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			36 lines
		
	
	
	
		
			1 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			36 lines
		
	
	
	
		
			1 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
#include "hash.hpp"
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#include <components/misc/hash.hpp>
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#include <cstdint>
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#include <functional>
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#include <istream>
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#include <string>
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namespace Files
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{
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    std::uint64_t getHash(const std::string& fileName, std::istream& stream)
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    {
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        std::uint64_t hash = std::hash<std::string> {}(fileName);
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        try
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        {
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            const auto start = stream.tellg();
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            const auto exceptions = stream.exceptions();
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            stream.exceptions(std::ios_base::badbit);
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            while (stream)
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            {
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                std::uint64_t value = 0;
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                stream.read(reinterpret_cast<char*>(&value), sizeof(value));
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                Misc::hashCombine(hash, value);
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            }
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            stream.exceptions(exceptions);
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            stream.clear();
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            stream.seekg(start);
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        }
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        catch (const std::exception& e)
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        {
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            throw std::runtime_error("Error while reading \"" + fileName + "\" to get hash: " + std::string(e.what()));
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        }
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        return hash;
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    }
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}
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