invoiceEncode function

String invoiceEncode(InvoiceDataModel model, [ InvoiceEncodeOptions options = const InvoiceEncodeOptions() ])

Encodes an InvoiceDataModel into a Base32Hex QR string.

Uses bysquareType=1; the InvoiceDataModel.documentType nibble selects the specific sub-type (Invoice, ProformaInvoice, CreditNote, etc.).

Implementation

String invoiceEncode(
  InvoiceDataModel model, [
  InvoiceEncodeOptions options = const InvoiceEncodeOptions(),
]) {
  if (options.validate) {
    validateInvoiceDataModel(model);
  }

  final tabbed    = invoiceSerialize(model);
  final checked   = addChecksum(tabbed);
  final compressed = lzmaCompress(checked);

  // Strip the 13-byte LZMA header - bysquare stores only the body
  final lzmaBody = compressed.sublist(13);

  final output = Uint8List.fromList([
    ...buildBysquareHeader(
      bySquareType: 0x01, // TYPE_INVOICE
      version: options.version,
      documentType: model.documentType,
    ),
    ...buildPayloadLength(checked.length),
    ...lzmaBody,
  ]);

  return base32hexEncode(output, addPadding: false);
}