[Go语言]我的第八个Go语言程序

破小孩儿

于 2016-08-01 21:04:24 发布

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分类专栏： Go语言文章标签： go语言

本文链接：https://blog.youkuaiyun.com/zjysource/article/details/52089118

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本文介绍如何使用Go语言实现一个ROT13Reader，该Reader实现了io.Reader接口，并从另一个io.Reader读取数据，通过应用ROT13替换密码来修改所有字母字符。ROT13Reader类型已提供，通过实现其Read方法使其成为io.Reader。

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Exercise: rot13Reader

A common pattern is an io.Reader that wraps another io.Reader, modifying the stream in some way.

For example, the gzip.NewReader function takes an io.Reader (a stream of compressed data) and returns a *gzip.Reader that also implements io.Reader (a stream of the decompressed data).

Implement a rot13Reader that implements io.Reader and reads from anio.Reader, modifying the stream by applying the rot13 substitution cipher to all alphabetical characters.

The rot13Reader type is provided for you. Make it an io.Reader by implementing its Read method.

package main

import (
	"io"
	"os"
	"strings"
)

type rot13Reader struct {
	r io.Reader
}

func (rot13 rot13Reader) Read(b []byte) (int, error) {
    n, err := rot13.r.Read(b)
	if err != io.EOF {
	    for i := 0; i < n; i++ {
		    ch := b[i]
			if (ch >= 65 && ch <= 77) || (ch >= 97 && ch <= 109) {
			    b[i] = ch + 13
			} else if (ch >= 78 && ch <= 90) || (ch >= 110 && ch <= 122) {
			    b[i] = ch - 13
			}
		}
	}
	return n, err
}

func main() {
	s := strings.NewReader("Lbh penpxrq gur pbqr!")
	r := rot13Reader{s}
	io.Copy(os.Stdout, &r)
}