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<?php |
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|
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declare (strict_types=1); |
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namespace WCPOS\Vendor\GuzzleHttp\Psr7; |
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|
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use WCPOS\Vendor\Psr\Http\Message\StreamInterface; |
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/** |
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* Provides a buffer stream that can be written to to fill a buffer, and read |
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* from to remove bytes from the buffer. |
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* |
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* This stream returns a "hwm" metadata value that tells upstream consumers |
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* what the configured high water mark of the stream is, or the maximum |
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* preferred size of the buffer. |
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*/ |
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final class BufferStream implements StreamInterface |
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{ |
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use NonSerializableStreamTrait; |
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private int $hwm; |
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private string $buffer = ''; |
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/** |
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* @param int $hwm High water mark, representing the preferred maximum |
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* buffer size. If the size of the buffer reaches or exceeds |
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* the high water mark, then calls to write will continue to |
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* succeed but will return 0 to inform writers to slow down |
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* until the buffer has been drained by reading from it. |
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*/ |
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public function __construct(int $hwm = 16384) |
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{ |
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$this->hwm = Integers::assertNonNegativeInteger($hwm, 'High water mark'); |
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} |
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public function __toString() : string |
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{ |
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return $this->getContents(); |
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} |
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public function getContents() : string |
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{ |
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$buffer = $this->buffer; |
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$this->buffer = ''; |
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return $buffer; |
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} |
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public function close() : void |
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{ |
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$this->buffer = ''; |
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} |
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public function detach() |
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{ |
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$this->close(); |
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return null; |
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} |
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public function getSize() : ?int |
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{ |
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return \strlen($this->buffer); |
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} |
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public function isReadable() : bool |
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{ |
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return \true; |
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} |
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public function isWritable() : bool |
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{ |
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return \true; |
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} |
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public function isSeekable() : bool |
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{ |
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return \false; |
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} |
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public function rewind() : void |
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{ |
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$this->seek(0); |
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} |
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public function seek(int $offset, int $whence = \SEEK_SET) : void |
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{ |
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throw new \RuntimeException('Cannot seek a BufferStream'); |
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} |
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public function eof() : bool |
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{ |
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return \strlen($this->buffer) === 0; |
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} |
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public function tell() : int |
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{ |
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throw new \RuntimeException('Cannot determine the position of a BufferStream'); |
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} |
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/** |
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* Reads data from the buffer. |
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*/ |
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public function read(int $length) : string |
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{ |
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if ($length < 0) { |
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throw new \RuntimeException('Length parameter cannot be negative'); |
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} |
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$currentLength = \strlen($this->buffer); |
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if ($length >= $currentLength) { |
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// No need to slice the buffer because we don't have enough data. |
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$result = $this->buffer; |
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$this->buffer = ''; |
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} else { |
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// Slice up the result to provide a subset of the buffer. |
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$result = \substr($this->buffer, 0, $length); |
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$this->buffer = \substr($this->buffer, $length); |
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} |
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return $result; |
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} |
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/** |
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* Writes data to the buffer. |
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*/ |
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public function write(string $string) : int |
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{ |
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$this->buffer .= $string; |
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if (\strlen($this->buffer) >= $this->hwm) { |
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return 0; |
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} |
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return \strlen($string); |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getMetadata(?string $key = null) |
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{ |
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if ($key === 'hwm') { |
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return $this->hwm; |
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} |
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return $key === null ? [] : null; |
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} |
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} |
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