header('Content-type:text/html;Charset=UTF-8'); define('blockSize', 4*1024*1024); var_dump(fileHash('test.wmv'));
var_dump(fileHash('asdf.wmv')); function fileHash($file)
{
$f = fopen($file, "r");
if (!$f) exit("open $file error"); $fileSize = filesize($file);
$buffer = '';
$sha = '';
// 一共有多少分片
$blkcnt = $fileSize/blockSize;
if ($fileSize % blockSize) $blkcnt += 1;
// 把数据装入一个二进制字符串
$buffer .= pack("L", $blkcnt);
if ($fileSize <= blockSize) {
$content = fread($f, blockSize);
if (!$content) {
fclose($f);
exit("read file error");
}
$sha .= sha1($content, TRUE);
} else {
for($i=0; $i<$blkcnt; $i+=1) {
$content = fread($f, blockSize);
if (!$content) {
if (feof($f)) break;
fclose($f);
exit("read file error");
}
$sha .= sha1($content, TRUE);
}
$sha = sha1($sha, TRUE);
}
$buffer .= $sha;
$hash = urlSafeEncode(base64_encode($buffer));
fclose($f);
return array($hash, null);
} function urlSafeEncode($data)
{
$find = array('+', '/');
$replace = array('-', '_');
return str_replace($find, $replace, $data);
}