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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
/**
* Der UTF8String object.
*/
public class DerUtf8String
: DerStringBase
{
internal class Meta : Asn1UniversalType
{
internal static readonly Asn1UniversalType Instance = new Meta();
private Meta() : base(typeof(DerUtf8String), Asn1Tags.Utf8String) {}
internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
{
return CreatePrimitive(octetString.GetOctets());
}
}
/**
* 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;
}
else if (obj is IAsn1Convertible)
{
Asn1Object asn1Object = ((IAsn1Convertible)obj).ToAsn1Object();
if (asn1Object is DerUtf8String)
return (DerUtf8String)asn1Object;
}
else if (obj is byte[])
{
try
{
return (DerUtf8String)Meta.Instance.FromByteArray((byte[])obj);
}
catch (IOException e)
{
throw new ArgumentException("failed to construct UTF8 string from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return a UTF8 string from a tagged object.
*
* @param taggedObject the tagged object holding the object we want
* @param declaredExplicit 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 taggedObject, bool declaredExplicit)
{
return (DerUtf8String)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
}
private readonly byte[] m_contents;
public DerUtf8String(string str)
: this(Strings.ToUtf8ByteArray(str), false)
{
}
public DerUtf8String(byte[] contents)
: this(contents, true)
{
}
internal DerUtf8String(byte[] contents, bool clone)
{
if (null == contents)
throw new ArgumentNullException("contents");
m_contents = clone ? Arrays.Clone(contents) : contents;
}
public override string GetString()
{
return Strings.FromUtf8ByteArray(m_contents);
}
protected override bool Asn1Equals(Asn1Object asn1Object)
{
DerUtf8String that = asn1Object as DerUtf8String;
return null != that
&& Arrays.AreEqual(this.m_contents, that.m_contents);
}
protected override int Asn1GetHashCode()
{
return Arrays.GetHashCode(m_contents);
}
internal override IAsn1Encoding GetEncoding(int encoding)
{
return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.Utf8String, m_contents);
}
internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
{
return new PrimitiveEncoding(tagClass, tagNo, m_contents);
}
internal static DerUtf8String CreatePrimitive(byte[] contents)
{
return new DerUtf8String(contents, false);
}
}
}
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