/// <summary>
/// Use number of data bits(header + eci header + data bits from EncoderBase) to search for proper version to use
/// between min and max boundary.
/// Boundary define by DynamicSearchIndicator method.
/// </summary>
/// <param name="numDataBits">The num data bits.</param>
/// <param name="level">The level.</param>
/// <param name="lowerVersionNum">The lower version num.</param>
/// <param name="higherVersionNum">The higher version num.</param>
/// <returns></returns>
/// <remarks></remarks>
private static int BinarySearch(int numDataBits, ErrorCorrectionLevel level, int lowerVersionNum,
int higherVersionNum)
{
int middleVersionNumber;
while (lowerVersionNum <= higherVersionNum)
{
middleVersionNumber = (lowerVersionNum + higherVersionNum) / 2;
QRCodeVersion version = VersionTable.GetVersionByNum(middleVersionNumber);
int numECCodewords = version.GetECBlocksByLevel(level).NumErrorCorrectionCodewards;
int dataCodewords = version.TotalCodewords - numECCodewords;
if (dataCodewords << 3 == numDataBits)
{
return(middleVersionNumber);
}
if (dataCodewords << 3 > numDataBits)
{
higherVersionNum = middleVersionNumber - 1;
}
else
{
lowerVersionNum = middleVersionNumber + 1;
}
}
return(lowerVersionNum);
}
/// <summary>
/// Decide which version group it belong to
/// </summary>
/// <param name="numBits">number of bits for bitlist where it contain DataBits encode from input content and ECI header</param>
/// <param name="level">Error correction level</param>
/// <param name="mode">Mode</param>
/// <returns>Version group index for VERSION_GROUP</returns>
/// <remarks></remarks>
private static int DynamicSearchIndicator(int numBits, ErrorCorrectionLevel level, Mode mode)
{
int[] charCountIndicator = CharCountIndicatorTable.GetCharCountIndicatorSet(mode);
int totalBits = 0;
int loopLength = VERSION_GROUP.Length;
for (int i = 0; i < loopLength; i++)
{
totalBits = numBits + NUM_BITS_MODE_INDICATOR + charCountIndicator[i];
QRCodeVersion version = VersionTable.GetVersionByNum(VERSION_GROUP[i]);
int numECCodewords = version.GetECBlocksByLevel(level).NumErrorCorrectionCodewards;
int dataCodewords = version.TotalCodewords - numECCodewords;
if (totalBits <= dataCodewords * 8)
{
return(i);
}
}
throw new InputOutOfBoundaryException(string.Format("QRCode do not have enough space for {0} bits",
(numBits + NUM_BITS_MODE_INDICATOR +
charCountIndicator[2])));
}
/// <summary>
/// Fills the VC struct.
/// </summary>
/// <param name="versionNum">The version num.</param>
/// <param name="level">The level.</param>
/// <param name="encodingName">Name of the encoding.</param>
/// <returns></returns>
/// <remarks></remarks>
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));
}
var 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;
var vcDetail = new VersionDetail(version, numTotalBytes, numDataBytes, numECBlocks);
vcStruct.VersionDetail = vcDetail;
return(vcStruct);
}