fines a portable programming interface through the
    use of a set of C type definitions.
    These definitions, defined in in the files <b>tiff.h</b> and
    <b>tiffio.h</b>,
    isolate the <tt>libtiff</tt> API from the characteristics
    of the underlying machine.
    To insure portable code and correct operation, applications that use
    <tt>libtiff</tt> should use the typedefs and follow the function
    prototypes for the library API.
  </p>
  <hr>
  <h2 id="mman">Memory Management</h2>
  <p>
    <