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fs.c
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fs.c
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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <assert.h>
#include <stdlib.h>
#include <direct.h>
#include <errno.h>
#include <fcntl.h>
#include <io.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/utime.h>
#include <stdio.h>
#include "uv.h"
#include "internal.h"
#include "req-inl.h"
#include "handle-inl.h"
#include <wincrypt.h>
#define UV_FS_FREE_PATHS 0x0002
#define UV_FS_FREE_PTR 0x0008
#define UV_FS_CLEANEDUP 0x0010
#define QUEUE_FS_TP_JOB(loop, req) \
do { \
uv__req_register(loop, req); \
uv__work_submit((loop), &(req)->work_req, uv__fs_work, uv__fs_done); \
} while (0)
#define SET_REQ_RESULT(req, result_value) \
do { \
req->result = (result_value); \
if (req->result == -1) { \
req->sys_errno_ = _doserrno; \
req->result = uv_translate_sys_error(req->sys_errno_); \
} \
} while (0)
#define SET_REQ_WIN32_ERROR(req, sys_errno) \
do { \
req->sys_errno_ = (sys_errno); \
req->result = uv_translate_sys_error(req->sys_errno_); \
} while (0)
#define SET_REQ_UV_ERROR(req, uv_errno, sys_errno) \
do { \
req->result = (uv_errno); \
req->sys_errno_ = (sys_errno); \
} while (0)
#define VERIFY_FD(fd, req) \
if (fd == -1) { \
req->result = UV_EBADF; \
req->sys_errno_ = ERROR_INVALID_HANDLE; \
return; \
}
#define FILETIME_TO_UINT(filetime) \
(*((uint64_t*) &(filetime)) - 116444736000000000ULL)
#define FILETIME_TO_TIME_T(filetime) \
(FILETIME_TO_UINT(filetime) / 10000000ULL)
#define FILETIME_TO_TIME_NS(filetime, secs) \
((FILETIME_TO_UINT(filetime) - (secs * 10000000ULL)) * 100)
#define FILETIME_TO_TIMESPEC(ts, filetime) \
do { \
(ts).tv_sec = (long) FILETIME_TO_TIME_T(filetime); \
(ts).tv_nsec = (long) FILETIME_TO_TIME_NS(filetime, (ts).tv_sec); \
} while(0)
#define TIME_T_TO_FILETIME(time, filetime_ptr) \
do { \
uint64_t bigtime = ((int64_t) (time) * 10000000LL) + \
116444736000000000ULL; \
(filetime_ptr)->dwLowDateTime = bigtime & 0xFFFFFFFF; \
(filetime_ptr)->dwHighDateTime = bigtime >> 32; \
} while(0)
#define IS_SLASH(c) ((c) == L'\\' || (c) == L'/')
#define IS_LETTER(c) (((c) >= L'a' && (c) <= L'z') || \
((c) >= L'A' && (c) <= L'Z'))
const WCHAR JUNCTION_PREFIX[] = L"\\??\\";
const WCHAR JUNCTION_PREFIX_LEN = 4;
const WCHAR LONG_PATH_PREFIX[] = L"\\\\?\\";
const WCHAR LONG_PATH_PREFIX_LEN = 4;
void uv_fs_init() {
_fmode = _O_BINARY;
}
INLINE static int fs__capture_path(uv_loop_t* loop, uv_fs_t* req,
const char* path, const char* new_path, const int copy_path) {
char* buf;
char* pos;
ssize_t buf_sz = 0, path_len, pathw_len = 0, new_pathw_len = 0;
/* new_path can only be set if path is also set. */
assert(new_path == NULL || path != NULL);
if (path != NULL) {
pathw_len = MultiByteToWideChar(CP_UTF8,
0,
path,
-1,
NULL,
0);
if (pathw_len == 0) {
return GetLastError();
}
buf_sz += pathw_len * sizeof(WCHAR);
}
if (path != NULL && copy_path) {
path_len = 1 + strlen(path);
buf_sz += path_len;
}
if (new_path != NULL) {
new_pathw_len = MultiByteToWideChar(CP_UTF8,
