native_client_sdk/src/libraries/nacl_io/socket/fifo_packet.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef LIBRARIES_NACL_IO_FIFO_PACKET_H_
   6 #define LIBRARIES_NACL_IO_FIFO_PACKET_H_
   7
   8 #include <string.h>
   9
  10 #include <list>
  11 #include <vector>
  12
  13 #include "nacl_io/fifo_interface.h"
  14 #include "ppapi/c/pp_resource.h"
  15
  16 #include "sdk_util/macros.h"
  17
  18 namespace nacl_io {
  19
  20 class Packet;
  21
  22 // FIFOPacket
  23 //
  24 // A FIFOPackiet is linked list of packets.  Data is stored and returned
  25 // in packet size increments.  FIFOPacket signals EMPTY where there are
  26 // no packets, and FULL when the total bytes of all packets meets or
  27 // exceeds the max size hint.
  28 class FIFOPacket : public FIFOInterface {
  29  public:
  30   explicit FIFOPacket(size_t size);
  31   virtual ~FIFOPacket();
  32
  33   virtual bool IsEmpty();
  34   virtual bool IsFull();
  35   virtual bool Resize(size_t len);
  36
  37   size_t ReadAvailable();
  38   size_t WriteAvailable();
  39
  40   // Return a pointer to the top packet without releasing ownership.
  41   Packet* PeekPacket();
  42
  43   // Relinquish top packet, and remove it from the FIFO.
  44   Packet* ReadPacket();
  45
  46   // Take ownership of packet and place it in the FIFO.
  47   void WritePacket(Packet* packet);
  48
  49  private:
  50   std::list<Packet*> packets_;
  51   uint32_t max_bytes_;
  52   uint32_t cur_bytes_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(FIFOPacket);
  55 };
  56
  57 }  // namespace nacl_io
  58
  59 #endif  // LIBRARIES_NACL_IO_FIFO_PACKET_H_