forked from FerretDB/FerretDB
/
cstring.go
66 lines (54 loc) · 1.66 KB
/
cstring.go
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// Copyright 2021 FerretDB 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 oldbson
import (
"bufio"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
)
// CString represents BSON zero-terminated UTF-8 string type.
//
// It is not a "real" BSON data type but used by some of them and also by the wire protocol.
type CString string
func (cstr *CString) bsontype() {}
// ReadFrom implements bsontype interface.
func (cstr *CString) ReadFrom(r *bufio.Reader) error {
b, err := r.ReadBytes(0)
if err != nil {
return lazyerrors.Errorf("bson.CString.ReadFrom: %w", err)
}
*cstr = CString(b[:len(b)-1])
return nil
}
// WriteTo implements bsontype interface.
func (cstr CString) WriteTo(w *bufio.Writer) error {
v, err := cstr.MarshalBinary()
if err != nil {
return lazyerrors.Errorf("bson.CString.WriteTo: %w", err)
}
_, err = w.Write(v)
if err != nil {
return lazyerrors.Errorf("bson.CString.WriteTo: %w", err)
}
return nil
}
// MarshalBinary implements bsontype interface.
func (cstr CString) MarshalBinary() ([]byte, error) {
b := make([]byte, len(cstr)+1)
copy(b, cstr)
return b, nil
}
// check interfaces
var (
_ bsontype = (*CString)(nil)
)