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using System;
using System.IO;
namespace Org.BouncyCastle.Asn1
{
class IndefiniteLengthInputStream
: LimitedInputStream
{
private int _lookAhead;
private bool _eofOn00 = true;
internal IndefiniteLengthInputStream(Stream inStream, int limit)
: base(inStream, limit)
{
_lookAhead = RequireByte();
if (0 == _lookAhead)
{
CheckEndOfContents();
}
}
internal void SetEofOn00(bool eofOn00)
{
_eofOn00 = eofOn00;
if (_eofOn00 && 0 == _lookAhead)
{
CheckEndOfContents();
}
}
private void CheckEndOfContents()
{
if (0 != RequireByte())
throw new IOException("malformed end-of-contents marker");
_lookAhead = -1;
SetParentEofDetect();
}
public override int Read(byte[] buffer, int offset, int count)
{
// Only use this optimisation if we aren't checking for 00
if (_eofOn00 || count <= 1)
return base.Read(buffer, offset, count);
if (_lookAhead < 0)
return 0;
int numRead = _in.Read(buffer, offset + 1, count - 1);
if (numRead <= 0)
throw new EndOfStreamException();
buffer[offset] = (byte)_lookAhead;
_lookAhead = RequireByte();
return numRead + 1;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public override int Read(Span<byte> buffer)
{
// Only use this optimisation if we aren't checking for 00
if (_eofOn00 || buffer.Length <= 1)
return base.Read(buffer);
if (_lookAhead < 0)
return 0;
int numRead = _in.Read(buffer[1..]);
if (numRead <= 0)
throw new EndOfStreamException();
buffer[0] = (byte)_lookAhead;
_lookAhead = RequireByte();
return numRead + 1;
}
#endif
public override int ReadByte()
{
if (_eofOn00 && _lookAhead <= 0)
{
if (0 == _lookAhead)
{
CheckEndOfContents();
}
return -1;
}
int result = _lookAhead;
_lookAhead = RequireByte();
return result;
}
private int RequireByte()
{
int b = _in.ReadByte();
if (b < 0)
throw new EndOfStreamException();
return b;
}
}
}
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