tidb encoding_latin1 源码
tidb encoding_latin1 代码
文件路径：/parser/charset/encoding_latin1.go
// Copyright 2021 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package charset
import (
"bytes"
"golang.org/x/text/encoding"
)
// EncodingLatin1Impl is the instance of encodingLatin1.
// TiDB uses utf8 implementation for latin1 charset because of the backward compatibility.
var EncodingLatin1Impl = &encodingLatin1{encodingUTF8{encodingBase{enc: encoding.Nop}}}
func init() {
EncodingLatin1Impl.self = EncodingLatin1Impl
}
// encodingLatin1 compatibles with latin1 in old version TiDB.
type encodingLatin1 struct {
encodingUTF8
}
// Name implements Encoding interface.
func (*encodingLatin1) Name() string {
return CharsetLatin1
}
// Peek implements Encoding interface.
func (*encodingLatin1) Peek(src []byte) []byte {
if len(src) == 0 {
return src
}
return src[:1]
}
// IsValid implements Encoding interface.
func (*encodingLatin1) IsValid(_ []byte) bool {
return true
}
// Tp implements Encoding interface.
func (*encodingLatin1) Tp() EncodingTp {
return EncodingTpLatin1
}
func (*encodingLatin1) Transform(_ *bytes.Buffer, src []byte, _ Op) ([]byte, error) {
return src, nil
}
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