0,
new_path,
-1,
NULL,
0);
if (new_pathw_len == 0) {
return GetLastError();
}
buf_sz += new_pathw_len * sizeof(WCHAR);
}
if (buf_sz == 0) {
req->file.pathw = NULL;
req->fs.info.new_pathw = NULL;
req->path = NULL;
return 0;
}
buf = (char*) malloc(buf_sz);
if (buf == NULL) {
return ERROR_OUTOFMEMORY;
}
pos = buf;
if (path != NULL) {
DWORD r = MultiByteToWideChar(CP_UTF8,
0,
path,
-1,
(WCHAR*) pos,
pathw_len);
assert(r == (DWORD) pathw_len);
req->file.pathw = (WCHAR*) pos;
pos += r * sizeof(WCHAR);
} else {
req->file.pathw = NULL;
}
if (new_path != NULL) {
DWORD r = MultiByteToWideChar(CP_UTF8,
0,
new_path,
-1,
(WCHAR*) pos,
new_pathw_len);
assert(r == (DWORD) new_pathw_len);
req->fs.info.new_pathw = (WCHAR*) pos;
pos += r * sizeof(WCHAR);
} else {
req->fs.info.new_pathw = NULL;
}
if (!copy_path) {
req->path = path;
} else if (path) {
memcpy(pos, path, path_len);
assert(path_len == buf_sz - (pos - buf));
req->path = pos;
} else {
req->path = NULL;
}
req->flags |= UV_FS_FREE_PATHS;
return 0;
}
INLINE static void uv_fs_req_init(uv_loop_t* loop, uv_fs_t* req,
uv_fs_type fs_type, const uv_fs_cb cb) {
uv_req_init(loop, (uv_req_t*) req);
req->type = UV_FS;
req->loop = loop;
req->flags = 0;
req->fs_type = fs_type;
req->result = 0;
req->ptr = NULL;
req->path = NULL;
req->cb = cb;
}
INLINE static int fs__readlink_handle(HANDLE handle, char** target_ptr,
uint64_t* target_len_ptr) {
char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
REPARSE_DATA_BUFFER* reparse_data = (REPARSE_DATA_BUFFER*) buffer;
WCHAR *w_target;
DWORD w_target_len;
char* target;
int target_len;
DWORD bytes;
if (!DeviceIoControl(handle,
FSCTL_GET_REPARSE_POINT,
NULL,
0,
buffer,
sizeof buffer,
&bytes,
NULL)) {
return -1;
}
if (reparse_data->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
/* Real symlink */
w_target = reparse_data->SymbolicLinkReparseBuffer.PathBuffer +
(reparse_data->SymbolicLinkReparseBuffer.SubstituteNameOffset /
sizeof(WCHAR));
w_target_len =
reparse_data->SymbolicLinkReparseBuffer.SubstituteNameLength /
sizeof(WCHAR);
/* Real symlinks can contain pretty much everything, but the only thing */
/* we really care about is undoing the implicit conversion to an NT */
/* namespaced path that CreateSymbolicLink will perform on absolute */
/* paths. If the path is win32-namespaced then the user must have */
/* explicitly made it so, and we better just return the unmodified */
/* reparse data. */
if (w_target_len >= 4 &&
w_target[0] == L'\\' &&
w_target[1] == L'?' &&
w_target[2] == L'?' &&
w_target[3] == L'\\') {
/* Starts with \??\ */
if (w_target_len >= 6 &&
((w_target[4] >= L'A' && w_target[4] <= L'Z') ||
(w_target[4] >= L'a' && w_target[4] <= L'z')) &&
w_target[5] == L':' &&
(w_target_len == 6 || w_target[6] == L'\\')) {
/* \??\<drive>:\ */
w_target += 4;
w_target_len -= 4;
} else if (w_target_len >= 8 &&
(w_target[4] == L'U' || w_target[4] == L'u') &&
(w_target[5] == L'N' || w_target[5] == L'n') &&
(w_target[6] == L'C' || w_target[6] == L'c') &&
w_target[7] == L'\\') {
/* \??\UNC\<server>\<share>\ - make sure the final path looks like */
