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50 lines
1.4 KiB
C#
50 lines
1.4 KiB
C#
using System;
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namespace BrotliLib.Numbers{
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/// <summary>
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/// Defines properties of a symbol alphabet.
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/// </summary>
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public readonly struct AlphabetSize{
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/// <summary>
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/// Returns the minimum amount of bits required to represent every symbol in the alphabet.
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/// </summary>
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public int BitsPerSymbol{
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get{
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if (SymbolCount <= 1){
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return 0;
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}
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return Log2.Floor(SymbolCount - 1) + 1;
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}
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}
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/// <summary>
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/// Amount of symbols in the alphabet.
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/// </summary>
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public int SymbolCount { get; }
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public AlphabetSize(int symbolCount){
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if (symbolCount < 0){
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throw new ArgumentOutOfRangeException(nameof(symbolCount), "Alphabet cannot have a negative amount of symbols.");
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}
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this.SymbolCount = symbolCount;
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}
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// Object
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public override bool Equals(object obj){
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var size = obj as AlphabetSize?;
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return SymbolCount == size?.SymbolCount;
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}
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public override int GetHashCode(){
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return HashCode.Combine(SymbolCount);
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}
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public override string ToString(){
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return "SymbolCount = " + SymbolCount + " (BitsPerSymbol = " + BitsPerSymbol + ")";
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}
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}
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}
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