[NaCl SDK] Support non blocking TCP/UDP

native_client_sdk/src/libraries/nacl_io/fifo_packet.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef LIBRARIES_NACL_IO_FIFO_PACKET_H_
+#define LIBRARIES_NACL_IO_FIFO_PACKET_H_
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <list>
+
+#include "nacl_io/fifo_interface.h"
+#include "ppapi/c/pp_resource.h"
+
+namespace nacl_io {
+
+struct Packet {
+  Packet(const char *buffer, int32_t len, PP_Resource addr)
+      : len_(len),
+        addr_(addr) {
+    buffer_ = new char[len];
+    memcpy(buffer_, buffer, len);
+  }
+
+  ~Packet() {
+    delete[] buffer_;
+  }
+
+  char* buffer_;
+  int32_t len_;
+  PP_Resource addr_;
+};
+
+class  FIFOPacket {
+ public:
+  explicit FIFOPacket(size_t size);
+  ~FIFOPacket();
+
+  virtual bool IsEmpty();
+  virtual bool IsFull();
+  virtual bool Resize(size_t len);
+
+  // Reads out no more than the requested len without updating the tail.
+  // Returns actual amount read.
+  Packet* PeekPacket();
+
+  // Reads out the data making room in the FIFO.  Returns actual amount
+  // read.
+  Packet* ReadPacket();
+
+  // Writes into the FIFO no more than len bytes, returns actual amount
+  // written.
+  uint32_t WritePacket(Packet* packet);
+
+
+private:
+  std::list<UDPPacket*> packets_;
+  uint32_t max_bytes_;
+  uint32_t cur_bytes_;
+};
+
+}  // namespace nacl_io
+
+#endif  // LIBRARIES_NACL_IO_FIFO_PACKET_H_