CopyConstructedOctetString() [2/2]

static int System.Formats.Asn1.AsnDecoder.CopyConstructedOctetString ( ReadOnlySpan< byte > source, AsnEncodingRules ruleSet, Span< byte > destination, bool write, bool isIndefinite, out int bytesRead )

inlinestaticprivate

Definition at line 1281 of file AsnDecoder.cs.

    {
        bytesRead = 0;
        int num = 1000;
        ReadOnlySpan<byte> readOnlySpan = source;
        Stack<(int, int, bool, int)> stack = null;
        int num2 = 0;
        Asn1Tag asn1Tag = Asn1Tag.ConstructedBitString;
        Span<byte> destination2 = destination;
        while (true)
        {
            if (!readOnlySpan.IsEmpty)
            {
                asn1Tag = ReadTagAndLength(readOnlySpan, ruleSet, out var contentsLength, out var bytesRead2);
                if (asn1Tag == Asn1Tag.PrimitiveOctetString)
                {
                    if (ruleSet == AsnEncodingRules.CER && num != 1000)
                    {
                        throw new AsnContentException(System.SR.ContentException_InvalidUnderCerOrDer_TryBer);
                    }
                    ReadOnlySpan<byte> readOnlySpan2 = Slice(readOnlySpan, bytesRead2, contentsLength.Value);
                    int num3 = bytesRead2 + readOnlySpan2.Length;
                    readOnlySpan = readOnlySpan.Slice(num3);
                    bytesRead += num3;
                    num2 += readOnlySpan2.Length;
                    num = readOnlySpan2.Length;
                    if (ruleSet == AsnEncodingRules.CER && num > 1000)
                    {
                        throw new AsnContentException(System.SR.ContentException_InvalidUnderCerOrDer_TryBer);
                    }
                    if (write)
                    {
                        readOnlySpan2.CopyTo(destination2);
                        destination2 = destination2.Slice(readOnlySpan2.Length);
                    }
                    continue;
                }
                if (!(asn1Tag == Asn1Tag.EndOfContents && isIndefinite))
                {
                    if (asn1Tag == Asn1Tag.ConstructedOctetString)
                    {
                        if (ruleSet == AsnEncodingRules.CER)
                        {
                            throw new AsnContentException(System.SR.ContentException_InvalidUnderCerOrDer_TryBer);
                        }
                        if (stack == null)
                        {
                            stack = new Stack<(int, int, bool, int)>();
                        }
                        if (!source.Overlaps(readOnlySpan, out var elementOffset))
                        {
                            throw new AsnContentException();
                        }
                        stack.Push((elementOffset, readOnlySpan.Length, isIndefinite, bytesRead));
                        readOnlySpan = Slice(readOnlySpan, bytesRead2, contentsLength);
                        bytesRead = bytesRead2;
                        isIndefinite = !contentsLength.HasValue;
                        continue;
                    }
                    throw new AsnContentException();
                }
                ValidateEndOfContents(asn1Tag, contentsLength, bytesRead2);
                bytesRead += bytesRead2;
                if (stack != null && stack.Count > 0)
                {
                    (int, int, bool, int) tuple = stack.Pop();
                    int item = tuple.Item1;
                    int item2 = tuple.Item2;
                    bool item3 = tuple.Item3;
                    int item4 = tuple.Item4;
                    readOnlySpan = source.Slice(item, item2).Slice(bytesRead);
                    bytesRead += item4;
                    isIndefinite = item3;
                    continue;
                }
            }
            if (isIndefinite && asn1Tag != Asn1Tag.EndOfContents)
            {
                throw new AsnContentException();
            }
            if (stack == null || stack.Count <= 0)
            {
                break;
            }
            (int, int, bool, int) tuple2 = stack.Pop();
            int item5 = tuple2.Item1;
            int item6 = tuple2.Item2;
            bool item7 = tuple2.Item3;
            int item8 = tuple2.Item4;
            readOnlySpan = source.Slice(item5, item6).Slice(bytesRead);
            isIndefinite = item7;
            bytesRead += item8;
        }
        return num2;
    }

References System.Formats.Asn1.Asn1Tag.ConstructedBitString, System.Formats.Asn1.Asn1Tag.ConstructedOctetString, System.SR.ContentException_InvalidUnderCerOrDer_TryBer, System.Collections.Generic.Dictionary< TKey, TValue >.CopyTo(), System.destination, System.Formats.Asn1.Asn1Tag.EndOfContents, System.item, System.Formats.Asn1.Asn1Tag.PrimitiveOctetString, System.Formats.Asn1.AsnDecoder.ReadTagAndLength(), System.Formats.Asn1.AsnDecoder.Slice(), System.source, and System.Formats.Asn1.AsnDecoder.ValidateEndOfContents().