| #![allow(nonstandard_style)] |
| |
| use crate::alloc::{Layout, alloc, dealloc}; |
| use crate::borrow::Cow; |
| use crate::ffi::{OsStr, OsString, c_void}; |
| use crate::fs::TryLockError; |
| use crate::io::{self, BorrowedCursor, Error, IoSlice, IoSliceMut, SeekFrom}; |
| use crate::mem::{self, MaybeUninit, offset_of}; |
| use crate::os::windows::io::{AsHandle, BorrowedHandle}; |
| use crate::os::windows::prelude::*; |
| use crate::path::{Path, PathBuf}; |
| use crate::sync::Arc; |
| use crate::sys::handle::Handle; |
| use crate::sys::pal::api::{self, WinError, set_file_information_by_handle}; |
| use crate::sys::pal::{IoResult, fill_utf16_buf, to_u16s, truncate_utf16_at_nul}; |
| use crate::sys::path::{WCStr, maybe_verbatim}; |
| use crate::sys::time::SystemTime; |
| use crate::sys::{Align8, c, cvt}; |
| use crate::sys_common::{AsInner, FromInner, IntoInner}; |
| use crate::{fmt, ptr, slice}; |
| |
| mod remove_dir_all; |
| use remove_dir_all::remove_dir_all_iterative; |
| |
| pub struct File { |
| handle: Handle, |
| } |
| |
| #[derive(Clone)] |
| pub struct FileAttr { |
| attributes: u32, |
| creation_time: c::FILETIME, |
| last_access_time: c::FILETIME, |
| last_write_time: c::FILETIME, |
| change_time: Option<c::FILETIME>, |
| file_size: u64, |
| reparse_tag: u32, |
| volume_serial_number: Option<u32>, |
| number_of_links: Option<u32>, |
| file_index: Option<u64>, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)] |
| pub struct FileType { |
| is_directory: bool, |
| is_symlink: bool, |
| } |
| |
| pub struct ReadDir { |
| handle: Option<FindNextFileHandle>, |
| root: Arc<PathBuf>, |
| first: Option<c::WIN32_FIND_DATAW>, |
| } |
| |
| struct FindNextFileHandle(c::HANDLE); |
| |
| unsafe impl Send for FindNextFileHandle {} |
| unsafe impl Sync for FindNextFileHandle {} |
| |
| pub struct DirEntry { |
| root: Arc<PathBuf>, |
| data: c::WIN32_FIND_DATAW, |
| } |
| |
| unsafe impl Send for OpenOptions {} |
| unsafe impl Sync for OpenOptions {} |
| |
| #[derive(Clone, Debug)] |
| pub struct OpenOptions { |
| // generic |
| read: bool, |
| write: bool, |
| append: bool, |
| truncate: bool, |
| create: bool, |
| create_new: bool, |
| // system-specific |
| custom_flags: u32, |
| access_mode: Option<u32>, |
| attributes: u32, |
| share_mode: u32, |
| security_qos_flags: u32, |
| inherit_handle: bool, |
| } |
| |
| #[derive(Clone, PartialEq, Eq, Debug)] |
| pub struct FilePermissions { |
| attrs: u32, |
| } |
| |
| #[derive(Copy, Clone, Debug, Default)] |
| pub struct FileTimes { |
| accessed: Option<c::FILETIME>, |
| modified: Option<c::FILETIME>, |
| created: Option<c::FILETIME>, |
| } |
| |
| impl fmt::Debug for c::FILETIME { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| let time = ((self.dwHighDateTime as u64) << 32) | self.dwLowDateTime as u64; |
| f.debug_tuple("FILETIME").field(&time).finish() |
| } |
| } |
| |
| #[derive(Debug)] |
| pub struct DirBuilder; |
| |
| impl fmt::Debug for ReadDir { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| // This will only be called from std::fs::ReadDir, which will add a "ReadDir()" frame. |
| // Thus the result will be e g 'ReadDir("C:\")' |
| fmt::Debug::fmt(&*self.root, f) |
| } |
| } |
| |
| impl Iterator for ReadDir { |
| type Item = io::Result<DirEntry>; |
| fn next(&mut self) -> Option<io::Result<DirEntry>> { |
| let Some(handle) = self.handle.as_ref() else { |
| // This iterator was initialized with an `INVALID_HANDLE_VALUE` as its handle. |
| // Simply return `None` because this is only the case when `FindFirstFileExW` in |
| // the construction of this iterator returns `ERROR_FILE_NOT_FOUND` which means |
| // no matchhing files can be found. |
| return None; |
| }; |
| if let Some(first) = self.first.take() { |
| if let Some(e) = DirEntry::new(&self.root, &first) { |
| return Some(Ok(e)); |
| } |
| } |
| unsafe { |
| let mut wfd = mem::zeroed(); |
| loop { |
| if c::FindNextFileW(handle.0, &mut wfd) == 0 { |
| self.handle = None; |
| match api::get_last_error() { |
| WinError::NO_MORE_FILES => return None, |
| WinError { code } => { |
| return Some(Err(Error::from_raw_os_error(code as i32))); |
| } |
| } |
| } |
| if let Some(e) = DirEntry::new(&self.root, &wfd) { |
| return Some(Ok(e)); |
| } |
| } |
| } |
| } |
| } |
| |
| impl Drop for FindNextFileHandle { |
| fn drop(&mut self) { |
| let r = unsafe { c::FindClose(self.0) }; |
| debug_assert!(r != 0); |
| } |
| } |
| |
| impl DirEntry { |
| fn new(root: &Arc<PathBuf>, wfd: &c::WIN32_FIND_DATAW) -> Option<DirEntry> { |
| match &wfd.cFileName[0..3] { |
| // check for '.' and '..' |
| &[46, 0, ..] | &[46, 46, 0, ..] => return None, |
| _ => {} |
| } |
| |
| Some(DirEntry { root: root.clone(), data: *wfd }) |
| } |
| |
| pub fn path(&self) -> PathBuf { |
| self.root.join(self.file_name()) |
| } |
| |
| pub fn file_name(&self) -> OsString { |
| let filename = truncate_utf16_at_nul(&self.data.cFileName); |
| OsString::from_wide(filename) |
| } |
| |
| pub fn file_type(&self) -> io::Result<FileType> { |
| Ok(FileType::new( |
| self.data.dwFileAttributes, |
| /* reparse_tag = */ self.data.dwReserved0, |
| )) |
| } |
| |
| pub fn metadata(&self) -> io::Result<FileAttr> { |
| Ok(self.data.into()) |
| } |
| } |
| |
| impl OpenOptions { |
| pub fn new() -> OpenOptions { |
| OpenOptions { |
| // generic |
| read: false, |
| write: false, |
| append: false, |
| truncate: false, |
| create: false, |
| create_new: false, |
| // system-specific |
| custom_flags: 0, |
| access_mode: None, |
| share_mode: c::FILE_SHARE_READ | c::FILE_SHARE_WRITE | c::FILE_SHARE_DELETE, |
| attributes: 0, |
| security_qos_flags: 0, |
| inherit_handle: false, |
| } |
| } |
| |
| pub fn read(&mut self, read: bool) { |
| self.read = read; |
| } |
| pub fn write(&mut self, write: bool) { |
| self.write = write; |
| } |
| pub fn append(&mut self, append: bool) { |
| self.append = append; |
| } |
| pub fn truncate(&mut self, truncate: bool) { |
| self.truncate = truncate; |
| } |
| pub fn create(&mut self, create: bool) { |
| self.create = create; |
| } |
| pub fn create_new(&mut self, create_new: bool) { |
| self.create_new = create_new; |
| } |
| |
| pub fn custom_flags(&mut self, flags: u32) { |
| self.custom_flags = flags; |
| } |
| pub fn access_mode(&mut self, access_mode: u32) { |
| self.access_mode = Some(access_mode); |
| } |
| pub fn share_mode(&mut self, share_mode: u32) { |
| self.share_mode = share_mode; |
| } |
| pub fn attributes(&mut self, attrs: u32) { |
| self.attributes = attrs; |
| } |
| pub fn security_qos_flags(&mut self, flags: u32) { |
| // We have to set `SECURITY_SQOS_PRESENT` here, because one of the valid flags we can |
| // receive is `SECURITY_ANONYMOUS = 0x0`, which we can't check for later on. |
| self.security_qos_flags = flags | c::SECURITY_SQOS_PRESENT; |
