Being able to synchronize the dive computer clock with the host system
is a very useful feature. Add the infrastructure to support this feature
through the public api.
After being removed from the public api, these functions can be changed
into local, static functions. And in a few cases, they are no longer
necessary and can be removed completely.
The vendor_product_parser_create() and vendor_product_device_open()
functions should be called indirectly, through the generic
dc_device_open() and dc_parser_new() functions. And the
vendor_product_extract_dives() functions are internal functions that
should never have been part of the public api in the first place.
The low level serial and IrDA functions are modified to:
- Use the libdivecomputer namespace prefix.
- Return a more detailed status code instead of the zero on success and
negative on error return value. This will allow to return more
fine-grained error codes.
- The read and write functions have an additional output parameter to
return the actual number of bytes transferred. Since these functions
are not atomic, some data might still be transferred successfully if
an error occurs.
The dive computer backends are updated to use the new api.
Both the allocation and initialization of the object data structure is
now moved to a single function. The corresponding deallocation function
is intended to free objects that have been allocated, but are not fully
initialized yet. The public cleanup function shouldn't be used in such
case, because it may try to release resources that haven't been
initialized yet.
Instead of freeing the object data structure in the backend specific
cleanup function, the memory is now freed automatically in the base
class function. This reduces the amount of boilerplate code in the
backends. Backends that don't allocate any additional resources, do no
longer require a cleanup function at all.
When the close function returns, all resources should be freed,
regardless of whether an error has occured or not. The error code is
purely informative.
However, in order to return the first error code, which is usually the
most interesting one, the current implementation is unnecessary
complicated. If an error occurs, there is no need to exit immediately.
Simply store the error code unless there is already a previous one, and
then continue.
The 6 byte logbook entry gets prepended to the profile data. We need to
take this into account when allocating the memory buffer. Under normal
circumstances this shouldn't be a problem, because a single dive is
usually much smaller than the profile ringbuffer. But it's better to be
on the safe side.
The fingerprint is used unconditionally, regardless of whether it's
explicitly set by the application or not. Therefore it needs to be
initialized properly.
The serial number is stored as a plain 32bit integer, and the device
shows the hexadecimal representation. Because a BCD encoding can only
represent the lower digits (0-9) of a hexadecimal number, the upper
digits (A-F) got mangled.
Reported-By: Nick Shore <support@mac-dive.com>
