#include <QFile>
#include <QBitArray>
#include <QDesktopServices>
#include <QUrl>
#include <QSettings>
#include "CVCODEC.H" // The Convolution codec

#define ReadSize 524288 // bytes to read

bool needReverseBytes = true;
bool needDiff = true;

ULONG poly_1 = 0x3c; // == 0111100
ULONG poly_2 = 0x73; // == 1110011

const int MyDataSize = ReadSize / 2;

QFile file("data.raw"); // open input raw data file
if(file.open(QIODevice::ReadOnly))
{
    QFile file_output("result.bin"); // output file
    if(file_output.open(QIODevice::WriteOnly))
    {
        // polynoms
        const ULONG nasa_param[2][1] =
        {
            { poly_1 },
            { poly_2 }
        };

        ConvolutionalCodec<2,1,7,8> TerraCodec(nasa_param); // Convolution codec object
        /*
        Where the template parameters:
            2 - number of output streams
            1 - number of input streams (bits/msg symbol)
            7 - constraint length
            8 - symbols per encoding group
            (I don't know what is it. I tried to change it, but the result does not change)
        */
        const int encodedlen = TerraCodec.getEncodedLength(MyDataSize);

        QByteArray ba = file.read(ReadSize); // read raw data

        if(needReverseBytes)
            reverseBytes(ba); // reverse bits in every byte

        QBitArray bit = bytesToBits(ba); // represent data as bit array
        QBitArray bit_diff(bit.size(), 0);

        // sum mod2
        if(needDiff)
        {
            for(int i=0; i<bit.size()-1; i++ )
                bit_diff[i] = bit[i] ^ bit[i+1];
        }
        else
        {
            for(int i=0; i<bit.size(); i++ )
                bit_diff[i] = bit[i];
        }

        ba = bitsToBytes(bit_diff); // write bits into byte array

        QByteArray decoded(MyDataSize, 0); // byte array for result

        TerraCodec.decode((const UBYTE*)ba.constData(), (UBYTE*)decoded.data(), MyDataSize);

        file_output.write(decoded); // write the result
        file_output.close();

        // Open the result in a default system viewer:
        QDesktopServices::openUrl(QUrl::fromLocalFile(file_output.fileName()));
    }
}