/* \\<server>\<share>\ */
w_target += 6;
w_target[0] = L'\\';
w_target_len -= 6;
}
}
} else if (reparse_data->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) {
/* Junction. */
w_target = reparse_data->MountPointReparseBuffer.PathBuffer +
(reparse_data->MountPointReparseBuffer.SubstituteNameOffset /
sizeof(WCHAR));
w_target_len = reparse_data->MountPointReparseBuffer.SubstituteNameLength /
sizeof(WCHAR);
/* Only treat junctions that look like \??\<drive>:\ as symlink. */
/* Junctions can also be used as mount points, like \??\Volume{<guid>}, */
/* but that's confusing for programs since they wouldn't be able to */
/* actually understand such a path when returned by uv_readlink(). */
/* UNC paths are never valid for junctions so we don't care about them. */
if (!(w_target_len >= 6 &&
w_target[0] == L'\\' &&
w_target[1] == L'?' &&
w_target[2] == L'?' &&
w_target[3] == L'\\' &&
((w_target[4] >= L'A' && w_target[4] <= L'Z') ||
(w_target[4] >= L'a' && w_target[4] <= L'z')) &&
w_target[5] == L':' &&
(w_target_len == 6 || w_target[6] == L'\\'))) {
SetLastError(ERROR_SYMLINK_NOT_SUPPORTED);
return -1;
}
/* Remove leading \??\ */
w_target += 4;
w_target_len -= 4;
} else {
/* Reparse tag does not indicate a symlink. */
SetLastError(ERROR_SYMLINK_NOT_SUPPORTED);
return -1;
}
/* If needed, compute the length of the target. */
if (target_ptr != NULL || target_len_ptr != NULL) {
/* Compute the length of the target. */
target_len = WideCharToMultiByte(CP_UTF8,
0,
w_target,
w_target_len,
NULL,
0,
NULL,
NULL);
if (target_len == 0) {
return -1;
}
}
/* If requested, allocate memory and convert to UTF8. */
if (target_ptr != NULL) {
int r;
target = (char*) malloc(target_len + 1);
if (target == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
return -1;
}
r = WideCharToMultiByte(CP_UTF8,
0,
w_target,
w_target_len,
target,
target_len,
NULL,
NULL);
assert(r == target_len);
target[target_len] = '\0';
*target_ptr = target;
}
if (target_len_ptr != NULL) {
*target_len_ptr = target_len;
}
return 0;
}
void fs__open(uv_fs_t* req) {
DWORD access;
DWORD share;
DWORD disposition;
DWORD attributes = 0;
HANDLE file;
int fd, current_umask;
int flags = req->fs.info.file_flags;
/* Obtain the active umask. umask() never fails and returns the previous */
/* umask. */
current_umask = umask(0);
umask(current_umask);
/* convert flags and mode to CreateFile parameters */
switch (flags & (_O_RDONLY | _O_WRONLY | _O_RDWR)) {
case _O_RDONLY:
access = FILE_GENERIC_READ;
attributes |= FILE_FLAG_BACKUP_SEMANTICS;
break;
case _O_WRONLY:
access = FILE_GENERIC_WRITE;
break;
case _O_RDWR:
access = FILE_GENERIC_READ | FILE_GENERIC_WRITE;
break;
default:
goto einval;
}
if (flags & _O_APPEND) {
access &= ~FILE_WRITE_DATA;
access |= FILE_APPEND_DATA;
attributes &= ~FILE_FLAG_BACKUP_SEMANTICS;
}
/*
* Here is where we deviate significantly from what CRT's _open()
* does. We indiscriminately use all the sharing modes, to match
* UNIX semantics. In particular, this ensures that the file can
* be deleted even whilst it's open, fixing issue #1449.
