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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,206 @@ | ||
| // Copyright (C) 2013-2018 by Maxim Bublis <[email protected]> | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining | ||
| // a copy of this software and associated documentation files (the | ||
| // "Software"), to deal in the Software without restriction, including | ||
| // without limitation the rights to use, copy, modify, merge, publish, | ||
| // distribute, sublicense, and/or sell copies of the Software, and to | ||
| // permit persons to whom the Software is furnished to do so, subject to | ||
| // the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be | ||
| // included in all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
| // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE | ||
| // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION | ||
| // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION | ||
| // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
|
|
||
| package uuid | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/hex" | ||
| "fmt" | ||
| ) | ||
|
|
||
| // FromBytes returns UUID converted from raw byte slice input. | ||
| // It will return error if the slice isn't 16 bytes long. | ||
| func FromBytes(input []byte) (u UUID, err error) { | ||
| err = u.UnmarshalBinary(input) | ||
| return | ||
| } | ||
|
|
||
| // FromBytesOrNil returns UUID converted from raw byte slice input. | ||
| // Same behavior as FromBytes, but returns a Nil UUID on error. | ||
| func FromBytesOrNil(input []byte) UUID { | ||
| uuid, err := FromBytes(input) | ||
| if err != nil { | ||
| return Nil | ||
| } | ||
| return uuid | ||
| } | ||
|
|
||
| // FromString returns UUID parsed from string input. | ||
| // Input is expected in a form accepted by UnmarshalText. | ||
| func FromString(input string) (u UUID, err error) { | ||
| err = u.UnmarshalText([]byte(input)) | ||
| return | ||
| } | ||
|
|
||
| // FromStringOrNil returns UUID parsed from string input. | ||
| // Same behavior as FromString, but returns a Nil UUID on error. | ||
| func FromStringOrNil(input string) UUID { | ||
| uuid, err := FromString(input) | ||
| if err != nil { | ||
| return Nil | ||
| } | ||
| return uuid | ||
| } | ||
|
|
||
| // MarshalText implements the encoding.TextMarshaler interface. | ||
| // The encoding is the same as returned by String. | ||
| func (u UUID) MarshalText() (text []byte, err error) { | ||
| text = []byte(u.String()) | ||
| return | ||
| } | ||
|
|
||
| // UnmarshalText implements the encoding.TextUnmarshaler interface. | ||
| // Following formats are supported: | ||
| // "6ba7b810-9dad-11d1-80b4-00c04fd430c8", | ||
| // "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}", | ||
| // "urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8" | ||
| // "6ba7b8109dad11d180b400c04fd430c8" | ||
| // ABNF for supported UUID text representation follows: | ||
| // uuid := canonical | hashlike | braced | urn | ||
| // plain := canonical | hashlike | ||
| // canonical := 4hexoct '-' 2hexoct '-' 2hexoct '-' 6hexoct | ||
| // hashlike := 12hexoct | ||
| // braced := '{' plain '}' | ||
| // urn := URN ':' UUID-NID ':' plain | ||
| // URN := 'urn' | ||
| // UUID-NID := 'uuid' | ||
| // 12hexoct := 6hexoct 6hexoct | ||
| // 6hexoct := 4hexoct 2hexoct | ||
| // 4hexoct := 2hexoct 2hexoct | ||
| // 2hexoct := hexoct hexoct | ||
| // hexoct := hexdig hexdig | ||
| // hexdig := '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' | | ||
| // 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | | ||
