mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-12-26 20:53:07 +00:00
618 lines
22 KiB
C
618 lines
22 KiB
C
#include "gap.h"
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#include "app_common.h"
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#include <ble/ble.h>
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#include <furi_hal.h>
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#include <furi.h>
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#define TAG "BtGap"
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#define FAST_ADV_TIMEOUT 30000
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#define INITIAL_ADV_TIMEOUT 60000
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#define GAP_INTERVAL_TO_MS(x) (uint16_t)((x)*1.25)
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typedef struct {
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uint16_t gap_svc_handle;
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uint16_t dev_name_char_handle;
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uint16_t appearance_char_handle;
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uint16_t connection_handle;
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uint8_t adv_svc_uuid_len;
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uint8_t adv_svc_uuid[20];
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char* adv_name;
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} GapSvc;
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typedef struct {
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GapSvc service;
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GapConfig* config;
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GapConnectionParams connection_params;
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GapState state;
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int8_t conn_rssi;
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uint32_t time_rssi_sample;
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FuriMutex* state_mutex;
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GapEventCallback on_event_cb;
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void* context;
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FuriTimer* advertise_timer;
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FuriThread* thread;
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FuriMessageQueue* command_queue;
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bool enable_adv;
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} Gap;
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typedef enum {
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GapCommandAdvFast,
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GapCommandAdvLowPower,
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GapCommandAdvStop,
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GapCommandKillThread,
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} GapCommand;
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// Identity root key
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static const uint8_t gap_irk[16] =
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{0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0, 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0};
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// Encryption root key
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static const uint8_t gap_erk[16] =
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{0xfe, 0xdc, 0xba, 0x09, 0x87, 0x65, 0x43, 0x21, 0xfe, 0xdc, 0xba, 0x09, 0x87, 0x65, 0x43, 0x21};
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static Gap* gap = NULL;
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static void gap_advertise_start(GapState new_state);
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static int32_t gap_app(void* context);
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/** function for updating rssi informations in global Gap object
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*
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*/
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static inline void fetch_rssi() {
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uint8_t ret_rssi = 127;
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if(hci_read_rssi(gap->service.connection_handle, &ret_rssi) == BLE_STATUS_SUCCESS) {
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gap->conn_rssi = (int8_t)ret_rssi;
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gap->time_rssi_sample = furi_get_tick();
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return;
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}
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FURI_LOG_D(TAG, "Failed to read RSSI");
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}
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static void gap_verify_connection_parameters(Gap* gap) {
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furi_assert(gap);
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FURI_LOG_I(
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TAG,
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"Connection parameters: Connection Interval: %d (%d ms), Slave Latency: %d, Supervision Timeout: %d",
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gap->connection_params.conn_interval,
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GAP_INTERVAL_TO_MS(gap->connection_params.conn_interval),
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gap->connection_params.slave_latency,
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gap->connection_params.supervisor_timeout);
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// Send connection parameters request update if necessary
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GapConnectionParamsRequest* params = &gap->config->conn_param;
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if(params->conn_int_min > gap->connection_params.conn_interval ||
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params->conn_int_max < gap->connection_params.conn_interval) {
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FURI_LOG_W(TAG, "Unsupported connection interval. Request connection parameters update");
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if(aci_l2cap_connection_parameter_update_req(
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gap->service.connection_handle,
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params->conn_int_min,
