66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
#pragma once
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#include <filesystem>
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#include <fstream>
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namespace LXC::Util
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{
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struct FileReadError
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{
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// Different reasons why the error can occur //
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enum Reason
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{
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FileNotFound,
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PermissionDenied,
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NotAFile
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};
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// Constructor to pass arguments to the struct //
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FileReadError(const std::filesystem::path& _path, Reason _reason)
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: path(_path), reason(_reason)
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{}
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// Error information //
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const std::filesystem::path path;
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const Reason reason;
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// Turns the error into a c-string //
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inline static const char* const ReasonStr(const Reason& reason)
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{
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static const char* reasons[] =
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{
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"File cannot be found",
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"File reading permissions are denied",
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"Not a file"
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};
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return reasons[reason];
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}
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};
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inline ReturnVal<std::string, FileReadError> ReadFile(const std::filesystem::path& filepath)
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{
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// Checks the file exists //
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if (!std::filesystem::exists(filepath))
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return FunctionFail(FileReadError(std::filesystem::absolute(filepath), FileReadError::FileNotFound));
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// Checks it is a regular file //
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if (!std::filesystem::is_regular_file(filepath))
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return FunctionFail(FileReadError(std::filesystem::absolute(filepath), FileReadError::NotAFile));
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// Checks it can open the file //
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std::ifstream file(filepath, std::ios::binary | std::ios::ate);
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if (!file)
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return FunctionFail(FileReadError(std::filesystem::absolute(filepath), FileReadError::PermissionDenied));
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// Copies the file to the output string //
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const std::streamsize len = file.tellg();
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file.seekg(0, std::ios::beg);
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std::string contents(len, '\0');
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file.read(&contents[0], len);
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return contents;
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}
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}
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