68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
/*
|
|
Copyright 2022 Alibaba Group Holding Limited.
|
|
|
|
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 rows
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"unsafe"
|
|
|
|
"golang.org/x/exp/constraints"
|
|
|
|
"github.com/alibaba/polardbx-operator/pkg/binlogtool/utils"
|
|
)
|
|
|
|
// MYSQL_TYPE_TINY, MYSQL_TYPE_SHORT, MYSQL_TYPE_LONG, MYSQL_TYPE_LONGLONG
|
|
// MYSQL_TYPE_FLOAT, MYSQL_TYPE_DOUBLE
|
|
|
|
func ExtractNumberFromStream[T constraints.Integer | constraints.Float](r io.Reader) (T, error) {
|
|
bs := make([]byte, unsafe.Sizeof(T(0)))
|
|
if _, err := io.ReadFull(r, bs[:]); err != nil {
|
|
return T(0), fmt.Errorf("unable to read: %w", err)
|
|
}
|
|
return ExtractNumberFromBlock[T](bs[:])
|
|
}
|
|
|
|
func ExtractNumberFromBlock[T constraints.Integer | constraints.Float](bs []byte) (T, error) {
|
|
if unsafe.Sizeof(T(0)) > uintptr(len(bs)) {
|
|
return T(0), errors.New("not enough bytes")
|
|
}
|
|
|
|
var t T
|
|
utils.ReadNumberLittleEndianHack(&t, bs)
|
|
return t, nil
|
|
}
|
|
|
|
// MYSQL_TYPE_INT24
|
|
|
|
func ExtractInt24FromBlock(bs []byte) (uint32, error) {
|
|
if len(bs) < 3 {
|
|
return 0, errors.New("not enough bytes")
|
|
}
|
|
|
|
return (uint32(bs[2]) << 16) + (uint32(bs[1]) << 8) + uint32(bs[0]), nil
|
|
}
|
|
|
|
func ExtractInt24FromStream(r io.Reader) (uint32, error) {
|
|
var bs [3]byte
|
|
if _, err := io.ReadFull(r, bs[:]); err != nil {
|
|
return 0, fmt.Errorf("unable to read: %w", err)
|
|
}
|
|
return ExtractInt24FromBlock(bs[:])
|
|
}
|