2c4ae3b0a4
Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для неё не нужна. Module path github.com/sagernet/gvisor сохранён намеренно: на него опирается replace-директива суперпроекта. Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show и переносилась на новый пин копированием. SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH
51 lines
1.9 KiB
Go
51 lines
1.9 KiB
Go
// Copyright 2023 The gVisor Authors.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
//go:build go1.13 && !go1.20
|
|
// +build go1.13,!go1.20
|
|
|
|
// TODO(go.dev/issue/8422): Remove this file once Go 1.19 is no longer
|
|
// supported.
|
|
|
|
package gohacks
|
|
|
|
import (
|
|
"unsafe"
|
|
)
|
|
|
|
// stringHeader is equivalent to reflect.StringHeader, but represents the
|
|
// pointer to the underlying array as unsafe.Pointer rather than uintptr,
|
|
// allowing StringHeaders to be directly converted to strings.
|
|
type stringHeader struct {
|
|
Data unsafe.Pointer
|
|
Len int
|
|
}
|
|
|
|
// ImmutableBytesFromString is equivalent to []byte(s), except that it uses the
|
|
// same memory backing s instead of making a heap-allocated copy. This is only
|
|
// valid if the returned slice is never mutated.
|
|
func ImmutableBytesFromString(s string) []byte {
|
|
shdr := (*stringHeader)(unsafe.Pointer(&s))
|
|
return Slice((*byte)(shdr.Data), shdr.Len)
|
|
}
|
|
|
|
// StringFromImmutableBytes is equivalent to string(bs), except that it uses
|
|
// the same memory backing bs instead of making a heap-allocated copy. This is
|
|
// only valid if bs is never mutated after StringFromImmutableBytes returns.
|
|
func StringFromImmutableBytes(bs []byte) string {
|
|
// This is cheaper than messing with StringHeader and SliceHeader, which as
|
|
// of this writing produces many dead stores of zeroes. Compare
|
|
// strings.Builder.String().
|
|
return *(*string)(unsafe.Pointer(&bs))
|
|
}
|