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refactor: constants io reusable iface

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This commit is contained in:
Inanc Gumus
2019-11-04 12:09:15 +03:00
parent c41fdc301c
commit acbec476c3
1 changed files with 9 additions and 7 deletions
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16
interfaces/14-io-reusable/main.go
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@ -16,12 +16,15 @@ import (
"os" "os"
) )
func main() { // you can download the rosie.unknown image in the link:
// you can download the rosie.unknown image in the link: // https://inancgumus.github.com/x/rosie.unknown
// https://inancgumus.github.com/x/rosie.unknown
// then feed the file to the standard input of this program: // then feed the file to the standard input of this program:
// go run . < rosie.unknown // go run . < rosie.unknown
func main() {
const pngSign = "\x89PNG\r\n\x1a\n"
const pngSignLen = 8
// create an in-memory buffer (bytes.Buffer is an io.Reader and an io.Writer). // create an in-memory buffer (bytes.Buffer is an io.Reader and an io.Writer).
memory := bytes.Buffer{} memory := bytes.Buffer{}
@ -36,9 +39,8 @@ func main() {
buf := memory.Bytes() buf := memory.Bytes()
// print the first eight bytes. // print the first eight bytes.
fmt.Printf("% x\n", buf[:8]) fmt.Printf("% x\n", buf[:pngSignLen])
// compare it with the png signature. // compare it with the png signature.
const pngSign = "\x89PNG\r\n\x1a\n"
fmt.Printf("% x\n", pngSign) fmt.Printf("% x\n", pngSign)
} }