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-rw-r--r--media/mtransport/databuffer.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/media/mtransport/databuffer.h b/media/mtransport/databuffer.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Original author: ekr@rtfm.com
+
+#ifndef databuffer_h__
+#define databuffer_h__
+#include <algorithm>
+#include <mozilla/UniquePtr.h>
+#include <m_cpp_utils.h>
+#include <nsISupportsImpl.h>
+
+namespace mozilla {
+
+class DataBuffer {
+ public:
+ DataBuffer() : data_(nullptr), len_(0), capacity_(0) {}
+ DataBuffer(const uint8_t *data, size_t len) {
+ Assign(data, len, len);
+ }
+ DataBuffer(const uint8_t *data, size_t len, size_t capacity) {
+ Assign(data, len, capacity);
+ }
+
+ // to ensure extra space for expansion
+ void Assign(const uint8_t *data, size_t len, size_t capacity) {
+ MOZ_RELEASE_ASSERT(len <= capacity);
+ Allocate(capacity); // sets len_ = capacity
+ memcpy(static_cast<void *>(data_.get()),
+ static_cast<const void *>(data), len);
+ len_ = len;
+ }
+
+ void Allocate(size_t capacity) {
+ data_.reset(new uint8_t[capacity ? capacity : 1]); // Don't depend on new [0].
+ len_ = capacity_ = capacity;
+ }
+
+ void EnsureCapacity(size_t capacity) {
+ if (capacity_ < capacity) {
+ uint8_t *new_data = new uint8_t[ capacity ? capacity : 1];
+ memcpy(static_cast<void *>(new_data),
+ static_cast<const void *>(data_.get()), len_);
+ data_.reset(new_data); // after copying! Deletes old data
+ capacity_ = capacity;
+ }
+ }
+
+ // used when something writes to the buffer (having checked
+ // capacity() or used EnsureCapacity()) and increased the length.
+ void SetLength(size_t len) {
+ MOZ_RELEASE_ASSERT(len <= capacity_);
+ len_ = len;
+ }
+
+ const uint8_t *data() const { return data_.get(); }
+ uint8_t *data() { return data_.get(); }
+ size_t len() const { return len_; }
+ size_t capacity() const { return capacity_; }
+
+private:
+ UniquePtr<uint8_t[]> data_;
+ size_t len_;
+ size_t capacity_;
+
+ DISALLOW_COPY_ASSIGN(DataBuffer);
+};
+
+}
+
+#endif