//-*****************************************************************************

//

// Copyright (c) 2013,

//  Sony Pictures Imageworks Inc. and

//  Industrial Light & Magic, a division of Lucasfilm Entertainment Company Ltd.

//

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// *       Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// *       Neither the name of Industrial Light & Magic nor the names of

// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

//-*****************************************************************************

#include <Alembic/Ogawa/Foundation.h>

#include <Alembic/Ogawa/IGroup.h>

#include <Alembic/Ogawa/IData.h>

#include <Alembic/Ogawa/IStreams.h>

namespace Alembic {

namespace Ogawa {

namespace ALEMBIC_VERSION_NS {

class IData::PrivateData

{

public:

    PrivateData(IStreamsPtr iStreams)

    {

        streams = iStreams;

    };

    ~PrivateData() {};

    IStreamsPtr streams;

    // set after freeze

    Alembic::Util::uint64_t pos;

    Alembic::Util::uint64_t size;

};

IData::~IData()

{

}

IData::IData(IStreamsPtr iStreams,

             Alembic::Util::uint64_t iPos,

             std::size_t iThreadId) :

    mData(new IData::PrivateData(iStreams))

{

    mData->size = 0;

    // strip off the top bit (indicates data) to get our seek position

    mData->pos = iPos & INVALID_GROUP;

    Alembic::Util::uint64_t size = 0;

    // not the empty group?  then figure out our size

    if ( mData->pos != 0 )

    {

        mData->streams->read(iThreadId, mData->pos, 8, &size);

        if (mData->streams->getSize() < size)

        {

            throw std::runtime_error("Ogawa IData illegal size.");

        }

        else

        {

            mData->size = size;

        }

    }

}

void IData::read(Alembic::Util::uint64_t iSize, void * iData,

                 Alembic::Util::uint64_t iOffset, std::size_t iThreadId)

{

    // don't read anything if we will read beyond our buffer

    if (iSize == 0 || mData->size == 0 || iOffset + iSize > mData->size)

    {

        return;

    }

    // +8 is to account for the size

    mData->streams->read(iThreadId, mData->pos + iOffset + 8, iSize, iData);

}

Alembic::Util::uint64_t IData::getSize() const

{

    return mData->size;

}

Alembic::Util::uint64_t IData::getPos() const

{

    return mData->pos;

}

} // End namespace ALEMBIC_VERSION_NS

} // End namespace Ogawa

} // End namespace Alembic