1 files changed, 61 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/memory_stream.h b/third_party/libwebrtc/rtc_base/memory_stream.h
new file mode 100644
index 0000000000..7deb4b3006
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/memory_stream.h
@@ -0,0 +1,61 @@
+/*
+ *  Copyright 2018 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef RTC_BASE_MEMORY_STREAM_H_
+#define RTC_BASE_MEMORY_STREAM_H_
+
+#include <stddef.h>
+
+#include "rtc_base/stream.h"
+
+namespace rtc {
+
+// MemoryStream dynamically resizes to accomodate written data.
+
+class MemoryStream final : public StreamInterface {
+ public:
+  MemoryStream();
+  ~MemoryStream() override;
+
+  StreamState GetState() const override;
+  StreamResult Read(void* buffer,
+                    size_t bytes,
+                    size_t* bytes_read,
+                    int* error) override;
+  StreamResult Write(const void* buffer,
+                     size_t bytes,
+                     size_t* bytes_written,
+                     int* error) override;
+  void Close() override;
+  bool GetSize(size_t* size) const;
+  bool ReserveSize(size_t size);
+
+  bool SetPosition(size_t position);
+  bool GetPosition(size_t* position) const;
+  void Rewind();
+
+  char* GetBuffer() { return buffer_; }
+  const char* GetBuffer() const { return buffer_; }
+
+  void SetData(const void* data, size_t length);
+
+ private:
+  StreamResult DoReserve(size_t size, int* error);
+
+  // Invariant: 0 <= seek_position <= data_length_ <= buffer_length_
+  char* buffer_ = nullptr;
+  size_t buffer_length_ = 0;
+  size_t data_length_ = 0;
+  size_t seek_position_ = 0;
+};
+
+}  // namespace rtc
+
+#endif  // RTC_BASE_MEMORY_STREAM_H_