| 1 |
<?php |
| 2 |
|
| 3 |
namespace Depicter\GuzzleHttp\Psr7; |
| 4 |
|
| 5 |
use Depicter\Psr\Http\Message\StreamInterface; |
| 6 |
|
| 7 |
/** |
| 8 |
* Uses PHP's zlib.inflate filter to inflate deflate or gzipped content. |
| 9 |
* |
| 10 |
* This stream decorator skips the first 10 bytes of the given stream to remove |
| 11 |
* the gzip header, converts the provided stream to a PHP stream resource, |
| 12 |
* then appends the zlib.inflate filter. The stream is then converted back |
| 13 |
* to a Guzzle stream resource to be used as a Guzzle stream. |
| 14 |
* |
| 15 |
* @link http://tools.ietf.org/html/rfc1952 |
| 16 |
* @link http://php.net/manual/en/filters.compression.php |
| 17 |
* |
| 18 |
* @final |
| 19 |
*/ |
| 20 |
class InflateStream implements StreamInterface |
| 21 |
{ |
| 22 |
use StreamDecoratorTrait; |
| 23 |
|
| 24 |
public function __construct(StreamInterface $stream) |
| 25 |
{ |
| 26 |
// read the first 10 bytes, ie. gzip header |
| 27 |
$header = $stream->read(10); |
| 28 |
$filenameHeaderLength = $this->getLengthOfPossibleFilenameHeader($stream, $header); |
| 29 |
// Skip the header, that is 10 + length of filename + 1 (nil) bytes |
| 30 |
$stream = new LimitStream($stream, -1, 10 + $filenameHeaderLength); |
| 31 |
$resource = StreamWrapper::getResource($stream); |
| 32 |
stream_filter_append($resource, 'zlib.inflate', STREAM_FILTER_READ); |
| 33 |
$this->stream = $stream->isSeekable() ? new Stream($resource) : new NoSeekStream(new Stream($resource)); |
| 34 |
} |
| 35 |
|
| 36 |
/** |
| 37 |
* @param StreamInterface $stream |
| 38 |
* @param $header |
| 39 |
* |
| 40 |
* @return int |
| 41 |
*/ |
| 42 |
private function getLengthOfPossibleFilenameHeader(StreamInterface $stream, $header) |
| 43 |
{ |
| 44 |
$filename_header_length = 0; |
| 45 |
|
| 46 |
if (substr(bin2hex($header), 6, 2) === '08') { |
| 47 |
// we have a filename, read until nil |
| 48 |
$filename_header_length = 1; |
| 49 |
while ($stream->read(1) !== chr(0)) { |
| 50 |
$filename_header_length++; |
| 51 |
} |
| 52 |
} |
| 53 |
|
| 54 |
return $filename_header_length; |
| 55 |
} |
| 56 |
} |
| 57 |
|
