6419e189a4
Currently, each backend has it's own function to verify whether the object vtable pointer is the expected one. All these functions can be removed in favor of a single isintance function in the base class, which takes the expected vtable pointer as a parameter. Functions which are called through the vtable, don't need to verify the vtable pointer, and those checks are removed.
338 lines
10 KiB
C
338 lines
10 KiB
C
/*
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* libdivecomputer
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*
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* Copyright (C) 2011 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 <libdivecomputer/mares_darwin.h>
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#include <libdivecomputer/units.h>
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#include "context-private.h"
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#include "device-private.h"
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#include "mares_common.h"
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#include "array.h"
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#define ISINSTANCE(device) dc_device_isinstance((device), &mares_darwin_device_vtable)
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#define DARWIN 0
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#define DARWINAIR 1
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typedef struct mares_darwin_layout_t {
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// Memory size.
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unsigned int memsize;
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// Logbook ringbuffer.
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unsigned int rb_logbook_offset;
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unsigned int rb_logbook_size;
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unsigned int rb_logbook_count;
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// Profile ringbuffer
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unsigned int rb_profile_begin;
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unsigned int rb_profile_end;
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// Sample size
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unsigned int samplesize;
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} mares_darwin_layout_t;
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typedef struct mares_darwin_device_t {
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mares_common_device_t base;
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const mares_darwin_layout_t *layout;
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unsigned int model;
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unsigned char fingerprint[6];
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} mares_darwin_device_t;
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static dc_status_t mares_darwin_device_set_fingerprint (dc_device_t *abstract, const unsigned char data[], unsigned int size);
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static dc_status_t mares_darwin_device_dump (dc_device_t *abstract, dc_buffer_t *buffer);
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static dc_status_t mares_darwin_device_foreach (dc_device_t *abstract, dc_dive_callback_t callback, void *userdata);
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static dc_status_t mares_darwin_device_close (dc_device_t *abstract);
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static const dc_device_vtable_t mares_darwin_device_vtable = {
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DC_FAMILY_MARES_DARWIN,
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mares_darwin_device_set_fingerprint, /* set_fingerprint */
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mares_common_device_read, /* read */
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NULL, /* write */
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mares_darwin_device_dump, /* dump */
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mares_darwin_device_foreach, /* foreach */
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mares_darwin_device_close /* close */
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};
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static const mares_darwin_layout_t mares_darwin_layout = {
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0x4000, /* memsize */
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0x0100, /* rb_logbook_offset */
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52, /* rb_logbook_size */
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50, /* rb_logbook_count */
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0x0B30, /* rb_profile_begin */
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0x4000, /* rb_profile_end */
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2 /* samplesize */
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};
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static const mares_darwin_layout_t mares_darwinair_layout = {
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0x4000, /* memsize */
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0x0100, /* rb_logbook_offset */
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60, /* rb_logbook_size */
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50, /* rb_logbook_count */
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0x0CC0, /* rb_profile_begin */
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0x3FFF, /* rb_profile_end */
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3 /* samplesize */
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};
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dc_status_t
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mares_darwin_device_open (dc_device_t **out, dc_context_t *context, const char *name, unsigned int model)
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{
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if (out == NULL)
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return DC_STATUS_INVALIDARGS;
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// Allocate memory.
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mares_darwin_device_t *device = (mares_darwin_device_t *) malloc (sizeof (mares_darwin_device_t));
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if (device == NULL) {
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ERROR (context, "Failed to allocate memory.");
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return DC_STATUS_NOMEMORY;
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}
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// Initialize the base class.
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mares_common_device_init (&device->base, context, &mares_darwin_device_vtable);
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// Set the default values.
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memset (device->fingerprint, 0, sizeof (device->fingerprint));
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device->model = model;
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if (model == DARWINAIR)
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device->layout = &mares_darwinair_layout;
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else
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device->layout = &mares_darwin_layout;
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// Open the device.
