#include "crc16.h"
#include "ui_crc16.h"

CRC16::CRC16(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::CRC16)
{
    ui->setupUi(this);
    arr[0] = ui->lineByte_0;
    arr[1] = ui->lineByte_1;
    arr[2] = ui->lineByte_2;
    arr[3] = ui->lineByte_3;
    arr[4] = ui->lineByte_4;
    arr[5] = ui->lineByte_5;
    arr[6] = ui->lineByte_6;
    arr[7] = ui->lineByte_7;
}

CRC16::~CRC16()
{
    delete ui;
}

static uint16_t getCRC_MODBUS(QByteArray buf, uint16_t len)
{
    static const uint16_t table[256] = {
    0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
    0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
    0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
    0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
    0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
    0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
    0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
    0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
    0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
    0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
    0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
    0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
    0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
    0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
    0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
    0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
    0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
    0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
    0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
    0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
    0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
    0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
    0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
    0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
    0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
    0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
    0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
    0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
    0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
    0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
    0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
    0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040 };
    uint8_t x_or = 0;
    uint16_t crc = 0xFFFF;
    int i = 0;
    while( len-- )
    {
        x_or = (buf.at(i++)) ^ crc;
        crc >>= 8;
        crc ^= table[x_or];
    }
    return crc;
}

uint16_t getCRC_ARC(QByteArray data, uint16_t size)
{
    uint16_t out = 0;
    int bits_read = 0, bit_flag;
    if(data.size() == NULL)
        return 0;
    int data_i = 0;
    while(size > 0)
    {
        bit_flag = out >> 15;
        out <<= 1;
        out |= (data.at(data_i) >> bits_read) & 1;
        bits_read++;
        if(bits_read > 7)
        {
            bits_read = 0;
            data.at(data_i++);
            size--;
        }
        if(bit_flag)
            out ^= 0x8005;
    }
    int i;
    for (i = 0; i < 16; ++i) {
        bit_flag = out >> 15;
        out <<= 1;
        if(bit_flag)
            out ^= 0x8005;
    }
    uint16_t crc = 0;
    i = 0x8000;
    int j = 0x0001;
    for (; i != 0; i >>=1, j <<= 1) {
        if (i & out) crc |= j;
    }
    return crc;
}

void CRC16::on_buttonShowCRC_clicked()
{
    QByteArray crc;
    for(int i = 0; i < ui->comboCountDLC->currentIndex()+1; i++)
    {
        crc += (BYTE)arr[i]->text().toInt(nullptr, 16);
    }
    ui->lineX25->setText("0x"+QString::number(qChecksum(crc, crc.size()), 16).toUpper());
    ui->lineModbus->setText("0x"+QString::number(getCRC_MODBUS(crc, ui->comboCountDLC->currentIndex()+1), 16).toUpper());
    ui->lineARC->setText("0x"+QString::number(getCRC_ARC(crc, crc.size()), 16).toUpper());
}

void CRC16::on_comboCountDLC_currentIndexChanged(int index)
{
    for(int i = 0; i < 8; i++)
    {
        if(i > (index))
        {
            arr[i]->setEnabled(FALSE);
        }
        else
        {
            arr[i]->setEnabled(TRUE);
        }
    }
}