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nicer way of parsing barcode 'fragments', bar to decimal table support

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This commit is contained in:
Lynne Megido 2020-10-14 02:51:53 +10:00
parent 71590dc93d
commit d290dbadad
Signed by: lynnesbian
GPG key ID: F0A184B5213D9F90
4 changed files with 139 additions and 70 deletions
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88
.idea/.idea.auspostcode.dir/.idea/workspace.xml
View file

@ -20,12 +20,9 @@
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<change beforePath="$PROJECT_DIR$/Barcode.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Barcode.cs" afterDir="false" /> <change beforePath="$PROJECT_DIR$/Barcode.cs" beforeDir="false" afterPath="$PROJECT_DIR$/Barcode.cs" afterDir="false" />
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@ -40,6 +37,7 @@
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@ -98,7 +96,7 @@
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<created>1602597326777</created> <created>1602597326777</created>
@ -150,86 +148,86 @@
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110
Barcode.cs
View file

@ -5,14 +5,27 @@ using System.Text.RegularExpressions;
namespace AusPostCode { namespace AusPostCode {
public class Barcode { public class Barcode {
public enum BarcodeFragment { private readonly struct BarcodeFragment {
FormatControlCode, public EncodingFormat TypicalFormat { get; }
SortingCode, public int Length { get;}
CustomerInformation, public int Offset { get; }
ErrorCorrection,
public BarcodeFragment(EncodingFormat typicalFormat, int length, int offset) {
TypicalFormat = typicalFormat;
Length = length;
Offset = offset;
}
} }
public enum EncodingFormat { private readonly Dictionary<string, BarcodeFragment> _fragments = new Dictionary<string, BarcodeFragment> {
["FormatControlCode"] = new BarcodeFragment(EncodingFormat.N, 4, 2),
["SortingCode"] = new BarcodeFragment(EncodingFormat.N, 16, 6),
["CustomerInformation2"] = new BarcodeFragment(EncodingFormat.C, 16, 22),
["CustomerInformation3"] = new BarcodeFragment(EncodingFormat.C, 31, 22),
["ErrorCorrection"] = new BarcodeFragment(EncodingFormat.BarToDecimal, 12, - 16),
};
private enum EncodingFormat {
N, N,
C, C,
BarToDecimal, BarToDecimal,
@ -20,7 +33,7 @@ namespace AusPostCode {
private int _formatCode; private int _formatCode;
public Dictionary<int, string> FormatTable = new Dictionary<int, string> { private readonly Dictionary<int, string> _formatTable = new Dictionary<int, string> {
[0] = "Null Customer Barcode", [0] = "Null Customer Barcode",
[11] = "Standard Customer Barcode", [11] = "Standard Customer Barcode",
[52] = "Customer Business Reply Paid", [52] = "Customer Business Reply Paid",
@ -45,31 +58,82 @@ namespace AusPostCode {
} }
// process Format Control Code // process Format Control Code
_formatCode = int.Parse(Decode(GetFragment(BarcodeFragment.FormatControlCode), EncodingFormat.N)); _formatCode = int.Parse(GetFragment(_fragments["FormatControlCode"]));
Console.WriteLine(Format); Console.WriteLine(Format);
// process Sorting Code Field // process Sorting Code Field
SortingCode = int.Parse(Decode(GetFragment(BarcodeFragment.SortingCode), EncodingFormat.N)); SortingCode = int.Parse(GetFragment(_fragments["SortingCode"]));
Console.WriteLine($"Sorting code: {SortingCode}"); Console.WriteLine($"Sorting code: {SortingCode}");
// process Customer Information, if necessary
// TODO: actually do this, and get a code to test it on. also, ensure that customer codes are the right length
if (_formatCode == 59) {
Console.WriteLine("This code has a Customer Information field, but I don't know how to process that yet 0uo");
} else if (_formatCode == 62) {
Console.WriteLine("This code has a Customer Information field, but I don't know how to process that yet 0uo");
}
// process Reed-Solomon Error Correction Bars
// TODO: actually validate the barcode
Console.WriteLine(BaseConversion.FromBase(GetFragment(_fragments["ErrorCorrection"]), 64));
} }
public int SortingCode { get; set; } public int SortingCode { get; set; }
public int CustomerInformation { get; set; } public int CustomerInformation { get; set; }
public string Format => FormatTable.ContainsKey(_formatCode) ? FormatTable[_formatCode] : $"Unknown ({_formatCode})"; public string Format => _formatTable.ContainsKey(_formatCode) ? _formatTable[_formatCode] : $"Unknown ({_formatCode})";
private List<string> Warnings { get; set; } = new List<string>(); private List<string> Warnings { get; } = new List<string>();
private string Code { get; set; } private string Code { get; }
private string GetFragment(BarcodeFragment barcodeFragment) { private string GetFragment(BarcodeFragment fragment, bool decode = true) {
return barcodeFragment switch { var data = Code.Substring(fragment.Offset < 0 ? Code.Length + fragment.Offset : fragment.Offset, fragment.Length);
BarcodeFragment.FormatControlCode => Code.Substring(2, 4),
BarcodeFragment.SortingCode => Code.Substring(6, 16), if (!decode) {
BarcodeFragment.CustomerInformation when _formatCode == 59 => Code.Substring(22, 16), return data;
BarcodeFragment.CustomerInformation when _formatCode == 62 => Code.Substring(22, 31), }
BarcodeFragment.CustomerInformation => null, // format doesn't support the customer information field
BarcodeFragment.ErrorCorrection => Code.Substring(Code.Length - 15, // bool badData;
12), // the error correction bars are always immediately before the stop bars var chunkLength = fragment.TypicalFormat == EncodingFormat.N ? 2 : 3;
_ => throw new ArgumentOutOfRangeException(nameof(barcodeFragment), barcodeFragment, null), var rx = new Regex("^[0123]+$");
}; var sb = new StringBuilder();
if (!rx.IsMatch(data)) {
throw new ArgumentException("Input length must be a quaternary number.", nameof(data));
}
for (var i = 0; i < data.Length; i += chunkLength) {
var chunk = data.Substring(i, chunkLength);
switch (fragment.TypicalFormat) {
case EncodingFormat.N:
// format N supports the digits 0 through 9, and nothing else.
// digits 0 through 8 are stored as their ternary representations, while 9 is stored as "30".
if (chunk == "30") {
sb.Append(9);
}
else if (chunk.Contains("3")) {
// not a ternary number
throw new ArgumentException($"{chunk} is not a valid identifier for format {data.ToString()}.");
}
else {
sb.Append(BaseConversion.FromBase(chunk, 3));
}
break;
case EncodingFormat.C:
break;
case EncodingFormat.BarToDecimal:
var digitInt = BaseConversion.FromBase(chunk, 4);
sb.Insert(0, BaseConversion.ToBase(digitInt, 64));
break;
default:
throw new ArgumentOutOfRangeException(nameof(fragment.TypicalFormat), fragment.TypicalFormat, null);
}
}
return sb.ToString();
} }
private static string Decode(string input, EncodingFormat format) { private static string Decode(string input, EncodingFormat format) {

