Test for offsets

diff --git a/tests/60_simple_offset.ml b/tests/60_simple_offset.ml
new file mode 100644 (file)
index 0000000..556fd86
--- /dev/null
+++ b/tests/60_simple_offset.ml
@@ -0,0 +1,35 @@
+(* Simple offset test
+ * $Id: 50_named_pattern.ml 86 2008-06-13 15:56:04Z richard.wm.jones $
+ *)
+
+open Printf
+open Bitmatch
+
+let make_bits i n j m k = (
+  let pad1 = ones_bitstring (n-8) in
+  let pad2 = ones_bitstring (m-n-8) in
+  BITSTRING {
+    i : 8;
+    pad1 : n-8 : bitstring;
+    j : 8;                          (* this should be at offset(n) *)
+    pad2 : m-n-8 : bitstring;
+    k : 8                           (* this should be at offset(m) *)
+  }
+)
+
+let test_bits bits i n j m k =
+  bitmatch bits with
+  | { i' : 8;
+      j' : 8 : offset(n);
+      k' : 8 : offset(m) } when i = i' && j = j' && k = k' -> () (* ok *)
+  | { _ } ->
+      failwith (sprintf "60_simple_offset: test_bits: failed %d %d %d %d %d"
+                 i n j m k)
+
+let () =
+  for n = 8 to 128 do
+    for m = n+8 to 256 do
+      List.iter (fun (i,j,k) -> test_bits (make_bits i n j m k) i n j m k)
+       [0x55, 0xaa, 0x33; 0x33, 0xaa, 0x55; 0x12, 0x34, 0x56]
+    done;
+  done