Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

** See the GNU Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

package file

​

import (

    "crypto/sha256"

    "errors"

    "fmt"

    "io"

    "time"

​

    "golang.zabbix.com/sdk/std"

)

​

func sha256sum(file std.File, start time.Time, timeout int) (result interface{}, err error) {

    var bnum int64

    bnum = 16 * 1024

    buf := make([]byte, bnum)

​

    hash := sha256.New()

​

    for bnum > 0 {

        bnum, _ = io.CopyBuffer(hash, file, buf)

        if time.Since(start) > time.Duration(timeout)*time.Second {

            return nil, errors.New("Timeout while processing item.")

        }

    }

​

    return fmt.Sprintf("%x", hash.Sum(nil)), nil

}