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Auto-Analyze GS1-128 (#238)
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@primo-ppcg
primo-ppcg authored May 20, 2024
1 parent 3482955 commit 6b6272b
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Showing 2 changed files with 90 additions and 10 deletions.
3 changes: 1 addition & 2 deletions src/BinaryKits.Zpl.Viewer/ElementDrawers/Barcode128ElementDrawer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,13 +34,12 @@ public override void Draw(ZplElementBase element, DrawerOptions options)
}
else if (barcode.Mode == "D")
{
codeSet = Code128CodeSet.Code128C;
codeSet = Code128CodeSet.Code128;
gs1 = true;
}
else if (barcode.Mode == "U")
{
codeSet = Code128CodeSet.Code128C;
gs1 = true;
content = content.PadLeft(19, '0').Substring(0, 19);
int checksum = 0;
for (int i = 0; i < 19; i++)
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97 changes: 89 additions & 8 deletions src/BinaryKits.Zpl.Viewer/Symologies/ZplCode128Symbology.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,12 @@ public class ZplCode128Symbology
private static readonly Regex startCRegex = new Regex(@"^\d{4}", RegexOptions.Compiled);
private static readonly Regex digitPairRegex = new Regex(@"^\d\d", RegexOptions.Compiled);

// GS1 specific
private static readonly Regex gs1SwitchCRegex = new Regex(@"^\d\d(?:\d\d|>8)+(?!\d)", RegexOptions.Compiled);
private static readonly Regex gs1StartCRegex = new Regex(@"^(?:\d\d|>8){2}", RegexOptions.Compiled);
private static readonly Regex gs1DigitPairRegex = new Regex(@"^(?:\d\d|>8)", RegexOptions.Compiled);
private static readonly Regex fnc1Regex = new Regex(@"^>8", RegexOptions.Compiled);

private static readonly Regex startCodeRegex = new Regex(@"^(>[9:;])(.+)$", RegexOptions.Compiled);

private static readonly Dictionary<string, int> invocationMap = new Dictionary<string, int>() {
Expand All @@ -44,6 +50,12 @@ public class ZplCode128Symbology
{ ">;", Code128CodeSet.Code128C }
};

private static readonly Dictionary<Code128CodeSet, string> codeSetCodeMap = new Dictionary<Code128CodeSet, string>() {
{ Code128CodeSet.Code128A, CODE_A },
{ Code128CodeSet.Code128B, CODE_B },
{ Code128CodeSet.Code128C, CODE_C }
};

private const string FNC_1 = "FNC_1";
private const string FNC_2 = "FNC_2";
private const string FNC_3 = "FNC_3";
Expand Down Expand Up @@ -208,7 +220,20 @@ static ZplCode128Symbology() {
public static (List<bool>, string) Encode(string content, Code128CodeSet initialCodeSet, bool gs1)
{
List<bool> result = new List<bool>();
var (data, interpretation) = Analyze(content, initialCodeSet);
List<int> data;
string interpretation;
if (gs1)
{
(data, interpretation) = AnalyzeGS1(content);
}
else if (initialCodeSet == Code128CodeSet.Code128)
{
(data, interpretation) = AnalyzeAuto(content);
}
else
{
(data, interpretation) = Analyze(content, initialCodeSet);
}

// TODO: magic constant FNC_1
if (gs1 && data[1] != 102)
Expand Down Expand Up @@ -265,11 +290,6 @@ private static (List<int>, string) Analyze(string content, Code128CodeSet initia
startCodeMatch = startCodeRegex.Match(content);
}

if (codeSet == Code128CodeSet.Code128)
{
return AnalyzeAuto(content);
}

(var codeChars, var codeMap) = codeMaps[codeSet];

data.Add((int)codeSet);
Expand Down Expand Up @@ -303,8 +323,14 @@ private static (List<int>, string) Analyze(string content, Code128CodeSet initia
}
else if (startCodeMap.ContainsKey(symbol))
{
codeSet = startCodeMap[symbol];
(codeChars, codeMap) = codeMaps[codeSet];
Code128CodeSet newCodeSet = startCodeMap[symbol];
if (newCodeSet != codeSet)
{
int value = codeMap[codeSetCodeMap[newCodeSet]];
data.Add(value);
codeSet = newCodeSet;
(codeChars, codeMap) = codeMaps[codeSet];
}
}
else
{
Expand All @@ -322,6 +348,8 @@ private static (List<int>, string) Analyze(string content, Code128CodeSet initia
}
else
{
int value = codeMap[CODE_B];
data.Add(value);
codeSet = Code128CodeSet.Code128B;
(codeChars, codeMap) = codeMaps[codeSet];
}
Expand Down Expand Up @@ -387,5 +415,58 @@ private static (List<int>, string) AnalyzeAuto(string content)
return (data, interpretation);
}

private static (List<int>, string) AnalyzeGS1(string content)
{
List<int> data = new List<int>();
string interpretation = "";
Code128CodeSet codeSet = Code128CodeSet.Code128B;
var codeMap = codeBMap;
if (gs1StartCRegex.IsMatch(content))
{
codeSet = Code128CodeSet.Code128C;
codeMap = codeCMap;
}
data.Add((int)codeSet);

while (content.Length > 0)
{
if (codeSet != Code128CodeSet.Code128C && gs1SwitchCRegex.IsMatch(content))
{
data.Add(codeMap[CODE_C]);
codeSet = Code128CodeSet.Code128C;
codeMap = codeCMap;
}
else if (codeSet == Code128CodeSet.Code128C && !gs1DigitPairRegex.IsMatch(content))
{
data.Add(codeMap[CODE_B]);
codeSet = Code128CodeSet.Code128B;
codeMap = codeBMap;
}
else if (fnc1Regex.IsMatch(content))
{
content = content.Substring(2);
data.Add(codeMap[FNC_1]);
}
else
{
string symbol = content[0].ToString();
if (codeSet == Code128CodeSet.Code128C)
{
symbol += content[1];
content = content.Substring(2);
}
else
{
content = content.Substring(1);
}

data.Add(codeMap[symbol]);
interpretation += symbol;
}
}

return (data, interpretation);
}

}
}

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