internal static Polynomial GetErrorCorrectPolynomial(int errorCorrectLength)
{
Polynomial a = new Polynomial(new int[] {1});
for (int i = 0; i < errorCorrectLength; i++) {
a = a.Multiply(new Polynomial(new int[] { 1, QRMath.Gexp(i) }));
}
return a;
}
public Polynomial Mod(Polynomial e)
{
if (GetLength() - e.GetLength() < 0) {
return this;
}
int ratio = QRMath.Glog(Get(0)) - QRMath.Glog(e.Get(0));
int[] num = new int[GetLength()];
for (int i = 0; i < GetLength(); i++) {
num[i] = Get(i);
}
for (int i = 0; i < e.GetLength(); i++) {
num[i] ^= QRMath.Gexp(QRMath.Glog(e.Get(i)) + ratio);
}
return new Polynomial(num).Mod(e);
}
public Polynomial Multiply(Polynomial e)
{
int[] num = new int[GetLength() + e.GetLength() - 1];
for (int i = 0; i < GetLength(); i++) {
for (int j = 0; j < e.GetLength(); j++) {
num[i + j] ^= QRMath.Gexp(QRMath.Glog(Get(i)) + QRMath.Glog(e.Get(j)));
}
}
return new Polynomial(num);
}
private static byte[] CreateBytes(BitBuffer buffer, RSBlock[] rsBlocks)
{
int offset = 0;
int maxDcCount = 0;
int maxEcCount = 0;
int[][] dcdata = new int[rsBlocks.Length][];
int[][] ecdata = new int[rsBlocks.Length][];
for (int r = 0; r < rsBlocks.Length; r++) {
int dcCount = rsBlocks[r].GetDataCount();
int ecCount = rsBlocks[r].GetTotalCount() - dcCount;
maxDcCount = Math.Max(maxDcCount, dcCount);
maxEcCount = Math.Max(maxEcCount, ecCount);
dcdata[r] = new int[dcCount];
for (int i = 0; i < dcdata[r].Length; i++) {
dcdata[r][i] = 0xff & buffer.GetBuffer()[i + offset];
}
offset += dcCount;
Polynomial rsPoly = QRUtil.GetErrorCorrectPolynomial(ecCount);
Polynomial rawPoly = new Polynomial(dcdata[r], rsPoly.GetLength() - 1);
Polynomial modPoly = rawPoly.Mod(rsPoly);
ecdata[r] = new int[rsPoly.GetLength() - 1];
for (int i = 0; i < ecdata[r].Length; i++) {
int modIndex = i + modPoly.GetLength() - ecdata[r].Length;
ecdata[r][i] = (modIndex >= 0)? modPoly.Get(modIndex) : 0;
}
}
int totalCodeCount = 0;
for (int i = 0; i < rsBlocks.Length; i++) {
totalCodeCount += rsBlocks[i].GetTotalCount();
}
byte[] data = new byte[totalCodeCount];
int index = 0;
for (int i = 0; i < maxDcCount; i++) {
for (int r = 0; r < rsBlocks.Length; r++) {
if (i < dcdata[r].Length) {
data[index++] = (byte) dcdata[r][i];
}
}
}
for (int i = 0; i < maxEcCount; i++) {
for (int r = 0; r < rsBlocks.Length; r++) {
if (i < ecdata[r].Length) {
data[index++] = (byte) ecdata[r][i];
}
}
}
return data;
}
