kopia lustrzana https://github.com/dl2alf/AirScout
135 wiersze
3.6 KiB
C#
135 wiersze
3.6 KiB
C#
using System;
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using System.IO;
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using Org.BouncyCastle.Utilities;
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using Org.BouncyCastle.Utilities.IO;
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namespace Org.BouncyCastle.Asn1
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{
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internal class ConstructedBitStream
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: BaseInputStream
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{
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private readonly Asn1StreamParser m_parser;
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private readonly bool m_octetAligned;
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private bool m_first = true;
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private int m_padBits = 0;
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private Asn1BitStringParser m_currentParser;
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private Stream m_currentStream;
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internal ConstructedBitStream(Asn1StreamParser parser, bool octetAligned)
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{
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m_parser = parser;
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m_octetAligned = octetAligned;
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}
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internal int PadBits
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{
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get { return m_padBits; }
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}
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public override int Read(byte[] buf, int off, int len)
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{
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if (len < 1)
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return 0;
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if (m_currentStream == null)
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{
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if (!m_first)
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return 0;
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m_currentParser = GetNextParser();
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if (m_currentParser == null)
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return 0;
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m_first = false;
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m_currentStream = m_currentParser.GetBitStream();
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}
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int totalRead = 0;
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for (;;)
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{
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int numRead = m_currentStream.Read(buf, off + totalRead, len - totalRead);
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if (numRead > 0)
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{
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totalRead += numRead;
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if (totalRead == len)
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return totalRead;
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}
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else
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{
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m_padBits = m_currentParser.PadBits;
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m_currentParser = GetNextParser();
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if (m_currentParser == null)
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{
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m_currentStream = null;
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return totalRead;
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}
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m_currentStream = m_currentParser.GetBitStream();
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}
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}
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}
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public override int ReadByte()
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{
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if (m_currentStream == null)
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{
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if (!m_first)
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return -1;
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m_currentParser = GetNextParser();
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if (m_currentParser == null)
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return -1;
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m_first = false;
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m_currentStream = m_currentParser.GetBitStream();
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}
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for (;;)
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{
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int b = m_currentStream.ReadByte();
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if (b >= 0)
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return b;
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m_padBits = m_currentParser.PadBits;
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m_currentParser = GetNextParser();
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if (m_currentParser == null)
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{
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m_currentStream = null;
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return -1;
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}
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m_currentStream = m_currentParser.GetBitStream();
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}
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}
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private Asn1BitStringParser GetNextParser()
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{
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IAsn1Convertible asn1Obj = m_parser.ReadObject();
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if (asn1Obj == null)
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{
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if (m_octetAligned && m_padBits != 0)
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throw new IOException("expected octet-aligned bitstring, but found padBits: " + m_padBits);
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return null;
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}
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if (asn1Obj is Asn1BitStringParser)
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{
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if (m_padBits != 0)
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throw new IOException("only the last nested bitstring can have padding");
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return (Asn1BitStringParser)asn1Obj;
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}
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throw new IOException("unknown object encountered: " + Platform.GetTypeName(asn1Obj));
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}
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}
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}
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