s4/drsuapi: Internal implementation for ber_read_OID_String

[samba.git] / lib / util / asn1.c

diff --git a/lib/util/asn1.c b/lib/util/asn1.c
index 61fb9555a77624f1a54aac275c9f21c8d0e62c8b..0d08027a070c914126c1bdb83aa5e67cd6533ccc 100644 (file)
--- a/lib/util/asn1.c
+++ b/lib/util/asn1.c
@@ -578,6 +578,46 @@ int asn1_tag_remaining(struct asn1_data *data)
        return remaining;
 }
 
+/**
+ * Internal implementation for reading binary OIDs
+ * Reading is done as far in the buffer as valid OID
+ * till buffer ends or not valid sub-identifier is found.
+ */
+static bool _ber_read_OID_String_impl(TALLOC_CTX *mem_ctx, DATA_BLOB blob,
+                                       const char **OID, size_t *bytes_eaten)
+{
+       int i;
+       uint8_t *b;
+       uint_t v;
+       char *tmp_oid = NULL;
+
+       if (blob.length < 2) return false;
+
+       b = blob.data;
+
+       tmp_oid = talloc_asprintf(mem_ctx, "%u",  b[0]/40);
+       if (!tmp_oid) goto nomem;
+       tmp_oid = talloc_asprintf_append_buffer(tmp_oid, ".%u",  b[0]%40);
+       if (!tmp_oid) goto nomem;
+
+       for(i = 1, v = 0; i < blob.length; i++) {
+               v = (v<<7) | (b[i]&0x7f);
+               if ( ! (b[i] & 0x80)) {
+                       tmp_oid = talloc_asprintf_append_buffer(tmp_oid, ".%u",  v);
+                       v = 0;
+                       if (bytes_eaten)
+                               *bytes_eaten = i+1;
+               }
+               if (!tmp_oid) goto nomem;
+       }
+
+       *OID = tmp_oid;
+       return true;
+
+nomem:
+       return false;
+}
+
 /* read an object ID from a data blob */
 bool ber_read_OID_String(TALLOC_CTX *mem_ctx, DATA_BLOB blob, const char **OID)
 {