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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Asn1
{
public abstract class Asn1OctetString
: Asn1Object, Asn1OctetStringParser
{
internal static readonly byte[] EmptyOctets = new byte[0];
internal byte[] str;
/**
* return an Octet 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 Asn1OctetString GetInstance(
Asn1TaggedObject obj,
bool isExplicit)
{
Asn1Object o = obj.GetObject();
if (isExplicit || o is Asn1OctetString)
{
return GetInstance(o);
}
return BerOctetString.FromSequence(Asn1Sequence.GetInstance(o));
}
/**
* return an Octet string from the given object.
*
* @param obj the object we want converted.
* @exception ArgumentException if the object cannot be converted.
*/
public static Asn1OctetString GetInstance(object obj)
{
if (obj == null || obj is Asn1OctetString)
{
return (Asn1OctetString)obj;
}
else if (obj is byte[])
{
try
{
return GetInstance(FromByteArray((byte[])obj));
}
catch (IOException e)
{
throw new ArgumentException("failed to construct OCTET STRING from byte[]: " + e.Message);
}
}
// TODO: this needs to be deleted in V2
else if (obj is Asn1TaggedObject)
{
return GetInstance(((Asn1TaggedObject)obj).GetObject());
}
else if (obj is Asn1Encodable)
{
Asn1Object primitive = ((Asn1Encodable)obj).ToAsn1Object();
if (primitive is Asn1OctetString)
{
return (Asn1OctetString)primitive;
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* @param string the octets making up the octet string.
*/
internal Asn1OctetString(
byte[] str)
{
if (str == null)
throw new ArgumentNullException("str");
this.str = str;
}
public Stream GetOctetStream()
{
return new MemoryStream(str, false);
}
public Asn1OctetStringParser Parser
{
get { return this; }
}
public virtual byte[] GetOctets()
{
return str;
}
protected override int Asn1GetHashCode()
{
return Arrays.GetHashCode(GetOctets());
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerOctetString other = asn1Object as DerOctetString;
if (other == null)
return false;
return Arrays.AreEqual(GetOctets(), other.GetOctets());
}
public override string ToString()
{
return "#" + Hex.ToHexString(str);
}
}
}
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