wordpress-seo / vendor_prefixed / guzzlehttp / psr7 / src / AppendStream.php

AppendStream.php in Yoast SEO – Advanced SEO with real-time guidance and built-in AI 27.9, at vendor_prefixed/guzzlehttp/psr7/src/AppendStream.php

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1	<?php
2
3	declare (strict_types=1);
4	namespace YoastSEO_Vendor\GuzzleHttp\Psr7;
5
6	use YoastSEO_Vendor\Psr\Http\Message\StreamInterface;
7	/**
8	* Reads from multiple streams, one after the other.
9	*
10	* This is a read-only stream decorator.
11	*/
12	final class AppendStream implements \YoastSEO_Vendor\Psr\Http\Message\StreamInterface
13	{
14	/** @var StreamInterface[] Streams being decorated */
15	private $streams = [];
16	/** @var bool */
17	private $seekable = \true;
18	/** @var int */
19	private $current = 0;
20	/** @var int */
21	private $pos = 0;
22	/**
23	* @param StreamInterface[] $streams Streams to decorate. Each stream must
24	* be readable.
25	*/
26	public function __construct(array $streams = [])
27	{
28	foreach ($streams as $stream) {
29	$this->addStream($stream);
30	}
31	}
32	public function __toString() : string
33	{
34	try {
35	$this->rewind();
36	return $this->getContents();
37	} catch (\Throwable $e) {
38	if (\PHP_VERSION_ID >= 70400) {
39	throw $e;
40	}
41	\trigger_error(\sprintf('%s::__toString exception: %s', self::class, (string) $e), \E_USER_ERROR);
42	return '';
43	}
44	}
45	/**
46	* Add a stream to the AppendStream
47	*
48	* @param StreamInterface $stream Stream to append. Must be readable.
49	*
50	* @throws \InvalidArgumentException if the stream is not readable
51	*/
52	public function addStream(\YoastSEO_Vendor\Psr\Http\Message\StreamInterface $stream) : void
53	{
54	if (!$stream->isReadable()) {
55	throw new \InvalidArgumentException('Each stream must be readable');
56	}
57	// The stream is only seekable if all streams are seekable
58	if (!$stream->isSeekable()) {
59	$this->seekable = \false;
60	}
61	$this->streams[] = $stream;
62	}
63	public function getContents() : string
64	{
65	return \YoastSEO_Vendor\GuzzleHttp\Psr7\Utils::copyToString($this);
66	}
67	/**
68	* Closes each attached stream.
69	*/
70	public function close() : void
71	{
72	$this->pos = $this->current = 0;
73	$this->seekable = \true;
74	foreach ($this->streams as $stream) {
75	$stream->close();
76	}
77	$this->streams = [];
78	}
79	/**
80	* Detaches each attached stream.
81	*
82	* Returns null as it's not clear which underlying stream resource to return.
83	*/
84	public function detach()
85	{
86	$this->pos = $this->current = 0;
87	$this->seekable = \true;
88	foreach ($this->streams as $stream) {
89	$stream->detach();
90	}
91	$this->streams = [];
92	return null;
93	}
94	public function tell() : int
95	{
96	return $this->pos;
97	}
98	/**
99	* Tries to calculate the size by adding the size of each stream.
100	*
101	* If any of the streams do not return a valid number, then the size of the
102	* append stream cannot be determined and null is returned.
103	*/
104	public function getSize() : ?int
105	{
106	$size = 0;
107	foreach ($this->streams as $stream) {
108	$s = $stream->getSize();
109	if ($s === null) {
110	return null;
111	}
112	$size += $s;
113	}
114	return $size;
115	}
116	public function eof() : bool
117	{
118	return !$this->streams \|\| $this->current >= \count($this->streams) - 1 && $this->streams[$this->current]->eof();
119	}
120	public function rewind() : void
121	{
122	$this->seek(0);
123	}
124	/**
125	* Attempts to seek to the given position. Only supports SEEK_SET.
126	*/
127	public function seek($offset, $whence = \SEEK_SET) : void
128	{
129	if (!$this->seekable) {
130	throw new \RuntimeException('This AppendStream is not seekable');
131	} elseif ($whence !== \SEEK_SET) {
132	throw new \RuntimeException('The AppendStream can only seek with SEEK_SET');
133	}
134	$this->pos = $this->current = 0;
135	// Rewind each stream
136	foreach ($this->streams as $i => $stream) {
137	try {
138	$stream->rewind();
139	} catch (\Exception $e) {
140	throw new \RuntimeException('Unable to seek stream ' . $i . ' of the AppendStream', 0, $e);
141	}
142	}
143	// Seek to the actual position by reading from each stream
144	while ($this->pos < $offset && !$this->eof()) {
145	$result = $this->read(\min(8096, $offset - $this->pos));
146	if ($result === '') {
147	break;
148	}
149	}
150	}
151	/**
152	* Reads from all of the appended streams until the length is met or EOF.
153	*/
154	public function read($length) : string
155	{
156	$buffer = '';
157	$total = \count($this->streams) - 1;
158	$remaining = $length;
159	$progressToNext = \false;
160	while ($remaining > 0) {
161	// Progress to the next stream if needed.
162	if ($progressToNext \|\| $this->streams[$this->current]->eof()) {
163	$progressToNext = \false;
164	if ($this->current === $total) {
165	break;
166	}
167	++$this->current;
168	}
169	$result = $this->streams[$this->current]->read($remaining);
170	if ($result === '') {
171	$progressToNext = \true;
172	continue;
173	}
174	$buffer .= $result;
175	$remaining = $length - \strlen($buffer);
176	}
177	$this->pos += \strlen($buffer);
178	return $buffer;
179	}
180	public function isReadable() : bool
181	{
182	return \true;
183	}
184	public function isWritable() : bool
185	{
186	return \false;
187	}
188	public function isSeekable() : bool
189	{
190	return $this->seekable;
191	}
192	public function write($string) : int
193	{
194	throw new \RuntimeException('Cannot write to an AppendStream');
195	}
196	/**
197	* @return mixed
198	*/
199	public function getMetadata($key = null)
200	{
201	return $key ? null : [];
202	}
203	}
204