opencv/3rdparty/flann/util/saving.h

/***********************************************************************
 * Software License Agreement (BSD License)
 *
 * Copyright 2008-2009  Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
 * Copyright 2008-2009  David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
 *
 * THE BSD LICENSE
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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
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 *************************************************************************/

#ifndef SAVING_H_
#define SAVING_H_

#include "constants.h"
#include "nn_index.h"


namespace cvflann
{

/**
 * Structure representing the index header.
 */
struct IndexHeader
{
	char signature[16];
	int flann_version;
	flann_algorithm_t index_type;
	int rows;
	int cols;
};

/**
 * Saves index header to stream
 *
 * @param stream - Stream to save to
 * @param index - The index to save
 */
void save_header(FILE* stream, const NNIndex& index);


/**
 *
 * @param stream - Stream to load from
 * @return Index header
 */
IndexHeader load_header(FILE* stream);


template<typename T>
void save_value(FILE* stream, const T& value, int count = 1)
{
	fwrite(&value, sizeof(value),count, stream);
}


template<typename T>
void load_value(FILE* stream, T& value, int count = 1)
{
	int read_cnt = (int)fread(&value, sizeof(value),count, stream);
	if (read_cnt!=count) {
		throw FLANNException("Cannot read from file");
	}
}
}

#endif /* SAVING_H_ */