media-cloud-sync / includes / sdk / s3 / GuzzleHttp / Psr7 / LimitStream.php

LimitStream.php in Media Cloud Sync 1.2.13, at includes/sdk/s3/GuzzleHttp/Psr7/LimitStream.php

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1	<?php
2
3	declare (strict_types=1);
4	namespace Dudlewebs\WPMCS\s3\GuzzleHttp\Psr7;
5
6	use Dudlewebs\WPMCS\s3\Psr\Http\Message\StreamInterface;
7	/**
8	* Decorator used to return only a subset of a stream.
9	*/
10	final class LimitStream implements StreamInterface
11	{
12	use StreamDecoratorTrait;
13	/** @var int Offset to start reading from */
14	private $offset;
15	/** @var int Limit the number of bytes that can be read */
16	private $limit;
17	/** @var StreamInterface */
18	private $stream;
19	/**
20	* @param StreamInterface $stream Stream to wrap
21	* @param int $limit Total number of bytes to allow to be read
22	* from the stream. Pass -1 for no limit.
23	* @param int $offset Position to seek to before reading (only
24	* works on seekable streams).
25	*/
26	public function __construct(StreamInterface $stream, int $limit = -1, int $offset = 0)
27	{
28	$this->stream = $stream;
29	$this->setLimit($limit);
30	$this->setOffset($offset);
31	}
32	public function eof() : bool
33	{
34	// Always return true if the underlying stream is EOF
35	if ($this->stream->eof()) {
36	return \true;
37	}
38	// No limit and the underlying stream is not at EOF
39	if ($this->limit === -1) {
40	return \false;
41	}
42	return $this->stream->tell() >= $this->offset + $this->limit;
43	}
44	/**
45	* Returns the size of the limited subset of data
46	*/
47	public function getSize() : ?int
48	{
49	if (null === ($length = $this->stream->getSize())) {
50	return null;
51	} elseif ($this->limit === -1) {
52	return $length - $this->offset;
53	} else {
54	return \min($this->limit, $length - $this->offset);
55	}
56	}
57	/**
58	* Allow for a bounded seek on the read limited stream
59	*/
60	public function seek($offset, $whence = \SEEK_SET) : void
61	{
62	if ($whence !== \SEEK_SET \|\| $offset < 0) {
63	throw new \RuntimeException(\sprintf('Cannot seek to offset %s with whence %s', $offset, $whence));
64	}
65	$offset += $this->offset;
66	if ($this->limit !== -1) {
67	if ($offset > $this->offset + $this->limit) {
68	$offset = $this->offset + $this->limit;
69	}
70	}
71	$this->stream->seek($offset);
72	}
73	/**
74	* Give a relative tell()
75	*/
76	public function tell() : int
77	{
78	return $this->stream->tell() - $this->offset;
79	}
80	/**
81	* Set the offset to start limiting from
82	*
83	* @param int $offset Offset to seek to and begin byte limiting from
84	*
85	* @throws \RuntimeException if the stream cannot be seeked.
86	*/
87	public function setOffset(int $offset) : void
88	{
89	$current = $this->stream->tell();
90	if ($current !== $offset) {
91	// If the stream cannot seek to the offset position, then read to it
92	if ($this->stream->isSeekable()) {
93	$this->stream->seek($offset);
94	} elseif ($current > $offset) {
95	throw new \RuntimeException("Could not seek to stream offset {$offset}");
96	} else {
97	$this->stream->read($offset - $current);
98	}
99	}
100	$this->offset = $offset;
101	}
102	/**
103	* Set the limit of bytes that the decorator allows to be read from the
104	* stream.
105	*
106	* @param int $limit Number of bytes to allow to be read from the stream.
107	* Use -1 for no limit.
108	*/
109	public function setLimit(int $limit) : void
110	{
111	$this->limit = $limit;
112	}
113	public function read($length) : string
114	{
115	if ($this->limit === -1) {
116	return $this->stream->read($length);
117	}
118	// Check if the current position is less than the total allowed
119	// bytes + original offset
120	$remaining = $this->offset + $this->limit - $this->stream->tell();
121	if ($remaining > 0) {
122	// Only return the amount of requested data, ensuring that the byte
123	// limit is not exceeded
124	return $this->stream->read(\min($remaining, $length));
125	}
126	return '';
127	}
128	}
129