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<?php
namespace Mpdf\Http;
/**
* @link nyholm/psr7
*/
class Stream implements \Psr\Http\Message\StreamInterface
{
/**
* A resource reference.
*
* @var resource
*/
private $stream;
/**
* @var bool
*/
private $seekable;
/**
* @var bool
*/
private $readable;
/**
* @var bool
*/
private $writable;
/**
* @var array|mixed|null|void
*/
private $uri;
/**
* @var int
*/
private $size;
/** @var array Hash of readable and writable stream types */
private static $readWriteHash = [
'read' => [
'r' => true, 'w+' => true, 'r+' => true, 'x+' => true, 'c+' => true,
'rb' => true, 'w+b' => true, 'r+b' => true, 'x+b' => true,
'c+b' => true, 'rt' => true, 'w+t' => true, 'r+t' => true,
'x+t' => true, 'c+t' => true, 'a+' => true,
],
'write' => [
'w' => true, 'w+' => true, 'rw' => true, 'r+' => true, 'x+' => true,
'c+' => true, 'wb' => true, 'w+b' => true, 'r+b' => true,
'x+b' => true, 'c+b' => true, 'w+t' => true, 'r+t' => true,
'x+t' => true, 'c+t' => true, 'a' => true, 'a+' => true,
],
];
private function __construct()
{
}
/**
* @param resource $resource
*
* @return Stream
*/
public static function createFromResource($resource)
{
if (!is_resource($resource)) {
throw new \InvalidArgumentException('Stream must be a resource');
}
$obj = new self();
$obj->stream = $resource;
$meta = stream_get_meta_data($obj->stream);
$obj->seekable = $meta['seekable'];
$obj->readable = isset(self::$readWriteHash['read'][$meta['mode']]);
$obj->writable = isset(self::$readWriteHash['write'][$meta['mode']]);
$obj->uri = $obj->getMetadata('uri');
return $obj;
}
/**
* @param string $content
*
* @return Stream
*/
public static function create($content)
{
$resource = fopen('php://temp', 'rwb+');
$stream = self::createFromResource($resource);
$stream->write($content);
$stream->seek(0);
return $stream;
}
/**
* Closes the stream when the destructed.
*/
public function __destruct()
{
$this->close();
}
public function __toString()
{
try {
if ($this->isSeekable()) {
$this->seek(0);
}
return $this->getContents();
} catch (\Exception $e) {
return '';
}
}
public function close()
{
if (isset($this->stream)) {
if (is_resource($this->stream)) {
fclose($this->stream);
}
$this->detach();
}
}
public function detach()
{
if (!isset($this->stream)) {
return;
}
$result = $this->stream;
unset($this->stream);
$this->size = $this->uri = null;
$this->readable = $this->writable = $this->seekable = false;
return $result;
}
public function getSize()
{
if ($this->size !== null) {
return $this->size;
}
if (!isset($this->stream)) {
return;
}
// Clear the stat cache if the stream has a URI
if ($this->uri) {
clearstatcache(true, $this->uri);
}
$stats = fstat($this->stream);
if (isset($stats['size'])) {
$this->size = $stats['size'];
return $this->size;
}
}
public function tell()
{
$result = ftell($this->stream);
if ($result === false) {
throw new \RuntimeException('Unable to determine stream position');
}
return $result;
}
public function eof()
{
return !$this->stream || feof($this->stream);
}
public function isSeekable()
{
return $this->seekable;
}
public function seek($offset, $whence = SEEK_SET)
{
if (!$this->seekable) {
throw new \RuntimeException('Stream is not seekable');
}
if (fseek($this->stream, $offset, $whence) === -1) {
throw new \RuntimeException('Unable to seek to stream position '.$offset.' with whence '.var_export($whence, true));
}
}
public function rewind()
{
$this->seek(0);
}
public function isWritable()
{
return $this->writable;
}
public function write($string)
{
if (!$this->writable) {
throw new \RuntimeException('Cannot write to a non-writable stream');
}
// We can't know the size after writing anything
$this->size = null;
$result = fwrite($this->stream, $string);
if ($result === false) {
throw new \RuntimeException('Unable to write to stream');
}
return $result;
}
public function isReadable()
{
return $this->readable;
}
public function read($length)
{
if (!$this->readable) {
throw new \RuntimeException('Cannot read from non-readable stream');
}
return fread($this->stream, $length);
}
public function getContents()
{
if (!isset($this->stream)) {
throw new \RuntimeException('Unable to read stream contents');
}
$contents = stream_get_contents($this->stream);
if ($contents === false) {
throw new \RuntimeException('Unable to read stream contents');
}
return $contents;
}
public function getMetadata($key = null)
{
if (!isset($this->stream)) {
return $key ? null : [];
}
if ($key === null) {
return stream_get_meta_data($this->stream);
}
$meta = stream_get_meta_data($this->stream);
return isset($meta[$key]) ? $meta[$key] : null;
}
}
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