package zkp

import (
	"fmt"
	"math/big"
)

type big_Int big.Int

func (b big_Int) MarshalJSON() ([]byte, error) {
	i := big.Int(b)
	v := fmt.Sprintf("\"%x\"", i.Bytes())
	return []byte(v), nil
}

func (b *big_Int) UnmarshalJSON(p []byte) error {
	if string(p) == "null" {
		return nil
	}
	var v = []byte{}
	if _, err := fmt.Sscanf(string(p), "\"%x\"", &v); err != nil {
		return fmt.Errorf("not a valid big integer: %s", p)
	}
	*b = big_Int(*new(big.Int).SetBytes(v))
	return nil
}