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Edit File : LimitStream.php \| Size : 4.13 KB
<?php namespace GuzzleHttp\Psr7; use Psr\Http\Message\StreamInterface; /** * Decorator used to return only a subset of a stream. * * @final / class LimitStream implements StreamInterface { use StreamDecoratorTrait; /* @var int Offset to start reading from / private $offset; /* @var int Limit the number of bytes that can be read / private $limit; /* * @param StreamInterface $stream Stream to wrap * @param int $limit Total number of bytes to allow to be read * from the stream. Pass -1 for no limit. * @param int $offset Position to seek to before reading (only * works on seekable streams). / public function __construct( StreamInterface $stream, $limit = -1, $offset = 0 ) { $this->stream = $stream; $this->setLimit($limit); $this->setOffset($offset); } public function eof() { // Always return true if the underlying stream is EOF if ($this->stream->eof()) { return true; } // No limit and the underlying stream is not at EOF if ($this->limit == -1) { return false; } return $this->stream->tell() >= $this->offset + $this->limit; } /* * Returns the size of the limited subset of data * {@inheritdoc} / public function getSize() { if (null === ($length = $this->stream->getSize())) { return null; } elseif ($this->limit == -1) { return $length - $this->offset; } else { return min($this->limit, $length - $this->offset); } } /* * Allow for a bounded seek on the read limited stream * {@inheritdoc} / public function seek($offset, $whence = SEEK_SET) { if ($whence !== SEEK_SET \|\| $offset < 0) { throw new \RuntimeException(sprintf( 'Cannot seek to offset %s with whence %s', $offset, $whence )); } $offset += $this->offset; if ($this->limit !== -1) { if ($offset > $this->offset + $this->limit) { $offset = $this->offset + $this->limit; } } $this->stream->seek($offset); } /* * Give a relative tell() * {@inheritdoc} / public function tell() { return $this->stream->tell() - $this->offset; } /* * Set the offset to start limiting from * * @param int $offset Offset to seek to and begin byte limiting from * * @throws \RuntimeException if the stream cannot be seeked. / public function setOffset($offset) { $current = $this->stream->tell(); if ($current !== $offset) { // If the stream cannot seek to the offset position, then read to it if ($this->stream->isSeekable()) { $this->stream->seek($offset); } elseif ($current > $offset) { throw new \RuntimeException("Could not seek to stream offset $offset"); } else { $this->stream->read($offset - $current); } } $this->offset = $offset; } /* * Set the limit of bytes that the decorator allows to be read from the * stream. * * @param int $limit Number of bytes to allow to be read from the stream. * Use -1 for no limit. */ public function setLimit($limit) { $this->limit = $limit; } public function read($length) { if ($this->limit == -1) { return $this->stream->read($length); } // Check if the current position is less than the total allowed // bytes + original offset $remaining = ($this->offset + $this->limit) - $this->stream->tell(); if ($remaining > 0) { // Only return the amount of requested data, ensuring that the byte // limit is not exceeded return $this->stream->read(min($remaining, $length)); } return ''; } } Back

Edit File : LimitStream.php | Size : 4.13 KB

<?php

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

/**
 * Decorator used to return only a subset of a stream.
 *
 * @final
 */
class LimitStream implements StreamInterface
{
    use StreamDecoratorTrait;

/** @var int Offset to start reading from */
    private $offset;

/** @var int Limit the number of bytes that can be read */
    private $limit;

/**
     * @param StreamInterface $stream Stream to wrap
     * @param int             $limit  Total number of bytes to allow to be read
     *                                from the stream. Pass -1 for no limit.
     * @param int             $offset Position to seek to before reading (only
     *                                works on seekable streams).
     */
    public function __construct(
        StreamInterface $stream,
        $limit = -1,
        $offset = 0
    ) {
        $this->stream = $stream;
        $this->setLimit($limit);
        $this->setOffset($offset);
    }

public function eof()
    {
        // Always return true if the underlying stream is EOF
        if ($this->stream->eof()) {
            return true;
        }

// No limit and the underlying stream is not at EOF
        if ($this->limit == -1) {
            return false;
        }

return $this->stream->tell() >= $this->offset + $this->limit;
    }

/**
     * Returns the size of the limited subset of data
     * {@inheritdoc}
     */
    public function getSize()
    {
        if (null === ($length = $this->stream->getSize())) {
            return null;
        } elseif ($this->limit == -1) {
            return $length - $this->offset;
        } else {
            return min($this->limit, $length - $this->offset);
        }
    }

/**
     * Allow for a bounded seek on the read limited stream
     * {@inheritdoc}
     */
    public function seek($offset, $whence = SEEK_SET)
    {
        if ($whence !== SEEK_SET || $offset < 0) {
            throw new \RuntimeException(sprintf(
                'Cannot seek to offset %s with whence %s',
                $offset,
                $whence
            ));
        }

$offset += $this->offset;

if ($this->limit !== -1) {
            if ($offset > $this->offset + $this->limit) {
                $offset = $this->offset + $this->limit;
            }
        }

$this->stream->seek($offset);
    }

/**
     * Give a relative tell()
     * {@inheritdoc}
     */
    public function tell()
    {
        return $this->stream->tell() - $this->offset;
    }

/**
     * Set the offset to start limiting from
     *
     * @param int $offset Offset to seek to and begin byte limiting from
     *
     * @throws \RuntimeException if the stream cannot be seeked.
     */
    public function setOffset($offset)
    {
        $current = $this->stream->tell();

if ($current !== $offset) {
            // If the stream cannot seek to the offset position, then read to it
            if ($this->stream->isSeekable()) {
                $this->stream->seek($offset);
            } elseif ($current > $offset) {
                throw new \RuntimeException("Could not seek to stream offset $offset");
            } else {
                $this->stream->read($offset - $current);
            }
        }

$this->offset = $offset;
    }

/**
     * Set the limit of bytes that the decorator allows to be read from the
     * stream.
     *
     * @param int $limit Number of bytes to allow to be read from the stream.
     *                   Use -1 for no limit.
     */
    public function setLimit($limit)
    {
        $this->limit = $limit;
    }

public function read($length)
    {
        if ($this->limit == -1) {
            return $this->stream->read($length);
        }

// Check if the current position is less than the total allowed
        // bytes + original offset
        $remaining = ($this->offset + $this->limit) - $this->stream->tell();
        if ($remaining > 0) {
            // Only return the amount of requested data, ensuring that the byte
            // limit is not exceeded
            return $this->stream->read(min($remaining, $length));
        }

return '';
    }
}

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