forked from toolshed/abra
107 lines
3.5 KiB
Go
107 lines
3.5 KiB
Go
//go:build windows
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// +build windows
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package winio
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import (
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"os"
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"runtime"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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// FileBasicInfo contains file access time and file attributes information.
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type FileBasicInfo struct {
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CreationTime, LastAccessTime, LastWriteTime, ChangeTime windows.Filetime
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FileAttributes uint32
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_ uint32 // padding
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}
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// alignedFileBasicInfo is a FileBasicInfo, but aligned to uint64 by containing
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// uint64 rather than windows.Filetime. Filetime contains two uint32s. uint64
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// alignment is necessary to pass this as FILE_BASIC_INFO.
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type alignedFileBasicInfo struct {
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CreationTime, LastAccessTime, LastWriteTime, ChangeTime uint64
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FileAttributes uint32
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_ uint32 // padding
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}
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// GetFileBasicInfo retrieves times and attributes for a file.
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func GetFileBasicInfo(f *os.File) (*FileBasicInfo, error) {
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bi := &alignedFileBasicInfo{}
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if err := windows.GetFileInformationByHandleEx(
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windows.Handle(f.Fd()),
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windows.FileBasicInfo,
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(*byte)(unsafe.Pointer(bi)),
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uint32(unsafe.Sizeof(*bi)),
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); err != nil {
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return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
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}
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runtime.KeepAlive(f)
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// Reinterpret the alignedFileBasicInfo as a FileBasicInfo so it matches the
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// public API of this module. The data may be unnecessarily aligned.
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return (*FileBasicInfo)(unsafe.Pointer(bi)), nil
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}
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// SetFileBasicInfo sets times and attributes for a file.
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func SetFileBasicInfo(f *os.File, bi *FileBasicInfo) error {
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// Create an alignedFileBasicInfo based on a FileBasicInfo. The copy is
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// suitable to pass to GetFileInformationByHandleEx.
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biAligned := *(*alignedFileBasicInfo)(unsafe.Pointer(bi))
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if err := windows.SetFileInformationByHandle(
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windows.Handle(f.Fd()),
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windows.FileBasicInfo,
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(*byte)(unsafe.Pointer(&biAligned)),
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uint32(unsafe.Sizeof(biAligned)),
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); err != nil {
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return &os.PathError{Op: "SetFileInformationByHandle", Path: f.Name(), Err: err}
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}
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runtime.KeepAlive(f)
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return nil
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}
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// FileStandardInfo contains extended information for the file.
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// FILE_STANDARD_INFO in WinBase.h
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// https://docs.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-file_standard_info
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type FileStandardInfo struct {
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AllocationSize, EndOfFile int64
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NumberOfLinks uint32
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DeletePending, Directory bool
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}
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// GetFileStandardInfo retrieves ended information for the file.
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func GetFileStandardInfo(f *os.File) (*FileStandardInfo, error) {
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si := &FileStandardInfo{}
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if err := windows.GetFileInformationByHandleEx(windows.Handle(f.Fd()),
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windows.FileStandardInfo,
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(*byte)(unsafe.Pointer(si)),
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uint32(unsafe.Sizeof(*si))); err != nil {
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return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
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}
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runtime.KeepAlive(f)
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return si, nil
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}
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// FileIDInfo contains the volume serial number and file ID for a file. This pair should be
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// unique on a system.
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type FileIDInfo struct {
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VolumeSerialNumber uint64
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FileID [16]byte
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}
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// GetFileID retrieves the unique (volume, file ID) pair for a file.
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func GetFileID(f *os.File) (*FileIDInfo, error) {
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fileID := &FileIDInfo{}
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if err := windows.GetFileInformationByHandleEx(
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windows.Handle(f.Fd()),
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windows.FileIdInfo,
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(*byte)(unsafe.Pointer(fileID)),
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uint32(unsafe.Sizeof(*fileID)),
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); err != nil {
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return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
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}
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runtime.KeepAlive(f)
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return fileID, nil
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}
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