*/
share = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
switch (flags & (_O_CREAT | _O_EXCL | _O_TRUNC)) {
case 0:
case _O_EXCL:
disposition = OPEN_EXISTING;
break;
case _O_CREAT:
disposition = OPEN_ALWAYS;
break;
case _O_CREAT | _O_EXCL:
case _O_CREAT | _O_TRUNC | _O_EXCL:
disposition = CREATE_NEW;
break;
case _O_TRUNC:
case _O_TRUNC | _O_EXCL:
disposition = TRUNCATE_EXISTING;
break;
case _O_CREAT | _O_TRUNC:
disposition = CREATE_ALWAYS;
break;
default:
goto einval;
}
attributes |= FILE_ATTRIBUTE_NORMAL;
if (flags & _O_CREAT) {
if (!((req->fs.info.mode & ~current_umask) & _S_IWRITE)) {
attributes |= FILE_ATTRIBUTE_READONLY;
}
}
if (flags & _O_TEMPORARY ) {
attributes |= FILE_FLAG_DELETE_ON_CLOSE | FILE_ATTRIBUTE_TEMPORARY;
access |= DELETE;
}
if (flags & _O_SHORT_LIVED) {
attributes |= FILE_ATTRIBUTE_TEMPORARY;
}
switch (flags & (_O_SEQUENTIAL | _O_RANDOM)) {
case 0:
break;
case _O_SEQUENTIAL:
attributes |= FILE_FLAG_SEQUENTIAL_SCAN;
break;
case _O_RANDOM:
attributes |= FILE_FLAG_RANDOM_ACCESS;
break;
default:
goto einval;
}
/* Setting this flag makes it possible to open a directory. */
attributes |= FILE_FLAG_BACKUP_SEMANTICS;
file = CreateFileW(req->file.pathw,
access,
share,
NULL,
disposition,
attributes,
NULL);
if (file == INVALID_HANDLE_VALUE) {
DWORD error = GetLastError();
if (error == ERROR_FILE_EXISTS && (flags & _O_CREAT) &&
!(flags & _O_EXCL)) {
/* Special case: when ERROR_FILE_EXISTS happens and O_CREAT was */
/* specified, it means the path referred to a directory. */
SET_REQ_UV_ERROR(req, UV_EISDIR, error);
} else {
SET_REQ_WIN32_ERROR(req, GetLastError());
}
return;
}
fd = _open_osfhandle((intptr_t) file, flags);
if (fd < 0) {
/* The only known failure mode for _open_osfhandle() is EMFILE, in which
* case GetLastError() will return zero. However we'll try to handle other
* errors as well, should they ever occur.
*/
if (errno == EMFILE)
SET_REQ_UV_ERROR(req, UV_EMFILE, ERROR_TOO_MANY_OPEN_FILES);
else if (GetLastError() != ERROR_SUCCESS)
SET_REQ_WIN32_ERROR(req, GetLastError());
else
SET_REQ_WIN32_ERROR(req, UV_UNKNOWN);
CloseHandle(file);
return;
}
SET_REQ_RESULT(req, fd);
return;
einval:
SET_REQ_UV_ERROR(req, UV_EINVAL, ERROR_INVALID_PARAMETER);
}
void fs__close(uv_fs_t* req) {
int fd = req->file.fd;
int result;
VERIFY_FD(fd, req);
result = _close(fd);
SET_REQ_RESULT(req, result);
}
void fs__read(uv_fs_t* req) {
int fd = req->file.fd;
int64_t offset = req->fs.info.offset;
HANDLE handle;
OVERLAPPED overlapped, *overlapped_ptr;
LARGE_INTEGER offset_;
DWORD bytes;
DWORD error;
int result;
unsigned int index;
VERIFY_FD(fd, req);
handle = uv__get_osfhandle(fd);
if (handle == INVALID_HANDLE_VALUE) {
SET_REQ_WIN32_ERROR(req, ERROR_INVALID_HANDLE);
return;
}
if (offset != -1) {
memset(&overlapped, 0, sizeof overlapped);
overlapped_ptr = &overlapped;
} else {
overlapped_ptr = NULL;
}
index = 0;
bytes = 0;
do {
DWORD incremental_bytes;
if (offset != -1) {
offset_.QuadPart = offset + bytes;
overlapped.Offset = offset_.LowPart;
overlapped.OffsetHigh = offset_.HighPart;
}
result = ReadFile(handle,
req->fs.info.bufs[index].base,
