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<?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(); } }