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int rc = serial_open (&device->base.port, context, name);
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if (rc == -1) {
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ERROR (context, "Failed to open the serial port.");
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free (device);
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return DC_STATUS_IO;
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}
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// Set the serial communication protocol (9600 8N1).
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rc = serial_configure (device->base.port, 9600, 8, SERIAL_PARITY_NONE, 1, SERIAL_FLOWCONTROL_NONE);
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if (rc == -1) {
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ERROR (context, "Failed to set the terminal attributes.");
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serial_close (device->base.port);
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free (device);
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return DC_STATUS_IO;
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}
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// Set the timeout for receiving data (1000 ms).
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if (serial_set_timeout (device->base.port, 1000) == -1) {
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ERROR (context, "Failed to set the timeout.");
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serial_close (device->base.port);
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free (device);
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return DC_STATUS_IO;
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}
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// Set the DTR/RTS lines.
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if (serial_set_dtr (device->base.port, 1) == -1 ||
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serial_set_rts (device->base.port, 1) == -1) {
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ERROR (context, "Failed to set the DTR/RTS line.");
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serial_close (device->base.port);
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free (device);
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return DC_STATUS_IO;
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}
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// Make sure everything is in a sane state.
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serial_sleep (device->base.port, 100);
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serial_flush (device->base.port, SERIAL_QUEUE_BOTH);
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// Override the base class values.
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device->base.echo = 1;
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device->base.delay = 50;
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*out = (dc_device_t *) device;
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return DC_STATUS_SUCCESS;
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}
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static dc_status_t
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mares_darwin_device_close (dc_device_t *abstract)
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{
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mares_darwin_device_t *device = (mares_darwin_device_t *) abstract;
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// Close the device.
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if (serial_close (device->base.port) == -1) {
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free (device);
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return DC_STATUS_IO;
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}
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// Free memory.
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free (device);
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return DC_STATUS_SUCCESS;
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}
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static dc_status_t
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mares_darwin_device_set_fingerprint (dc_device_t *abstract, const unsigned char data[], unsigned int size)
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{
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mares_darwin_device_t *device = (mares_darwin_device_t *) abstract;
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if (size && size != sizeof (device->fingerprint))
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return DC_STATUS_INVALIDARGS;
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if (size)
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memcpy (device->fingerprint, data, sizeof (device->fingerprint));
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else
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memset (device->fingerprint, 0, sizeof (device->fingerprint));
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return DC_STATUS_SUCCESS;
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}
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static dc_status_t
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mares_darwin_device_dump (dc_device_t *abstract, dc_buffer_t *buffer)
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{
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mares_darwin_device_t *device = (mares_darwin_device_t *) abstract;
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assert (device->layout != NULL);
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// Erase the current contents of the buffer and
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// allocate the required amount of memory.
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if (!dc_buffer_clear (buffer) || !dc_buffer_resize (buffer, device->layout->memsize)) {
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ERROR (abstract->context, "Insufficient buffer space available.");
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return DC_STATUS_NOMEMORY;
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}
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return device_dump_read (abstract, dc_buffer_get_data (buffer),
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dc_buffer_get_size (buffer), PACKETSIZE);
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}
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static dc_status_t
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mares_darwin_device_foreach (dc_device_t *abstract, dc_dive_callback_t callback, void *userdata)
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{
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mares_darwin_device_t *device = (mares_darwin_device_t *) abstract;
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assert (device->layout != NULL);
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dc_buffer_t *buffer = dc_buffer_new (device->layout->memsize);
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if (buffer == NULL)
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return DC_STATUS_NOMEMORY;
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dc_status_t rc = mares_darwin_device_dump (abstract, buffer);
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if (rc != DC_STATUS_SUCCESS) {
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dc_buffer_free (buffer);
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return rc;
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}
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// Emit a device info event.
