// Initialize "qrCode" according to "numInputBytes", "ecLevel", and "mode". On success, modify
// "qrCode".
private static void initQRCode(int numInputBytes, ErrorCorrectionLevel ecLevel, Mode mode, QRCode qrCode)
{
try
{
qrCode.setECLevel(ecLevel);
qrCode.setMode(mode);
// In the following comments, we use numbers of Version 7-H.
for (int versionNum = 1; versionNum <= 40; versionNum++)
{
Version version = Version.getVersionForNumber(versionNum);
// numBytes = 196
int numBytes = version.getTotalCodewords();
// getNumECBytes = 130
Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
int numEcBytes = ecBlocks.getTotalECCodewords();
// getNumRSBlocks = 5
int numRSBlocks = ecBlocks.getNumBlocks();
// getNumDataBytes = 196 - 130 = 66
int numDataBytes = numBytes - numEcBytes;
// We want to choose the smallest version which can contain data of "numInputBytes" + some
// extra bits for the header (mode info and length info). The header can be three bytes
// (precisely 4 + 16 bits) at most. Hence we do +3 here.
if (numDataBytes >= numInputBytes + 3)
{
// Yay, we found the proper rs block info!
qrCode.setVersion(versionNum);
qrCode.setNumTotalBytes(numBytes);
qrCode.setNumDataBytes(numDataBytes);
qrCode.setNumRSBlocks(numRSBlocks);
// getNumECBytes = 196 - 66 = 130
qrCode.setNumECBytes(numEcBytes);
// matrix width = 21 + 6 * 4 = 45
qrCode.setMatrixWidth(version.getDimensionForVersion());
return;
}
}
throw new WriterException("Cannot find proper rs block info (input data too big?)");
}
catch (Exception e) {
throw new WriterException(e.Message);
}
}
// Initialize "qrCode" according to "numInputBytes", "ecLevel", and "mode". On success, modify
// "qrCode".
private static void initQRCode(int numInputBytes, ErrorCorrectionLevel ecLevel, Mode mode, QRCode qrCode)
{
try
{
qrCode.setECLevel(ecLevel);
qrCode.setMode(mode);
// In the following comments, we use numbers of Version 7-H.
for (int versionNum = 1; versionNum <= 40; versionNum++) {
Version version = Version.getVersionForNumber(versionNum);
// numBytes = 196
int numBytes = version.getTotalCodewords();
// getNumECBytes = 130
Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
int numEcBytes = ecBlocks.getTotalECCodewords();
// getNumRSBlocks = 5
int numRSBlocks = ecBlocks.getNumBlocks();
// getNumDataBytes = 196 - 130 = 66
int numDataBytes = numBytes - numEcBytes;
// We want to choose the smallest version which can contain data of "numInputBytes" + some
// extra bits for the header (mode info and length info). The header can be three bytes
// (precisely 4 + 16 bits) at most. Hence we do +3 here.
if (numDataBytes >= numInputBytes + 3) {
// Yay, we found the proper rs block info!
qrCode.setVersion(versionNum);
qrCode.setNumTotalBytes(numBytes);
qrCode.setNumDataBytes(numDataBytes);
qrCode.setNumRSBlocks(numRSBlocks);
// getNumECBytes = 196 - 66 = 130
qrCode.setNumECBytes(numEcBytes);
// matrix width = 21 + 6 * 4 = 45
qrCode.setMatrixWidth(version.getDimensionForVersion());
return;
}
}
throw new WriterException("Cannot find proper rs block info (input data too big?)");
}
catch(Exception e){
throw new WriterException(e.Message);
}
}
