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/***********************************************************************
* 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.
*
* 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 NNIndexGOODS 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.
*************************************************************************/
#ifndef OPENCV_FLANN_SAVING_H_
#define OPENCV_FLANN_SAVING_H_
#include <cstring>
#include <vector>
#include "general.h"
#include "nn_index.h"
#ifdef FLANN_SIGNATURE_
#undef FLANN_SIGNATURE_
#endif
#define FLANN_SIGNATURE_ "FLANN_INDEX"
namespace cvflann
{
template <typename T>
struct Datatype {};
template<>
struct Datatype<char> { static flann_datatype_t type() { return FLANN_INT8; } };
template<>
struct Datatype<short> { static flann_datatype_t type() { return FLANN_INT16; } };
template<>
struct Datatype<int> { static flann_datatype_t type() { return FLANN_INT32; } };
template<>
struct Datatype<unsigned char> { static flann_datatype_t type() { return FLANN_UINT8; } };
template<>
struct Datatype<unsigned short> { static flann_datatype_t type() { return FLANN_UINT16; } };
template<>
struct Datatype<unsigned int> { static flann_datatype_t type() { return FLANN_UINT32; } };
template<>
struct Datatype<float> { static flann_datatype_t type() { return FLANN_FLOAT32; } };
template<>
struct Datatype<double> { static flann_datatype_t type() { return FLANN_FLOAT64; } };
/**
* Structure representing the index header.
*/
struct IndexHeader
{
char signature[16];
char version[16];
flann_datatype_t data_type;
flann_algorithm_t index_type;
size_t rows;
size_t cols;
};
/**
* Saves index header to stream
*
* @param stream - Stream to save to
* @param index - The index to save
*/
template<typename Distance>
void save_header(FILE* stream, const NNIndex<Distance>& index)
{
IndexHeader header;
memset(header.signature, 0, sizeof(header.signature));
strcpy(header.signature, FLANN_SIGNATURE_);
memset(header.version, 0, sizeof(header.version));
strcpy(header.version, FLANN_VERSION_);
header.data_type = Datatype<typename Distance::ElementType>::type();
header.index_type = index.getType();
header.rows = index.size();
header.cols = index.veclen();
std::fwrite(&header, sizeof(header),1,stream);
}
/**
*
* @param stream - Stream to load from
* @return Index header
*/
inline IndexHeader load_header(FILE* stream)
{
IndexHeader header;
size_t read_size = fread(&header,sizeof(header),1,stream);
if (read_size!=(size_t)1) {
throw FLANNException("Invalid index file, cannot read");
}
if (strcmp(header.signature,FLANN_SIGNATURE_)!=0) {
throw FLANNException("Invalid index file, wrong signature");
}
return header;
}
template<typename T>
void save_value(FILE* stream, const T& value, size_t count = 1)
{
fwrite(&value, sizeof(value),count, stream);
}
template<typename T>
void save_value(FILE* stream, const cvflann::Matrix<T>& value)
{
fwrite(&value, sizeof(value),1, stream);
fwrite(value.data, sizeof(T),value.rows*value.cols, stream);
}
template<typename T>
void save_value(FILE* stream, const std::vector<T>& value)
{
size_t size = value.size();
fwrite(&size, sizeof(size_t), 1, stream);
fwrite(&value[0], sizeof(T), size, stream);
}
template<typename T>
void load_value(FILE* stream, T& value, size_t count = 1)
{
size_t read_cnt = fread(&value, sizeof(value), count, stream);
if (read_cnt != count) {
throw FLANNException("Cannot read from file");
}
}
template<typename T>
void load_value(FILE* stream, cvflann::Matrix<T>& value)
{
size_t read_cnt = fread(&value, sizeof(value), 1, stream);
if (read_cnt != 1) {
throw FLANNException("Cannot read from file");
}
value.data = new T[value.rows*value.cols];
read_cnt = fread(value.data, sizeof(T), value.rows*value.cols, stream);
if (read_cnt != (size_t)(value.rows*value.cols)) {
throw FLANNException("Cannot read from file");
}
}
template<typename T>
void load_value(FILE* stream, std::vector<T>& value)
{
size_t size;
size_t read_cnt = fread(&size, sizeof(size_t), 1, stream);
if (read_cnt!=1) {
throw FLANNException("Cannot read from file");
}
value.resize(size);
read_cnt = fread(&value[0], sizeof(T), size, stream);
if (read_cnt != size) {
throw FLANNException("Cannot read from file");
}
}
}
#endif /* OPENCV_FLANN_SAVING_H_ */
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