2020-10-13 16:03:20 +00:00
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using System;
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2020-10-13 13:55:26 +00:00
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using System.Collections.Generic;
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2020-10-13 16:03:20 +00:00
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using System.Text;
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using System.Text.RegularExpressions;
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2020-10-13 13:55:26 +00:00
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namespace AusPostCode {
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public class Barcode {
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2020-10-13 16:03:20 +00:00
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public enum BarcodeFragment {
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FormatControlCode,
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SortingCode,
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CustomerInformation,
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ErrorCorrection,
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}
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public enum EncodingFormat {
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N,
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C,
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BarToDecimal,
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}
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private int _formatCode;
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public Dictionary<int, string> FormatTable = new Dictionary<int, string> {
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2020-10-13 13:55:26 +00:00
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[0] = "Null Customer Barcode",
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[11] = "Standard Customer Barcode",
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[52] = "Customer Business Reply Paid",
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[59] = "Customer Barcode 2",
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[62] = "Customer Barcode 3",
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[67] = "Customer Business Reply Paid",
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[72] = "International Business Reply Paid",
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2020-10-13 16:03:20 +00:00
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[77] = "International Business Reply Paid",
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2020-10-13 13:55:26 +00:00
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};
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public Barcode(string code) {
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Code = code;
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2020-10-13 16:03:20 +00:00
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// - check for start and end bars
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if (Code.Substring(0, 2) != "13") {
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Warnings.Add("Couldn't find Start Bars");
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Code = $"13{Code}";
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}
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if (Code.Substring(Code.Length - 3, 2) != "13") {
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Warnings.Add("Couldn't find End Bars");
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Code = $"{Code}13";
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}
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// process Format Control Code
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_formatCode = int.Parse(Decode(GetFragment(BarcodeFragment.FormatControlCode), EncodingFormat.N));
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Console.WriteLine(Format);
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// process Sorting Code Field
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SortingCode = int.Parse(Decode(GetFragment(BarcodeFragment.SortingCode), EncodingFormat.N));
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Console.WriteLine($"Sorting code: {SortingCode}");
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}
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public int SortingCode { get; set; }
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public int CustomerInformation { get; set; }
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public string Format => FormatTable.ContainsKey(_formatCode) ? FormatTable[_formatCode] : $"Unknown ({_formatCode})";
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private List<string> Warnings { get; set; } = new List<string>();
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private string Code { get; set; }
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private string GetFragment(BarcodeFragment barcodeFragment) {
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return barcodeFragment switch {
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BarcodeFragment.FormatControlCode => Code.Substring(2, 4),
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BarcodeFragment.SortingCode => Code.Substring(6, 16),
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BarcodeFragment.CustomerInformation when _formatCode == 59 => Code.Substring(22, 16),
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BarcodeFragment.CustomerInformation when _formatCode == 62 => Code.Substring(22, 31),
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BarcodeFragment.CustomerInformation => null, // format doesn't support the customer information field
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BarcodeFragment.ErrorCorrection => Code.Substring(Code.Length - 15,
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12), // the error correction bars are always immediately before the stop bars
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_ => throw new ArgumentOutOfRangeException(nameof(barcodeFragment), barcodeFragment, null),
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};
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}
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private static string Decode(string input, EncodingFormat format) {
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// bool badData;
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var chunkLength = format == EncodingFormat.N ? 2 : 3;
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if (input.Length % 2 != 0) {
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throw new ArgumentException($"Input length must be a multiple of {chunkLength}.", nameof(input));
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}
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var rx = new Regex("^[0123]+$");
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if (!rx.IsMatch(input)) {
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throw new ArgumentException("Input length must be a quaternary number.", nameof(input));
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}
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var sb = new StringBuilder();
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for (var i = 0; i < input.Length; i += chunkLength) {
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var chunk = input.Substring(i, chunkLength);
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switch (format) {
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case EncodingFormat.N:
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// format N supports the digits 0 through 9, and nothing else.
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// digits 0 through 8 are stored as their ternary representations, while 9 is stored as "30".
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if (chunk == "30") {
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sb.Append(9);
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}
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else if (chunk.Contains("3")) {
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// not a ternary number
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throw new ArgumentException($"{chunk} is not a valid identifier for format {format.ToString()}.");
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}
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else {
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sb.Append(BaseConversion.FromBase(chunk, 3));
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}
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break;
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case EncodingFormat.C:
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break;
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case EncodingFormat.BarToDecimal:
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break;
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default:
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throw new ArgumentOutOfRangeException(nameof(format), format, null);
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}
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}
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return sb.ToString();
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2020-10-13 13:55:26 +00:00
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}
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}
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}
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