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transmission/libtransmission/file-win32.cc

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// This file Copyright © Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <algorithm>
#include <cctype> // for isalpha()
#include <cstring>
#include <ctime>
#include <iterator> // for std::back_inserter
#include <optional>
#include <string>
#include <string_view>
#include <shlobj.h> /* SHCreateDirectoryEx() */
#include <winioctl.h> /* FSCTL_SET_SPARSE */
#include <fmt/core.h>
#include "libtransmission/transmission.h"
#include "libtransmission/crypto-utils.h" /* tr_rand_int() */
#include "libtransmission/error.h"
#include "libtransmission/file.h"
#include "libtransmission/tr-assert.h"
#include "libtransmission/utils.h"
using namespace std::literals;
#ifndef MAXSIZE_T
#define MAXSIZE_T ((SIZE_T) ~((SIZE_T)0))
#endif
/* MSDN (http://msdn.microsoft.com/en-us/library/2k2xf226.aspx) only mentions
"i64" suffix for C code, but no warning is issued */
#define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL
struct tr_sys_dir_win32
{
std::wstring pattern;
HANDLE find_handle = INVALID_HANDLE_VALUE;
WIN32_FIND_DATAW find_data = {};
std::string utf8_name;
};
namespace
{
auto constexpr NativeLocalPathPrefix = L"\\\\?\\"sv;
auto constexpr NativeUncPathPrefix = L"\\\\?\\UNC\\"sv;
void set_system_error(tr_error* error, DWORD code)
{
if (error != nullptr)
{
auto const message = tr_win32_format_message(code);
error->set(code, !std::empty(message) ? message : fmt::format("Unknown error: {:#08x}", code));
}
}
void set_system_error_if_file_found(tr_error* error, DWORD code)
{
if (code != ERROR_FILE_NOT_FOUND && code != ERROR_PATH_NOT_FOUND && code != ERROR_NO_MORE_FILES)
{
set_system_error(error, code);
}
}
constexpr time_t filetime_to_unix_time(FILETIME const& t)
{
uint64_t tmp = 0;
tmp |= t.dwHighDateTime;
tmp <<= 32;
tmp |= t.dwLowDateTime;
tmp /= 10; /* to microseconds */
tmp -= DELTA_EPOCH_IN_MICROSECS;
return tmp / 1000000UL;
}
constexpr auto stat_to_sys_path_info(DWORD attributes, DWORD size_low, DWORD size_high, FILETIME const& mtime)
{
auto info = tr_sys_path_info{};
if ((attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
info.type = TR_SYS_PATH_IS_DIRECTORY;
}
else if ((attributes & (FILE_ATTRIBUTE_DEVICE | FILE_ATTRIBUTE_REPARSE_POINT | FILE_ATTRIBUTE_VIRTUAL)) == 0)
{
info.type = TR_SYS_PATH_IS_FILE;
}
else
{
info.type = TR_SYS_PATH_IS_OTHER;
}
info.size = size_high;
info.size <<= 32;
info.size |= size_low;
info.last_modified_at = filetime_to_unix_time(mtime);
return info;
}
auto constexpr Slashes = "\\/"sv;
constexpr bool is_slash(char c)
{
return tr_strv_contains(Slashes, c);
}
constexpr bool is_unc_path(std::string_view path)
{
return std::size(path) >= 2 && is_slash(path[0]) && path[1] == path[0];
}
bool is_valid_path(std::string_view path)
{
if (is_unc_path(path))
{
if (path[2] != '\0' && !isalnum(path[2]))
{
return false;
}
}
else
{
auto pos = path.find(':');
if (pos != path.npos)
{
if (pos != 1 || !isalpha(path[0]))
{
return false;
}
path.remove_prefix(2);
}
}
return path.find_first_of("<>:\"|?*"sv) == path.npos;
}
auto path_to_fixed_native_path(std::string_view path)
{
auto wide_path = tr_win32_utf8_to_native(path);
// convert '/' to '\'
static auto constexpr Convert = [](wchar_t wch)
{
return wch == L'/' ? L'\\' : wch;
};
std::transform(std::begin(wide_path), std::end(wide_path), std::begin(wide_path), Convert);
// squash multiple consecutive separators into one to avoid ERROR_INVALID_NAME
