1 files changed, 172 insertions, 0 deletions
diff --git a/crypto/src/asn1/x509/DisplayText.cs b/crypto/src/asn1/x509/DisplayText.cs
new file mode 100644
index 000000000..699f39031
--- /dev/null
+++ b/crypto/src/asn1/x509/DisplayText.cs
@@ -0,0 +1,172 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+	/**
+	 * <code>DisplayText</code> class, used in
+	 * <code>CertificatePolicies</code> X509 V3 extensions (in policy qualifiers).
+	 *
+	 * <p>It stores a string in a chosen encoding.
+	 * <pre>
+	 * DisplayText ::= CHOICE {
+	 *      ia5String        IA5String      (SIZE (1..200)),
+	 *      visibleString    VisibleString  (SIZE (1..200)),
+	 *      bmpString        BMPString      (SIZE (1..200)),
+	 *      utf8String       UTF8String     (SIZE (1..200)) }
+	 * </pre></p>
+	 * @see PolicyQualifierInfo
+	 * @see PolicyInformation
+	 */
+	public class DisplayText
+		: Asn1Encodable, IAsn1Choice
+	{
+		/**
+		 * Constant corresponding to ia5String encoding.
+		 *
+		 */
+		public const int ContentTypeIA5String = 0;
+		/**
+		 * Constant corresponding to bmpString encoding.
+		 *
+		 */
+		public const int ContentTypeBmpString = 1;
+		/**
+		 * Constant corresponding to utf8String encoding.
+		 *
+		 */
+		public const int ContentTypeUtf8String = 2;
+		/**
+		 * Constant corresponding to visibleString encoding.
+		 *
+		 */
+		public const int ContentTypeVisibleString = 3;
+		/**
+		 * Describe constant <code>DisplayTextMaximumSize</code> here.
+		 *
+		 */
+		public const int DisplayTextMaximumSize = 200;
+
+		internal readonly int contentType;
+		internal readonly IAsn1String contents;
+
+		/**
+		 * Creates a new <code>DisplayText</code> instance.
+		 *
+		 * @param type the desired encoding type for the text.
+		 * @param text the text to store. Strings longer than 200
+		 * characters are truncated.
+		 */
+		public DisplayText(
+			int		type,
+			string	text)
+		{
+			if (text.Length > DisplayTextMaximumSize)
+			{
+				// RFC3280 limits these strings to 200 chars
+				// truncate the string
+				text = text.Substring(0, DisplayTextMaximumSize);
+			}
+
+			contentType = type;
+			switch (type)
+			{
+				case ContentTypeIA5String:
+					contents = (IAsn1String)new DerIA5String (text);
+					break;
+				case ContentTypeUtf8String:
+					contents = (IAsn1String)new DerUtf8String(text);
+					break;
+				case ContentTypeVisibleString:
+					contents = (IAsn1String)new DerVisibleString(text);
+					break;
+				case ContentTypeBmpString:
+					contents = (IAsn1String)new DerBmpString(text);
+					break;
+				default:
+					contents = (IAsn1String)new DerUtf8String(text);
+					break;
+			}
+		}
+
+//		/**
+//		 * return true if the passed in string can be represented without
+//		 * loss as a PrintableString, false otherwise.
+//		 */
+//		private bool CanBePrintable(
+//			string str)
+//		{
+//			for (int i = str.Length - 1; i >= 0; i--)
+//			{
+//				if (str[i] > 0x007f)
+//				{
+//					return false;
+//				}
+//			}
+//
+//			return true;
+//		}
+
+		/**
+		 * Creates a new <code>DisplayText</code> instance.
+		 *
+		 * @param text the text to encapsulate. Strings longer than 200
+		 * characters are truncated.
+		 */
+		public DisplayText(
+			string text)
+		{
+			// by default use UTF8String
+			if (text.Length > DisplayTextMaximumSize)
+			{
+				text = text.Substring(0, DisplayTextMaximumSize);
+			}
+
+			contentType = ContentTypeUtf8String;
+			contents = new DerUtf8String(text);
+		}
+
+		/**
+		 * Creates a new <code>DisplayText</code> instance.
+		 * <p>Useful when reading back a <code>DisplayText</code> class
+		 * from it's Asn1Encodable form.</p>
+		 *
+		 * @param contents an <code>Asn1Encodable</code> instance.
+		 */
+		public DisplayText(
+			IAsn1String contents)
+		{
+			this.contents = contents;
+		}
+
+		public static DisplayText GetInstance(
+			object obj)
+		{
+			if (obj is IAsn1String)
+			{
+				return new DisplayText((IAsn1String) obj);
+			}
+
+			if (obj is DisplayText)
+			{
+				return (DisplayText) obj;
+			}
+
+			throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+		}
+
+		public override Asn1Object ToAsn1Object()
+		{
+			return (Asn1Object) contents;
+		}
+
+		/**
+		 * Returns the stored <code>string</code> object.
+		 *
+		 * @return the stored text as a <code>string</code>.
+		 */
+		public string GetString()
+		{
+			return contents.GetString();
+		}
+	}
+}