85 lines
1.4 KiB
C#
85 lines
1.4 KiB
C#
using System;
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using System.IO;
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using Org.BouncyCastle.Utilities.IO;
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namespace Org.BouncyCastle.Asn1
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{
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class DefiniteLengthInputStream
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: LimitedInputStream
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{
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private static readonly byte[] EmptyBytes = new byte[0];
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private int _length;
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internal DefiniteLengthInputStream(
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Stream inStream,
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int length)
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: base(inStream)
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{
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if (length < 0)
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throw new ArgumentException("negative lengths not allowed", "length");
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this._length = length;
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if (length == 0)
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{
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SetParentEofDetect(true);
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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 (_length == 0)
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return -1;
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int b = _in.ReadByte();
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if (b < 0)
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throw new EndOfStreamException();
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if (--_length == 0)
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{
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SetParentEofDetect(true);
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}
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return b;
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}
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public override int Read(
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byte[] buf,
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int off,
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int len)
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{
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if (_length == 0)
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return 0;
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int toRead = System.Math.Min(len, _length);
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int numRead = _in.Read(buf, off, toRead);
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if (numRead < 1)
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throw new EndOfStreamException();
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if ((_length -= numRead) == 0)
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{
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SetParentEofDetect(true);
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}
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return numRead;
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}
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internal byte[] ToArray()
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{
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if (_length == 0)
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return EmptyBytes;
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byte[] bytes = new byte[_length];
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if (Streams.ReadFully(_in, bytes) < _length)
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throw new EndOfStreamException();
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_length = 0;
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SetParentEofDetect(true);
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return bytes;
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}
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}
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}
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