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transmission/libtransmission/file-win32.cc
Charles Kerr c472cbd88d
refactor: only use [[maybe_unused]] if arg might be used (#2033) 
* refactor: [[maybe_unused]] iff arg _might_ be used

If the arg is never used, comment out its name.
If the arg is _sometimes_ used e.g. with ifdefs, use [[maybe_unused]].
2021-10-24 11:41:54 -05:00

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/*
* This file Copyright (C) 2013-2017 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#include <ctype.h> /* isalpha() */
#include <shlobj.h> /* SHCreateDirectoryEx() */
#include <winioctl.h> /* FSCTL_SET_SPARSE */
#include "transmission.h"
#include "crypto-utils.h" /* tr_rand_int() */
#include "error.h"
#include "file.h"
#include "tr-assert.h"
#include "utils.h"
#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
{
wchar_t* pattern;
HANDLE find_handle;
WIN32_FIND_DATAW find_data;
char* utf8_name;
};
static wchar_t const native_local_path_prefix[] = { '\\', '\\', '?', '\\' };
static wchar_t const native_unc_path_prefix[] = { '\\', '\\', '?', '\\', 'U', 'N', 'C', '\\' };
static void set_system_error(tr_error** error, DWORD code)
{
char* message;
if (error == nullptr)
{
return;
}
message = tr_win32_format_message(code);
if (message != nullptr)
{
tr_error_set_literal(error, code, message);
tr_free(message);
}
else
{
tr_error_set(error, code, "Unknown error: 0x%08lx", code);
}
}
static 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);
}
}
static time_t filetime_to_unix_time(FILETIME const* t)
{
TR_ASSERT(t != nullptr);
uint64_t tmp = 0;
tmp |= t->dwHighDateTime;
tmp <<= 32;
tmp |= t->dwLowDateTime;
tmp /= 10; /* to microseconds */
tmp -= DELTA_EPOCH_IN_MICROSECS;
return tmp / 1000000UL;
}
static void stat_to_sys_path_info(
DWORD attributes,
DWORD size_low,
DWORD size_high,
FILETIME const* mtime,
tr_sys_path_info* info)
{
TR_ASSERT(mtime != nullptr);
TR_ASSERT(info != nullptr);
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);
}
static constexpr bool is_slash(char c)
{
return c == '\\' || c == '/';
}
static constexpr bool is_unc_path(char const* path)
{
return is_slash(path[0]) && path[1] == path[0];
}
static bool is_valid_path(char const* path)
{
if (is_unc_path(path))
{
if (path[2] != '\0' && !isalnum(path[2]))
{
return false;
}
}
else
{
char const* colon_pos = strchr(path, ':');
if (colon_pos != nullptr)
{
if (colon_pos != path + 1 || !isalpha(path[0]))
{
return false;
}
path += 2;
}
}
return strpbrk(path, "<>:\"|?*") == nullptr;
}
static wchar_t* path_to_native_path_ex(char const* path, int extra_chars_after, int* real_result_size)
{
/* 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 */
bool const is_relative = tr_sys_path_is_relative(path);
bool const is_unc = is_unc_path(path);
/* `-2` for UNC since we overwrite existing prefix slashes */
int const extra_chars_before = is_relative ?
