mirror of
https://github.com/octoleo/restic.git
synced 2024-12-25 12:09:59 +00:00
2b39f9f4b2
Among others, this updates minio-go, so that the new "eu-west-3" zone for AWS is supported.
240 lines
5.7 KiB
Go
240 lines
5.7 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package width
|
|
|
|
import (
|
|
"unicode/utf8"
|
|
|
|
"golang.org/x/text/transform"
|
|
)
|
|
|
|
type foldTransform struct {
|
|
transform.NopResetter
|
|
}
|
|
|
|
func (foldTransform) Span(src []byte, atEOF bool) (n int, err error) {
|
|
for n < len(src) {
|
|
if src[n] < utf8.RuneSelf {
|
|
// ASCII fast path.
|
|
for n++; n < len(src) && src[n] < utf8.RuneSelf; n++ {
|
|
}
|
|
continue
|
|
}
|
|
v, size := trie.lookup(src[n:])
|
|
if size == 0 { // incomplete UTF-8 encoding
|
|
if !atEOF {
|
|
err = transform.ErrShortSrc
|
|
} else {
|
|
n = len(src)
|
|
}
|
|
break
|
|
}
|
|
if elem(v)&tagNeedsFold != 0 {
|
|
err = transform.ErrEndOfSpan
|
|
break
|
|
}
|
|
n += size
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
func (foldTransform) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
|
|
for nSrc < len(src) {
|
|
if src[nSrc] < utf8.RuneSelf {
|
|
// ASCII fast path.
|
|
start, end := nSrc, len(src)
|
|
if d := len(dst) - nDst; d < end-start {
|
|
end = nSrc + d
|
|
}
|
|
for nSrc++; nSrc < end && src[nSrc] < utf8.RuneSelf; nSrc++ {
|
|
}
|
|
n := copy(dst[nDst:], src[start:nSrc])
|
|
if nDst += n; nDst == len(dst) {
|
|
nSrc = start + n
|
|
if nSrc == len(src) {
|
|
return nDst, nSrc, nil
|
|
}
|
|
if src[nSrc] < utf8.RuneSelf {
|
|
return nDst, nSrc, transform.ErrShortDst
|
|
}
|
|
}
|
|
continue
|
|
}
|
|
v, size := trie.lookup(src[nSrc:])
|
|
if size == 0 { // incomplete UTF-8 encoding
|
|
if !atEOF {
|
|
return nDst, nSrc, transform.ErrShortSrc
|
|
}
|
|
size = 1 // gobble 1 byte
|
|
}
|
|
if elem(v)&tagNeedsFold == 0 {
|
|
if size != copy(dst[nDst:], src[nSrc:nSrc+size]) {
|
|
return nDst, nSrc, transform.ErrShortDst
|
|
}
|
|
nDst += size
|
|
} else {
|
|
data := inverseData[byte(v)]
|
|
if len(dst)-nDst < int(data[0]) {
|
|
return nDst, nSrc, transform.ErrShortDst
|
|
}
|
|
i := 1
|
|
for end := int(data[0]); i < end; i++ {
|
|
dst[nDst] = data[i]
|
|
nDst++
|
|
}
|
|
dst[nDst] = data[i] ^ src[nSrc+size-1]
|
|
nDst++
|
|
}
|
|
nSrc += size
|
|
}
|
|
return nDst, nSrc, nil
|
|
}
|
|
|
|
type narrowTransform struct {
|
|
transform.NopResetter
|
|
}
|
|
|
|
func (narrowTransform) Span(src []byte, atEOF bool) (n int, err error) {
|
|
for n < len(src) {
|
|
if src[n] < utf8.RuneSelf {
|
|
// ASCII fast path.
|
|
for n++; n < len(src) && src[n] < utf8.RuneSelf; n++ {
|
|
}
|
|
continue
|
|
}
|
|
v, size := trie.lookup(src[n:])
|
|
if size == 0 { // incomplete UTF-8 encoding
|
|
if !atEOF {
|
|
err = transform.ErrShortSrc
|
|
} else {
|
|
n = len(src)
|
|
}
|
|
break
|
|
}
|
|
if k := elem(v).kind(); byte(v) == 0 || k != EastAsianFullwidth && k != EastAsianWide && k != EastAsianAmbiguous {
|
|
} else {
|
|
err = transform.ErrEndOfSpan
|
|
break
|
|
}
|
|
n += size
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
func (narrowTransform) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
|
|
for nSrc < len(src) {
|
|
if src[nSrc] < utf8.RuneSelf {
|
|
// ASCII fast path.