| } |
| pub fn inherit_handle(&mut self, inherit: bool) { |
| self.inherit_handle = inherit; |
| } |
| |
| fn get_access_mode(&self) -> io::Result<u32> { |
| match (self.read, self.write, self.append, self.access_mode) { |
| (.., Some(mode)) => Ok(mode), |
| (true, false, false, None) => Ok(c::GENERIC_READ), |
| (false, true, false, None) => Ok(c::GENERIC_WRITE), |
| (true, true, false, None) => Ok(c::GENERIC_READ | c::GENERIC_WRITE), |
| (false, _, true, None) => Ok(c::FILE_GENERIC_WRITE & !c::FILE_WRITE_DATA), |
| (true, _, true, None) => { |
| Ok(c::GENERIC_READ | (c::FILE_GENERIC_WRITE & !c::FILE_WRITE_DATA)) |
| } |
| (false, false, false, None) => { |
| Err(Error::from_raw_os_error(c::ERROR_INVALID_PARAMETER as i32)) |
| } |
| } |
| } |
| |
| fn get_creation_mode(&self) -> io::Result<u32> { |
| match (self.write, self.append) { |
| (true, false) => {} |
| (false, false) => { |
| if self.truncate || self.create || self.create_new { |
| return Err(Error::from_raw_os_error(c::ERROR_INVALID_PARAMETER as i32)); |
| } |
| } |
| (_, true) => { |
| if self.truncate && !self.create_new { |
| return Err(Error::from_raw_os_error(c::ERROR_INVALID_PARAMETER as i32)); |
| } |
| } |
| } |
| |
| Ok(match (self.create, self.truncate, self.create_new) { |
| (false, false, false) => c::OPEN_EXISTING, |
| (true, false, false) => c::OPEN_ALWAYS, |
| (false, true, false) => c::TRUNCATE_EXISTING, |
| // `CREATE_ALWAYS` has weird semantics so we emulate it using |
| // `OPEN_ALWAYS` and a manual truncation step. See #115745. |
| (true, true, false) => c::OPEN_ALWAYS, |
| (_, _, true) => c::CREATE_NEW, |
| }) |
| } |
| |
| fn get_flags_and_attributes(&self) -> u32 { |
| self.custom_flags |
| | self.attributes |
| | self.security_qos_flags |
| | if self.create_new { c::FILE_FLAG_OPEN_REPARSE_POINT } else { 0 } |
| } |
| } |
| |
| impl File { |
| pub fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> { |
| let path = maybe_verbatim(path)?; |
| // SAFETY: maybe_verbatim returns null-terminated strings |
| let path = unsafe { WCStr::from_wchars_with_null_unchecked(&path) }; |
| Self::open_native(&path, opts) |
| } |
| |
| fn open_native(path: &WCStr, opts: &OpenOptions) -> io::Result<File> { |
| let creation = opts.get_creation_mode()?; |
| let sa = c::SECURITY_ATTRIBUTES { |
| nLength: size_of::<c::SECURITY_ATTRIBUTES>() as u32, |
| lpSecurityDescriptor: ptr::null_mut(), |
| bInheritHandle: opts.inherit_handle as c::BOOL, |
| }; |
| let handle = unsafe { |
| c::CreateFileW( |
| path.as_ptr(), |
| opts.get_access_mode()?, |
| opts.share_mode, |
| if opts.inherit_handle { &sa } else { ptr::null() }, |
| creation, |
| opts.get_flags_and_attributes(), |
| ptr::null_mut(), |
| ) |
| }; |
| let handle = unsafe { HandleOrInvalid::from_raw_handle(handle) }; |
| if let Ok(handle) = OwnedHandle::try_from(handle) { |
| // Manual truncation. See #115745. |
| if opts.truncate |
| && creation == c::OPEN_ALWAYS |
| && api::get_last_error() == WinError::ALREADY_EXISTS |
| { |
| // This first tries `FileAllocationInfo` but falls back to |
| // `FileEndOfFileInfo` in order to support WINE. |
| // If WINE gains support for FileAllocationInfo, we should |
| // remove the fallback. |
| let alloc = c::FILE_ALLOCATION_INFO { AllocationSize: 0 }; |
| set_file_information_by_handle(handle.as_raw_handle(), &alloc) |
| .or_else(|_| { |
| let eof = c::FILE_END_OF_FILE_INFO { EndOfFile: 0 }; |
| set_file_information_by_handle(handle.as_raw_handle(), &eof) |
| }) |
| .io_result()?; |
| } |
| Ok(File { handle: Handle::from_inner(handle) }) |
| } else { |
| Err(Error::last_os_error()) |
| } |
| } |
| |
| pub fn fsync(&self) -> io::Result<()> { |
| cvt(unsafe { c::FlushFileBuffers(self.handle.as_raw_handle()) })?; |
| Ok(()) |
| } |
| |
| pub fn datasync(&self) -> io::Result<()> { |
| self.fsync() |
| } |
| |
| fn acquire_lock(&self, flags: c::LOCK_FILE_FLAGS) -> io::Result<()> { |
| unsafe { |
| let mut overlapped: c::OVERLAPPED = mem::zeroed(); |
| let event = c::CreateEventW(ptr::null_mut(), c::FALSE, c::FALSE, ptr::null()); |
| if event.is_null() { |
| return Err(io::Error::last_os_error()); |
| } |
| overlapped.hEvent = event; |
| let lock_result = cvt(c::LockFileEx( |
| self.handle.as_raw_handle(), |
| flags, |
| 0, |
| u32::MAX, |
| u32::MAX, |
| &mut overlapped, |
| )); |
| |
| let final_result = match lock_result { |
| Ok(_) => Ok(()), |
| Err(err) => { |
| if err.raw_os_error() == Some(c::ERROR_IO_PENDING as i32) { |
| // Wait for the lock to be acquired, and get the lock operation status. |
| // This can happen asynchronously, if the file handle was opened for async IO |
| let mut bytes_transferred = 0; |
| cvt(c::GetOverlappedResult( |
| self.handle.as_raw_handle(), |
| &mut overlapped, |
| &mut bytes_transferred, |
| c::TRUE, |
| )) |
| .map(|_| ()) |
| } else { |
| Err(err) |
| } |
| } |
| }; |
| c::CloseHandle(overlapped.hEvent); |
| final_result |
| } |
| } |
| |
| pub fn lock(&self) -> io::Result<()> { |
| self.acquire_lock(c::LOCKFILE_EXCLUSIVE_LOCK) |
| } |
| |
| pub fn lock_shared(&self) -> io::Result<()> { |
| self.acquire_lock(0) |
| } |
| |
| pub fn try_lock(&self) -> Result<(), TryLockError> { |
| let result = cvt(unsafe { |
| let mut overlapped = mem::zeroed(); |
| c::LockFileEx( |
| self.handle.as_raw_handle(), |
| c::LOCKFILE_EXCLUSIVE_LOCK | c::LOCKFILE_FAIL_IMMEDIATELY, |
| 0, |
| u32::MAX, |
| u32::MAX, |
| &mut overlapped, |
| ) |
| }); |
| |
| match result { |
| Ok(_) => Ok(()), |
| Err(err) if err.raw_os_error() == Some(c::ERROR_LOCK_VIOLATION as i32) => { |
| Err(TryLockError::WouldBlock) |
| } |
| Err(err) => Err(TryLockError::Error(err)), |
| } |
| } |
| |
| pub fn try_lock_shared(&self) -> Result<(), TryLockError> { |
| let result = cvt(unsafe { |
| let mut overlapped = mem::zeroed(); |
| c::LockFileEx( |
| self.handle.as_raw_handle(), |
| c::LOCKFILE_FAIL_IMMEDIATELY, |
| 0, |
| u32::MAX, |
| u32::MAX, |
| &mut overlapped, |
| ) |
| }); |
| |
| match result { |
| Ok(_) => Ok(()), |
| Err(err) if err.raw_os_error() == Some(c::ERROR_LOCK_VIOLATION as i32) => { |
| Err(TryLockError::WouldBlock) |
| } |
| Err(err) => Err(TryLockError::Error(err)), |
| } |
| } |
| |
| pub fn unlock(&self) -> io::Result<()> { |
| // Unlock the handle twice because LockFileEx() allows a file handle to acquire |
| // both an exclusive and shared lock, in which case the documentation states that: |
| // "...two unlock operations are necessary to unlock the region; the first unlock operation |
| // unlocks the exclusive lock, the second unlock operation unlocks the shared lock" |
| cvt(unsafe { c::UnlockFile(self.handle.as_raw_handle(), 0, 0, u32::MAX, u32::MAX) })?; |
| let result = |
| cvt(unsafe { c::UnlockFile(self.handle.as_raw_handle(), 0, 0, u32::MAX, u32::MAX) }); |
