private function ReadQueueHeader($bLockHeld = false)
{
if ($bLockHeld == false) {
$err = $this->ReadLock();
if ($err != EOK) {
return $err;
}
}
//
// Load the header bytes.
//
$headerJson = shmop_read($this->shmHandle, 0, LsShmQueue::HEADER_SIZE);
if ($headerJson === false) {
if ($bLockHeld == false) {
$this->Unlock();
}
return EIO;
}
//
// Trim any trailing whitespace since we're reading in a larger block
// than the structure actually takes up.
//
$headerJson = rtrim($headerJson);
//
// The first 8 characters are the generation counter.
//
$generation = substr($headerJson, LsShmQueue::GENERATION_OFFSET, LsShmQueue::GENERATION_SIZE);
$this->generation = hexdec($generation);
//
// Pull out the record portion of the storage.
//
$headerJson = substr($headerJson, LsShmQueue::HEADER_OFFSET);
//
// Decode the json structure.
//
$headerArray = json_decode($headerJson, true);
if ($headerArray === null) {
//
// This structure isn't valid in shared memory, return ENOENT.
//
if ($bLockHeld == false) {
$this->Unlock();
}
return ENOENT;
}
//
// Make sure all the fields exist.
//
if (!isset($headerArray['version']) || !isset($headerArray['inPtr']) || !isset($headerArray['outPtr']) || !isset($headerArray['queueDepth']) || !isset($headerArray['shmSize']) || !isset($headerArray['qeSize']) || !isset($headerArray['lockFilename']) || !isset($headerArray['bIsLocking']) || !isset($headerArray['msgMemSize']) || !isset($headerArray['msgMemInPtr']) || !isset($headerArray['msgMemOutPtr']) || !isset($headerArray['crc32'])) {
if ($bLockHeld == false) {
$this->Unlock();
}
return ENOENT;
}
//
// Compute crc and validate.
//
$crcInMemory = $headerArray['crc32'];
$headerArray['crc32'] = LsShmQueue::BLANK_CRC;
$json = LsJson::CreateList($headerArray);
$crcComputed = sprintf("%08X", crc32($json));
if ($crcInMemory !== $crcComputed) {
if ($bLockHeld == false) {
$this->Unlock();
}
return EBADCRC;
}
//
// Load the values into the object.
//
$this->version = $headerArray['version'];
$this->inPtr = $headerArray['inPtr'];
$this->outPtr = $headerArray['outPtr'];
$this->queueDepth = $headerArray['queueDepth'];
$this->shmSize = $headerArray['shmSize'];
$this->qeSize = $headerArray['qeSize'];
$this->lockFilename = $headerArray['lockFilename'];
$this->bIsLocking = $headerArray['bIsLocking'];
$this->msgMemSize = $headerArray['msgMemSize'];
$this->msgMemInPtr = $headerArray['msgMemInPtr'];
$this->msgMemOutPtr = $headerArray['msgMemOutPtr'];
if ($bLockHeld == false) {
$this->Unlock();
}
return EOK;
}
public static function CreateList_backup(&$array, $bObjBrackets = true, $bPrettyOutput = false)
{
$json = "";
$bRemoveComma = false;
if ($bObjBrackets === true) {
$json .= LsJson::OpenObject($bPrettyOutput);
}
//
// Create the var/value pairs
//
foreach ($array as $key => $value) {
if (is_array($array[$key]) === true) {
$value = LsJson::CreateList($array[$key], $bObjBrackets, $bPrettyOutput);
} else {
if (is_object($array[$key]) === true) {
//
// Check to see if the ToJson() method exists.
//
if (method_exists($array[$key], 'ToJson') === true) {
$value = $array[$key]->ToJson();
}
}
}
$json .= LsJson::VarValue($key, $value, $bPrettyOutput) . ",";
$bRemoveComma = true;
}
if ($bRemoveComma === true) {
$json = substr($json, 0, -1);
}
if ($bObjBrackets === true) {
$json .= LsJson::CloseObject($bPrettyOutput);
}
return $json;
}
