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utf16.go
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utf16.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 windows
import (
"fmt"
"unicode/utf16"
)
// UTF16BytesToString returns a string that is decoded from the UTF-16 bytes.
// The byte slice must be of even length otherwise an error will be returned.
// The integer returned is the offset to the start of the next string with
// buffer if it exists, otherwise -1 is returned.
func UTF16BytesToString(b []byte) (string, int, error) {
if len(b)%2 != 0 {
return "", 0, fmt.Errorf("slice must have an even length (length=%d)", len(b))
}
offset := -1
// Find the null terminator if it exists and re-slice the b.
if nullIndex := indexNullTerminator(b); nullIndex > -1 {
if len(b) > nullIndex+2 {
offset = nullIndex + 2
}
b = b[:nullIndex]
}
s := make([]uint16, len(b)/2)
for i := range s {
s[i] = uint16(b[i*2]) + uint16(b[(i*2)+1])<<8
}
return string(utf16.Decode(s)), offset, nil
}
// indexNullTerminator returns the index of a null terminator within a buffer
// containing UTF-16 encoded data. If the null terminator is not found -1 is
// returned.
func indexNullTerminator(b []byte) int {
if len(b) < 2 {
return -1
}
for i := 0; i < len(b); i += 2 {
if b[i] == 0 && b[i+1] == 0 {
return i
}
}
return -1
}