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116 lines
4.0 KiB
C++
116 lines
4.0 KiB
C++
/***********************************************************************
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* Software License Agreement (BSD License)
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*
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* Copyright 2008-2009 Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
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* Copyright 2008-2009 David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE NNIndexGOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*************************************************************************/
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#ifndef _OPENCV_SAVING_H_
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#define _OPENCV_SAVING_H_
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#include "opencv2/flann/general.h"
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#include "opencv2/flann/nn_index.h"
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#include <cstdio>
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#include <cstring>
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namespace cvflann
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{
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template <typename T> struct Datatype {};
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template<> struct Datatype<char> { static flann_datatype_t type() { return FLANN_INT8; } };
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template<> struct Datatype<short> { static flann_datatype_t type() { return FLANN_INT16; } };
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template<> struct Datatype<int> { static flann_datatype_t type() { return FLANN_INT32; } };
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template<> struct Datatype<unsigned char> { static flann_datatype_t type() { return FLANN_UINT8; } };
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template<> struct Datatype<unsigned short> { static flann_datatype_t type() { return FLANN_UINT16; } };
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template<> struct Datatype<unsigned int> { static flann_datatype_t type() { return FLANN_UINT32; } };
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template<> struct Datatype<float> { static flann_datatype_t type() { return FLANN_FLOAT32; } };
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template<> struct Datatype<double> { static flann_datatype_t type() { return FLANN_FLOAT64; } };
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CV_EXPORTS const char* FLANN_SIGNATURE();
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CV_EXPORTS const char* FLANN_VERSION();
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/**
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* Structure representing the index header.
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*/
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struct CV_EXPORTS IndexHeader
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{
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char signature[16];
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char version[16];
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flann_datatype_t data_type;
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flann_algorithm_t index_type;
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int rows;
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int cols;
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};
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/**
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* Saves index header to stream
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*
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* @param stream - Stream to save to
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* @param index - The index to save
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*/
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template<typename ELEM_TYPE>
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void save_header(FILE* stream, const NNIndex<ELEM_TYPE>& index)
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{
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IndexHeader header;
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memset(header.signature, 0 , sizeof(header.signature));
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strcpy(header.signature, FLANN_SIGNATURE());
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memset(header.version, 0 , sizeof(header.version));
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strcpy(header.version, FLANN_VERSION());
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header.data_type = Datatype<ELEM_TYPE>::type();
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header.index_type = index.getType();
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header.rows = (int)index.size();
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header.cols = index.veclen();
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std::fwrite(&header, sizeof(header),1,stream);
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}
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/**
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*
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* @param stream - Stream to load from
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* @return Index header
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*/
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CV_EXPORTS IndexHeader load_header(FILE* stream);
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template<typename T>
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void save_value(FILE* stream, const T& value, int count = 1)
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{
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fwrite(&value, 1, sizeof(value)*count, stream);
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}
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template<typename T>
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void load_value(FILE* stream, T& value, int count = 1)
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{
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int read_cnt = (int)fread(&value, sizeof(value),count, stream);
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if (read_cnt!=count) {
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throw FLANNException("Cannot read from file");
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}
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}
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} // namespace cvflann
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#endif /* _OPENCV_SAVING_H_ */
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