private void encodeLowLevel(String fullCodewords,
int c,
int r,
int errorCorrectionLevel,
BarcodeMatrix logic)
{
int idx = 0;
for (int y = 0; y < r; y++)
{
int cluster = y % 3;
logic.startRow();
encodeChar(START_PATTERN, 17, logic.getCurrentRow());
int left;
int right;
if (cluster == 0)
{
left = (30 * (y / 3)) + ((r - 1) / 3);
right = (30 * (y / 3)) + (c - 1);
}
else if (cluster == 1)
{
left = (30 * (y / 3)) + (errorCorrectionLevel * 3) + ((r - 1) % 3);
right = (30 * (y / 3)) + ((r - 1) / 3);
}
else
{
left = (30 * (y / 3)) + (c - 1);
right = (30 * (y / 3)) + (errorCorrectionLevel * 3) + ((r - 1) % 3);
}
int pattern = CODEWORD_TABLE[cluster][left];
encodeChar(pattern, 17, logic.getCurrentRow());
for (int x = 0; x < c; x++)
{
pattern = CODEWORD_TABLE[cluster][fullCodewords[idx]];
encodeChar(pattern, 17, logic.getCurrentRow());
idx++;
}
if (compact)
{
encodeChar(STOP_PATTERN, 1, logic.getCurrentRow()); // encodes stop line for compact pdf417
}
else
{
pattern = CODEWORD_TABLE[cluster][right];
encodeChar(pattern, 17, logic.getCurrentRow());
encodeChar(STOP_PATTERN, 18, logic.getCurrentRow());
}
}
}
/// <summary>
/// Generates the barcode logic.
/// </summary>
/// <param name="msg">the message to encode</param>
/// <param name="errorCorrectionLevel">PDF417 error correction level to use</param>
internal void generateBarcodeLogic(String msg, int errorCorrectionLevel)
{
//1. step: High-level encoding
int errorCorrectionCodeWords = PDF417ErrorCorrection.getErrorCorrectionCodewordCount(errorCorrectionLevel);
String highLevel = PDF417HighLevelEncoder.encodeHighLevel(msg, compaction, encoding, disableEci);
int sourceCodeWords = highLevel.Length;
int[] dimension = determineDimensions(sourceCodeWords, errorCorrectionCodeWords);
int cols = dimension[0];
int rows = dimension[1];
int pad = getNumberOfPadCodewords(sourceCodeWords, errorCorrectionCodeWords, cols, rows);
//2. step: construct data codewords
if (sourceCodeWords + errorCorrectionCodeWords + 1 > 929)
{
// +1 for symbol length CW
throw new WriterException(
"Encoded message contains to many code words, message to big (" + msg.Length + " bytes)");
}
int n = sourceCodeWords + pad + 1;
StringBuilder sb = new StringBuilder(n);
sb.Append((char)n);
sb.Append(highLevel);
for (int i = 0; i < pad; i++)
{
sb.Append((char)900); //PAD characters
}
String dataCodewords = sb.ToString();
//3. step: Error correction
String ec = PDF417ErrorCorrection.generateErrorCorrection(dataCodewords, errorCorrectionLevel);
String fullCodewords = dataCodewords + ec;
//4. step: low-level encoding
barcodeMatrix = new BarcodeMatrix(rows, cols);
encodeLowLevel(fullCodewords, cols, rows, errorCorrectionLevel, barcodeMatrix);
}
