/**
* Constructor
*
* @param io.streams.InputStream $in
* @throws io.IOException
*/
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)
$this->header = unpack('a2id/Cmethod/Cflags/Vtime/Cextra/Cos', $in->read(10));
if (" ‹" != $this->header['id']) {
throw new IOException('Invalid format, expected \\037\\213, have ' . addcslashes($this->header['id'], "..ÿ"));
}
if (8 !== $this->header['method']) {
throw new IOException('Unknown compression method #' . $this->header['method']);
}
if (8 === ($this->header['flags'] & 8)) {
$this->header['filename'] = '';
while ("" !== ($b = $in->read(1))) {
$this->header['filename'] .= $b;
}
}
// 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');
}
}
/**
* Read a line
*
* @param io.streams.InputStream in
* @return string
* @throws lang.FormatException if no line can be read
*/
protected function readLine(InputStream $in)
{
$line = '';
while ("\n" !== ($chr = $in->read(1))) {
$line .= $chr;
if (!$in->available()) {
break;
}
}
return $line;
}
/**
* Read an IOElements' contents completely into a buffer in a single call.
*
* @param io.streams.InputStream s
* @return string
* @throws io.IOException
*/
public static function readAll(InputStream $s)
{
$r = '';
while ($s->available() > 0) {
$r .= $s->read();
}
return $r;
}
