diff options
Diffstat (limited to 'bin/wiki/vendor/guzzlehttp/psr7/src/AppendStream.php')
| -rw-r--r-- | bin/wiki/vendor/guzzlehttp/psr7/src/AppendStream.php | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/bin/wiki/vendor/guzzlehttp/psr7/src/AppendStream.php b/bin/wiki/vendor/guzzlehttp/psr7/src/AppendStream.php new file mode 100644 index 00000000..472a0d61 --- /dev/null +++ b/bin/wiki/vendor/guzzlehttp/psr7/src/AppendStream.php @@ -0,0 +1,241 @@ +<?php +namespace GuzzleHttp\Psr7; + +use Psr\Http\Message\StreamInterface; + +/** + * Reads from multiple streams, one after the other. + * + * This is a read-only stream decorator. + */ +class AppendStream implements StreamInterface +{ + /** @var StreamInterface[] Streams being decorated */ + private $streams = []; + + private $seekable = true; + private $current = 0; + private $pos = 0; + + /** + * @param StreamInterface[] $streams Streams to decorate. Each stream must + * be readable. + */ + public function __construct(array $streams = []) + { + foreach ($streams as $stream) { + $this->addStream($stream); + } + } + + public function __toString() + { + try { + $this->rewind(); + return $this->getContents(); + } catch (\Exception $e) { + return ''; + } + } + + /** + * Add a stream to the AppendStream + * + * @param StreamInterface $stream Stream to append. Must be readable. + * + * @throws \InvalidArgumentException if the stream is not readable + */ + public function addStream(StreamInterface $stream) + { + if (!$stream->isReadable()) { + throw new \InvalidArgumentException('Each stream must be readable'); + } + + // The stream is only seekable if all streams are seekable + if (!$stream->isSeekable()) { + $this->seekable = false; + } + + $this->streams[] = $stream; + } + + public function getContents() + { + return copy_to_string($this); + } + + /** + * Closes each attached stream. + * + * {@inheritdoc} + */ + public function close() + { + $this->pos = $this->current = 0; + $this->seekable = true; + + foreach ($this->streams as $stream) { + $stream->close(); + } + + $this->streams = []; + } + + /** + * Detaches each attached stream. + * + * Returns null as it's not clear which underlying stream resource to return. + * + * {@inheritdoc} + */ + public function detach() + { + $this->pos = $this->current = 0; + $this->seekable = true; + + foreach ($this->streams as $stream) { + $stream->detach(); + } + + $this->streams = []; + } + + public function tell() + { + return $this->pos; + } + + /** + * Tries to calculate the size by adding the size of each stream. + * + * If any of the streams do not return a valid number, then the size of the + * append stream cannot be determined and null is returned. + * + * {@inheritdoc} + */ + public function getSize() + { + $size = 0; + + foreach ($this->streams as $stream) { + $s = $stream->getSize(); + if ($s === null) { + return null; + } + $size += $s; + } + + return $size; + } + + public function eof() + { + return !$this->streams || + ($this->current >= count($this->streams) - 1 && + $this->streams[$this->current]->eof()); + } + + public function rewind() + { + $this->seek(0); + } + + /** + * Attempts to seek to the given position. Only supports SEEK_SET. + * + * {@inheritdoc} + */ + public function seek($offset, $whence = SEEK_SET) + { + if (!$this->seekable) { + throw new \RuntimeException('This AppendStream is not seekable'); + } elseif ($whence !== SEEK_SET) { + throw new \RuntimeException('The AppendStream can only seek with SEEK_SET'); + } + + $this->pos = $this->current = 0; + + // Rewind each stream + foreach ($this->streams as $i => $stream) { + try { + $stream->rewind(); + } catch (\Exception $e) { + throw new \RuntimeException('Unable to seek stream ' + . $i . ' of the AppendStream', 0, $e); + } + } + + // Seek to the actual position by reading from each stream + while ($this->pos < $offset && !$this->eof()) { + $result = $this->read(min(8096, $offset - $this->pos)); + if ($result === '') { + break; + } + } + } + + /** + * Reads from all of the appended streams until the length is met or EOF. + * + * {@inheritdoc} + */ + public function read($length) + { + $buffer = ''; + $total = count($this->streams) - 1; + $remaining = $length; + $progressToNext = false; + + while ($remaining > 0) { + + // Progress to the next stream if needed. + if ($progressToNext || $this->streams[$this->current]->eof()) { + $progressToNext = false; + if ($this->current === $total) { + break; + } + $this->current++; + } + + $result = $this->streams[$this->current]->read($remaining); + + // Using a loose comparison here to match on '', false, and null + if ($result == null) { + $progressToNext = true; + continue; + } + + $buffer .= $result; + $remaining = $length - strlen($buffer); + } + + $this->pos += strlen($buffer); + + return $buffer; + } + + public function isReadable() + { + return true; + } + + public function isWritable() + { + return false; + } + + public function isSeekable() + { + return $this->seekable; + } + + public function write($string) + { + throw new \RuntimeException('Cannot write to an AppendStream'); + } + + public function getMetadata($key = null) + { + return $key ? null : []; + } +} |