Add net to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 105 insertions, 0 deletions

diff --git a/net/disk_cache/block_files.h b/net/disk_cache/block_files.h
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+++ b/net/disk_cache/block_files.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// 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 "net/disk_cache/addr.h"
+#include "net/disk_cache/mapped_file.h"
+
+namespace disk_cache {
+
+class EntryImpl;
+
+// This class handles the set of block-files open by the disk cache.
+class BlockFiles {
+ public:
+  explicit BlockFiles(const std::wstring& path)
+      : path_(path), init_(false), zero_buffer_(NULL) {}
+  ~BlockFiles();
+
+  // Performs the object initialization. create_files indicates if the backing
+  // files should be created or just open.
+  bool Init(bool create_files);
+
+  // Returns the file that stores a given address.
+  MappedFile* GetFile(Addr address);
+
+  // Creates a new entry on a block file. block_type indicates the size of block
+  // to be used (as defined on cache_addr.h), block_count is the number of
+  // blocks to allocate, and block_address is the address of the new entry.
+  bool CreateBlock(FileType block_type, int block_count, Addr* block_address);
+
+  // Removes an entry from the block files. If deep is true, the storage is zero
+  // filled; otherwise the entry is removed but the data is not altered (must be
+  // already zeroed).
+  void DeleteBlock(Addr address, bool deep);
+
+  // Close all the files and set the internal state to be initializad again. The
+  // cache is being purged.
+  void CloseFiles();
+
+ 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(const MappedFile* file);
+
+  // Creates an empty block file and returns its index.
+  int CreateNextBlockFile(FileType block_type);
+
+  // Restores the header of a potentially inconsistent file.
+  bool FixBlockFileHeader(MappedFile* file);
+
+  // Returns the filename for a given file index.
+  std::wstring Name(int index);
+
+  bool init_;
+  char* zero_buffer_;  // Buffer to speed-up cleaning deleted entries.
+  std::wstring path_;  // Path to the backing folder.
+  std::vector<MappedFile*> block_files_;  // The actual files.
+
+  DISALLOW_EVIL_CONSTRUCTORS(BlockFiles);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_BLOCK_FILES_H__