media/mtransport/databuffer.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 // Original author: ekr@rtfm.com
   8
   9 #ifndef databuffer_h__
  10 #define databuffer_h__
  11 #include <algorithm>
  12 #include <mozilla/UniquePtr.h>
  13 #include <m_cpp_utils.h>
  14 #include <nsISupportsImpl.h>
  15
  16 namespace mozilla {
  17
  18 class DataBuffer {
  19  public:
  20   DataBuffer() : data_(nullptr), len_(0) {}
  21   DataBuffer(const uint8_t *data, size_t len) {
  22     Assign(data, len);
  23   }
  24
  25   void Assign(const uint8_t *data, size_t len) {
  26     Allocate(len);
  27     memcpy(static_cast<void *>(data_.get()),
  28            static_cast<const void *>(data), len);
  29   }
  30
  31   void Allocate(size_t len) {
  32     data_.reset(new uint8_t[len ? len : 1]);  // Don't depend on new [0].
  33     len_ = len;
  34   }
  35
  36   const uint8_t *data() const { return data_.get(); }
  37   uint8_t *data() { return data_.get(); }
  38   size_t len() const { return len_; }
  39   const bool empty() const { return len_ != 0; }
  40
  41 private:
  42   UniquePtr<uint8_t[]> data_;
  43   size_t len_;
  44
  45   DISALLOW_COPY_ASSIGN(DataBuffer);
  46 };
  47
  48 }
  49
  50 #endif