@Throws(IOException::class)
  fun initialize() {
    this.assertThreadHoldsLock()

    if (initialized) {
      return // Already initialized.
    }

    // If a bkp file exists, use it instead.
    if (fileSystem.exists(journalFileBackup)) {
      // If journal file also exists just delete backup file.
      if (fileSystem.exists(journalFile)) {
        fileSystem.delete(journalFileBackup)
      } else {

    frameLength = (b1 and B1_MASK_LENGTH).toLong()
    if (frameLength == PAYLOAD_SHORT.toLong()) {
      frameLength = (source.readShort() and 0xffff).toLong() // Value is unsigned.
    } else if (frameLength == PAYLOAD_LONG.toLong()) {
      frameLength = source.readLong()
      if (frameLength < 0L) {
        throw ProtocolException(

        if (errorCode != null) {
          return false
        }
        if ((source.finished || source.closed) &&
          (sink.finished || sink.closed) &&
          hasResponseHeaders
        ) {
          return false
        }
        return true
      }
    }

  /** Returns true if this stream was created by this peer. */
  val isLocallyInitiated: Boolean
    get() {

        // If the connection is in use, keep searching.
        if (pruneAndGetAllocationCount(connection, now) > 0) {
          inUseConnectionCount++
          return@withLock
        }

        val idleAtNs = connection.idleAtNs

        if (idleAtNs < earliestOldIdleAtNs) {
          earliestOldIdleAtNs = idleAtNs
          earliestOldConnection = connection
        }

        // Handle callable declarations with explicit return type first
        if (declaration is KtCallableDeclaration) {
            val typeReference = declaration.typeReference

            if (typeReference != null) {
                val bindingContext = analysisContext.analyze(typeReference, AnalysisMode.PARTIAL)
                val kotlinType =
                    if (declaration is KtParameter && declaration.isVarArg) {

 * for conditional GETs) or warnings to the cached response (if the cached data is potentially
 * stale).
 */
class CacheStrategy internal constructor(
  /** The request to send on the network, or null if this call doesn't use the network. */
  val networkRequest: Request?,
  /** The cached response to return or validate; or null if this call doesn't use a cache. */

      if (response.socketPolicy === DisconnectAfterRequest) {
        socket.close()
        return false
      }
      if (response.socketPolicy === HalfCloseAfterRequest) {
        socket.shutdownOutput()
        return false
      }
      if (response.socketPolicy === NoResponse) {
        // This read should block until the socket is closed. (Because nobody is writing.)
        if (source.exhausted()) return false

    ): KtSymbol? {
        val classLikeDeclaration = this.toSymbol(session)?.fir
        if (classLikeDeclaration is FirRegularClass) {
            if (calleeReference is FirResolvedNamedReference) {
                val callee = calleeReference.resolvedSymbol.fir as? FirCallableDeclaration
                // TODO: check callee owner directly?
                if (callee !is FirConstructor && callee?.isStatic != true) {

        if (platformSystemProperty == JDK9_PROPERTY) {
          if (System.getProperty("javax.net.debug") == null) {
            System.setProperty("javax.net.debug", "")
          }
        } else if (platformSystemProperty == CONSCRYPT_PROPERTY) {
          if (Security.getProviders()[0].name != "Conscrypt") {
            if (!Conscrypt.isAvailable()) {

   */
  fun peekHeader(): DerHeader? {
    var result = peekedHeader

    if (result == null) {
      result = readHeader()
      peekedHeader = result
    }

    if (result.isEndOfData) return null

    return result
  }

  /**
   * Consume the next header in the stream and return it. If there is no header to read because we
   * have reached a limit, this returns [END_OF_DATA].
   */