mirror of
https://github.com/cwinfo/matterbridge.git
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385 lines
11 KiB
Go
385 lines
11 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package registry
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import (
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"errors"
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"io"
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"syscall"
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"unicode/utf16"
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"unsafe"
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)
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const (
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// Registry value types.
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NONE = 0
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SZ = 1
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EXPAND_SZ = 2
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BINARY = 3
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DWORD = 4
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DWORD_BIG_ENDIAN = 5
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LINK = 6
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MULTI_SZ = 7
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RESOURCE_LIST = 8
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FULL_RESOURCE_DESCRIPTOR = 9
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RESOURCE_REQUIREMENTS_LIST = 10
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QWORD = 11
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)
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var (
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// ErrShortBuffer is returned when the buffer was too short for the operation.
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ErrShortBuffer = syscall.ERROR_MORE_DATA
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// ErrNotExist is returned when a registry key or value does not exist.
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ErrNotExist = syscall.ERROR_FILE_NOT_FOUND
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// ErrUnexpectedType is returned by Get*Value when the value's type was unexpected.
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ErrUnexpectedType = errors.New("unexpected key value type")
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)
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// GetValue retrieves the type and data for the specified value associated
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// with an open key k. It fills up buffer buf and returns the retrieved
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// byte count n. If buf is too small to fit the stored value it returns
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// ErrShortBuffer error along with the required buffer size n.
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// If no buffer is provided, it returns true and actual buffer size n.
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// If no buffer is provided, GetValue returns the value's type only.
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// If the value does not exist, the error returned is ErrNotExist.
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//
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// GetValue is a low level function. If value's type is known, use the appropriate
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// Get*Value function instead.
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func (k Key) GetValue(name string, buf []byte) (n int, valtype uint32, err error) {
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pname, err := syscall.UTF16PtrFromString(name)
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if err != nil {
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return 0, 0, err
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}
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var pbuf *byte
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if len(buf) > 0 {
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pbuf = (*byte)(unsafe.Pointer(&buf[0]))
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}
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l := uint32(len(buf))
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err = syscall.RegQueryValueEx(syscall.Handle(k), pname, nil, &valtype, pbuf, &l)
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if err != nil {
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return int(l), valtype, err
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}
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return int(l), valtype, nil
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}
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func (k Key) getValue(name string, buf []byte) (date []byte, valtype uint32, err error) {
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p, err := syscall.UTF16PtrFromString(name)
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if err != nil {
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return nil, 0, err
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}
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var t uint32
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n := uint32(len(buf))
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for {
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err = syscall.RegQueryValueEx(syscall.Handle(k), p, nil, &t, (*byte)(unsafe.Pointer(&buf[0])), &n)
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if err == nil {
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return buf[:n], t, nil
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}
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if err != syscall.ERROR_MORE_DATA {
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return nil, 0, err
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}
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if n <= uint32(len(buf)) {
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return nil, 0, err
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}
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buf = make([]byte, n)
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}
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}
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// GetStringValue retrieves the string value for the specified
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// value name associated with an open key k. It also returns the value's type.
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// If value does not exist, GetStringValue returns ErrNotExist.
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// If value is not SZ or EXPAND_SZ, it will return the correct value
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// type and ErrUnexpectedType.
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func (k Key) GetStringValue(name string) (val string, valtype uint32, err error) {
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data, typ, err2 := k.getValue(name, make([]byte, 64))
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if err2 != nil {
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return "", typ, err2
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}
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switch typ {
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case SZ, EXPAND_SZ:
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default:
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return "", typ, ErrUnexpectedType
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}
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if len(data) == 0 {
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return "", typ, nil
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}
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u := (*[1 << 29]uint16)(unsafe.Pointer(&data[0]))[:]
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return syscall.UTF16ToString(u), typ, nil
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}
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// GetMUIStringValue retrieves the localized string value for
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// the specified value name associated with an open key k.
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// If the value name doesn't exist or the localized string value
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// can't be resolved, GetMUIStringValue returns ErrNotExist.
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// GetMUIStringValue panics if the system doesn't support
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// regLoadMUIString; use LoadRegLoadMUIString to check if
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// regLoadMUIString is supported before calling this function.
