mirror of
https://github.com/ncruces/go-sqlite3.git
synced 2026-01-12 14:09:13 +00:00
Simplify windows hacks.
This commit is contained in:
Nuno Cruces
163
sys_windows.go
163
sys_windows.go
@@ -1,163 +0,0 @@
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package sqlite3
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import (
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"io/fs"
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"os"
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"path/filepath"
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"syscall"
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)
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// osOpenFile is the Windows implementation of OpenFile.
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func osOpenFile(name string, flag int, perm fs.FileMode) (*os.File, error) {
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if name == "" {
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return nil, &os.PathError{Op: "open", Path: name, Err: syscall.ENOENT}
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}
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path := osFixLongPath(name)
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r, e := syscallOpen(path, flag, syscallMode(perm))
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if e != nil {
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return nil, &os.PathError{Op: "open", Path: name, Err: e}
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}
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return os.NewFile(uintptr(r), name), nil
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}
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// fixLongPath returns the extended-length (\\?\-prefixed) form of
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// path when needed, in order to avoid the default 260 character file
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// path limit imposed by Windows. If path is not easily converted to
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// the extended-length form (for example, if path is a relative path
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// or contains .. elements), or is short enough, osFixLongPath returns
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// path unmodified.
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//
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// See https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath
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func osFixLongPath(path string) string {
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// Do nothing (and don't allocate) if the path is "short".
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// Empirically (at least on the Windows Server 2013 builder),
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// the kernel is arbitrarily okay with < 248 bytes. That
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// matches what the docs above say:
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// "When using an API to create a directory, the specified
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// path cannot be so long that you cannot append an 8.3 file
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// name (that is, the directory name cannot exceed MAX_PATH
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// minus 12)." Since MAX_PATH is 260, 260 - 12 = 248.
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//
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// The MSDN docs appear to say that a normal path that is 248 bytes long
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// will work; empirically the path must be less then 248 bytes long.
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if len(path) < 248 {
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// Don't fix. (This is how Go 1.7 and earlier worked,
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// not automatically generating the \\?\ form)
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return path
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}
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// The extended form begins with \\?\, as in
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// \\?\c:\windows\foo.txt or \\?\UNC\server\share\foo.txt.
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// The extended form disables evaluation of . and .. path
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// elements and disables the interpretation of / as equivalent
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// to \. The conversion here rewrites / to \ and elides
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// . elements as well as trailing or duplicate separators. For
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// simplicity it avoids the conversion entirely for relative
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// paths or paths containing .. elements. For now,
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// \\server\share paths are not converted to
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// \\?\UNC\server\share paths because the rules for doing so
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// are less well-specified.
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if len(path) >= 2 && path[:2] == `\\` {
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// Don't canonicalize UNC paths.
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return path
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}
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if !filepath.IsAbs(path) {
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// Relative path
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return path
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}
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const prefix = `\\?`
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pathbuf := make([]byte, len(prefix)+len(path)+len(`\`))
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copy(pathbuf, prefix)
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n := len(path)
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r, w := 0, len(prefix)
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for r < n {
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switch {
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case os.IsPathSeparator(path[r]):
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// empty block
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r++
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case path[r] == '.' && (r+1 == n || os.IsPathSeparator(path[r+1])):
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// /./
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r++
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case r+1 < n && path[r] == '.' && path[r+1] == '.' && (r+2 == n || os.IsPathSeparator(path[r+2])):
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// /../ is currently unhandled
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return path
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default:
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pathbuf[w] = '\\'
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w++
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for ; r < n && !os.IsPathSeparator(path[r]); r++ {
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pathbuf[w] = path[r]
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w++
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}
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}
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}
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// A drive's root directory needs a trailing \
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if w == len(`\\?\c:`) {
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pathbuf[w] = '\\'
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w++
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}
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return string(pathbuf[:w])
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}
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// syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
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func syscallMode(i fs.FileMode) (o uint32) {
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o |= uint32(i.Perm())
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if i&fs.ModeSetuid != 0 {
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o |= syscall.S_ISUID
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}
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if i&fs.ModeSetgid != 0 {
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o |= syscall.S_ISGID
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}
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if i&fs.ModeSticky != 0 {
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o |= syscall.S_ISVTX
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}
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// No mapping for Go's ModeTemporary (plan9 only).
