Disk cache: Add explicit support for eviction / deletion...

net/disk_cache/block_files.cc

 // 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.
 
 #include "net/disk_cache/block_files.h"
 
 #include "base/file_util.h"
 #include "base/histogram.h"
 #include "base/string_util.h"
 #include "base/time.h"
@@ skipping 243 matching lines @@
 
   if (header->updating) {
     // Last instance was not properly shutdown.
     if (!FixBlockFileHeader(file))
       return false;
   }
   return true;
 }
 
 MappedFile* BlockFiles::GetFile(Addr address) {
-  CHECK(block_files_.size() >= 4);
+  DCHECK(block_files_.size() >= 4);
+  DCHECK(address.is_block_file() || !address.is_initialized());
+  if (!address.is_initialized())
+    return NULL;
 
   int file_index = address.FileNumber();
   if (static_cast<unsigned int>(file_index) >= block_files_.size() ||
       !block_files_[file_index]) {
     // We need to open the file
     if (!OpenBlockFile(file_index))
       return NULL;
   }
   DCHECK(block_files_.size() >= static_cast<unsigned int>(file_index));
   return block_files_[file_index];
@@ skipping 155 matching lines @@
     int num_entries = (file_size - sizeof(*header)) / header->entry_size;
     header->max_entries = num_entries;
   }
 
   FixAllocationCounters(header);
   header->updating = 0;
   return true;
 }
 
 }  // namespace disk_cache