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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package binstruct
import (
"encoding"
"encoding/binary"
"fmt"
"reflect"
)
type Marshaler = encoding.BinaryMarshaler
func Marshal(obj any) ([]byte, error) {
if mar, ok := obj.(Marshaler); ok {
dat, err := mar.MarshalBinary()
if err != nil {
err = &UnmarshalError{
Type: reflect.TypeOf(obj),
Method: "MarshalBinary",
Err: err,
}
}
return dat, err
}
return MarshalWithoutInterface(obj)
}
func MarshalWithoutInterface(obj any) ([]byte, error) {
val := reflect.ValueOf(obj)
switch val.Kind() {
case reflect.Uint8:
var buf [sizeof8]byte
buf[0] = byte(val.Uint())
return buf[:], nil
case reflect.Int8:
var buf [sizeof8]byte
buf[0] = byte(val.Int())
return buf[:], nil
case reflect.Uint16:
var buf [sizeof16]byte
binary.LittleEndian.PutUint16(buf[:], uint16(val.Uint()))
return buf[:], nil
case reflect.Int16:
var buf [sizeof16]byte
binary.LittleEndian.PutUint16(buf[:], uint16(val.Int()))
return buf[:], nil
case reflect.Uint32:
var buf [sizeof32]byte
binary.LittleEndian.PutUint32(buf[:], uint32(val.Uint()))
return buf[:], nil
case reflect.Int32:
var buf [sizeof32]byte
binary.LittleEndian.PutUint32(buf[:], uint32(val.Int()))
return buf[:], nil
case reflect.Uint64:
var buf [sizeof64]byte
binary.LittleEndian.PutUint64(buf[:], val.Uint())
return buf[:], nil
case reflect.Int64:
var buf [sizeof64]byte
binary.LittleEndian.PutUint64(buf[:], uint64(val.Int()))
return buf[:], nil
case reflect.Ptr:
return Marshal(val.Elem().Interface())
case reflect.Array:
var ret []byte
for i := 0; i < val.Len(); i++ {
bs, err := Marshal(val.Index(i).Interface())
ret = append(ret, bs...)
if err != nil {
return ret, err
}
}
return ret, nil
case reflect.Struct:
return getStructHandler(val.Type()).Marshal(val)
default:
panic(&InvalidTypeError{
Type: val.Type(),
Err: fmt.Errorf("does not implement binfmt.Marshaler and kind=%v is not a supported statically-sized kind",
val.Kind()),
})
}
}
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