func ReadFileContents(fileName string) (string, error) {
file, err := wrappers.CreateFile(
syscall.StringToUTF16Ptr(fileName),
wrappers.GENERIC_READ,
wrappers.FILE_SHARE_READ|wrappers.FILE_SHARE_WRITE|wrappers.FILE_SHARE_DELETE,
nil,
wrappers.OPEN_EXISTING,
0,
0)
if err != nil {
return "", NewWindowsError("CreateFile", err)
}
defer wrappers.CloseHandle(file)
size, err := wrappers.GetFileSize(file, nil)
if err != nil {
return "", NewWindowsError("GetFileSize", err)
}
if size == 0 {
return "", nil
}
buf := make([]byte, size)
var bytesRead uint32
if err := wrappers.ReadFile(file, &buf[0], size, &bytesRead, nil); err != nil {
return "", NewWindowsError("ReadFile", err)
}
return string(buf[0:bytesRead]), nil
}
func GetSymbolicLink(symlinkPath string) (*SymbolicLinkData, error) {
file, err := wrappers.CreateFile(
syscall.StringToUTF16Ptr(symlinkPath),
wrappers.FILE_READ_EA,
wrappers.FILE_SHARE_READ|wrappers.FILE_SHARE_WRITE|wrappers.FILE_SHARE_DELETE,
nil,
wrappers.OPEN_EXISTING,
wrappers.FILE_FLAG_OPEN_REPARSE_POINT|wrappers.FILE_FLAG_BACKUP_SEMANTICS,
0)
if err != nil {
return nil, NewWindowsError("CreateFile", err)
}
defer wrappers.CloseHandle(file)
buf := make([]byte, wrappers.MAXIMUM_REPARSE_DATA_BUFFER_SIZE)
var bytesReturned uint32
err = wrappers.DeviceIoControl(
file,
wrappers.FSCTL_GET_REPARSE_POINT,
nil,
0,
&buf[0],
wrappers.MAXIMUM_REPARSE_DATA_BUFFER_SIZE,
&bytesReturned,
nil)
if err != nil {
return nil, NewWindowsError("DeviceIoControl", err)
}
data := (*wrappers.REPARSE_DATA_BUFFER)(unsafe.Pointer(&buf[0]))
if data.ReparseTag != wrappers.IO_REPARSE_TAG_SYMLINK {
return nil, nil
}
substituteNameBuf := make([]uint16, data.SubstituteNameLength/2)
printNameBuf := make([]uint16, data.PrintNameLength/2)
wrappers.RtlMoveMemory(
(*byte)(unsafe.Pointer(&substituteNameBuf[0])),
&buf[unsafe.Sizeof(*data)+uintptr(data.SubstituteNameOffset)],
uintptr(data.SubstituteNameLength))
wrappers.RtlMoveMemory(
(*byte)(unsafe.Pointer(&printNameBuf[0])),
&buf[unsafe.Sizeof(*data)+uintptr(data.PrintNameOffset)],
uintptr(data.PrintNameLength))
return &SymbolicLinkData{
SubstituteName: syscall.UTF16ToString(substituteNameBuf),
PrintName: syscall.UTF16ToString(printNameBuf),
Relative: (data.Flags & wrappers.SYMLINK_FLAG_RELATIVE) != 0,
}, nil
}
func OpenWindowsFile(fileName string, readWrite bool, shareMode FileShareMode, creationDisposition FileCreationDisposition, attributes FileAttributes, flags FileFlags) (*os.File, error) {
var accessMask uint32 = wrappers.GENERIC_READ
if readWrite {
accessMask |= wrappers.GENERIC_WRITE
}
file, err := wrappers.CreateFile(
syscall.StringToUTF16Ptr(fileName),
accessMask,
uint32(shareMode),
nil,
uint32(creationDisposition),
uint32(attributes)|uint32(flags),
0)
if err != nil {
return nil, NewWindowsError("CreateFile", err)
}
return os.NewFile(uintptr(file), fileName), nil
}
func GetDiskPerformanceInfo(rootPathName string) (*DiskPerformanceInfo, error) {
hFile, err := wrappers.CreateFile(
syscall.StringToUTF16Ptr(rootPathName),
0,
wrappers.FILE_SHARE_READ|wrappers.FILE_SHARE_WRITE,
nil,
wrappers.OPEN_EXISTING,
0,
0)
if err != nil {
return nil, NewWindowsError("CreateFile", err)
}
defer wrappers.CloseHandle(hFile)
var diskPerformance wrappers.DISK_PERFORMANCE
var diskPerformanceSize uint32
err = wrappers.DeviceIoControl(
hFile,
wrappers.IOCTL_DISK_PERFORMANCE,
nil,
0,
(*byte)(unsafe.Pointer(&diskPerformance)),
uint32(unsafe.Sizeof(diskPerformance)),
&diskPerformanceSize,
nil)
if err != nil {
return nil, NewWindowsError("DeviceIoControl", err)
}
return &DiskPerformanceInfo{
BytesRead: diskPerformance.BytesRead,
BytesWritten: diskPerformance.BytesWritten,
ReadTime: diskPerformance.ReadTime,
WriteTime: diskPerformance.WriteTime,
IdleTime: diskPerformance.IdleTime,
ReadCount: uint(diskPerformance.ReadCount),
WriteCount: uint(diskPerformance.WriteCount),
QueueDepth: uint(diskPerformance.QueueDepth),
SplitCount: uint(diskPerformance.SplitCount),
QueryTime: diskPerformance.QueryTime,
StorageDeviceNumber: uint(diskPerformance.StorageDeviceNumber),
StorageManagerName: syscall.UTF16ToString(diskPerformance.StorageManagerName[:]),
}, nil
}