0 :
(is_unc ? TR_N_ELEMENTS(native_unc_path_prefix) - 2 : TR_N_ELEMENTS(native_local_path_prefix));
/* TODO (?): TR_ASSERT(!is_relative); */
wchar_t* const wide_path = tr_win32_utf8_to_native_ex(path, -1, extra_chars_before, extra_chars_after, real_result_size);
if (wide_path == nullptr)
{
return nullptr;
}
/* Relative paths cannot be used with "\\?\" prefixes. This also means that relative paths are
limited to ~260 chars... but we should rarely work with relative paths in the first place */
if (!is_relative)
{
if (is_unc)
{
/* UNC path: "\\server\share" -> "\\?\UNC\server\share" */
memcpy(wide_path, native_unc_path_prefix, sizeof(native_unc_path_prefix));
}
else
{
/* Local path: "C:" -> "\\?\C:" */
memcpy(wide_path, native_local_path_prefix, sizeof(native_local_path_prefix));
}
}
/* Automatic '/' to '\' conversion is disabled for "\\?\"-prefixed paths */
wchar_t* p = wide_path + extra_chars_before;
while ((p = wcschr(p, L'/')) != nullptr)
{
*p++ = L'\\';
}
if (real_result_size != nullptr)
{
*real_result_size += extra_chars_before;
}
return wide_path;
}
static wchar_t* path_to_native_path(char const* path)
{
return path_to_native_path_ex(path, 0, nullptr);
}
static char* native_path_to_path(wchar_t const* wide_path)
{
if (wide_path == nullptr)
{
return nullptr;
}
bool const is_unc = wcsncmp(wide_path, native_unc_path_prefix, TR_N_ELEMENTS(native_unc_path_prefix)) == 0;
bool const is_local = !is_unc && wcsncmp(wide_path, native_local_path_prefix, TR_N_ELEMENTS(native_local_path_prefix)) == 0;
size_t const skip_chars = is_unc ? TR_N_ELEMENTS(native_unc_path_prefix) :
(is_local ? TR_N_ELEMENTS(native_local_path_prefix) : 0);
char* const path = tr_win32_native_to_utf8_ex(wide_path + skip_chars, -1, is_unc ? 2 : 0, 0, nullptr);
if (is_unc && path != nullptr)
{
path[0] = '\\';
path[1] = '\\';
}
return path;
}
static tr_sys_file_t open_file(char const* path, DWORD access, DWORD disposition, DWORD flags, tr_error** error)
{
TR_ASSERT(path != nullptr);
tr_sys_file_t ret = TR_BAD_SYS_FILE;
wchar_t* wide_path = path_to_native_path(path);
if (wide_path != nullptr)
{
ret = CreateFileW(
wide_path,
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());
}
tr_free(wide_path);
return ret;
}
static bool create_dir(char const* path, int flags, int /*permissions*/, bool okay_if_exists, tr_error** error)
{
TR_ASSERT(path != nullptr);
bool ret;
DWORD error_code = ERROR_SUCCESS;
wchar_t* wide_path = path_to_native_path(path);
if ((flags & TR_SYS_DIR_CREATE_PARENTS) != 0)
{
error_code = SHCreateDirectoryExW(nullptr, wide_path, nullptr);
ret = error_code == ERROR_SUCCESS;
}
else
{
ret = CreateDirectoryW(wide_path, nullptr);
if (!ret)
{
error_code = GetLastError();
}
}
if (!ret && error_code == ERROR_ALREADY_EXISTS && okay_if_exists)
{
DWORD const attributes = GetFileAttributesW(wide_path);
if (attributes != INVALID_FILE_ATTRIBUTES && (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
ret = true;
}
}
if (!ret)
{
set_system_error(error, error_code);
}
tr_free(wide_path);
return ret;
}
static 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);
char* path = tr_strdup(path_template);
size_t path_size = strlen(path);
TR_ASSERT(path_size > 0);
tr_error* my_error = nullptr;
for (int attempt = 0; attempt < 100; ++attempt)
{
size_t i = path_size;
while (i > 0 && path_template[i - 1] == 'X')
{
int const c = tr_rand_int(26 + 26 + 10);
path[i - 1] = c < 26 ? c + 'A' : (c < 26 + 26 ? (c - 26) + 'a' : (c - 26 - 26) + '0');
