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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package binstruct
import (
"encoding"
"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, reflect.Int8, reflect.Uint16, reflect.Int16, reflect.Uint32, reflect.Int32, reflect.Uint64, reflect.Int64:
typ := intKind2Type[val.Kind()]
dat, err := val.Convert(typ).Interface().(Marshaler).MarshalBinary()
if err != nil {
err = &UnmarshalError{
Type: typ,
Method: "MarshalBinary",
Err: err,
}
}
return dat, err
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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