| match result { |
| Ok(_) => Ok(()), |
| Err(err) if err.raw_os_error() == Some(c::ERROR_NOT_LOCKED as i32) => Ok(()), |
| Err(err) => Err(err), |
| } |
| } |
| |
| pub fn truncate(&self, size: u64) -> io::Result<()> { |
| let info = c::FILE_END_OF_FILE_INFO { EndOfFile: size as i64 }; |
| api::set_file_information_by_handle(self.handle.as_raw_handle(), &info).io_result() |
| } |
| |
| #[cfg(not(target_vendor = "uwp"))] |
| pub fn file_attr(&self) -> io::Result<FileAttr> { |
| unsafe { |
| let mut info: c::BY_HANDLE_FILE_INFORMATION = mem::zeroed(); |
| cvt(c::GetFileInformationByHandle(self.handle.as_raw_handle(), &mut info))?; |
| let mut reparse_tag = 0; |
| if info.dwFileAttributes & c::FILE_ATTRIBUTE_REPARSE_POINT != 0 { |
| let mut attr_tag: c::FILE_ATTRIBUTE_TAG_INFO = mem::zeroed(); |
| cvt(c::GetFileInformationByHandleEx( |
| self.handle.as_raw_handle(), |
| c::FileAttributeTagInfo, |
| (&raw mut attr_tag).cast(), |
| size_of::<c::FILE_ATTRIBUTE_TAG_INFO>().try_into().unwrap(), |
| ))?; |
| if attr_tag.FileAttributes & c::FILE_ATTRIBUTE_REPARSE_POINT != 0 { |
| reparse_tag = attr_tag.ReparseTag; |
| } |
| } |
| Ok(FileAttr { |
| attributes: info.dwFileAttributes, |
| creation_time: info.ftCreationTime, |
| last_access_time: info.ftLastAccessTime, |
| last_write_time: info.ftLastWriteTime, |
| change_time: None, // Only available in FILE_BASIC_INFO |
| file_size: (info.nFileSizeLow as u64) | ((info.nFileSizeHigh as u64) << 32), |
| reparse_tag, |
| volume_serial_number: Some(info.dwVolumeSerialNumber), |
| number_of_links: Some(info.nNumberOfLinks), |
| file_index: Some( |
| (info.nFileIndexLow as u64) | ((info.nFileIndexHigh as u64) << 32), |
| ), |
| }) |
| } |
| } |
| |
| #[cfg(target_vendor = "uwp")] |
| pub fn file_attr(&self) -> io::Result<FileAttr> { |
| unsafe { |
| let mut info: c::FILE_BASIC_INFO = mem::zeroed(); |
| let size = size_of_val(&info); |
| cvt(c::GetFileInformationByHandleEx( |
| self.handle.as_raw_handle(), |
| c::FileBasicInfo, |
| (&raw mut info) as *mut c_void, |
| size as u32, |
| ))?; |
| let mut attr = FileAttr { |
| attributes: info.FileAttributes, |
| creation_time: c::FILETIME { |
| dwLowDateTime: info.CreationTime as u32, |
| dwHighDateTime: (info.CreationTime >> 32) as u32, |
| }, |
| last_access_time: c::FILETIME { |
| dwLowDateTime: info.LastAccessTime as u32, |
| dwHighDateTime: (info.LastAccessTime >> 32) as u32, |
| }, |
| last_write_time: c::FILETIME { |
| dwLowDateTime: info.LastWriteTime as u32, |
| dwHighDateTime: (info.LastWriteTime >> 32) as u32, |
| }, |
| change_time: Some(c::FILETIME { |
| dwLowDateTime: info.ChangeTime as u32, |
| dwHighDateTime: (info.ChangeTime >> 32) as u32, |
| }), |
| file_size: 0, |
| reparse_tag: 0, |
| volume_serial_number: None, |
| number_of_links: None, |
| file_index: None, |
| }; |
| let mut info: c::FILE_STANDARD_INFO = mem::zeroed(); |
| let size = size_of_val(&info); |
| cvt(c::GetFileInformationByHandleEx( |
| self.handle.as_raw_handle(), |
| c::FileStandardInfo, |
| (&raw mut info) as *mut c_void, |
| size as u32, |
| ))?; |
| attr.file_size = info.AllocationSize as u64; |
| attr.number_of_links = Some(info.NumberOfLinks); |
| if attr.attributes & c::FILE_ATTRIBUTE_REPARSE_POINT != 0 { |
| let mut attr_tag: c::FILE_ATTRIBUTE_TAG_INFO = mem::zeroed(); |
| cvt(c::GetFileInformationByHandleEx( |
| self.handle.as_raw_handle(), |
| c::FileAttributeTagInfo, |
| (&raw mut attr_tag).cast(), |
| size_of::<c::FILE_ATTRIBUTE_TAG_INFO>().try_into().unwrap(), |
| ))?; |
| if attr_tag.FileAttributes & c::FILE_ATTRIBUTE_REPARSE_POINT != 0 { |
| attr.reparse_tag = attr_tag.ReparseTag; |
| } |
| } |
| Ok(attr) |
| } |
| } |
| |
| pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> { |
| self.handle.read(buf) |
| } |
| |
| pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> { |
| self.handle.read_vectored(bufs) |
| } |
| |
| #[inline] |
| pub fn is_read_vectored(&self) -> bool { |
| self.handle.is_read_vectored() |
| } |
| |
| pub fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> { |
| self.handle.read_at(buf, offset) |
| } |
| |
| pub fn read_buf(&self, cursor: BorrowedCursor<'_>) -> io::Result<()> { |
| self.handle.read_buf(cursor) |
| } |
| |
| pub fn write(&self, buf: &[u8]) -> io::Result<usize> { |
| self.handle.write(buf) |
| } |
| |
| pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> { |
| self.handle.write_vectored(bufs) |
| } |
| |
| #[inline] |
| pub fn is_write_vectored(&self) -> bool { |
| self.handle.is_write_vectored() |
| } |
| |
| pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> { |
| self.handle.write_at(buf, offset) |
| } |
| |
| pub fn flush(&self) -> io::Result<()> { |
| Ok(()) |
| } |
| |
| pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> { |
| let (whence, pos) = match pos { |
| // Casting to `i64` is fine, `SetFilePointerEx` reinterprets this |
| // integer as `u64`. |
| SeekFrom::Start(n) => (c::FILE_BEGIN, n as i64), |
| SeekFrom::End(n) => (c::FILE_END, n), |
| SeekFrom::Current(n) => (c::FILE_CURRENT, n), |
| }; |
| let pos = pos as i64; |
| let mut newpos = 0; |
| cvt(unsafe { c::SetFilePointerEx(self.handle.as_raw_handle(), pos, &mut newpos, whence) })?; |
| Ok(newpos as u64) |
| } |
| |
| pub fn size(&self) -> Option<io::Result<u64>> { |
| let mut result = 0; |
| Some( |
| cvt(unsafe { c::GetFileSizeEx(self.handle.as_raw_handle(), &mut result) }) |
| .map(|_| result as u64), |
| ) |
| } |
| |
| pub fn tell(&self) -> io::Result<u64> { |
| self.seek(SeekFrom::Current(0)) |
| } |
| |
| pub fn duplicate(&self) -> io::Result<File> { |
| Ok(Self { handle: self.handle.try_clone()? }) |
| } |
| |
| // NB: returned pointer is derived from `space`, and has provenance to |
| // match. A raw pointer is returned rather than a reference in order to |
| // avoid narrowing provenance to the actual `REPARSE_DATA_BUFFER`. |
| fn reparse_point( |
| &self, |
| space: &mut Align8<[MaybeUninit<u8>]>, |
| ) -> io::Result<(u32, *mut c::REPARSE_DATA_BUFFER)> { |
| unsafe { |
| let mut bytes = 0; |
| cvt({ |
| // Grab this in advance to avoid it invalidating the pointer |
| // we get from `space.0.as_mut_ptr()`. |
| let len = space.0.len(); |
| c::DeviceIoControl( |
| self.handle.as_raw_handle(), |
| c::FSCTL_GET_REPARSE_POINT, |
| ptr::null_mut(), |
| 0, |
| space.0.as_mut_ptr().cast(), |
| len as u32, |
| &mut bytes, |
| ptr::null_mut(), |
| ) |
| })?; |
| const _: () = assert!(align_of::<c::REPARSE_DATA_BUFFER>() <= 8); |
| Ok((bytes, space.0.as_mut_ptr().cast::<c::REPARSE_DATA_BUFFER>())) |
| } |
| } |
| |
| fn readlink(&self) -> io::Result<PathBuf> { |
| let mut space = |
| Align8([MaybeUninit::<u8>::uninit(); c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE as usize]); |
| let (_bytes, buf) = self.reparse_point(&mut space)?; |
