// Copyright (C) 2017  Nexedi SA and Contributors.
//                     Kirill Smelkov <kirr@nexedi.com>
//
// This program is free software: you can Use, Study, Modify and Redistribute
// it under the terms of the GNU General Public License version 3, or (at your
// option) any later version, as published by the Free Software Foundation.
//
// You can also Link and Combine this program with other software covered by
// the terms of any of the Free Software licenses or any of the Open Source
// Initiative approved licenses and Convey the resulting work. Corresponding
// source of such a combination shall include the source code for all other
// software used.
//
// This program is distributed WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
// See COPYING file for full licensing terms.
// See https://www.nexedi.com/licensing for rationale and options.

// Utilities related to python pickles
package pickletools

import (
	"math/big"
)

// Xint64 tries to convert unpickled value to int64.
//
// (ogórek decodes python long as big.Int)
func Xint64(xv interface{}) (v int64, ok bool) {
	switch v := xv.(type) {
	case int64:
		return v, true
	case *big.Int:
		if v.IsInt64() {
			return v.Int64(), true
		}
	}

	return 0, false
}
