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			96 lines
		
	
	
	
		
			2.7 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			96 lines
		
	
	
	
		
			2.7 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
| #include "file.hpp"
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| 
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| #include <cassert>
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| #include <errno.h>
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| #include <stdexcept>
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| #include <string.h>
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| #include <string>
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| 
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| #include <components/files/conversion.hpp>
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| 
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| namespace Platform::File
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| {
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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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| 
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|         return reinterpret_cast<FILE*>(static_cast<intptr_t>(handle));
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|     }
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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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| 
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|     Handle open(const std::filesystem::path& filename)
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|     {
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|         FILE* handle = fopen(filename.c_str(), "rb");
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|         if (handle == nullptr)
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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>(reinterpret_cast<intptr_t>(handle));
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|     }
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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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|         fclose(nativeHandle);
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|     }
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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 (fseek(nativeHandle, position, nativeSeekType) != 0)
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|         {
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|             throw std::system_error(errno, std::generic_category(), std::string("An fseek() call failed"));
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|         }
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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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|         auto nativeHandle = getNativeHandle(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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| 
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|         return static_cast<size_t>(fileSize);
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|     }
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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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| 
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|         long position = ftell(nativeHandle);
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|         if (position == -1)
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|         {
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|             throw std::system_error(errno, std::generic_category(), std::string("An ftell() call failed"));
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|         }
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|         return static_cast<size_t>(position);
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|     }
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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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| 
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|         int amount = fread(data, 1, size, nativeHandle);
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|         if (amount == 0 && ferror(nativeHandle))
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|         {
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|             throw std::system_error(errno, std::generic_category(),
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|                 std::string("An attempt to read ") + std::to_string(size) + " bytes failed");
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|         }
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|         return static_cast<size_t>(amount);
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|     }
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| 
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| }
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