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return
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}
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func syscallOpen(path string, mode int, perm uint32) (fd syscall.Handle, err error) {
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if len(path) == 0 {
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return syscall.InvalidHandle, syscall.ERROR_FILE_NOT_FOUND
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}
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pathp, err := syscall.UTF16PtrFromString(path)
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if err != nil {
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return syscall.InvalidHandle, err
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}
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var access uint32
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switch mode & (syscall.O_RDONLY | syscall.O_WRONLY | syscall.O_RDWR) {
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case syscall.O_RDONLY:
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access = syscall.GENERIC_READ
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case syscall.O_WRONLY:
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access = syscall.GENERIC_WRITE
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case syscall.O_RDWR:
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access = syscall.GENERIC_READ | syscall.GENERIC_WRITE
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}
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if mode&syscall.O_CREAT != 0 {
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access |= syscall.GENERIC_WRITE
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}
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if mode&syscall.O_APPEND != 0 {
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access &^= syscall.GENERIC_WRITE
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access |= syscall.FILE_APPEND_DATA
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}
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sharemode := uint32(syscall.FILE_SHARE_READ | syscall.FILE_SHARE_WRITE | syscall.FILE_SHARE_DELETE)
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var createmode uint32
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switch {
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case mode&(syscall.O_CREAT|syscall.O_EXCL) == (syscall.O_CREAT | syscall.O_EXCL):
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createmode = syscall.CREATE_NEW
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case mode&(syscall.O_CREAT|syscall.O_TRUNC) == (syscall.O_CREAT | syscall.O_TRUNC):
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createmode = syscall.CREATE_ALWAYS
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case mode&syscall.O_CREAT == syscall.O_CREAT:
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createmode = syscall.OPEN_ALWAYS
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case mode&syscall.O_TRUNC == syscall.O_TRUNC:
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createmode = syscall.TRUNCATE_EXISTING
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default:
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createmode = syscall.OPEN_EXISTING
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}
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var attrs uint32 = syscall.FILE_ATTRIBUTE_NORMAL
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if perm&syscall.S_IWRITE == 0 {
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attrs = syscall.FILE_ATTRIBUTE_READONLY
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}
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h, e := syscall.CreateFile(pathp, access, sharemode, nil, createmode, attrs, 0)
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return h, e
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}
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@@ -9,8 +9,24 @@ import (
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"golang.org/x/sys/windows"
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)
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// OpenFile is a simplified copy of [os.openFileNolog]
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// that uses syscall.FILE_SHARE_DELETE.
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// https://go.dev/src/os/file_windows.go
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//
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// See: https://go.dev/issue/32088
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func (vfsOSMethods) OpenFile(name string, flag int, perm fs.FileMode) (*os.File, error) {
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return osOpenFile(name, flag, perm)
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if name == "" {
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return nil, &os.PathError{Op: "open", Path: name, Err: syscall.ENOENT}
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}
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r, e := syscallOpen(name, flag, uint32(perm.Perm()))
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if e != nil {
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return nil, &os.PathError{Op: "open", Path: name, Err: e}
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}
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return os.NewFile(uintptr(r), name), nil
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}
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func (vfsOSMethods) Sync(file *os.File) error {
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return file.Sync()
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}
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func (vfsOSMethods) Access(path string, flags _AccessFlag) (bool, xErrorCode) {
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@@ -149,3 +165,55 @@ func (vfsOSMethods) lockErrorCode(err error, def xErrorCode) xErrorCode {
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}
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return def
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}
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// syscallOpen is a simplified copy of [syscall.Open]
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// that uses syscall.FILE_SHARE_DELETE.
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// https://go.dev/src/syscall/syscall_windows.go
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func syscallOpen(path string, mode int, perm uint32) (fd syscall.Handle, err error) {
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if len(path) == 0 {
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return syscall.InvalidHandle, syscall.ERROR_FILE_NOT_FOUND
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}
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pathp, err := syscall.UTF16PtrFromString(path)
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if err != nil {
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return syscall.InvalidHandle, err
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}
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var access uint32
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switch mode & (syscall.O_RDONLY | syscall.O_WRONLY | syscall.O_RDWR) {
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case syscall.O_RDONLY:
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access = syscall.GENERIC_READ
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case syscall.O_WRONLY:
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access = syscall.GENERIC_WRITE
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case syscall.O_RDWR:
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access = syscall.GENERIC_READ | syscall.GENERIC_WRITE
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}
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if mode&syscall.O_CREAT != 0 {
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access |= syscall.GENERIC_WRITE
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}
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if mode&syscall.O_APPEND != 0 {
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access &^= syscall.GENERIC_WRITE
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access |= syscall.FILE_APPEND_DATA
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}
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sharemode := uint32(syscall.FILE_SHARE_READ | syscall.FILE_SHARE_WRITE | syscall.FILE_SHARE_DELETE)
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var createmode uint32
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switch {
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case mode&(syscall.O_CREAT|syscall.O_EXCL) == (syscall.O_CREAT | syscall.O_EXCL):
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createmode = syscall.CREATE_NEW
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case mode&(syscall.O_CREAT|syscall.O_TRUNC) == (syscall.O_CREAT | syscall.O_TRUNC):
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createmode = syscall.CREATE_ALWAYS
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case mode&syscall.O_CREAT == syscall.O_CREAT:
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createmode = syscall.OPEN_ALWAYS
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case mode&syscall.O_TRUNC == syscall.O_TRUNC:
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createmode = syscall.TRUNCATE_EXISTING
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default:
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createmode = syscall.OPEN_EXISTING
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}
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var attrs uint32 = syscall.FILE_ATTRIBUTE_NORMAL
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if perm&syscall.S_IWRITE == 0 {
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attrs = syscall.FILE_ATTRIBUTE_READONLY
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}
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if createmode == syscall.OPEN_EXISTING && access == syscall.GENERIC_READ {
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// Necessary for opening directory handles.
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attrs |= syscall.FILE_FLAG_BACKUP_SEMANTICS
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}
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return syscall.CreateFile(pathp, access, sharemode, nil, createmode, attrs, 0)
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}
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