<?php

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namespace GuzzleHttp\Psr7;

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use 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

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*/

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class BufferStream implements StreamInterface

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{

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private $hwm;

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private $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 exceeds the high

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* water mark, then calls to write will continue to succeed

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* but will return false 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($hwm = 16384)

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{

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$this->hwm = $hwm;

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}

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public function __toString()

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{

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return $this->getContents();

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}

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public function getContents()

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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()

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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()

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{

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return strlen($this->buffer);

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}

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public function isReadable()

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{

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return true;

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}

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public function isWritable()

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{

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return true;

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}

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public function isSeekable()

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{

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return false;

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}

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public function rewind()

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{

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$this->seek(0);

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}

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public function seek($offset, $whence = SEEK_SET)

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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()

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{

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return strlen($this->buffer) === 0;

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}

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public function tell()

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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($length)

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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)

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{

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$this->buffer .= $string;

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// TODO: What should happen here?

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if (strlen($this->buffer) >= $this->hwm) {

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return false;

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}

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return strlen($string);

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}

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public function getMetadata($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 : [];

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}

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}

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