| unsafe { |
| let (path_buffer, subst_off, subst_len, relative) = match (*buf).ReparseTag { |
| c::IO_REPARSE_TAG_SYMLINK => { |
| let info: *mut c::SYMBOLIC_LINK_REPARSE_BUFFER = (&raw mut (*buf).rest).cast(); |
| assert!(info.is_aligned()); |
| ( |
| (&raw mut (*info).PathBuffer).cast::<u16>(), |
| (*info).SubstituteNameOffset / 2, |
| (*info).SubstituteNameLength / 2, |
| (*info).Flags & c::SYMLINK_FLAG_RELATIVE != 0, |
| ) |
| } |
| c::IO_REPARSE_TAG_MOUNT_POINT => { |
| let info: *mut c::MOUNT_POINT_REPARSE_BUFFER = (&raw mut (*buf).rest).cast(); |
| assert!(info.is_aligned()); |
| ( |
| (&raw mut (*info).PathBuffer).cast::<u16>(), |
| (*info).SubstituteNameOffset / 2, |
| (*info).SubstituteNameLength / 2, |
| false, |
| ) |
| } |
| _ => { |
| return Err(io::const_error!( |
| io::ErrorKind::Uncategorized, |
| "Unsupported reparse point type", |
| )); |
| } |
| }; |
| let subst_ptr = path_buffer.add(subst_off.into()); |
| let subst = slice::from_raw_parts_mut(subst_ptr, subst_len as usize); |
| // Absolute paths start with an NT internal namespace prefix `\??\` |
| // We should not let it leak through. |
| if !relative && subst.starts_with(&[92u16, 63u16, 63u16, 92u16]) { |
| // Turn `\??\` into `\\?\` (a verbatim path). |
| subst[1] = b'\\' as u16; |
| // Attempt to convert to a more user-friendly path. |
| let user = crate::sys::args::from_wide_to_user_path( |
| subst.iter().copied().chain([0]).collect(), |
| )?; |
| Ok(PathBuf::from(OsString::from_wide(user.strip_suffix(&[0]).unwrap_or(&user)))) |
| } else { |
| Ok(PathBuf::from(OsString::from_wide(subst))) |
| } |
| } |
| } |
| |
| pub fn set_permissions(&self, perm: FilePermissions) -> io::Result<()> { |
| let info = c::FILE_BASIC_INFO { |
| CreationTime: 0, |
| LastAccessTime: 0, |
| LastWriteTime: 0, |
| ChangeTime: 0, |
| FileAttributes: perm.attrs, |
| }; |
| api::set_file_information_by_handle(self.handle.as_raw_handle(), &info).io_result() |
| } |
| |
| pub fn set_times(&self, times: FileTimes) -> io::Result<()> { |
| let is_zero = |t: c::FILETIME| t.dwLowDateTime == 0 && t.dwHighDateTime == 0; |
| if times.accessed.map_or(false, is_zero) |
| || times.modified.map_or(false, is_zero) |
| || times.created.map_or(false, is_zero) |
| { |
| return Err(io::const_error!( |
| io::ErrorKind::InvalidInput, |
| "cannot set file timestamp to 0", |
| )); |
| } |
| let is_max = |t: c::FILETIME| t.dwLowDateTime == u32::MAX && t.dwHighDateTime == u32::MAX; |
| if times.accessed.map_or(false, is_max) |
| || times.modified.map_or(false, is_max) |
| || times.created.map_or(false, is_max) |
| { |
| return Err(io::const_error!( |
| io::ErrorKind::InvalidInput, |
| "cannot set file timestamp to 0xFFFF_FFFF_FFFF_FFFF", |
| )); |
| } |
| cvt(unsafe { |
| let created = |
| times.created.as_ref().map(|a| a as *const c::FILETIME).unwrap_or(ptr::null()); |
| let accessed = |
| times.accessed.as_ref().map(|a| a as *const c::FILETIME).unwrap_or(ptr::null()); |
| let modified = |
| times.modified.as_ref().map(|a| a as *const c::FILETIME).unwrap_or(ptr::null()); |
| c::SetFileTime(self.as_raw_handle(), created, accessed, modified) |
| })?; |
| Ok(()) |
| } |
| |
| /// Gets only basic file information such as attributes and file times. |
| fn basic_info(&self) -> io::Result<c::FILE_BASIC_INFO> { |
| unsafe { |
| let mut info: c::FILE_BASIC_INFO = mem::zeroed(); |
| let size = size_of_val(&info); |
| cvt(c::GetFileInformationByHandleEx( |
| self.handle.as_raw_handle(), |
| c::FileBasicInfo, |
| (&raw mut info) as *mut c_void, |
| size as u32, |
| ))?; |
| Ok(info) |
| } |
| } |
| |
| /// Deletes the file, consuming the file handle to ensure the delete occurs |
| /// as immediately as possible. |
| /// This attempts to use `posix_delete` but falls back to `win32_delete` |
| /// if that is not supported by the filesystem. |
| #[allow(unused)] |
| fn delete(self) -> Result<(), WinError> { |
| // If POSIX delete is not supported for this filesystem then fallback to win32 delete. |
| match self.posix_delete() { |
| Err(WinError::INVALID_PARAMETER) |
| | Err(WinError::NOT_SUPPORTED) |
| | Err(WinError::INVALID_FUNCTION) => self.win32_delete(), |
| result => result, |
| } |
| } |
| |
| /// Delete using POSIX semantics. |
| /// |
| /// Files will be deleted as soon as the handle is closed. This is supported |
| /// for Windows 10 1607 (aka RS1) and later. However some filesystem |
| /// drivers will not support it even then, e.g. FAT32. |
| /// |
| /// If the operation is not supported for this filesystem or OS version |
| /// then errors will be `ERROR_NOT_SUPPORTED` or `ERROR_INVALID_PARAMETER`. |
| #[allow(unused)] |
| fn posix_delete(&self) -> Result<(), WinError> { |
| let info = c::FILE_DISPOSITION_INFO_EX { |
| Flags: c::FILE_DISPOSITION_FLAG_DELETE |
| | c::FILE_DISPOSITION_FLAG_POSIX_SEMANTICS |
| | c::FILE_DISPOSITION_FLAG_IGNORE_READONLY_ATTRIBUTE, |
| }; |
| api::set_file_information_by_handle(self.handle.as_raw_handle(), &info) |
| } |
| |
| /// Delete a file using win32 semantics. The file won't actually be deleted |
| /// until all file handles are closed. However, marking a file for deletion |
| /// will prevent anyone from opening a new handle to the file. |
| #[allow(unused)] |
| fn win32_delete(&self) -> Result<(), WinError> { |
| let info = c::FILE_DISPOSITION_INFO { DeleteFile: true }; |
| api::set_file_information_by_handle(self.handle.as_raw_handle(), &info) |
| } |
| |
| /// Fill the given buffer with as many directory entries as will fit. |
| /// This will remember its position and continue from the last call unless |
| /// `restart` is set to `true`. |
| /// |
| /// The returned bool indicates if there are more entries or not. |
| /// It is an error if `self` is not a directory. |
| /// |
| /// # Symlinks and other reparse points |
| /// |
| /// On Windows a file is either a directory or a non-directory. |
| /// A symlink directory is simply an empty directory with some "reparse" metadata attached. |
| /// So if you open a link (not its target) and iterate the directory, |
| /// you will always iterate an empty directory regardless of the target. |
| #[allow(unused)] |
| fn fill_dir_buff(&self, buffer: &mut DirBuff, restart: bool) -> Result<bool, WinError> { |
| let class = |
| if restart { c::FileIdBothDirectoryRestartInfo } else { c::FileIdBothDirectoryInfo }; |
| |
| unsafe { |
| let result = c::GetFileInformationByHandleEx( |
| self.as_raw_handle(), |
| class, |
| buffer.as_mut_ptr().cast(), |
| buffer.capacity() as _, |
| ); |
| if result == 0 { |
| let err = api::get_last_error(); |
| if err.code == c::ERROR_NO_MORE_FILES { Ok(false) } else { Err(err) } |
| } else { |
| Ok(true) |
| } |
| } |
| } |
| } |
| |
| /// A buffer for holding directory entries. |
| struct DirBuff { |
