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Edit File : AppendStream.php \| Size : 5.59 KB
<?php namespace GuzzleHttp\Psr7; use Psr\Http\Message\StreamInterface; /** * Reads from multiple streams, one after the other. * * This is a read-only stream decorator. / class AppendStream implements StreamInterface { /* @var StreamInterface[] Streams being decorated / private $streams = []; private $seekable = true; private $current = 0; private $pos = 0; /* * @param StreamInterface[] $streams Streams to decorate. Each stream must * be readable. / public function __construct(array $streams = []) { foreach ($streams as $stream) { $this->addStream($stream); } } public function __toString() { try { $this->rewind(); return $this->getContents(); } catch (\Exception $e) { return ''; } } /* * Add a stream to the AppendStream * * @param StreamInterface $stream Stream to append. Must be readable. * * @throws \InvalidArgumentException if the stream is not readable / public function addStream(StreamInterface $stream) { if (!$stream->isReadable()) { throw new \InvalidArgumentException('Each stream must be readable'); } // The stream is only seekable if all streams are seekable if (!$stream->isSeekable()) { $this->seekable = false; } $this->streams[] = $stream; } public function getContents() { return copy_to_string($this); } /* * Closes each attached stream. * * {@inheritdoc} / public function close() { $this->pos = $this->current = 0; $this->seekable = true; foreach ($this->streams as $stream) { $stream->close(); } $this->streams = []; } /* * Detaches each attached stream. * * Returns null as it's not clear which underlying stream resource to return. * * {@inheritdoc} / public function detach() { $this->pos = $this->current = 0; $this->seekable = true; foreach ($this->streams as $stream) { $stream->detach(); } $this->streams = []; } public function tell() { return $this->pos; } /* * Tries to calculate the size by adding the size of each stream. * * If any of the streams do not return a valid number, then the size of the * append stream cannot be determined and null is returned. * * {@inheritdoc} / public function getSize() { $size = 0; foreach ($this->streams as $stream) { $s = $stream->getSize(); if ($s === null) { return null; } $size += $s; } return $size; } public function eof() { return !$this->streams \|\| ($this->current >= count($this->streams) - 1 && $this->streams[$this->current]->eof()); } public function rewind() { $this->seek(0); } /* * Attempts to seek to the given position. Only supports SEEK_SET. * * {@inheritdoc} / public function seek($offset, $whence = SEEK_SET) { if (!$this->seekable) { throw new \RuntimeException('This AppendStream is not seekable'); } elseif ($whence !== SEEK_SET) { throw new \RuntimeException('The AppendStream can only seek with SEEK_SET'); } $this->pos = $this->current = 0; // Rewind each stream foreach ($this->streams as $i => $stream) { try { $stream->rewind(); } catch (\Exception $e) { throw new \RuntimeException('Unable to seek stream ' . $i . ' of the AppendStream', 0, $e); } } // Seek to the actual position by reading from each stream while ($this->pos < $offset && !$this->eof()) { $result = $this->read(min(8096, $offset - $this->pos)); if ($result === '') { break; } } } /* * Reads from all of the appended streams until the length is met or EOF. * * {@inheritdoc} */ public function read($length) { $buffer = ''; $total = count($this->streams) - 1; $remaining = $length; $progressToNext = false; while ($remaining > 0) { // Progress to the next stream if needed. if ($progressToNext \|\| $this->streams[$this->current]->eof()) { $progressToNext = false; if ($this->current === $total) { break; } $this->current++; } $result = $this->streams[$this->current]->read($remaining); // Using a loose comparison here to match on '', false, and null if ($result == null) { $progressToNext = true; continue; } $buffer .= $result; $remaining = $length - strlen($buffer); } $this->pos += strlen($buffer); return $buffer; } public function isReadable() { return true; } public function isWritable() { return false; } public function isSeekable() { return $this->seekable; } public function write($string) { throw new \RuntimeException('Cannot write to an AppendStream'); } public function getMetadata($key = null) { return $key ? null : []; } } Back

Edit File : AppendStream.php | Size : 5.59 KB

<?php
namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

/**
 * Reads from multiple streams, one after the other.
 *
 * This is a read-only stream decorator.
 */
class AppendStream implements StreamInterface
{
    /** @var StreamInterface[] Streams being decorated */
    private $streams = [];

private $seekable = true;
    private $current = 0;
    private $pos = 0;

