107 lines
2.9 KiB
PHP
107 lines
2.9 KiB
PHP
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<?php
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namespace Guzzle\Http;
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/**
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* EntityBody decorator used to return only a subset of an entity body
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*/
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class ReadLimitEntityBody extends AbstractEntityBodyDecorator
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{
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/** @var int Limit the number of bytes that can be read */
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protected $limit;
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/** @var int Offset to start reading from */
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protected $offset;
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/**
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* @param EntityBodyInterface $body Body to wrap
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* @param int $limit Total number of bytes to allow to be read from the stream
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* @param int $offset Position to seek to before reading (only works on seekable streams)
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*/
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public function __construct(EntityBodyInterface $body, $limit, $offset = 0)
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{
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parent::__construct($body);
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$this->setLimit($limit)->setOffset($offset);
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$this->body->seek($offset);
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}
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/**
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* Returns only a subset of the decorated entity body when cast as a string
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* {@inheritdoc}
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*/
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public function __toString()
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{
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return substr((string) $this->body, $this->offset, $this->limit) ?: '';
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}
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public function isConsumed()
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{
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return (($this->offset + $this->limit) - $this->body->ftell()) <= 0;
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}
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/**
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* Returns the Content-Length of the limited subset of data
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* {@inheritdoc}
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*/
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public function getContentLength()
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{
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$length = $this->body->getContentLength();
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return $length === false
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? $this->limit
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: min($this->limit, min($length, $this->offset + $this->limit) - $this->offset);
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}
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/**
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* Allow for a bounded seek on the read limited entity body
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* {@inheritdoc}
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*/
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public function seek($offset, $whence = SEEK_SET)
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{
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return $whence === SEEK_SET
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? $this->body->seek(max($this->offset, min($this->offset + $this->limit, $offset)))
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: false;
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}
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/**
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* Set the offset to start limiting from
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*
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* @param int $offset Offset to seek to and begin byte limiting from
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*
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* @return self
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*/
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public function setOffset($offset)
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{
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$this->body->seek($offset);
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$this->offset = $offset;
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return $this;
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}
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/**
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* Set the limit of bytes that the decorator allows to be read from the stream
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*
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* @param int $limit Total number of bytes to allow to be read from the stream
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*
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* @return self
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*/
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public function setLimit($limit)
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{
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$this->limit = $limit;
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return $this;
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}
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public function read($length)
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{
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// Check if the current position is less than the total allowed bytes + original offset
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$remaining = ($this->offset + $this->limit) - $this->body->ftell();
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if ($remaining > 0) {
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// Only return the amount of requested data, ensuring that the byte limit is not exceeded
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return $this->body->read(min($remaining, $length));
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} else {
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return false;
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}
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}
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}
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