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Path: /opt/golang/1.22.0/src/encoding/hex/

Viewing File: example_test.go

// Copyright 2016 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 hex_test

import (
	"encoding/hex"
	"fmt"
	"log"
	"os"
)

func ExampleEncode() {
	src := []byte("Hello Gopher!")

	dst := make([]byte, hex.EncodedLen(len(src)))
	hex.Encode(dst, src)

	fmt.Printf("%s\n", dst)

	// Output:
	// 48656c6c6f20476f7068657221
}

func ExampleDecode() {
	src := []byte("48656c6c6f20476f7068657221")

	dst := make([]byte, hex.DecodedLen(len(src)))
	n, err := hex.Decode(dst, src)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("%s\n", dst[:n])

	// Output:
	// Hello Gopher!
}

func ExampleDecodeString() {
	const s = "48656c6c6f20476f7068657221"
	decoded, err := hex.DecodeString(s)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("%s\n", decoded)

	// Output:
	// Hello Gopher!
}

func ExampleDump() {
	content := []byte("Go is an open source programming language.")

	fmt.Printf("%s", hex.Dump(content))

	// Output:
	// 00000000  47 6f 20 69 73 20 61 6e  20 6f 70 65 6e 20 73 6f  |Go is an open so|
	// 00000010  75 72 63 65 20 70 72 6f  67 72 61 6d 6d 69 6e 67  |urce programming|
	// 00000020  20 6c 61 6e 67 75 61 67  65 2e                    | language.|
}

func ExampleDumper() {
	lines := []string{
		"Go is an open source programming language.",
		"\n",
		"We encourage all Go users to subscribe to golang-announce.",
	}

	stdoutDumper := hex.Dumper(os.Stdout)

	defer stdoutDumper.Close()

	for _, line := range lines {
		stdoutDumper.Write([]byte(line))
	}

	// Output:
	// 00000000  47 6f 20 69 73 20 61 6e  20 6f 70 65 6e 20 73 6f  |Go is an open so|
	// 00000010  75 72 63 65 20 70 72 6f  67 72 61 6d 6d 69 6e 67  |urce programming|
	// 00000020  20 6c 61 6e 67 75 61 67  65 2e 0a 57 65 20 65 6e  | language..We en|
	// 00000030  63 6f 75 72 61 67 65 20  61 6c 6c 20 47 6f 20 75  |courage all Go u|
	// 00000040  73 65 72 73 20 74 6f 20  73 75 62 73 63 72 69 62  |sers to subscrib|
	// 00000050  65 20 74 6f 20 67 6f 6c  61 6e 67 2d 61 6e 6e 6f  |e to golang-anno|
	// 00000060  75 6e 63 65 2e                                    |unce.|
}

func ExampleEncodeToString() {
	src := []byte("Hello")
	encodedStr := hex.EncodeToString(src)

	fmt.Printf("%s\n", encodedStr)

	// Output:
	// 48656c6c6f
}
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