1// Copyright 2014 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#include "content/common/android/gin_java_bridge_value.h" 6 7namespace content { 8 9namespace { 10 11// The magic value is only used to prevent accidental attempts of reading 12// GinJavaBridgeValue from a random BinaryValue. GinJavaBridgeValue is not 13// intended for scenarios where with BinaryValues are being used for anything 14// else than holding GinJavaBridgeValues. If a need for such scenario ever 15// emerges, the best solution would be to extend GinJavaBridgeValue to be able 16// to wrap raw BinaryValues. 17const uint32 kHeaderMagic = 0xBEEFCAFE; 18 19#pragma pack(push, 4) 20struct Header : public Pickle::Header { 21 uint32 magic; 22 int32 type; 23}; 24#pragma pack(pop) 25 26} 27 28// static 29scoped_ptr<base::BinaryValue> GinJavaBridgeValue::CreateUndefinedValue() { 30 GinJavaBridgeValue gin_value(TYPE_UNDEFINED); 31 return make_scoped_ptr(gin_value.SerializeToBinaryValue()); 32} 33 34// static 35scoped_ptr<base::BinaryValue> GinJavaBridgeValue::CreateNonFiniteValue( 36 float in_value) { 37 GinJavaBridgeValue gin_value(TYPE_NONFINITE); 38 gin_value.pickle_.WriteFloat(in_value); 39 return make_scoped_ptr(gin_value.SerializeToBinaryValue()); 40} 41 42// static 43scoped_ptr<base::BinaryValue> GinJavaBridgeValue::CreateNonFiniteValue( 44 double in_value) { 45 return CreateNonFiniteValue(static_cast<float>(in_value)).Pass(); 46} 47 48// static 49scoped_ptr<base::BinaryValue> GinJavaBridgeValue::CreateObjectIDValue( 50 int32 in_value) { 51 GinJavaBridgeValue gin_value(TYPE_OBJECT_ID); 52 gin_value.pickle_.WriteInt(in_value); 53 return make_scoped_ptr(gin_value.SerializeToBinaryValue()); 54} 55 56// static 57bool GinJavaBridgeValue::ContainsGinJavaBridgeValue(const base::Value* value) { 58 if (!value->IsType(base::Value::TYPE_BINARY)) 59 return false; 60 const base::BinaryValue* binary_value = 61 reinterpret_cast<const base::BinaryValue*>(value); 62 if (binary_value->GetSize() < sizeof(Header)) 63 return false; 64 Pickle pickle(binary_value->GetBuffer(), binary_value->GetSize()); 65 // Broken binary value: payload or header size is wrong 66 if (!pickle.data() || pickle.size() - pickle.payload_size() != sizeof(Header)) 67 return false; 68 Header* header = pickle.headerT<Header>(); 69 return (header->magic == kHeaderMagic && 70 header->type >= TYPE_FIRST_VALUE && header->type < TYPE_LAST_VALUE); 71} 72 73// static 74scoped_ptr<const GinJavaBridgeValue> GinJavaBridgeValue::FromValue( 75 const base::Value* value) { 76 return scoped_ptr<const GinJavaBridgeValue>( 77 value->IsType(base::Value::TYPE_BINARY) 78 ? new GinJavaBridgeValue( 79 reinterpret_cast<const base::BinaryValue*>(value)) 80 : NULL); 81} 82 83GinJavaBridgeValue::Type GinJavaBridgeValue::GetType() const { 84 const Header* header = pickle_.headerT<Header>(); 85 DCHECK(header->type >= TYPE_FIRST_VALUE && header->type < TYPE_LAST_VALUE); 86 return static_cast<Type>(header->type); 87} 88 89bool GinJavaBridgeValue::IsType(Type type) const { 90 return GetType() == type; 91} 92 93bool GinJavaBridgeValue::GetAsNonFinite(float* out_value) const { 94 if (GetType() == TYPE_NONFINITE) { 95 PickleIterator iter(pickle_); 96 return iter.ReadFloat(out_value); 97 } else { 98 return false; 99 } 100} 101 102bool GinJavaBridgeValue::GetAsObjectID(int32* out_object_id) const { 103 if (GetType() == TYPE_OBJECT_ID) { 104 PickleIterator iter(pickle_); 105 return iter.ReadInt(out_object_id); 106 } else { 107 return false; 108 } 109} 110 111GinJavaBridgeValue::GinJavaBridgeValue(Type type) : 112 pickle_(sizeof(Header)) { 113 Header* header = pickle_.headerT<Header>(); 114 header->magic = kHeaderMagic; 115 header->type = type; 116} 117 118GinJavaBridgeValue::GinJavaBridgeValue(const base::BinaryValue* value) 119 : pickle_(value->GetBuffer(), value->GetSize()) { 120 DCHECK(ContainsGinJavaBridgeValue(value)); 121} 122 123base::BinaryValue* GinJavaBridgeValue::SerializeToBinaryValue() { 124 return base::BinaryValue::CreateWithCopiedBuffer( 125 reinterpret_cast<const char*>(pickle_.data()), pickle_.size()); 126} 127 128} // namespace content 129