/// <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;
}
/**
* <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();
}
