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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 #include "ppapi/shared_impl/ppapi_shared_export.h" |
| 12 | 12 |
| 13 namespace ppapi { | 13 namespace ppapi { |
| 14 | 14 |
| 15 enum PPIdType { | 15 enum PPIdType { |
| 16 PP_ID_TYPE_MODULE, | 16 PP_ID_TYPE_MODULE, |
| 17 PP_ID_TYPE_INSTANCE, | 17 PP_ID_TYPE_INSTANCE, |
| 18 PP_ID_TYPE_RESOURCE, | 18 PP_ID_TYPE_RESOURCE, |
| 19 PP_ID_TYPE_VAR, | 19 PP_ID_TYPE_VAR, |
| 20 | 20 |
| 21 // Not a real type, must be last. | 21 // Not a real type, must be last. |
| 22 PP_ID_TYPE_COUNT | 22 PP_ID_TYPE_COUNT |
| 23 }; | 23 }; |
| 24 | 24 |
| 25 PPAPI_SHARED_EXPORT extern const unsigned int kPPIdTypeBits; | 25 PPAPI_SHARED_EXPORT extern const unsigned int kPPIdTypeBits; |
| 26 | 26 |
| 27 extern const int32 kMaxPPId; | 27 extern const int32 kMaxPPId; |
| 28 | 28 |
| 29 // The least significant bits are the type, the rest are the value. | 29 // The least significant bits are the type, the rest are the value. |
| 30 template <typename T> inline T MakeTypedId(T value, PPIdType type) { | 30 template <typename T> |
| 31 inline T MakeTypedId(T value, PPIdType type) { |
| 31 return (value << kPPIdTypeBits) | static_cast<T>(type); | 32 return (value << kPPIdTypeBits) | static_cast<T>(type); |
| 32 } | 33 } |
| 33 | 34 |
| 34 template <typename T> inline bool CheckIdType(T id, PPIdType type) { | 35 template <typename T> |
| 36 inline bool CheckIdType(T id, PPIdType type) { |
| 35 // Say a resource of 0 is always valid, since that means "no resource." | 37 // Say a resource of 0 is always valid, since that means "no resource." |
| 36 // You shouldn't be passing 0 var, instance, or module IDs around so those | 38 // You shouldn't be passing 0 var, instance, or module IDs around so those |
| 37 // are still invalid. | 39 // are still invalid. |
| 38 if (type == PP_ID_TYPE_RESOURCE && !id) | 40 if (type == PP_ID_TYPE_RESOURCE && !id) |
| 39 return true; | 41 return true; |
| 40 const T mask = (static_cast<T>(1) << kPPIdTypeBits) - 1; | 42 const T mask = (static_cast<T>(1) << kPPIdTypeBits) - 1; |
| 41 return (id & mask) == type; | 43 return (id & mask) == type; |
| 42 } | 44 } |
| 43 | 45 |
| 44 } // namespace ppapi | 46 } // namespace ppapi |
| 45 | 47 |
| 46 #endif // PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_ | 48 #endif // PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_ |
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