Quoted-Printable

复制import quopri

# 编码：bytes → QP 字符串
text = "hello, 世界"
encoded = quopri.encodestring(text.encode("utf-8")).decode("ascii")
print(encoded)  # hello, =E4=B8=96=E7=95=8C

# 解码：QP 字符串 → bytes
decoded = quopri.decodestring(encoded.encode("ascii")).decode("utf-8")
print(decoded)  # hello, 世界

复制package main

import (
	"fmt"
	"mime/quotedprintable"
	"strings"
)

func main() {
	// 编码
	text := "hello, 世界"
	var buf strings.Builder
	w := quotedprintable.NewWriter(&buf)
	w.Write([]byte(text))
	w.Close()
	encoded := buf.String()
	fmt.Println(encoded) // hello, =E4=B8=96=E7=95=8C

	// 解码
	r := quotedprintable.NewReader(strings.NewReader(encoded))
	decoded := make([]byte, len(text))
	n, _ := r.Read(decoded)
	fmt.Println(string(decoded[:n])) // hello, 世界
}

复制// 浏览器环境（无标准库，用 TextEncoder/Decoder 模拟）
// 编码：非 ASCII 字符转为 =XX 格式
function qpEncode(str) {
  return Array.from(new TextEncoder().encode(str))
    .map(b => b > 127 || b === 61 ? '=' + b.toString(16).toUpperCase() : String.fromCharCode(b))
    .join('');
}

// 解码：=XX 转回字节
function qpDecode(str) {
  const bytes = str.replace(/=([0-9A-Fa-f]{2})/g, (_, h) => String.fromCharCode(parseInt(h, 16)));
  return new TextDecoder().decode(new Uint8Array([...bytes].map(c => c.charCodeAt(0))));
}

const text = 'hello, 世界';
const encoded = qpEncode(text);
console.log(encoded); // hello, =E4=B8=96=E7=95=8C

const decoded = qpDecode(encoded);
console.log(decoded); // hello, 世界