static auto constexpr Equal = [](wchar_t a, wchar_t b)
{
return a == b && a == L'\\';
};
auto const tmp = wide_path;
wide_path.clear();
std::unique_copy(std::begin(tmp), std::end(tmp), std::back_inserter(wide_path), Equal);
return wide_path;
}
/* Extending maximum path length limit up to ~32K. See "Naming Files, Paths, and Namespaces"
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247.aspx for more info */
auto path_to_native_path(std::string_view path)
{
if (is_unc_path(path))
{
// UNC path: "\\server\share" -> "\\?\UNC\server\share"
path.remove_prefix(2); // remove path's UNC prefix slashes
auto wide_path = path_to_fixed_native_path(path);
wide_path.insert(0, NativeUncPathPrefix);
return wide_path;
}
if (!tr_sys_path_is_relative(path))
{
// local path: "C:" -> "\\?\C:"
auto wide_path = path_to_fixed_native_path(path);
wide_path.insert(0, NativeLocalPathPrefix);
return wide_path;
}
return path_to_fixed_native_path(path);
}
std::string native_path_to_path(std::wstring_view wide_path)
{
if (std::empty(wide_path))
{
return {};
}
if (tr_strv_starts_with(wide_path, NativeUncPathPrefix))
{
wide_path.remove_prefix(std::size(NativeUncPathPrefix));
auto path = tr_win32_native_to_utf8(wide_path);
path.insert(0, "\\\\"sv);
return path;
}
if (tr_strv_starts_with(wide_path, NativeLocalPathPrefix))
{
wide_path.remove_prefix(std::size(NativeLocalPathPrefix));
return tr_win32_native_to_utf8(wide_path);
}
return tr_win32_native_to_utf8(wide_path);
}
tr_sys_file_t open_file(std::string_view path, DWORD access, DWORD disposition, DWORD flags, tr_error* error)
{
tr_sys_file_t ret = TR_BAD_SYS_FILE;
if (auto const wide_path = path_to_native_path(path); !std::empty(wide_path))
{
ret = CreateFileW(
wide_path.c_str(),
access,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
nullptr,
disposition,
flags,
nullptr);
}
if (ret == TR_BAD_SYS_FILE)
{
set_system_error(error, GetLastError());
}
return ret;
}
bool create_dir(std::string_view path, int flags, int /*permissions*/, bool okay_if_exists, tr_error* error)
{
bool ret;
DWORD error_code = ERROR_SUCCESS;
auto const wide_path = path_to_native_path(path);
// already exists (no-op)
if (auto const info = tr_sys_path_get_info(path); info && info->isFolder())
{
return true;
}
if ((flags & TR_SYS_DIR_CREATE_PARENTS) != 0)
{
error_code = SHCreateDirectoryExW(nullptr, wide_path.c_str(), nullptr);
ret = error_code == ERROR_SUCCESS;
}
else
{
ret = CreateDirectoryW(wide_path.c_str(), nullptr);
if (!ret)
{
error_code = GetLastError();
}
}
if (!ret && error_code == ERROR_ALREADY_EXISTS && okay_if_exists)
{
DWORD const attributes = GetFileAttributesW(wide_path.c_str());
if (attributes != INVALID_FILE_ATTRIBUTES && (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
ret = true;
}
}
if (!ret)
{
set_system_error(error, error_code);
}
return ret;
}
void create_temp_path(
char* path_template,
void (*callback)(char const* path, void* param, tr_error* error),
void* callback_param,
tr_error* error)
{
TR_ASSERT(path_template != nullptr);
TR_ASSERT(callback != nullptr);
auto path = std::string{ path_template };
auto path_size = std::size(path);
TR_ASSERT(path_size > 0);
auto local_error = tr_error{};
for (int attempt = 0; attempt < 100; ++attempt)
{
size_t i = path_size;
while (i > 0 && path_template[i - 1] == 'X')
{
static auto constexpr Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"sv;
path[i - 1] = Chars[tr_rand_int(std::size(Chars))];
--i;
}
TR_ASSERT(path_size >= i + 6);
local_error = {};
