/**
* Determines whether a file is text or binary by checking the first few bytes in the file.
* The exact number of bytes is system dependent, but it is typically several thousand.
* If every byte in that part of the file is non-null, considers the file to be text;
* otherwise it considers the file to be binary.
*
* @param string $file
* @return boolean
*/
public static function isBinary($file)
{
// open file
$file = new File($file, 'rb');
// get block size
$stat = $file->stat();
$blockSize = $stat['blksize'];
if ($blockSize < 0) {
$blockSize = 1024;
}
if ($blockSize > $file->filesize()) {
$blockSize = $file->filesize();
}
if ($blockSize <= 0) {
return false;
}
// get bytes
$block = $file->read($blockSize);
return strlen($block) == 0 || preg_match_all('/\\x00/', $block, $match) > 0;
}
public static function open($path, $flags, $cb, $mode = null, $pri = EIO_PRI_DEFAULT)
{
if (self::$supported) {
$fdCacheKey = $path . "" . $flags;
$noncache = strpos($flags, '!') !== false;
$flags = File::convertFlags($flags);
if (!$noncache && ($item = FS::$fdCache->get($fdCacheKey))) {
// cache hit
$file = $item->getValue();
if ($file === null) {
// operation in progress
$item->addListener($cb);
} else {
// hit
call_user_func($cb, $file);
}
return;
} elseif (!$noncache) {
$item = FS::$fdCache->put($fdCacheKey, null);
$item->addListener($cb);
}
return eio_open($path, $flags, $mode, $pri, function ($arg, $fd) use($cb, $path, $flags, $fdCacheKey, $noncache) {
if (!$fd) {
if ($noncache) {
call_user_func($cb, false);
} else {
FS::$fdCache->put($fdCacheKey, false, self::$badFDttl);
}
return;
}
$file = new File($fd);
$file->append = ($flags | EIO_O_APPEND) === $flags;
$file->path = $path;
if ($file->append) {
$file->stat(function ($file, $stat) use($cb, $noncache, $fdCacheKey) {
$file->pos = $stat['size'];
if (!$noncache) {
$file->fdCacheKey = $fdCacheKey;
FS::$fdCache->put($fdCacheKey, $file);
} else {
call_user_func($cb, $file);
}
});
} else {
if (!$noncache) {
$file->fdCacheKey = $fdCacheKey;
FS::$fdCache->put($fdCacheKey, $file);
} else {
call_user_func($cb, $file);
}
}
}, $path);
}
$mode = File::convertFlags($flags, true);
$fd = fopen($path, $mode);
if (!$fd) {
call_user_func($cb, false);
return;
}
$file = new File($fd);
$file->path = $path;
call_user_func($cb, $file);
}
