The (trivial) CRC code was copied from gstreamer. However, the license
stated here was LGPLv2 rather than LGPLv2.1+. Identical code can currently
be found upstream in gstreamer licensed under LGPLv2+. As such, update
the license, making it more compatible with the rest of libfprint.
Also add the "or any later version" to upekts.c. The library was already
LGPL2.1+ at the time and libthinkfinger authors approved a license
change.
This command is useful to immediately continue rather than waiting for
input. It is only useful for non-scanning device actions and can be
important when steps need to be explicitly skipped (e.g. to inject an
error in the second command without a way to wait in between).
We were attaching the sources to the default main context. Instead, we
should be attaching them to the current tasks main context (or, failing
that, the current thread local main context).
g_idle_add attaches to the default main context, but the rest of
libfprint is using the thread local main context. Switch to use the
internal fpi_device_add_timeout API for the workaround in order to
not rely on the default main context.
Unfortunately, the implementation was not thread safe and was not
sticking to the thread local main context.
In addition to this, it is not entirely clear to me how this API should
behave. The current approach is to simply cancel the transition with the
state machine halting in its current state. Instead, it could also make
sense for cancellation to cause the state machine to return a
G_IO_ERROR_CANCELLED.
As such, simply remove the feature for now. If anyone actually has a
good use-case then we can add it again.
libfprint uses the thread local context in almost all cases. Update
FpContext to also use it and make sure that any sources are removed when
the FpContext object is finalized. Otherwise we may run into
use-after-free issues.
In some situations one may want to guarantee that the last steps of an
SSM are run even when the SSM is completed early or failed.
This can easily be done by making fpi_ssm_mark_completed jump to the
next cleanup stage when called (this also includes mark_failed). Due to
the mechanism, it is still possible to explicitly jump cleanup states by
using fpi_ssm_jump_to_state, including a jump to the final state in
order to skip all cleanup states.
Benjamin Berg