| buffer: Box<Align8<[MaybeUninit<u8>; Self::BUFFER_SIZE]>>, |
| } |
| impl DirBuff { |
| const BUFFER_SIZE: usize = 1024; |
| fn new() -> Self { |
| Self { |
| // Safety: `Align8<[MaybeUninit<u8>; N]>` does not need |
| // initialization. |
| buffer: unsafe { Box::new_uninit().assume_init() }, |
| } |
| } |
| fn capacity(&self) -> usize { |
| self.buffer.0.len() |
| } |
| fn as_mut_ptr(&mut self) -> *mut u8 { |
| self.buffer.0.as_mut_ptr().cast() |
| } |
| /// Returns a `DirBuffIter`. |
| fn iter(&self) -> DirBuffIter<'_> { |
| DirBuffIter::new(self) |
| } |
| } |
| impl AsRef<[MaybeUninit<u8>]> for DirBuff { |
| fn as_ref(&self) -> &[MaybeUninit<u8>] { |
| &self.buffer.0 |
| } |
| } |
| |
| /// An iterator over entries stored in a `DirBuff`. |
| /// |
| /// Currently only returns file names (UTF-16 encoded). |
| struct DirBuffIter<'a> { |
| buffer: Option<&'a [MaybeUninit<u8>]>, |
| cursor: usize, |
| } |
| impl<'a> DirBuffIter<'a> { |
| fn new(buffer: &'a DirBuff) -> Self { |
| Self { buffer: Some(buffer.as_ref()), cursor: 0 } |
| } |
| } |
| impl<'a> Iterator for DirBuffIter<'a> { |
| type Item = (Cow<'a, [u16]>, bool); |
| fn next(&mut self) -> Option<Self::Item> { |
| let buffer = &self.buffer?[self.cursor..]; |
| |
| // Get the name and next entry from the buffer. |
| // SAFETY: |
| // - The buffer contains a `FILE_ID_BOTH_DIR_INFO` struct but the last |
| // field (the file name) is unsized. So an offset has to be used to |
| // get the file name slice. |
| // - The OS has guaranteed initialization of the fields of |
| // `FILE_ID_BOTH_DIR_INFO` and the trailing filename (for at least |
| // `FileNameLength` bytes) |
| let (name, is_directory, next_entry) = unsafe { |
| let info = buffer.as_ptr().cast::<c::FILE_ID_BOTH_DIR_INFO>(); |
| // While this is guaranteed to be aligned in documentation for |
| // https://docs.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-file_id_both_dir_info |
| // it does not seem that reality is so kind, and assuming this |
| // caused crashes in some cases (https://github.com/rust-lang/rust/issues/104530) |
| // presumably, this can be blamed on buggy filesystem drivers, but who knows. |
| let next_entry = (&raw const (*info).NextEntryOffset).read_unaligned() as usize; |
| let length = (&raw const (*info).FileNameLength).read_unaligned() as usize; |
| let attrs = (&raw const (*info).FileAttributes).read_unaligned(); |
| let name = from_maybe_unaligned( |
| (&raw const (*info).FileName).cast::<u16>(), |
| length / size_of::<u16>(), |
| ); |
| let is_directory = (attrs & c::FILE_ATTRIBUTE_DIRECTORY) != 0; |
| |
| (name, is_directory, next_entry) |
| }; |
| |
| if next_entry == 0 { |
| self.buffer = None |
| } else { |
| self.cursor += next_entry |
| } |
| |
| // Skip `.` and `..` pseudo entries. |
| const DOT: u16 = b'.' as u16; |
| match &name[..] { |
| [DOT] | [DOT, DOT] => self.next(), |
| _ => Some((name, is_directory)), |
| } |
| } |
| } |
| |
| unsafe fn from_maybe_unaligned<'a>(p: *const u16, len: usize) -> Cow<'a, [u16]> { |
| unsafe { |
| if p.is_aligned() { |
| Cow::Borrowed(crate::slice::from_raw_parts(p, len)) |
| } else { |
| Cow::Owned((0..len).map(|i| p.add(i).read_unaligned()).collect()) |
| } |
| } |
| } |
| |
| impl AsInner<Handle> for File { |
| #[inline] |
| fn as_inner(&self) -> &Handle { |
| &self.handle |
| } |
| } |
| |
| impl IntoInner<Handle> for File { |
| fn into_inner(self) -> Handle { |
| self.handle |
| } |
| } |
| |
| impl FromInner<Handle> for File { |
| fn from_inner(handle: Handle) -> File { |
| File { handle } |
| } |
| } |
| |
| impl AsHandle for File { |
| fn as_handle(&self) -> BorrowedHandle<'_> { |
| self.as_inner().as_handle() |
| } |
| } |
| |
| impl AsRawHandle for File { |
| fn as_raw_handle(&self) -> RawHandle { |
| self.as_inner().as_raw_handle() |
| } |
| } |
| |
| impl IntoRawHandle for File { |
| fn into_raw_handle(self) -> RawHandle { |
| self.into_inner().into_raw_handle() |
| } |
| } |
| |
| impl FromRawHandle for File { |
| unsafe fn from_raw_handle(raw_handle: RawHandle) -> Self { |
| unsafe { |
| Self { handle: FromInner::from_inner(FromRawHandle::from_raw_handle(raw_handle)) } |
| } |
| } |
| } |
| |
| impl fmt::Debug for File { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| // FIXME(#24570): add more info here (e.g., mode) |
| let mut b = f.debug_struct("File"); |
| b.field("handle", &self.handle.as_raw_handle()); |
| if let Ok(path) = get_path(self) { |
| b.field("path", &path); |
| } |
| b.finish() |
| } |
| } |
| |
| impl FileAttr { |
| pub fn size(&self) -> u64 { |
| self.file_size |
| } |
| |
| pub fn perm(&self) -> FilePermissions { |
| FilePermissions { attrs: self.attributes } |
| } |
| |
| pub fn attrs(&self) -> u32 { |
| self.attributes |
| } |
| |
| pub fn file_type(&self) -> FileType { |
| FileType::new(self.attributes, self.reparse_tag) |
| } |
| |
| pub fn modified(&self) -> io::Result<SystemTime> { |
| Ok(SystemTime::from(self.last_write_time)) |
| } |
| |
| pub fn accessed(&self) -> io::Result<SystemTime> { |
| Ok(SystemTime::from(self.last_access_time)) |
| } |
| |
| pub fn created(&self) -> io::Result<SystemTime> { |
| Ok(SystemTime::from(self.creation_time)) |
| } |
| |
| pub fn modified_u64(&self) -> u64 { |
| to_u64(&self.last_write_time) |
| } |
| |
| pub fn accessed_u64(&self) -> u64 { |
| to_u64(&self.last_access_time) |
| } |
| |
| pub fn created_u64(&self) -> u64 { |
| to_u64(&self.creation_time) |
| } |
| |
| pub fn changed_u64(&self) -> Option<u64> { |
| self.change_time.as_ref().map(|c| to_u64(c)) |
| } |
| |
| pub fn volume_serial_number(&self) -> Option<u32> { |
| self.volume_serial_number |
| } |
| |
| pub fn number_of_links(&self) -> Option<u32> { |
| self.number_of_links |
| } |
| |
| pub fn file_index(&self) -> Option<u64> { |
| self.file_index |
| } |
| } |
| impl From<c::WIN32_FIND_DATAW> for FileAttr { |
| fn from(wfd: c::WIN32_FIND_DATAW) -> Self { |
| FileAttr { |
| attributes: wfd.dwFileAttributes, |
| creation_time: wfd.ftCreationTime, |
| last_access_time: wfd.ftLastAccessTime, |
| last_write_time: wfd.ftLastWriteTime, |
| change_time: None, |
| file_size: ((wfd.nFileSizeHigh as u64) << 32) | (wfd.nFileSizeLow as u64), |
| reparse_tag: if wfd.dwFileAttributes & c::FILE_ATTRIBUTE_REPARSE_POINT != 0 { |
| // reserved unless this is a reparse point |
| wfd.dwReserved0 |
| } else { |
| 0 |
| }, |
| volume_serial_number: None, |
| number_of_links: None, |
| file_index: None, |
| } |
| } |
| } |
| |
| fn to_u64(ft: &c::FILETIME) -> u64 { |
| (ft.dwLowDateTime as u64) | ((ft.dwHighDateTime as u64) << 32) |
| } |
| |
| impl FilePermissions { |
| pub fn readonly(&self) -> bool { |
| self.attrs & c::FILE_ATTRIBUTE_READONLY != 0 |
| } |
| |
| pub fn set_readonly(&mut self, readonly: bool) { |
| if readonly { |
