libdivecomputer.c: Split dive_cb() callback in two

dive_cb() needs a defined device to work as it's built for DC download
tasks.
Move part of the functionality of dive_cb() to a new function
libdc_header_parser() which can be used to parse headers from raw data
buffers with no device set.
Obviously dive_cb() will call the new funtion for header parsing too.

Two changes in logic:

1- In parse_gasmixes() set data pointer to NULL. This pointer is passed to the
function, but it's not used. While this data pointer exists in DC import, via
dive_cb(), it doesn't in file import as data has previously been set in the
parser.

2- While parsing gas mixes do not return on rc = DC_STATUS_UNSUPORTED because
it would end our dive parsing just if the device doesn't support gases, which
seems undesirable in both, DC or file import.

Signed-off-by: Salvador Cuñat <salvador.cunat@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

0 files changed, 0 insertions, 0 deletions