1 files changed, 26 insertions, 0 deletions
diff --git a/sid.ml b/sid.ml
index 12d708a..0d5c89b 100644
--- a/sid.ml
+++ b/sid.ml
@@ -221,6 +221,32 @@ module PacketRep = struct (* [MS-DTYP] 2.4.22 *)
        ; sid_sub_auths  = sas
        }
 
+  let from_channel ?(endian=Little) ic =
+    try
+      let v = input_byte ic in
+      if v <> 0x01 then
+        Error (Printf.sprintf
+                 "input malformed: expected SID version=0x01, got 0x%0.2x" v) else
+      let nsa = input_byte ic in
+      if max_subauth_count < nsa then
+        Error (Printf.sprintf
+                 "input malformed: up to %d subAuthority elements permitted, \
+                  %d specified"
+                 max_subauth_count nsa) else
+      let n = sizeof_ident_auth + nsa * sizeof_sub_auth in
+      let b = Bytes.make (2 + n) '\x00' in
+      Bytes.set b 0 '\x01';
+      Bytes.set b 1 (char_of_int nsa);
+      really_input ic b 2 n;
+      decode ~endian b
+    with End_of_file ->
+      Error (Printf.sprintf
+               "input malformed: unexpected end of file at offset %d \
+                parsing SID" (pos_in ic))
+
+  let to_channel ?(endian=Little) oc s =
+    encode ~endian s |> output_bytes oc
+
 end (* [module PacketRep] *)
 
 module WellKnown = struct