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// DigestStream.h
//
// Library: Foundation
// Package: Crypt
// Module: DigestStream
//
// Definition of classes DigestInputStream and DigestOutputStream.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_DigestStream_INCLUDED
#define Foundation_DigestStream_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/BufferedStreamBuf.h"
#include "Poco/DigestEngine.h"
#include <istream>
#include <ostream>
namespace Poco {
class Foundation_API DigestBuf: public BufferedStreamBuf
/// This streambuf computes a digest of all data going
/// through it.
{
public:
DigestBuf(DigestEngine& eng);
DigestBuf(DigestEngine& eng, std::istream& istr);
DigestBuf(DigestEngine& eng, std::ostream& ostr);
~DigestBuf();
int readFromDevice(char* buffer, std::streamsize length);
int writeToDevice(const char* buffer, std::streamsize length);
void close();
private:
DigestEngine& _eng;
std::istream* _pIstr;
std::ostream* _pOstr;
static const int BUFFER_SIZE;
};
class Foundation_API DigestIOS: public virtual std::ios
/// The base class for DigestInputStream and DigestOutputStream.
///
/// This class is needed to ensure the correct initialization
/// order of the stream buffer and base classes.
{
public:
DigestIOS(DigestEngine& eng);
DigestIOS(DigestEngine& eng, std::istream& istr);
DigestIOS(DigestEngine& eng, std::ostream& ostr);
~DigestIOS();
DigestBuf* rdbuf();
protected:
DigestBuf _buf;
};
class Foundation_API DigestInputStream: public DigestIOS, public std::istream
/// This istream computes a digest of
/// all the data passing through it,
/// using a DigestEngine.
{
public:
DigestInputStream(DigestEngine& eng, std::istream& istr);
~DigestInputStream();
};
class Foundation_API DigestOutputStream: public DigestIOS, public std::ostream
/// This ostream computes a digest of
/// all the data passing through it,
/// using a DigestEngine.
/// To ensure that all data has been incorporated
/// into the digest, call close() or flush() before
/// you obtain the digest from the digest engine.
{
public:
DigestOutputStream(DigestEngine& eng);
DigestOutputStream(DigestEngine& eng, std::ostream& ostr);
~DigestOutputStream();
void close();
};
} // namespace Poco
#endif // Foundation_DigestStream_INCLUDED
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