net: Move data reading functionalities from UploadElement to UploadElementReader

net/base/upload_file_element_reader.h

Index: net/base/upload_file_element_reader.h
diff --git a/net/base/upload_file_element_reader.h b/net/base/upload_file_element_reader.h
new file mode 100644
index 0000000000000000000000000000000000000000..875314bd12135e3a3000b72538443c0afe01d32a
--- /dev/null
+++ b/net/base/upload_file_element_reader.h
@@ -0,0 +1,63 @@
+// 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_FILE_ELEMENT_READER_H_
+#define NET_BASE_UPLOAD_FILE_ELEMENT_READER_H_
+
+#include "base/compiler_specific.h"
+#include "base/file_path.h"
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/time.h"
+#include "net/base/upload_element_reader.h"
+
+namespace net {
+
+class FileStream;
+
+// An UploadElementReader implementation for file.
+class NET_EXPORT_PRIVATE UploadFileElementReader : public UploadElementReader {
+ public:
+  UploadFileElementReader(const FilePath& path,
+                          uint64 range_offset,
+                          uint64 range_length,
+                          const base::Time& expected_modification_time);
+  virtual ~UploadFileElementReader();
+
+  // 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;
+
+ private:
+  // Sets an value to override the result for GetContentLength().
+  // Used for tests.
+  struct NET_EXPORT ScopedOverridingContentLengthForTests {
+    ScopedOverridingContentLengthForTests(uint64 value);
+    ~ScopedOverridingContentLengthForTests();
+  };
+
+  FilePath path_;
+  uint64 range_offset_;
+  uint64 range_length_;
+  base::Time expected_modification_time_;
+  scoped_ptr<FileStream> file_stream_;
+  uint64 content_length_;
+  uint64 bytes_remaining_;
+
+  FRIEND_TEST_ALL_PREFIXES(UploadDataStreamTest, FileSmallerThanLength);
+  FRIEND_TEST_ALL_PREFIXES(HttpNetworkTransactionTest,
+                           UploadFileSmallerThanLength);
+  FRIEND_TEST_ALL_PREFIXES(HttpNetworkTransactionSpdy2Test,
+                           UploadFileSmallerThanLength);
+  FRIEND_TEST_ALL_PREFIXES(HttpNetworkTransactionSpdy3Test,
+                           UploadFileSmallerThanLength);
+
+  DISALLOW_COPY_AND_ASSIGN(UploadFileElementReader);
+};
+
+}  // namespace net
+
+#endif  // NET_BASE_UPLOAD_FILE_ELEMENT_READER_H_