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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();
CheckForEof();
}
internal void SetEofOn00(
bool eofOn00)
{
_eofOn00 = eofOn00;
if (_eofOn00)
{
CheckForEof();
}
}
private bool CheckForEof()
{
if (_lookAhead == 0x00)
{
int extra = RequireByte();
if (extra != 0)
{
throw new IOException("malformed end-of-contents marker");
}
_lookAhead = -1;
SetParentEofDetect(true);
return true;
}
return _lookAhead < 0;
}
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)
{
// Corrupted stream
throw new EndOfStreamException();
}
buffer[offset] = (byte)_lookAhead;
_lookAhead = RequireByte();
return numRead + 1;
}
public override int ReadByte()
{
if (_eofOn00 && CheckForEof())
return -1;
int result = _lookAhead;
_lookAhead = RequireByte();
return result;
}
private int RequireByte()
{
int b = _in.ReadByte();
if (b < 0)
{
// Corrupted stream
throw new EndOfStreamException();
}
return b;
}
}
}
//using System;
//using System.IO;
//namespace Org.BouncyCastle.Asn1
//{
// class IndefiniteLengthInputStream
// : LimitedInputStream
// {
// private bool _eofReached = false;
// private bool _eofOn00 = true;
// internal IndefiniteLengthInputStream(
// Stream inStream,
// int limit)
// : base(inStream, limit)
// {
// }
// internal void SetEofOn00(
// bool eofOn00)
// {
// _eofOn00 = eofOn00;
// }
// public override int Read(
// byte[] buffer,
// int offset,
// int count)
// {
// if (_eofReached)
// return 0;
// if (_eofOn00)
// return base.Read(buffer, offset, count);
// int numRead = _in.Read(buffer, offset, count);
// if (numRead <= 0)
// throw new EndOfStreamException();
// return numRead;
// }
// public override int ReadByte()
// {
// if (_eofReached)
// return -1;
// int b1 = _in.ReadByte();
// if (b1 < 0)
// throw new EndOfStreamException();
// if (b1 == 0 && _eofOn00)
// {
// int b2 = _in.ReadByte();
// if (b2 < 0)
// throw new EndOfStreamException();
// if (b2 == 0)
// {
// _eofReached = true;
// SetParentEofDetect(true);
// return -1;
// }
// throw new InvalidDataException();
// }
// return b1;
// }
// }
//}
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