46 lines
703 B
C#
46 lines
703 B
C#
using System;
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using System.IO;
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namespace Org.BouncyCastle.Utilities.IO;
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public class PushbackStream : FilterStream
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{
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private int 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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public override int ReadByte()
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{
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if (buf != -1)
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{
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int result = buf;
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buf = -1;
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return result;
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}
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return base.ReadByte();
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}
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public override int Read(byte[] buffer, int offset, int count)
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{
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if (buf != -1 && count > 0)
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{
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buffer[offset] = (byte)buf;
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buf = -1;
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return 1;
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}
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return base.Read(buffer, offset, count);
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}
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public virtual void Unread(int b)
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{
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if (buf != -1)
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{
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throw new InvalidOperationException("Can only push back one byte");
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}
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buf = b & 0xFF;
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}
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}
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