// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This file implements encoding/decoding of Ints.

package big

import (
	
	
)

// Gob codec version. Permits backward-compatible changes to the encoding.
const intGobVersion byte = 1

// GobEncode implements the [encoding/gob.GobEncoder] interface.
func ( *Int) () ([]byte, error) {
	if  == nil {
		return nil, nil
	}
	 := make([]byte, 1+len(.abs)*_S) // extra byte for version and sign bit
	 := .abs.bytes() - 1            // i >= 0
	 := intGobVersion << 1              // make space for sign bit
	if .neg {
		 |= 1
	}
	[] = 
	return [:], nil
}

// GobDecode implements the [encoding/gob.GobDecoder] interface.
func ( *Int) ( []byte) error {
	if len() == 0 {
		// Other side sent a nil or default value.
		* = Int{}
		return nil
	}
	 := [0]
	if >>1 != intGobVersion {
		return fmt.Errorf("Int.GobDecode: encoding version %d not supported", >>1)
	}
	.neg = &1 != 0
	.abs = .abs.setBytes([1:])
	return nil
}

// MarshalText implements the [encoding.TextMarshaler] interface.
func ( *Int) () ( []byte,  error) {
	if  == nil {
		return []byte("<nil>"), nil
	}
	return .abs.itoa(.neg, 10), nil
}

// UnmarshalText implements the [encoding.TextUnmarshaler] interface.
func ( *Int) ( []byte) error {
	if ,  := .setFromScanner(bytes.NewReader(), 0); ! {
		return fmt.Errorf("math/big: cannot unmarshal %q into a *big.Int", )
	}
	return nil
}

// The JSON marshalers are only here for API backward compatibility
// (programs that explicitly look for these two methods). JSON works
// fine with the TextMarshaler only.

// MarshalJSON implements the [encoding/json.Marshaler] interface.
func ( *Int) () ([]byte, error) {
	if  == nil {
		return []byte("null"), nil
	}
	return .abs.itoa(.neg, 10), nil
}

// UnmarshalJSON implements the [encoding/json.Unmarshaler] interface.
func ( *Int) ( []byte) error {
	// Ignore null, like in the main JSON package.
	if string() == "null" {
		return nil
	}
	return .UnmarshalText()
}