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 PPAPI_PROXY_PPAPI_MESSAGE_UTILS_H_ 6 #define PPAPI_PROXY_PPAPI_MESSAGE_UTILS_H_ 7 8 #include "base/basictypes.h" 9 #include "base/pickle.h" 10 #include "base/tuple.h" 11 #include "ipc/ipc_message.h" 12 #include "ipc/ipc_message_utils.h" 13 14 namespace ppapi { 15 16 namespace internal { 17 18 // TupleTypeMatch* check whether a tuple type contains elements of the specified 19 // types. They are used to make sure the output parameters of UnpackMessage() 20 // match the corresponding message type. 21 template <class TupleType, class A> 22 struct TupleTypeMatch1 { 23 static const bool kValue = false; 24 }; 25 template <class A> 26 struct TupleTypeMatch1<Tuple1<A>, A> { 27 static const bool kValue = true; 28 }; 29 30 template <class TupleType, class A, class B> 31 struct TupleTypeMatch2 { 32 static const bool kValue = false; 33 }; 34 template <class A, class B> 35 struct TupleTypeMatch2<Tuple2<A, B>, A, B> { 36 static const bool kValue = true; 37 }; 38 39 template <class TupleType, class A, class B, class C> 40 struct TupleTypeMatch3 { 41 static const bool kValue = false; 42 }; 43 template <class A, class B, class C> 44 struct TupleTypeMatch3<Tuple3<A, B, C>, A, B, C> { 45 static const bool kValue = true; 46 }; 47 48 template <class TupleType, class A, class B, class C, class D> 49 struct TupleTypeMatch4 { 50 static const bool kValue = false; 51 }; 52 template <class A, class B, class C, class D> 53 struct TupleTypeMatch4<Tuple4<A, B, C, D>, A, B, C, D> { 54 static const bool kValue = true; 55 }; 56 57 template <class TupleType, class A, class B, class C, class D, class E> 58 struct TupleTypeMatch5 { 59 static const bool kValue = false; 60 }; 61 template <class A, class B, class C, class D, class E> 62 struct TupleTypeMatch5<Tuple5<A, B, C, D, E>, A, B, C, D, E> { 63 static const bool kValue = true; 64 }; 65 66 } // namespace internal 67 68 template <class MsgClass, class A> 69 bool UnpackMessage(const IPC::Message& msg, A* a) { 70 COMPILE_ASSERT( 71 (internal::TupleTypeMatch1<typename MsgClass::Param, A>::kValue), 72 tuple_types_dont_match); 73 74 PickleIterator iter(msg); 75 return IPC::ReadParam(&msg, &iter, a); 76 } 77 78 template <class MsgClass, class A, class B> 79 bool UnpackMessage(const IPC::Message& msg, A* a, B* b) { 80 COMPILE_ASSERT( 81 (internal::TupleTypeMatch2<typename MsgClass::Param, A, B>::kValue), 82 tuple_types_dont_match); 83 84 PickleIterator iter(msg); 85 return IPC::ReadParam(&msg, &iter, a) && IPC::ReadParam(&msg, &iter, b); 86 } 87 88 template <class MsgClass, class A, class B, class C> 89 bool UnpackMessage(const IPC::Message& msg, A* a, B* b, C* c) { 90 COMPILE_ASSERT( 91 (internal::TupleTypeMatch3<typename MsgClass::Param, A, B, C>::kValue), 92 tuple_types_dont_match); 93 94 PickleIterator iter(msg); 95 return IPC::ReadParam(&msg, &iter, a) && 96 IPC::ReadParam(&msg, &iter, b) && 97 IPC::ReadParam(&msg, &iter, c); 98 } 99 100 template <class MsgClass, class A, class B, class C, class D> 101 bool UnpackMessage(const IPC::Message& msg, A* a, B* b, C* c, D* d) { 102 COMPILE_ASSERT( 103 (internal::TupleTypeMatch4<typename MsgClass::Param, A, B, C, D>::kValue), 104 tuple_types_dont_match); 105 106 PickleIterator iter(msg); 107 return IPC::ReadParam(&msg, &iter, a) && 108 IPC::ReadParam(&msg, &iter, b) && 109 IPC::ReadParam(&msg, &iter, c) && 110 IPC::ReadParam(&msg, &iter, d); 111 } 112 113 template <class MsgClass, class A, class B, class C, class D, class E> 114 bool UnpackMessage(const IPC::Message& msg, A* a, B* b, C* c, D* d, E* e) { 115 COMPILE_ASSERT( 116 (internal::TupleTypeMatch5< 117 typename MsgClass::Param, A, B, C, D, E>::kValue), 118 tuple_types_dont_match); 119 120 PickleIterator iter(msg); 121 return IPC::ReadParam(&msg, &iter, a) && 122 IPC::ReadParam(&msg, &iter, b) && 123 IPC::ReadParam(&msg, &iter, c) && 124 IPC::ReadParam(&msg, &iter, d) && 125 IPC::ReadParam(&msg, &iter, e); 126 } 127 128 } // namespace ppapi 129 130 #endif // PPAPI_PROXY_PPAPI_MESSAGE_UTILS_H_ 131 132
