HashStream.h

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/*
 * Copyright (C) 2012 by
 *   MetraLabs GmbH (MLAB), GERMANY
 * and
 *   Neuroinformatics and Cognitive Robotics Labs (NICR) at TU Ilmenau, GERMANY
 * All rights reserved.
 *
 * Contact: info@mira-project.org
 *
 * Commercial Usage:
 *   Licensees holding valid commercial licenses may use this file in
 *   accordance with the commercial license agreement provided with the
 *   software or, alternatively, in accordance with the terms contained in
 *   a written agreement between you and MLAB or NICR.
 *
 * GNU General Public License Usage:
 *   Alternatively, this file may be used under the terms of the GNU
 *   General Public License version 3.0 as published by the Free Software
 *   Foundation and appearing in the file LICENSE.GPL3 included in the
 *   packaging of this file. Please review the following information to
 *   ensure the GNU General Public License version 3.0 requirements will be
 *   met: http://www.gnu.org/copyleft/gpl.html.
 *   Alternatively you may (at your option) use any later version of the GNU
 *   General Public License if such license has been publicly approved by
 *   MLAB and NICR (or its successors, if any).
 *
 * IN NO EVENT SHALL "MLAB" OR "NICR" BE LIABLE TO ANY PARTY FOR DIRECT,
 * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
 * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF "MLAB" OR
 * "NICR" HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * "MLAB" AND "NICR" SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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 */

#ifndef _MIRA_HASH_STREAM_H_
#define _MIRA_HASH_STREAM_H_

#include <ostream>
#include <string>
#include <vector>

#include <platform/Types.h>

namespace mira {


class MIRA_BASE_EXPORT HashDigest :
    public std::vector<uint8>
{
public:
    HashDigest(size_t iLength = 0) :
        std::vector<uint8>(iLength) {}

    std::string toString() const;
};


class HashStreamBuf :
    public std::basic_streambuf<char, std::char_traits<char> >
{
public:
    virtual void reset() = 0;

    virtual HashDigest getDigest() const = 0;
};


template<class T>
class HashStream :
    public std::ostream
{
public:
    HashStream() : std::ostream(&mBuffer) {}

    virtual ~HashStream() {}

    virtual void reset() { mBuffer.reset(); }

    HashDigest getDigest() const { return(mBuffer.getDigest()); }

public:
    HashStream& operator<<(const char* value) {
        write(value, strlen(value));
        return *this;
    }

    HashStream& operator<<(const std::string& value) {
        write(value.c_str(), value.size());
        return *this;
    }

    HashStream& operator<<(const bool& value) {
        write((char*)&value, sizeof(bool));
        return *this;
    }

    HashStream& operator<<(const char& value) {
        write(&value, sizeof(char));
        return *this;
    }

    HashStream& operator<<(const uint8& value) {
        write((char*)&value, sizeof(uint8));
        return *this;
    }

    HashStream& operator<<(const uint16& value) {
        write((char*)&value, sizeof(uint16));
        return *this;
    }

    HashStream& operator<<(const uint32& value) {
        write((char*)&value, sizeof(uint32));
        return *this;
    }

    HashStream& operator<<(const uint64& value) {
        write((char*)&value, sizeof(uint64));
        return *this;
    }

    HashStream& operator<<(const int8& value) {
        write((char*)&value, sizeof(int8));
        return *this;
    }

    HashStream& operator<<(const int16& value) {
        write((char*)&value, sizeof(int16));
        return *this;
    }

    HashStream& operator<<(const int32& value) {
        write((char*)&value, sizeof(int32));
        return *this;
    }

    HashStream& operator<<(const int64& value) {
        write((char*)&value, sizeof(int64));
        return *this;
    }

    HashStream& operator<<(const float& value) {
        write((char*)&value, sizeof(float));
        return *this;
    }

    HashStream& operator<<(const double& value) {
        write((char*)&value, sizeof(double));
        return *this;
    }

private:
    T mBuffer;
};


} // namespace

#endif