mirror of
https://github.com/xiaoqidun/ofdgo.git
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82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package file
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import (
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"unsafe"
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)
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// replaceFileProc 保留目标文件属性并替换文件内容
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var replaceFileProc = syscall.NewLazyDLL("kernel32.dll").NewProc("ReplaceFileW")
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// Open 保留替换共享权限，路径替换后已有读取句柄仍有效
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// 入参: name 文件路径
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// 返回: *os.File 文件, error 打开错误
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func Open(name string) (*os.File, error) {
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path, err := nativePath(name)
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if err != nil {
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return nil, err
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}
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handle, err := syscall.CreateFile(path, syscall.GENERIC_READ, syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE, nil, syscall.OPEN_EXISTING, syscall.FILE_ATTRIBUTE_NORMAL, 0)
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if err != nil {
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return nil, &os.PathError{Op: "open", Path: name, Err: err}
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}
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return os.NewFile(uintptr(handle), name), nil
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}
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// Replace 替换目标，目标不存在时重命名
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// 入参: source 临时路径, target 目标路径
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// 返回: error 替换错误
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func Replace(source, target string) error {
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from, err := nativePath(source)
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if err != nil {
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return err
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}
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to, err := nativePath(target)
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if err != nil {
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return err
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}
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result, _, err := replaceFileProc.Call(uintptr(unsafe.Pointer(to)), uintptr(unsafe.Pointer(from)), 0, 0, 0, 0)
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if result != 0 {
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return nil
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}
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if err == syscall.ERROR_FILE_NOT_FOUND {
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return os.Rename(source, target)
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}
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return &os.LinkError{Op: "replace", Old: source, New: target, Err: err}
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}
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// nativePath 转换绝对长路径
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// 入参: name 路径
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// 返回: *uint16 原生路径, error 转换错误
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func nativePath(name string) (*uint16, error) {
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path, err := filepath.Abs(name)
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if err != nil {
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return nil, err
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}
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if !strings.HasPrefix(path, `\\?\`) {
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if strings.HasPrefix(path, `\\`) {
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path = `\\?\UNC\` + path[2:]
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} else {
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path = `\\?\` + path
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}
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}
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return syscall.UTF16PtrFromString(path)
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}
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