path: root/src/utils/file.cpp

// Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "PDB repository" project.
// For details, see https://github.com/egor-tensin/pdb-repo.
// Distributed under the MIT License.

#include "pdb/all.hpp"

#include <Windows.h>
#include <safeint.h>

#include <cstddef>
#include <stdexcept>
#include <string>

namespace pdb {
namespace file {

std::size_t get_size(const std::string& path) {
    const Handle handle{CreateFileA(path.c_str(),
                                    FILE_READ_ATTRIBUTES,
                                    FILE_SHARE_READ,
                                    NULL,
                                    OPEN_EXISTING,
                                    FILE_ATTRIBUTE_NORMAL,
                                    NULL)};

    if (handle.get() == INVALID_HANDLE_VALUE)
        throw error::windows(GetLastError());

    LARGE_INTEGER size;

    if (!GetFileSizeEx(handle.get(), &size))
        throw error::windows(GetLastError());

    std::size_t result = 0;

    if (!msl::utilities::SafeCast(size.QuadPart, result))
        throw std::runtime_error{"invalid file size"};

    return result;
}

ID query_id(const std::string& path) {
    const Handle handle{CreateFileA(path.c_str(),
                                    FILE_READ_ATTRIBUTES,
                                    FILE_SHARE_READ | FILE_SHARE_WRITE,
                                    NULL,
                                    OPEN_EXISTING,
                                    FILE_ATTRIBUTE_NORMAL,
                                    NULL)};

    if (handle.get() == INVALID_HANDLE_VALUE)
        throw error::windows(GetLastError());

    FILE_ID_INFO id;

    if (!GetFileInformationByHandleEx(handle.get(), FileIdInfo, &id, sizeof(id)))
        throw error::windows(GetLastError());

    return {id};
}

} // namespace file
} // namespace pdb