/*
 * Generic uart / rs232/ serial port library
 *
 * Copyright (c) 2013, Roel Verdult
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @file uart_win32.c
 *
 * Note: the win32 version of this library has also been seen under the GPLv3+
 * license as part of the libnfc project, which appears to have additional
 * contributors.
 *
 * This version of the library has functionality removed which was not used by
 * proxmark3 project.
 */

#include "uart.h"

// The windows serial port implementation
#ifdef _WIN32
#include <windows.h>

typedef struct {
    HANDLE hPort;     // Serial port handle
    DCB dcb;          // Device control settings
    COMMTIMEOUTS ct;  // Serial port time-out configuration
} serial_port_windows;

int uart_reconfigure_timeouts(serial_port sp, uint32_t value) {
    serial_port_windows *spw;
    spw = (serial_port_windows *)sp;
    spw->ct.ReadIntervalTimeout         = value;
    spw->ct.ReadTotalTimeoutMultiplier  = 0;
    spw->ct.ReadTotalTimeoutConstant    = value;
    spw->ct.WriteTotalTimeoutMultiplier = value;
    spw->ct.WriteTotalTimeoutConstant   = 0;

    if (!SetCommTimeouts(spw->hPort, &spw->ct)) {
        uart_close(spw);
        return PM3_EIO;
    }

    PurgeComm(spw->hPort, PURGE_RXABORT | PURGE_RXCLEAR);
    return PM3_SUCCESS;
}

serial_port uart_open(const char *pcPortName, uint32_t speed) {
    char acPortName[255] = {0};
    serial_port_windows *sp = calloc(sizeof(serial_port_windows), sizeof(uint8_t));

    if (sp == 0) {
        printf("[!] UART failed to allocate memory\n");
        return INVALID_SERIAL_PORT;
    }
    // Copy the input "com?" to "\\.\COM?" format
    sprintf(acPortName, "\\\\.\\%s", pcPortName);
    _strupr(acPortName);

    // Try to open the serial port
    // r/w,  none-share comport, no security, existing, no overlapping, no templates
    sp->hPort = CreateFileA(acPortName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    if (sp->hPort == INVALID_HANDLE_VALUE) {
        uart_close(sp);
        return INVALID_SERIAL_PORT;
    }

    // Prepare the device control
    // doesn't matter since PM3 device ignors this CDC command:  set_line_coding in usb_cdc.c
    memset(&sp->dcb, 0, sizeof(DCB));
    sp->dcb.DCBlength = sizeof(DCB);
    if (!BuildCommDCBA("baud=115200 parity=N data=8 stop=1", &sp->dcb)) {
        uart_close(sp);
        printf("[!] UART error cdc setup\n");
        return INVALID_SERIAL_PORT;
    }

    // Update the active serial port
    if (!SetCommState(sp->hPort, &sp->dcb)) {
        uart_close(sp);
        printf("[!] UART error while setting com state\n");
        return INVALID_SERIAL_PORT;
    }

    uart_reconfigure_timeouts(sp, UART_FPC_CLIENT_RX_TIMEOUT_MS);

    if (!uart_set_speed(sp, speed)) {
        // trying some fallbacks automatically
        speed = 115200;
        if (!uart_set_speed(sp, speed)) {
            speed = 9600;
            if (!uart_set_speed(sp, speed)) {
                uart_close(sp);
                printf("[!] UART error while setting baudrate\n");
                return INVALID_SERIAL_PORT;
            }
        }
    }
    conn.uart_speed = uart_get_speed(sp);
    return sp;
}

void uart_close(const serial_port sp) {
    if (((serial_port_windows *)sp)->hPort != INVALID_HANDLE_VALUE)
        CloseHandle(((serial_port_windows *)sp)->hPort);
    free(sp);
}

bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
    serial_port_windows *spw;

    // Set port speed (Input and Output)
    switch (uiPortSpeed) {
        case 9600:
        case 19200:
        case 38400:
        case 57600:
        case 115200:
        case 230400:
        case 460800:
            break;
        default:
            return false;
    };

    spw = (serial_port_windows *)sp;
    spw->dcb.BaudRate = uiPortSpeed;
    bool result = SetCommState(spw->hPort, &spw->dcb);
    PurgeComm(spw->hPort, PURGE_RXABORT | PURGE_RXCLEAR);
    if (result)
        conn.uart_speed = uiPortSpeed;

    return result;
}

uint32_t uart_get_speed(const serial_port sp) {
    const serial_port_windows *spw = (serial_port_windows *)sp;
    if (!GetCommState(spw->hPort, (serial_port) & spw->dcb))
        return spw->dcb.BaudRate;

    return 0;
}

bool uart_receive(const serial_port sp, uint8_t *pbtRx, uint32_t pszMaxRxLen, uint32_t *pszRxLen) {
    return ReadFile(((serial_port_windows *)sp)->hPort, pbtRx, pszMaxRxLen, (LPDWORD)pszRxLen, NULL);
}

bool uart_send(const serial_port sp, const uint8_t *p_tx, const uint32_t len) {
    DWORD txlen = 0;
    return WriteFile(((serial_port_windows *)sp)->hPort, p_tx, len, &txlen, NULL);
}

#endif