depicter / modules / GuzzleHttp / Psr7 / AppendStream.php

AppendStream.php in Depicter — Popup & Slider Builder trunk, at modules/GuzzleHttp/Psr7/AppendStream.php

249 lines 5.8 KB

Raw Download Zip

1	<?php
2
3	declare(strict_types=1);
4
5	namespace Depicter\GuzzleHttp\Psr7;
6
7	use Depicter\Psr\Http\Message\StreamInterface;
8
9	/**
10	* Reads from multiple streams, one after the other.
11	*
12	* This is a read-only stream decorator.
13	*/
14	final class AppendStream implements StreamInterface
15	{
16	/** @var StreamInterface[] Streams being decorated */
17	private $streams = [];
18
19	/** @var bool */
20	private $seekable = true;
21
22	/** @var int */
23	private $current = 0;
24
25	/** @var int */
26	private $pos = 0;
27
28	/**
29	* @param StreamInterface[] $streams Streams to decorate. Each stream must
30	* be readable.
31	*/
32	public function __construct(array $streams = [])
33	{
34	foreach ($streams as $stream) {
35	$this->addStream($stream);
36	}
37	}
38
39	public function __toString(): string
40	{
41	try {
42	$this->rewind();
43
44	return $this->getContents();
45	} catch (\Throwable $e) {
46	if (\PHP_VERSION_ID >= 70400) {
47	throw $e;
48	}
49	trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR);
50
51	return '';
52	}
53	}
54
55	/**
56	* Add a stream to the AppendStream
57	*
58	* @param StreamInterface $stream Stream to append. Must be readable.
59	*
60	* @throws \InvalidArgumentException if the stream is not readable
61	*/
62	public function addStream(StreamInterface $stream): void
63	{
64	if (!$stream->isReadable()) {
65	throw new \InvalidArgumentException('Each stream must be readable');
66	}
67
68	// The stream is only seekable if all streams are seekable
69	if (!$stream->isSeekable()) {
70	$this->seekable = false;
71	}
72
73	$this->streams[] = $stream;
74	}
75
76	public function getContents(): string
77	{
78	return Utils::copyToString($this);
79	}
80
81	/**
82	* Closes each attached stream.
83	*/
84	public function close(): void
85	{
86	$this->pos = $this->current = 0;
87	$this->seekable = true;
88
89	foreach ($this->streams as $stream) {
90	$stream->close();
91	}
92
93	$this->streams = [];
94	}
95
96	/**
97	* Detaches each attached stream.
98	*
99	* Returns null as it's not clear which underlying stream resource to return.
100	*/
101	public function detach()
102	{
103	$this->pos = $this->current = 0;
104	$this->seekable = true;
105
106	foreach ($this->streams as $stream) {
107	$stream->detach();
108	}
109
110	$this->streams = [];
111
112	return null;
113	}
114
115	public function tell(): int
116	{
117	return $this->pos;
118	}
119
120	/**
121	* Tries to calculate the size by adding the size of each stream.
122	*
123	* If any of the streams do not return a valid number, then the size of the
124	* append stream cannot be determined and null is returned.
125	*/
126	public function getSize(): ?int
127	{
128	$size = 0;
129
130	foreach ($this->streams as $stream) {
131	$s = $stream->getSize();
132	if ($s === null) {
133	return null;
134	}
135	$size += $s;
136	}
137
138	return $size;
139	}
140
141	public function eof(): bool
142	{
143	return !$this->streams
144	\|\| ($this->current >= count($this->streams) - 1
145	&& $this->streams[$this->current]->eof());
146	}
147
148	public function rewind(): void
149	{
150	$this->seek(0);
151	}
152
153	/**
154	* Attempts to seek to the given position. Only supports SEEK_SET.
155	*/
156	public function seek($offset, $whence = SEEK_SET): void
157	{
158	if (!$this->seekable) {
159	throw new \RuntimeException('This AppendStream is not seekable');
160	} elseif ($whence !== SEEK_SET) {
161	throw new \RuntimeException('The AppendStream can only seek with SEEK_SET');
162	}
163
164	$this->pos = $this->current = 0;
165
166	// Rewind each stream
167	foreach ($this->streams as $i => $stream) {
168	try {
169	$stream->rewind();
170	} catch (\Exception $e) {
171	throw new \RuntimeException('Unable to seek stream '
172	.$i.' of the AppendStream', 0, $e);
173	}
174	}
175
176	// Seek to the actual position by reading from each stream
177	while ($this->pos < $offset && !$this->eof()) {
178	$result = $this->read(min(8096, $offset - $this->pos));
179	if ($result === '') {
180	break;
181	}
182	}
183	}
184
185	/**
186	* Reads from all of the appended streams until the length is met or EOF.
187	*/
188	public function read($length): string
189	{
190	$buffer = '';
191	$total = count($this->streams) - 1;
192	$remaining = $length;
193	$progressToNext = false;
194
195	while ($remaining > 0) {
196	// Progress to the next stream if needed.
197	if ($progressToNext \|\| $this->streams[$this->current]->eof()) {
198	$progressToNext = false;
199	if ($this->current === $total) {
200	break;
201	}
202	++$this->current;
203	}
204
205	$result = $this->streams[$this->current]->read($remaining);
206
207	if ($result === '') {
208	$progressToNext = true;
209	continue;
210	}
211
212	$buffer .= $result;
213	$remaining = $length - strlen($buffer);
214	}
215
216	$this->pos += strlen($buffer);
217
218	return $buffer;
219	}
220
221	public function isReadable(): bool
222	{
223	return true;
224	}
225
226	public function isWritable(): bool
227	{
228	return false;
229	}
230
231	public function isSeekable(): bool
232	{
233	return $this->seekable;
234	}
235
236	public function write($string): int
237	{
238	throw new \RuntimeException('Cannot write to an AppendStream');
239	}
240
241	/**
242	* @return mixed
243	*/
244	public function getMetadata($key = null)
245	{
246	return $key ? null : [];
247	}
248	}
249