using System.IO; namespace Org.BouncyCastle.Utilities.IO { internal sealed class LimitedInputStream : BaseInputStream { private readonly Stream m_stream; private long m_limit; internal long CurrentLimit => m_limit; internal LimitedInputStream(Stream stream, long limit) { m_stream = stream; m_limit = limit; } public override int Read(byte[] buffer, int offset, int count) { int num = m_stream.Read(buffer, offset, count); if (num > 0 && (m_limit -= num) < 0) throw new StreamOverflowException("Data Overflow"); return num; } public override int ReadByte() { int num = m_stream.ReadByte(); if (num >= 0 && --m_limit < 0) throw new StreamOverflowException("Data Overflow"); return num; } } }