req->fs.info.bufs[index].len,
&incremental_bytes,
overlapped_ptr);
bytes += incremental_bytes;
++index;
} while (result && index < req->fs.info.nbufs);
if (result || bytes > 0) {
SET_REQ_RESULT(req, bytes);
} else {
error = GetLastError();
if (error == ERROR_HANDLE_EOF) {
SET_REQ_RESULT(req, bytes);
} else {
SET_REQ_WIN32_ERROR(req, error);
}
}
}
void fs__write(uv_fs_t* req) {
int fd = req->file.fd;
int64_t offset = req->fs.info.offset;
HANDLE handle;
OVERLAPPED overlapped, *overlapped_ptr;
LARGE_INTEGER offset_;
DWORD bytes;
int result;
unsigned int index;
VERIFY_FD(fd, req);
handle = uv__get_osfhandle(fd);
if (handle == INVALID_HANDLE_VALUE) {
SET_REQ_WIN32_ERROR(req, ERROR_INVALID_HANDLE);
return;
}
if (offset != -1) {
memset(&overlapped, 0, sizeof overlapped);
overlapped_ptr = &overlapped;
} else {
overlapped_ptr = NULL;
}
index = 0;
bytes = 0;
do {
DWORD incremental_bytes;
if (offset != -1) {
offset_.QuadPart = offset + bytes;
overlapped.Offset = offset_.LowPart;
overlapped.OffsetHigh = offset_.HighPart;
}
result = WriteFile(handle,
req->fs.info.bufs[index].base,
req->fs.info.bufs[index].len,
&incremental_bytes,
overlapped_ptr);
bytes += incremental_bytes;
++index;
} while (result && index < req->fs.info.nbufs);
if (result || bytes > 0) {
SET_REQ_RESULT(req, bytes);
} else {
SET_REQ_WIN32_ERROR(req, GetLastError());
}
}
void fs__rmdir(uv_fs_t* req) {
int result = _wrmdir(req->file.pathw);
SET_REQ_RESULT(req, result);
}
void fs__unlink(uv_fs_t* req) {
const WCHAR* pathw = req->file.pathw;
HANDLE handle;
BY_HANDLE_FILE_INFORMATION info;
FILE_DISPOSITION_INFORMATION disposition;
IO_STATUS_BLOCK iosb;
NTSTATUS status;
handle = CreateFileW(pathw,
FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | DELETE,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL,
OPEN_EXISTING,
FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS,
NULL);
if (handle == INVALID_HANDLE_VALUE) {
SET_REQ_WIN32_ERROR(req, GetLastError());
return;
}
if (!GetFileInformationByHandle(handle, &info)) {
SET_REQ_WIN32_ERROR(req, GetLastError());
CloseHandle(handle);
return;
}
if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
/* Do not allow deletion of directories, unless it is a symlink. When */
/* the path refers to a non-symlink directory, report EPERM as mandated */
/* by POSIX.1. */
/* Check if it is a reparse point. If it's not, it's a normal directory. */
if (!(info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
SET_REQ_WIN32_ERROR(req, ERROR_ACCESS_DENIED);
CloseHandle(handle);
return;
}
/* Read the reparse point and check if it is a valid symlink. */
/* If not, don't unlink. */
if (fs__readlink_handle(handle, NULL, NULL) < 0) {
DWORD error = GetLastError();
if (error == ERROR_SYMLINK_NOT_SUPPORTED)
error = ERROR_ACCESS_DENIED;
SET_REQ_WIN32_ERROR(req, error);
CloseHandle(handle);
return;
}
}
if (info.dwFileAttributes & FILE_ATTRIBUTE_READONLY) {
/* Remove read-only attribute */
FILE_BASIC_INFORMATION basic = { 0 };
basic.FileAttributes = info.dwFileAttributes & ~(FILE_ATTRIBUTE_READONLY);
status = pNtSetInformationFile(handle,
