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<?php |
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namespace Qiniu; |
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use Qiniu\Config; |
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final class Etag |
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{ |
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private static function packArray($v, $a) |
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{ |
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return call_user_func_array('pack', array_merge(array($v), (array)$a)); |
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} |
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private static function blockCount($fsize) |
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{ |
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return intval(($fsize + (Config::BLOCK_SIZE - 1)) / Config::BLOCK_SIZE); |
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} |
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private static function calcSha1($data) |
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{ |
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$sha1Str = sha1($data, true); |
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$err = error_get_last(); |
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if ($err !== null) { |
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return array(null, $err); |
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} |
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$byteArray = unpack('C*', $sha1Str); |
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return array($byteArray, null); |
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} |
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public static function sum($filename) |
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{ |
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$fhandler = fopen($filename, 'r'); |
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$err = error_get_last(); |
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if ($err !== null) { |
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return array(null, $err); |
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} |
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$fstat = fstat($fhandler); |
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$fsize = $fstat['size']; |
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if ((int)$fsize === 0) { |
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fclose($fhandler); |
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return array('Fto5o-5ea0sNMlW_75VgGJCv2AcJ', null); |
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} |
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$blockCnt = self::blockCount($fsize); |
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$sha1Buf = array(); |
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if ($blockCnt <= 1) { |
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array_push($sha1Buf, 0x16); |
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$fdata = fread($fhandler, Config::BLOCK_SIZE); |
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if ($err !== null) { |
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fclose($fhandler); |
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return array(null, $err); |
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} |
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list($sha1Code,) = self::calcSha1($fdata); |
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$sha1Buf = array_merge($sha1Buf, $sha1Code); |
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} else { |
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array_push($sha1Buf, 0x96); |
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$sha1BlockBuf = array(); |
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for ($i = 0; $i < $blockCnt; $i++) { |
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$fdata = fread($fhandler, Config::BLOCK_SIZE); |
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list($sha1Code, $err) = self::calcSha1($fdata); |
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if ($err !== null) { |
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fclose($fhandler); |
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return array(null, $err); |
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} |
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$sha1BlockBuf = array_merge($sha1BlockBuf, $sha1Code); |
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} |
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$tmpData = self::packArray('C*', $sha1BlockBuf); |
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list($sha1Final,) = self::calcSha1($tmpData); |
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$sha1Buf = array_merge($sha1Buf, $sha1Final); |
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} |
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$etag = \Qiniu\base64_urlSafeEncode(self::packArray('C*', $sha1Buf)); |
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return array($etag, null); |
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} |
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} |
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qiniu /
php-sdk
