Disk cache: Add base files for implementation of file format version 3.

net/disk_cache/v3/block_bitmaps.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.
 
 // See net/disk_cache/disk_cache.h for the public interface.
 
 #ifndef NET_DISK_CACHE_BLOCK_FILES_H_
 #define NET_DISK_CACHE_BLOCK_FILES_H_
 
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/net_export.h"
 #include "net/disk_cache/addr.h"
 #include "net/disk_cache/mapped_file.h"
 
-namespace base {
-class ThreadChecker;
-}
-
 namespace disk_cache {
 
 // This class handles the set of block-files open by the disk cache.
 class NET_EXPORT_PRIVATE BlockFiles {
  public:
   explicit BlockFiles(const base::FilePath& path);
   ~BlockFiles();
 
   // Performs the object initialization. create_files indicates if the backing
   // files should be created or just open.
@@ skipping 17 matching lines @@
   void CloseFiles();
 
   // Sends UMA stats.
   void ReportStats();
 
   // Returns true if the blocks pointed by a given address are currently used.
   // This method is only intended for debugging.
   bool IsValid(Addr address);
 
  private:
-  // Set force to true to overwrite the file if it exists.
-  bool CreateBlockFile(int index, FileType file_type, bool force);
-  bool OpenBlockFile(int index);
-
   // Attemp to grow this file. Fails if the file cannot be extended anymore.
   bool GrowBlockFile(MappedFile* file, BlockFileHeader* header);
 
   // Returns the appropriate file to use for a new block.
   MappedFile* FileForNewBlock(FileType block_type, int block_count);
 
-  // Returns the next block file on this chain, creating new files if needed.
-  MappedFile* NextFile(MappedFile* file);
-
-  // Creates an empty block file and returns its index.
-  int CreateNextBlockFile(FileType block_type);
-
-  // Removes a chained block file that is now empty.
-  bool RemoveEmptyFile(FileType block_type);
-
   // Restores the header of a potentially inconsistent file.
   bool FixBlockFileHeader(MappedFile* file);
 
   // Retrieves stats for the given file index.
   void GetFileStats(int index, int* used_count, int* load);
 
-  // Returns the filename for a given file index.
-  base::FilePath Name(int index);
-
   bool init_;
-  char* zero_buffer_;  // Buffer to speed-up cleaning deleted entries.
-  base::FilePath path_;  // Path to the backing folder.
-  std::vector<MappedFile*> block_files_;  // The actual files.
-  scoped_ptr<base::ThreadChecker> thread_checker_;
-
-  FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_ZeroSizeFile);
-  FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_TruncatedFile);
-  FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_InvalidFile);
-  FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_Stats);
 
   DISALLOW_COPY_AND_ASSIGN(BlockFiles);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BLOCK_FILES_H_