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double.go
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double.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"
"bytes"
"encoding/binary"
"math"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
)
// doubleType represents BSON 64-bit binary floating point type.
type doubleType float64
func (d *doubleType) bsontype() {}
// ReadFrom implements bsontype interface.
func (d *doubleType) ReadFrom(r *bufio.Reader) error {
var bits uint64
if err := binary.Read(r, binary.LittleEndian, &bits); err != nil {
return lazyerrors.Errorf("bson.Double.ReadFrom (binary.Read): %w", err)
}
*d = doubleType(math.Float64frombits(bits))
return nil
}
// WriteTo implements bsontype interface.
func (d doubleType) WriteTo(w *bufio.Writer) error {
v, err := d.MarshalBinary()
if err != nil {
return lazyerrors.Errorf("bson.Double.WriteTo: %w", err)
}
_, err = w.Write(v)
if err != nil {
return lazyerrors.Errorf("bson.Double.WriteTo: %w", err)
}
return nil
}
// MarshalBinary implements bsontype interface.
func (d doubleType) MarshalBinary() ([]byte, error) {
var buf bytes.Buffer
binary.Write(&buf, binary.LittleEndian, math.Float64bits(float64(d)))
return buf.Bytes(), nil
}
// check interfaces
var (
_ bsontype = (*doubleType)(nil)
)