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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_ | 5 #ifndef PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_ |
6 #define PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_ | 6 #define PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_ |
7 | 7 |
8 #include <limits> | 8 #include <limits> |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
| 11 #include "ppapi/shared_impl/ppapi_shared_export.h" |
11 | 12 |
12 namespace ppapi { | 13 namespace ppapi { |
13 | 14 |
14 enum PPIdType { | 15 enum PPIdType { |
15 PP_ID_TYPE_MODULE, | 16 PP_ID_TYPE_MODULE, |
16 PP_ID_TYPE_INSTANCE, | 17 PP_ID_TYPE_INSTANCE, |
17 PP_ID_TYPE_RESOURCE, | 18 PP_ID_TYPE_RESOURCE, |
18 PP_ID_TYPE_VAR, | 19 PP_ID_TYPE_VAR, |
19 | 20 |
20 // Not a real type, must be last. | 21 // Not a real type, must be last. |
21 PP_ID_TYPE_COUNT | 22 PP_ID_TYPE_COUNT |
22 }; | 23 }; |
23 | 24 |
24 extern const unsigned int kPPIdTypeBits; | 25 PPAPI_SHARED_EXPORT extern const unsigned int kPPIdTypeBits; |
25 | 26 |
26 extern const int32 kMaxPPId; | 27 extern const int32 kMaxPPId; |
27 | 28 |
28 // The most significant bits are the type, the rest are the value. | 29 // The most significant bits are the type, the rest are the value. |
29 template <typename T> inline T MakeTypedId(T value, PPIdType type) { | 30 template <typename T> inline T MakeTypedId(T value, PPIdType type) { |
30 return (value << kPPIdTypeBits) | static_cast<T>(type); | 31 return (value << kPPIdTypeBits) | static_cast<T>(type); |
31 } | 32 } |
32 | 33 |
33 template <typename T> inline bool CheckIdType(T id, PPIdType type) { | 34 template <typename T> inline bool CheckIdType(T id, PPIdType type) { |
34 // Say a resource of 0 is always valid, since that means "no resource." | 35 // Say a resource of 0 is always valid, since that means "no resource." |
35 // You shouldn't be passing 0 var, instance, or module IDs around so those | 36 // You shouldn't be passing 0 var, instance, or module IDs around so those |
36 // are still invalid. | 37 // are still invalid. |
37 if (type == PP_ID_TYPE_RESOURCE && !id) | 38 if (type == PP_ID_TYPE_RESOURCE && !id) |
38 return true; | 39 return true; |
39 const T mask = (static_cast<T>(1) << kPPIdTypeBits) - 1; | 40 const T mask = (static_cast<T>(1) << kPPIdTypeBits) - 1; |
40 return (id & mask) == type; | 41 return (id & mask) == type; |
41 } | 42 } |
42 | 43 |
43 } // namespace ppapi | 44 } // namespace ppapi |
44 | 45 |
45 #endif // PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_ | 46 #endif // PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_ |
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