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using System;
using System.Diagnostics;
namespace Org.BouncyCastle.Asn1
{
public class BerOctetString
: DerOctetString
{
public static BerOctetString FromSequence(Asn1Sequence seq)
{
return new BerOctetString(seq.MapElements(GetInstance));
}
internal static byte[] FlattenOctetStrings(Asn1OctetString[] octetStrings)
{
int count = octetStrings.Length;
switch (count)
{
case 0:
return EmptyOctets;
case 1:
return octetStrings[0].contents;
default:
{
int totalOctets = 0;
for (int i = 0; i < count; ++i)
{
totalOctets += octetStrings[i].contents.Length;
}
byte[] str = new byte[totalOctets];
int pos = 0;
for (int i = 0; i < count; ++i)
{
byte[] octets = octetStrings[i].contents;
Array.Copy(octets, 0, str, pos, octets.Length);
pos += octets.Length;
}
Debug.Assert(pos == totalOctets);
return str;
}
}
}
private readonly Asn1OctetString[] elements;
public BerOctetString(byte[] contents)
: this(contents, null)
{
}
public BerOctetString(Asn1OctetString[] elements)
: this(FlattenOctetStrings(elements), elements)
{
}
[Obsolete("Use version without segmentLimit (which is ignored anyway)")]
public BerOctetString(byte[] contents, int segmentLimit)
: this(contents)
{
}
[Obsolete("Use version without segmentLimit (which is ignored anyway)")]
public BerOctetString(Asn1OctetString[] elements, int segmentLimit)
: this(elements)
{
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal BerOctetString(ReadOnlySpan<byte> contents)
: base(contents)
{
this.elements = null;
}
#endif
private BerOctetString(byte[] contents, Asn1OctetString[] elements)
: base(contents)
{
this.elements = elements;
}
internal override IAsn1Encoding GetEncoding(int encoding)
{
if (Asn1OutputStream.EncodingBer != encoding)
return base.GetEncoding(encoding);
if (null == elements)
return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.OctetString, contents);
return new ConstructedILEncoding(Asn1Tags.Universal, Asn1Tags.OctetString,
Asn1OutputStream.GetContentsEncodings(encoding, elements));
}
internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
{
if (Asn1OutputStream.EncodingBer != encoding)
return base.GetEncodingImplicit(encoding, tagClass, tagNo);
if (null == elements)
return new PrimitiveEncoding(tagClass, tagNo, contents);
return new ConstructedILEncoding(tagClass, tagNo,
Asn1OutputStream.GetContentsEncodings(encoding, elements));
}
}
}
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