stat($filePath)['size'];
if (isset($_GET['stream'])) {
session_write_close();
while (ob_get_level()) {
ob_end_clean();
}
if (ini_get('zlib.output_compression')) {
ini_set('zlib.output_compression', 'Off');
}
$start = 0;
$end = $fileSize - 1;
$length = $fileSize;
if (isset($_SERVER['HTTP_RANGE'])) {
$rangeHeader = $_SERVER['HTTP_RANGE'];
$matches = [];
if (preg_match('/bytes=(\d+)-(\d*)/', $rangeHeader, $matches)) {
$start = intval($matches[1]);
if (!empty($matches[2])) {
$end = intval($matches[2]);
}
$length = $end - $start + 1;
header('HTTP/1.1 206 Partial Content');
header('Content-Range: bytes ' . $start . '-' . $end . '/' . $fileSize);
}
}
header('Content-Type: application/pdf');
header('Content-Disposition: inline; filename="' . basename($filePath) . '"');
header("Accept-Ranges: bytes");
header("Content-Length: $length");
header("Cache-Control: no-cache, no-store, must-revalidate");
header("Pragma: no-cache");
header("Expires: 0");
set_time_limit(0);
$minChunkSize = 64 * 1024; // 64KB minimum
$maxChunkSize = 2 * 1024 * 1024; // 2MB maximum
$chunkSize = 256 * 1024; // Start with 256KB
$currentPosition = $start;
$bytesRemaining = $length;
$lastChunkTime = microtime(true);
try {
while ($bytesRemaining > 0) {
if (connection_aborted()) {
break;
}
$readSize = min($chunkSize, $bytesRemaining);
$chunkData = $sftp->get($filePath, false, $currentPosition, $readSize);
if ($chunkData !== false) {
$bytesSent = strlen($chunkData);
echo $chunkData;
$bytesRemaining -= $bytesSent;
$currentPosition += $bytesSent;
if (ob_get_level()) {
ob_flush();
}
flush();
$currentTime = microtime(true);
$timeDiff = $currentTime - $lastChunkTime;
$lastChunkTime = $currentTime;
if ($timeDiff > 0) {
$speed = $bytesSent / $timeDiff;
$chunkSize = min(
max($minChunkSize, $chunkSize * (($speed > 512 * 1024) ? 1.5 : 0.8)),
$maxChunkSize
);
}
} else {
break;
}
}
} catch (Exception $e) {
error_log("Streaming error: " . $e->getMessage());
}
exit;
}
?>
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