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params->conn_int_max,
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gap->connection_params.slave_latency,
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gap->connection_params.supervisor_timeout)) {
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FURI_LOG_E(TAG, "Failed to request connection parameters update");
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}
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}
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}
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SVCCTL_UserEvtFlowStatus_t SVCCTL_App_Notification(void* pckt) {
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hci_event_pckt* event_pckt;
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evt_le_meta_event* meta_evt;
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evt_blecore_aci* blue_evt;
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hci_le_phy_update_complete_event_rp0* evt_le_phy_update_complete;
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uint8_t tx_phy;
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uint8_t rx_phy;
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tBleStatus ret = BLE_STATUS_INVALID_PARAMS;
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event_pckt = (hci_event_pckt*)((hci_uart_pckt*)pckt)->data;
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if(gap) {
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furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
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}
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switch(event_pckt->evt) {
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case HCI_DISCONNECTION_COMPLETE_EVT_CODE: {
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hci_disconnection_complete_event_rp0* disconnection_complete_event =
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(hci_disconnection_complete_event_rp0*)event_pckt->data;
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if(disconnection_complete_event->Connection_Handle == gap->service.connection_handle) {
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gap->service.connection_handle = 0;
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gap->state = GapStateIdle;
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FURI_LOG_I(
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TAG, "Disconnect from client. Reason: %02X", disconnection_complete_event->Reason);
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}
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// Enterprise sleep
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furi_delay_us(666 + 666);
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if(gap->enable_adv) {
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// Restart advertising
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gap_advertise_start(GapStateAdvFast);
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}
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GapEvent event = {.type = GapEventTypeDisconnected};
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gap->on_event_cb(event, gap->context);
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} break;
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case HCI_LE_META_EVT_CODE:
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meta_evt = (evt_le_meta_event*)event_pckt->data;
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switch(meta_evt->subevent) {
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case HCI_LE_CONNECTION_UPDATE_COMPLETE_SUBEVT_CODE: {
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hci_le_connection_update_complete_event_rp0* event =
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(hci_le_connection_update_complete_event_rp0*)meta_evt->data;
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gap->connection_params.conn_interval = event->Conn_Interval;
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gap->connection_params.slave_latency = event->Conn_Latency;
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gap->connection_params.supervisor_timeout = event->Supervision_Timeout;
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FURI_LOG_I(TAG, "Connection parameters event complete");
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gap_verify_connection_parameters(gap);
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// Save rssi for current connection
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fetch_rssi();
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break;
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}
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case HCI_LE_PHY_UPDATE_COMPLETE_SUBEVT_CODE:
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evt_le_phy_update_complete = (hci_le_phy_update_complete_event_rp0*)meta_evt->data;
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if(evt_le_phy_update_complete->Status) {
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FURI_LOG_E(
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TAG, "Update PHY failed, status %d", evt_le_phy_update_complete->Status);
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} else {
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FURI_LOG_I(TAG, "Update PHY succeed");
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}
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ret = hci_le_read_phy(gap->service.connection_handle, &tx_phy, &rx_phy);
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if(ret) {
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FURI_LOG_E(TAG, "Read PHY failed, status: %d", ret);
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} else {
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FURI_LOG_I(TAG, "PHY Params TX = %d, RX = %d ", tx_phy, rx_phy);
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}
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break;
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case HCI_LE_CONNECTION_COMPLETE_SUBEVT_CODE: {
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hci_le_connection_complete_event_rp0* event =
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(hci_le_connection_complete_event_rp0*)meta_evt->data;
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gap->connection_params.conn_interval = event->Conn_Interval;
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gap->connection_params.slave_latency = event->Conn_Latency;
