Ref<Result> UPCEANReader::decodeRow(int rowNumber,
Ref<BitArray> row,
Range const& startGuardRange) {
string& result = decodeRowStringBuffer;
result.clear();
int endStart = decodeMiddle(row, startGuardRange, result);
Range endRange = decodeEnd(row, endStart);
// Make sure there is a quiet zone at least as big as the end pattern after the barcode.
// The spec might want more whitespace, but in practice this is the maximum we can count on.
int end = endRange[1];
int quietEnd = end + (end - endRange[0]);
if (quietEnd >= row->getSize() || !row->isRange(end, quietEnd, false)) {
throw NotFoundException();
}
Ref<String> resultString (new String(result));
if (!checkChecksum(resultString)) {
throw ChecksumException();
}
float left = (float) (startGuardRange[1] + startGuardRange[0]) / 2.0f;
float right = (float) (endRange[1] + endRange[0]) / 2.0f;
BarcodeFormat format = getBarcodeFormat();
ArrayRef< Ref<ResultPoint> > resultPoints(2);
resultPoints[0] = Ref<ResultPoint>(new OneDResultPoint(left, (float) rowNumber));
resultPoints[1] = Ref<ResultPoint>(new OneDResultPoint(right, (float) rowNumber));
Ref<Result> decodeResult (new Result(resultString, ArrayRef<char>(), resultPoints, format));
// Java extension and man stuff
return decodeResult;
}
void Code93Reader::checkOneChecksum(string const& result,
int checkPosition,
int weightMax) {
int weight = 1;
int total = 0;
for (int i = checkPosition - 1; i >= 0; i--) {
total += weight * ALPHABET_STRING.find_first_of(result[i]);
if (++weight > weightMax) {
weight = 1;
}
}
if (result[checkPosition] != ALPHABET[total % 47]) {
throw ChecksumException();
}
}
Ref<Result> Code128Reader::decodeRow(int rowNumber, Ref<BitArray> row) {
// boolean convertFNC1 = hints != null && hints.containsKey(DecodeHintType.ASSUME_GS1);
boolean convertFNC1 = false;
vector<int> startPatternInfo (findStartPattern(row));
int startCode = startPatternInfo[2];
int codeSet;
switch (startCode) {
case CODE_START_A:
codeSet = CODE_CODE_A;
break;
case CODE_START_B:
codeSet = CODE_CODE_B;
break;
case CODE_START_C:
codeSet = CODE_CODE_C;
break;
default:
throw FormatException();
}
bool done = false;
bool isNextShifted = false;
string result;
vector<char> rawCodes(20, 0);
int lastStart = startPatternInfo[0];
int nextStart = startPatternInfo[1];
vector<int> counters (6, 0);
int lastCode = 0;
int code = 0;
int checksumTotal = startCode;
int multiplier = 0;
bool lastCharacterWasPrintable = true;
std::ostringstream oss;
while (!done) {
bool unshift = isNextShifted;
isNextShifted = false;
// Save off last code
lastCode = code;
code = decodeCode(row, counters, nextStart);
// Remember whether the last code was printable or not (excluding CODE_STOP)
if (code != CODE_STOP) {
lastCharacterWasPrintable = true;
}
// Add to checksum computation (if not CODE_STOP of course)
if (code != CODE_STOP) {
multiplier++;
checksumTotal += multiplier * code;
}
// Advance to where the next code will to start
lastStart = nextStart;
for (int i = 0, e = counters.size(); i < e; i++) {
nextStart += counters[i];
}
// Take care of illegal start codes
switch (code) {
case CODE_START_A:
case CODE_START_B:
case CODE_START_C:
throw FormatException();
}
switch (codeSet) {
case CODE_CODE_A:
if (code < 64) {
result.append(1, (char) (' ' + code));
} else if (code < 96) {
result.append(1, (char) (code - 64));
} else {
// Don't let CODE_STOP, which always appears, affect whether whether we think the
// last code was printable or not.
if (code != CODE_STOP) {
lastCharacterWasPrintable = false;
}
switch (code) {
case CODE_FNC_1:
if (convertFNC1) {
if (result.length() == 0){
// GS1 specification 5.4.3.7. and 5.4.6.4. If the first char after the start code
// is FNC1 then this is GS1-128. We add the symbology identifier.
