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			106 lines
		
	
	
	
		
			2.7 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			106 lines
		
	
	
	
		
			2.7 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
#include "file.hpp"
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#include <cassert>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdexcept>
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#include <string.h>
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#include <string>
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#include <sys/types.h>
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#include <unistd.h>
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#include <components/files/conversion.hpp>
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namespace Platform::File
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{
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    static auto getNativeHandle(Handle handle)
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    {
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        assert(handle != Handle::Invalid);
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        return static_cast<int>(handle);
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    }
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    static int getNativeSeekType(SeekType seek)
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    {
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        if (seek == SeekType::Begin)
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            return SEEK_SET;
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        if (seek == SeekType::Current)
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            return SEEK_CUR;
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        if (seek == SeekType::End)
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            return SEEK_END;
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        return -1;
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    }
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    Handle open(const std::filesystem::path& filename)
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    {
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#ifdef O_BINARY
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        static const int openFlags = O_RDONLY | O_BINARY;
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#else
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        static const int openFlags = O_RDONLY;
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#endif
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        auto handle = ::open(filename.c_str(), openFlags, 0);
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        if (handle == -1)
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        {
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            throw std::system_error(errno, std::generic_category(),
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                std::string("Failed to open '") + Files::pathToUnicodeString(filename) + "' for reading");
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        }
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        return static_cast<Handle>(handle);
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    }
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    void close(Handle handle)
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    {
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        auto nativeHandle = getNativeHandle(handle);
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        ::close(nativeHandle);
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    }
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    void seek(Handle handle, size_t position, SeekType type /*= SeekType::Begin*/)
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    {
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        const auto nativeHandle = getNativeHandle(handle);
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        const auto nativeSeekType = getNativeSeekType(type);
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        if (::lseek(nativeHandle, position, nativeSeekType) == -1)
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        {
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            throw std::system_error(errno, std::generic_category(), "An lseek() call failed");
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        }
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    }
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    size_t size(Handle handle)
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    {
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        const auto oldPos = tell(handle);
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        seek(handle, 0, SeekType::End);
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        const auto fileSize = tell(handle);
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        seek(handle, oldPos, SeekType::Begin);
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        return static_cast<size_t>(fileSize);
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    }
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    size_t tell(Handle handle)
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    {
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        auto nativeHandle = getNativeHandle(handle);
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        size_t position = ::lseek(nativeHandle, 0, SEEK_CUR);
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        if (position == size_t(-1))
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        {
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            throw std::system_error(errno, std::generic_category(), "An lseek() call failed");
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        }
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        return position;
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    }
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    size_t read(Handle handle, void* data, size_t size)
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    {
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        auto nativeHandle = getNativeHandle(handle);
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        int amount = ::read(nativeHandle, data, size);
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        if (amount == -1)
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        {
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            throw std::system_error(
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                errno, std::generic_category(), "An attempt to read " + std::to_string(size) + " bytes failed");
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        }
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        return amount;
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    }
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}
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