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gap->connection_params.supervisor_timeout = event->Supervision_Timeout;
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// Stop advertising as connection completed
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furi_timer_stop(gap->advertise_timer);
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// Update connection status and handle
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gap->state = GapStateConnected;
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gap->service.connection_handle = event->Connection_Handle;
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gap_verify_connection_parameters(gap);
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// Save rssi for current connection
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fetch_rssi();
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// Start pairing by sending security request
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aci_gap_slave_security_req(event->Connection_Handle);
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} break;
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default:
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break;
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}
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break;
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case HCI_VENDOR_SPECIFIC_DEBUG_EVT_CODE:
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blue_evt = (evt_blecore_aci*)event_pckt->data;
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switch(blue_evt->ecode) {
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aci_gap_pairing_complete_event_rp0* pairing_complete;
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case ACI_GAP_LIMITED_DISCOVERABLE_VSEVT_CODE:
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FURI_LOG_I(TAG, "Limited discoverable event");
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break;
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case ACI_GAP_PASS_KEY_REQ_VSEVT_CODE: {
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// Generate random PIN code
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uint32_t pin = rand() % 999999; //-V1064
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aci_gap_pass_key_resp(gap->service.connection_handle, pin);
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if(furi_hal_rtc_is_flag_set(FuriHalRtcFlagLock)) {
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FURI_LOG_I(TAG, "Pass key request event. Pin: ******");
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} else {
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FURI_LOG_I(TAG, "Pass key request event. Pin: %06ld", pin);
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}
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GapEvent event = {.type = GapEventTypePinCodeShow, .data.pin_code = pin};
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gap->on_event_cb(event, gap->context);
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} break;
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case ACI_ATT_EXCHANGE_MTU_RESP_VSEVT_CODE: {
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aci_att_exchange_mtu_resp_event_rp0* pr = (void*)blue_evt->data;
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FURI_LOG_I(TAG, "Rx MTU size: %d", pr->Server_RX_MTU);
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// Set maximum packet size given header size is 3 bytes
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GapEvent event = {
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.type = GapEventTypeUpdateMTU, .data.max_packet_size = pr->Server_RX_MTU - 3};
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gap->on_event_cb(event, gap->context);
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} break;
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case ACI_GAP_AUTHORIZATION_REQ_VSEVT_CODE:
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FURI_LOG_D(TAG, "Authorization request event");
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break;
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case ACI_GAP_SLAVE_SECURITY_INITIATED_VSEVT_CODE:
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FURI_LOG_D(TAG, "Slave security initiated");
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break;
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case ACI_GAP_BOND_LOST_VSEVT_CODE:
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FURI_LOG_D(TAG, "Bond lost event. Start rebonding");
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aci_gap_allow_rebond(gap->service.connection_handle);
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break;
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case ACI_GAP_ADDR_NOT_RESOLVED_VSEVT_CODE:
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FURI_LOG_D(TAG, "Address not resolved event");
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break;
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case ACI_GAP_KEYPRESS_NOTIFICATION_VSEVT_CODE:
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FURI_LOG_D(TAG, "Key press notification event");
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break;
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case ACI_GAP_NUMERIC_COMPARISON_VALUE_VSEVT_CODE: {
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uint32_t pin =
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((aci_gap_numeric_comparison_value_event_rp0*)(blue_evt->data))->Numeric_Value;
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FURI_LOG_I(TAG, "Verify numeric comparison: %06lu", pin);
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GapEvent event = {.type = GapEventTypePinCodeVerify, .data.pin_code = pin};
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bool result = gap->on_event_cb(event, gap->context);
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aci_gap_numeric_comparison_value_confirm_yesno(gap->service.connection_handle, result);
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break;
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}
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case ACI_GAP_PAIRING_COMPLETE_VSEVT_CODE:
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pairing_complete = (aci_gap_pairing_complete_event_rp0*)blue_evt->data;
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if(pairing_complete->Status) {
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FURI_LOG_E(
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TAG,
