52 lines
1.7 KiB
C#
52 lines
1.7 KiB
C#
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using System;
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using System.Globalization;
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using System.IO;
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namespace PCL.Core.IO;
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public class ByteStream(Stream stream)
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{
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private static readonly string[] _Units = ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"];
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public long Length => stream.Length;
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public string GetReadableLength()
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{
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return GetReadableLength(Length);
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}
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/// <summary>
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/// 格式化大小
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/// </summary>
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/// <param name="length">字节</param>
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/// <param name="startUnit">开始单位</param>
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/// <param name="provider">格式化区域提供程序，默认使用 <see cref="CultureInfo.InvariantCulture" /></param>
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/// <returns></returns>
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/// <exception cref="ArgumentOutOfRangeException"></exception>
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public static string GetReadableLength(long length, int startUnit = 0, IFormatProvider? provider = null)
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{
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ArgumentOutOfRangeException.ThrowIfGreaterThanOrEqual(startUnit, _Units.Length);
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ArgumentOutOfRangeException.ThrowIfLessThan(startUnit, 0);
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var isNegative = length < 0;
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decimal absBytes = isNegative ? -length : length;
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if (absBytes == 0)
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return "0 B";
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var unitIndex = startUnit;
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var value = absBytes;
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while (value >= 1024 && unitIndex < _Units.Length - 1)
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{
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value /= 1024;
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unitIndex++;
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}
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if (unitIndex >= _Units.Length)
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throw new ArgumentOutOfRangeException(nameof(length),
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"Value too large for predefined units.");
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var sign = isNegative ? "-" : "";
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return $"{sign}{value.ToString("0.##", provider ?? CultureInfo.InvariantCulture)} {_Units[unitIndex]}";
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}
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}
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