--i;
}
TR_ASSERT(path_size >= i + 6);
tr_error_clear(&my_error);
(*callback)(path, callback_param, &my_error);
if (my_error == nullptr)
{
break;
}
}
if (my_error != nullptr)
{
tr_error_propagate(error, &my_error);
}
else
{
memcpy(path_template, path, path_size);
}
tr_free(path);
}
bool tr_sys_path_exists(char const* path, tr_error** error)
{
TR_ASSERT(path != nullptr);
bool ret = false;
HANDLE handle = INVALID_HANDLE_VALUE;
wchar_t* wide_path = path_to_native_path(path);
if (wide_path != nullptr)
{
DWORD attributes = GetFileAttributesW(wide_path);
if (attributes != INVALID_FILE_ATTRIBUTES)
{
if ((attributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0)
{
handle = CreateFileW(wide_path, 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);
}
tr_free(wide_path);
return ret;
}
bool tr_sys_path_get_info(char const* path, int flags, tr_sys_path_info* info, tr_error** error)
{
TR_ASSERT(path != nullptr);
TR_ASSERT(info != nullptr);
bool ret = false;
wchar_t* wide_path = path_to_native_path(path);
if ((flags & TR_SYS_PATH_NO_FOLLOW) == 0)
{
HANDLE handle = INVALID_HANDLE_VALUE;
if (wide_path != nullptr)
{
handle = CreateFileW(wide_path, 0, 0, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
}
if (handle != INVALID_HANDLE_VALUE)
{
tr_error* my_error = nullptr;
ret = tr_sys_file_get_info(handle, info, &my_error);
if (!ret)
{
tr_error_propagate(error, &my_error);
}
CloseHandle(handle);
}
else
{
set_system_error(error, GetLastError());
}
}
else
{
WIN32_FILE_ATTRIBUTE_DATA attributes;
if (wide_path != nullptr)
{
ret = GetFileAttributesExW(wide_path, GetFileExInfoStandard, &attributes);
}
if (ret)
{
stat_to_sys_path_info(
attributes.dwFileAttributes,
attributes.nFileSizeLow,
attributes.nFileSizeHigh,
&attributes.ftLastWriteTime,
info);
}
else
{
set_system_error(error, GetLastError());
}
}
tr_free(wide_path);
return ret;
}
bool tr_sys_path_is_relative(char const* path)
{
TR_ASSERT(path != nullptr);
/* UNC path: `\\...`. */
if (is_unc_path(path))
{
return false;
}
/* Local path: `X:` or `X:\...`. */
if (isalpha(path[0]) && path[1] == ':' && (path[2] == '\0' || 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);
bool ret = false;
wchar_t* wide_path1 = nullptr;
wchar_t* wide_path2 = nullptr;
HANDLE handle1 = INVALID_HANDLE_VALUE;
HANDLE handle2 = INVALID_HANDLE_VALUE;
BY_HANDLE_FILE_INFORMATION fi1, fi2;
wide_path1 = path_to_native_path(path1);
if (wide_path1 == nullptr)
{
goto fail;
}
wide_path2 = path_to_native_path(path2);
if (wide_path2 == nullptr)
{
goto fail;
}
handle1 = CreateFileW(wide_path1, 0, 0, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
if (handle1 == INVALID_HANDLE_VALUE)
{
goto fail;
}
handle2 = CreateFileW(wide_path2, 0, 0, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
if (handle2 == INVALID_HANDLE_VALUE)
{
goto fail;
}
/* TODO: Use GetFileInformationByHandleEx on >= Server 2012 */
if (!GetFileInformationByHandle(handle1, &fi1) || !GetFileInformationByHandle(handle2, &fi2))
{
goto fail;
}
ret = fi1.dwVolumeSerialNumber == fi2.dwVolumeSerialNumber && fi1.nFileIndexHigh == fi2.nFileIndexHigh &&
fi1.nFileIndexLow == fi2.nFileIndexLow;
goto cleanup;
fail:
set_system_error_if_file_found(error, GetLastError());
cleanup:
CloseHandle(handle2);
CloseHandle(handle1);
tr_free(wide_path2);
tr_free(wide_path1);
return ret;
}
char* tr_sys_path_resolve(char const* path, tr_error** error)
{
TR_ASSERT(path != nullptr);
char* ret = nullptr;
wchar_t* wide_path;
wchar_t* wide_ret = nullptr;