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"Pairing failed with status: %d. Terminating connection",
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pairing_complete->Status);
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aci_gap_terminate(gap->service.connection_handle, 5);
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} else {
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// Save RSSI
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fetch_rssi();
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FURI_LOG_I(TAG, "Pairing complete");
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GapEvent event = {.type = GapEventTypeConnected};
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gap->on_event_cb(event, gap->context); //-V595
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}
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break;
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case ACI_L2CAP_CONNECTION_UPDATE_RESP_VSEVT_CODE:
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FURI_LOG_D(TAG, "Procedure complete event");
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break;
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case ACI_L2CAP_CONNECTION_UPDATE_REQ_VSEVT_CODE: {
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uint16_t result =
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((aci_l2cap_connection_update_resp_event_rp0*)(blue_evt->data))->Result;
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if(result == 0) {
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FURI_LOG_D(TAG, "Connection parameters accepted");
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} else if(result == 1) {
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FURI_LOG_D(TAG, "Connection parameters denied");
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}
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break;
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}
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}
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default:
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break;
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}
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if(gap) {
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furi_mutex_release(gap->state_mutex);
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}
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return SVCCTL_UserEvtFlowEnable;
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}
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static void set_advertisment_service_uid(uint8_t* uid, uint8_t uid_len) {
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if(uid_len == 2) {
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gap->service.adv_svc_uuid[0] = AD_TYPE_16_BIT_SERV_UUID;
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} else if(uid_len == 4) {
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gap->service.adv_svc_uuid[0] = AD_TYPE_32_BIT_SERV_UUID;
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} else if(uid_len == 16) {
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gap->service.adv_svc_uuid[0] = AD_TYPE_128_BIT_SERV_UUID_CMPLT_LIST;
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}
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memcpy(&gap->service.adv_svc_uuid[gap->service.adv_svc_uuid_len], uid, uid_len);
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gap->service.adv_svc_uuid_len += uid_len;
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}
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static void gap_init_svc(Gap* gap) {
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tBleStatus status;
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uint32_t srd_bd_addr[2];
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// Configure mac address
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aci_hal_write_config_data(
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CONFIG_DATA_PUBADDR_OFFSET, CONFIG_DATA_PUBADDR_LEN, gap->config->mac_address);
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/* Static random Address
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* The two upper bits shall be set to 1
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* The lowest 32bits is read from the UDN to differentiate between devices
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* The RNG may be used to provide a random number on each power on
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*/
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srd_bd_addr[1] = 0x0000ED6E;
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srd_bd_addr[0] = LL_FLASH_GetUDN();
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aci_hal_write_config_data(
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CONFIG_DATA_RANDOM_ADDRESS_OFFSET, CONFIG_DATA_RANDOM_ADDRESS_LEN, (uint8_t*)srd_bd_addr);
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// Set Identity root key used to derive LTK and CSRK
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aci_hal_write_config_data(CONFIG_DATA_IR_OFFSET, CONFIG_DATA_IR_LEN, (uint8_t*)gap_irk);
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// Set Encryption root key used to derive LTK and CSRK
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aci_hal_write_config_data(CONFIG_DATA_ER_OFFSET, CONFIG_DATA_ER_LEN, (uint8_t*)gap_erk);
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// Set TX Power to 0 dBm
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aci_hal_set_tx_power_level(1, 0x19);
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// Initialize GATT interface
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aci_gatt_init();
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// Initialize GAP interface
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// Skip first symbol AD_TYPE_COMPLETE_LOCAL_NAME
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char* name = gap->service.adv_name + 1;
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aci_gap_init(
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GAP_PERIPHERAL_ROLE,
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0,
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strlen(name),
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&gap->service.gap_svc_handle,
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&gap->service.dev_name_char_handle,
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&gap->service.appearance_char_handle);
