int decodeMiddle(BitArray row, int[] startRange, StringBuilder resultString)
{
int[] counters = decodeMiddleCounters;
counters[0] = 0;
counters[1] = 0;
counters[2] = 0;
counters[3] = 0;
int end = row.Size;
int rowOffset = startRange[1];
int lgPatternFound = 0;
for (int x = 0; x < 5 && rowOffset < end; x++)
{
int bestMatch;
if (!UPCEANReader.decodeDigit(row, counters, rowOffset, UPCEANReader.L_AND_G_PATTERNS, out bestMatch))
{
return(-1);
}
resultString.Append((char)('0' + bestMatch % 10));
foreach (int counter in counters)
{
rowOffset += counter;
}
if (bestMatch >= 10)
{
lgPatternFound |= 1 << (4 - x);
}
if (x != 4)
{
// Read off separator if not last
rowOffset = row.getNextSet(rowOffset);
rowOffset = row.getNextUnset(rowOffset);
}
}
if (resultString.Length != 5)
{
return(-1);
}
int checkDigit;
if (!determineCheckDigit(lgPatternFound, out checkDigit))
{
return(-1);
}
if (extensionChecksum(resultString.ToString()) != checkDigit)
{
return(-1);
}
return(rowOffset);
}
int decodeMiddle(BitArray row, int[] startRange, StringBuilder resultString)
{
int[] counters = decodeMiddleCounters;
counters[0] = 0;
counters[1] = 0;
counters[2] = 0;
counters[3] = 0;
int end = row.Size;
int rowOffset = startRange[1];
int checkParity = 0;
for (int x = 0; x < 2 && rowOffset < end; x++)
{
int bestMatch;
if (!UPCEANReader.decodeDigit(row, counters, rowOffset, UPCEANReader.L_AND_G_PATTERNS, out bestMatch))
{
return(-1);
}
resultString.Append((char)('0' + bestMatch % 10));
foreach (int counter in counters)
{
rowOffset += counter;
}
if (bestMatch >= 10)
{
checkParity |= 1 << (1 - x);
}
if (x != 1)
{
// Read off separator if not last
rowOffset = row.getNextSet(rowOffset);
rowOffset = row.getNextUnset(rowOffset);
}
}
if (resultString.Length != 2)
{
return(-1);
}
if (int.Parse(resultString.ToString()) % 4 != checkParity)
{
return(-1);
}
return(rowOffset);
}