(*callback)(path.c_str(), callback_param, &local_error);
if (!local_error)
{
break;
}
}
if (!local_error)
{
std::copy_n(std::begin(path), path_size, path_template);
}
else if (error != nullptr)
{
*error = std::move(local_error);
}
}
std::optional<tr_sys_path_info> tr_sys_file_get_info_(tr_sys_file_t handle, tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
auto attributes = BY_HANDLE_FILE_INFORMATION{};
if (GetFileInformationByHandle(handle, &attributes))
{
return stat_to_sys_path_info(
attributes.dwFileAttributes,
attributes.nFileSizeLow,
attributes.nFileSizeHigh,
attributes.ftLastWriteTime);
}
set_system_error(error, GetLastError());
return {};
}
std::optional<BY_HANDLE_FILE_INFORMATION> get_file_info(char const* path, tr_error* error)
{
auto const wpath = path_to_native_path(path);
if (std::empty(wpath))
{
set_system_error_if_file_found(error, GetLastError());
return {};
}
auto const handle = CreateFileW(wpath.c_str(), 0, 0, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
if (handle == INVALID_HANDLE_VALUE)
{
set_system_error_if_file_found(error, GetLastError());
return {};
}
// TODO: Use GetFileInformationByHandleEx on >= Server 2012
auto info = BY_HANDLE_FILE_INFORMATION{};
if (!GetFileInformationByHandle(handle, &info))
{
set_system_error_if_file_found(error, GetLastError());
CloseHandle(handle);
return {};
}
CloseHandle(handle);
return info;
}
void file_open_temp_callback(char const* path, void* param, tr_error* error)
{
auto* const result = static_cast<tr_sys_file_t*>(param);
TR_ASSERT(result != nullptr);
*result = open_file(path, GENERIC_READ | GENERIC_WRITE, CREATE_NEW, FILE_ATTRIBUTE_TEMPORARY, error);
}
void dir_create_temp_callback(char const* path, void* param, tr_error* error)
{
auto* const result = static_cast<bool*>(param);
TR_ASSERT(result != nullptr);
*result = create_dir(path, 0, 0, false, error);
}
} // namespace
bool tr_sys_path_exists(char const* path, tr_error* error)
{
TR_ASSERT(path != nullptr);
bool ret = false;
HANDLE handle = INVALID_HANDLE_VALUE;
if (auto const wide_path = path_to_native_path(path); !std::empty(wide_path))
{
DWORD attributes = GetFileAttributesW(wide_path.c_str());
if (attributes != INVALID_FILE_ATTRIBUTES)
{
if ((attributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0)
{
handle = CreateFileW(wide_path.c_str(), 0, 0, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
ret = handle != INVALID_HANDLE_VALUE;
}
else
{
ret = true;
}
}
}
if (!ret)
{
set_system_error_if_file_found(error, GetLastError());
}
if (handle != INVALID_HANDLE_VALUE)
{
CloseHandle(handle);
}
return ret;
}
std::optional<tr_sys_path_info> tr_sys_path_get_info(std::string_view path, int flags, tr_error* error)
{
if (auto const wide_path = path_to_native_path(path); std::empty(wide_path))
{
// do nothing
}
else if ((flags & TR_SYS_PATH_NO_FOLLOW) != 0)
{
auto attributes = WIN32_FILE_ATTRIBUTE_DATA{};
if (GetFileAttributesExW(wide_path.c_str(), GetFileExInfoStandard, &attributes))
{
return stat_to_sys_path_info(
attributes.dwFileAttributes,
attributes.nFileSizeLow,
attributes.nFileSizeHigh,
attributes.ftLastWriteTime);
}
}
else if (auto const
handle = CreateFileW(wide_path.c_str(), 0, 0, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
handle != INVALID_HANDLE_VALUE)
{
auto ret = tr_sys_file_get_info_(handle, error);
CloseHandle(handle);
return ret;
}
set_system_error(error, GetLastError());
return {};
}
bool tr_sys_path_is_relative(std::string_view path)
{
/* UNC path: `\\...`. */
if (is_unc_path(path))
