| static private decodeVersionInformation ( int versionBits ) : Version | ||
| versionBits | int | |
| Résultat | Version | |
/// <summary> <p>Reads version information from one of its two locations within the QR Code.</p>
///
/// </summary>
/// <returns> {@link Version} encapsulating the QR Code's version
/// </returns>
/// <throws> ReaderException if both version information locations cannot be parsed as </throws>
/// <summary> the valid encoding of version information
/// </summary>
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);
}
}
parsedVersion = Version.decodeVersionInformation(versionBits);
if (parsedVersion != null && parsedVersion.DimensionForVersion == dimension)
{
return(parsedVersion);
}
// 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);
}
}
parsedVersion = Version.decodeVersionInformation(versionBits);
if (parsedVersion != null && parsedVersion.DimensionForVersion == dimension)
{
return(parsedVersion);
}
return(null);
}
