/// <summary>
/// Determine if a character can be represented in a given codeset
/// </summary>
/// <param name="CharAscii">character to check for</param>
/// <param name="currcs">codeset context to test</param>
/// <returns>true if the codeset contains a representation for the ASCII character</returns>
public static bool CharCompatibleWithCodeset(int CharAscii, CodeSet currcs)
{
CodeSetAllowed csa = CodesetAllowedForChar(CharAscii);
return(csa == CodeSetAllowed.CodeAorB ||
(csa == CodeSetAllowed.CodeA && currcs == CodeSet.CodeA) ||
(csa == CodeSetAllowed.CodeB && currcs == CodeSet.CodeB));
}
/// <summary>
/// Determines the best starting code set based on the the first two
/// characters of the string to be encoded
/// </summary>
/// <param name="csa1">First character of input string</param>
/// <param name="csa2">Second character of input string</param>
/// <returns>The codeset determined to be best to start with</returns>
private static CodeSet GetBestStartSet(CodeSetAllowed csa1, CodeSetAllowed csa2)
{
int vote = 0;
vote += (csa1 == CodeSetAllowed.CodeA) ? 1 : 0;
vote += (csa1 == CodeSetAllowed.CodeB) ? -1 : 0;
vote += (csa2 == CodeSetAllowed.CodeA) ? 1 : 0;
vote += (csa2 == CodeSetAllowed.CodeB) ? -1 : 0;
return((vote > 0) ? CodeSet.CodeA : CodeSet.CodeB); // ties go to codeB due to my own prejudices
}
/// <summary>
/// Transform the string into integers representing the Code128 codes
/// necessary to represent it
/// </summary>
/// <param name="AsciiData">String to be encoded</param>
/// <returns>Code128 representation</returns>
private static int[] StringToCode128(string AsciiData)
{
// turn the string into ascii byte data
byte[] asciiBytes = Encoding.ASCII.GetBytes(AsciiData);
// decide which codeset to start with
CodeSetAllowed csa1 = asciiBytes.Length > 0 ? CodesetAllowedForChar(asciiBytes[0]) : CodeSetAllowed.CodeAorB;
CodeSetAllowed csa2 = asciiBytes.Length > 0 ? CodesetAllowedForChar(asciiBytes[1]) : CodeSetAllowed.CodeAorB;
CodeSet currcs = GetBestStartSet(csa1, csa2);
// set up the beginning of the barcode
System.Collections.ArrayList codes = new System.Collections.ArrayList(asciiBytes.Length + 3); // assume no codeset changes, account for start, checksum, and stop
codes.Add(StartCodeForCodeSet(currcs));
// add the codes for each character in the string
for (int i = 0; i < asciiBytes.Length; i++)
{
int thischar = asciiBytes[i];
int nextchar = asciiBytes.Length > (i + 1) ? asciiBytes[i + 1] : -1;
codes.AddRange(CodesForChar(thischar, nextchar, ref currcs));
}
// calculate the check digit
int checksum = (int)(codes[0]);
for (int i = 1; i < codes.Count; i++)
{
checksum += i * (int)(codes[i]);
}
codes.Add(checksum % 103);
codes.Add(StopCode());
int[] result = codes.ToArray(typeof(int)) as int[];
return(result);
}
public static bool CharCompatibleWithCodeset(int CharAscii, CodeSet currcs)
{
CodeSetAllowed allowed = CodesetAllowedForChar(CharAscii);
return(((allowed == CodeSetAllowed.CodeAorB) || ((allowed == CodeSetAllowed.CodeA) && (currcs == CodeSet.CodeA))) || ((allowed == CodeSetAllowed.CodeB) && (currcs == CodeSet.CodeB)));
}
private CodeSet PickStartSet(CodeSetAllowed csa1, CodeSetAllowed csa2)
{
int vote = 0;
vote += (csa1 == CodeSetAllowed.CodeA) ? 1 : 0;
vote += (csa1 == CodeSetAllowed.CodeB) ? -1 : 0;
vote += (csa2 == CodeSetAllowed.CodeA) ? 1 : 0;
vote += (csa2 == CodeSetAllowed.CodeB) ? -1 : 0;
return (vote > 0) ? CodeSet.CodeA : CodeSet.CodeB;
}
