Toolkit.UI.Controls.Avalonia
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TheXamlGuy
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using System;
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using System.Collections.Generic;
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namespace Gma.QrCodeNet.Encoding.DataEncodation;
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public sealed class ECISet
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{
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/// <summary>
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/// ISO/IEC 18004:2006 Chapter 6.4.2 Mode indicator = 0111 Page 23
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/// </summary>
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private const int ECIMode = 7;
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private const int ECIIndicatorNumBits = 4;
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private Dictionary<string, int>? _nameToValue;
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private Dictionary<int, string>? _valueToName;
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/// <summary>
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/// Initialize ECI Set.
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/// </summary>
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/// <param name="option">AppendOption is enum under ECISet
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/// Use NameToValue during Encode. ValueToName during Decode</param>
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internal ECISet(AppendOption option)
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{
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Initialize(option);
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}
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public enum AppendOption
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{
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NameToValue,
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ValueToName,
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Both
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}
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/// <summary>
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/// Length indicator for number of ECI codewords
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/// </summary>
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/// <remarks>ISO/IEC 18004:2006 Chapter 6.4.2 Page 24.
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/// 1 codeword length = 0. Any additional codeword add 1 to front. Eg: 3 = 110</remarks>
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/// <description>Bits required for each one is:
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/// one = 1, two = 2, three = 3</description>
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private enum ECICodewordsLength
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{
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One = 0,
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Two = 2,
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Three = 6
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}
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/// <remarks>ISO/IEC 18004:2006E ECI Designator Page 24</remarks>
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/// <param name="eCIValue">Range: 0 ~ 999999</param>
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/// <returns>Number of Codewords(Byte) for ECI Assignment Value</returns>
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private static int NumOfCodewords(int eCIValue)
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{
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if (eCIValue is >= 0 and <= 127)
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{
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return 1;
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}
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else if (eCIValue is > 127 and <= 16383)
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{
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return 2;
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}
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else if (eCIValue is > 16383 and <= 999999)
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{
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return 3;
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}
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else
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{
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throw new ArgumentOutOfRangeException($"{nameof(eCIValue)} should be in range: 0 to 999999.");
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}
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}
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/// <remarks>ISO/IEC 18004:2006E ECI Designator Page 24</remarks>
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/// <param name="eCIValue">Range: 0 ~ 999999</param>
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/// <returns>Number of bits for ECI Assignment Value</returns>
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private static int NumOfAssignmentBits(int eCIValue) => NumOfCodewords(eCIValue) * 8;
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private void AppendECI(string name, int value, AppendOption option)
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{
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switch (option)
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{
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case AppendOption.NameToValue:
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_nameToValue?.Add(name, value);
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break;
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case AppendOption.ValueToName:
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_valueToName?.Add(value, name);
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break;
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case AppendOption.Both:
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_nameToValue?.Add(name, value);
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_valueToName?.Add(value, name);
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break;
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default:
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throw new InvalidOperationException($"There is no such {nameof(AppendOption)}.");
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}
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}
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private void Initialize(AppendOption option)
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{
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switch (option)
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{
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case AppendOption.NameToValue:
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_nameToValue = new Dictionary<string, int>();
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break;
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case AppendOption.ValueToName:
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_valueToName = new Dictionary<int, string>();
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break;
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case AppendOption.Both:
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_nameToValue = new Dictionary<string, int>();
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_valueToName = new Dictionary<int, string>();
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break;
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default:
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throw new InvalidOperationException($"There is no such {nameof(AppendOption)}.");
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}
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// ECI table. Source 01 URL: http://strokescribe.com/en/ECI.html
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// ECI table. Source 02 URL: http://lab.must.or.kr/Extended-Channel-Interpretations-ECI-Encoding.ashx
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// ToDo. Fill up remaining missing table.
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AppendECI("iso-8859-1", 1, option);
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AppendECI("IBM437", 2, option);
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// AppendECI("iso-8859-1", 3, option); //ECI value 1 is default encoding.
