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using System;
using System.Text;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
/**
* Der UTF8String object.
*/
public class DerUtf8String
: DerStringBase
{
private readonly string str;
/**
* return an UTF8 string from the passed in object.
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerUtf8String GetInstance(
object obj)
{
if (obj == null || obj is DerUtf8String)
{
return (DerUtf8String)obj;
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return an UTF8 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 DerUtf8String GetInstance(
Asn1TaggedObject obj,
bool isExplicit)
{
Asn1Object o = obj.GetObject();
if (isExplicit || o is DerUtf8String)
{
return GetInstance(o);
}
return new DerUtf8String(Asn1OctetString.GetInstance(o).GetOctets());
}
/**
* basic constructor - byte encoded string.
*/
public DerUtf8String(
byte[] str)
: this(Encoding.UTF8.GetString(str, 0, str.Length))
{
}
/**
* basic constructor
*/
public DerUtf8String(
string str)
{
if (str == null)
throw new ArgumentNullException("str");
this.str = str;
}
public override string GetString()
{
return str;
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerUtf8String other = asn1Object as DerUtf8String;
if (other == null)
return false;
return this.str.Equals(other.str);
}
internal override int EncodedLength(bool withID)
{
return Asn1OutputStream.GetLengthOfEncodingDL(withID, Encoding.UTF8.GetByteCount(str));
}
internal override void Encode(Asn1OutputStream asn1Out, bool withID)
{
asn1Out.WriteEncodingDL(withID, Asn1Tags.Utf8String, Encoding.UTF8.GetBytes(str));
}
}
}
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