mirror of https://github.com/dahall/Vanara.git
102 lines
3.7 KiB
C#
102 lines
3.7 KiB
C#
using System;
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namespace Vanara
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{
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/// <summary>
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/// A custom formatter for byte sizes (things like files, network bandwidth, etc.) that will automatically determine the best abbreviation.
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/// </summary>
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public class ByteSizeFormatter : Formatter
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{
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private static readonly string[] suffixes = { " B", " KB", " MB", " GB", " TB", " PB", " EB" };
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/// <summary>A static instance of <see cref="ByteSizeFormatter"/>.</summary>
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public static readonly ByteSizeFormatter Instance = new ByteSizeFormatter();
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/// <summary>
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/// Converts the value of a specified object to an equivalent string representation using specified format and culture-specific
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/// formatting information.
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/// </summary>
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/// <param name="format">A format string containing formatting specifications.</param>
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/// <param name="arg">An object to format.</param>
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/// <param name="formatProvider">An object that supplies format information about the current instance.</param>
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/// <returns>
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/// The string representation of the value of <paramref name="arg"/>, formatted as specified by <paramref name="format"/> and
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/// <paramref name="formatProvider"/>.
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/// </returns>
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public override string Format(string format, object arg, IFormatProvider formatProvider)
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{
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long bytes;
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try { bytes = Convert.ToInt64(arg); }
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catch { return HandleOtherFormats(format, arg); }
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if (bytes == 0) return "0" + suffixes[0];
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var m = System.Text.RegularExpressions.Regex.Match(format, @"^[B|b](?<prec>\d+)?$");
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if (!m.Success) return HandleOtherFormats(format, arg);
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var prec = m.Groups["prec"].Success ? byte.Parse(m.Groups["prec"].Value) : 0;
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var place = Convert.ToInt32(Math.Floor(Math.Log(bytes, 1024)));
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if (place >= suffixes.Length) place = suffixes.Length - 1;
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var num = Math.Round(bytes / Math.Pow(1024, place), 1);
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return $"{num.ToString("F" + prec).TrimEnd('0')}{suffixes[place]}";
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}
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/// <summary>
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/// Converts the string representation of a byte size to its 64-bit signed integer equivalent. A return value indicates whether the
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/// conversion succeeded.
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/// </summary>
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/// <param name="input">A string containing a byte size to convert.</param>
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/// <param name="bytes">
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/// When this method returns, contains the 64-bit signed integer value equivalent of the value contained in <paramref name="input"/>,
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/// if the conversion succeeded, or zero if the conversion failed. The conversion fails if the <paramref name="input"/> parameter is
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/// null or Empty, or is not of the correct format. This parameter is passed uninitialized; any value originally supplied in result
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/// will be overwritten.
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/// </param>
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/// <returns><see langword="true"/> if <paramref name="input"/> was converted successfully; otherwise, <see langword="false"/>.</returns>
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/// <exception cref="InvalidOperationException"></exception>
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public static bool TryParse(string input, out long bytes)
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{
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const string expr = @"^\s*(?<num>\d+(?:\.\d+)?)\s*(?<mod>[kKmMgGtTpPeEyY]?[bB])?\s*$";
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var match = System.Text.RegularExpressions.Regex.Match(input, expr);
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bytes = 0;
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if (!match.Success) return false;
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long mult = 1;
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switch (match.Groups["mod"].Value.ToUpper())
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{
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case "B":
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case "":
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break;
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case "KB":
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mult = 1024;
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break;
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case "MB":
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mult = (long)Math.Pow(1024, 2);
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break;
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case "GB":
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mult = (long)Math.Pow(1024, 3);
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break;
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case "TB":
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mult = (long)Math.Pow(1024, 4);
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break;
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case "PB":
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mult = (long)Math.Pow(1024, 5);
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break;
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case "EB":
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mult = (long)Math.Pow(1024, 6);
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break;
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case "YB":
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mult = (long)Math.Pow(1024, 7);
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break;
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default:
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throw new InvalidOperationException();
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}
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bytes = (long)Math.Round(float.Parse(match.Groups["num"].Value) * mult);
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return true;
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}
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}
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} |