83 lines
1.4 KiB
C#
83 lines
1.4 KiB
C#
using System.IO;
|
|
|
|
namespace Org.BouncyCastle.Asn1;
|
|
|
|
internal 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 == 0)
|
|
{
|
|
if (RequireByte() != 0)
|
|
{
|
|
throw new IOException("malformed end-of-contents marker");
|
|
}
|
|
_lookAhead = -1;
|
|
SetParentEofDetect(on: true);
|
|
return true;
|
|
}
|
|
return _lookAhead < 0;
|
|
}
|
|
|
|
public override int Read(byte[] buffer, int offset, int count)
|
|
{
|
|
if (_eofOn00 || count <= 1)
|
|
{
|
|
return base.Read(buffer, offset, count);
|
|
}
|
|
if (_lookAhead < 0)
|
|
{
|
|
return 0;
|
|
}
|
|
int num = _in.Read(buffer, offset + 1, count - 1);
|
|
if (num <= 0)
|
|
{
|
|
throw new EndOfStreamException();
|
|
}
|
|
buffer[offset] = (byte)_lookAhead;
|
|
_lookAhead = RequireByte();
|
|
return num + 1;
|
|
}
|
|
|
|
public override int ReadByte()
|
|
{
|
|
if (_eofOn00 && CheckForEof())
|
|
{
|
|
return -1;
|
|
}
|
|
int lookAhead = _lookAhead;
|
|
_lookAhead = RequireByte();
|
|
return lookAhead;
|
|
}
|
|
|
|
private int RequireByte()
|
|
{
|
|
int num = _in.ReadByte();
|
|
if (num < 0)
|
|
{
|
|
throw new EndOfStreamException();
|
|
}
|
|
return num;
|
|
}
|
|
}
|