Initial Commit

iTechSharp/srcbc/asn1/DerPrintableString.cs

@@ -0,0 +1,164 @@
+using System;
+using System.Text;
+
+namespace Org.BouncyCastle.Asn1
+{
+    /**
+     * Der PrintableString object.
+     */
+    public class DerPrintableString
+        : DerStringBase
+    {
+        private readonly string str;
+
+		/**
+         * return a printable string from the passed in object.
+         *
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static DerPrintableString GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is DerPrintableString)
+            {
+                return (DerPrintableString)obj;
+            }
+
+            if (obj is Asn1OctetString)
+            {
+                return new DerPrintableString(((Asn1OctetString)obj).GetOctets());
+            }
+
+            if (obj is Asn1TaggedObject)
+            {
+                return GetInstance(((Asn1TaggedObject)obj).GetObject());
+            }
+
+            throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name);
+        }
+
+        /**
+         * return a Printable string from a tagged object.
+         *
+         * @param obj the tagged object holding the object we want
+         * @param explicitly true if the object is meant to be explicitly
+         *              tagged false otherwise.
+         * @exception ArgumentException if the tagged object cannot
+         *               be converted.
+         */
+        public static DerPrintableString GetInstance(
+            Asn1TaggedObject	obj,
+            bool				explicitly)
+        {
+            return GetInstance(obj.GetObject());
+        }
+
+        /**
+         * basic constructor - byte encoded string.
+         */
+        public DerPrintableString(
+            byte[] str)
+			: this(Encoding.ASCII.GetString(str, 0, str.Length), false)
+        {
+        }
+
+		/**
+		 * basic constructor - this does not validate the string
+		 */
+		public DerPrintableString(
+			string str)
+			: this(str, false)
+		{
+		}
+
+		/**
+		* Constructor with optional validation.
+		*
+		* @param string the base string to wrap.
+		* @param validate whether or not to check the string.
+		* @throws ArgumentException if validate is true and the string
+		* contains characters that should not be in a PrintableString.
+		*/
+		public DerPrintableString(
+			string	str,
+			bool	validate)
+		{
+			if (str == null)
+				throw new ArgumentNullException("str");
+			if (validate && !IsPrintableString(str))
+				throw new ArgumentException("string contains illegal characters", "str");
+
+			this.str = str;
+		}
+
+		public override string GetString()
+        {
+            return str;
+        }
+
+		public byte[] GetOctets()
+        {
+			return Encoding.ASCII.GetBytes(str);
+        }
+
+		internal override void Encode(
+            DerOutputStream derOut)
+        {
+            derOut.WriteEncoded(Asn1Tags.PrintableString, GetOctets());
+        }
+
+		protected override bool Asn1Equals(
+			Asn1Object asn1Object)
+		{
+			DerPrintableString other = asn1Object as DerPrintableString;
+
+			if (other == null)
+				return false;
+
+			return this.str.Equals(other.str);
+        }
+
+		/**
+		 * return true if the passed in String can be represented without
+		 * loss as a PrintableString, false otherwise.
+		 *
+		 * @return true if in printable set, false otherwise.
+		 */
+		public static bool IsPrintableString(
+			string str)
+		{
+			foreach (char ch in str)
+			{
+				if (ch > 0x007f)
+					return false;
+
+				if (char.IsLetterOrDigit(ch))
+					continue;
+
+//				if (char.IsPunctuation(ch))
+//					continue;
+
+				switch (ch)
+				{
+					case ' ':
+					case '\'':
+					case '(':
+					case ')':
+					case '+':
+					case '-':
+					case '.':
+					case ':':
+					case '=':
+					case '?':
+					case '/':
+					case ',':
+						continue;
+				}
+
+				return false;
+			}
+
+			return true;
+		}
+	}
+}