124 lines
4.2 KiB
C#
124 lines
4.2 KiB
C#
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///////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: Libraries\Services\Helpers.cs
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//
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// Note:
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//
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using System;
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using System.IO;
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using System.Text;
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namespace FileSystem.Utils
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{
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public static class DiskSizeUtils
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{
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internal struct Quantity
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{
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internal ulong Unit;
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internal string! Suffix;
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internal Quantity(ulong u, string! s)
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{
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Unit = u;
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Suffix = s;
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}
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internal static readonly Quantity[]! KnownDisplayQuantities = new Quantity[] {
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new Quantity(1152921504606846976, "EiB"),
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new Quantity(1125899906842624, "PiB"),
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new Quantity(1099511627776, "TiB"),
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new Quantity(1073741824, "GiB"),
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new Quantity(1048576, "MiB"),
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new Quantity(1024, "KiB"),
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};
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internal static readonly Quantity[]! KnownParseQuantities = new Quantity[] {
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// Binary units
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new Quantity(1152921504606846976, "EiB"),
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new Quantity(1125899906842624, "PiB"),
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new Quantity(1099511627776, "TiB"),
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new Quantity(1073741824, "GiB"),
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new Quantity(1048576, "MiB"),
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new Quantity(1024, "KiB"),
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// Metric units
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new Quantity(1000000000000000000, "EB"),
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new Quantity(1000000000000000, "PB"),
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new Quantity(1000000000000, "TB"),
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new Quantity(1000000000, "GB"),
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new Quantity(1000000, "MB"),
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new Quantity(1000, "KB"),
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// Use binary units for the casual ones like "10K"
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new Quantity(1152921504606846976, "E"),
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new Quantity(1125899906842624, "P"),
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new Quantity(1099511627776, "T"),
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new Quantity(1073741824, "G"),
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new Quantity(1048576, "M"),
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new Quantity(1024, "K"),
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// Binary units for bits, converted to bytes
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new Quantity(144115188075855872, "Eb"),
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new Quantity(140737488355328, "Pb"),
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new Quantity(137438953472, "Tb"),
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new Quantity(134217728, "Gb"),
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new Quantity(131072, "Mb"),
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new Quantity(128, "Kb"),
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new Quantity(1, "B"),
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new Quantity(1, "")
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};
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}
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public static string GetPrettySizeString(ulong diskSize)
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{
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string suffix = "B";
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ulong divisor = 1;
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Quantity[] quantities = Quantity.KnownDisplayQuantities;
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for (int i = 0; i < quantities.Length; i++) {
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if (diskSize >= 1 * quantities[i].Unit) {
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divisor = quantities[i].Unit;
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suffix = quantities[i].Suffix;
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break;
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}
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}
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return String.Format("{0:F0} {1}",
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(float)diskSize / (float)divisor, suffix);
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}
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public static ulong ParsePrettySizeString(string! diskSizeStr)
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{
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ulong multiplier = 1, numUnits;
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Quantity[] quantities = Quantity.KnownParseQuantities;
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for (int i = 0; i < quantities.Length; i++) {
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if (diskSizeStr.EndsWith(quantities[i].Suffix)) {
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// Would use TryParse() if we had .NET Framework 2.0
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try {
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numUnits = ulong.Parse(
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diskSizeStr.Substring(0, diskSizeStr.Length -
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quantities[i].Suffix.Length));
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}
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catch (FormatException) {
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continue;
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}
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multiplier = quantities[i].Unit;
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return multiplier * numUnits;
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}
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}
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throw new FormatException();
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}
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}
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}
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