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libdivecomputer/src/mares_darwin_parser.c
Jef Driesen 63f5a4d652 Remove the dc_parser_set_data function 
The dc_parser_set_data() function allows to re-use a parser object for
multiple dives. The advantages of this feature are actually very limited
in practice. The reduction in memory consumption is almost negligible,
because the amount of internal state in the parser is typically very
small. But the implementation requires some additional complexity
because each backend needs code to reset its internal state. Therefore,
the function is removed and the data and size needs to be passed
directly to the dc_parser_new() and dc_parser_new2() functions instead.

Because keeping a reference to the data has also caused issues in the
past, especially for applications implemented in a garbage collected
language, the data will now also get copied internally.
2023-05-15 22:19:37 +02:00

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/*
* libdivecomputer
*
* Copyright (C) 2011 Jef Driesen
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <stdlib.h>
#include <string.h>
#include <libdivecomputer/units.h>
#include "mares_darwin.h"
#include "context-private.h"
#include "parser-private.h"
#include "array.h"
#define ISINSTANCE(parser) dc_parser_isinstance((parser), &mares_darwin_parser_vtable)
#define DARWIN 0
#define DARWINAIR 1
#define AIR 0
#define GAUGE 1
#define NITROX 2
typedef struct mares_darwin_parser_t mares_darwin_parser_t;
struct mares_darwin_parser_t {
dc_parser_t base;
unsigned int model;
unsigned int headersize;
unsigned int samplesize;
};
static dc_status_t mares_darwin_parser_get_datetime (dc_parser_t *abstract, dc_datetime_t *datetime);
static dc_status_t mares_darwin_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsigned int flags, void *value);
static dc_status_t mares_darwin_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_t callback, void *userdata);
static const dc_parser_vtable_t mares_darwin_parser_vtable = {
sizeof(mares_darwin_parser_t),
DC_FAMILY_MARES_DARWIN,
NULL, /* set_clock */
NULL, /* set_atmospheric */
NULL, /* set_density */
mares_darwin_parser_get_datetime, /* datetime */
mares_darwin_parser_get_field, /* fields */
mares_darwin_parser_samples_foreach, /* samples_foreach */
NULL /* destroy */
};
dc_status_t
mares_darwin_parser_create (dc_parser_t **out, dc_context_t *context, const unsigned char data[], size_t size, unsigned int model)
{
mares_darwin_parser_t *parser = NULL;
if (out == NULL)
return DC_STATUS_INVALIDARGS;
// Allocate memory.
parser = (mares_darwin_parser_t *) dc_parser_allocate (context, &mares_darwin_parser_vtable, data, size);
if (parser == NULL) {
ERROR (context, "Failed to allocate memory.");
return DC_STATUS_NOMEMORY;
}
parser->model = model;
if (model == DARWINAIR) {
parser->headersize = 60;
parser->samplesize = 3;
} else {
parser->headersize = 52;
parser->samplesize = 2;
}
*out = (dc_parser_t *) parser;
return DC_STATUS_SUCCESS;
}
static dc_status_t
mares_darwin_parser_get_datetime (dc_parser_t *abstract, dc_datetime_t *datetime)
{
mares_darwin_parser_t *parser = (mares_darwin_parser_t *) abstract;
if (abstract->size < parser->headersize)
return DC_STATUS_DATAFORMAT;
const unsigned char *p = abstract->data;
if (datetime) {
datetime->year = array_uint16_be (p);
datetime->month = p[2];
datetime->day = p[3];
datetime->hour = p[4];
datetime->minute = p[5];
datetime->second = 0;
datetime->timezone = DC_TIMEZONE_NONE;
}
return DC_STATUS_SUCCESS;
}
static dc_status_t
mares_darwin_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsigned int flags, void *value)
{
mares_darwin_parser_t *parser = (mares_darwin_parser_t *) abstract;
if (abstract->size < parser->headersize)
return DC_STATUS_DATAFORMAT;
const unsigned char *p = abstract->data;
dc_gasmix_t *gasmix = (dc_gasmix_t *) value;
