main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import "fmt"
func main() {
fmt.Println(headerOf("gif"))
}
var headers = map[string]string{
"png": "\x89PNG\r\n\x1a\n",
"jpg": "\xff\xd8\xff",
}
func headerOf(format string) (header string) {
defer func() {
if header == "" {
panic("unknown format: " + format)
}
}()
return headers[format]
}
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