| self.attrs |= c::FILE_ATTRIBUTE_READONLY; |
| } else { |
| self.attrs &= !c::FILE_ATTRIBUTE_READONLY; |
| } |
| } |
| } |
| |
| impl FileTimes { |
| pub fn set_accessed(&mut self, t: SystemTime) { |
| self.accessed = Some(t.into_inner()); |
| } |
| |
| pub fn set_modified(&mut self, t: SystemTime) { |
| self.modified = Some(t.into_inner()); |
| } |
| |
| pub fn set_created(&mut self, t: SystemTime) { |
| self.created = Some(t.into_inner()); |
| } |
| } |
| |
| impl FileType { |
| fn new(attributes: u32, reparse_tag: u32) -> FileType { |
| let is_directory = attributes & c::FILE_ATTRIBUTE_DIRECTORY != 0; |
| let is_symlink = { |
| let is_reparse_point = attributes & c::FILE_ATTRIBUTE_REPARSE_POINT != 0; |
| let is_reparse_tag_name_surrogate = reparse_tag & 0x20000000 != 0; |
| is_reparse_point && is_reparse_tag_name_surrogate |
| }; |
| FileType { is_directory, is_symlink } |
| } |
| pub fn is_dir(&self) -> bool { |
| !self.is_symlink && self.is_directory |
| } |
| pub fn is_file(&self) -> bool { |
| !self.is_symlink && !self.is_directory |
| } |
| pub fn is_symlink(&self) -> bool { |
| self.is_symlink |
| } |
| pub fn is_symlink_dir(&self) -> bool { |
| self.is_symlink && self.is_directory |
| } |
| pub fn is_symlink_file(&self) -> bool { |
| self.is_symlink && !self.is_directory |
| } |
| } |
| |
| impl DirBuilder { |
| pub fn new() -> DirBuilder { |
| DirBuilder |
| } |
| |
| pub fn mkdir(&self, p: &Path) -> io::Result<()> { |
| let p = maybe_verbatim(p)?; |
| cvt(unsafe { c::CreateDirectoryW(p.as_ptr(), ptr::null_mut()) })?; |
| Ok(()) |
| } |
| } |
| |
| pub fn readdir(p: &Path) -> io::Result<ReadDir> { |
| // We push a `*` to the end of the path which cause the empty path to be |
| // treated as the current directory. So, for consistency with other platforms, |
| // we explicitly error on the empty path. |
| if p.as_os_str().is_empty() { |
| // Return an error code consistent with other ways of opening files. |
| // E.g. fs::metadata or File::open. |
| return Err(io::Error::from_raw_os_error(c::ERROR_PATH_NOT_FOUND as i32)); |
| } |
| let root = p.to_path_buf(); |
| let star = p.join("*"); |
| let path = maybe_verbatim(&star)?; |
| |
| unsafe { |
| let mut wfd: c::WIN32_FIND_DATAW = mem::zeroed(); |
| // this is like FindFirstFileW (see https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-findfirstfileexw), |
| // but with FindExInfoBasic it should skip filling WIN32_FIND_DATAW.cAlternateFileName |
| // (see https://learn.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-win32_find_dataw) |
| // (which will be always null string value and currently unused) and should be faster. |
| // |
| // We can pass FIND_FIRST_EX_LARGE_FETCH to dwAdditionalFlags to speed up things more, |
| // but as we don't know user's use profile of this function, lets be conservative. |
| let find_handle = c::FindFirstFileExW( |
| path.as_ptr(), |
| c::FindExInfoBasic, |
| &mut wfd as *mut _ as _, |
| c::FindExSearchNameMatch, |
| ptr::null(), |
| 0, |
| ); |
| |
| if find_handle != c::INVALID_HANDLE_VALUE { |
| Ok(ReadDir { |
| handle: Some(FindNextFileHandle(find_handle)), |
| root: Arc::new(root), |
| first: Some(wfd), |
| }) |
| } else { |
| // The status `ERROR_FILE_NOT_FOUND` is returned by the `FindFirstFileExW` function |
| // if no matching files can be found, but not necessarily that the path to find the |
| // files in does not exist. |
| // |
| // Hence, a check for whether the path to search in exists is added when the last |
| // os error returned by Windows is `ERROR_FILE_NOT_FOUND` to handle this scenario. |
| // If that is the case, an empty `ReadDir` iterator is returned as it returns `None` |
| // in the initial `.next()` invocation because `ERROR_NO_MORE_FILES` would have been |
| // returned by the `FindNextFileW` function. |
| // |
| // See issue #120040: https://github.com/rust-lang/rust/issues/120040. |
| let last_error = api::get_last_error(); |
| if last_error == WinError::FILE_NOT_FOUND { |
| return Ok(ReadDir { handle: None, root: Arc::new(root), first: None }); |
| } |
| |
| // Just return the error constructed from the raw OS error if the above is not the case. |
| // |
| // Note: `ERROR_PATH_NOT_FOUND` would have been returned by the `FindFirstFileExW` function |
| // when the path to search in does not exist in the first place. |
| Err(Error::from_raw_os_error(last_error.code as i32)) |
| } |
| } |
| } |
| |
| pub fn unlink(path: &WCStr) -> io::Result<()> { |
| if unsafe { c::DeleteFileW(path.as_ptr()) } == 0 { |
| let err = api::get_last_error(); |
| // if `DeleteFileW` fails with ERROR_ACCESS_DENIED then try to remove |
| // the file while ignoring the readonly attribute. |
| // This is accomplished by calling the `posix_delete` function on an open file handle. |
| if err == WinError::ACCESS_DENIED { |
| let mut opts = OpenOptions::new(); |
| opts.access_mode(c::DELETE); |
| opts.custom_flags(c::FILE_FLAG_OPEN_REPARSE_POINT); |
| if let Ok(f) = File::open_native(&path, &opts) { |
| if f.posix_delete().is_ok() { |
| return Ok(()); |
| } |
| } |
| } |
| // return the original error if any of the above fails. |
| Err(io::Error::from_raw_os_error(err.code as i32)) |
| } else { |
| Ok(()) |
| } |
| } |
| |
| pub fn rename(old: &WCStr, new: &WCStr) -> io::Result<()> { |
| if unsafe { c::MoveFileExW(old.as_ptr(), new.as_ptr(), c::MOVEFILE_REPLACE_EXISTING) } == 0 { |
| let err = api::get_last_error(); |
| // if `MoveFileExW` fails with ERROR_ACCESS_DENIED then try to move |
| // the file while ignoring the readonly attribute. |
| // This is accomplished by calling `SetFileInformationByHandle` with `FileRenameInfoEx`. |
| if err == WinError::ACCESS_DENIED { |
| let mut opts = OpenOptions::new(); |
| opts.access_mode(c::DELETE); |
| opts.custom_flags(c::FILE_FLAG_OPEN_REPARSE_POINT | c::FILE_FLAG_BACKUP_SEMANTICS); |
| let Ok(f) = File::open_native(&old, &opts) else { return Err(err).io_result() }; |
| |
| // Calculate the layout of the `FILE_RENAME_INFO` we pass to `SetFileInformation` |
| // This is a dynamically sized struct so we need to get the position of the last field to calculate the actual size. |
| let Ok(new_len_without_nul_in_bytes): Result<u32, _> = |
| ((new.count_bytes() - 1) * 2).try_into() |
| else { |
| return Err(err).io_result(); |
| }; |
| let offset: u32 = offset_of!(c::FILE_RENAME_INFO, FileName).try_into().unwrap(); |
| let struct_size = offset + new_len_without_nul_in_bytes + 2; |
| let layout = |
| Layout::from_size_align(struct_size as usize, align_of::<c::FILE_RENAME_INFO>()) |
| .unwrap(); |
| |
| // SAFETY: We allocate enough memory for a full FILE_RENAME_INFO struct and a filename. |
| let file_rename_info; |
| unsafe { |
| file_rename_info = alloc(layout).cast::<c::FILE_RENAME_INFO>(); |
