/**
* Reads version information from one of its two locations within the QR Code.
*
* @return {@link Version} encapsulating the QR Code's version
* @throws com.application.food.zxing.FormatException if both version information locations cannot
* be parsed as the valid encoding of version information
*/
Version readVersion() throws FormatException {
if (parsedVersion != null) {
return parsedVersion;
}
int dimension = bitMatrix.getHeight();
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.getDimensionForVersion() == 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.getDimensionForVersion() == dimension) {
parsedVersion = theParsedVersion;
return theParsedVersion;
}
throw FormatException.getFormatInstance();
}
