82a0fc97a0
The total memory size is hardcoded again because the protocol does not allow to retrieve the correct memory layout in advance. As long as there is no device with a different amount of memory, that should be fine.
371 lines
9.9 KiB
C
371 lines
9.9 KiB
C
/*
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* libdivecomputer
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*
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* Copyright (C) 2008 Jef Driesen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "mares_nemo.h"
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#include "parser-private.h"
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#include "units.h"
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#include "utils.h"
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#include "array.h"
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typedef struct mares_nemo_parser_t mares_nemo_parser_t;
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struct mares_nemo_parser_t {
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parser_t base;
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unsigned int model;
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unsigned int freedive;
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/* Internal state */
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unsigned int mode;
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unsigned int length;
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unsigned int sample_count;
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unsigned int sample_size;
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unsigned int header;
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unsigned int extra;
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};
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static parser_status_t mares_nemo_parser_set_data (parser_t *abstract, const unsigned char *data, unsigned int size);
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static parser_status_t mares_nemo_parser_get_datetime (parser_t *abstract, dc_datetime_t *datetime);
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static parser_status_t mares_nemo_parser_samples_foreach (parser_t *abstract, sample_callback_t callback, void *userdata);
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static parser_status_t mares_nemo_parser_destroy (parser_t *abstract);
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static const parser_backend_t mares_nemo_parser_backend = {
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PARSER_TYPE_MARES_NEMO,
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mares_nemo_parser_set_data, /* set_data */
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mares_nemo_parser_get_datetime, /* datetime */
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mares_nemo_parser_samples_foreach, /* samples_foreach */
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mares_nemo_parser_destroy /* destroy */
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};
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static int
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parser_is_mares_nemo (parser_t *abstract)
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{
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if (abstract == NULL)
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return 0;
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return abstract->backend == &mares_nemo_parser_backend;
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}
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parser_status_t
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mares_nemo_parser_create (parser_t **out, unsigned int model)
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{
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if (out == NULL)
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return PARSER_STATUS_ERROR;
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// Allocate memory.
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mares_nemo_parser_t *parser = (mares_nemo_parser_t *) malloc (sizeof (mares_nemo_parser_t));
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if (parser == NULL) {
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WARNING ("Failed to allocate memory.");
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return PARSER_STATUS_MEMORY;
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}
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// Initialize the base class.
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parser_init (&parser->base, &mares_nemo_parser_backend);
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// Get the freedive mode for this model.
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unsigned int freedive = 2;
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if (model == 1 || model == 7)
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freedive = 3;
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// Set the default values.
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parser->model = model;
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parser->freedive = freedive;
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parser->mode = 0;
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parser->length = 0;
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parser->sample_count = 0;
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parser->sample_size = 0;
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parser->header = 0;
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parser->extra = 0;
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*out = (parser_t*) parser;
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return PARSER_STATUS_SUCCESS;
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}
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static parser_status_t
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mares_nemo_parser_destroy (parser_t *abstract)
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{
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if (! parser_is_mares_nemo (abstract))
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return PARSER_STATUS_TYPE_MISMATCH;
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// Free memory.
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free (abstract);
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return PARSER_STATUS_SUCCESS;
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}
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static parser_status_t
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mares_nemo_parser_set_data (parser_t *abstract, const unsigned char *data, unsigned int size)
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{
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mares_nemo_parser_t *parser = (mares_nemo_parser_t *) abstract;
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// Clear the previous state.
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parser->base.data = NULL;
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parser->base.size = 0;
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parser->mode = 0;
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parser->length = 0;
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parser->sample_count = 0;
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parser->sample_size = 0;
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parser->header = 0;
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parser->extra = 0;
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if (size == 0)
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return PARSER_STATUS_SUCCESS;
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if (size < 2 + 3)
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return PARSER_STATUS_ERROR;
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unsigned int length = array_uint16_le (data);
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if (length > size)
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return PARSER_STATUS_ERROR;
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unsigned int extra = 0;
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const unsigned char marker[3] = {0xAA, 0xBB, 0xCC};
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if (memcmp (data + length - 3, marker, sizeof (marker)) == 0) {
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if (parser->model == 19)
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extra = 7;
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else
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extra = 12;
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}
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if (length < 2 + extra + 3)
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return PARSER_STATUS_ERROR;
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unsigned int mode = data[length - extra - 1];
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unsigned int header_size = 53;
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unsigned int sample_size = 2;
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if (extra) {
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if (parser->model == 19)
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sample_size = 3;
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else
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sample_size = 5;
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}
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if (mode == parser->freedive) {
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header_size = 28;
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sample_size = 6;
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}
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unsigned int nsamples = array_uint16_le (data + length - extra - 3);
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unsigned int nbytes = 2 + nsamples * sample_size + header_size + extra;
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if (length != nbytes)
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return PARSER_STATUS_ERROR;
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// Store the new state.
