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/* Copyright (c) 2008-2022 the MRtrix3 contributors.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Covered Software is provided under this License on an "as is"
* basis, without warranty of any kind, either expressed, implied, or
* statutory, including, without limitation, warranties that the
* Covered Software is free of defects, merchantable, fit for a
* particular purpose or non-infringing.
* See the Mozilla Public License v. 2.0 for more details.
*
* For more details, see http://www.mrtrix.org/.
*/
#include "file/utils.h"
#include "file/path.h"
#include "file/gz.h"
#include "file/mgh.h"
#include "header.h"
#include "raw.h"
#include "image_io/gz.h"
#include "formats/list.h"
namespace MR
{
namespace Formats
{
std::unique_ptr<ImageIO::Base> MGZ::read (Header& H) const
{
if (!Path::has_suffix (H.name(), ".mgh.gz") && !Path::has_suffix (H.name(), ".mgz"))
return std::unique_ptr<ImageIO::Base>();
std::string mgh_header (MGH_DATA_OFFSET, '\0');
File::GZ in (H.name(), "rb");
in.read (reinterpret_cast<char*> (&mgh_header[0]), MGH_DATA_OFFSET);
std::istringstream s (mgh_header);
File::MGH::read_header (H, s);
// Remaining header items appear AFTER the data
// It's possible that these data may not even be there; need to make sure that we don't go over the file size
in.seek (MGH_DATA_OFFSET + footprint (H));
File::MGH::read_other (H, in);
in.close();
// need to fill in GZ handler's header and tailer entries in case image
// is opened read/write:
std::ostringstream mgh_tailer;
File::MGH::write_other (H, mgh_tailer);
auto gz_handler = new ImageIO::GZ (H, MGH_DATA_OFFSET, mgh_tailer.str().size());
memcpy (gz_handler->header(), mgh_header.c_str(), mgh_header.size());
memcpy (gz_handler->tailer(), mgh_tailer.str().c_str(), mgh_tailer.str().size());
std::unique_ptr<ImageIO::Base> io_handler (gz_handler);
io_handler->files.push_back (File::Entry (H.name(), MGH_DATA_OFFSET));
return io_handler;
}
bool MGZ::check (Header& H, size_t num_axes) const
{
if (!Path::has_suffix (H.name(), ".mgh.gz") && !Path::has_suffix (H.name(), ".mgz")) return false;
return File::MGH::check (H, num_axes);
}
std::unique_ptr<ImageIO::Base> MGZ::create (Header& H) const
{
std::ostringstream mgh_header, mgh_tailer;
File::MGH::write_header (H, mgh_header);
File::MGH::write_other (H, mgh_tailer);
File::create (H.name());
auto gz_handler = new ImageIO::GZ (H, MGH_DATA_OFFSET, mgh_tailer.str().size());
memset (gz_handler->header(), 0, MGH_DATA_OFFSET);
memcpy (gz_handler->header(), mgh_header.str().c_str(), mgh_header.str().size());
memcpy (gz_handler->tailer(), mgh_tailer.str().c_str(), mgh_tailer.str().size());
std::unique_ptr<ImageIO::Base> io_handler (gz_handler);
io_handler->files.push_back (File::Entry (H.name(), MGH_DATA_OFFSET));
return io_handler;
}
}
}
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