webkit/media/cache_util.h

   1 // Copyright (c) 2012 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 #ifndef WEBKIT_MEDIA_CACHE_UTIL_H_
   6 #define WEBKIT_MEDIA_CACHE_UTIL_H_
   7
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11
  12 namespace WebKit {
  13 class WebURLResponse;
  14 }
  15
  16 namespace webkit_media {
  17
  18 // Reasons that a cached WebURLResponse will *not* prevent a future request to
  19 // the server.  Reported via UMA, so don't change/reuse previously-existing
  20 // values.
  21 enum UncacheableReason {
  22   kNoData = 1 << 0,  // Not 200 or 206.
  23   kPre11PartialResponse = 1 << 1,  // 206 but HTTP version < 1.1.
  24   kNoStrongValidatorOnPartialResponse = 1 << 2,  // 206, no strong validator.
  25   kShortMaxAge = 1 << 3,  // Max age less than 1h (arbitrary value).
  26   kExpiresTooSoon = 1 << 4,  // Expires in less than 1h (arbitrary value).
  27   kHasMustRevalidate = 1 << 5,  // Response asks for revalidation.
  28   kNoCache = 1 << 6,  // Response included a no-cache header.
  29   kNoStore = 1 << 7,  // Response included a no-store header.
  30   kMaxReason  // Needs to be one more than max legitimate reason.
  31 };
  32
  33 // Return the logical OR of the reasons "response" cannot be used for a future
  34 // request (using the disk cache), or 0 if it might be useful.
  35 uint32 GetReasonsForUncacheability(const WebKit::WebURLResponse& response);
  36
  37 }  // namespace webkit_media
  38
  39 #endif  // WEBKIT_MEDIA_CACHE_UTIL_H_