ModernKeePassLib custom PCL version

ModernKeePassLib/Utility/ColorTranslator.cs

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+using System;
+using System.Drawing;
+using System.Globalization;
+using System.Text.RegularExpressions;
+
+namespace KeePass2PCL.Utility
+{
+	/// <summary>
+	/// Replacement for System.Drawing.ColorTranslator.
+	/// </summary>
+	/// <remarks>
+	/// Colors are stored in the kdbx database file in HTML format (#XXXXXX).
+	/// </remarks>
+	public static class ColorTranslator
+	{
+		static Regex longForm = new Regex("^#([0-9A-Fa-f]{2})([0-9A-Fa-f]{2})([0-9A-Fa-f]{2})$");
+
+		/// <summary>
+		/// Converts an HTML color value to a Color.
+		/// </summary>
+		/// <returns>The Color.</returns>
+		/// <param name="htmlColor">HTML color code.</param>
+		/// <exception cref="ArgumentNullException">If htmlColor is null.</exception>
+		/// <exception cref="ArgumentException">If htmlColor did not match the pattern "#XXXXXX".</exception>
+		/// <remarks>
+		/// Currently only understands "#XXXXXX". "#XXX" or named colors will
+		/// throw and exception.
+		/// </remarks>
+		public static Color FromHtml(string htmlColor)
+		{
+			if (htmlColor == null)
+				throw new ArgumentNullException("htmlColor");
+			Match match = longForm.Match(htmlColor);
+			if (match.Success) {
+				var r = int.Parse(match.Groups[1].Value, NumberStyles.HexNumber);
+				var g = int.Parse(match.Groups[2].Value, NumberStyles.HexNumber);
+				var b = int.Parse(match.Groups[3].Value, NumberStyles.HexNumber);
+				return Color.FromArgb(r, g, b);
+			}
+			throw new ArgumentException(string.Format("Could not parse HTML color '{0}'.", htmlColor), "htmlColor");
+		}
+
+		/// <summary>
+		/// Converts a color to an HTML color code.
+		/// </summary>
+		/// <returns>String containing the color code.</returns>
+		/// <param name="htmlColor">The Color to convert</param>
+		/// <remarks>
+		/// The string is in the format "#XXXXXX"
+		/// </remarks>
+		public static string ToHtml(Color htmlColor)
+		{
+			return string.Format("#{0:x2}{1:x2}{2:x2}", htmlColor.R, htmlColor.G, htmlColor.B);
+		}
+	}
+}
+