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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package windows
import (
"syscall"
"unsafe"
)
const (
FSCTL_SET_REPARSE_POINT = 0x000900A4
IO_REPARSE_TAG_MOUNT_POINT = 0xA0000003
SYMLINK_FLAG_RELATIVE = 1
)
// These structures are described
// in https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-fscc/ca069dad-ed16-42aa-b057-b6b207f447cc
// and https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-fscc/b41f1cbf-10df-4a47-98d4-1c52a833d913.
type REPARSE_DATA_BUFFER struct {
ReparseTag uint32
ReparseDataLength uint16
Reserved uint16
DUMMYUNIONNAME byte
}
// REPARSE_DATA_BUFFER_HEADER is a common part of REPARSE_DATA_BUFFER structure.
type REPARSE_DATA_BUFFER_HEADER struct {
ReparseTag uint32
// The size, in bytes, of the reparse data that follows
// the common portion of the REPARSE_DATA_BUFFER element.
// This value is the length of the data starting at the
// SubstituteNameOffset field.
ReparseDataLength uint16
Reserved uint16
}
type SymbolicLinkReparseBuffer struct {
// The integer that contains the offset, in bytes,
// of the substitute name string in the PathBuffer array,
// computed as an offset from byte 0 of PathBuffer. Note that
// this offset must be divided by 2 to get the array index.
SubstituteNameOffset uint16
// The integer that contains the length, in bytes, of the
// substitute name string. If this string is null-terminated,
// SubstituteNameLength does not include the Unicode null character.
SubstituteNameLength uint16
// PrintNameOffset is similar to SubstituteNameOffset.
PrintNameOffset uint16
// PrintNameLength is similar to SubstituteNameLength.
PrintNameLength uint16
// Flags specifies whether the substitute name is a full path name or
// a path name relative to the directory containing the symbolic link.
Flags uint32
PathBuffer [1]uint16
}
// Path returns path stored in rb.
func (rb *SymbolicLinkReparseBuffer) Path() string {
n1 := rb.SubstituteNameOffset / 2
n2 := (rb.SubstituteNameOffset + rb.SubstituteNameLength) / 2
return syscall.UTF16ToString((*[0xffff]uint16)(unsafe.Pointer(&rb.PathBuffer[0]))[n1:n2:n2])
}
type MountPointReparseBuffer struct {
// The integer that contains the offset, in bytes,
// of the substitute name string in the PathBuffer array,
// computed as an offset from byte 0 of PathBuffer. Note that
// this offset must be divided by 2 to get the array index.
SubstituteNameOffset uint16
// The integer that contains the length, in bytes, of the
// substitute name string. If this string is null-terminated,
// SubstituteNameLength does not include the Unicode null character.
SubstituteNameLength uint16
// PrintNameOffset is similar to SubstituteNameOffset.
PrintNameOffset uint16
// PrintNameLength is similar to SubstituteNameLength.
PrintNameLength uint16
PathBuffer [1]uint16
}
// Path returns path stored in rb.
func (rb *MountPointReparseBuffer) Path() string {
n1 := rb.SubstituteNameOffset / 2
n2 := (rb.SubstituteNameOffset + rb.SubstituteNameLength) / 2
return syscall.UTF16ToString((*[0xffff]uint16)(unsafe.Pointer(&rb.PathBuffer[0]))[n1:n2:n2])
}
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