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using System;
using System.IO;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Asn1
{
internal class DefiniteLengthInputStream
: LimitedInputStream
{
private static readonly byte[] EmptyBytes = new byte[0];
private readonly int _originalLength;
private int _remaining;
internal DefiniteLengthInputStream(Stream inStream, int length, int limit)
: base(inStream, limit)
{
if (length <= 0)
{
if (length < 0)
throw new ArgumentException("negative lengths not allowed", "length");
SetParentEofDetect();
}
this._originalLength = length;
this._remaining = length;
}
internal int Remaining
{
get { return _remaining; }
}
public override int ReadByte()
{
if (_remaining < 2)
{
if (_remaining == 0)
return -1;
int b = _in.ReadByte();
if (b < 0)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
_remaining = 0;
SetParentEofDetect();
return b;
}
else
{
int b = _in.ReadByte();
if (b < 0)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
--_remaining;
return b;
}
}
public override int Read(byte[] buf, int off, int len)
{
if (_remaining == 0)
return 0;
int toRead = System.Math.Min(len, _remaining);
int numRead = _in.Read(buf, off, toRead);
if (numRead < 1)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
if ((_remaining -= numRead) == 0)
{
SetParentEofDetect();
}
return numRead;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public override int Read(Span<byte> buffer)
{
if (_remaining == 0)
return 0;
int toRead = System.Math.Min(buffer.Length, _remaining);
int numRead = _in.Read(buffer[..toRead]);
if (numRead < 1)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
if ((_remaining -= numRead) == 0)
{
SetParentEofDetect();
}
return numRead;
}
#endif
internal void ReadAllIntoByteArray(byte[] buf)
{
if (_remaining != buf.Length)
throw new ArgumentException("buffer length not right for data");
if (_remaining == 0)
return;
// make sure it's safe to do this!
int limit = Limit;
if (_remaining >= limit)
throw new IOException("corrupted stream - out of bounds length found: " + _remaining + " >= " + limit);
if ((_remaining -= Streams.ReadFully(_in, buf, 0, buf.Length)) != 0)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
SetParentEofDetect();
}
internal byte[] ToArray()
{
if (_remaining == 0)
return EmptyBytes;
// make sure it's safe to do this!
int limit = Limit;
if (_remaining >= limit)
throw new IOException("corrupted stream - out of bounds length found: " + _remaining + " >= " + limit);
byte[] bytes = new byte[_remaining];
if ((_remaining -= Streams.ReadFully(_in, bytes, 0, bytes.Length)) != 0)
throw new EndOfStreamException("DEF length " + _originalLength + " object truncated by " + _remaining);
SetParentEofDetect();
return bytes;
}
}
}
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