GConverter is implemented by objects that convert binary data in various ways. The conversion can be stateful and may fail at any place.
Some example conversions are: character set conversion, compression, decompression and regular expression replace.
This is the main operation used when converting data. It is to be called multiple times in a loop, and each time it will do some work, i.e. producing some output (in outbuf) or consuming some input (from inbuf) or both. If its not possible to do any work an error is returned.
Get the main Gtk struct
Resets all internal state in the converter, making it behave as if it was just created. If the converter has any internal state that would produce output then that output is lost.