I'm getting a bit confused about the rubyzip api.

I am creating a zip file, and want to add an entry to it where:

1. I do not have a local File for the contents I want to add. I have the data in memory (or in an IO stream object that is not a File)
2. I want to add the entry as STORED, mode not DEFLATE.

For the first criteria, not having a local file, I think this would work:

Zip::OutputStream.open('exampleout.zip') do |zos|
  zos.put_next_entry(desired_filename)
  zos.puts some_binary_content
end

For the second criteria, STORED rather than DEFLATE, I figured out with difficulty this:

 entry = ::Zip::Entry.new(zipfile.name, desired_filename, nil, nil, nil, nil, ::Zip::Entry::STORED)
 zipfile.add(entry, File.open("something"))

But these are entirely different APIs. For the OutputStream API in the first example... there doens't seem to be any way to specify STORED rather than DEFLATE?

For the Zip::Entry/add API in the second example... there doesn't seem to be any way to pass it something that isn't a real file object. If I pass it a string to zipfile.add(entry, "foo bar"), I get No such file or directory @ rb_file_s_lstat - foo bar.

Is there any API that does both things? Looking at the source for the #add method, it's described as a "convenience method", so maybe I can do just what it's doing myself in more steps -- but it's implementation accesses the @entry_set iVar, so I can't do just what it does in my own caller code....

Is there any API that has all the features I need?