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AppendECI("iso-8859-2", 4, option);
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AppendECI("iso-8859-3", 5, option);
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AppendECI("iso-8859-4", 6, option);
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AppendECI("iso-8859-5", 7, option);
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AppendECI("iso-8859-6", 8, option);
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AppendECI("iso-8859-7", 9, option);
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AppendECI("iso-8859-8", 10, option);
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AppendECI("iso-8859-9", 11, option);
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AppendECI("windows-874", 13, option);
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AppendECI("iso-8859-13", 15, option);
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AppendECI("iso-8859-15", 17, option);
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AppendECI("shift_jis", 20, option);
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AppendECI("utf-8", 26, option);
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}
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/// <remarks>ISO/IEC 18004:2006E ECI Designator Page 24</remarks>
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/// <param name="eCIValue">Range: 0 ~ 999999</param>
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/// <returns>Number of bits for ECI Header</returns>
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internal static int NumOfECIHeaderBits(int eCIValue) => NumOfAssignmentBits(eCIValue) + 4;
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internal int GetECIValueByName(string encodingName)
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{
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if (_nameToValue is null)
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{
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Initialize(AppendOption.NameToValue);
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}
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if (_nameToValue!.TryGetValue(encodingName, out int eCIValue))
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{
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return eCIValue;
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}
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else
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{
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throw new ArgumentOutOfRangeException($"ECI does not contain encoding: {encodingName}.");
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}
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}
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internal string GetECINameByValue(int eCIValue)
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{
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if (_valueToName is null)
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{
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Initialize(AppendOption.ValueToName);
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}
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if (_valueToName!.TryGetValue(eCIValue, out var eCIName))
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{
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return eCIName;
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}
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else
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{
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throw new ArgumentOutOfRangeException($"ECI does not contain value: {eCIValue}.");
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}
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}
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/// <returns>ECI table in Dictionary collection</returns>
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public Dictionary<string, int>? GetECITable()
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{
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if (_nameToValue is null)
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{
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Initialize(AppendOption.NameToValue);
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}
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return _nameToValue;
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}
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public bool ContainsECIName(string encodingName)
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{
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if (_nameToValue is null)
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{
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Initialize(AppendOption.NameToValue);
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}
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return _nameToValue!.ContainsKey(encodingName);
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}
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public bool ContainsECIValue(int eciValue)
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{
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if (_valueToName is null)
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{
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Initialize(AppendOption.ValueToName);
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}
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return _valueToName!.ContainsKey(eciValue);
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}
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/// <remarks>ISO/IEC 18004:2006 Chapter 6.4.2 Page 24.</remarks>
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internal BitList GetECIHeader(string encodingName)
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{
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int eciValue = GetECIValueByName(encodingName);
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BitList dataBits = new()
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{
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{ ECIMode, ECIIndicatorNumBits }
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};
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int eciAssignmentByte = NumOfCodewords(eciValue);
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// Number of bits = Num codewords indicator + codeword value = Number of codewords * 8
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// Chapter 6.4.2.1 ECI Designator ISOIEC 18004:2006 Page 24
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int eciAssignmentBits;
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switch (eciAssignmentByte)
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{
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case 1:
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// Indicator = 0. Page 24. Chapter 6.4.2.1
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dataBits.Add((int)ECICodewordsLength.One, 1);
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eciAssignmentBits = (eciAssignmentByte * 8) - 1;
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break;
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case 2:
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// Indicator = 10. Page 24. Chapter 6.4.2.1
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dataBits.Add((int)ECICodewordsLength.Two, 2);
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eciAssignmentBits = (eciAssignmentByte * 8) - 2;
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break;
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case 3:
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// Indicator = 110. Page 24. Chapter 6.4.2.1
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dataBits.Add((int)ECICodewordsLength.Three, 3);
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eciAssignmentBits = (eciAssignmentByte * 8) - 3;
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break;
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default:
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throw new InvalidOperationException("Assignment Codewords should be either 1, 2 or 3.");
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}
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dataBits.Add(eciValue, eciAssignmentBits);
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return dataBits;
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}
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}
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