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using System;
using System.Diagnostics;
using System.IO;
namespace Org.BouncyCastle.Asn1
{
public abstract class Asn1Object
: Asn1Encodable
{
public override void EncodeTo(Stream output)
{
using (var asn1Out = Asn1OutputStream.Create(output, Ber, leaveOpen: true))
{
GetEncoding(asn1Out.Encoding).Encode(asn1Out);
}
}
public override void EncodeTo(Stream output, string encoding)
{
using (var asn1Out = Asn1OutputStream.Create(output, encoding, leaveOpen: true))
{
GetEncoding(asn1Out.Encoding).Encode(asn1Out);
}
}
internal virtual byte[] InternalGetEncoded(string encoding)
{
var encodingType = Asn1OutputStream.GetEncodingType(encoding);
var asn1Encoding = GetEncoding(encodingType);
byte[] result = new byte[asn1Encoding.GetLength()];
using (var asn1Out = Asn1OutputStream.Create(new MemoryStream(result, true), encoding))
{
asn1Encoding.Encode(asn1Out);
Debug.Assert(result.Length == Convert.ToInt32(asn1Out.Position));
}
return result;
}
public bool Equals(Asn1Object other)
{
return this == other || Asn1Equals(other);
}
/// <summary>Create a base ASN.1 object from a byte array.</summary>
/// <param name="data">The byte array to parse.</param>
/// <returns>The base ASN.1 object represented by the byte array.</returns>
/// <exception cref="IOException">
/// If there is a problem parsing the data, or parsing an object did not exhaust the available data.
/// </exception>
public static Asn1Object FromByteArray(byte[] data)
{
try
{
using (var asn1In = new Asn1InputStream(new MemoryStream(data, false), data.Length))
{
Asn1Object result = asn1In.ReadObject();
if (data.Length != asn1In.Position)
throw new IOException("extra data found after object");
return result;
}
}
catch (InvalidCastException)
{
throw new IOException("cannot recognise object in byte array");
}
}
/// <summary>Read a base ASN.1 object from a stream.</summary>
/// <param name="inStr">The stream to parse.</param>
/// <returns>The base ASN.1 object represented by the byte array.</returns>
/// <exception cref="IOException">If there is a problem parsing the data.</exception>
public static Asn1Object FromStream(Stream inStr)
{
try
{
return new Asn1InputStream(inStr).ReadObject();
}
catch (InvalidCastException)
{
throw new IOException("cannot recognise object in stream");
}
}
public sealed override Asn1Object ToAsn1Object()
{
return this;
}
internal abstract IAsn1Encoding GetEncoding(int encoding);
internal abstract IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo);
protected abstract bool Asn1Equals(Asn1Object asn1Object);
protected abstract int Asn1GetHashCode();
internal bool CallAsn1Equals(Asn1Object obj)
{
return Asn1Equals(obj);
}
internal int CallAsn1GetHashCode()
{
return Asn1GetHashCode();
}
}
}
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