Http Cache: Add support for resuming downloading a...

net/http/http_cache.h

 // Copyright (c) 2006-2008 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.
 
 // This file declares a HttpTransactionFactory implementation that can be
 // layered on top of another HttpTransactionFactory to add HTTP caching.  The
 // caching logic follows RFC 2616 (any exceptions are called out in the code).
 //
 // The HttpCache takes a disk_cache::Backend as a parameter, and uses that for
 // the cache storage.
@@ skipping 79 matching lines @@
             disk_cache::Backend* disk_cache);
 
   HttpTransactionFactory* network_layer() { return network_layer_.get(); }
   disk_cache::Backend* disk_cache() { return disk_cache_.get(); }
 
   // HttpTransactionFactory implementation:
   virtual HttpTransaction* CreateTransaction();
   virtual HttpCache* GetCache();
   virtual void Suspend(bool suspend);
 
-  // Helper function for reading response info from the disk cache.
+  // Helper function for reading response info from the disk cache.  If the
+  // cache doesn't have the whole resource *|request_truncated| is set to true.
   static bool ReadResponseInfo(disk_cache::Entry* disk_entry,
-                               HttpResponseInfo* response_info);
+                               HttpResponseInfo* response_info,
+                               bool* response_truncated);
 
-  // Helper function for writing response info into the disk cache.
+  // Helper function for writing response info into the disk cache.  If the
+  // cache doesn't have the whole resource |request_truncated| should be true.
   static bool WriteResponseInfo(disk_cache::Entry* disk_entry,
                                 const HttpResponseInfo* response_info,
-                                bool skip_transient_headers);
+                                bool skip_transient_headers,
+                                bool response_truncated);
 
   // Given a header data blob, convert it to a response info object.
   static bool ParseResponseInfo(const char* data, int len,
-                                HttpResponseInfo* response_info);
+                                HttpResponseInfo* response_info,
+                                bool* response_truncated);
 
   // Get/Set the cache's mode.
   void set_mode(Mode value) { mode_ = value; }
   Mode mode() { return mode_; }
 
   void set_type(CacheType type) { type_ = type; }
   CacheType type() { return type_; }
 
   // Close All Idle Sockets.  This is for debugging.
   void CloseIdleConnections();
@@ skipping 33 matching lines @@
   void DoomEntry(const std::string& key);
   void FinalizeDoomedEntry(ActiveEntry* entry);
   ActiveEntry* FindActiveEntry(const std::string& key);
   ActiveEntry* ActivateEntry(const std::string& key, disk_cache::Entry*);
   void DeactivateEntry(ActiveEntry* entry);
   void SlowDeactivateEntry(ActiveEntry* entry);
   ActiveEntry* OpenEntry(const std::string& key);
   ActiveEntry* CreateEntry(const std::string& cache_key);
   void DestroyEntry(ActiveEntry* entry);
   int AddTransactionToEntry(ActiveEntry* entry, Transaction* trans);
-  void DoneWithEntry(ActiveEntry* entry, Transaction* trans);
+  void DoneWithEntry(ActiveEntry* entry, Transaction* trans, bool cancel);
   void DoneWritingToEntry(ActiveEntry* entry, bool success);
   void DoneReadingFromEntry(ActiveEntry* entry, Transaction* trans);
   void ConvertWriterToReader(ActiveEntry* entry);
   void RemovePendingTransaction(Transaction* trans);
   void ProcessPendingQueue(ActiveEntry* entry);
 
 
   // Events (called via PostTask) ---------------------------------------------
 
   void OnProcessPendingQueue(ActiveEntry* entry);
@@ skipping 26 matching lines @@
   scoped_ptr<PlaybackCacheMap> playback_cache_map_;
 
   RevocableStore transactions_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpCache);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_CACHE_H_