Added string offset tests.

diff --git a/tests/61_offset_string.ml b/tests/61_offset_string.ml
new file mode 100644 (file)
index 0000000..556e028
--- /dev/null
+++ b/tests/61_offset_string.ml
@@ -0,0 +1,40 @@
+(* Offset string.  The rotation functions used for strings are
+ * very complicated so this is worth testing separately.
+ * $Id: 50_named_pattern.ml 86 2008-06-13 15:56:04Z richard.wm.jones $
+ *)
+
+open Printf
+open Bitmatch
+
+let make_bits si n sj m sk = (
+  let pad1 = ones_bitstring (n-64) in
+  let pad2 = ones_bitstring (m-n-8) in
+  BITSTRING {
+    si : 64 : string;
+    pad1 : n-64 : bitstring;
+    sj : 8 : string;                (* this should be at offset(n) *)
+    pad2 : m-n-8 : bitstring;
+    sk : 64 : string                (* this should be at offset(m) *)
+  }
+)
+
+let test_bits bits si n sj m sk =
+  bitmatch bits with
+  | { si' : 64 : string;
+      sj' : 8 : string, offset(n);
+      sk' : 64 : string, offset(m) }
+      when si = si' && sj = sj' && sk = sk' -> () (* ok *)
+  | { _ } ->
+      failwith (sprintf "61_offset_string: test_bits: failed %S %d %S %d %S"
+                 si n sj m sk)
+
+let () =
+  for n = 64 to 128 do
+    for m = n+8 to 256 do
+      List.iter (fun (si,sj,sk) ->
+                  test_bits (make_bits si n sj m sk) si n sj m sk)
+       ["ABCDEFGH", "x", "HGFEDCBA";
+        "01234567", "0", "76543210";
+        "abcdefgh", "\x55", "poiuytre"]
+    done;
+  done