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#pragma once
#include <cstddef>
#include <cstdint>
#include <filesystem>
#include <memory>
struct IoResult
{
enum ErrorKind
{
ERR_None,
ERR_PermissionDenied,
ERR_UnexpectedEof,
ERR_Unsupported,
ERR_OutOfSpace,
ERR_Other,
};
ErrorKind Error;
int32_t SystemError;
size_t BytesMoved;
};
class InputFileStream
{
private:
alignas(void*) char mOsFileHandle[sizeof(void*)];
// mBuffer is always mReadInSize size
std::unique_ptr<std::byte[]> mBuffer;
int mReadInSize = 1024;
int mFirstByteIdx = 0;
int mAvailableBytes = 0;
bool mEof = false;
public:
InputFileStream(const std::filesystem::path& path);
~InputFileStream();
InputFileStream(const InputFileStream&) = delete;
InputFileStream& operator=(const InputFileStream&) = delete;
InputFileStream(InputFileStream&&) = default;
InputFileStream& operator=(InputFileStream&&) = default;
int GetReadInSize() const;
void SetReadInSize(int size);
bool IsEof() const;
IoResult ReadBytes(size_t bufferLength, std::byte* buffer);
};
class OutputFileStream
{
public:
enum WriteMode
{
AppendFile,
TruncateFile,
};
private:
alignas(void*) char mOsFileHandle[sizeof(void*)];
std::unique_ptr<std::byte[]> mBuffer;
int mMaxBufferSize = 1024;
int mCurrentBufferSize = 0;
public:
OutputFileStream(const std::filesystem::path& path, WriteMode mode);
~OutputFileStream();
OutputFileStream(const OutputFileStream&) = delete;
OutputFileStream& operator=(const OutputFileStream&) = delete;
OutputFileStream(OutputFileStream&&) = default;
OutputFileStream& operator=(OutputFileStream&&) = default;
int GetMaxBufferSize() const;
void SetMaxBufferSize(int maxSize);
IoResult WriteBytes(size_t bufferLength, const std::byte* buffer);
void FlushBuffer();
};
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