48 lines
1.6 KiB
C#
48 lines
1.6 KiB
C#
using System;
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using System.Diagnostics;
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using System.IO;
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namespace Org.BouncyCastle.Utilities.IO
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{
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public abstract class BaseInputStream : Stream
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{
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private bool closed;
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public sealed override bool CanRead { get { return !closed; } }
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public sealed override bool CanSeek { get { return false; } }
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public sealed override bool CanWrite { get { return false; } }
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public override void Close() { closed = true; }
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public sealed override void Flush() {}
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public sealed override long Length { get { throw new NotSupportedException(); } }
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public sealed override long Position
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{
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get { throw new NotSupportedException(); }
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set { throw new NotSupportedException(); }
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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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int pos = offset;
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try
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{
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int end = offset + count;
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while (pos < end)
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{
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int b = ReadByte();
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if (b == -1) break;
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buffer[pos++] = (byte) b;
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}
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}
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catch (IOException)
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{
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if (pos == offset) throw;
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}
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return pos - offset;
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}
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public sealed override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); }
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public sealed override void SetLength(long value) { throw new NotSupportedException(); }
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public sealed override void Write(byte[] buffer, int offset, int count) { throw new NotSupportedException(); }
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}
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}
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