using Org.BouncyCastle.Utilities; using Org.BouncyCastle.Utilities.IO; using System; using System.IO; namespace Org.BouncyCastle.Asn1 { internal class ConstructedOctetStream : BaseInputStream { private readonly Asn1StreamParser m_parser; private bool m_first = true; private Stream m_currentStream; internal ConstructedOctetStream(Asn1StreamParser parser) { m_parser = parser; } public override int Read(byte[] buffer, int offset, int count) { Streams.ValidateBufferArguments(buffer, offset, count); return Read(buffer.AsSpan(offset, count)); } public override int Read(Span<byte> buffer) { if (buffer.IsEmpty) return 0; if (m_currentStream == null) { if (!m_first) return 0; Asn1OctetStringParser nextParser = GetNextParser(); if (nextParser == null) return 0; m_first = false; m_currentStream = nextParser.GetOctetStream(); } int num = 0; while (true) { Stream currentStream = m_currentStream; int num2 = num; int num3 = currentStream.Read(buffer.Slice(num2, buffer.Length - num2)); if (num3 > 0) { num += num3; if (num == buffer.Length) return num; } else { Asn1OctetStringParser nextParser2 = GetNextParser(); if (nextParser2 == null) break; m_currentStream = nextParser2.GetOctetStream(); } } m_currentStream = null; return num; } public override int ReadByte() { if (m_currentStream == null) { if (!m_first) return -1; Asn1OctetStringParser nextParser = GetNextParser(); if (nextParser == null) return -1; m_first = false; m_currentStream = nextParser.GetOctetStream(); } while (true) { int num = m_currentStream.ReadByte(); if (num >= 0) return num; Asn1OctetStringParser nextParser2 = GetNextParser(); if (nextParser2 == null) break; m_currentStream = nextParser2.GetOctetStream(); } m_currentStream = null; return -1; } private Asn1OctetStringParser GetNextParser() { IAsn1Convertible asn1Convertible = m_parser.ReadObject(); if (asn1Convertible == null) return null; if (asn1Convertible is Asn1OctetStringParser) return (Asn1OctetStringParser)asn1Convertible; throw new IOException("unknown object encountered: " + Platform.GetTypeName(asn1Convertible)); } } }