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/*------------------------------------------------------------------------
* Copyright 2019 (c) Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
*
* This file is part of the ZBar Bar Code Reader.
*
* The ZBar Bar Code Reader is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* The ZBar Bar Code Reader 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 Public License for more details.
*------------------------------------------------------------------------*/
#include <argp.h>
#include <dbus/dbus.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define ZBAR_INTERFACE "org.linuxtv.Zbar1.Code"
#define ZBAR_SIGNAL_CODE "Code"
#define ZBAR_SIGNAL_TYPE "Type"
#define ZBAR_SIGNAL_DATA "Data"
#define ZBAR_SIGNAL_BINARY_DATA "BinaryData"
#define PROGRAM_NAME "test_dbus"
static const char doc[] = "\nTest if ZBar is sending codes via D-Bus\n";
static const struct argp_option options[] = {
{ "count", 'c', "#codes", 0, "Stop after received #codes", 0 },
{ "time", 't', "#seconds", 0, "Stop after #seconds", 0 },
{ "log", 'l', "#file", 0, "Write log to #file", 0 },
{ "bin-log", 'b', "#file", 0, "Write binary log to #file", 0 },
{ "help", '?', 0, 0, "Give this help list", -1 },
{ "usage", -3, 0, 0, "Give a short usage message", 0 },
{ 0 }
};
static int max_msg = 0;
static int timeout = 0;
static FILE *log = NULL;
static FILE *bin_log = NULL;
static error_t parse_opt(int k, char *optarg, struct argp_state *state)
{
switch (k) {
case 'c':
max_msg = strtoul(optarg, NULL, 0);
break;
case 't':
timeout = strtoul(optarg, NULL, 0);
break;
case 'l':
log = fopen(optarg, "wb");
break;
case 'b':
bin_log = fopen(optarg, "wb");
break;
case '?':
argp_state_help(state, state->out_stream,
ARGP_HELP_SHORT_USAGE | ARGP_HELP_LONG | ARGP_HELP_DOC);
exit(0);
case -3:
argp_state_help(state, state->out_stream, ARGP_HELP_USAGE);
exit(0);
default:
return ARGP_ERR_UNKNOWN;
};
return 0;
}
static const struct argp argp = {
.options = options,
.parser = parse_opt,
.doc = doc,
};
int main(int argc, char *argv[])
{
DBusMessage *msg;
DBusMessageIter args, entry, dict, val;
DBusConnection *conn;
DBusError err;
char *str, *property;
int count = 0, length = 0;
if (argp_parse(&argp, argc, argv, ARGP_NO_HELP | ARGP_NO_EXIT, 0, 0)) {
argp_help(&argp, stderr, ARGP_HELP_SHORT_USAGE, PROGRAM_NAME);
return -1;
}
if (!log)
log = fdopen(dup(fileno(stderr)), "w+");
if (!bin_log)
bin_log = fdopen(dup(fileno(stderr)), "w+");
// initialise the error value
dbus_error_init(&err);
// connect to the DBUS system bus, and check for errors
conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
if (dbus_error_is_set(&err)) {
fprintf(stderr, "Connection Error (%s)\n", err.message);
dbus_error_free(&err);
}
if (!conn) {
fprintf(stderr, "Connection Null\n");
return -1;
}
dbus_bus_add_match(conn, "type='signal',interface='" ZBAR_INTERFACE "'",
&err);
dbus_connection_flush(conn);
if (dbus_error_is_set(&err)) {
fprintf(stderr, "Match Error (%s)\n", err.message);
exit(1);
}
if (timeout)
alarm(timeout);
/* loop listening for signals being emitted */
fprintf(stderr, "Waiting for Zbar events\n");
while (true) {
// non blocking read of the next available message
dbus_connection_read_write(conn, 0);
msg = dbus_connection_pop_message(conn);
// loop again if we haven't read a message
if (NULL == msg) {
sleep(1);
continue;
}
// check if the message is a signal from the correct interface and with the
// correct name
if (dbus_message_is_signal(msg, ZBAR_INTERFACE, ZBAR_SIGNAL_CODE)) {
// read the parameters
if (!dbus_message_iter_init(msg, &args))
fprintf(stderr, "Message has no arguments!\n");
else if (DBUS_TYPE_ARRAY != dbus_message_iter_get_arg_type(&args))
fprintf(stderr, "Argument is not array!\n");
else {
while (dbus_message_iter_get_arg_type(&args) !=
DBUS_TYPE_INVALID) {
dbus_message_iter_recurse(&args, &entry);
if (DBUS_TYPE_DICT_ENTRY !=
dbus_message_iter_get_arg_type(&entry)) {
fprintf(stderr, "Element is not dict entry!\n");
} else {
while (dbus_message_iter_get_arg_type(&entry) !=
DBUS_TYPE_INVALID) {
dbus_message_iter_recurse(&entry, &dict);
if (DBUS_TYPE_STRING !=
dbus_message_iter_get_arg_type(&dict)) {
fprintf(stderr,
"Dict Entry key is not string!\n");
} else {
dbus_message_iter_get_basic(&dict, &property);
dbus_message_iter_next(&dict);
if (DBUS_TYPE_VARIANT !=
dbus_message_iter_get_arg_type(&dict)) {
fprintf(
stderr,
"Dict Entry value is not variant!\n");
} else {
dbus_message_iter_recurse(&dict, &val);
if (strcmp(property, ZBAR_SIGNAL_TYPE) ==
0) {
if (DBUS_TYPE_STRING !=
dbus_message_iter_get_arg_type(
&val)) {
fprintf(
stderr,
"Dict Entry value for barcode type is not string!\n");
} else {
dbus_message_iter_get_basic(&val,
&str);
fprintf(stderr, "Type = %s\n", str);
}
} else if (strcmp(property,
ZBAR_SIGNAL_DATA) == 0) {
if (DBUS_TYPE_STRING !=
dbus_message_iter_get_arg_type(
&val)) {
fprintf(
stderr,
"Dict Entry value for barcode text data is not string!\n");
} else {
dbus_message_iter_get_basic(&val,
&str);
fprintf(stderr, "Value = %s\n",
str);
fprintf(log, "%s\n", str);
}
} else if (strcmp(property,
ZBAR_SIGNAL_BINARY_DATA) ==
0) {
if (DBUS_TYPE_ARRAY !=
dbus_message_iter_get_arg_type(
&val)) {
fprintf(
stderr,
"Dict Entry value for barcode binary data is not array!\n");
} else {
dbus_message_iter_recurse(&val,
&val);
if (DBUS_TYPE_BYTE !=
dbus_message_iter_get_arg_type(
&val)) {
fprintf(
stderr,
"Dict Entry value for barcode binary data is not array of bytes!\n");
} else {
dbus_message_iter_get_fixed_array(
&val, &str, &length);
fprintf(stderr,
"BinaryData[%d]\n",
length);
fwrite(str, sizeof(*str),
length, bin_log);
}
}
}
}
}
dbus_message_iter_next(&entry);
}
/* If max_msg > 0, stops after receiving 'count' messages */
if (++count == max_msg) {
dbus_message_unref(msg);
return 0;
}
}
dbus_message_iter_next(&args);
}
}
}
// free the message
dbus_message_unref(msg);
}
fclose(log);
fclose(bin_log);
return 0;
}
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