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#pragma once
#include <cstddef>
#include <cstdint>
#include <filesystem>
#include <memory>
// TODO switch to custom when unit tests are ready and bugs are fixed
#define CPLT_FILESTREAM_USE_CSTDIO
struct IoResult {
enum ErrorKind {
ERR_None,
ERR_PermissionDenied,
ERR_UnexpectedEof,
ERR_Unsupported,
ERR_OutOfSpace,
ERR_Other,
};
ErrorKind Error;
uint32_t SystemError;
size_t BytesMoved;
};
class InputFileStream {
private:
#if defined(CPLT_FILESTREAM_USE_CSTDIO)
FILE* mFile;
#else
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;
#endif
public:
InputFileStream(const std::filesystem::path& path);
~InputFileStream();
InputFileStream(const InputFileStream&) = delete;
InputFileStream& operator=(const InputFileStream&) = delete;
InputFileStream(InputFileStream&&);
InputFileStream& operator=(InputFileStream&&);
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:
#if defined(CPLT_FILESTREAM_USE_CSTDIO)
FILE* mFile;
#else
alignas(void*) char mOsFileHandle[sizeof(void*)];
std::unique_ptr<std::byte[]> mBuffer;
int mMaxBufferSize = 1024;
int mCurrentBufferSize = 0;
#endif
public:
OutputFileStream(const std::filesystem::path& path, WriteMode mode);
~OutputFileStream();
OutputFileStream(const OutputFileStream&) = delete;
OutputFileStream& operator=(const OutputFileStream&) = delete;
OutputFileStream(OutputFileStream&&);
OutputFileStream& operator=(OutputFileStream&&);
int GetMaxBufferSize() const;
void SetMaxBufferSize(int maxSize);
IoResult WriteBytes(size_t bufferLength, const std::byte* buffer);
void FlushBuffer();
};
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