/// <summary>
/// Reads the next value as a Enumerated with a specified tag, returning the contents
/// as a <see cref="ReadOnlyMemory{T}"/> over the original data.
/// </summary>
/// <param name="expectedTag">The tag to check for before reading.</param>
/// <returns>
/// The bytes of the Enumerated value, in signed big-endian form.
/// </returns>
/// <exception cref="CryptographicException">
/// the next value does not have the correct tag --OR--
/// the length encoding is not valid under the current encoding rules --OR--
/// the contents are not valid under the current encoding rules
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="expectedTag"/>.<see cref="Asn1Tag.TagClass"/> is
/// <see cref="TagClass.Universal"/>, but
/// <paramref name="expectedTag"/>.<see cref="Asn1Tag.TagValue"/> is not correct for
/// the method
/// </exception>
/// <seealso cref="ReadEnumeratedValue{TEnum}(Asn1Tag)"/>
public ReadOnlyMemory <byte> ReadEnumeratedBytes(Asn1Tag expectedTag)
{
AsnValueReader valueReader = OpenValueReader();
ReadOnlySpan <byte> bytes = valueReader.ReadEnumeratedBytes(expectedTag);
ReadOnlyMemory <byte> memory = AsnValueReader.Slice(_data, bytes);
valueReader.MatchSlice(ref _data);
return(memory);
}
public bool TryReadPrimitiveBitStringValue(
Asn1Tag expectedTag,
out int unusedBitCount,
out ReadOnlyMemory <byte> value)
{
AsnValueReader reader = OpenValueReader();
if (reader.TryReadPrimitiveBitStringValue(expectedTag, out unusedBitCount, out ReadOnlySpan <byte> span))
{
value = AsnValueReader.Slice(_data, span);
reader.MatchSlice(ref _data);
return(true);
}
value = default;
return(false);
}
private bool TryReadPrimitiveOctetStringBytes(
Asn1Tag expectedTag,
UniversalTagNumber universalTagNumber,
out ReadOnlyMemory <byte> contents)
{
AsnValueReader valueReader = OpenValueReader();
ReadOnlySpan <byte> span;
if (valueReader.TryReadPrimitiveOctetStringBytes(expectedTag, universalTagNumber, out span))
{
contents = AsnValueReader.Slice(_data, span);
valueReader.MatchSlice(ref _data);
return(true);
}
contents = default;
return(false);
}