{
return false;
}
/* Local path: `X:` */
if (std::size(path) == 2 && isalpha(path[0]) && path[1] == ':')
{
return false;
}
/* Local path: `X:\...`. */
if (std::size(path) > 2 && isalpha(path[0]) && path[1] == ':' && is_slash(path[2]))
{
return false;
}
return true;
}
bool tr_sys_path_is_same(char const* path1, char const* path2, tr_error* error)
{
TR_ASSERT(path1 != nullptr);
TR_ASSERT(path2 != nullptr);
auto const fi1 = get_file_info(path1, error);
if (!fi1)
{
return false;
}
auto const fi2 = get_file_info(path2, error);
if (!fi2)
{
return false;
}
return fi1->dwVolumeSerialNumber == fi2->dwVolumeSerialNumber && fi1->nFileIndexHigh == fi2->nFileIndexHigh &&
fi1->nFileIndexLow == fi2->nFileIndexLow;
}
std::string tr_sys_path_resolve(std::string_view path, tr_error* error)
{
auto ret = std::string{};
if (auto const wide_path = path_to_native_path(path); !std::empty(wide_path))
{
if (auto const handle = CreateFileW(
wide_path.c_str(),
FILE_READ_EA,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
nullptr,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
nullptr);
handle != INVALID_HANDLE_VALUE)
{
if (auto const wide_ret_size = GetFinalPathNameByHandleW(handle, nullptr, 0, 0); wide_ret_size != 0)
{
auto wide_ret = std::wstring{};
wide_ret.resize(wide_ret_size);
if (GetFinalPathNameByHandleW(handle, std::data(wide_ret), wide_ret_size, 0) == wide_ret_size - 1)
{
// `wide_ret_size` includes the terminating '\0'; remove it from `wide_ret`
wide_ret.resize(std::size(wide_ret) - 1);
TR_ASSERT(tr_strv_starts_with(wide_ret, NativeLocalPathPrefix));
ret = native_path_to_path(wide_ret);
}
}
CloseHandle(handle);
}
}
if (!std::empty(ret))
{
return ret;
}
set_system_error(error, GetLastError());
return {};
}
std::string_view tr_sys_path_basename(std::string_view path, tr_error* error)
{
if (std::empty(path))
{
return "."sv;
}
if (!is_valid_path(path))
{
set_system_error(error, ERROR_PATH_NOT_FOUND);
return {};
}
// Remove all trailing slashes.
// If nothing is left, return "/"
if (auto const pos = path.find_last_not_of(Slashes); pos != std::string_view::npos)
{
path = path.substr(0, pos + 1);
}
else // all slashes
{
return "/"sv;
}
if (auto pos = path.find_last_of("\\/:"); pos != std::string_view::npos)
{
path.remove_prefix(pos + 1);
}
return !std::empty(path) ? path : "/"sv;
}
[[nodiscard]] static bool isWindowsDeviceRoot(char ch) noexcept
{
return isalpha(static_cast<int>(ch)) != 0;
}
[[nodiscard]] static constexpr bool isPathSeparator(char ch) noexcept
{
return ch == '/' || ch == '\\';
}
// This function is adapted from Node.js's path.win32.dirname() function,
// which is copyrighted by Joyent, Inc. and other Node contributors
// and is distributed under MIT (SPDX:MIT) license.
std::string_view tr_sys_path_dirname(std::string_view path)
{
auto const len = std::size(path);
if (len == 0)
{
return "."sv;
}
if (len == 1)
{
return isPathSeparator(path[0]) ? path : "."sv;
}
auto root_end = std::string_view::npos;
auto offset = std::string_view::size_type{ 0 };
// Try to match a root
if (isPathSeparator(path[0]))
{
// Possible UNC root
root_end = offset = 1;
if (isPathSeparator(path[1]))
{
// Matched double path separator at beginning
std::string_view::size_type j = 2;
std::string_view::size_type last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path[j]))
{
j++;
}
if (j < len && j != last)
{
// Matched!
last = j;
// Match 1 or more path separators
while (j < len && isPathSeparator(path[j]))
{
j++;
}
if (j < len && j != last)
{
// Matched!
