Source file src/vendor/golang.org/x/net/route/binary.go

     1	// Copyright 2016 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build darwin dragonfly freebsd netbsd openbsd
     6	
     7	package route
     8	
     9	// This file contains duplicates of encoding/binary package.
    10	//
    11	// This package is supposed to be used by the net package of standard
    12	// library. Therefore the package set used in the package must be the
    13	// same as net package.
    14	
    15	var (
    16		littleEndian binaryLittleEndian
    17		bigEndian    binaryBigEndian
    18	)
    19	
    20	type binaryByteOrder interface {
    21		Uint16([]byte) uint16
    22		Uint32([]byte) uint32
    23		PutUint16([]byte, uint16)
    24		PutUint32([]byte, uint32)
    25		Uint64([]byte) uint64
    26	}
    27	
    28	type binaryLittleEndian struct{}
    29	
    30	func (binaryLittleEndian) Uint16(b []byte) uint16 {
    31		_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
    32		return uint16(b[0]) | uint16(b[1])<<8
    33	}
    34	
    35	func (binaryLittleEndian) PutUint16(b []byte, v uint16) {
    36		_ = b[1] // early bounds check to guarantee safety of writes below
    37		b[0] = byte(v)
    38		b[1] = byte(v >> 8)
    39	}
    40	
    41	func (binaryLittleEndian) Uint32(b []byte) uint32 {
    42		_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
    43		return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
    44	}
    45	
    46	func (binaryLittleEndian) PutUint32(b []byte, v uint32) {
    47		_ = b[3] // early bounds check to guarantee safety of writes below
    48		b[0] = byte(v)
    49		b[1] = byte(v >> 8)
    50		b[2] = byte(v >> 16)
    51		b[3] = byte(v >> 24)
    52	}
    53	
    54	func (binaryLittleEndian) Uint64(b []byte) uint64 {
    55		_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
    56		return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
    57			uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
    58	}
    59	
    60	type binaryBigEndian struct{}
    61	
    62	func (binaryBigEndian) Uint16(b []byte) uint16 {
    63		_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
    64		return uint16(b[1]) | uint16(b[0])<<8
    65	}
    66	
    67	func (binaryBigEndian) PutUint16(b []byte, v uint16) {
    68		_ = b[1] // early bounds check to guarantee safety of writes below
    69		b[0] = byte(v >> 8)
    70		b[1] = byte(v)
    71	}
    72	
    73	func (binaryBigEndian) Uint32(b []byte) uint32 {
    74		_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
    75		return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
    76	}
    77	
    78	func (binaryBigEndian) PutUint32(b []byte, v uint32) {
    79		_ = b[3] // early bounds check to guarantee safety of writes below
    80		b[0] = byte(v >> 24)
    81		b[1] = byte(v >> 16)
    82		b[2] = byte(v >> 8)
    83		b[3] = byte(v)
    84	}
    85	
    86	func (binaryBigEndian) Uint64(b []byte) uint64 {
    87		_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
    88		return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
    89			uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
    90	}
    91	

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