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76 lines
1.5 KiB
C++
76 lines
1.5 KiB
C++
//
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// RandomStream.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/RandomStream.h#1 $
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//
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// Library: Foundation
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// Package: Crypt
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// Module: RandomStream
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//
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// Definition of class RandomInputStream.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_RandomStream_INCLUDED
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#define Foundation_RandomStream_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/BufferedStreamBuf.h"
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#include <istream>
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namespace Poco {
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class Foundation_API RandomBuf: public BufferedStreamBuf
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/// This streambuf generates random data.
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/// On Windows NT, the cryptographic API is used.
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/// On Unix, /dev/random is used, if available.
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/// Otherwise, a random number generator, some
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/// more-or-less random data and a SHA-1 digest
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/// is used to generate random data.
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{
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public:
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RandomBuf();
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~RandomBuf();
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int readFromDevice(char* buffer, std::streamsize length);
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};
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class Foundation_API RandomIOS: public virtual std::ios
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/// The base class for RandomInputStream.
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///
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/// This class is needed to ensure the correct initialization
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/// order of the stream buffer and base classes.
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{
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public:
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RandomIOS();
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~RandomIOS();
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RandomBuf* rdbuf();
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protected:
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RandomBuf _buf;
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};
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class Foundation_API RandomInputStream: public RandomIOS, public std::istream
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/// This istream generates random data
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/// using the RandomBuf.
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{
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public:
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RandomInputStream();
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~RandomInputStream();
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};
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} // namespace Poco
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#endif // Foundation_RandomStream_INCLUDED
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