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139
iTechSharp/srcbc/asn1/DerNumericString.cs
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139
iTechSharp/srcbc/asn1/DerNumericString.cs
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using System;
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using System.Text;
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namespace Org.BouncyCastle.Asn1
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{
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/**
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* Der NumericString object - this is an ascii string of characters {0,1,2,3,4,5,6,7,8,9, }.
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*/
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public class DerNumericString
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: DerStringBase
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{
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private readonly string str;
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/**
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* return a Numeric string from the passed in object
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*
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* @exception ArgumentException if the object cannot be converted.
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*/
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public static DerNumericString GetInstance(
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object obj)
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{
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if (obj == null || obj is DerNumericString)
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{
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return (DerNumericString)obj;
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}
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if (obj is Asn1OctetString)
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{
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return new DerNumericString(((Asn1OctetString)obj).GetOctets());
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}
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if (obj is Asn1TaggedObject)
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{
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return GetInstance(((Asn1TaggedObject)obj).GetObject());
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}
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throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name);
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}
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/**
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* return an Numeric string from a tagged object.
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*
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* @param obj the tagged object holding the object we want
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* @param explicitly true if the object is meant to be explicitly
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* tagged false otherwise.
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* @exception ArgumentException if the tagged object cannot
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* be converted.
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*/
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public static DerNumericString GetInstance(
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Asn1TaggedObject obj,
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bool explicitly)
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{
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return GetInstance(obj.GetObject());
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}
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/**
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* basic constructor - with bytes.
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*/
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public DerNumericString(
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byte[] str)
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: this(Encoding.ASCII.GetString(str, 0, str.Length), false)
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{
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}
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/**
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* basic constructor - without validation..
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*/
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public DerNumericString(
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string str)
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: this(str, false)
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{
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}
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/**
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* Constructor with optional validation.
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*
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* @param string the base string to wrap.
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* @param validate whether or not to check the string.
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* @throws ArgumentException if validate is true and the string
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* contains characters that should not be in a NumericString.
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*/
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public DerNumericString(
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string str,
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bool validate)
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{
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if (str == null)
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throw new ArgumentNullException("str");
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if (validate && !IsNumericString(str))
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throw new ArgumentException("string contains illegal characters", "str");
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this.str = str;
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}
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public override string GetString()
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{
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return str;
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}
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public byte[] GetOctets()
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{
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return Encoding.ASCII.GetBytes(str);
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}
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internal override void Encode(
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DerOutputStream derOut)
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{
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derOut.WriteEncoded(Asn1Tags.NumericString, GetOctets());
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}
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protected override bool Asn1Equals(
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Asn1Object asn1Object)
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{
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DerNumericString other = asn1Object as DerNumericString;
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if (other == null)
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return false;
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return this.str.Equals(other.str);
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}
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/**
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* Return true if the string can be represented as a NumericString ('0'..'9', ' ')
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*
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* @param str string to validate.
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* @return true if numeric, fale otherwise.
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*/
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public static bool IsNumericString(
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string str)
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{
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foreach (char ch in str)
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{
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if (ch > 0x007f || (ch != ' ' && !char.IsDigit(ch)))
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return false;
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}
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return true;
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}
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}
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}
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