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/*
* GraphToolBinaryReader.hpp
*
* Created on: 02.12.14
* Author: Maximilian Vogel
*/
#ifndef NETWORKIT_IO_GRAPH_TOOL_BINARY_READER_HPP_
#define NETWORKIT_IO_GRAPH_TOOL_BINARY_READER_HPP_
#include <fstream>
#include <string>
#include <networkit/io/GraphReader.hpp>
namespace NetworKit {
class GraphToolBinaryReader final : public GraphReader {
public:
GraphToolBinaryReader() = default; // nullary constructor for Python shell
Graph read(std::string_view path) override;
private:
bool littleEndianness;
void addOutNeighbours(std::ifstream &file, uint64_t numNodes, Graph &G);
std::vector<std::vector<uint64_t>> getOutNeighbours(std::ifstream &file, uint64_t numNodes);
uint8_t getAdjacencyWidth(uint64_t n);
uint64_t getNumNodes(std::ifstream &file);
bool getDirected(std::ifstream &file);
std::string readComment(std::ifstream &file);
bool checkHeader(std::ifstream &file);
template <typename Type>
Type readType(std::ifstream &file, int width) {
Type val = 0;
uint8_t *bytes = new uint8_t[width];
file.read((char *)bytes, width);
if (this->littleEndianness) {
for (int i = 0; i < width; ++i) {
val |= ((Type)bytes[i] << (i * 8));
}
} else {
for (int i = 0; i < width; ++i) {
val |= ((Type)bytes[i] << (width - 1 - i) * 8);
}
}
delete[] bytes;
return val;
}
};
} /* namespace NetworKit */
#endif // NETWORKIT_IO_GRAPH_TOOL_BINARY_READER_HPP_