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using System;
using System.Diagnostics;
namespace Org.BouncyCastle.Asn1
{
internal class PrimitiveDerEncodingSuffixed
: DerEncoding
{
private readonly byte[] m_contentsOctets;
private readonly byte m_contentsSuffix;
internal PrimitiveDerEncodingSuffixed(int tagClass, int tagNo, byte[] contentsOctets, byte contentsSuffix)
: base(tagClass, tagNo)
{
Debug.Assert(contentsOctets != null);
Debug.Assert(contentsOctets.Length > 0);
m_contentsOctets = contentsOctets;
m_contentsSuffix = contentsSuffix;
}
protected internal override int CompareLengthAndContents(DerEncoding other)
{
if (other is PrimitiveDerEncodingSuffixed suff)
{
return CompareSuffixed(this.m_contentsOctets, this.m_contentsSuffix,
suff.m_contentsOctets, suff.m_contentsSuffix);
}
else if (other is PrimitiveDerEncoding that)
{
int length = that.m_contentsOctets.Length;
if (length == 0)
return this.m_contentsOctets.Length;
return CompareSuffixed(this.m_contentsOctets, this.m_contentsSuffix,
that.m_contentsOctets, that.m_contentsOctets[length - 1]);
}
else
{
throw new InvalidOperationException();
}
}
public override void Encode(Asn1OutputStream asn1Out)
{
asn1Out.WriteIdentifier(m_tagClass, m_tagNo);
asn1Out.WriteDL(m_contentsOctets.Length);
asn1Out.Write(m_contentsOctets, 0, m_contentsOctets.Length - 1);
asn1Out.WriteByte(m_contentsSuffix);
}
public override int GetLength()
{
return Asn1OutputStream.GetLengthOfEncodingDL(m_tagNo, m_contentsOctets.Length);
}
private static int CompareSuffixed(byte[] octetsA, byte suffixA, byte[] octetsB, byte suffixB)
{
Debug.Assert(octetsA.Length > 0);
Debug.Assert(octetsB.Length > 0);
int length = octetsA.Length;
if (length != octetsB.Length)
return length - octetsB.Length;
int last = length - 1;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
int c = octetsA.AsSpan(0, last).SequenceCompareTo(
octetsB.AsSpan(0, last));
if (c != 0)
return c;
#else
for (int i = 0; i < last; i++)
{
byte ai = octetsA[i], bi = octetsB[i];
if (ai != bi)
return ai - bi;
}
#endif
return suffixA - suffixB;
}
}
}
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