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using System;
using System.Text;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
/**
* Der NumericString object - this is an ascii string of characters {0,1,2,3,4,5,6,7,8,9, }.
*/
public class DerNumericString
: DerStringBase
{
private readonly string str;
/**
* return a Numeric string from the passed in object
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerNumericString GetInstance(
object obj)
{
if (obj == null || obj is DerNumericString)
{
return (DerNumericString)obj;
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return an Numeric 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 DerNumericString GetInstance(
Asn1TaggedObject obj,
bool isExplicit)
{
Asn1Object o = obj.GetObject();
if (isExplicit || o is DerNumericString)
{
return GetInstance(o);
}
return new DerNumericString(Asn1OctetString.GetInstance(o).GetOctets());
}
/**
* basic constructor - with bytes.
*/
public DerNumericString(
byte[] str)
: this(Strings.FromAsciiByteArray(str), false)
{
}
/**
* basic constructor - without validation..
*/
public DerNumericString(
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 NumericString.
*/
public DerNumericString(
string str,
bool validate)
{
if (str == null)
throw new ArgumentNullException("str");
if (validate && !IsNumericString(str))
throw new ArgumentException("string contains illegal characters", "str");
this.str = str;
}
public override string GetString()
{
return str;
}
public byte[] GetOctets()
{
return Strings.ToAsciiByteArray(str);
}
internal override IAsn1Encoding GetEncoding(int encoding)
{
return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.NumericString, GetOctets());
}
internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
{
return new PrimitiveEncoding(tagClass, tagNo, GetOctets());
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerNumericString other = asn1Object as DerNumericString;
if (other == null)
return false;
return this.str.Equals(other.str);
}
/**
* Return true if the string can be represented as a NumericString ('0'..'9', ' ')
*
* @param str string to validate.
* @return true if numeric, fale otherwise.
*/
public static bool IsNumericString(
string str)
{
foreach (char ch in str)
{
if (ch > 0x007f || (ch != ' ' && !char.IsDigit(ch)))
return false;
}
return true;
}
}
}
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