mirror of https://github.com/tidwall/tile38.git
51 lines
869 B
Go
51 lines
869 B
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
|
|
"github.com/cespare/xxhash/v2"
|
|
)
|
|
|
|
func main() {
|
|
if contains(os.Args[1:], "-h") {
|
|
fmt.Fprintf(os.Stderr, `Usage:
|
|
%s [filenames]
|
|
If no filenames are provided or only - is given, input is read from stdin.
|
|
`, os.Args[0])
|
|
os.Exit(1)
|
|
}
|
|
if len(os.Args) < 2 || len(os.Args) == 2 && os.Args[1] == "-" {
|
|
printHash(os.Stdin, "-")
|
|
return
|
|
}
|
|
for _, path := range os.Args[1:] {
|
|
f, err := os.Open(path)
|
|
if err != nil {
|
|
fmt.Fprintln(os.Stderr, err)
|
|
continue
|
|
}
|
|
printHash(f, path)
|
|
f.Close()
|
|
}
|
|
}
|
|
|
|
func contains(ss []string, s string) bool {
|
|
for _, s1 := range ss {
|
|
if s1 == s {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func printHash(r io.Reader, name string) {
|
|
h := xxhash.New()
|
|
if _, err := io.Copy(h, r); err != nil {
|
|
fmt.Fprintln(os.Stderr, err)
|
|
return
|
|
}
|
|
fmt.Printf("%016x %s\n", h.Sum64(), name)
|
|
}
|