last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path[j]))
{
j++;
}
if (j == len)
{
// We matched a UNC root only
return path;
}
if (j != last)
{
// We matched a UNC root with leftovers
// Offset by 1 to include the separator after the UNC root to
// treat it as a "normal root" on top of a (UNC) root
root_end = offset = j + 1;
}
}
}
}
// Possible device root
}
else if (isWindowsDeviceRoot(path[0]) && path[1] == ':')
{
root_end = len > 2 && isPathSeparator(path[2]) ? 3 : 2;
offset = root_end;
}
auto end = std::string_view::npos;
auto matched_slash = bool{ true };
for (std::string_view::size_type i = len - 1; i >= offset; --i)
{
if (isPathSeparator(path[i]))
{
if (!matched_slash)
{
end = i;
break;
}
}
else
{
// We saw the first non-path separator
matched_slash = false;
}
if (i <= offset)
{
break;
}
}
if (end == std::string_view::npos)
{
if (root_end == std::string_view::npos)
{
return "."sv;
}
end = root_end;
}
return path.substr(0, end);
}
bool tr_sys_path_rename(char const* src_path, char const* dst_path, tr_error* error)
{
TR_ASSERT(src_path != nullptr);
TR_ASSERT(dst_path != nullptr);
bool ret = false;
auto const wide_src_path = path_to_native_path(src_path);
auto const wide_dst_path = path_to_native_path(dst_path);
if (!std::empty(wide_src_path) && !std::empty(wide_dst_path))
{
DWORD flags = MOVEFILE_REPLACE_EXISTING;
DWORD attributes;
attributes = GetFileAttributesW(wide_src_path.c_str());
if (attributes != INVALID_FILE_ATTRIBUTES && (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
flags = 0;
}
else
{
attributes = GetFileAttributesW(wide_dst_path.c_str());
if (attributes != INVALID_FILE_ATTRIBUTES && (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
flags = 0;
}
}
ret = MoveFileExW(wide_src_path.c_str(), wide_dst_path.c_str(), flags);
}
if (!ret)
{
set_system_error(error, GetLastError());
}
return ret;
}
bool tr_sys_path_copy(char const* src_path, char const* dst_path, tr_error* error)
{
TR_ASSERT(src_path != nullptr);
TR_ASSERT(dst_path != nullptr);
auto const wide_src_path = path_to_native_path(src_path);
auto const wide_dst_path = path_to_native_path(dst_path);
if (std::empty(wide_src_path) || std::empty(wide_dst_path))
{
set_system_error(error, ERROR_INVALID_PARAMETER);
return false;
}
auto cancel = BOOL{ FALSE };
DWORD const flags = COPY_FILE_ALLOW_DECRYPTED_DESTINATION | COPY_FILE_FAIL_IF_EXISTS;
if (CopyFileExW(wide_src_path.c_str(), wide_dst_path.c_str(), nullptr, nullptr, &cancel, flags) == 0)
{
set_system_error(error, GetLastError());
return false;
}
return true;
}
bool tr_sys_path_remove(char const* path, tr_error* error)
{
TR_ASSERT(path != nullptr);
bool ret = false;
if (auto const wide_path = path_to_native_path(path); !std::empty(wide_path))
{
DWORD const attributes = GetFileAttributesW(wide_path.c_str());
if (attributes != INVALID_FILE_ATTRIBUTES)
{
if ((attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
ret = RemoveDirectoryW(wide_path.c_str());
}
else
{
ret = DeleteFileW(wide_path.c_str());
}
}
}
if (!ret)
{
set_system_error(error, GetLastError());
}
return ret;
}
char* tr_sys_path_native_separators(char* path)
{
if (path == nullptr)
{
return nullptr;
}
for (char* slash = strchr(path, '/'); slash != nullptr; slash = strchr(slash, '/'))
{
*slash = '\\';
}
return path;
}
tr_sys_file_t tr_sys_file_open(char const* path, int flags, int /*permissions*/, tr_error* error)
{
TR_ASSERT(path != nullptr);
TR_ASSERT((flags & (TR_SYS_FILE_READ | TR_SYS_FILE_WRITE)) != 0);
tr_sys_file_t ret;
DWORD native_access = 0;
DWORD native_disposition = OPEN_EXISTING;
DWORD native_flags = FILE_ATTRIBUTE_NORMAL;
bool success;
if ((flags & TR_SYS_FILE_READ) != 0)
{
native_access |= GENERIC_READ;
}
if ((flags & TR_SYS_FILE_WRITE) != 0)
{
native_access |= GENERIC_WRITE;
}
if ((flags & TR_SYS_FILE_CREATE) != 0)