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// Set GAP characteristics
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status = aci_gatt_update_char_value(
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gap->service.gap_svc_handle,
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gap->service.dev_name_char_handle,
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0,
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strlen(name),
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(uint8_t*)name);
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if(status) {
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FURI_LOG_E(TAG, "Failed updating name characteristic: %d", status);
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}
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uint8_t gap_appearence_char_uuid[2] = {
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gap->config->appearance_char & 0xff, gap->config->appearance_char >> 8};
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status = aci_gatt_update_char_value(
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gap->service.gap_svc_handle,
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gap->service.appearance_char_handle,
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0,
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2,
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gap_appearence_char_uuid);
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if(status) {
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FURI_LOG_E(TAG, "Failed updating appearence characteristic: %d", status);
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}
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// Set default PHY
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hci_le_set_default_phy(ALL_PHYS_PREFERENCE, TX_2M_PREFERRED, RX_2M_PREFERRED);
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// Set I/O capability
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bool keypress_supported = false;
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// New things below
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uint8_t conf_mitm = CFG_MITM_PROTECTION;
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uint8_t conf_used_fixed_pin = CFG_USED_FIXED_PIN;
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bool conf_bonding = gap->config->bonding_mode;
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if(gap->config->pairing_method == GapPairingPinCodeShow) {
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aci_gap_set_io_capability(IO_CAP_DISPLAY_ONLY);
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} else if(gap->config->pairing_method == GapPairingPinCodeVerifyYesNo) {
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aci_gap_set_io_capability(IO_CAP_DISPLAY_YES_NO);
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keypress_supported = true;
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} else if(gap->config->pairing_method == GapPairingNone) {
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// Just works pairing method (IOS accept it, it seems android and linux doesn't)
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conf_mitm = 0;
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conf_used_fixed_pin = 0;
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conf_bonding = false;
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// if just works isn't supported, we want the numeric comparaison method
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aci_gap_set_io_capability(IO_CAP_DISPLAY_YES_NO);
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keypress_supported = true;
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}
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// Setup authentication
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aci_gap_set_authentication_requirement(
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conf_bonding,
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conf_mitm,
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CFG_SC_SUPPORT,
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keypress_supported,
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CFG_ENCRYPTION_KEY_SIZE_MIN,
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CFG_ENCRYPTION_KEY_SIZE_MAX,
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conf_used_fixed_pin, // 0x0 for no pin
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0,
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CFG_IDENTITY_ADDRESS);
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// Configure whitelist
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aci_gap_configure_whitelist();
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}
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static void gap_advertise_start(GapState new_state) {
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tBleStatus status;
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uint16_t min_interval;
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uint16_t max_interval;
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if(new_state == GapStateAdvFast) {
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min_interval = 0x80; // 80 ms
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max_interval = 0xa0; // 100 ms
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} else {
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min_interval = 0x0640; // 1 s
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max_interval = 0x0fa0; // 2.5 s
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}
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// Stop advertising timer
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furi_timer_stop(gap->advertise_timer);
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if((new_state == GapStateAdvLowPower) &&
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((gap->state == GapStateAdvFast) || (gap->state == GapStateAdvLowPower))) {
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// Stop advertising
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status = aci_gap_set_non_discoverable();
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if(status) {
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FURI_LOG_E(TAG, "set_non_discoverable failed %d", status);
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} else {
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FURI_LOG_D(TAG, "set_non_discoverable success");