|
|
start, end := nSrc, len(src)
|
|
if d := len(dst) - nDst; d < end-start {
|
|
end = nSrc + d
|
|
}
|
|
for nSrc++; nSrc < end && src[nSrc] < utf8.RuneSelf; nSrc++ {
|
|
}
|
|
n := copy(dst[nDst:], src[start:nSrc])
|
|
if nDst += n; nDst == len(dst) {
|
|
nSrc = start + n
|
|
if nSrc == len(src) {
|
|
return nDst, nSrc, nil
|
|
}
|
|
if src[nSrc] < utf8.RuneSelf {
|
|
return nDst, nSrc, transform.ErrShortDst
|
|
}
|
|
}
|
|
continue
|
|
}
|
|
v, size := trie.lookup(src[nSrc:])
|
|
if size == 0 { // incomplete UTF-8 encoding
|
|
if !atEOF {
|
|
return nDst, nSrc, transform.ErrShortSrc
|
|
}
|
|
size = 1 // gobble 1 byte
|
|
}
|
|
if k := elem(v).kind(); byte(v) == 0 || k != EastAsianFullwidth && k != EastAsianWide && k != EastAsianAmbiguous {
|
|
if size != copy(dst[nDst:], src[nSrc:nSrc+size]) {
|
|
return nDst, nSrc, transform.ErrShortDst
|
|
}
|
|
nDst += size
|
|
} else {
|
|
data := inverseData[byte(v)]
|
|
if len(dst)-nDst < int(data[0]) {
|
|
return nDst, nSrc, transform.ErrShortDst
|
|
}
|
|
i := 1
|
|
for end := int(data[0]); i < end; i++ {
|
|
dst[nDst] = data[i]
|
|
nDst++
|
|
}
|
|
dst[nDst] = data[i] ^ src[nSrc+size-1]
|
|
nDst++
|
|
}
|
|
nSrc += size
|
|
}
|
|
return nDst, nSrc, nil
|
|
}
|
|
|
|
type wideTransform struct {
|
|
transform.NopResetter
|
|
}
|
|
|
|
func (wideTransform) Span(src []byte, atEOF bool) (n int, err error) {
|
|
for n < len(src) {
|
|
// TODO: Consider ASCII fast path. Special-casing ASCII handling can
|
|
// reduce the ns/op of BenchmarkWideASCII by about 30%. This is probably
|
|
// not enough to warrant the extra code and complexity.
|
|
v, size := trie.lookup(src[n:])
|
|
if size == 0 { // incomplete UTF-8 encoding
|
|
if !atEOF {
|
|
err = transform.ErrShortSrc
|
|
} else {
|
|
n = len(src)
|
|
}
|
|
break
|
|
}
|
|
if k := elem(v).kind(); byte(v) == 0 || k != EastAsianHalfwidth && k != EastAsianNarrow {
|
|
} else {
|
|
err = transform.ErrEndOfSpan
|
|
break
|
|
}
|
|
n += size
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
func (wideTransform) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
|
|
for nSrc < len(src) {
|
|
// TODO: Consider ASCII fast path. Special-casing ASCII handling can
|
|
// reduce the ns/op of BenchmarkWideASCII by about 30%. This is probably
|
|
// not enough to warrant the extra code and complexity.
|
|
v, size := trie.lookup(src[nSrc:])
|
|
if size == 0 { // incomplete UTF-8 encoding
|
|
if !atEOF {
|
|
return nDst, nSrc, transform.ErrShortSrc
|
|
}
|
|
size = 1 // gobble 1 byte
|
|
}
|
|
if k := elem(v).kind(); byte(v) == 0 || k != EastAsianHalfwidth && k != EastAsianNarrow {
|
|
if size != copy(dst[nDst:], src[nSrc:nSrc+size]) {
|
|
return nDst, nSrc, transform.ErrShortDst
|
|
}
|
|
nDst += size
|
|
} else {
|
|
data := inverseData[byte(v)]
|
|
if len(dst)-nDst < int(data[0]) {
|
|
return nDst, nSrc, transform.ErrShortDst
|
|
}
|
|
i := 1
|
|
for end := int(data[0]); i < end; i++ {
|
|
dst[nDst] = data[i]
|
|
nDst++
|
|
}
|
|
dst[nDst] = data[i] ^ src[nSrc+size-1]
|
|
nDst++
|
|
}
|
|
nSrc += size
|
|
}
|
|
return nDst, nSrc, nil
|
|
}
|