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parser->base.data = data;
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parser->base.size = size;
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parser->mode = mode;
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parser->length = length;
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parser->sample_count = nsamples;
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parser->sample_size = sample_size;
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parser->header = header_size;
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parser->extra = extra;
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return PARSER_STATUS_SUCCESS;
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}
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static parser_status_t
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mares_nemo_parser_get_datetime (parser_t *abstract, dc_datetime_t *datetime)
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{
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mares_nemo_parser_t *parser = (mares_nemo_parser_t *) abstract;
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if (abstract->size == 0)
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return PARSER_STATUS_ERROR;
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const unsigned char *p = abstract->data + parser->length - parser->extra - 8;
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if (datetime) {
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datetime->year = p[0] + 2000;
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datetime->month = p[1];
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datetime->day = p[2];
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datetime->hour = p[3];
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datetime->minute = p[4];
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datetime->second = 0;
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}
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return PARSER_STATUS_SUCCESS;
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}
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static parser_status_t
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mares_nemo_parser_samples_foreach (parser_t *abstract, sample_callback_t callback, void *userdata)
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{
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mares_nemo_parser_t *parser = (mares_nemo_parser_t *) abstract;
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if (abstract->size == 0)
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return PARSER_STATUS_ERROR;
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const unsigned char *data = abstract->data;
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unsigned int size = abstract->size;
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if (parser->mode != parser->freedive) {
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unsigned int time = 0;
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for (unsigned int i = 0; i < parser->sample_count; ++i) {
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parser_sample_value_t sample = {0};
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unsigned int idx = 2 + parser->sample_size * i;
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unsigned int value = array_uint16_le (data + idx);
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unsigned int depth = value & 0x0FFF;
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unsigned int ascent = (value & 0xC000) >> 14;
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unsigned int violation = (value & 0x2000) >> 13;
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unsigned int deco = (value & 0x1000) >> 12;
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// Time (seconds).
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time += 20;
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sample.time = time;
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if (callback) callback (SAMPLE_TYPE_TIME, sample, userdata);
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// Depth (1/10 m).
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sample.depth = depth / 10.0;
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if (callback) callback (SAMPLE_TYPE_DEPTH, sample, userdata);
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// Ascent rate
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if (ascent) {
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sample.event.type = SAMPLE_EVENT_ASCENT;
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sample.event.time = 0;
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sample.event.flags = 0;
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sample.event.value = ascent;
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if (callback) callback (SAMPLE_TYPE_EVENT, sample, userdata);
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}
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// Deco violation
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if (violation) {
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sample.event.type = SAMPLE_EVENT_CEILING;
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sample.event.time = 0;
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sample.event.flags = 0;
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sample.event.value = 0;
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if (callback) callback (SAMPLE_TYPE_EVENT, sample, userdata);
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}
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// Deco stop
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if (deco) {
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sample.event.type = SAMPLE_EVENT_DECOSTOP;
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sample.event.time = 0;
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sample.event.flags = 0;
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sample.event.value = 0;
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if (callback) callback (SAMPLE_TYPE_EVENT, sample, userdata);
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}
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// Pressure (1 bar).
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if (parser->sample_size == 3) {
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sample.pressure.tank = 0;
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sample.pressure.value = data[idx + 2];
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if (callback) callback (SAMPLE_TYPE_PRESSURE, sample, userdata);
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}
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}
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} else {
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// A freedive session contains only summaries for each individual
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// freedive. The detailed profile data (if present) is stored after
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// the normal dive data. We assume a freedive has a detailed profile
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// when the buffer contains more data than the size indicated in the
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// header.
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int profiles = (size > parser->length);
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unsigned int time = 0;
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unsigned int offset = parser->length;
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for (unsigned int i = 0; i < parser->sample_count; ++i) {
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parser_sample_value_t sample = {0};
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unsigned int idx = 2 + parser->sample_size * i;
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unsigned int maxdepth = array_uint16_le (data + idx);
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unsigned int divetime = data[idx + 2] + data[idx + 3] * 60;
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unsigned int surftime = data[idx + 4] + data[idx + 5] * 60;
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// Surface Time (seconds).
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time += surftime;
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sample.time = time;
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if (callback) callback (SAMPLE_TYPE_TIME, sample, userdata);
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// Surface Depth (0 m).
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sample.depth = 0.0;
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if (callback) callback (SAMPLE_TYPE_DEPTH, sample, userdata);
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if (profiles) {
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// Get the freedive sample interval for this model.
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unsigned int interval = 4;
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if (parser->model == 18)
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interval = 1;
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// Calculate the number of samples that should be present
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// in the profile data, based on the divetime in the summary.
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unsigned int n = (divetime + interval - 1) / interval;
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// The last sample interval can be smaller than the normal
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// 4 seconds. We keep track of the maximum divetime, to be
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// able to adjust that last sample interval.
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unsigned int maxtime = time + divetime;
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// Process all depth samples. Once a zero depth sample is
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// reached, the current freedive profile is complete.
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unsigned int count = 0;
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while (offset + 2 <= size) {
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unsigned int depth = array_uint16_le (data + offset);
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offset += 2;
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if (depth == 0)
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break;
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count++;
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assert (count <= n);
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// Time (seconds).
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time += interval;
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if (time > maxtime)
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time = maxtime; // Adjust the last sample.
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sample.time = time;
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if (callback) callback (SAMPLE_TYPE_TIME, sample, userdata);
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// Depth (1/10 m).
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sample.depth = depth / 10.0;
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if (callback) callback (SAMPLE_TYPE_DEPTH, sample, userdata);
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}
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// Verify that the number of samples in the profile data
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// equals the predicted number of samples (from the divetime
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// in the summary entry). If both values are different, the
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// the profile data is probably incorrect.
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assert (count == n);
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} else {
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// Dive Time (seconds).
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time += divetime;
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sample.time = time;
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if (callback) callback (SAMPLE_TYPE_TIME, sample, userdata);
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// Maximum Depth (1/10 m).
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sample.depth = maxdepth / 10.0;
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if (callback) callback (SAMPLE_TYPE_DEPTH, sample, userdata);
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}
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}
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assert (offset == size);
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}
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return PARSER_STATUS_SUCCESS;
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}
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