HANDLE handle = INVALID_HANDLE_VALUE;
DWORD wide_ret_size;
wide_path = path_to_native_path(path);
if (wide_path == nullptr)
{
goto fail;
}
handle = CreateFileW(
wide_path,
FILE_READ_EA,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
nullptr,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
nullptr);
if (handle == INVALID_HANDLE_VALUE)
{
goto fail;
}
wide_ret_size = GetFinalPathNameByHandleW(handle, nullptr, 0, 0);
if (wide_ret_size == 0)
{
goto fail;
}
wide_ret = tr_new(wchar_t, wide_ret_size);
if (GetFinalPathNameByHandleW(handle, wide_ret, wide_ret_size, 0) != wide_ret_size - 1)
{
goto fail;
}
TR_ASSERT(wcsncmp(wide_ret, L"\\\\?\\", 4) == 0);
ret = native_path_to_path(wide_ret);
if (ret != nullptr)
{
goto cleanup;
}
fail:
set_system_error(error, GetLastError());
tr_free(ret);
ret = nullptr;
cleanup:
tr_free(wide_ret);
tr_free(wide_path);
if (handle != INVALID_HANDLE_VALUE)
{
CloseHandle(handle);
}
return ret;
}
char* tr_sys_path_basename(char const* path, tr_error** error)
{
if (tr_str_is_empty(path))
{
return tr_strdup(".");
}
if (!is_valid_path(path))
{
set_system_error(error, ERROR_PATH_NOT_FOUND);
return nullptr;
}
char const* end = path + strlen(path);
while (end > path && is_slash(*(end - 1)))
{
--end;
}
if (end == path)
{
return tr_strdup("/");
}
char const* name = end;
while (name > path && *(name - 1) != ':' && !is_slash(*(name - 1)))
{
--name;
}
if (name == end)
{
return tr_strdup("/");
}
return tr_strndup(name, end - name);
}
char* tr_sys_path_dirname(char const* path, tr_error** error)
{
if (tr_str_is_empty(path))
{
return tr_strdup(".");
}
if (!is_valid_path(path))
{
set_system_error(error, ERROR_PATH_NOT_FOUND);
return nullptr;
}
bool const is_unc = is_unc_path(path);
if (is_unc && path[2] == '\0')
{
return tr_strdup(path);
}
char const* end = path + strlen(path);
while (end > path && is_slash(*(end - 1)))
{
--end;
}
if (end == path)
{
return tr_strdup("/");
}
char const* name = end;
while (name > path && *(name - 1) != ':' && !is_slash(*(name - 1)))
{
--name;
}
while (name > path && is_slash(*(name - 1)))
{
--name;
}
if (name == path)
{
return tr_strdup(is_unc ? "\\\\" : ".");
}
if (name > path && *(name - 1) == ':' && *name != '\0' && !is_slash(*name))
{
return tr_strdup_printf("%c:.", path[0]);
}
return tr_strndup(path, name - path);
}
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;
wchar_t* wide_src_path = path_to_native_path(src_path);
wchar_t* wide_dst_path = path_to_native_path(dst_path);
if (wide_src_path != nullptr && wide_dst_path != nullptr)
{
DWORD flags = MOVEFILE_REPLACE_EXISTING;
DWORD attributes;
attributes = GetFileAttributesW(wide_src_path);
if (attributes != INVALID_FILE_ATTRIBUTES && (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
flags = 0;
}
else
{
attributes = GetFileAttributesW(wide_dst_path);
if (attributes != INVALID_FILE_ATTRIBUTES && (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
flags = 0;
}
}
ret = MoveFileExW(wide_src_path, wide_dst_path, flags);
}
if (!ret)
{
set_system_error(error, GetLastError());
}
tr_free(wide_dst_path);
tr_free(wide_src_path);
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);
bool ret = false;
wchar_t* wide_src_path = path_to_native_path(src_path);
wchar_t* wide_dst_path = path_to_native_path(dst_path);
if (wide_src_path == nullptr || wide_dst_path == nullptr)
{
set_system_error(error, ERROR_INVALID_PARAMETER);
goto out;
}
auto cancel = BOOL{ FALSE };
