88 lines
1.7 KiB
C#
88 lines
1.7 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.IO;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.IO
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{
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public class PushbackStream
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: FilterStream
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{
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private int m_buf = -1;
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public PushbackStream(Stream s)
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: base(s)
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{
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}
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#if NETCOREAPP2_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER || (UNITY_2021_2_OR_NEWER && (NET_STANDARD_2_0 || NET_STANDARD_2_1))
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public override void CopyTo(Stream destination, int bufferSize)
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{
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if (m_buf != -1)
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{
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destination.WriteByte((byte)m_buf);
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m_buf = -1;
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}
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s.CopyTo(destination, bufferSize);
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}
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#endif
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public override int Read(byte[] buffer, int offset, int count)
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{
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Streams.ValidateBufferArguments(buffer, offset, count);
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if (m_buf != -1)
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{
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if (count < 1)
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return 0;
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buffer[offset] = (byte)m_buf;
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m_buf = -1;
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return 1;
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}
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return s.Read(buffer, offset, count);
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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public override int Read(Span<byte> buffer)
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{
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if (m_buf != -1)
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{
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if (buffer.IsEmpty)
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return 0;
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buffer[0] = (byte)m_buf;
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m_buf = -1;
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return 1;
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}
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return s.Read(buffer);
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}
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#endif
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public override int ReadByte()
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{
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if (m_buf != -1)
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{
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int tmp = m_buf;
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m_buf = -1;
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return tmp;
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}
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return base.ReadByte();
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}
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public virtual void Unread(int b)
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{
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if (m_buf != -1)
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throw new InvalidOperationException("Can only push back one byte");
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m_buf = b & 0xFF;
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}
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}
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}
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#pragma warning restore
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#endif
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