{
native_disposition = (flags & TR_SYS_FILE_TRUNCATE) != 0 ? CREATE_ALWAYS : OPEN_ALWAYS;
}
else if ((flags & TR_SYS_FILE_TRUNCATE) != 0)
{
native_disposition = TRUNCATE_EXISTING;
}
if ((flags & TR_SYS_FILE_SEQUENTIAL) != 0)
{
native_flags |= FILE_FLAG_SEQUENTIAL_SCAN;
}
ret = open_file(path, native_access, native_disposition, native_flags, error);
success = ret != TR_BAD_SYS_FILE;
if (success && (flags & TR_SYS_FILE_APPEND) != 0)
{
success = SetFilePointer(ret, 0, nullptr, FILE_END) != INVALID_SET_FILE_POINTER;
}
if (!success)
{
set_system_error(error, GetLastError());
CloseHandle(ret);
ret = TR_BAD_SYS_FILE;
}
return ret;
}
tr_sys_file_t tr_sys_file_open_temp(char* path_template, tr_error* error)
{
TR_ASSERT(path_template != nullptr);
tr_sys_file_t ret = TR_BAD_SYS_FILE;
create_temp_path(path_template, file_open_temp_callback, &ret, error);
return ret;
}
bool tr_sys_file_close(tr_sys_file_t handle, tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
bool ret = CloseHandle(handle);
if (!ret)
{
set_system_error(error, GetLastError());
}
return ret;
}
bool tr_sys_file_read(tr_sys_file_t handle, void* buffer, uint64_t size, uint64_t* bytes_read, tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
TR_ASSERT(buffer != nullptr || size == 0);
if (size > MAXDWORD)
{
set_system_error(error, ERROR_INVALID_PARAMETER);
return false;
}
bool ret = false;
DWORD my_bytes_read;
if (ReadFile(handle, buffer, (DWORD)size, &my_bytes_read, nullptr))
{
if (bytes_read != nullptr)
{
*bytes_read = my_bytes_read;
}
ret = true;
}
else
{
set_system_error(error, GetLastError());
}
return ret;
}
bool tr_sys_file_read_at(
tr_sys_file_t handle,
void* buffer,
uint64_t size,
uint64_t offset,
uint64_t* bytes_read,
tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
TR_ASSERT(buffer != nullptr || size == 0);
if (size > MAXDWORD)
{
set_system_error(error, ERROR_INVALID_PARAMETER);
return false;
}
bool ret = false;
OVERLAPPED overlapped;
DWORD my_bytes_read;
overlapped.Offset = (DWORD)offset;
offset >>= 32;
overlapped.OffsetHigh = (DWORD)offset;
overlapped.hEvent = nullptr;
if (ReadFile(handle, buffer, (DWORD)size, &my_bytes_read, &overlapped))
{
if (bytes_read != nullptr)
{
*bytes_read = my_bytes_read;
}
ret = true;
}
else
{
set_system_error(error, GetLastError());
}
return ret;
}
bool tr_sys_file_write(tr_sys_file_t handle, void const* buffer, uint64_t size, uint64_t* bytes_written, tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
TR_ASSERT(buffer != nullptr || size == 0);
if (size > MAXDWORD)
{
set_system_error(error, ERROR_INVALID_PARAMETER);
return false;
}
bool ret = false;
DWORD my_bytes_written;
if (WriteFile(handle, buffer, (DWORD)size, &my_bytes_written, nullptr))
{
if (bytes_written != nullptr)
{
*bytes_written = my_bytes_written;
}
ret = true;
}
else
{
set_system_error(error, GetLastError());
}
return ret;
}
bool tr_sys_file_write_at(
tr_sys_file_t handle,
void const* buffer,
uint64_t size,
uint64_t offset,
uint64_t* bytes_written,
tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
TR_ASSERT(buffer != nullptr || size == 0);
if (size > MAXDWORD)
{
set_system_error(error, ERROR_INVALID_PARAMETER);
return false;
}
bool ret = false;
OVERLAPPED overlapped;
DWORD my_bytes_written;
overlapped.Offset = (DWORD)offset;
offset >>= 32;
overlapped.OffsetHigh = (DWORD)offset;
overlapped.hEvent = nullptr;
if (WriteFile(handle, buffer, (DWORD)size, &my_bytes_written, &overlapped))
{
if (bytes_written != nullptr)
{
*bytes_written = my_bytes_written;
}
ret = true;
}
else
{
set_system_error(error, GetLastError());
}
return ret;
}
bool tr_sys_file_truncate(tr_sys_file_t handle, uint64_t size, tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
FILE_END_OF_FILE_INFO info;
info.EndOfFile.QuadPart = size;
