| // Copyright 2018 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. |
| |
| package tcp |
| |
| import ( |
| "reflect" |
| "unsafe" |
| ) |
| |
| // optionsToArray converts a slice of capacity >-= maxOptionSize to an array. |
| // |
| // optionsToArray panics if the capacity of options is smaller than |
| // maxOptionSize. |
| func optionsToArray(options []byte) *[maxOptionSize]byte { |
| // Reslice to full capacity. |
| options = options[0:maxOptionSize] |
| return (*[maxOptionSize]byte)(unsafe.Pointer((*reflect.SliceHeader)(unsafe.Pointer(&options)).Data)) |
| } |
