GOARCH="amd64"
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"

package main

import (
	"encoding/base32"
	"fmt"
	"io"
	"io/ioutil"
)

func test(chunks []string) {
	fmt.Printf("\n")
	fmt.Printf("%q\n", chunks)

	pr, pw := io.Pipe()

	// Write the encoded chunks into the pipe.
	go func() {
		for _, chunk := range chunks {
			pw.Write([]byte(chunk))
		}
		pw.Close()
	}()

	// Decode base32 from the read end of the pipe.
	decoder := base32.NewDecoder(base32.StdEncoding, pr)
	data, err := ioutil.ReadAll(decoder)
	if err == nil {
		// Restore the EOF that ReadAll elides.
		err = io.EOF
	}
	fmt.Printf("%q %v\n", data, err)
}

func main() {
	// base32.CorruptInputError
	s, err := base32.StdEncoding.DecodeString("NBSWY3DPO5XXE3DEZZ")
	fmt.Printf("DecodeString(%q)\n", "NBSWY3DPO5XXE3DEZZ")
	fmt.Printf("%q %v\n", s, err)

	// io.UnexpectedEOF
	test([]string{"NBSW", "Y3DP", "O5XX", "E3DE", "ZZ"})
	test([]string{"NBSWY3DPO5XXE3DE", "ZZ"})

	// io.EOF
	test([]string{"NBSWY3DPO5XXE3DEZZ"})
	test([]string{"NBS", "WY3", "DPO", "5XX", "E3D", "EZZ"})
	test([]string{"NBSWY3DPO5XXE3", "DEZZ"})
}

DecodeString("NBSWY3DPO5XXE3DEZZ")
"helloworld" illegal base32 data at input byte 16

["NBSW" "Y3DP" "O5XX" "E3DE" "ZZ"]
"helloworld" unexpected EOF

["NBSWY3DPO5XXE3DE" "ZZ"]
"helloworld" unexpected EOF

["NBSWY3DPO5XXE3DEZZ"]
"helloworld" unexpected EOF

["NBS" "WY3" "DPO" "5XX" "E3D" "EZZ"]
"helloworld" unexpected EOF

["NBSWY3DPO5XXE3" "DEZZ"]
"helloworld" unexpected EOF

DecodeString("NBSWY3DPO5XXE3DEZZ")
"helloworld" illegal base32 data at input byte 16

["NBSW" "Y3DP" "O5XX" "E3DE" "ZZ"]
"helloworld" unexpected EOF

["NBSWY3DPO5XXE3DE" "ZZ"]
"helloworld" unexpected EOF

["NBSWY3DPO5XXE3DEZZ"]
"helloworld" EOF

["NBS" "WY3" "DPO" "5XX" "E3D" "EZZ"]
"helloworld" EOF

["NBSWY3DPO5XXE3" "DEZZ"]
"helloworld" EOF