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<?php
namespace React\Http\Io;
use Psr\Http\Message\StreamInterface;
/**
* [Internal] PSR-7 message body implementation using an in-memory buffer
*
* @internal
*/
class BufferedBody implements StreamInterface
{
private $buffer = '';
private $position = 0;
private $closed = false;
/**
* @param string $buffer
*/
public function __construct($buffer)
{
$this->buffer = $buffer;
}
public function __toString()
{
if ($this->closed) {
return '';
}
$this->seek(0);
return $this->getContents();
}
public function close()
{
$this->buffer = '';
$this->position = 0;
$this->closed = true;
}
public function detach()
{
$this->close();
return null;
}
public function getSize()
{
return $this->closed ? null : \strlen($this->buffer);
}
public function tell()
{
if ($this->closed) {
throw new \RuntimeException('Unable to tell position of closed stream');
}
return $this->position;
}
public function eof()
{
return $this->position >= \strlen($this->buffer);
}
public function isSeekable()
{
return !$this->closed;
}
public function seek($offset, $whence = \SEEK_SET)
{
if ($this->closed) {
throw new \RuntimeException('Unable to seek on closed stream');
}
$old = $this->position;
if ($whence === \SEEK_SET) {
$this->position = $offset;
} elseif ($whence === \SEEK_CUR) {
$this->position += $offset;
} elseif ($whence === \SEEK_END) {
$this->position = \strlen($this->buffer) + $offset;
} else {
throw new \InvalidArgumentException('Invalid seek mode given');
}
if (!\is_int($this->position) || $this->position < 0) {
$this->position = $old;
throw new \RuntimeException('Unable to seek to position');
}
}
public function rewind()
{
$this->seek(0);
}
public function isWritable()
{
return !$this->closed;
}
public function write($string)
{
if ($this->closed) {
throw new \RuntimeException('Unable to write to closed stream');
}
if ($string === '') {
return 0;
}
if ($this->position > 0 && !isset($this->buffer[$this->position - 1])) {
$this->buffer = \str_pad($this->buffer, $this->position, "\0");
}
$len = \strlen($string);
$this->buffer = \substr($this->buffer, 0, $this->position) . $string . \substr($this->buffer, $this->position + $len);
$this->position += $len;
return $len;
}
public function isReadable()
{
return !$this->closed;
}
public function read($length)
{
if ($this->closed) {
throw new \RuntimeException('Unable to read from closed stream');
}
if ($length < 1) {
throw new \InvalidArgumentException('Invalid read length given');
}
if ($this->position + $length > \strlen($this->buffer)) {
$length = \strlen($this->buffer) - $this->position;
}
if (!isset($this->buffer[$this->position])) {
return '';
}
$pos = $this->position;
$this->position += $length;
return \substr($this->buffer, $pos, $length);
}
public function getContents()
{
if ($this->closed) {
throw new \RuntimeException('Unable to read from closed stream');
}
if (!isset($this->buffer[$this->position])) {
return '';
}
$pos = $this->position;
$this->position = \strlen($this->buffer);
return \substr($this->buffer, $pos);
}
public function getMetadata($key = null)
{
return $key === null ? array() : null;
}
}
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