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unsigned char *data = dc_buffer_get_data (buffer);
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dc_event_devinfo_t devinfo;
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devinfo.model = device->model;
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devinfo.firmware = 0;
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devinfo.serial = array_uint16_be (data + 8);
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device_event_emit (abstract, DC_EVENT_DEVINFO, &devinfo);
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rc = mares_darwin_extract_dives (abstract, dc_buffer_get_data (buffer),
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dc_buffer_get_size (buffer), callback, userdata);
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dc_buffer_free (buffer);
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return rc;
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}
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dc_status_t
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mares_darwin_extract_dives (dc_device_t *abstract, const unsigned char data[], unsigned int size, dc_dive_callback_t callback, void *userdata)
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{
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mares_darwin_device_t *device = (mares_darwin_device_t *) abstract;
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if (!ISINSTANCE (abstract))
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return DC_STATUS_INVALIDARGS;
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assert (device->layout != NULL);
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const mares_darwin_layout_t *layout = device->layout;
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// Get the profile pointer.
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unsigned int eop = array_uint16_be (data + 0x8A);
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if (eop < layout->rb_profile_begin || eop >= layout->rb_profile_end) {
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ERROR (abstract->context, "Invalid ringbuffer pointer detected.");
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return DC_STATUS_DATAFORMAT;
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}
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// Get the logbook index.
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unsigned int last = data[0x8C];
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if (last >= layout->rb_logbook_count) {
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ERROR (abstract->context, "Invalid ringbuffer pointer detected.");
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return DC_STATUS_DATAFORMAT;
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}
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// Allocate memory for the largest possible dive.
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unsigned char *buffer = (unsigned char *) malloc (layout->rb_logbook_size + layout->rb_profile_end - layout->rb_profile_begin);
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if (buffer == NULL) {
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ERROR (abstract->context, "Failed to allocate memory.");
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return DC_STATUS_NOMEMORY;
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}
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// The logbook ringbuffer can store a fixed amount of entries, but there
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// is no guarantee that the profile ringbuffer will contain a profile for
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// each entry. The number of remaining bytes (which is initialized to the
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// largest possible value) is used to detect the last valid profile.
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unsigned int remaining = layout->rb_profile_end - layout->rb_profile_begin;
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unsigned int current = eop;
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for (unsigned int i = 0; i < layout->rb_logbook_count; ++i) {
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// Get the offset to the current logbook entry in the ringbuffer.
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unsigned int idx = (layout->rb_logbook_count + last - i) % layout->rb_logbook_count;
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unsigned int offset = layout->rb_logbook_offset + idx * layout->rb_logbook_size;
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// Get the length of the current dive.
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unsigned int nsamples = array_uint16_be (data + offset + 6);
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unsigned int length = nsamples * layout->samplesize;
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if (nsamples == 0xFFFF || length > remaining)
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break;
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// Copy the logbook entry.
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memcpy (buffer, data + offset, layout->rb_logbook_size);
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// Copy the profile data.
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if (current < layout->rb_profile_begin + length) {
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unsigned int a = current - layout->rb_profile_begin;
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unsigned int b = length - a;
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memcpy (buffer + layout->rb_logbook_size, data + layout->rb_profile_end - b, b);
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memcpy (buffer + layout->rb_logbook_size + b, data + layout->rb_profile_begin, a);
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current = layout->rb_profile_end - b;
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} else {
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memcpy (buffer + layout->rb_logbook_size, data + current - length, length);
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current -= length;
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}
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if (device && memcmp (buffer, device->fingerprint, sizeof (device->fingerprint)) == 0) {
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free (buffer);
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return DC_STATUS_SUCCESS;
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}
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if (callback && !callback (buffer, layout->rb_logbook_size + length, buffer, 6, userdata)) {
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free (buffer);
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return DC_STATUS_SUCCESS;
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}
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remaining -= length;
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}
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free (buffer);
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return DC_STATUS_SUCCESS;
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}
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