//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: public com.google.zxing.Result decodeRow(int rowNumber, com.google.zxing.common.BitArray row, java.util.Map<com.google.zxing.DecodeHintType,?> hints) throws com.google.zxing.NotFoundException, com.google.zxing.ChecksumException, com.google.zxing.FormatException
public override Result decodeRow(int rowNumber, BitArray row, IDictionary<DecodeHintType, object> hints)
{
int[] theCounters = counters;
theCounters.Fill(0);
StringBuilder result = decodeRowResult;
result.Length = 0;
int[] start = findAsteriskPattern(row, theCounters);
// Read off white space
int nextStart = row.getNextSet(start[1]);
int end = row.Size;
char decodedChar;
int lastStart;
do
{
recordPattern(row, nextStart, theCounters);
int pattern = toNarrowWidePattern(theCounters);
if (pattern < 0)
{
throw NotFoundException.NotFoundInstance;
}
decodedChar = patternToChar(pattern);
result.Append(decodedChar);
lastStart = nextStart;
foreach (int counter in theCounters)
{
nextStart += counter;
}
// Read off white space
nextStart = row.getNextSet(nextStart);
} while (decodedChar != '*');
result.Length = result.Length - 1; // remove asterisk
// Look for whitespace after pattern:
int lastPatternSize = 0;
foreach (int counter in theCounters)
{
lastPatternSize += counter;
}
int whiteSpaceAfterEnd = nextStart - lastStart - lastPatternSize;
// If 50% of last pattern size, following last pattern, is not whitespace, fail
// (but if it's whitespace to the very end of the image, that's OK)
if (nextStart != end && (whiteSpaceAfterEnd >> 1) < lastPatternSize)
{
throw NotFoundException.NotFoundInstance;
}
if (usingCheckDigit)
{
int max = result.Length - 1;
int total = 0;
for (int i = 0; i < max; i++)
{
total += ALPHABET_STRING.IndexOf(decodeRowResult[i]);
}
if (result[max] != ALPHABET[total % 43])
{
throw ChecksumException.ChecksumInstance;
}
result.Length = max;
}
if (result.Length == 0)
{
// false positive
throw NotFoundException.NotFoundInstance;
}
string resultString;
if (extendedMode)
{
resultString = decodeExtended(result.ToString());
}
else
{
resultString = result.ToString();
}
float left = (float)(start[1] + start[0]) / 2.0f;
float right = (float)(nextStart + lastStart) / 2.0f;
return new Result(resultString, null, new ResultPoint[]{new ResultPoint(left, (float) rowNumber), new ResultPoint(right, (float) rowNumber)}, BarcodeFormat.CODE_39);
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private static int[] findAsteriskPattern(com.google.zxing.common.BitArray row, int[] counters) throws com.google.zxing.NotFoundException
private static int[] findAsteriskPattern(BitArray row, int[] counters)
{
int width = row.Size;
int rowOffset = row.getNextSet(0);
int counterPosition = 0;
int patternStart = rowOffset;
bool isWhite = false;
int patternLength = counters.Length;
for (int i = rowOffset; i < width; i++)
{
if (row.get(i) ^ isWhite)
{
counters[counterPosition]++;
}
else
{
if (counterPosition == patternLength - 1)
{
// Look for whitespace before start pattern, >= 50% of width of start pattern
if (toNarrowWidePattern(counters) == ASTERISK_ENCODING && row.isRange(Math.Max(0, patternStart - ((i - patternStart) >> 1)), patternStart, false))
{
return new int[]{patternStart, i};
}
patternStart += counters[0] + counters[1];
Array.Copy(counters, 2, counters, 0, patternLength - 2);
counters[patternLength - 2] = 0;
counters[patternLength - 1] = 0;
counterPosition--;
}
else
{
counterPosition++;
}
counters[counterPosition] = 1;
isWhite = !isWhite;
}
}
throw NotFoundException.NotFoundInstance;
}
/// <param name="row"> row of black/white values to search </param>
/// <param name="rowOffset"> position to start search </param>
/// <param name="whiteFirst"> if true, indicates that the pattern specifies white/black/white/...
/// pixel counts, otherwise, it is interpreted as black/white/black/... </param>
/// <param name="pattern"> pattern of counts of number of black and white pixels that are being
/// searched for as a pattern </param>
/// <param name="counters"> array of counters, as long as pattern, to re-use </param>
/// <returns> start/end horizontal offset of guard pattern, as an array of two ints </returns>
/// <exception cref="NotFoundException"> if pattern is not found </exception>
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private static int[] findGuardPattern(com.google.zxing.common.BitArray row, int rowOffset, boolean whiteFirst, int[] pattern, int[] counters) throws com.google.zxing.NotFoundException
private static int[] findGuardPattern(BitArray row, int rowOffset, bool whiteFirst, int[] pattern, int[] counters)
{
int patternLength = pattern.Length;
int width = row.Size;
bool isWhite = whiteFirst;
rowOffset = whiteFirst ? row.getNextUnset(rowOffset) : row.getNextSet(rowOffset);
int counterPosition = 0;
int patternStart = rowOffset;
for (int x = rowOffset; x < width; x++)
{
if (row.get(x) ^ isWhite)
{
counters[counterPosition]++;
}
else
{
if (counterPosition == patternLength - 1)
{
if (patternMatchVariance(counters, pattern, MAX_INDIVIDUAL_VARIANCE) < MAX_AVG_VARIANCE)
{
return new int[]{patternStart, x};
}
patternStart += counters[0] + counters[1];
Array.Copy(counters, 2, counters, 0, patternLength - 2);
counters[patternLength - 2] = 0;
counters[patternLength - 1] = 0;
counterPosition--;
}
else
{
counterPosition++;
}
counters[counterPosition] = 1;
isWhite = !isWhite;
}
}
throw NotFoundException.NotFoundInstance;
}