bool ret = SetFileInformationByHandle(handle, FileEndOfFileInfo, &info, sizeof(info));
if (!ret)
{
set_system_error(error, GetLastError());
}
return ret;
}
bool tr_sys_file_preallocate(tr_sys_file_t handle, uint64_t size, int flags, tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
if ((flags & TR_SYS_FILE_PREALLOC_SPARSE) != 0)
{
DWORD tmp;
if (!DeviceIoControl(handle, FSCTL_SET_SPARSE, nullptr, 0, nullptr, 0, &tmp, nullptr))
{
set_system_error(error, GetLastError());
return false;
}
}
return tr_sys_file_truncate(handle, size, error);
}
bool tr_sys_file_lock(tr_sys_file_t handle, int operation, tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
TR_ASSERT((operation & ~(TR_SYS_FILE_LOCK_SH | TR_SYS_FILE_LOCK_EX | TR_SYS_FILE_LOCK_NB | TR_SYS_FILE_LOCK_UN)) == 0);
TR_ASSERT(
!!(operation & TR_SYS_FILE_LOCK_SH) + !!(operation & TR_SYS_FILE_LOCK_EX) + !!(operation & TR_SYS_FILE_LOCK_UN) == 1);
bool ret;
auto overlapped = OVERLAPPED{};
if ((operation & TR_SYS_FILE_LOCK_UN) == 0)
{
DWORD native_flags = 0;
if ((operation & TR_SYS_FILE_LOCK_EX) != 0)
{
native_flags |= LOCKFILE_EXCLUSIVE_LOCK;
}
if ((operation & TR_SYS_FILE_LOCK_NB) != 0)
{
native_flags |= LOCKFILE_FAIL_IMMEDIATELY;
}
ret = LockFileEx(handle, native_flags, 0, MAXDWORD, MAXDWORD, &overlapped) != FALSE;
}
else
{
ret = UnlockFileEx(handle, 0, MAXDWORD, MAXDWORD, &overlapped) != FALSE;
}
if (!ret)
{
set_system_error(error, GetLastError());
}
return ret;
}
std::string tr_sys_dir_get_current(tr_error* error)
{
if (auto const size = GetCurrentDirectoryW(0, nullptr); size != 0)
{
auto wide_ret = std::wstring{};
wide_ret.resize(size);
if (GetCurrentDirectoryW(std::size(wide_ret), std::data(wide_ret)) != 0)
{
// `size` includes the terminating '\0'; remove it from `wide_ret`
wide_ret.resize(std::size(wide_ret) - 1);
return tr_win32_native_to_utf8(wide_ret);
}
}
set_system_error(error, GetLastError());
return {};
}
bool tr_sys_dir_create(char const* path, int flags, int permissions, tr_error* error)
{
return create_dir(path, flags, permissions, true, error);
}
bool tr_sys_dir_create_temp(char* path_template, tr_error* error)
{
TR_ASSERT(path_template != nullptr);
bool ret = false;
create_temp_path(path_template, dir_create_temp_callback, &ret, error);
return ret;
}
tr_sys_dir_t tr_sys_dir_open(std::string_view path, tr_error* error)
{
TR_ASSERT(!std::empty(path));
if (auto const info = tr_sys_path_get_info(path, 0); !info || !info->isFolder())
{
set_system_error(error, ERROR_DIRECTORY);
return TR_BAD_SYS_DIR;
}
auto const pattern = path_to_native_path(path);
if (std::empty(pattern))
{
set_system_error(error, GetLastError());
return TR_BAD_SYS_DIR;
}
auto* const ret = new tr_sys_dir_win32{};
ret->pattern = pattern;
ret->pattern.append(L"\\*");
return ret;
}
char const* tr_sys_dir_read_name(tr_sys_dir_t handle, tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_DIR);
DWORD error_code = ERROR_SUCCESS;
if (handle->find_handle == INVALID_HANDLE_VALUE)
{
handle->find_handle = FindFirstFileW(handle->pattern.c_str(), &handle->find_data);
if (handle->find_handle == INVALID_HANDLE_VALUE)
{
error_code = GetLastError();
}
}
else
{
if (!FindNextFileW(handle->find_handle, &handle->find_data))
{
error_code = GetLastError();
}
}
if (error_code != ERROR_SUCCESS)
{
set_system_error_if_file_found(error, error_code);
return nullptr;
}
if (auto const utf8 = tr_win32_native_to_utf8(handle->find_data.cFileName); !std::empty(utf8))
{
handle->utf8_name = utf8;
return handle->utf8_name.c_str();
}
set_system_error(error, GetLastError());
return nullptr;
}
bool tr_sys_dir_close(tr_sys_dir_t handle, tr_error* error)
{
TR_ASSERT(handle != TR_BAD_SYS_DIR);
bool ret = FindClose(handle->find_handle);
if (!ret)
{
set_system_error(error, GetLastError());
}
delete handle;
return ret;
}
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