github.com/alibaba/ilogtail/pkg@v0.0.0-20250526110833-c53b480d046c/util/string_helper.go (about)

     1  // Copyright 2022 iLogtail Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package util
    16  
    17  import (
    18  	"reflect"
    19  	"unsafe"
    20  )
    21  
    22  //nolint:gosec
    23  func ZeroCopyBytesToString(b []byte) (s string) {
    24  	if b == nil {
    25  		return
    26  	}
    27  	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
    28  	pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
    29  	pstring.Data = pbytes.Data
    30  	pstring.Len = pbytes.Len
    31  	return
    32  }
    33  
    34  //nolint:gosec
    35  func ZeroCopyStringToBytes(s string) (b []byte) {
    36  	if s == "" {
    37  		return
    38  	}
    39  	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
    40  	pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
    41  	pbytes.Data = pstring.Data
    42  	pbytes.Len = pstring.Len
    43  	pbytes.Cap = pstring.Len
    44  	return
    45  }
    46  
    47  func IsSafeString(str1, str2 string) bool {
    48  	slice1 := ZeroCopyStringToBytes(str1)
    49  	slice2 := ZeroCopyStringToBytes(str2)
    50  	isIn := func(bytes1, bytes2 []byte) bool {
    51  		for i := range bytes2 {
    52  			if &bytes2[i] == &bytes1[0] || &bytes2[i] == &bytes1[len(bytes1)-1] {
    53  				return true
    54  			}
    55  		}
    56  		return false
    57  	}
    58  	return !isIn(slice1, slice2) && !isIn(slice2, slice1)
    59  }