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encoding.go
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/
encoding.go
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// Copyright 2022 gorse Project Authors
//
// 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 encoding
import (
"bytes"
"encoding/binary"
"encoding/gob"
"fmt"
"github.com/chewxy/math32"
"github.com/juju/errors"
"io"
"reflect"
"strconv"
)
// Hex returns the hex form of a 64-bit integer.
func Hex(v int64) string {
return fmt.Sprintf("%x", v)
}
// WriteMatrix writes matrix to byte stream.
func WriteMatrix(w io.Writer, m [][]float32) error {
for i := range m {
err := binary.Write(w, binary.LittleEndian, m[i])
if err != nil {
return errors.Trace(err)
}
}
return nil
}
// ReadMatrix reads matrix from byte stream.
func ReadMatrix(r io.Reader, m [][]float32) error {
for i := range m {
err := binary.Read(r, binary.LittleEndian, m[i])
if err != nil {
return errors.Trace(err)
}
}
return nil
}
// WriteString writes string to byte stream.
func WriteString(w io.Writer, s string) error {
return WriteBytes(w, []byte(s))
}
// ReadString reads string from byte stream.
func ReadString(r io.Reader) (string, error) {
data, err := ReadBytes(r)
return string(data), err
}
// WriteBytes writes bytes to byte stream.
func WriteBytes(w io.Writer, s []byte) error {
err := binary.Write(w, binary.LittleEndian, int32(len(s)))
if err != nil {
return err
}
n, err := w.Write(s)
if err != nil {
return err
} else if n != len(s) {
return errors.New("fail to write string")
}
return nil
}
// ReadBytes reads bytes from byte stream.
func ReadBytes(r io.Reader) ([]byte, error) {
var length int32
err := binary.Read(r, binary.LittleEndian, &length)
if err != nil {
return nil, err
}
data := make([]byte, length)
n, err := r.Read(data)
if err != nil {
return nil, err
} else if n != len(data) {
return nil, errors.New("fail to read string")
}
return data, nil
}
// WriteGob writes object to byte stream.
func WriteGob(w io.Writer, v interface{}) error {
buffer := bytes.NewBuffer(nil)
encoder := gob.NewEncoder(buffer)
err := encoder.Encode(v)
if err != nil {
return err
}
return WriteBytes(w, buffer.Bytes())
}
// ReadGob read object from byte stream.
func ReadGob(r io.Reader, v interface{}) error {
data, err := ReadBytes(r)
if err != nil {
return err
}
buffer := bytes.NewBuffer(data)
decoder := gob.NewDecoder(buffer)
return decoder.Decode(v)
}
func FormatFloat32(val float32) string {
return strconv.FormatFloat(float64(val), 'f', -1, 32)
}
func ParseFloat32(val string) float32 {
f, err := strconv.ParseFloat(val, 32)
if err != nil {
return math32.NaN()
}
return float32(f)
}
func ArrayBytes[T any](val []T) uintptr {
byteCount := reflect.TypeOf(val).Size()
if len(val) > 0 {
byteCount += reflect.TypeOf(val).Elem().Size() * uintptr(len(val))
}
return byteCount
}
func MatrixBytes[T any](val [][]T) uintptr {
byteCount := reflect.TypeOf(val).Size()
if len(val) > 0 {
rowSize := len(val[0])
byteCount += reflect.TypeOf(val).Elem().Size() * uintptr(len(val))
byteCount += reflect.TypeOf(val).Elem().Elem().Size() * uintptr(len(val)*rowSize)
}
return byteCount
}
func StringsBytes(val []string) uintptr {
byteCount := reflect.TypeOf(val).Size()
byteCount += reflect.TypeOf(val).Elem().Size() * uintptr(len(val))
for _, s := range val {
byteCount += 2 * uintptr(len(s))
}
return byteCount
}