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123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
//
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// DigestStream.h
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//
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// $Id: //poco/Main/Foundation/include/Poco/DigestStream.h#2 $
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//
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// Library: Foundation
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// Package: Crypt
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// Module: DigestStream
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//
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// Definition of classes DigestInputStream and DigestOutputStream.
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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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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_DigestStream_INCLUDED
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#define Foundation_DigestStream_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/BufferedStreamBuf.h"
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#include "Poco/DigestEngine.h"
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#include <istream>
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#include <ostream>
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namespace Poco {
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class Foundation_API DigestBuf: public BufferedStreamBuf
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/// This streambuf computes a digest of all data going
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/// through it.
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{
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public:
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DigestBuf(DigestEngine& eng);
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DigestBuf(DigestEngine& eng, std::istream& istr);
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DigestBuf(DigestEngine& eng, std::ostream& ostr);
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~DigestBuf();
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int readFromDevice(char* buffer, std::streamsize length);
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int writeToDevice(const char* buffer, std::streamsize length);
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void close();
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private:
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DigestEngine& _eng;
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std::istream* _pIstr;
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std::ostream* _pOstr;
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static const int BUFFER_SIZE;
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};
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class Foundation_API DigestIOS: public virtual std::ios
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/// The base class for DigestInputStream and DigestOutputStream.
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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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DigestIOS(DigestEngine& eng);
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DigestIOS(DigestEngine& eng, std::istream& istr);
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DigestIOS(DigestEngine& eng, std::ostream& ostr);
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~DigestIOS();
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DigestBuf* rdbuf();
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protected:
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DigestBuf _buf;
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};
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class Foundation_API DigestInputStream: public DigestIOS, public std::istream
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/// This istream computes a digest of
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/// all the data passing through it,
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/// using a DigestEngine.
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{
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public:
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DigestInputStream(DigestEngine& eng, std::istream& istr);
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~DigestInputStream();
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};
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class Foundation_API DigestOutputStream: public DigestIOS, public std::ostream
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/// This ostream computes a digest of
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/// all the data passing through it,
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/// using a DigestEngine.
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/// To ensure that all data has been incorporated
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/// into the digest, call close() or flush() before
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/// you obtain the digest from the digest engine.
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{
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public:
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DigestOutputStream(DigestEngine& eng);
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DigestOutputStream(DigestEngine& eng, std::ostream& ostr);
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~DigestOutputStream();
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void close();
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};
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} // namespace Poco
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#endif // Foundation_DigestStream_INCLUDED
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