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38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
#ifndef COMPONENTS_FILES_UTILS_H
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#define COMPONENTS_FILES_UTILS_H
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#include <cerrno>
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#include <format>
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#include <istream>
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#include <stdexcept>
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#include <system_error>
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namespace Files
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{
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inline std::streamsize getStreamSizeLeft(std::istream& stream)
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{
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const auto begin = stream.tellg();
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if (stream.fail())
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throw std::runtime_error(
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std::format("Failed to get current file position: {}", std::generic_category().message(errno)));
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stream.seekg(0, std::ios_base::end);
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if (stream.fail())
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throw std::runtime_error(
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std::format("Failed to seek end file position: {}", std::generic_category().message(errno)));
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const auto end = stream.tellg();
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if (stream.fail())
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throw std::runtime_error(
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std::format("Failed to get current file position: {}", std::generic_category().message(errno)));
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stream.seekg(begin);
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if (stream.fail())
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throw std::runtime_error(
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std::format("Failed to seek original file position: {}", std::generic_category().message(errno)));
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return end - begin;
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}
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}
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#endif
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