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A Real example: mod_txt

mod_txt is a simple output filter module to display plain text files as HTML (or XHTML) with a header and footer. When a text file is requested, it escapes the text as required for HTML, and displays it between the header and the footer.

It works by direct manipulation of buckets (the lowest-level API), and demonstrates both insertion of file data and substitution of characters, without any allocation of moving of big blocks.