/**
     * @param StreamInterface[] $streams Streams to decorate. Each stream must
     *                                   be readable.
     */
    public function __construct(array $streams = [])
    {
        foreach ($streams as $stream) {
            $this->addStream($stream);
        }
    }

public function __toString()
    {
        try {
            $this->rewind();
            return $this->getContents();
        } catch (\Exception $e) {
            return '';
        }
    }

/**
     * Add a stream to the AppendStream
     *
     * @param StreamInterface $stream Stream to append. Must be readable.
     *
     * @throws \InvalidArgumentException if the stream is not readable
     */
    public function addStream(StreamInterface $stream)
    {
        if (!$stream->isReadable()) {
            throw new \InvalidArgumentException('Each stream must be readable');
        }

// The stream is only seekable if all streams are seekable
        if (!$stream->isSeekable()) {
            $this->seekable = false;
        }

$this->streams[] = $stream;
    }

public function getContents()
    {
        return copy_to_string($this);
    }

/**
     * Closes each attached stream.
     *
     * {@inheritdoc}
     */
    public function close()
    {
        $this->pos = $this->current = 0;
        $this->seekable = true;

foreach ($this->streams as $stream) {
            $stream->close();
        }

$this->streams = [];
    }

/**
     * Detaches each attached stream.
     *
     * Returns null as it's not clear which underlying stream resource to return.
     *
     * {@inheritdoc}
     */
    public function detach()
    {
        $this->pos = $this->current = 0;
        $this->seekable = true;

foreach ($this->streams as $stream) {
            $stream->detach();
        }

$this->streams = [];
    }

public function tell()
    {
        return $this->pos;
    }

/**
     * Tries to calculate the size by adding the size of each stream.
     *
     * If any of the streams do not return a valid number, then the size of the
     * append stream cannot be determined and null is returned.
     *
     * {@inheritdoc}
     */
    public function getSize()
    {
        $size = 0;

foreach ($this->streams as $stream) {
            $s = $stream->getSize();
            if ($s === null) {
                return null;
            }
            $size += $s;
        }

return $size;
    }

public function eof()
    {
        return !$this->streams ||
            ($this->current >= count($this->streams) - 1 &&
             $this->streams[$this->current]->eof());
    }

public function rewind()
    {
        $this->seek(0);
    }

/**
     * Attempts to seek to the given position. Only supports SEEK_SET.
     *
     * {@inheritdoc}
     */
    public function seek($offset, $whence = SEEK_SET)
    {
        if (!$this->seekable) {
            throw new \RuntimeException('This AppendStream is not seekable');
        } elseif ($whence !== SEEK_SET) {
            throw new \RuntimeException('The AppendStream can only seek with SEEK_SET');
        }

$this->pos = $this->current = 0;

// Rewind each stream
        foreach ($this->streams as $i => $stream) {
            try {
                $stream->rewind();
            } catch (\Exception $e) {
                throw new \RuntimeException('Unable to seek stream '
                    . $i . ' of the AppendStream', 0, $e);
            }
        }

// Seek to the actual position by reading from each stream
        while ($this->pos < $offset && !$this->eof()) {
            $result = $this->read(min(8096, $offset - $this->pos));
            if ($result === '') {
                break;
            }
        }
    }

/**
     * Reads from all of the appended streams until the length is met or EOF.
     *
     * {@inheritdoc}
     */
    public function read($length)
    {
        $buffer = '';
        $total = count($this->streams) - 1;
        $remaining = $length;
        $progressToNext = false;

while ($remaining > 0) {

// Progress to the next stream if needed.
            if ($progressToNext || $this->streams[$this->current]->eof()) {
                $progressToNext = false;
                if ($this->current === $total) {
                    break;
                }
                $this->current++;
            }

$result = $this->streams[$this->current]->read($remaining);

// Using a loose comparison here to match on '', false, and null
            if ($result == null) {
                $progressToNext = true;
                continue;
            }

$buffer .= $result;
            $remaining = $length - strlen($buffer);
        }

$this->pos += strlen($buffer);

return $buffer;
    }

public function isReadable()
    {
        return true;
    }

public function isWritable()
    {
        return false;
    }

public function isSeekable()
    {
        return $this->seekable;
    }

public function write($string)
    {
        throw new \RuntimeException('Cannot write to an AppendStream');
    }

public function getMetadata($key = null)
    {
        return $key ? null : [];
    }
}

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