<?php

declare(strict_types=1);

namespace ZipStream;

use OverflowException;

class Bigint
{
    /**
     * @var int[]
     */
    private $bytes = [0, 0, 0, 0, 0, 0, 0, 0];

    /**
     * Initialize the bytes array
     *
     * @param int $value
     */
    public function __construct(int $value = 0)
    {
        $this->fillBytes($value, 0, 8);
    }

    /**
     * Get an instance
     *
     * @param int $value
     * @return Bigint
     */
    public static function init(int $value = 0): self
    {
        return new self($value);
    }

    /**
     * Fill bytes from low to high
     *
     * @param int $low
     * @param int $high
     * @return Bigint
     */
    public static function fromLowHigh(int $low, int $high): self
    {
        $bigint = new self();
        $bigint->fillBytes($low, 0, 4);
        $bigint->fillBytes($high, 4, 4);
        return $bigint;
    }

    /**
     * Get high 32
     *
     * @return int
     */
    public function getHigh32(): int
    {
        return $this->getValue(4, 4);
    }

    /**
     * Get value from bytes array
     *
     * @param int $end
     * @param int $length
     * @return int
     */
    public function getValue(int $end = 0, int $length = 8): int
    {
        $result = 0;
        for ($i = $end + $length - 1; $i >= $end; $i--) {
            $result <<= 8;
            $result |= $this->bytes[$i];
        }
        return $result;
    }

    /**
     * Get low FF
     *
     * @param bool $force
     * @return float
     */
    public function getLowFF(bool $force = false): float
    {
        if ($force || $this->isOver32()) {
            return (float)0xFFFFFFFF;
        }
        return (float)$this->getLow32();
    }

    /**
     * Check if is over 32
     *
     * @psalm-suppress ArgumentTypeCoercion
     * @param bool $force
     * @return bool
     */
    public function isOver32(bool $force = false): bool
    {
        // value 0xFFFFFFFF already needs a Zip64 header
        return $force ||
            max(array_slice($this->bytes, 4, 4)) > 0 ||
            min(array_slice($this->bytes, 0, 4)) === 0xFF;
    }

    /**
     * Get low 32
     *
     * @return int
     */
    public function getLow32(): int
    {
        return $this->getValue(0, 4);
    }

    /**
     * Get hexadecimal
     *
     * @return string
     */
    public function getHex64(): string
    {
        $result = '0x';
        for ($i = 7; $i >= 0; $i--) {
            $result .= sprintf('%02X', $this->bytes[$i]);
        }
        return $result;
    }

    /**
     * Add
     *
     * @param Bigint $other
     * @return Bigint
     */
    public function add(self $other): self
    {
        $result = clone $this;
        $overflow = false;
        for ($i = 0; $i < 8; $i++) {
            $result->bytes[$i] += $other->bytes[$i];
            if ($overflow) {
                $result->bytes[$i]++;
                $overflow = false;
            }
            if ($result->bytes[$i] & 0x100) {
                $overflow = true;
                $result->bytes[$i] &= 0xFF;
            }
        }
        if ($overflow) {
            throw new OverflowException();
        }
        return $result;
    }

    /**
     * Fill the bytes field with int
     *
     * @param int $value
     * @param int $start
     * @param int $count
     * @return void
     */
    protected function fillBytes(int $value, int $start, int $count): void
    {
        for ($i = 0; $i < $count; $i++) {
            $this->bytes[$start + $i] = $i >= PHP_INT_SIZE ? 0 : $value & 0xFF;
            $value >>= 8;
        }
    }
}

• [D] Exception
• [D] Option
• [F] Bigint.php
  Delete
• [F] DeflateStream.php
  Delete
• [F] Exception.php
  Delete
• [F] File.php
  Delete
• [F] Stream.php
  Delete
• [F] ZipStream.php
  Delete

Contact Section

Get in Touch with Us for Any Questions or Support

We’d love to hear from you! Whether you have questions, feedback, or need support, our team is here to help. Reach out to us via email, phone, or visit our office. We’re committed to providing you with exceptional service and ensuring your experience with NFC Pay is seamless and satisfying. Let’s connect!

Name*

Email*

Message*

Send Message

Our Location

20-22 Wenlock Road, England, N1 7GU

Call us on: +03601 885399

Our office hours Monday–Friday, 9am - 9pm

Email us directly

support@example.com