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author | Luke Shumaker <lukeshu@lukeshu.com> | 2022-07-13 21:44:18 -0600 |
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committer | Luke Shumaker <lukeshu@lukeshu.com> | 2022-07-13 21:44:18 -0600 |
commit | 296e9fc0f8812ce0c5684ff99f84e80eef07cd4c (patch) | |
tree | f2c0219b5a5db0603af6c55acb6f1684742989fd /lib/btrfs/internal/uuid.go | |
parent | 436e1681c9fcda246c6d84526fc79c87adc7b28d (diff) |
Move files to different packages [ci-skip]
Diffstat (limited to 'lib/btrfs/internal/uuid.go')
-rw-r--r-- | lib/btrfs/internal/uuid.go | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/lib/btrfs/internal/uuid.go b/lib/btrfs/internal/uuid.go new file mode 100644 index 0000000..a16d10f --- /dev/null +++ b/lib/btrfs/internal/uuid.go @@ -0,0 +1,76 @@ +// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com> +// +// SPDX-License-Identifier: GPL-2.0-or-later + +package util + +import ( + "encoding/hex" + "fmt" + "strings" +) + +type UUID [16]byte + +func (uuid UUID) String() string { + str := hex.EncodeToString(uuid[:]) + return strings.Join([]string{ + str[:8], + str[8:12], + str[12:16], + str[16:20], + str[20:32], + }, "-") +} + +func (a UUID) Cmp(b UUID) int { + for i := range a { + if d := int(a[i]) - int(b[i]); d != 0 { + return d + } + } + return 0 +} + +func (uuid UUID) Format(f fmt.State, verb rune) { + FormatByteArrayStringer(uuid, uuid[:], f, verb) +} + +func ParseUUID(str string) (UUID, error) { + var ret UUID + j := 0 + for i := 0; i < len(str); i++ { + if j >= len(ret)*2 { + return UUID{}, fmt.Errorf("too long to be a UUID: %q|%q", str[:i], str[i:]) + } + c := str[i] + var v byte + switch { + case '0' <= c && c <= '9': + v = c - '0' + case 'a' <= c && c <= 'f': + v = c - 'a' + 10 + case 'A' <= c && c <= 'F': + v = c - 'A' + 10 + case c == '-': + continue + default: + return UUID{}, fmt.Errorf("illegal byte in UUID: %q|%q|%q", str[:i], str[i:i+1], str[i+1:]) + } + if j%2 == 0 { + ret[j/2] = v << 4 + } else { + ret[j/2] = (ret[j/2] & 0xf0) | (v & 0x0f) + } + j++ + } + return ret, nil +} + +func MustParseUUID(str string) UUID { + ret, err := ParseUUID(str) + if err != nil { + panic(err) + } + return ret +} |