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func (k Key) GetMUIStringValue(name string) (string, error) {
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pname, err := syscall.UTF16PtrFromString(name)
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if err != nil {
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return "", err
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}
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buf := make([]uint16, 1024)
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var buflen uint32
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var pdir *uint16
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err = regLoadMUIString(syscall.Handle(k), pname, &buf[0], uint32(len(buf)), &buflen, 0, pdir)
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if err == syscall.ERROR_FILE_NOT_FOUND { // Try fallback path
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// Try to resolve the string value using the system directory as
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// a DLL search path; this assumes the string value is of the form
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// @[path]\dllname,-strID but with no path given, e.g. @tzres.dll,-320.
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// This approach works with tzres.dll but may have to be revised
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// in the future to allow callers to provide custom search paths.
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var s string
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s, err = ExpandString("%SystemRoot%\\system32\\")
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if err != nil {
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return "", err
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}
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pdir, err = syscall.UTF16PtrFromString(s)
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if err != nil {
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return "", err
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}
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err = regLoadMUIString(syscall.Handle(k), pname, &buf[0], uint32(len(buf)), &buflen, 0, pdir)
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}
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for err == syscall.ERROR_MORE_DATA { // Grow buffer if needed
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if buflen <= uint32(len(buf)) {
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break // Buffer not growing, assume race; break
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}
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buf = make([]uint16, buflen)
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err = regLoadMUIString(syscall.Handle(k), pname, &buf[0], uint32(len(buf)), &buflen, 0, pdir)
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}
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if err != nil {
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return "", err
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}
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return syscall.UTF16ToString(buf), nil
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}
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// ExpandString expands environment-variable strings and replaces
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// them with the values defined for the current user.
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// Use ExpandString to expand EXPAND_SZ strings.
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func ExpandString(value string) (string, error) {
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if value == "" {
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return "", nil
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}
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p, err := syscall.UTF16PtrFromString(value)
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if err != nil {
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return "", err
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}
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r := make([]uint16, 100)
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for {
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n, err := expandEnvironmentStrings(p, &r[0], uint32(len(r)))
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if err != nil {
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return "", err
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}
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if n <= uint32(len(r)) {
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u := (*[1 << 29]uint16)(unsafe.Pointer(&r[0]))[:]
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return syscall.UTF16ToString(u), nil
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}
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r = make([]uint16, n)
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}
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}
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// GetStringsValue retrieves the []string value for the specified
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// value name associated with an open key k. It also returns the value's type.
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// If value does not exist, GetStringsValue returns ErrNotExist.
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// If value is not MULTI_SZ, it will return the correct value
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// type and ErrUnexpectedType.
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func (k Key) GetStringsValue(name string) (val []string, valtype uint32, err error) {
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data, typ, err2 := k.getValue(name, make([]byte, 64))
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if err2 != nil {
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return nil, typ, err2
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}
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if typ != MULTI_SZ {
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return nil, typ, ErrUnexpectedType
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}
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if len(data) == 0 {
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return nil, typ, nil
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}
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p := (*[1 << 29]uint16)(unsafe.Pointer(&data[0]))[:len(data)/2]
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if len(p) == 0 {
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return nil, typ, nil
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}
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if p[len(p)-1] == 0 {
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p = p[:len(p)-1] // remove terminating null
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}
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val = make([]string, 0, 5)
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from := 0
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for i, c := range p {
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if c == 0 {
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val = append(val, string(utf16.Decode(p[from:i])))
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from = i + 1
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}
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}
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return val, typ, nil
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}
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// GetIntegerValue retrieves the integer value for the specified
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// value name associated with an open key k. It also returns the value's type.
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// If value does not exist, GetIntegerValue returns ErrNotExist.
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// If value is not DWORD or QWORD, it will return the correct value
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// type and ErrUnexpectedType.
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func (k Key) GetIntegerValue(name string) (val uint64, valtype uint32, err error) {
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data, typ, err2 := k.getValue(name, make([]byte, 8))
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if err2 != nil {
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return 0, typ, err2
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}
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switch typ {
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case DWORD:
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if len(data) != 4 {
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return 0, typ, errors.New("DWORD value is not 4 bytes long")
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}
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return uint64(*(*uint32)(unsafe.Pointer(&data[0]))), DWORD, nil
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case QWORD:
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if len(data) != 8 {
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return 0, typ, errors.New("QWORD value is not 8 bytes long")
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}
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return uint64(*(*uint64)(unsafe.Pointer(&data[0]))), QWORD, nil
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default:
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return 0, typ, ErrUnexpectedType
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}
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}
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// GetBinaryValue retrieves the binary value for the specified
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// value name associated with an open key k. It also returns the value's type.
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// If value does not exist, GetBinaryValue returns ErrNotExist.