DWORD const flags = COPY_FILE_ALLOW_DECRYPTED_DESTINATION | COPY_FILE_FAIL_IF_EXISTS;
if (CopyFileExW(wide_src_path, wide_dst_path, nullptr, nullptr, &cancel, flags) == 0)
{
set_system_error(error, GetLastError());
goto out;
}
else
{
ret = true;
}
out:
tr_free(wide_src_path);
tr_free(wide_dst_path);
return ret;
}
bool tr_sys_path_remove(char const* path, tr_error** error)
{
TR_ASSERT(path != nullptr);
bool ret = false;
wchar_t* wide_path = path_to_native_path(path);
if (wide_path != nullptr)
{
DWORD const attributes = GetFileAttributesW(wide_path);
if (attributes != INVALID_FILE_ATTRIBUTES)
{
if ((attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
ret = RemoveDirectoryW(wide_path);
}
else
{
ret = DeleteFileW(wide_path);
}
}
}
if (!ret)
{
set_system_error(error, GetLastError());
}
tr_free(wide_path);
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_get_std(tr_std_sys_file_t std_file, tr_error** error)
{
tr_sys_file_t ret = TR_BAD_SYS_FILE;
switch (std_file)
{
case TR_STD_SYS_FILE_IN:
ret = GetStdHandle(STD_INPUT_HANDLE);
break;
case TR_STD_SYS_FILE_OUT:
ret = GetStdHandle(STD_OUTPUT_HANDLE);
break;
case TR_STD_SYS_FILE_ERR:
ret = GetStdHandle(STD_ERROR_HANDLE);
break;
default:
TR_ASSERT_MSG(false, "unknown standard file %d", (int)std_file);
set_system_error(error, ERROR_INVALID_PARAMETER);
return TR_BAD_SYS_FILE;
}
if (ret == TR_BAD_SYS_FILE)
{
set_system_error(error, GetLastError());
}
else if (ret == nullptr)
{
ret = TR_BAD_SYS_FILE;
}
return ret;
}
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_NEW) != 0)
{
native_disposition = CREATE_NEW;
}
else 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)
{
if (error == nullptr)
{
set_system_error(error, GetLastError());
}
CloseHandle(ret);
ret = TR_BAD_SYS_FILE;
}
return ret;
}
static void file_open_temp_callback(char const* path, void* param, tr_error** error)
{
tr_sys_file_t* result = (tr_sys_file_t*)param;
TR_ASSERT(result != nullptr);
*result = open_file(path, GENERIC_READ | GENERIC_WRITE, CREATE_NEW, FILE_ATTRIBUTE_TEMPORARY, error);
}
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_get_info(tr_sys_file_t handle, tr_sys_path_info* info, tr_error** error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
TR_ASSERT(info != nullptr);
BY_HANDLE_FILE_INFORMATION attributes;
bool ret = GetFileInformationByHandle(handle, &attributes);
if (ret)
{
stat_to_sys_path_info(
attributes.dwFileAttributes,
attributes.nFileSizeLow,
attributes.nFileSizeHigh,
&attributes.ftLastWriteTime,
info);
}
else
{
set_system_error(error, GetLastError());
}
return ret;
}
bool tr_sys_file_seek(tr_sys_file_t handle, int64_t offset, tr_seek_origin_t origin, uint64_t* new_offset, tr_error** error)
{
static_assert(TR_SEEK_SET == FILE_BEGIN, "values should match");
static_assert(TR_SEEK_CUR == FILE_CURRENT, "values should match");
static_assert(TR_SEEK_END == FILE_END, "values should match");
TR_ASSERT(handle != TR_BAD_SYS_FILE);
TR_ASSERT(origin == TR_SEEK_SET || origin == TR_SEEK_CUR || origin == TR_SEEK_END);
bool ret = false;
LARGE_INTEGER native_offset;
LARGE_INTEGER new_native_pointer;
native_offset.QuadPart = offset;
if (SetFilePointerEx(handle, native_offset, &new_native_pointer, origin))
{
if (new_offset != nullptr)
{
*new_offset = new_native_pointer.QuadPart;
}
ret = true;
}
else
{
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_flush(tr_sys_file_t handle, tr_error** error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
bool ret = FlushFileBuffers(handle);
