signatures.rb in hexapdf-0.24.0

- old
+ new

@@ -2,11 +2,11 @@
 #
 #--
 # This file is part of HexaPDF.
 #
 # HexaPDF - A Versatile PDF Creation and Manipulation Library For Ruby
-# Copyright (C) 2014-2021 Thomas Leitner
+# Copyright (C) 2014-2022 Thomas Leitner
 #
 # HexaPDF is free software: you can redistribute it and/or modify it
 # under the terms of the GNU Affero General Public License version 3 as
 # published by the Free Software Foundation with the addition of the
 # following permission added to Section 15 as permitted in Section 7(a):
@@ -237,19 +237,20 @@
         signature[:ByteRange] = [0, 1_000_000_000_000, 1_000_000_000_000, 1_000_000_000_000]
         signature[:Contents] = '00' * handler.signature_size # twice the size due to hex encoding
         signature[:M] = Time.now
 
         io = if file_or_io.kind_of?(String)
-               File.open(file_or_io, 'w+')
+               File.open(file_or_io, 'wb+')
              else
                file_or_io
              end
 
         # Save the current state so that we can determine the correct /ByteRange value and set the
         # values
         handler.finalize_objects(signature_field, signature)
-        section = @document.write(io, incremental: true, **write_options)
-        data = section.map {|oid, _gen, entry| [entry.pos, oid] if entry.in_use? }.compact.sort
+        start_xref_position, section = @document.write(io, incremental: true, **write_options)
+        data = section.map {|oid, _gen, entry| [entry.pos, oid] if entry.in_use? }.compact.sort <<
+          [start_xref_position, nil]
         index = data.index {|_pos, oid| oid == signature.oid }
         signature_offset = data[index][0]
         signature_length = data[index + 1][0] - data[index][0]
         io.pos = signature_offset
         signature_data = io.read(signature_length)