/**
* Constructor
*
* @param io.streams.InputStream in
*/
public function __construct(InputStream $in)
{
// Read GZIP format header
// * ID1, ID2 (Identification, \x1F, \x8B)
// * CM (Compression Method, 8 = deflate)
// * FLG (Flags)
// * MTIME (Modification time, Un*x timestamp)
// * XFL (Extra flags)
// * OS (Operating system)
$header = unpack('a2id/Cmethod/Cflags/Vtime/Cextra/Cos', $in->read(10));
if (" ‹" != $header['id']) {
throw new IOException('Invalid format, expected \\037\\213, have ' . addcslashes($header['id'], "..ÿ"));
}
if (8 != $header['method']) {
throw new IOException('Unknown compression method #' . $header['method']);
}
// Now, convert stream to file handle and append inflating filter
$wri = 'zlib.bounded://' . $in->hashCode();
self::$wrapped[$wri] = $in;
$this->in = fopen($wri, 'r');
if (!stream_filter_append($this->in, 'zlib.inflate', STREAM_FILTER_READ)) {
throw new IOException('Could not append stream filter');
}
}
/**
* Open an input stream for reading and return URI
*
* @param io.streams.InputStream s
* @return string
*/
public static function readableUri(InputStream $s)
{
self::$streams[$s->hashCode()] = $s;
return 'iostrr://' . $s->hashCode();
}