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}
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}
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// Configure advertising
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status = aci_gap_set_discoverable(
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ADV_IND,
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min_interval,
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max_interval,
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CFG_IDENTITY_ADDRESS,
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0,
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strlen(gap->service.adv_name),
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(uint8_t*)gap->service.adv_name,
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gap->service.adv_svc_uuid_len,
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gap->service.adv_svc_uuid,
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0,
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|
0);
|
|
if(status) {
|
|
FURI_LOG_E(TAG, "set_discoverable failed %d", status);
|
|
}
|
|
gap->state = new_state;
|
|
GapEvent event = {.type = GapEventTypeStartAdvertising};
|
|
gap->on_event_cb(event, gap->context);
|
|
furi_timer_start(gap->advertise_timer, INITIAL_ADV_TIMEOUT);
|
|
}
|
|
|
|
static void gap_advertise_stop() {
|
|
tBleStatus ret;
|
|
if(gap->state > GapStateIdle) {
|
|
if(gap->state == GapStateConnected) {
|
|
// Terminate connection
|
|
ret = aci_gap_terminate(gap->service.connection_handle, 0x13);
|
|
if(ret != BLE_STATUS_SUCCESS) {
|
|
FURI_LOG_E(TAG, "terminate failed %d", ret);
|
|
} else {
|
|
FURI_LOG_D(TAG, "terminate success");
|
|
}
|
|
}
|
|
// Stop advertising
|
|
furi_timer_stop(gap->advertise_timer);
|
|
ret = aci_gap_set_non_discoverable();
|
|
if(ret != BLE_STATUS_SUCCESS) {
|
|
FURI_LOG_E(TAG, "set_non_discoverable failed %d", ret);
|
|
} else {
|
|
FURI_LOG_D(TAG, "set_non_discoverable success");
|
|
}
|
|
gap->state = GapStateIdle;
|
|
}
|
|
GapEvent event = {.type = GapEventTypeStopAdvertising};
|
|
gap->on_event_cb(event, gap->context);
|
|
}
|
|
|
|
void gap_start_advertising() {
|
|
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
|
|
if(gap->state == GapStateIdle) {
|
|
gap->state = GapStateStartingAdv;
|
|
FURI_LOG_I(TAG, "Start advertising");
|
|
gap->enable_adv = true;
|
|
GapCommand command = GapCommandAdvFast;
|
|
furi_check(furi_message_queue_put(gap->command_queue, &command, 0) == FuriStatusOk);
|
|
}
|
|
furi_mutex_release(gap->state_mutex);
|
|
}
|
|
|
|
void gap_stop_advertising() {
|
|
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
|
|
if(gap->state > GapStateIdle) {
|
|
FURI_LOG_I(TAG, "Stop advertising");
|
|
gap->enable_adv = false;
|
|
GapCommand command = GapCommandAdvStop;
|
|
furi_check(furi_message_queue_put(gap->command_queue, &command, 0) == FuriStatusOk);
|
|
}
|
|
furi_mutex_release(gap->state_mutex);
|
|
}
|
|
|
|
static void gap_advertise_timer_callback(void* context) {
|
|
UNUSED(context);
|
|
GapCommand command = GapCommandAdvLowPower;
|
|
furi_check(furi_message_queue_put(gap->command_queue, &command, 0) == FuriStatusOk);
|
|
}
|
|
|
|
bool gap_init(GapConfig* config, GapEventCallback on_event_cb, void* context) {
|
|
if(!ble_glue_is_radio_stack_ready()) {
|
|
return false;
|
|
}
|
|
|
|
gap = malloc(sizeof(Gap));
|
|
gap->config = config;
|
|
// Create advertising timer
|
|
gap->advertise_timer = furi_timer_alloc(gap_advertise_timer_callback, FuriTimerTypeOnce, NULL);
|
|
// Initialization of GATT & GAP layer
|
|
gap->service.adv_name = config->adv_name;
|
|
gap_init_svc(gap);
|
|
// Initialization of the BLE Services
|
|
SVCCTL_Init();
|
|
// Initialization of the GAP state
|
|
gap->state_mutex = furi_mutex_alloc(FuriMutexTypeNormal);
|
|
gap->state = GapStateIdle;
|
|
gap->service.connection_handle = 0xFFFF;
|
|
gap->enable_adv = true;
|
|
|
|
gap->conn_rssi = 127;
|
|
gap->time_rssi_sample = 0;
|
|
|
|
// Thread configuration
|
|
gap->thread = furi_thread_alloc_ex("BleGapDriver", 1024, gap_app, gap);
|
|
furi_thread_start(gap->thread);
|
|
|
|
// Command queue allocation
|
|
gap->command_queue = furi_message_queue_alloc(8, sizeof(GapCommand));
|
|
|
|
uint8_t adv_service_uid[2];
|
|
gap->service.adv_svc_uuid_len = 1;
|
|
adv_service_uid[0] = gap->config->adv_service_uuid & 0xff;
|
|
adv_service_uid[1] = gap->config->adv_service_uuid >> 8;
|
|
set_advertisment_service_uid(adv_service_uid, sizeof(adv_service_uid));
|
|
|
|
// Set callback
|
|
gap->on_event_cb = on_event_cb;
|
|
gap->context = context;
|
|
return true;
|
|
}
|
|
|
|
// Get RSSI
|
|
uint32_t gap_get_remote_conn_rssi(int8_t* rssi) {
|
|
if(gap && gap->state == GapStateConnected) {
|
|
fetch_rssi();
|
|
*rssi = gap->conn_rssi;
|
|
|
|
if(gap->time_rssi_sample) return furi_get_tick() - gap->time_rssi_sample;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
GapState gap_get_state() {
|
|
GapState state;
|
|
if(gap) {
|
|
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
|
|
state = gap->state;
|
|
furi_mutex_release(gap->state_mutex);
|
|
} else {
|
|
state = GapStateUninitialized;
|
|
}
|
|
return state;
|
|
}
|
|
|
|
void gap_thread_stop() {
|
|
if(gap) {
|
|
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
|
|
gap->enable_adv = false;
|
|
GapCommand command = GapCommandKillThread;
|
|
furi_message_queue_put(gap->command_queue, &command, FuriWaitForever);
|
|
furi_mutex_release(gap->state_mutex);
|
|
furi_thread_join(gap->thread);
|
|
furi_thread_free(gap->thread);
|
|
// Free resources
|
|
furi_mutex_free(gap->state_mutex);
|
|
furi_message_queue_free(gap->command_queue);
|
|
furi_timer_stop(gap->advertise_timer);
|
|
while(xTimerIsTimerActive(gap->advertise_timer) == pdTRUE) furi_delay_tick(1);
|
|
furi_timer_free(gap->advertise_timer);
|
|
free(gap);
|
|
gap = NULL;
|
|
}
|
|
}
|
|
|
|
static int32_t gap_app(void* context) {
|
|
UNUSED(context);
|
|
GapCommand command;
|
|
while(1) {
|
|
FuriStatus status = furi_message_queue_get(gap->command_queue, &command, FuriWaitForever);
|
|
if(status != FuriStatusOk) {
|
|
FURI_LOG_E(TAG, "Message queue get error: %d", status);
|
|
continue;
|
|
}
|
|
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
|
|
if(command == GapCommandKillThread) {
|
|
break;
|
|
}
|
|
if(command == GapCommandAdvFast) {
|
|
gap_advertise_start(GapStateAdvFast);
|
|
} else if(command == GapCommandAdvLowPower) {
|
|
gap_advertise_start(GapStateAdvLowPower);
|
|
} else if(command == GapCommandAdvStop) {
|
|
gap_advertise_stop();
|
|
}
|
|
furi_mutex_release(gap->state_mutex);
|
|
}
|
|
|
|
return 0;
|
|
}
|