/// <summary>
/// Parses the string to determine a memory size. NOTE: Using a floating point number will likely result in a small amount of imprecision. Do not rely on the byte count being exact.
/// </summary>
/// <param name="fmt">A string that starts with a number and ends with one of the supported format strings. Ex 123GiB</param>
/// <param name="outSz">Output parameter.</param>
/// <returns></returns>
public static bool TryParse(string fmt, out MemSize outSz)
{
return(TryParse(fmt, false, out outSz));
}
/// <summary>
/// Parses the string to determine a memory size. NOTE: Using a floating point number will likely result in a small amount of imprecision. Do not rely on the byte count being exact.
/// </summary>
/// <param name="fmt">A string that starts with a number and ends with one of the supported format strings. Ex 123GiB</param>
/// <param name="useIEC">If true, always uses IEC format. So sending in 1KB is interpreted as 1KiB.</param>
/// <param name="outSz">Output parameter.</param>
/// <returns></returns>
public static bool TryParse(string fmt, bool useIEC, out MemSize outSz)
{
outSz = null;
if (fmt.IsEmpty())
{
return(false);
}
var re = new Regex(@"^(?<sz>\d+(\.\d+)?)(\s?(?<fmt>[A-Z]+))?$", RegexOptions.IgnoreCase);
var m = re.Match(fmt);
if (!m.Success)
{
return(false);
}
if (decimal.TryParse(m.Groups["sz"].Value, out var fmtSz))
{
var fmtDesignator = m.Groups["fmt"].Value ?? "";
switch (fmtDesignator.ToUpperInvariant())
{
case "":
case "B":
case "BYTE":
case "BYTES":
; // Leave sz alone
break;
case "TIB":
fmtSz *= cNumBytesInTebibyte;
break;
case "GIB":
fmtSz *= cNumBytesInGibibyte;
break;
case "MIB":
fmtSz *= cNumBytesInMebibyte;
break;
case "KIB":
fmtSz *= cNumBytesInKibibyte;
break;
case "TB":
fmtSz *= useIEC ? cNumBytesInTebibyte : cNumBytesInTerabyte;
break;
case "GB":
fmtSz *= useIEC ? cNumBytesInGibibyte : cNumBytesInGigabyte;
break;
case "MB":
fmtSz *= useIEC ? cNumBytesInMebibyte : cNumBytesInMegabyte;
break;
case "KB":
fmtSz *= useIEC ? cNumBytesInKibibyte : cNumBytesInKilobyte;
break;
default:
return(false);
}
outSz = new MemSize((int)Math.Round(fmtSz, 0));
return(true);
}
return(false);
}
/// <summary>
/// Returns a string representation of the size.
/// </summary>
/// <param name="totalBytes"></param>
/// <param name="format">Can be IEC, SI (see http://en.wikipedia.org/wiki/Binary_prefix), KB, MB, GB, TB, KiB, MiB, GiB, or TiB. If null, IEC is assumed. Any other values will show the total number of bytes. If you want an IEC value with an SI prefix (old style), add a * to the format (ex, "IEC*"). This is ignored if using an SI format.</param>
/// <returns></returns>
public static string GetString(long totalBytes, string format)
{
var sz = new MemSize(totalBytes);
return(sz.ToString(format));
}
