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#pragma once
#include <string>
#include <cstdint>
#include <cstdio>
#include <optional>
// Call this when initializing the plugin so that the process file descriptor limit is raised.
uint64_t AdjustFileDescriptorLimit();
enum MapStatus : int
{
Success,
// TODO: Split this error out into more contextual errors.
Error,
};
struct MappedFile
{
uint8_t* _mmap = nullptr;
size_t len = 0;
#ifdef _MSC_VER
HANDLE hFile = INVALID_HANDLE_VALUE;
#else
FILE* fd = nullptr;
#endif
MappedFile() = default;
~MappedFile();
MappedFile(const MappedFile&) = delete;
MappedFile& operator=(const MappedFile&) = delete;
MappedFile(MappedFile&& other) noexcept : _mmap(other._mmap), len(other.len)
{
#ifdef _MSC_VER
hFile = other.hFile;
// Don't close the hFile in the move.
other.hFile = nullptr;
#else
fd = other.fd;
// Don't close the fd in the move.
other.fd = nullptr;
#endif
other._mmap = nullptr;
}
// I hate C++
MappedFile& operator=(MappedFile&& other) noexcept
{
if (this != &other)
{
Unmap();
#ifdef _MSC_VER
if (hFile != nullptr)
{
CloseHandle(hFile);
}
hFile = other.hFile;
// Don't close the hFile in the move.
other.hFile = nullptr;
#else
if (fd != nullptr)
{
fclose(fd);
}
fd = other.fd;
// Don't close the fd in the move.
other.fd = nullptr;
#endif
len = other.len;
_mmap = other._mmap;
other._mmap = nullptr;
}
return *this;
}
static std::optional<MappedFile> OpenFile(const std::string& path);
MapStatus Map();
MapStatus Unmap();
};
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