| if file_rename_info.is_null() { |
| return Err(io::ErrorKind::OutOfMemory.into()); |
| } |
| |
| (&raw mut (*file_rename_info).Anonymous).write(c::FILE_RENAME_INFO_0 { |
| Flags: c::FILE_RENAME_FLAG_REPLACE_IF_EXISTS |
| | c::FILE_RENAME_FLAG_POSIX_SEMANTICS, |
| }); |
| |
| (&raw mut (*file_rename_info).RootDirectory).write(ptr::null_mut()); |
| // Don't include the NULL in the size |
| (&raw mut (*file_rename_info).FileNameLength).write(new_len_without_nul_in_bytes); |
| |
| new.as_ptr().copy_to_nonoverlapping( |
| (&raw mut (*file_rename_info).FileName).cast::<u16>(), |
| new.count_bytes(), |
| ); |
| } |
| |
| let result = unsafe { |
| c::SetFileInformationByHandle( |
| f.as_raw_handle(), |
| c::FileRenameInfoEx, |
| file_rename_info.cast::<c_void>(), |
| struct_size, |
| ) |
| }; |
| unsafe { dealloc(file_rename_info.cast::<u8>(), layout) }; |
| if result == 0 { |
| if api::get_last_error() == WinError::DIR_NOT_EMPTY { |
| return Err(WinError::DIR_NOT_EMPTY).io_result(); |
| } else { |
| return Err(err).io_result(); |
| } |
| } |
| } else { |
| return Err(err).io_result(); |
| } |
| } |
| Ok(()) |
| } |
| |
| pub fn rmdir(p: &WCStr) -> io::Result<()> { |
| cvt(unsafe { c::RemoveDirectoryW(p.as_ptr()) })?; |
| Ok(()) |
| } |
| |
| pub fn remove_dir_all(path: &WCStr) -> io::Result<()> { |
| // Open a file or directory without following symlinks. |
| let mut opts = OpenOptions::new(); |
| opts.access_mode(c::FILE_LIST_DIRECTORY); |
| // `FILE_FLAG_BACKUP_SEMANTICS` allows opening directories. |
| // `FILE_FLAG_OPEN_REPARSE_POINT` opens a link instead of its target. |
| opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS | c::FILE_FLAG_OPEN_REPARSE_POINT); |
| let file = File::open_native(path, &opts)?; |
| |
| // Test if the file is not a directory or a symlink to a directory. |
| if (file.basic_info()?.FileAttributes & c::FILE_ATTRIBUTE_DIRECTORY) == 0 { |
| return Err(io::Error::from_raw_os_error(c::ERROR_DIRECTORY as _)); |
| } |
| |
| // Remove the directory and all its contents. |
| remove_dir_all_iterative(file).io_result() |
| } |
| |
| pub fn readlink(path: &WCStr) -> io::Result<PathBuf> { |
| // Open the link with no access mode, instead of generic read. |
| // By default FILE_LIST_DIRECTORY is denied for the junction "C:\Documents and Settings", so |
| // this is needed for a common case. |
| let mut opts = OpenOptions::new(); |
| opts.access_mode(0); |
| opts.custom_flags(c::FILE_FLAG_OPEN_REPARSE_POINT | c::FILE_FLAG_BACKUP_SEMANTICS); |
| let file = File::open_native(&path, &opts)?; |
| file.readlink() |
| } |
| |
| pub fn symlink(original: &Path, link: &Path) -> io::Result<()> { |
| symlink_inner(original, link, false) |
| } |
| |
| pub fn symlink_inner(original: &Path, link: &Path, dir: bool) -> io::Result<()> { |
| let original = to_u16s(original)?; |
| let link = maybe_verbatim(link)?; |
| let flags = if dir { c::SYMBOLIC_LINK_FLAG_DIRECTORY } else { 0 }; |
| // Formerly, symlink creation required the SeCreateSymbolicLink privilege. For the Windows 10 |
| // Creators Update, Microsoft loosened this to allow unprivileged symlink creation if the |
| // computer is in Developer Mode, but SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE must be |
| // added to dwFlags to opt into this behavior. |
| let result = cvt(unsafe { |
| c::CreateSymbolicLinkW( |
| link.as_ptr(), |
| original.as_ptr(), |
| flags | c::SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE, |
| ) as c::BOOL |
| }); |
| if let Err(err) = result { |
| if err.raw_os_error() == Some(c::ERROR_INVALID_PARAMETER as i32) { |
| // Older Windows objects to SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE, |
| // so if we encounter ERROR_INVALID_PARAMETER, retry without that flag. |
| cvt(unsafe { |
| c::CreateSymbolicLinkW(link.as_ptr(), original.as_ptr(), flags) as c::BOOL |
| })?; |
| } else { |
| return Err(err); |
| } |
| } |
| Ok(()) |
| } |
| |
| #[cfg(not(target_vendor = "uwp"))] |
| pub fn link(original: &WCStr, link: &WCStr) -> io::Result<()> { |
| cvt(unsafe { c::CreateHardLinkW(link.as_ptr(), original.as_ptr(), ptr::null_mut()) })?; |
| Ok(()) |
| } |
| |
| #[cfg(target_vendor = "uwp")] |
| pub fn link(_original: &WCStr, _link: &WCStr) -> io::Result<()> { |
| return Err(io::const_error!(io::ErrorKind::Unsupported, "hard link are not supported on UWP")); |
| } |
| |
| pub fn stat(path: &WCStr) -> io::Result<FileAttr> { |
| match metadata(path, ReparsePoint::Follow) { |
| Err(err) if err.raw_os_error() == Some(c::ERROR_CANT_ACCESS_FILE as i32) => { |
| if let Ok(attrs) = lstat(path) { |
| if !attrs.file_type().is_symlink() { |
| return Ok(attrs); |
| } |
| } |
| Err(err) |
| } |
| result => result, |
| } |
| } |
| |
| pub fn lstat(path: &WCStr) -> io::Result<FileAttr> { |
| metadata(path, ReparsePoint::Open) |
| } |
| |
| #[repr(u32)] |
| #[derive(Clone, Copy, PartialEq, Eq)] |
| enum ReparsePoint { |
| Follow = 0, |
| Open = c::FILE_FLAG_OPEN_REPARSE_POINT, |
| } |
| impl ReparsePoint { |
| fn as_flag(self) -> u32 { |
| self as u32 |
| } |
| } |
| |
| fn metadata(path: &WCStr, reparse: ReparsePoint) -> io::Result<FileAttr> { |
| let mut opts = OpenOptions::new(); |
| // No read or write permissions are necessary |
| opts.access_mode(0); |
| opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS | reparse.as_flag()); |
| |
| // Attempt to open the file normally. |
| // If that fails with `ERROR_SHARING_VIOLATION` then retry using `FindFirstFileExW`. |
| // If the fallback fails for any reason we return the original error. |
| match File::open_native(&path, &opts) { |
| Ok(file) => file.file_attr(), |
| Err(e) |
| if [Some(c::ERROR_SHARING_VIOLATION as _), Some(c::ERROR_ACCESS_DENIED as _)] |
| .contains(&e.raw_os_error()) => |
| { |
| // `ERROR_ACCESS_DENIED` is returned when the user doesn't have permission for the resource. |
| // One such example is `System Volume Information` as default but can be created as well |
| // `ERROR_SHARING_VIOLATION` will almost never be returned. |
| // Usually if a file is locked you can still read some metadata. |
| // However, there are special system files, such as |
| // `C:\hiberfil.sys`, that are locked in a way that denies even that. |
| unsafe { |
| // `FindFirstFileExW` accepts wildcard file names. |
| // Fortunately wildcards are not valid file names and |
| // `ERROR_SHARING_VIOLATION` means the file exists (but is locked) |
| // therefore it's safe to assume the file name given does not |
| // include wildcards. |
| let mut wfd: c::WIN32_FIND_DATAW = mem::zeroed(); |
| let handle = c::FindFirstFileExW( |
| path.as_ptr(), |
| c::FindExInfoBasic, |
| &mut wfd as *mut _ as _, |
| c::FindExSearchNameMatch, |
| ptr::null(), |
| 0, |
| ); |
| |
| if handle == c::INVALID_HANDLE_VALUE { |
