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Remove disabled gas mixes

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Returning disabled gas mixes to the application mainly results in lots
of unnecessary information. Therefore, remove all disabled gas mixes,
unless they are actively used. Many other dive computers do not even
include disabled gas mixes in the data.

Unlike previously assumed, the on/off state of each gas mix is actually
available in the PNF data format (opening record 4). For the older
Predator data format, this info isn't available and all gas mixes are
manually marked as enabled.
This commit is contained in:
Jef Driesen 2023-11-12 21:01:57 +01:00
parent e1762fc8bd
commit 2d9008aff7
1 changed files with 16 additions and 0 deletions
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16
src/shearwater_predator_parser.c
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@ -107,6 +107,8 @@ typedef struct shearwater_predator_gasmix_t {
unsigned int oxygen;
unsigned int helium;
unsigned int diluent;
unsigned int enabled;
unsigned int active;
} shearwater_predator_gasmix_t;
typedef struct shearwater_predator_tank_t {
@ -245,6 +247,8 @@ shearwater_common_parser_create (dc_parser_t **out, dc_context_t *context, const
parser->gasmix[i].oxygen = 0;
parser->gasmix[i].helium = 0;
parser->gasmix[i].diluent = 0;
parser->gasmix[i].enabled = 0;
parser->gasmix[i].active = 0;
}
parser->ntanks = 0;
for (unsigned int i = 0; i < NTANKS; ++i) {
@ -395,6 +399,7 @@ shearwater_predator_parser_cache (shearwater_predator_parser_t *parser)
gasmix[i].oxygen = data[20 + i];
gasmix[i].helium = data[30 + i];
gasmix[i].diluent = i >= 5;
gasmix[i].enabled = 1;
}
}
@ -443,6 +448,8 @@ shearwater_predator_parser_cache (shearwater_predator_parser_t *parser)
ngasmixes = idx + 1;
}
gasmix[idx].active = 1;
o2_previous = o2;
he_previous = he;
dil_previous = ccr;
@ -552,6 +559,13 @@ shearwater_predator_parser_cache (shearwater_predator_parser_t *parser)
}
}
}
// Gas mix on/off state.
unsigned int state = array_uint16_be (data + offset + 17);
for (unsigned int i = 0; i < NFIXED; ++i) {
gasmix[i].enabled = (state & (1 << i)) != 0;
}
unsigned int gtrmode = data[offset + 29];
if (popcount(gtrmode) >= 2) {
for (unsigned int i = 0; i < 4; ++i) {
@ -678,6 +692,8 @@ shearwater_predator_parser_cache (shearwater_predator_parser_t *parser)
for (unsigned int i = 0; i < ngasmixes; ++i) {
if (gasmix[i].oxygen == 0 && gasmix[i].helium == 0)
continue;
if (!gasmix[i].enabled && !gasmix[i].active)
continue;
if (gasmix[i].diluent && !shearwater_predator_is_ccr (divemode))
continue;
parser->gasmix[parser->ngasmixes] = gasmix[i];