net: Move data reading functionalities from UploadElement to UploadElementReader

net/base/upload_bytes_element_reader.h

+// Copyright (c) 2012 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 NET_BASE_UPLOAD_BYTES_ELEMENT_READER_H_
+#define NET_BASE_UPLOAD_BYTES_ELEMENT_READER_H_
+
+#include "base/compiler_specific.h"
+#include "net/base/upload_element_reader.h"
+
+namespace net {
+
+// An UploadElementReader implementation for bytes.
+class NET_EXPORT_PRIVATE UploadBytesElementReader : public UploadElementReader {
+ public:
+  UploadBytesElementReader(const char* bytes, int bytes_length);
+  virtual ~UploadBytesElementReader();
+
+  // UploadElementReader overrides:
+  virtual int InitSync() OVERRIDE;
+  virtual uint64 GetContentLength() const OVERRIDE;
+  virtual uint64 BytesRemaining() const OVERRIDE;
+  virtual int ReadSync(char* buf, int buf_length) OVERRIDE;
+  virtual bool IsInMemory() const OVERRIDE;
+
+ private:
+  const char* bytes_;
+  int bytes_length_;
+  int offset_;
+
+  DISALLOW_COPY_AND_ASSIGN(UploadBytesElementReader);
+};
+
+}  // namespace net
+
+#endif  // NET_BASE_UPLOAD_BYTES_ELEMENT_READER_H_