E-Sign module support

I am using the webform submission method to the JavaBridge merge. I am able to do textfields, radios, checkboxes, and just figured out how to merge file fields to buttons in the pdf to allow merging images. We added an 'esign' field to our webform using the drupal esign module. This field acts like an image field except it has a base64 encoded image data in the form submission rather than just an fid. So I changed a few lines and made this field work for us in our webform. It merges into the pdf form just like an image would. It is mapped the same way too. So I thought I'd submit my code and see if it would help you to implement this feature more completely.
I have included a file that contains the function I edited and a very small new function that I added. I marked my changes with a BEGIN CARLISLE EDIT and an END CARLISLE EDIT. I know this is a sloppy way of posting this, but I don't have much time and wanted to at least put this out for someone.
This code is only for webforms so I'm not submitting it as a patch, just an example for people wanting to work on this further.