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// If value is not BINARY, it will return the correct value
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// type and ErrUnexpectedType.
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func (k Key) GetBinaryValue(name string) (val []byte, valtype uint32, err error) {
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data, typ, err2 := k.getValue(name, make([]byte, 64))
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if err2 != nil {
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return nil, typ, err2
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}
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if typ != BINARY {
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return nil, typ, ErrUnexpectedType
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}
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return data, typ, nil
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}
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func (k Key) setValue(name string, valtype uint32, data []byte) error {
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p, err := syscall.UTF16PtrFromString(name)
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if err != nil {
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return err
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}
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if len(data) == 0 {
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return regSetValueEx(syscall.Handle(k), p, 0, valtype, nil, 0)
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}
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return regSetValueEx(syscall.Handle(k), p, 0, valtype, &data[0], uint32(len(data)))
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}
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// SetDWordValue sets the data and type of a name value
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// under key k to value and DWORD.
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func (k Key) SetDWordValue(name string, value uint32) error {
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return k.setValue(name, DWORD, (*[4]byte)(unsafe.Pointer(&value))[:])
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}
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// SetQWordValue sets the data and type of a name value
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// under key k to value and QWORD.
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func (k Key) SetQWordValue(name string, value uint64) error {
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return k.setValue(name, QWORD, (*[8]byte)(unsafe.Pointer(&value))[:])
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}
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func (k Key) setStringValue(name string, valtype uint32, value string) error {
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v, err := syscall.UTF16FromString(value)
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if err != nil {
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return err
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}
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buf := (*[1 << 29]byte)(unsafe.Pointer(&v[0]))[:len(v)*2]
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return k.setValue(name, valtype, buf)
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}
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// SetStringValue sets the data and type of a name value
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// under key k to value and SZ. The value must not contain a zero byte.
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func (k Key) SetStringValue(name, value string) error {
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return k.setStringValue(name, SZ, value)
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}
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// SetExpandStringValue sets the data and type of a name value
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// under key k to value and EXPAND_SZ. The value must not contain a zero byte.
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func (k Key) SetExpandStringValue(name, value string) error {
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return k.setStringValue(name, EXPAND_SZ, value)
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}
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// SetStringsValue sets the data and type of a name value
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// under key k to value and MULTI_SZ. The value strings
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// must not contain a zero byte.
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func (k Key) SetStringsValue(name string, value []string) error {
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ss := ""
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for _, s := range value {
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for i := 0; i < len(s); i++ {
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if s[i] == 0 {
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return errors.New("string cannot have 0 inside")
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}
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}
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ss += s + "\x00"
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}
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v := utf16.Encode([]rune(ss + "\x00"))
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buf := (*[1 << 29]byte)(unsafe.Pointer(&v[0]))[:len(v)*2]
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return k.setValue(name, MULTI_SZ, buf)
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}
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// SetBinaryValue sets the data and type of a name value
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// under key k to value and BINARY.
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func (k Key) SetBinaryValue(name string, value []byte) error {
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return k.setValue(name, BINARY, value)
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}
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// DeleteValue removes a named value from the key k.
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func (k Key) DeleteValue(name string) error {
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return regDeleteValue(syscall.Handle(k), syscall.StringToUTF16Ptr(name))
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}
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// ReadValueNames returns the value names of key k.
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// The parameter n controls the number of returned names,
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// analogous to the way os.File.Readdirnames works.
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func (k Key) ReadValueNames(n int) ([]string, error) {
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ki, err := k.Stat()
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if err != nil {
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return nil, err
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}
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names := make([]string, 0, ki.ValueCount)
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buf := make([]uint16, ki.MaxValueNameLen+1) // extra room for terminating null character
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loopItems:
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for i := uint32(0); ; i++ {
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if n > 0 {
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if len(names) == n {
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return names, nil
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}
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}
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l := uint32(len(buf))
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for {
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err := regEnumValue(syscall.Handle(k), i, &buf[0], &l, nil, nil, nil, nil)
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if err == nil {
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break
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}
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if err == syscall.ERROR_MORE_DATA {
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// Double buffer size and try again.
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l = uint32(2 * len(buf))
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buf = make([]uint16, l)
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continue
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}
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if err == _ERROR_NO_MORE_ITEMS {
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break loopItems
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}
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return names, err
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}
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names = append(names, syscall.UTF16ToString(buf[:l]))
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}
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if n > len(names) {
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return names, io.EOF
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}
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return names, nil
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}
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