104 lines
1.8 KiB
Go
104 lines
1.8 KiB
Go
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package main
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import (
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"bufio"
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"crypto/md5"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"errors"
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"fmt"
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"hash"
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"io"
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"log"
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"os"
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"strings"
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)
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type checksum struct {
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filename string
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hash hash.Hash
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checksum string
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}
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func parseCS(line string) (checksum, error) {
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elems := strings.Fields(line)
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if len(elems) != 2 {
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return checksum{}, fmt.Errorf("unexpected content: %d != 2", len(elems))
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}
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cs, f := elems[0], elems[1]
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var hsh hash.Hash
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switch len(cs) {
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case 32:
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hsh = md5.New()
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case 40:
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hsh = sha1.New()
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case 64:
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hsh = sha256.New()
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case 128:
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hsh = sha512.New()
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default:
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return checksum{}, fmt.Errorf("unknown format: %q", line)
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}
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return checksum{filename: f, hash: hsh, checksum: cs}, nil
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}
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func check(files []string) error {
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streams := []io.ReadCloser{}
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defer func() {
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for _, stream := range streams {
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stream.Close()
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}
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}()
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for _, name := range files {
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f, err := os.Open(name)
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if err != nil {
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return err
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}
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streams = append(streams, f)
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}
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if len(files) == 0 {
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streams = append(streams, os.Stdin)
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}
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jobs := []checksum{}
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for _, stream := range streams {
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s := bufio.NewScanner(stream)
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for s.Scan() {
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cs, err := parseCS(s.Text())
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if err != nil {
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return err
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}
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jobs = append(jobs, cs)
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}
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if s.Err() != nil {
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return s.Err()
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}
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}
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errs := 0
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for _, job := range jobs {
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f, err := os.Open(job.filename)
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if err != nil {
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return fmt.Errorf("open: %v", err)
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}
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if _, err := io.Copy(job.hash, f); err != nil {
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log.Printf("%+v", err)
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}
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f.Close()
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if fmt.Sprintf("%x", job.hash.Sum(nil)) == job.checksum {
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fmt.Printf("%s: OK\n", job.filename)
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} else {
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errs++
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fmt.Fprintf(os.Stderr, "%s: bad\n", job.filename)
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}
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}
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var err error
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if errs != 0 {
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err = errors.New("bad files found")
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}
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return err
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}
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