Mares Darwin compatible devices support a nitrox mode. The nitrogen
percentage should only be taken into account when the dive mode is set
to nitrox, because the last used value remains in place for air dives.
The devinfo event with the device serial number is required for the
fingerprint feature. Without this event, applications won't be able to
load (or save) the correct fingerprint. All necessary information is
already available in the initial handshake packet.
A new buffer is allocated for each dive, but only the last one is freed.
Since the code is already prepared to simply re-use the same buffer,
there is no need to allocate those extra buffers.
Just like the D4i and D6i, the new header is a few bytes larger. The
correct variant can again be detected by means of the logbook id tag at
the start of the header.
Libdivecomputer always uses metric units internally. But when reverse
engineering a device that stores everything using imperial units, it's
very convenient to be able to switch the output to imperial units too.
The Shearwater devices support adding, removing or editing gas mixes
during the dive. The pre-defined gas mixes available in the opening and
closing block are only a snapshot of the configuration at the start and
at the end of the dive. Thus by editing the gas mixes during the dive
it's possible to switch to a gas mix that is not present in the opening
(or even the closing block). The parser doesn't support that.
To avoid this problem, we now collect the available gas mixes from the
sample data. As a side effect we only return those gas mixes that are
effectively used during the dive.
One of the newer D4i and D6i firmware versions (for example v1.5.9),
introduces a new variant of the data format. The new dive header is 8
bytes larger. The correct variant can be detected by means of the
logbook id tag at the start of the header.
By reading the hardware descriptor immediately after entering download
or service mode, we can identify the specific model and adapt to minor
differences in the communication protocol.
For the OSTC3 compatible devices, a missing initial gas mix (e.g. no gas
marked as the first gas) leaves the initial gas mix index at its default
value of zero. This is different from the OSTC2 compatible devices,
where a missing initial gas is stored as the value 0xFF.
By initializing the index with the value 0xFF, the existing detection
works for both variants.
The existing output code is removed and replaced with the new XML and
RAW output formats. The desired output format can be selected with a new
command-line option. The XML format remains the default output format.
The RAW output format exports each dive to a raw (binary) file. To
output multiple files, the filename is interpreted as a template and
should contain one or more placeholders.
The new output interface provides the necessary infrastructure to add
support for multiple output formats. Due to the abstract interface, each
new format will require only minimal changes in the application itself.
On BSD based operating systems (which includes Mac OS X), the getopt()
function is posix compliant and thus the option processing stops when
the first non-option is found. But the getopt_long() function permutes
the argument vector, just like the GNU implementation.
Using a leading '+' character in the option string disables the
permutation again.
Unlike the other socket functions, the WSAStartup() function returns the
extended error code directly. A call to the WSAGetLastError() function
is not needed and should not be used.
In freedive mode, samples are only 2 or 4 bytes large, thus a sample
containing all 0x00 bytes represents a zero depth value and not some
invalid data that should be ignored.
I originally assumed the second byte contains the hour, but that turns
out to be wrong. At least some of the bits have a different meaning.
With only seconds and minutes, the maximum divetime is limited to at
most 99 minutes and 59 seconds. That shouldn't be a problem for
freedives.
The Oceanic and Aeris F11 have a configurable sample rate. The possible
sample intervals are 2, 1, 0.5 and 0.25 seconds. Since our smallest unit
of time is one second, we can't represent the last two, and the extra
samples will get dropped for now.