dc_tank_t *tank = (dc_tank_t *) value;
unsigned int mode = p[0x0C] & 0x03;
if (value) {
switch (type) {
case DC_FIELD_DIVETIME:
*((unsigned int *) value) = array_uint16_be (p + 0x06) * 20;
break;
case DC_FIELD_MAXDEPTH:
*((double *) value) = array_uint16_be (p + 0x08) / 10.0;
break;
case DC_FIELD_GASMIX_COUNT:
if (mode == GAUGE) {
*((unsigned int *) value) = 0;
} else {
*((unsigned int *) value) = 1;
}
break;
case DC_FIELD_GASMIX:
gasmix->usage = DC_USAGE_NONE;
gasmix->helium = 0.0;
if (mode == NITROX) {
gasmix->oxygen = p[0x0E] / 100.0;
} else {
gasmix->oxygen = 0.21;
}
gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
break;
case DC_FIELD_TEMPERATURE_MINIMUM:
*((double *) value) = (signed char) p[0x0A];
break;
case DC_FIELD_TANK_COUNT:
if (parser->model == DARWINAIR) {
*((unsigned int *) value) = 1;
} else {
*((unsigned int *) value) = 0;
}
break;
case DC_FIELD_TANK:
if (parser->model == DARWINAIR) {
tank->type = DC_TANKVOLUME_METRIC;
tank->volume = p[0x13] / 10.0;
tank->workpressure = 0.0;
tank->gasmix = 0;
tank->beginpressure = array_uint16_be (p + 0x17);
tank->endpressure = array_uint16_be (p + 0x19);
tank->usage = DC_USAGE_NONE;
} else {
return DC_STATUS_UNSUPPORTED;
}
break;
case DC_FIELD_DIVEMODE:
switch (mode) {
case AIR:
case NITROX:
*((dc_divemode_t *) value) = DC_DIVEMODE_OC;
break;
case GAUGE:
*((dc_divemode_t *) value) = DC_DIVEMODE_GAUGE;
break;
default:
return DC_STATUS_DATAFORMAT;
}
break;
default:
return DC_STATUS_UNSUPPORTED;
}
}
return DC_STATUS_SUCCESS;
}
static dc_status_t
mares_darwin_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_t callback, void *userdata)
{
mares_darwin_parser_t *parser = (mares_darwin_parser_t *) abstract;
if (abstract->size < parser->headersize)
return DC_STATUS_DATAFORMAT;
unsigned int time = 0;
unsigned int mode = abstract->data[0x0C] & 0x03;
unsigned int pressure = array_uint16_be (abstract->data + 0x17);
unsigned int gasmix_previous = 0xFFFFFFFF;
unsigned int gasmix = gasmix_previous;
if (mode != GAUGE) {
gasmix = 0;
}
unsigned int offset = parser->headersize;
while (offset + parser->samplesize <= abstract->size) {
dc_sample_value_t sample = {0};
unsigned int value = array_uint16_le (abstract->data + offset);
unsigned int depth = value & 0x07FF;
unsigned int ascent = (value & 0xE000) >> 13;
unsigned int violation = (value & 0x1000) >> 12;
unsigned int deco = (value & 0x0800) >> 11;
// Surface Time (seconds).
time += 20;
sample.time = time * 1000;
if (callback) callback (DC_SAMPLE_TIME, &sample, userdata);
// Depth (1/10 m).
sample.depth = depth / 10.0;
if (callback) callback (DC_SAMPLE_DEPTH, &sample, userdata);
// Gas change.
if (gasmix != gasmix_previous) {
sample.gasmix = gasmix;
if (callback) callback (DC_SAMPLE_GASMIX, &sample, userdata);
gasmix_previous = gasmix;
}
// Ascent rate
if (ascent) {
sample.event.type = SAMPLE_EVENT_ASCENT;
sample.event.time = 0;
sample.event.flags = 0;
sample.event.value = ascent;
if (callback) callback (DC_SAMPLE_EVENT, &sample, userdata);
}
// Deco violation
if (violation) {
sample.event.type = SAMPLE_EVENT_CEILING;
sample.event.time = 0;
sample.event.flags = 0;
sample.event.value = 0;
if (callback) callback (DC_SAMPLE_EVENT, &sample, userdata);
}
// Deco stop
if (deco) {
sample.deco.type = DC_DECO_DECOSTOP;
} else {
sample.deco.type = DC_DECO_NDL;
}
sample.deco.time = 0;
sample.deco.depth = 0.0;
sample.deco.tts = 0;
if (callback) callback (DC_SAMPLE_DECO, &sample, userdata);
if (parser->samplesize == 3) {
unsigned int type = (time / 20 + 2) % 3;
if (type == 0) {
// Tank Pressure (bar)
pressure -= abstract->data[offset + 2];
sample.pressure.tank = 0;
sample.pressure.value = pressure;
if (callback) callback (DC_SAMPLE_PRESSURE, &sample, userdata);
}
}
offset += parser->samplesize;
}
return DC_STATUS_SUCCESS;
}
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