| // This can fail if the user does not have read access to the |
| // directory. |
| Err(e) |
| } else { |
| // We no longer need the find handle. |
| c::FindClose(handle); |
| |
| // `FindFirstFileExW` reads the cached file information from the |
| // directory. The downside is that this metadata may be outdated. |
| let attrs = FileAttr::from(wfd); |
| if reparse == ReparsePoint::Follow && attrs.file_type().is_symlink() { |
| Err(e) |
| } else { |
| Ok(attrs) |
| } |
| } |
| } |
| } |
| Err(e) => Err(e), |
| } |
| } |
| |
| pub fn set_perm(p: &WCStr, perm: FilePermissions) -> io::Result<()> { |
| unsafe { |
| cvt(c::SetFileAttributesW(p.as_ptr(), perm.attrs))?; |
| Ok(()) |
| } |
| } |
| |
| fn get_path(f: &File) -> io::Result<PathBuf> { |
| fill_utf16_buf( |
| |buf, sz| unsafe { |
| c::GetFinalPathNameByHandleW(f.handle.as_raw_handle(), buf, sz, c::VOLUME_NAME_DOS) |
| }, |
| |buf| PathBuf::from(OsString::from_wide(buf)), |
| ) |
| } |
| |
| pub fn canonicalize(p: &WCStr) -> io::Result<PathBuf> { |
| let mut opts = OpenOptions::new(); |
| // No read or write permissions are necessary |
| opts.access_mode(0); |
| // This flag is so we can open directories too |
| opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS); |
| let f = File::open_native(p, &opts)?; |
| get_path(&f) |
| } |
| |
| pub fn copy(from: &WCStr, to: &WCStr) -> io::Result<u64> { |
| unsafe extern "system" fn callback( |
| _TotalFileSize: i64, |
| _TotalBytesTransferred: i64, |
| _StreamSize: i64, |
| StreamBytesTransferred: i64, |
| dwStreamNumber: u32, |
| _dwCallbackReason: u32, |
| _hSourceFile: c::HANDLE, |
| _hDestinationFile: c::HANDLE, |
| lpData: *const c_void, |
| ) -> u32 { |
| unsafe { |
| if dwStreamNumber == 1 { |
| *(lpData as *mut i64) = StreamBytesTransferred; |
| } |
| c::PROGRESS_CONTINUE |
| } |
| } |
| let mut size = 0i64; |
| cvt(unsafe { |
| c::CopyFileExW( |
| from.as_ptr(), |
| to.as_ptr(), |
| Some(callback), |
| (&raw mut size) as *mut _, |
| ptr::null_mut(), |
| 0, |
| ) |
| })?; |
| Ok(size as u64) |
| } |
| |
| pub fn junction_point(original: &Path, link: &Path) -> io::Result<()> { |
| // Create and open a new directory in one go. |
| let mut opts = OpenOptions::new(); |
| opts.create_new(true); |
| opts.write(true); |
| opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS | c::FILE_FLAG_POSIX_SEMANTICS); |
| opts.attributes(c::FILE_ATTRIBUTE_DIRECTORY); |
| |
| let d = File::open(link, &opts)?; |
| |
| // We need to get an absolute, NT-style path. |
| let path_bytes = original.as_os_str().as_encoded_bytes(); |
| let abs_path: Vec<u16> = if path_bytes.starts_with(br"\\?\") || path_bytes.starts_with(br"\??\") |
| { |
| // It's already an absolute path, we just need to convert the prefix to `\??\` |
| let bytes = unsafe { OsStr::from_encoded_bytes_unchecked(&path_bytes[4..]) }; |
| r"\??\".encode_utf16().chain(bytes.encode_wide()).collect() |
| } else { |
| // Get an absolute path and then convert the prefix to `\??\` |
| let abs_path = crate::path::absolute(original)?.into_os_string().into_encoded_bytes(); |
| if abs_path.len() > 0 && abs_path[1..].starts_with(br":\") { |
| let bytes = unsafe { OsStr::from_encoded_bytes_unchecked(&abs_path) }; |
| r"\??\".encode_utf16().chain(bytes.encode_wide()).collect() |
| } else if abs_path.starts_with(br"\\.\") { |
| let bytes = unsafe { OsStr::from_encoded_bytes_unchecked(&abs_path[4..]) }; |
| r"\??\".encode_utf16().chain(bytes.encode_wide()).collect() |
| } else if abs_path.starts_with(br"\\") { |
| let bytes = unsafe { OsStr::from_encoded_bytes_unchecked(&abs_path[2..]) }; |
| r"\??\UNC\".encode_utf16().chain(bytes.encode_wide()).collect() |
| } else { |
| return Err(io::const_error!(io::ErrorKind::InvalidInput, "path is not valid")); |
| } |
| }; |
| // Defined inline so we don't have to mess about with variable length buffer. |
| #[repr(C)] |
| pub struct MountPointBuffer { |
| ReparseTag: u32, |
| ReparseDataLength: u16, |
| Reserved: u16, |
| SubstituteNameOffset: u16, |
| SubstituteNameLength: u16, |
| PrintNameOffset: u16, |
| PrintNameLength: u16, |
| PathBuffer: [MaybeUninit<u16>; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE as usize], |
| } |
| let data_len = 12 + (abs_path.len() * 2); |
| if data_len > u16::MAX as usize { |
| return Err(io::const_error!(io::ErrorKind::InvalidInput, "`original` path is too long")); |
| } |
| let data_len = data_len as u16; |
| let mut header = MountPointBuffer { |
| ReparseTag: c::IO_REPARSE_TAG_MOUNT_POINT, |
| ReparseDataLength: data_len, |
| Reserved: 0, |
| SubstituteNameOffset: 0, |
| SubstituteNameLength: (abs_path.len() * 2) as u16, |
| PrintNameOffset: ((abs_path.len() + 1) * 2) as u16, |
| PrintNameLength: 0, |
| PathBuffer: [MaybeUninit::uninit(); c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE as usize], |
| }; |
| unsafe { |
| let ptr = header.PathBuffer.as_mut_ptr(); |
| ptr.copy_from(abs_path.as_ptr().cast_uninit(), abs_path.len()); |
| |
| let mut ret = 0; |
| cvt(c::DeviceIoControl( |
| d.as_raw_handle(), |
| c::FSCTL_SET_REPARSE_POINT, |
| (&raw const header).cast::<c_void>(), |
| data_len as u32 + 8, |
| ptr::null_mut(), |
| 0, |
| &mut ret, |
| ptr::null_mut(), |
| )) |
| .map(drop) |
| } |
| } |
| |
| // Try to see if a file exists but, unlike `exists`, report I/O errors. |
| pub fn exists(path: &WCStr) -> io::Result<bool> { |
| // Open the file to ensure any symlinks are followed to their target. |
| let mut opts = OpenOptions::new(); |
| // No read, write, etc access rights are needed. |
| opts.access_mode(0); |
| // Backup semantics enables opening directories as well as files. |
| opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS); |
| match File::open_native(path, &opts) { |
| Err(e) => match e.kind() { |
| // The file definitely does not exist |
| io::ErrorKind::NotFound => Ok(false), |
| |
| // `ERROR_SHARING_VIOLATION` means that the file has been locked by |
| // another process. This is often temporary so we simply report it |
| // as the file existing. |
| _ if e.raw_os_error() == Some(c::ERROR_SHARING_VIOLATION as i32) => Ok(true), |
| |
| // `ERROR_CANT_ACCESS_FILE` means that a file exists but that the |
| // reparse point could not be handled by `CreateFile`. |
| // This can happen for special files such as: |
| // * Unix domain sockets which you need to `connect` to |
| // * App exec links which require using `CreateProcess` |
| _ if e.raw_os_error() == Some(c::ERROR_CANT_ACCESS_FILE as i32) => Ok(true), |
| |
| // Other errors such as `ERROR_ACCESS_DENIED` may indicate that the |
| // file exists. However, these types of errors are usually more |
| // permanent so we report them here. |
| _ => Err(e), |
| }, |
| // The file was opened successfully therefore it must exist, |
| Ok(_) => Ok(true), |
| } |
| } |
