Adding ChunkDemuxer implementation.

media/filters/buffer_url_protocol.cc

Index: media/filters/buffer_url_protocol.cc
diff --git a/media/filters/buffer_url_protocol.cc b/media/filters/buffer_url_protocol.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d1970cdb63c493c8986e3769584999130f11da4c
--- /dev/null
+++ b/media/filters/buffer_url_protocol.cc
@@ -0,0 +1,55 @@
+// Copyright (c) 2011 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.
+
+#include "media/filters/buffer_url_protocol.h"
+
+namespace media {
+
+BufferUrlProtocol::BufferUrlProtocol(const uint8* buf, int size,
+                                     bool streaming)
+    : buf_(buf),
+      size_(size),
+      offset_(0),
+      streaming_(streaming) {
+}
+
+BufferUrlProtocol::~BufferUrlProtocol() {}
+
+int BufferUrlProtocol::Read(int size, uint8* data) {
+  int bytes_to_copy = size;
+  int bytes_left = size_ - offset_;
+
+  if (bytes_to_copy > bytes_left)
+    bytes_to_copy = bytes_left;
+
+  if (bytes_to_copy == 0)
+    return 0;
+
+  memcpy(data, buf_ + offset_, bytes_to_copy);
+  offset_ += bytes_to_copy;
+
+  return bytes_to_copy;
+}
+
+bool BufferUrlProtocol::GetPosition(int64* position_out) {
+  *position_out = offset_;
+  return true;
+}
+
+bool BufferUrlProtocol::SetPosition(int64 position) {
+  if (position < 0 || position >= size_)
+    return false;
+
+  offset_ = position;
+  return true;
+}
+
+bool BufferUrlProtocol::GetSize(int64* size_out) {
+  *size_out = size_;
+  return true;
+}
+
+bool BufferUrlProtocol::IsStreaming() { return streaming_; }
+
+}  // namespace media