public string Calculate(string data)
{
char currCode = Code128Encoder.ResolveStartCode(data[0]);
// start character
int sum = Code128Encoder.SymbolValue(data[0].ToString(), currCode);
for (int i = 1, pos = 1; i < data.Length; ++i, ++pos)
{
string curr = data[i].ToString();
int value = 0;
if (currCode == Code128Encoder.CodeC && char.IsNumber(data[i]))
{
value = Code128Encoder.SymbolValue(curr + data[++i].ToString(), currCode);
}
else
{
value = Code128Encoder.SymbolValue(curr, currCode);
}
sum += pos * value;
// detect change in current code
switch (data[i])
{
case Code128Encoder.CodeA:
case Code128Encoder.CodeB:
case Code128Encoder.CodeC:
currCode = data[i];
break;
}
}
return(Code128Encoder.SymbolString(sum % 103, currCode));
}
// code the 128 barcode data to use as little space as possible
public string Code(string data)
{
if (data.Length == 0)
{
return("");
}
// first determine what codes can be used to code every character
_allCodes = new int[data.Length];
for (int i = 0; i < data.Length; ++i)
{
string curr = data[i].ToString();
if (Code128Encoder.CanCode(curr, Code128Encoder.CodeA))
{
_allCodes[i] |= codeA;
}
if (Code128Encoder.CanCode(curr, Code128Encoder.CodeB))
{
_allCodes[i] |= codeB;
}
// code C will code more than one character (FNC1??)
//if (Code128Encoder.CanCode(curr, Code128Encoder.CodeC)) _allCodes[i] |= codeC; //FNC1??
if (i < data.Length - 1 &&
Code128Encoder.CanCode(curr + data[i + 1].ToString(), Code128Encoder.CodeC))
{
_allCodes[i] |= codeCFirst;
_allCodes[i + 1] |= codeCSecond;
}
}
// backtrack to find the best configuration
_bestCodeValue = int.MaxValue;
_bestCode = new int[_allCodes.Length];
_currCode = new int[_allCodes.Length];
SolveCode(0);
for (int i = 0; i < _bestCode.Length; ++i)
{
if (_bestCode[i] > codeC)
{
_bestCode[i] = codeC; // change codeCFirst and codeCSecond to codeC
}
}
DebugCode(data);
// put code start and code changes in result string
StringBuilder sb = new StringBuilder();
int code = _bestCode[0];
switch (code)
{
case codeA: sb.Append(Code128Encoder.StartA); break;
case codeB: sb.Append(Code128Encoder.StartB); break;
case codeC: sb.Append(Code128Encoder.StartC); break;
}
for (int i = 0; i < _bestCode.Length; ++i)
{
if (_bestCode[i] != code)
{
code = _bestCode[i];
switch (code)
{
case codeA: sb.Append(Code128Encoder.CodeA); break;
case codeB: sb.Append(Code128Encoder.CodeB); break;
case codeC: sb.Append(Code128Encoder.CodeC); break;
}
}
sb.Append(data[i]);
}
return(sb.ToString());
}
