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