if (!ret)
{
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_advise(
[[maybe_unused]] tr_sys_file_t handle,
uint64_t /*offset*/,
[[maybe_unused]] uint64_t size,
[[maybe_unused]] tr_sys_file_advice_t advice,
tr_error** /*error*/)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
TR_ASSERT(size > 0);
TR_ASSERT(advice == TR_SYS_FILE_ADVICE_WILL_NEED || advice == TR_SYS_FILE_ADVICE_DONT_NEED);
bool ret = true;
/* ??? */
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);
}
void* tr_sys_file_map_for_reading(tr_sys_file_t handle, uint64_t offset, uint64_t size, tr_error** error)
{
TR_ASSERT(handle != TR_BAD_SYS_FILE);
TR_ASSERT(size > 0);
if (size > MAXSIZE_T)
{
set_system_error(error, ERROR_INVALID_PARAMETER);
return false;
}
void* ret = nullptr;
HANDLE mappingHandle = CreateFileMappingW(handle, nullptr, PAGE_READONLY, 0, 0, nullptr);
if (mappingHandle != nullptr)
{
ULARGE_INTEGER native_offset;
native_offset.QuadPart = offset;
ret = MapViewOfFile(mappingHandle, FILE_MAP_READ, native_offset.u.HighPart, native_offset.u.LowPart, (SIZE_T)size);
}
if (ret == nullptr)
{
set_system_error(error, GetLastError());
}
CloseHandle(mappingHandle);
return ret;
}
bool tr_sys_file_unmap(void const* address, [[maybe_unused]] uint64_t size, tr_error** error)
{
TR_ASSERT(address != nullptr);
TR_ASSERT(size > 0);
bool ret = UnmapViewOfFile(address);
if (!ret)
{
set_system_error(error, GetLastError());
}
return ret;
}
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;
}
char* tr_sys_dir_get_current(tr_error** error)
{
char* ret = nullptr;
wchar_t* wide_ret = nullptr;
DWORD size;
size = GetCurrentDirectoryW(0, nullptr);
if (size != 0)
{
wide_ret = tr_new(wchar_t, size);
if (GetCurrentDirectoryW(size, wide_ret) != 0)
{
ret = tr_win32_native_to_utf8(wide_ret, size);
}
}
if (ret == nullptr)
{
set_system_error(error, GetLastError());
}
tr_free(wide_ret);
return ret;
}
bool tr_sys_dir_create(char const* path, int flags, int permissions, tr_error** error)
{
return create_dir(path, flags, permissions, true, error);
}
static void dir_create_temp_callback(char const* path, void* param, tr_error** error)
{
bool* result = (bool*)param;
TR_ASSERT(result != nullptr);
*result = create_dir(path, 0, 0, false, 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(char const* path, tr_error** error)
{
#ifndef __clang__
/* Clang gives "static_assert expression is not an integral constant expression" error */
static_assert(TR_BAD_SYS_DIR == nullptr, "values should match");
#endif
TR_ASSERT(path != nullptr);
tr_sys_dir_t ret = tr_new(struct tr_sys_dir_win32, 1);
int pattern_size;
ret->pattern = path_to_native_path_ex(path, 2, &pattern_size);
if (ret->pattern != nullptr)
{
ret->pattern[pattern_size + 0] = L'\\';
ret->pattern[pattern_size + 1] = L'*';
ret->find_handle = INVALID_HANDLE_VALUE;
ret->utf8_name = nullptr;
}
else
{
set_system_error(error, GetLastError());
tr_free(ret->pattern);
tr_free(ret);
ret = nullptr;
}
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, &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;
}
char* ret = tr_win32_native_to_utf8(handle->find_data.cFileName, -1);
if (ret != nullptr)
{
tr_free(handle->utf8_name);
handle->utf8_name = ret;
}
else
{
set_system_error(error, GetLastError());
}
return ret;
}
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());
}
tr_free(handle->utf8_name);
tr_free(handle->pattern);
tr_free(handle);
return ret;
}
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