<?php
declare(strict_types=1);
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Stream decorator that can cache previously read bytes from a sequentially
* read stream.
*/
final class CachingStream implements StreamInterface
{
use StreamDecoratorTrait;
/** @var StreamInterface Stream being wrapped */
private $remoteStream;
/** @var int Number of bytes to skip reading due to a write on the buffer */
private $skipReadBytes = 0;
/**
* @var StreamInterface
*/
private $stream;
/**
* We will treat the buffer object as the body of the stream
*
* @param StreamInterface $stream Stream to cache. The cursor is assumed to be at the beginning of the stream.
* @param StreamInterface $target Optionally specify where data is cached
*/
public function __construct(
StreamInterface $stream,
StreamInterface $target = null
) {
$this->remoteStream = $stream;
$this->stream = $target ?: new Stream(Utils::tryFopen('php://temp', 'r+'));
}
public function getSize(): ?int
{
$remoteSize = $this->remoteStream->getSize();
if (null === $remoteSize) {
return null;
}
return max($this->stream->getSize(), $remoteSize);
}
public function rewind(): void
{
$this->seek(0);
}
public function seek($offset, $whence = SEEK_SET): void
{
if ($whence === SEEK_SET) {
$byte = $offset;
} elseif ($whence === SEEK_CUR) {
$byte = $offset + $this->tell();
} elseif ($whence === SEEK_END) {
$size = $this->remoteStream->getSize();
if ($size === null) {
$size = $this->cacheEntireStream();
}
$byte = $size + $offset;
} else {
throw new \InvalidArgumentException('Invalid whence');
}
$diff = $byte - $this->stream->getSize();
if ($diff > 0) {
// Read the remoteStream until we have read in at least the amount
// of bytes requested, or we reach the end of the file.
while ($diff > 0 && !$this->remoteStream->eof()) {
$this->read($diff);
$diff = $byte - $this->stream->getSize();
}
} else {
// We can just do a normal seek since we've already seen this byte.
$this->stream->seek($byte);
}
}
public function read($length): string
{
// Perform a regular read on any previously read data from the buffer
$data = $this->stream->read($length);
$remaining = $length - strlen($data);
// More data was requested so read from the remote stream
if ($remaining) {
// If data was written to the buffer in a position that would have
// been filled from the remote stream, then we must skip bytes on
// the remote stream to emulate overwriting bytes from that
// position. This mimics the behavior of other PHP stream wrappers.
$remoteData = $this->remoteStream->read(
$remaining + $this->skipReadBytes
);
if ($this->skipReadBytes) {
$len = strlen($remoteData);
$remoteData = substr($remoteData, $this->skipReadBytes);
$this->skipReadBytes = max(0, $this->skipReadBytes - $len);
}
$data .= $remoteData;
$this->stream->write($remoteData);
}
return $data;
}
public function write($string): int
{
// When appending to the end of the currently read stream, you'll want
// to skip bytes from being read from the remote stream to emulate
// other stream wrappers. Basically replacing bytes of data of a fixed
// length.
$overflow = (strlen($string) + $this->tell()) - $this->remoteStream->tell();
if ($overflow > 0) {
$this->skipReadBytes += $overflow;
}
return $this->stream->write($string);
}
public function eof(): bool
{
return $this->stream->eof() && $this->remoteStream->eof();
}
/**
* Close both the remote stream and buffer stream
*/
public function close(): void
{
$this->remoteStream->close();
$this->stream->close();
}
private function cacheEntireStream(): int
{
$target = new FnStream(['write' => 'strlen']);
Utils::copyToStream($this, $target);
return $this->tell();
}
}
At NFC Pay, we strive to provide a seamless and satisfactory experience with our services. This Refund Policy outlines the circumstances under which refunds may be issued for transactions made through our platform. Please read this policy carefully to understand your rights regarding refunds.
1. Eligibility for Refunds
Refunds may be considered under the following circumstances:
2. Non-Refundable Situations
Refunds will generally not be issued in the following situations:
3. Refund Process
To request a refund, please follow these steps:
4. Refund Exceptions
Certain transactions may be subject to specific terms and conditions, including non-refundable fees or charges. Please review the terms associated with each transaction carefully, as some fees may not be eligible for refunds.
5. Modifications to the Refund Policy
NFC Pay reserves the right to modify this Refund Policy at any time. Changes will be communicated through updates on our website and app, and the effective date will be updated accordingly. We encourage you to review this policy periodically to stay informed about our refund practices.
By using NFC Pay, you agree to this Refund Policy and understand the terms under which refunds may be issued. Our goal is to ensure a fair and transparent refund process, providing you with confidence and peace of mind when using our services.