| This is invoked by Codecs.mpFormDataDecode() for each file found in
the data, just before the file is created and written. If null is
returned then the file is not created or written. This allows you to
control which files are written and the names of the resulting files.
For Codecs.mpFormDataEncode() this is also invoked on each filename,
allowing you to control the actual name used in the filename
attribute of the Content-Disposition header. This does not change the
name of the file actually read. If null is returned then the file is
ignored.
Parameters:
filename - the original filename in the Content-Disposition header
Parameters:
fieldname - the name of the this field, i.e. the value of thename attribute in Content-Dispositionheader the new file name, or null if the file is to be ignored. |