Added offset padding test to test the case when original_off <> 0.

diff --git a/tests/62_offset_padding.ml b/tests/62_offset_padding.ml
new file mode 100644 (file)
index 0000000..46ed300
--- /dev/null
+++ b/tests/62_offset_padding.ml
@@ -0,0 +1,42 @@
+(* Test computed offsets when original_off <> 0.
+ * $Id$
+ *)
+
+open Printf
+open Bitmatch
+
+let make_bits p i n j m k = (
+  let pad0 = ones_bitstring p in
+  let pad1 = ones_bitstring (n-8) in
+  let pad2 = ones_bitstring (m-n-8) in
+  BITSTRING {
+    pad0 : p : bitstring;           (* will be skipped below *)
+    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 p i n j m k =
+  (* Skip the 'p' padding bits so the match starts at a non-zero offset. *)
+  let bits = dropbits p bits in
+
+  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 p = 1 to 4 do
+    for n = 8 to 128 do
+      for m = n+8 to 256 do
+       List.iter (fun (i,j,k) -> test_bits (make_bits p i n j m k) p i n j m k)
+         [0x55, 0xaa, 0x33; 0x33, 0xaa, 0x55; 0x12, 0x34, 0x56]
+      done;
+    done;
+  done