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// Copyright 2008 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <array>
#include <cstddef>
#include <cstdio>
#include <string>
#include <string_view>
#include "Common/CommonTypes.h"
namespace File
{
enum class SeekOrigin
{
Begin,
Current,
End,
};
enum class SharedAccess
{
Default,
Read,
};
// simple wrapper for cstdlib file functions to
// hopefully will make error checking easier
// and make forgetting an fclose() harder
class IOFile
{
public:
IOFile();
IOFile(std::FILE* file);
IOFile(const std::string& filename, const char openmode[],
SharedAccess sh = SharedAccess::Default);
~IOFile();
IOFile(const IOFile&) = delete;
IOFile& operator=(const IOFile&) = delete;
IOFile(IOFile&& other) noexcept;
IOFile& operator=(IOFile&& other) noexcept;
void Swap(IOFile& other) noexcept;
bool Open(const std::string& filename, const char openmode[],
SharedAccess sh = SharedAccess::Default);
bool Close();
template <typename T>
requires(std::is_trivially_copyable_v<T>)
bool ReadArray(T* elements, size_t count, size_t* num_read = nullptr)
{
size_t read_count = 0;
if (!IsOpen() || count != (read_count = std::fread(elements, sizeof(T), count, m_file)))
m_good = false;
if (num_read)
*num_read = read_count;
return m_good;
}
template <typename T>
requires(std::is_trivially_copyable_v<T>)
bool WriteArray(const T* elements, size_t count)
{
if (!IsOpen() || count != std::fwrite(elements, sizeof(T), count, m_file))
m_good = false;
return m_good;
}
template <typename T, std::size_t N>
bool ReadArray(std::array<T, N>* elements, size_t* num_read = nullptr)
{
return ReadArray(elements->data(), elements->size(), num_read);
}
template <typename T, std::size_t N>
bool WriteArray(const std::array<T, N>& elements)
{
return WriteArray(elements.data(), elements.size());
}
bool ReadBytes(void* data, size_t length) { return ReadArray(static_cast<char*>(data), length); }
bool WriteBytes(const void* data, size_t length)
{
return WriteArray(static_cast<const char*>(data), length);
}
bool WriteString(std::string_view str) { return WriteBytes(str.data(), str.size()); }
bool IsOpen() const { return nullptr != m_file; }
// m_good is set to false when a read, write or other function fails
bool IsGood() const { return m_good; }
explicit operator bool() const { return IsGood() && IsOpen(); }
std::FILE* GetHandle() { return m_file; }
void SetHandle(std::FILE* file);
bool Seek(s64 offset, SeekOrigin origin);
u64 Tell() const;
u64 GetSize() const;
bool Resize(u64 size);
bool Flush();
// clear error state
void ClearError()
{
m_good = true;
if (IsOpen())
std::clearerr(m_file);
}
private:
std::FILE* m_file;
bool m_good;
};
} // namespace File
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