1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // See net/disk_cache/disk_cache.h for the public interface of the cache. 6 7 #ifndef NET_DISK_CACHE_FILE_BLOCK_H__ 8 #define NET_DISK_CACHE_FILE_BLOCK_H__ 9 #pragma once 10 11 namespace disk_cache { 12 13 // This interface exposes common functionality for a single block of data 14 // stored on a file-block, regardless of the real type or size of the block. 15 // Used to simplify loading / storing the block from disk. 16 class FileBlock { 17 public: ~FileBlock()18 virtual ~FileBlock() {} 19 20 // Returns a pointer to the actual data. 21 virtual void* buffer() const = 0; 22 23 // Returns the size of the block; 24 virtual size_t size() const = 0; 25 26 // Returns the file offset of this block. 27 virtual int offset() const = 0; 28 }; 29 30 } // namespace disk_cache 31 32 #endif // NET_DISK_CACHE_FILE_BLOCK_H__ 33