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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Asn1
{
public abstract class Asn1OctetString
: Asn1Object, Asn1OctetStringParser
{
internal class Meta : Asn1UniversalType
{
internal static readonly Asn1UniversalType Instance = new Meta();
private Meta() : base(typeof(Asn1OctetString), Asn1Tags.OctetString) {}
internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
{
return octetString;
}
internal override Asn1Object FromImplicitConstructed(Asn1Sequence sequence)
{
return sequence.ToAsn1OctetString();
}
}
internal static readonly byte[] EmptyOctets = new byte[0];
/**
* 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)
return null;
if (obj is Asn1OctetString asn1OctetString)
return asn1OctetString;
if (obj is IAsn1Convertible asn1Convertible)
{
if (!(obj is Asn1Object) && asn1Convertible.ToAsn1Object() is Asn1OctetString converted)
return converted;
}
else if (obj is byte[] bytes)
{
try
{
return (Asn1OctetString)Meta.Instance.FromByteArray(bytes);
}
catch (IOException e)
{
throw new ArgumentException("failed to construct OCTET STRING from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj), "obj");
}
/**
* return an octet 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 Asn1OctetString GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return (Asn1OctetString)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
}
public static Asn1OctetString GetOptional(Asn1Encodable element)
{
if (element == null)
throw new ArgumentNullException(nameof(element));
if (element is Asn1OctetString existing)
return existing;
if (element is IAsn1Convertible asn1Convertible && !(element is Asn1Object) &&
asn1Convertible.ToAsn1Object() is Asn1OctetString converted)
{
return converted;
}
return null;
}
internal readonly byte[] contents;
/**
* @param string the octets making up the octet string.
*/
internal Asn1OctetString(byte[] contents)
{
if (null == contents)
throw new ArgumentNullException("contents");
this.contents = contents;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal Asn1OctetString(ReadOnlySpan<byte> contents)
{
this.contents = contents.ToArray();
}
#endif
public Stream GetOctetStream()
{
return new MemoryStream(contents, false);
}
public Asn1OctetStringParser Parser
{
get { return this; }
}
public virtual byte[] GetOctets()
{
return contents;
}
public virtual int GetOctetsLength() => GetOctets().Length;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal ReadOnlyMemory<byte> GetOctetsMemory()
{
return GetOctets().AsMemory();
}
internal ReadOnlySpan<byte> GetOctetsSpan()
{
return GetOctets().AsSpan();
}
#endif
protected override int Asn1GetHashCode()
{
return Arrays.GetHashCode(GetOctets());
}
protected override bool Asn1Equals(Asn1Object asn1Object)
{
return asn1Object is Asn1OctetString that
&& Arrays.AreEqual(this.GetOctets(), that.GetOctets());
}
public override string ToString()
{
return "#" + Hex.ToHexString(contents);
}
internal static Asn1OctetString CreatePrimitive(byte[] contents)
{
return new DerOctetString(contents);
}
}
}
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