90 lines
2.7 KiB
Go
90 lines
2.7 KiB
Go
// Copyright 2016 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 darwin dragonfly freebsd netbsd openbsd
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package route
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// This file contains duplicates of encoding/binary package.
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//
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// This package is supposed to be used by the net package of standard
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// library. Therefore a package set used in the package must be the
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// same as net package.
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var (
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littleEndian binaryLittleEndian
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bigEndian binaryBigEndian
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)
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type binaryByteOrder interface {
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Uint16([]byte) uint16
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Uint32([]byte) uint32
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PutUint16([]byte, uint16)
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PutUint32([]byte, uint32)
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Uint64([]byte) uint64
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}
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type binaryLittleEndian struct{}
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func (binaryLittleEndian) Uint16(b []byte) uint16 {
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_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
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return uint16(b[0]) | uint16(b[1])<<8
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}
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func (binaryLittleEndian) PutUint16(b []byte, v uint16) {
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_ = b[1] // early bounds check to guarantee safety of writes below
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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}
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func (binaryLittleEndian) Uint32(b []byte) uint32 {
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_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
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return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
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}
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func (binaryLittleEndian) PutUint32(b []byte, v uint32) {
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_ = b[3] // early bounds check to guarantee safety of writes below
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b[0] = byte(v)
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b[1] = byte(v >> 8)
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b[2] = byte(v >> 16)
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b[3] = byte(v >> 24)
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}
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func (binaryLittleEndian) Uint64(b []byte) uint64 {
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_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
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uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
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}
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type binaryBigEndian struct{}
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func (binaryBigEndian) Uint16(b []byte) uint16 {
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_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
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return uint16(b[1]) | uint16(b[0])<<8
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}
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func (binaryBigEndian) PutUint16(b []byte, v uint16) {
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_ = b[1] // early bounds check to guarantee safety of writes below
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b[0] = byte(v >> 8)
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b[1] = byte(v)
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}
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func (binaryBigEndian) Uint32(b []byte) uint32 {
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_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
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return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
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}
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func (binaryBigEndian) PutUint32(b []byte, v uint32) {
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_ = b[3] // early bounds check to guarantee safety of writes below
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b[0] = byte(v >> 24)
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b[1] = byte(v >> 16)
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b[2] = byte(v >> 8)
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b[3] = byte(v)
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}
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func (binaryBigEndian) Uint64(b []byte) uint64 {
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_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
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return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
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uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
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}
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