(target *os.File, size int64)
| 70 | } |
| 71 | |
| 72 | func fillFile(target *os.File, size int64) (hash string, err error) { |
| 73 | str := make([]byte, 1024) |
| 74 | for i := 0; i < 1023; i++ { |
| 75 | str[i] = fmt.Sprintf("%x", i%16)[0] |
| 76 | } |
| 77 | str[1023] = '\n' |
| 78 | |
| 79 | for i := int64(0); i < size; i += 1024 { |
| 80 | _, err := target.Write(str) |
| 81 | if err != nil { |
| 82 | panic(err) |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | err = target.Truncate(size) |
| 87 | if err != nil { |
| 88 | return "", err |
| 89 | } |
| 90 | |
| 91 | err = target.Sync() |
| 92 | if err != nil { |
| 93 | return "", err |
| 94 | } |
| 95 | |
| 96 | _, err = target.Seek(0, io.SeekStart) |
| 97 | if err != nil { |
| 98 | return "", err |
| 99 | } |
| 100 | |
| 101 | sha := sha256.New() |
| 102 | copySize, err := io.Copy(sha, target) |
| 103 | if err != nil { |
| 104 | return "", err |
| 105 | } |
| 106 | if size != copySize { |
| 107 | return "", errors.New("size mismatch") |
| 108 | } |
| 109 | |
| 110 | return hex.EncodeToString(sha.Sum(nil)), nil |
| 111 | } |
no test coverage detected