///////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas

// Digital Ltd. LLC

// 

// 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.67

//

///////////////////////////////////////////////////////////////////////////

//-----------------------------------------------------------------------------

//

//	Low-level file input and output for OpenEXR

//	based on C++ standard iostreams.

//

//-----------------------------------------------------------------------------

#include <ImfStdIO.h>

#include "Iex.h"

#include <errno.h>

using namespace std;

#include "ImfNamespace.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER

namespace {

void

clearError ()

{

    errno = 0;

}

bool

checkError (istream &is, streamsize expected = 0)

{

    if (!is)

    {

	if (errno)

	    IEX_NAMESPACE::throwErrnoExc();

	if (is.gcount() < expected) 

	{

		THROW (IEX_NAMESPACE::InputExc, "Early end of file: read " << is.gcount() 

			<< " out of " << expected << " requested bytes.");

	}

	return false;

    }

    return true;

}

void

checkError (ostream &os)

{

    if (!os)

    {

	if (errno)

	    IEX_NAMESPACE::throwErrnoExc();

	throw IEX_NAMESPACE::ErrnoExc ("File output failed.");

    }

}

} // namespace

StdIFStream::StdIFStream (const char fileName[]):

    OPENEXR_IMF_INTERNAL_NAMESPACE::IStream (fileName),

    _is (new ifstream (fileName, ios_base::binary)),

    _deleteStream (true)

{

    if (!*_is)

    {

	delete _is;

	IEX_NAMESPACE::throwErrnoExc();

    }

}

StdIFStream::StdIFStream (ifstream &is, const char fileName[]):

    OPENEXR_IMF_INTERNAL_NAMESPACE::IStream (fileName),

    _is (&is),

    _deleteStream (false)

{

    // empty

}

StdIFStream::~StdIFStream ()

{

    if (_deleteStream)

	delete _is;

}

bool

StdIFStream::read (char c[/*n*/], int n)

{

    if (!*_is)

        throw IEX_NAMESPACE::InputExc ("Unexpected end of file.");

    clearError();

    _is->read (c, n);

    return checkError (*_is, n);

}

Int64

StdIFStream::tellg ()

{

    return std::streamoff (_is->tellg());

}

void

StdIFStream::seekg (Int64 pos)

{

    _is->seekg (pos);

    checkError (*_is);

}

void

StdIFStream::clear ()

{

    _is->clear();

}

StdOFStream::StdOFStream (const char fileName[]):

    OPENEXR_IMF_INTERNAL_NAMESPACE::OStream (fileName),

    _os (new ofstream (fileName, ios_base::binary)),

    _deleteStream (true)

{

    if (!*_os)

    {

	delete _os;

	IEX_NAMESPACE::throwErrnoExc();

    }

}

StdOFStream::StdOFStream (ofstream &os, const char fileName[]):

    OPENEXR_IMF_INTERNAL_NAMESPACE::OStream (fileName),

    _os (&os),

    _deleteStream (false)

{

    // empty

}

StdOFStream::~StdOFStream ()

{

    if (_deleteStream)

	delete _os;

}

void

StdOFStream::write (const char c[/*n*/], int n)

{

    clearError();

    _os->write (c, n);

    checkError (*_os);

}

Int64

StdOFStream::tellp ()

{

    return std::streamoff (_os->tellp());

}

void

StdOFStream::seekp (Int64 pos)

{

    _os->seekp (pos);

    checkError (*_os);

}

StdOSStream::StdOSStream (): OPENEXR_IMF_INTERNAL_NAMESPACE::OStream ("(string)")

{

    // empty

}

void

StdOSStream::write (const char c[/*n*/], int n)

{

    clearError();

    _os.write (c, n);

    checkError (_os);

}

Int64

StdOSStream::tellp ()

{

    return std::streamoff (_os.tellp());

}

void

StdOSStream::seekp (Int64 pos)

{

    _os.seekp (pos);

    checkError (_os);

}

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT