Added CacheEntry implementation.

net/disk_cache/flash/cache_entry.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_DISK_CACHE_FLASH_LOG_ENTRY_H_
+#define NET_DISK_CACHE_FLASH_LOG_ENTRY_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/gtest_prod_util.h"
+#include "net/base/net_export.h"
+#include "net/disk_cache/flash/format.h"
+
+namespace net {
+class IOBuffer;
+};
+
+namespace disk_cache {
+
+class LogStructuredStore;
+
+class NET_EXPORT_PRIVATE CacheEntry {
+ public:
+  explicit CacheEntry(LogStructuredStore* store);
+  CacheEntry(LogStructuredStore* store, int32 id);
+  ~CacheEntry();
+
+  bool Init();
+  bool Close();
+
+  int32 id() const;
+  int32 GetDataSize(int index) const;
+
+  int ReadData(int index, int offset, net::IOBuffer* buf, int buf_len);
+  int WriteData(int index, int offset, net::IOBuffer* buf, int buf_len);
+
+ private:
+  struct Stream {
+    Stream();
+    int offset;
+    int size;
+    std::vector<char> write_buffer;
+  };
+
+  bool OnDisk() const;
+  bool InvalidStream(int stream_index) const;
+  int32 Size() const;
+  bool Save();
+
+  LogStructuredStore* store_;
+  int32 id_;
+  Stream streams_[kFlashCacheEntryNumStreams];
+  bool init_;
+  bool closed_;
+
+  DISALLOW_COPY_AND_ASSIGN(CacheEntry);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_FLASH_LOG_ENTRY_H_