File size: 3,282 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | // Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package binary_test
import (
"bytes"
"encoding/binary"
"fmt"
"math"
)
func ExampleWrite() {
buf := new(bytes.Buffer)
var pi float64 = math.Pi
err := binary.Write(buf, binary.LittleEndian, pi)
if err != nil {
fmt.Println("binary.Write failed:", err)
}
fmt.Printf("% x", buf.Bytes())
// Output: 18 2d 44 54 fb 21 09 40
}
func ExampleWrite_multi() {
buf := new(bytes.Buffer)
var data = []any{
uint16(61374),
int8(-54),
uint8(254),
}
for _, v := range data {
err := binary.Write(buf, binary.LittleEndian, v)
if err != nil {
fmt.Println("binary.Write failed:", err)
}
}
fmt.Printf("%x", buf.Bytes())
// Output: beefcafe
}
func ExampleRead() {
var pi float64
b := []byte{0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40}
buf := bytes.NewReader(b)
err := binary.Read(buf, binary.LittleEndian, &pi)
if err != nil {
fmt.Println("binary.Read failed:", err)
}
fmt.Print(pi)
// Output: 3.141592653589793
}
func ExampleRead_multi() {
b := []byte{0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40, 0xff, 0x01, 0x02, 0x03, 0xbe, 0xef}
r := bytes.NewReader(b)
var data struct {
PI float64
Uate uint8
Mine [3]byte
Too uint16
}
if err := binary.Read(r, binary.LittleEndian, &data); err != nil {
fmt.Println("binary.Read failed:", err)
}
fmt.Println(data.PI)
fmt.Println(data.Uate)
fmt.Printf("% x\n", data.Mine)
fmt.Println(data.Too)
// Output:
// 3.141592653589793
// 255
// 01 02 03
// 61374
}
func ExampleByteOrder_put() {
b := make([]byte, 4)
binary.LittleEndian.PutUint16(b[0:], 0x03e8)
binary.LittleEndian.PutUint16(b[2:], 0x07d0)
fmt.Printf("% x\n", b)
// Output:
// e8 03 d0 07
}
func ExampleByteOrder_get() {
b := []byte{0xe8, 0x03, 0xd0, 0x07}
x1 := binary.LittleEndian.Uint16(b[0:])
x2 := binary.LittleEndian.Uint16(b[2:])
fmt.Printf("%#04x %#04x\n", x1, x2)
// Output:
// 0x03e8 0x07d0
}
func ExamplePutUvarint() {
buf := make([]byte, binary.MaxVarintLen64)
for _, x := range []uint64{1, 2, 127, 128, 255, 256} {
n := binary.PutUvarint(buf, x)
fmt.Printf("%x\n", buf[:n])
}
// Output:
// 01
// 02
// 7f
// 8001
// ff01
// 8002
}
func ExamplePutVarint() {
buf := make([]byte, binary.MaxVarintLen64)
for _, x := range []int64{-65, -64, -2, -1, 0, 1, 2, 63, 64} {
n := binary.PutVarint(buf, x)
fmt.Printf("%x\n", buf[:n])
}
// Output:
// 8101
// 7f
// 03
// 01
// 00
// 02
// 04
// 7e
// 8001
}
func ExampleUvarint() {
inputs := [][]byte{
{0x01},
{0x02},
{0x7f},
{0x80, 0x01},
{0xff, 0x01},
{0x80, 0x02},
}
for _, b := range inputs {
x, n := binary.Uvarint(b)
if n != len(b) {
fmt.Println("Uvarint did not consume all of in")
}
fmt.Println(x)
}
// Output:
// 1
// 2
// 127
// 128
// 255
// 256
}
func ExampleVarint() {
inputs := [][]byte{
{0x81, 0x01},
{0x7f},
{0x03},
{0x01},
{0x00},
{0x02},
{0x04},
{0x7e},
{0x80, 0x01},
}
for _, b := range inputs {
x, n := binary.Varint(b)
if n != len(b) {
fmt.Println("Varint did not consume all of in")
}
fmt.Println(x)
}
// Output:
// -65
// -64
// -2
// -1
// 0
// 1
// 2
// 63
// 64
}
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