2
BaseConversion.cs
View file

@ -6,7 +6,7 @@ namespace AusPostCode {
public static class BaseConversion { public static class BaseConversion {
// honestly surprised c# doesn't do this out of the box // honestly surprised c# doesn't do this out of the box
private static readonly char[] Characters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray(); private static readonly char[] Characters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-=".ToCharArray();
// thanks to https://stackoverflow.com/a/35004409 // thanks to https://stackoverflow.com/a/35004409
private static readonly Dictionary<char, int> CharacterIndices = private static readonly Dictionary<char, int> CharacterIndices =

9
Program.cs
View file

@ -22,8 +22,15 @@ using CommandLine;
namespace AusPostCode { namespace AusPostCode {
internal class Program { internal class Program {
private static void Main(string[] args) { private static void Main(string[] args) {
Console.WriteLine("Hello World!"); // test code consisting of the following:
// - start bars
// - fcc of 0101 == 11 == standard customer barcode
// - sorting code of 2112011202120020 == 75152506
// - a filler bar of 3
// - a reed-solomon code of 001101103221 == 10826817
// - end bars
const string testCode = "1301012112011202120020300110110322113"; const string testCode = "1301012112011202120020300110110322113";
var barcode = new Barcode(testCode); var barcode = new Barcode(testCode);
} }