public function saveAttachment(&$ThisFileInfoIndex, $filename, $offset, $length)
{
try {
if (!getid3_lib::intValueSupported($offset + $length)) {
throw new Exception('cannot extract attachment, it extends beyond the ' . round(PHP_INT_MAX / 1073741824) . 'GB limit');
}
// do not extract at all
if ($this->option_save_attachments === getID3::ATTACHMENTS_NONE) {
unset($ThisFileInfoIndex);
// do not set any
// extract to return array
} elseif ($this->option_save_attachments === getID3::ATTACHMENTS_INLINE) {
// get whole data in one pass, till it is anyway stored in memory
$ThisFileInfoIndex = file_get_contents($this->info['filenamepath'], false, null, $offset, $length);
if ($ThisFileInfoIndex === false || strlen($ThisFileInfoIndex) != $length) {
// verify
throw new Exception('failed to read attachment data');
}
// assume directory path is given
} else {
$dir = rtrim(str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $this->option_save_attachments), DIRECTORY_SEPARATOR);
// check supplied directory
if (!is_dir($dir) || !is_writable($dir)) {
throw new Exception('getID3::saveAttachment() -- supplied path (' . $dir . ') does not exist, or is not writable');
}
// set up destination path
$dest = $dir . DIRECTORY_SEPARATOR . $filename;
// optimize speed if read buffer size is configured to be large enough
// here stream_copy_to_stream() may also be used. need to do speed-compare tests
if ($length <= $this->fread_buffer_size()) {
$data = file_get_contents($this->info['filenamepath'], false, null, $offset, $length);
if ($data === false || strlen($data) != $length) {
// verify
throw new Exception('failed to read attachment data');
}
if (!file_put_contents($dest, $data)) {
throw new Exception('failed to create file ' . $dest);
}
} else {
// optimization not available - copy data in loop
// here stream_copy_to_stream() shouldn't be used because it's internal read buffer may be larger than ours!
getid3_lib::CopyFileParts($this->info['filenamepath'], $dest, $offset, $length);
}
$ThisFileInfoIndex = $dest;
}
} catch (Exception $e) {
unset($ThisFileInfoIndex);
// do not set any is case of error
$this->warning('Failed to extract attachment ' . $filename . ': ' . $e->getMessage());
return false;
}
return true;
}
static function hash_data($file, $offset, $end, $algorithm)
{
static $tempdir = '';
if (!getid3_lib::intValueSupported($end)) {
return false;
}
switch ($algorithm) {
case 'md5':
$hash_function = 'md5_file';
$unix_call = 'md5sum';
$windows_call = 'md5sum.exe';
$hash_length = 32;
break;
case 'sha1':
$hash_function = 'sha1_file';
$unix_call = 'sha1sum';
$windows_call = 'sha1sum.exe';
$hash_length = 40;
break;
default:
throw new Exception('Invalid algorithm (' . $algorithm . ') in getid3_lib::hash_data()');
break;
}
$size = $end - $offset;
while (true) {
if (GETID3_OS_ISWINDOWS) {
// It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
// Fall back to create-temp-file method:
if ($algorithm == 'sha1') {
break;
}
$RequiredFiles = array('cygwin1.dll', 'head.exe', 'tail.exe', $windows_call);
foreach ($RequiredFiles as $required_file) {
if (!is_readable(GETID3_HELPERAPPSDIR . $required_file)) {
// helper apps not available - fall back to old method
break;
}
}
$commandline = GETID3_HELPERAPPSDIR . 'head.exe -c ' . $end . ' "' . escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $file)) . '" | ';
$commandline .= GETID3_HELPERAPPSDIR . 'tail.exe -c ' . $size . ' | ';
$commandline .= GETID3_HELPERAPPSDIR . $windows_call;
} else {
$commandline = 'head -c' . $end . ' ' . escapeshellarg($file) . ' | ';
$commandline .= 'tail -c' . $size . ' | ';
$commandline .= $unix_call;
}
if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
//throw new Exception('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm');
break;
}
return substr(`{$commandline}`, 0, $hash_length);
}
if (empty($tempdir)) {
// yes this is ugly, feel free to suggest a better way
require_once dirname(__FILE__) . '/getid3.php';
$getid3_temp = new getID3();
$tempdir = $getid3_temp->tempdir;
unset($getid3_temp);
}
// try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
if (($data_filename = tempnam($tempdir, 'gI3')) === false) {
// can't find anywhere to create a temp file, just fail
return false;
}
// Init
$result = false;
// copy parts of file
try {
getid3_lib::CopyFileParts($file, $data_filename, $offset, $end - $offset);
$result = $hash_function($data_filename);
} catch (Exception $e) {
throw new Exception('getid3_lib::CopyFileParts() failed in getid_lib::hash_data(): ' . $e->getMessage());
}
unlink($data_filename);
return $result;
}
