103 lines
3.5 KiB
Go
103 lines
3.5 KiB
Go
//go:build windows
|
|
// +build windows
|
|
|
|
package file
|
|
|
|
import (
|
|
"errors"
|
|
"os"
|
|
"path/filepath"
|
|
"regexp"
|
|
"syscall"
|
|
)
|
|
|
|
// OpenFile is the generalized open call; most users will use Open or Create
|
|
// instead. It opens the named file with specified flag (O_RDONLY etc.) and
|
|
// perm (before umask), if applicable. If successful, methods on the returned
|
|
// File can be used for I/O. If there is an error, it will be of type
|
|
// *PathError.
|
|
//
|
|
// Under both Unix and Windows this will allow open files to be
|
|
// renamed and or deleted.
|
|
func OpenFile(path string, mode int, perm os.FileMode) (*os.File, error) {
|
|
// This code copied from syscall_windows.go in the go source and then
|
|
// modified to support renaming and deleting open files by adding
|
|
// FILE_SHARE_DELETE.
|
|
//
|
|
// https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-createfilea#file_share_delete
|
|
if len(path) == 0 {
|
|
return nil, syscall.ERROR_FILE_NOT_FOUND
|
|
}
|
|
pathp, err := syscall.UTF16PtrFromString(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var access uint32
|
|
switch mode & (syscall.O_RDONLY | syscall.O_WRONLY | syscall.O_RDWR) {
|
|
case syscall.O_RDONLY:
|
|
access = syscall.GENERIC_READ
|
|
case syscall.O_WRONLY:
|
|
access = syscall.GENERIC_WRITE
|
|
case syscall.O_RDWR:
|
|
access = syscall.GENERIC_READ | syscall.GENERIC_WRITE
|
|
}
|
|
if mode&syscall.O_CREAT != 0 {
|
|
access |= syscall.GENERIC_WRITE
|
|
}
|
|
if mode&syscall.O_APPEND != 0 {
|
|
access &^= syscall.GENERIC_WRITE
|
|
access |= syscall.FILE_APPEND_DATA
|
|
}
|
|
sharemode := uint32(syscall.FILE_SHARE_READ | syscall.FILE_SHARE_WRITE | syscall.FILE_SHARE_DELETE)
|
|
var createmode uint32
|
|
switch {
|
|
case mode&(syscall.O_CREAT|syscall.O_EXCL) == (syscall.O_CREAT | syscall.O_EXCL):
|
|
createmode = syscall.CREATE_NEW
|
|
case mode&(syscall.O_CREAT|syscall.O_TRUNC) == (syscall.O_CREAT | syscall.O_TRUNC):
|
|
createmode = syscall.CREATE_ALWAYS
|
|
case mode&syscall.O_CREAT == syscall.O_CREAT:
|
|
createmode = syscall.OPEN_ALWAYS
|
|
case mode&syscall.O_TRUNC == syscall.O_TRUNC:
|
|
createmode = syscall.TRUNCATE_EXISTING
|
|
default:
|
|
createmode = syscall.OPEN_EXISTING
|
|
}
|
|
h, e := syscall.CreateFile(pathp, access, sharemode, nil, createmode, syscall.FILE_ATTRIBUTE_NORMAL, 0)
|
|
if e != nil {
|
|
return nil, e
|
|
}
|
|
return os.NewFile(uintptr(h), path), nil
|
|
}
|
|
|
|
// IsReserved checks if path contains a reserved name
|
|
func IsReserved(path string) error {
|
|
if path == "" {
|
|
return errors.New("path is empty")
|
|
}
|
|
base := filepath.Base(path)
|
|
// If the path is empty or reduces to ".", Base returns ".".
|
|
if base == "." {
|
|
return errors.New("path is '.'")
|
|
}
|
|
// If the path consists entirely of separators, Base returns a single separator.
|
|
if base == string(filepath.Separator) {
|
|
return errors.New("path consists entirely of separators")
|
|
}
|
|
// Do not end a file or directory name with a space or a period. Although the underlying
|
|
// file system may support such names, the Windows shell and user interface does not.
|
|
// (https://docs.microsoft.com/en-gb/windows/win32/fileio/naming-a-file)
|
|
suffix := base[len(base)-1]
|
|
switch suffix {
|
|
case ' ':
|
|
return errors.New("base file name ends with a space")
|
|
case '.':
|
|
return errors.New("base file name ends with a period")
|
|
}
|
|
// Do not use names of legacy (DOS) devices, not even as basename without extension,
|
|
// as this will refer to the actual device.
|
|
// (https://docs.microsoft.com/en-gb/windows/win32/fileio/naming-a-file)
|
|
if reserved, _ := regexp.MatchString(`^(?i:con|prn|aux|nul|com[1-9]|lpt[1-9])(?:\.|$)`, base); reserved {
|
|
return errors.New("base file name is reserved windows device name (CON, PRN, AUX, NUL, COM[1-9], LPT[1-9])")
|
|
}
|
|
return nil
|
|
}
|