public QRPolynomial Multiply(QRPolynomial e)
{
var num = new DataCache(this.GetLength() + e.GetLength() - 1);
for (int i = 0; i < this.GetLength(); i++)
{
for (int j = 0; j < e.GetLength(); j++)
{
num[i + j] ^= QRMath.GExp(QRMath.GLog(this.Get(i)) + QRMath.GLog(e.Get(j)));
}
}
return(new QRPolynomial(num, 0));
}
internal static QRPolynomial GetErrorCorrectPolynomial(int errorCorrectLength)
{
QRPolynomial a = new QRPolynomial(new DataCache()
{
1
}, 0);
for (int i = 0; i < errorCorrectLength; i++)
{
a = a.Multiply(new QRPolynomial(new DataCache()
{
1, QRMath.GExp(i)
}, 0));
}
return(a);
}
public QRPolynomial Mod(QRPolynomial e)
{
if (Convert.ToInt64(this.GetLength()) - Convert.ToInt64(e.GetLength()) < 0)
{
return(this);
}
int ratio = QRMath.GLog(this.Get(0)) - QRMath.GLog(e.Get(0));
var num = new DataCache(this.GetLength());
for (int i = 0; i < this.GetLength(); i++)
{
num[i] = this.Get(i);
}
for (int i = 0; i < e.GetLength(); i++)
{
num[i] ^= QRMath.GExp(QRMath.GLog(e.Get(i)) + ratio);
}
// recursive call
return(new QRPolynomial(num, 0).Mod(e));
}
private DataCache CreateBytes(QRBitBuffer buffer, List <QRRSBlock> rsBlocks)
{
int offset = 0;
int maxDcCount = 0;
int maxEcCount = 0;
var dcdata = new DataCache[(rsBlocks.Count)];
var ecdata = new DataCache[(rsBlocks.Count)];
for (int r = 0; r < rsBlocks.Count; r++)
{
int dcCount = rsBlocks[(int)r].DataCount;
int ecCount = rsBlocks[(int)r].TotalCount - dcCount;
maxDcCount = Math.Max(maxDcCount, dcCount);
maxEcCount = Math.Max(maxEcCount, ecCount);
dcdata[r] = new DataCache(dcCount);
for (int i = 0; i < dcdata[r].Count; i++)
{
dcdata[r][i] = 0xff & buffer.m_buffer[(int)(i + offset)];
}
offset += dcCount;
QRPolynomial rsPoly = QRUtil.GetErrorCorrectPolynomial(ecCount);
QRPolynomial rawPoly = new QRPolynomial(dcdata[r], rsPoly.GetLength() - 1);
var modPoly = rawPoly.Mod(rsPoly);
ecdata[r] = new DataCache(rsPoly.GetLength() - 1);
for (int i = 0; i < ecdata[r].Count; i++)
{
int modIndex = i + modPoly.GetLength() - (int)ecdata[r].Count;
ecdata[r][i] = (modIndex >= 0) ? modPoly.Get(modIndex) : 0;
}
}
int totalCodeCount = 0;
for (int i = 0; i < rsBlocks.Count; i++)
{
totalCodeCount += rsBlocks[(int)i].TotalCount;
}
var data = new DataCache(totalCodeCount);
int index = 0;
for (int i = 0; i < maxDcCount; i++)
{
for (int r = 0; r < rsBlocks.Count; r++)
{
if (i < dcdata[r].Count)
{
data[index++] = dcdata[r][i];
}
}
}
for (int i = 0; i < maxEcCount; i++)
{
for (int r = 0; r < rsBlocks.Count; r++)
{
if (i < ecdata[r].Count)
{
data[index++] = ecdata[r][i];
}
}
}
return(data);
}
