, /* not used */
+ OVtPointerType8, /* not used */
+ OVtPointerType9, /* not used */
+ OVtDataType,
+
+ OVtMaxType
+};
+
+
+uint todisk[] = {
+ OVtDataType,
+ OVtPointerType0,
+ OVtPointerType1,
+ OVtPointerType2,
+ OVtPointerType3,
+ OVtPointerType4,
+ OVtPointerType5,
+ OVtPointerType6,
+ OVtDirType,
+ OVtPointerType0,
+ OVtPointerType1,
+ OVtPointerType2,
+ OVtPointerType3,
+ OVtPointerType4,
+ OVtPointerType5,
+ OVtPointerType6,
+ OVtRootType,
+};
+
+uint fromdisk[] = {
+ ~0,
+ VtRootType,
+ VtDirType,
+ VtDirType+1,
+ VtDirType+2,
+ VtDirType+3,
+ VtDirType+4,
+ VtDirType+5,
+ VtDirType+6,
+ VtDirType+7,
+ ~0,
+ ~0,
+ ~0,
+ VtDataType,
+};
+
+uint
+vttodisktype(uint n)
+{
+ if(n >= nelem(todisk))
+ return ~0;
+ return todisk[n];
+}
+
+uint
+vtfromdisktype(uint n)
+{
+ if(n >= nelem(fromdisk))
+ return ~0;
+ return fromdisk[n];
+}
+