&iosb,
&basic,
sizeof basic,
FileBasicInformation);
if (!NT_SUCCESS(status)) {
SET_REQ_WIN32_ERROR(req, pRtlNtStatusToDosError(status));
CloseHandle(handle);
return;
}
}
/* Try to set the delete flag. */
disposition.DeleteFile = TRUE;
status = pNtSetInformationFile(handle,
&iosb,
&disposition,
sizeof disposition,
FileDispositionInformation);
if (NT_SUCCESS(status)) {
SET_REQ_SUCCESS(req);
} else {
SET_REQ_WIN32_ERROR(req, pRtlNtStatusToDosError(status));
}
CloseHandle(handle);
}
void fs__mkdir(uv_fs_t* req) {
/* TODO: use req->mode. */
int result = _wmkdir(req->file.pathw);
SET_REQ_RESULT(req, result);
}
/* OpenBSD original: lib/libc/stdio/mktemp.c */
void fs__mkdtemp(uv_fs_t* req) {
static const WCHAR *tempchars =
L"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
static const size_t num_chars = 62;
static const size_t num_x = 6;
WCHAR *cp, *ep;
unsigned int tries, i;
size_t len;
HCRYPTPROV h_crypt_prov;
uint64_t v;
BOOL released;
len = wcslen(req->file.pathw);
ep = req->file.pathw + len;
if (len < num_x || wcsncmp(ep - num_x, L"XXXXXX", num_x)) {
SET_REQ_UV_ERROR(req, UV_EINVAL, ERROR_INVALID_PARAMETER);
return;
}
if (!CryptAcquireContext(&h_crypt_prov, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT)) {
SET_REQ_WIN32_ERROR(req, GetLastError());
return;
}
tries = TMP_MAX;
do {
if (!CryptGenRandom(h_crypt_prov, sizeof(v), (BYTE*) &v)) {
SET_REQ_WIN32_ERROR(req, GetLastError());
break;
}
cp = ep - num_x;
for (i = 0; i < num_x; i++) {
*cp++ = tempchars[v % num_chars];
v /= num_chars;
}
if (_wmkdir(req->file.pathw) == 0) {
len = strlen(req->path);
wcstombs((char*) req->path + len - num_x, ep - num_x, num_x);
SET_REQ_RESULT(req, 0);
break;
} else if (errno != EEXIST) {
SET_REQ_RESULT(req, -1);
break;
}
} while (--tries);
released = CryptReleaseContext(h_crypt_prov, 0);
assert(released);
if (tries == 0) {
SET_REQ_RESULT(req, -1);
}
}
void fs__scandir(uv_fs_t* req) {
static const size_t dirents_initial_size = 32;
HANDLE dir_handle = INVALID_HANDLE_VALUE;
uv__dirent_t** dirents = NULL;
size_t dirents_size = 0;
size_t dirents_used = 0;
IO_STATUS_BLOCK iosb;
NTSTATUS status;
/* Buffer to hold directory entries returned by NtQueryDirectoryFile.
* It's important that this buffer can hold at least one entry, regardless
* of the length of the file names present in the enumerated directory.
* A file name is at most 256 WCHARs long.
* According to MSDN, the buffer must be aligned at an 8-byte boundary.
*/
__declspec(align(8)) char buffer[8192];
STATIC_ASSERT(sizeof buffer >=
sizeof(FILE_DIRECTORY_INFORMATION) + 256 * sizeof(WCHAR));
/* Open the directory. */
dir_handle =
CreateFileW(req->file.pathw,
FILE_LIST_DIRECTORY | SYNCHRONIZE,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
NULL);
if (dir_handle == INVALID_HANDLE_VALUE)
goto win32_error;
/* Read the first chunk. */
status = pNtQueryDirectoryFile(dir_handle,
NULL,
NULL,
NULL,
&iosb,
&buffer,
sizeof buffer,
FileDirectoryInformation,
FALSE,
NULL,
TRUE);
/* If the handle is not a directory, we'll get STATUS_INVALID_PARAMETER.
* This should be reported back as UV_ENOTDIR.
