private static int[] EncodeData(int[] dataWords, int columns, byte securityLevel)
{
int dataCount = dataWords.Length;
int ecCount = ErrorCorrection.GetErrorCorrectionWordCount(securityLevel);
int[] padWords = GetPadding(dataCount, ecCount, columns);
dataWords = dataWords.Concat(padWords).ToArray();
int length = dataWords.Length + 1;
dataWords = new[] { length }.Concat(dataWords).ToArray();
int[] ecWords = ErrorCorrection.Compute(securityLevel, dataWords);
return(dataWords.Concat(ecWords).ToArray());
}
// Encodes the given data as PDF417 barcode.
// securityLevel should be between 0 and 8. The higher the number, the more
// additional error-correction codes are added.
public static IBarcode Encode(string data, byte securityLevel)
{
if (securityLevel >= 9)
{
throw new ArgumentOutOfRangeException($"Invalid security level {securityLevel}");
}
int[] dataWords = HighLevelEncoding.Encode(data);
(int columns, int rows) = Dimensions.CalculateDimensions(dataWords.Length, ErrorCorrection.GetErrorCorrectionWordCount(securityLevel));
if (columns < Dimensions.MinimumNumberOfColumns || columns > Dimensions.MaximumNumberOfColumns ||
rows < Dimensions.MinimumNumberOfRows || rows > Dimensions.MaximumNumberOfRows)
{
throw new InvalidOperationException($"Unable to fit data in barcode");
}
int[] codeWords = EncodeData(dataWords, columns, securityLevel);
var grid = new List <int[]>();
for (int i = 0; i < codeWords.Length; i += columns)
{
int length = Math.Min(i + columns, codeWords.Length) - i;
var row = new int[length];
Array.Copy(codeWords, i, row, 0, length);
grid.Add(row);
}
var codes = new List <int[]>();
for (int rowNum = 0; rowNum < grid.Count; rowNum++)
{
int[] row = grid[rowNum];
int table = rowNum % 3;
var rowCodes = new List <int>(columns + 4);
rowCodes.Add(CodeWord.StartWord);
rowCodes.Add(CodeWord.Get(table, GetLeftCodeWord(rowNum, rows, columns, securityLevel)));
foreach (var word in row)
{
rowCodes.Add(CodeWord.Get(table, word));
}
rowCodes.Add(CodeWord.Get(table, GetRightCodeWord(rowNum, rows, columns, securityLevel)));
rowCodes.Add(CodeWord.StopWord);
codes.Add(rowCodes.ToArray());
}
return(new Pdf417Code(data, RenderBarcode(codes), (columns + 4) * 17 + 1));
}
