<?php

declare(strict_types=1);

namespace ZipStream;

use function mb_strlen;

use Psr\Http\Message\StreamInterface;
use RuntimeException;

/**
 * Describes a data stream.
 *
 * Typically, an instance will wrap a PHP stream; this interface provides
 * a wrapper around the most common operations, including serialization of
 * the entire stream to a string.
 */
class Stream implements StreamInterface
{
    protected $stream;

    public function __construct($stream)
    {
        $this->stream = $stream;
    }

    /**
     * Reads all data from the stream into a string, from the beginning to end.
     *
     * This method MUST attempt to seek to the beginning of the stream before
     * reading data and read the stream until the end is reached.
     *
     * Warning: This could attempt to load a large amount of data into memory.
     *
     * This method MUST NOT raise an exception in order to conform with PHP's
     * string casting operations.
     *
     * @see http://php.net/manual/en/language.oop5.magic.php#object.tostring
     * @return string
     */
    public function __toString(): string
    {
        try {
            $this->seek(0);
        } catch (RuntimeException $e) {
        }
        return (string) stream_get_contents($this->stream);
    }

    /**
     * Closes the stream and any underlying resources.
     *
     * @return void
     */
    public function close(): void
    {
        if (is_resource($this->stream)) {
            fclose($this->stream);
        }
        $this->detach();
    }

    /**
     * Separates any underlying resources from the stream.
     *
     * After the stream has been detached, the stream is in an unusable state.
     *
     * @return resource|null Underlying PHP stream, if any
     */
    public function detach()
    {
        $result = $this->stream;
        $this->stream = null;
        return $result;
    }

    /**
     * Seek to a position in the stream.
     *
     * @link http://www.php.net/manual/en/function.fseek.php
     * @param int $offset Stream offset
     * @param int $whence Specifies how the cursor position will be calculated
     *     based on the seek offset. Valid values are identical to the built-in
     *     PHP $whence values for `fseek()`.  SEEK_SET: Set position equal to
     *     offset bytes SEEK_CUR: Set position to current location plus offset
     *     SEEK_END: Set position to end-of-stream plus offset.
     * @throws RuntimeException on failure.
     */
    public function seek($offset, $whence = SEEK_SET): void
    {
        if (!$this->isSeekable()) {
            throw new RuntimeException();
        }
        if (fseek($this->stream, $offset, $whence) !== 0) {
            throw new RuntimeException();
        }
    }

    /**
     * Returns whether or not the stream is seekable.
     *
     * @return bool
     */
    public function isSeekable(): bool
    {
        return (bool)$this->getMetadata('seekable');
    }

    /**
     * Get stream metadata as an associative array or retrieve a specific key.
     *
     * The keys returned are identical to the keys returned from PHP's
     * stream_get_meta_data() function.
     *
     * @link http://php.net/manual/en/function.stream-get-meta-data.php
     * @param string $key Specific metadata to retrieve.
     * @return array|mixed|null Returns an associative array if no key is
     *     provided. Returns a specific key value if a key is provided and the
     *     value is found, or null if the key is not found.
     */
    public function getMetadata($key = null)
    {
        $metadata = stream_get_meta_data($this->stream);
        return $key !== null ? @$metadata[$key] : $metadata;
    }

    /**
     * Get the size of the stream if known.
     *
     * @return int|null Returns the size in bytes if known, or null if unknown.
     */
    public function getSize(): ?int
    {
        $stats = fstat($this->stream);
        return $stats['size'];
    }

    /**
     * Returns the current position of the file read/write pointer
     *
     * @return int Position of the file pointer
     * @throws RuntimeException on error.
     */
    public function tell(): int
    {
        $position = ftell($this->stream);
        if ($position === false) {
            throw new RuntimeException();
        }
        return $position;
    }

    /**
     * Returns true if the stream is at the end of the stream.
     *
     * @return bool
     */
    public function eof(): bool
    {
        return feof($this->stream);
    }

    /**
     * Seek to the beginning of the stream.
     *
     * If the stream is not seekable, this method will raise an exception;
     * otherwise, it will perform a seek(0).
     *
     * @see seek()
     * @link http://www.php.net/manual/en/function.fseek.php
     * @throws RuntimeException on failure.
     */
    public function rewind(): void
    {
        $this->seek(0);
    }

    /**
     * Write data to the stream.
     *
     * @param string $string The string that is to be written.
     * @return int Returns the number of bytes written to the stream.
     * @throws RuntimeException on failure.
     */
    public function write($string): int
    {
        if (!$this->isWritable()) {
            throw new RuntimeException();
        }
        if (fwrite($this->stream, $string) === false) {
            throw new RuntimeException();
        }
        return mb_strlen($string);
    }

    /**
     * Returns whether or not the stream is writable.
     *
     * @return bool
     */
    public function isWritable(): bool
    {
        $mode = $this->getMetadata('mode');
        if (!is_string($mode)) {
            throw new RuntimeException('Could not get stream mode from metadata!');
        }
        return preg_match('/[waxc+]/', $mode) === 1;
    }

    /**
     * Read data from the stream.
     *
     * @param int $length Read up to $length bytes from the object and return
     *     them. Fewer than $length bytes may be returned if underlying stream
     *     call returns fewer bytes.
     * @return string Returns the data read from the stream, or an empty string
     *     if no bytes are available.
     * @throws RuntimeException if an error occurs.
     */
    public function read($length): string
    {
        if (!$this->isReadable()) {
            throw new RuntimeException();
        }
        $result = fread($this->stream, $length);
        if ($result === false) {
            throw new RuntimeException();
        }
        return $result;
    }

    /**
     * Returns whether or not the stream is readable.
     *
     * @return bool
     */
    public function isReadable(): bool
    {
        $mode = $this->getMetadata('mode');
        if (!is_string($mode)) {
            throw new RuntimeException('Could not get stream mode from metadata!');
        }
        return preg_match('/[r+]/', $mode) === 1;
    }

    /**
     * Returns the remaining contents in a string
     *
     * @return string
     * @throws RuntimeException if unable to read or an error occurs while
     *     reading.
     */
    public function getContents(): string
    {
        if (!$this->isReadable()) {
            throw new RuntimeException();
        }
        $result = stream_get_contents($this->stream);
        if ($result === false) {
            throw new RuntimeException();
        }
        return $result;
    }
}

• [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

About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

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FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

How do I register for NFC Pay?

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Is my payment information secure?

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Can I add multiple cards to my NFC Pay wallet?

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How do I transfer money to another user?

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How can I activate my merchant account?

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