| // 'A' | 'B' | 'C' | 'D' | 'E' | 'F' | ||
| func (u *UUID) UnmarshalText(text []byte) (err error) { | ||
| switch len(text) { | ||
| case 32: | ||
| return u.decodeHashLike(text) | ||
| case 36: | ||
| return u.decodeCanonical(text) | ||
| case 38: | ||
| return u.decodeBraced(text) | ||
| case 41: | ||
| fallthrough | ||
| case 45: | ||
| return u.decodeURN(text) | ||
| default: | ||
| return fmt.Errorf("uuid: incorrect UUID length: %s", text) | ||
| } | ||
| } | ||
|
|
||
| // decodeCanonical decodes UUID string in format | ||
| // "6ba7b810-9dad-11d1-80b4-00c04fd430c8". | ||
| func (u *UUID) decodeCanonical(t []byte) (err error) { | ||
| if t[8] != '-' || t[13] != '-' || t[18] != '-' || t[23] != '-' { | ||
| return fmt.Errorf("uuid: incorrect UUID format %s", t) | ||
| } | ||
|
|
||
| src := t[:] | ||
| dst := u[:] | ||
|
|
||
| for i, byteGroup := range byteGroups { | ||
| if i > 0 { | ||
| src = src[1:] // skip dash | ||
| } | ||
| _, err = hex.Decode(dst[:byteGroup/2], src[:byteGroup]) | ||
| if err != nil { | ||
| return | ||
| } | ||
| src = src[byteGroup:] | ||
| dst = dst[byteGroup/2:] | ||
| } | ||
|
|
||
| return | ||
| } | ||
|
|
||
| // decodeHashLike decodes UUID string in format | ||
| // "6ba7b8109dad11d180b400c04fd430c8". | ||
| func (u *UUID) decodeHashLike(t []byte) (err error) { | ||
| src := t[:] | ||
| dst := u[:] | ||
|
|
||
| if _, err = hex.Decode(dst, src); err != nil { | ||
| return err | ||
| } | ||
| return | ||
| } | ||
|
|
||
| // decodeBraced decodes UUID string in format | ||
| // "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}" or in format | ||
| // "{6ba7b8109dad11d180b400c04fd430c8}". | ||
| func (u *UUID) decodeBraced(t []byte) (err error) { | ||
| l := len(t) | ||
|
|
||
| if t[0] != '{' || t[l-1] != '}' { | ||
| return fmt.Errorf("uuid: incorrect UUID format %s", t) | ||
| } | ||
|
|
||
| return u.decodePlain(t[1 : l-1]) | ||
| } | ||
|
|
||
| // decodeURN decodes UUID string in format | ||
| // "urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8" or in format | ||
| // "urn:uuid:6ba7b8109dad11d180b400c04fd430c8". | ||
| func (u *UUID) decodeURN(t []byte) (err error) { | ||
| total := len(t) | ||
|
|
||
| urn_uuid_prefix := t[:9] | ||
|
|
||
| if !bytes.Equal(urn_uuid_prefix, urnPrefix) { | ||
| return fmt.Errorf("uuid: incorrect UUID format: %s", t) | ||
| } | ||
|
|
||
| return u.decodePlain(t[9:total]) | ||
| } | ||
|
|
||
| // decodePlain decodes UUID string in canonical format | ||
| // "6ba7b810-9dad-11d1-80b4-00c04fd430c8" or in hash-like format | ||
| // "6ba7b8109dad11d180b400c04fd430c8". | ||
| func (u *UUID) decodePlain(t []byte) (err error) { | ||
| switch len(t) { | ||
| case 32: | ||
| return u.decodeHashLike(t) | ||
| case 36: | ||
| return u.decodeCanonical(t) | ||
| default: | ||
| return fmt.Errorf("uuid: incorrrect UUID length: %s", t) | ||
| } | ||
| } | ||
|
|
||
| // MarshalBinary implements the encoding.BinaryMarshaler interface. | ||
| func (u UUID) MarshalBinary() (data []byte, err error) { | ||
| data = u.Bytes() | ||
| return | ||
| } | ||
|
|
||
| // UnmarshalBinary implements the encoding.BinaryUnmarshaler interface. | ||
| // It will return error if the slice isn't 16 bytes long. | ||
| func (u *UUID) UnmarshalBinary(data []byte) (err error) { | ||
| if len(data) != Size { | ||
| err = fmt.Errorf("uuid: UUID must be exactly 16 bytes long, got %d bytes", len(data)) | ||
| return | ||
| } | ||
| copy(u[:], data) | ||
|
|
||
| return | ||
| } |
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