95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
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// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html.
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//
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// Copyright (C) 2017, Intel Corporation, all rights reserved.
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// Third party copyrights are property of their respective owners.
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#include "test_precomp.hpp"
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#include "npy_blob.hpp"
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namespace cv
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{
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static std::string getType(const std::string& header)
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{
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std::string field = "'descr':";
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int idx = header.find(field);
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CV_Assert(idx != -1);
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int from = header.find('\'', idx + field.size()) + 1;
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int to = header.find('\'', from);
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return header.substr(from, to - from);
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}
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static std::string getFortranOrder(const std::string& header)
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{
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std::string field = "'fortran_order':";
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int idx = header.find(field);
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CV_Assert(idx != -1);
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int from = header.find_last_of(' ', idx + field.size()) + 1;
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int to = header.find(',', from);
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return header.substr(from, to - from);
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}
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static std::vector<int> getShape(const std::string& header)
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{
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std::string field = "'shape':";
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int idx = header.find(field);
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CV_Assert(idx != -1);
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int from = header.find('(', idx + field.size()) + 1;
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int to = header.find(')', from);
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std::string shapeStr = header.substr(from, to - from);
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if (shapeStr.empty())
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return std::vector<int>(1, 1);
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// Remove all commas.
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shapeStr.erase(std::remove(shapeStr.begin(), shapeStr.end(), ','),
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shapeStr.end());
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std::istringstream ss(shapeStr);
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int value;
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std::vector<int> shape;
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while (ss >> value)
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{
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shape.push_back(value);
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}
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return shape;
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}
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Mat blobFromNPY(const std::string& path)
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{
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std::ifstream ifs(path.c_str(), std::ios::binary);
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CV_Assert(ifs.is_open());
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std::string magic(6, '*');
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ifs.read(&magic[0], magic.size());
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CV_Assert(magic == "\x93NUMPY");
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ifs.ignore(1); // Skip major version byte.
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ifs.ignore(1); // Skip minor version byte.
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unsigned short headerSize;
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ifs.read((char*)&headerSize, sizeof(headerSize));
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std::string header(headerSize, '*');
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ifs.read(&header[0], header.size());
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// Extract data type.
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CV_Assert(getType(header) == "<f4");
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CV_Assert(getFortranOrder(header) == "False");
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std::vector<int> shape = getShape(header);
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Mat blob(shape, CV_32F);
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ifs.read((char*)blob.data, blob.total() * blob.elemSize());
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CV_Assert((size_t)ifs.gcount() == blob.total() * blob.elemSize());
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return blob;
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}
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} // namespace cv
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