/// <summary>
/// Determine which version to use
/// </summary>
/// <param name="dataBitsLength">Number of bits for encoded content</param>
/// <param name="encodingName">Encoding name for EightBitByte</param>
/// <returns>VersionDetail and ECI</returns>
internal static VersionControlStruct InitialSetup(int dataBitsLength, Mode mode, ErrorCorrectionLevel level, string encodingName)
{
int totalDataBits = dataBitsLength;
bool containECI = false;
BitList eciHeader = new BitList();
//Check ECI header
if (mode == Mode.EightBitByte)
{
if (encodingName != DEFAULT_ENCODING && encodingName != QRCodeConstantVariable.UTF8Encoding)
{
ECISet eciSet = new ECISet(ECISet.AppendOption.NameToValue);
int eciValue = eciSet.GetECIValueByName(encodingName);
totalDataBits += ECISet.NumOfECIHeaderBits(eciValue);
eciHeader = eciSet.GetECIHeader(encodingName);
containECI = true;
}
}
//Determine which version group it belong to
int searchGroup = DynamicSearchIndicator(totalDataBits, level, mode);
int[] charCountIndicator = CharCountIndicatorTable.GetCharCountIndicatorSet(mode);
totalDataBits += (NUM_BITS_MODE_INDICATOR + charCountIndicator[searchGroup]);
int lowerSearchBoundary = searchGroup == 0 ? 1 : (VERSION_GROUP[searchGroup - 1] + 1);
int higherSearchBoundary = VERSION_GROUP[searchGroup];
//Binary search to find proper version
int versionNum = BinarySearch(totalDataBits, level, lowerSearchBoundary, higherSearchBoundary);
VersionControlStruct vcStruct = FillVCStruct(versionNum, level, encodingName);
vcStruct.isContainECI = containECI;
vcStruct.ECIHeader = eciHeader;
return(vcStruct);
}
private static VersionControlStruct FillVCStruct(int versionNum, ErrorCorrectionLevel level, string encodingName)
{
if (versionNum < 1 || versionNum > 40)
{
throw new InvalidOperationException(string.Format("Unexpected version number: {0}", versionNum));
}
VersionControlStruct vcStruct = new VersionControlStruct();
int version = versionNum;
QRCodeVersion versionData = VersionTable.GetVersionByNum(versionNum);
int numTotalBytes = versionData.TotalCodewords;
ErrorCorrectionBlocks ecBlocks = versionData.GetECBlocksByLevel(level);
int numDataBytes = numTotalBytes - ecBlocks.NumErrorCorrectionCodewards;
int numECBlocks = ecBlocks.NumBlocks;
VersionDetail vcDetail = new VersionDetail(version, numTotalBytes, numDataBytes, numECBlocks);
vcStruct.VersionDetail = vcDetail;
return(vcStruct);
}