result.append("]C1");
} else {
// GS1 specification 5.4.7.5. Every subsequent FNC1 is returned as ASCII 29 (GS)
result.append(1, (char) 29);
}
}
break;
case CODE_FNC_2:
case CODE_FNC_3:
case CODE_FNC_4_A:
// do nothing?
break;
case CODE_SHIFT:
isNextShifted = true;
codeSet = CODE_CODE_B;
break;
case CODE_CODE_B:
codeSet = CODE_CODE_B;
break;
case CODE_CODE_C:
codeSet = CODE_CODE_C;
break;
case CODE_STOP:
done = true;
break;
}
}
break;
case CODE_CODE_B:
if (code < 96) {
result.append(1, (char) (' ' + code));
} else {
if (code != CODE_STOP) {
lastCharacterWasPrintable = false;
}
switch (code) {
case CODE_FNC_1:
case CODE_FNC_2:
case CODE_FNC_3:
case CODE_FNC_4_B:
// do nothing?
break;
case CODE_SHIFT:
isNextShifted = true;
codeSet = CODE_CODE_A;
break;
case CODE_CODE_A:
codeSet = CODE_CODE_A;
break;
case CODE_CODE_C:
codeSet = CODE_CODE_C;
break;
case CODE_STOP:
done = true;
break;
}
}
break;
case CODE_CODE_C:
if (code < 100) {
if (code < 10) {
result.append(1, '0');
}
oss.clear();
oss.str("");
oss << code;
result.append(oss.str());
} else {
if (code != CODE_STOP) {
lastCharacterWasPrintable = false;
}
switch (code) {
case CODE_FNC_1:
// do nothing?
break;
case CODE_CODE_A:
codeSet = CODE_CODE_A;
break;
case CODE_CODE_B:
codeSet = CODE_CODE_B;
break;
case CODE_STOP:
done = true;
break;
}
}
break;
}
// Unshift back to another code set if we were shifted
if (unshift) {
codeSet = codeSet == CODE_CODE_A ? CODE_CODE_B : CODE_CODE_A;
}
}
// Check for ample whitespace following pattern, but, to do this we first need to remember that
// we fudged decoding CODE_STOP since it actually has 7 bars, not 6. There is a black bar left
// to read off. Would be slightly better to properly read. Here we just skip it:
nextStart = row->getNextUnset(nextStart);
if (!row->isRange(nextStart,
std::min(row->getSize(), nextStart + (nextStart - lastStart) / 2),
false)) {
throw NotFoundException();
}
// Pull out from sum the value of the penultimate check code
checksumTotal -= multiplier * lastCode;
// lastCode is the checksum then:
if (checksumTotal % 103 != lastCode) {
throw ChecksumException();
}
// Need to pull out the check digits from string
int resultLength = result.length();
if (resultLength == 0) {
// false positive
throw NotFoundException();
}
// Only bother if the result had at least one character, and if the checksum digit happened to
// be a printable character. If it was just interpreted as a control code, nothing to remove.
if (resultLength > 0 && lastCharacterWasPrintable) {
if (codeSet == CODE_CODE_C) {
result.erase(resultLength - 2, resultLength);
} else {
result.erase(resultLength - 1, resultLength);
}
}
float left = (float) (startPatternInfo[1] + startPatternInfo[0]) / 2.0f;
float right = (float) (nextStart + lastStart) / 2.0f;
int rawCodesSize = rawCodes.size();
ArrayRef<char> rawBytes (rawCodesSize);
for (int i = 0; i < rawCodesSize; i++) {
rawBytes[i] = rawCodes[i];
}
ArrayRef< Ref<ResultPoint> > resultPoints(2);
resultPoints[0] =
Ref<OneDResultPoint>(new OneDResultPoint(left, (float) rowNumber));
resultPoints[1] =
Ref<OneDResultPoint>(new OneDResultPoint(right, (float) rowNumber));
return Ref<Result>(new Result(Ref<String>(new String(result)), rawBytes, resultPoints,
BarcodeFormat::CODE_128));
}
