ParsePrimitiveBitStringContents()

static void System.Formats.Asn1.AsnDecoder.ParsePrimitiveBitStringContents ( ReadOnlySpan< byte > source, AsnEncodingRules ruleSet, out int unusedBitCount, out ReadOnlySpan< byte > value, out byte normalizedLastByte )

inlinestaticprivate

Definition at line 457 of file AsnDecoder.cs.

    {
        if (ruleSet == AsnEncodingRules.CER && source.Length > 1000)
        {
            throw new AsnContentException(System.SR.ContentException_InvalidUnderCer_TryBerOrDer);
        }
        if (source.Length == 0)
        {
            throw new AsnContentException();
        }
        unusedBitCount = source[0];
        if (unusedBitCount > 7)
        {
            throw new AsnContentException();
        }
        if (source.Length == 1)
        {
            if (unusedBitCount > 0)
            {
                throw new AsnContentException();
            }
            value = ReadOnlySpan<byte>.Empty;
            normalizedLastByte = 0;
            return;
        }
        int num = -1 << unusedBitCount;
        byte b = source[source.Length - 1];
        byte b2 = (byte)(b & num);
        if (b2 != b && (ruleSet == AsnEncodingRules.DER || ruleSet == AsnEncodingRules.CER))
        {
            throw new AsnContentException(System.SR.ContentException_InvalidUnderCerOrDer_TryBer);
        }
        normalizedLastByte = b2;
        value = source.Slice(1);
    }

References System.SR.ContentException_InvalidUnderCer_TryBerOrDer, System.SR.ContentException_InvalidUnderCerOrDer_TryBer, System.source, and System.value.

Referenced by System.Formats.Asn1.AsnDecoder.ProcessConstructedBitString(), and System.Formats.Asn1.AsnDecoder.TryReadPrimitiveBitStringCore().