*/
if (status == STATUS_INVALID_PARAMETER)
goto not_a_directory_error;
while (NT_SUCCESS(status)) {
char* position = buffer;
size_t next_entry_offset = 0;
do {
FILE_DIRECTORY_INFORMATION* info;
uv__dirent_t* dirent;
size_t wchar_len;
size_t utf8_len;
/* Obtain a pointer to the current directory entry. */
position += next_entry_offset;
info = (FILE_DIRECTORY_INFORMATION*) position;
/* Fetch the offset to the next directory entry. */
next_entry_offset = info->NextEntryOffset;
/* Compute the length of the filename in WCHARs. */
wchar_len = info->FileNameLength / sizeof info->FileName[0];
/* Skip over '.' and '..' entries. */
if (wchar_len == 1 && info->FileName[0] == L'.')
continue;
if (wchar_len == 2 && info->FileName[0] == L'.' &&
info->FileName[1] == L'.')
continue;
/* Compute the space required to store the filename as UTF-8. */
utf8_len = WideCharToMultiByte(
CP_UTF8, 0, &info->FileName[0], wchar_len, NULL, 0, NULL, NULL);
if (utf8_len == 0)
goto win32_error;
/* Resize the dirent array if needed. */
if (dirents_used >= dirents_size) {
size_t new_dirents_size =
dirents_size == 0 ? dirents_initial_size : dirents_size << 1;
uv__dirent_t** new_dirents =
realloc(dirents, new_dirents_size * sizeof *dirents);
if (new_dirents == NULL)
goto out_of_memory_error;
dirents_size = new_dirents_size;
dirents = new_dirents;
}
/* Allocate space for the uv dirent structure. The dirent structure
* includes room for the first character of the filename, but `utf8_len`
* doesn't count the NULL terminator at this point.
*/
dirent = malloc(sizeof *dirent + utf8_len);
if (dirent == NULL)
goto out_of_memory_error;
dirents[dirents_used++] = dirent;
/* Convert file name to UTF-8. */
if (WideCharToMultiByte(CP_UTF8,
0,
&info->FileName[0],
wchar_len,
&dirent->d_name[0],
utf8_len,
NULL,
NULL) == 0)
goto win32_error;
/* Add a null terminator to the filename. */
dirent->d_name[utf8_len] = '\0';
/* Fill out the type field. */
if (info->FileAttributes & FILE_ATTRIBUTE_DEVICE)
dirent->d_type = UV__DT_CHAR;
else if (info->FileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
dirent->d_type = UV__DT_LINK;
else if (info->FileAttributes & FILE_ATTRIBUTE_DIRECTORY)
dirent->d_type = UV__DT_DIR;
else
dirent->d_type = UV__DT_FILE;
} while (next_entry_offset != 0);
/* Read the next chunk. */
status = pNtQueryDirectoryFile(dir_handle,
NULL,
NULL,
NULL,
&iosb,
&buffer,
sizeof buffer,
FileDirectoryInformation,
FALSE,
NULL,
FALSE);
/* After the first pNtQueryDirectoryFile call, the function may return
* STATUS_SUCCESS even if the buffer was too small to hold at least one
* directory entry.
*/
if (status == STATUS_SUCCESS && iosb.Information == 0)
status = STATUS_BUFFER_OVERFLOW;
}
if (status != STATUS_NO_MORE_FILES)
goto nt_error;
CloseHandle(dir_handle);
/* Store the result in the request object. */
req->ptr = dirents;
if (dirents != NULL)
req->flags |= UV_FS_FREE_PTR;
SET_REQ_RESULT(req, dirents_used);
/* `nbufs` will be used as index by uv_fs_scandir_next. */
req->fs.info.nbufs = 0;
return;
nt_error:
SET_REQ_WIN32_ERROR(req, pRtlNtStatusToDosError(status));
goto cleanup;
win32_error:
SET_REQ_WIN32_ERROR(req, GetLastError());
goto cleanup;
not_a_directory_error:
SET_REQ_UV_ERROR(req, UV_ENOTDIR, ERROR_DIRECTORY);
goto cleanup;
out_of_memory_error:
SET_REQ_UV_ERROR(req, UV_ENOMEM, ERROR_OUTOFMEMORY);
goto cleanup;
cleanup:
if (dir_handle != INVALID_HANDLE_VALUE)
CloseHandle(dir_handle);
while (dirents_used > 0)