/// <summary> Append length info. On success, store the result in "bits".</summary>
internal static void appendLengthInfo(int numLetters, int version, Mode mode, BitVector bits)
{
int numBits = mode.getCharacterCountBits(Version.getVersionForNumber(version));
if (numLetters > ((1 << numBits) - 1))
{
throw new WriterException(numLetters + "is bigger than" + ((1 << numBits) - 1));
}
bits.appendBits(numLetters, numBits);
}
private static string ECBlocksToString(VersionZX.ECBlocks ecBlocks)
{
VersionZX.ECB[] ecBlock = ecBlocks.getECBlocks();
string returnValue = "";
foreach(VersionZX.ECB ecb in ecBlock)
{
returnValue = string.Join(s_Separator, returnValue, ecb.Count, ecb.DataCodewords);
}
return returnValue;
}
/// <summary> Initialize "QRCodeInternal" according to "numInputBytes", "m_EcLevelInternal", and "mode". On success,
/// modify "QRCodeInternal".
/// </summary>
internal static void initQRCode(int numInputBytes, ErrorCorrectionLevelInternal m_EcLevelInternal, Mode mode, QRCodeInternal qrCodeInternal)
{
qrCodeInternal.EcLevelInternal = m_EcLevelInternal;
qrCodeInternal.Mode = 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.TotalCodewords;
// getNumECBytes = 130
Version.ECBlocks ecBlocks = version.getECBlocksForLevel(m_EcLevelInternal);
int numEcBytes = ecBlocks.TotalECCodewords;
// getNumRSBlocks = 5
int numRSBlocks = ecBlocks.NumBlocks;
// 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!
qrCodeInternal.Version = versionNum;
qrCodeInternal.NumTotalBytes = numBytes;
qrCodeInternal.NumDataBytes = numDataBytes;
qrCodeInternal.NumRSBlocks = numRSBlocks;
// getNumECBytes = 196 - 66 = 130
qrCodeInternal.NumECBytes = numEcBytes;
// matrix width = 21 + 6 * 4 = 45
qrCodeInternal.MatrixWidth = version.DimensionForVersion;
return;
}
}
throw new WriterException("Cannot find proper rs block info (input data too big?)");
}
/**
* <p>Reads version information from one of its two locations within the QR Code.</p>
*
* @return {@link Version} encapsulating the QR Code's version
* @throws ReaderException if both version information locations cannot be parsed as
* the valid encoding of version information
*/
public Version readVersion(){
if (parsedVersion != null) {
return parsedVersion;
}
int dimension = bitMatrix.getDimension();
int provisionalVersion = (dimension - 17) >> 2;
if (provisionalVersion <= 6) {
return Version.getVersionForNumber(provisionalVersion);
}
// Read top-right version info: 3 wide by 6 tall
int versionBits = 0;
for (int i = 5; i >= 0; i--) {
int jMin = dimension - 11;
for (int j = dimension - 9; j >= jMin; j--) {
versionBits = copyBit(i, j, versionBits);
}
}
parsedVersion = Version.decodeVersionInformation(versionBits);
if (parsedVersion != null) {
return parsedVersion;
}
// Hmm, failed. Try bottom left: 6 wide by 3 tall
versionBits = 0;
for (int j = 5; j >= 0; j--) {
int iMin = dimension - 11;
for (int i = dimension - 11; i >= iMin; i--) {
versionBits = copyBit(i, j, versionBits);
}
}
parsedVersion = Version.decodeVersionInformation(versionBits);
if (parsedVersion != null) {
return parsedVersion;
}
throw new ReaderException();
}
/// <summary>
/// <p>Reads version information from one of its two locations within the QR Code.</p>
/// </summary>
/// <returns> <seealso cref="Version"/> encapsulating the QR Code's version </returns>
/// <exception cref="FormatException"> if both version information locations cannot be parsed as
/// the valid encoding of version information </exception>
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: Version readVersion() throws com.google.zxing.FormatException
internal Version readVersion()
{
if (parsedVersion != null)
{
return parsedVersion;
}
int dimension = bitMatrix.Height;
int provisionalVersion = (dimension - 17) >> 2;
if (provisionalVersion <= 6)
{
return Version.getVersionForNumber(provisionalVersion);
}
// Read top-right version info: 3 wide by 6 tall
int versionBits = 0;
int ijMin = dimension - 11;
for (int j = 5; j >= 0; j--)
{
for (int i = dimension - 9; i >= ijMin; i--)
{
versionBits = copyBit(i, j, versionBits);
}
}
Version theParsedVersion = Version.decodeVersionInformation(versionBits);
if (theParsedVersion != null && theParsedVersion.DimensionForVersion == dimension)
{
parsedVersion = theParsedVersion;
return theParsedVersion;
}
// Hmm, failed. Try bottom left: 6 wide by 3 tall
versionBits = 0;
for (int i = 5; i >= 0; i--)
{
for (int j = dimension - 9; j >= ijMin; j--)
{
versionBits = copyBit(i, j, versionBits);
}
}
theParsedVersion = Version.decodeVersionInformation(versionBits);
if (theParsedVersion != null && theParsedVersion.DimensionForVersion == dimension)
{
parsedVersion = theParsedVersion;
return theParsedVersion;
}
throw FormatException.FormatInstance;
}
