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/*
* Copyright 2022 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package utf8
import (
`github.com/bytedance/sonic/internal/rt`
`github.com/bytedance/sonic/internal/native/types`
`github.com/bytedance/sonic/internal/native`
)
// CorrectWith corrects the invalid utf8 byte with repl string.
func CorrectWith(dst []byte, src []byte, repl string) []byte {
sstr := rt.Mem2Str(src)
sidx := 0
/* state machine records the invalid postions */
m := types.NewStateMachine()
m.Sp = 0 // invalid utf8 numbers
for sidx < len(sstr) {
scur := sidx
ecode := native.ValidateUTF8(&sstr, &sidx, m)
if m.Sp != 0 {
if m.Sp > len(sstr) {
panic("numbers of invalid utf8 exceed the string len!")
}
}
for i := 0; i < m.Sp; i++ {
ipos := m.Vt[i] // invalid utf8 position
dst = append(dst, sstr[scur:ipos]...)
dst = append(dst, repl...)
scur = m.Vt[i] + 1
}
/* append the remained valid utf8 bytes */
dst = append(dst, sstr[scur:sidx]...)
/* not enough space, reset and continue */
if ecode != 0 {
m.Sp = 0
}
}
types.FreeStateMachine(m)
return dst
}
// Validate is a simd-accelereated drop-in replacement for the standard library's utf8.Valid.
func Validate(src []byte) bool {
return ValidateString(rt.Mem2Str(src))
}
// ValidateString as Validate, but for string.
func ValidateString(src string) bool {
return native.ValidateUTF8Fast(&src) == 0
}
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