<?php
namespace PhpZip\IO\Stream;
use Psr\Http\Message\StreamInterface;
/**
* Implement PSR Message Stream.
*/
class ResponseStream implements StreamInterface
{
/** @var array */
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,
],
];
/** @var resource */
private $stream;
/** @var int|null */
private $size;
/** @var bool */
private $seekable;
/** @var bool */
private $readable;
/** @var bool */
private $writable;
/** @var string|null */
private $uri;
/**
* @param resource $stream stream resource to wrap
*
* @throws \InvalidArgumentException if the stream is not a stream resource
*/
public function __construct($stream)
{
if (!\is_resource($stream)) {
throw new \InvalidArgumentException('Stream must be a resource');
}
$this->stream = $stream;
$meta = stream_get_meta_data($this->stream);
$this->seekable = $meta['seekable'];
$this->readable = isset(self::$readWriteHash['read'][$meta['mode']]);
$this->writable = isset(self::$readWriteHash['write'][$meta['mode']]);
$this->uri = $this->getMetadata('uri');
}
/**
* Get stream metadata as an associative array or retrieve a specific key.
*
* The keys returned are identical to the keys returned from PHP's
* stream_get_meta_data() function.
*
* @see http://php.net/manual/en/function.stream-get-meta-data.php
*
* @param string $key specific metadata to retrieve
*
* @return array|mixed|null Returns an associative array if no key is
* provided. Returns a specific key value if a key is provided and the
* value is found, or null if the key is not found.
*/
public function getMetadata($key = null)
{
if (!$this->stream) {
return $key ? null : [];
}
$meta = stream_get_meta_data($this->stream);
return isset($meta[$key]) ? $meta[$key] : null;
}
/**
* Reads all data from the stream into a string, from the beginning to end.
*
* This method MUST attempt to seek to the beginning of the stream before
* reading data and read the stream until the end is reached.
*
* Warning: This could attempt to load a large amount of data into memory.
*
* This method MUST NOT raise an exception in order to conform with PHP's
* string casting operations.
*
* @see http://php.net/manual/en/language.oop5.magic.php#object.tostring
*
* @return string
*/
public function __toString()
{
if (!$this->stream) {
return '';
}
$this->rewind();
return (string) stream_get_contents($this->stream);
}
/**
* Seek to the beginning of the stream.
*
* If the stream is not seekable, this method will raise an exception;
* otherwise, it will perform a seek(0).
*
* @throws \RuntimeException on failure
*
* @see http://www.php.net/manual/en/function.fseek.php
* @see seek()
*/
public function rewind()
{
$this->seekable && rewind($this->stream);
}
/**
* Get the size of the stream if known.
*
* @return int|null returns the size in bytes if known, or null if unknown
*/
public function getSize()
{
if ($this->size !== null) {
return $this->size;
}
if (!$this->stream) {
return null;
}
// Clear the stat cache if the stream has a URI
if ($this->uri !== null) {
clearstatcache(true, $this->uri);
}
$stats = fstat($this->stream);
if (isset($stats['size'])) {
$this->size = $stats['size'];
return $this->size;
}
return null;
}
/**
* Returns the current position of the file read/write pointer.
*
* @throws \RuntimeException on error
*
* @return int Position of the file pointer
*/
public function tell()
{
return $this->stream ? ftell($this->stream) : false;
}
/**
* Returns true if the stream is at the end of the stream.
*
* @return bool
*/
public function eof()
{
return !$this->stream || feof($this->stream);
}
/**
* Returns whether or not the stream is seekable.
*
* @return bool
*/
public function isSeekable()
{
return $this->seekable;
}
/**
* Seek to a position in the stream.
*
* @see http://www.php.net/manual/en/function.fseek.php
*
* @param int $offset Stream offset
* @param int $whence Specifies how the cursor position will be calculated
* based on the seek offset. Valid values are identical to the built-in
* PHP $whence values for `fseek()`. SEEK_SET: Set position equal to
* offset bytes SEEK_CUR: Set position to current location plus offset
* SEEK_END: Set position to end-of-stream plus offset.
*
* @throws \RuntimeException on failure
*/
public function seek($offset, $whence = \SEEK_SET)
{
$this->seekable && fseek($this->stream, $offset, $whence);
}
/**
* Returns whether or not the stream is writable.
*
* @return bool
*/
public function isWritable()
{
return $this->writable;
}
/**
* Write data to the stream.
*
* @param string $string the string that is to be written
*
* @throws \RuntimeException on failure
*
* @return int returns the number of bytes written to the stream
*/
public function write($string)
{
$this->size = null;
return $this->writable ? fwrite($this->stream, $string) : false;
}
/**
* Returns whether or not the stream is readable.
*
* @return bool
*/
public function isReadable()
{
return $this->readable;
}
/**
* Read data from the stream.
*
* @param int $length Read up to $length bytes from the object and return
* them. Fewer than $length bytes may be returned if underlying stream
* call returns fewer bytes.
*
* @throws \RuntimeException if an error occurs
*
* @return string returns the data read from the stream, or an empty string
* if no bytes are available
*/
public function read($length)
{
return $this->readable ? fread($this->stream, $length) : '';
}
/**
* Returns the remaining contents in a string.
*
* @throws \RuntimeException if unable to read or an error occurs while
* reading
*
* @return string
*/
public function getContents()
{
return $this->stream ? stream_get_contents($this->stream) : '';
}
/**
* Closes the stream when the destructed.
*/
public function __destruct()
{
$this->close();
}
/**
* Closes the stream and any underlying resources.
*/
public function close()
{
if (\is_resource($this->stream)) {
fclose($this->stream);
}
$this->detach();
}
/**
* Separates any underlying resources from the stream.
*
* After the stream has been detached, the stream is in an unusable state.
*
* @return resource|null Underlying PHP stream, if any
*/
public function detach()
{
$result = $this->stream;
$this->stream = null;
$this->size = null;
$this->uri = null;
$this->readable = false;
$this->writable = false;
$this->seekable = false;
return $result;
}
}