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Side by Side Diff: third_party/mojo/src/mojo/public/cpp/bindings/lib/bindings_serialization.h

Issue 1410053006: Move third_party/mojo/src/mojo/public to mojo/public (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: merge Created 5 years, 1 month ago
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1 // Copyright 2013 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 MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_H_
6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_H_
7
8 #include <vector>
9
10 #include "mojo/public/cpp/bindings/interface_ptr.h"
11 #include "mojo/public/cpp/bindings/lib/bindings_internal.h"
12 #include "mojo/public/cpp/system/core.h"
13
14 namespace mojo {
15 namespace internal {
16
17 // Please note that this is a different value than |mojo::kInvalidHandleValue|,
18 // which is the "decoded" invalid handle.
19 const MojoHandle kEncodedInvalidHandleValue = static_cast<MojoHandle>(-1);
20
21 size_t Align(size_t size);
22 char* AlignPointer(char* ptr);
23
24 bool IsAligned(const void* ptr);
25
26 // Pointers are encoded as relative offsets. The offsets are relative to the
27 // address of where the offset value is stored, such that the pointer may be
28 // recovered with the expression:
29 //
30 // ptr = reinterpret_cast<char*>(offset) + *offset
31 //
32 // A null pointer is encoded as an offset value of 0.
33 //
34 void EncodePointer(const void* ptr, uint64_t* offset);
35 // Note: This function doesn't validate the encoded pointer value.
36 const void* DecodePointerRaw(const uint64_t* offset);
37
38 // Note: This function doesn't validate the encoded pointer value.
39 template <typename T>
40 inline void DecodePointer(const uint64_t* offset, T** ptr) {
41 *ptr = reinterpret_cast<T*>(const_cast<void*>(DecodePointerRaw(offset)));
42 }
43
44 // Handles are encoded as indices into a vector of handles. These functions
45 // manipulate the value of |handle|, mapping it to and from an index.
46
47 void EncodeHandle(Handle* handle, std::vector<Handle>* handles);
48 void EncodeHandle(Interface_Data* data, std::vector<Handle>* handles);
49 void EncodeHandle(MojoHandle* handle, std::vector<Handle>* handles);
50 // Note: The following three functions don't validate the encoded handle value.
51 void DecodeHandle(Handle* handle, std::vector<Handle>* handles);
52 void DecodeHandle(Interface_Data* data, std::vector<Handle>* handles);
53 void DecodeHandle(MojoHandle* handle, std::vector<Handle>* handles);
54
55 // The following 2 functions are used to encode/decode all objects (structs and
56 // arrays) in a consistent manner.
57
58 template <typename T>
59 inline void Encode(T* obj, std::vector<Handle>* handles) {
60 if (obj->ptr)
61 obj->ptr->EncodePointersAndHandles(handles);
62 EncodePointer(obj->ptr, &obj->offset);
63 }
64
65 // Note: This function doesn't validate the encoded pointer and handle values.
66 template <typename T>
67 inline void Decode(T* obj, std::vector<Handle>* handles) {
68 DecodePointer(&obj->offset, &obj->ptr);
69 if (obj->ptr)
70 obj->ptr->DecodePointersAndHandles(handles);
71 }
72
73 template <typename T>
74 inline void InterfacePointerToData(InterfacePtr<T> input,
75 Interface_Data* output) {
76 InterfacePtrInfo<T> info = input.PassInterface();
77 output->handle = info.PassHandle().release();
78 output->version = info.version();
79 }
80
81 template <typename T>
82 inline void InterfaceDataToPointer(Interface_Data* input,
83 InterfacePtr<T>* output) {
84 output->Bind(InterfacePtrInfo<T>(
85 MakeScopedHandle(FetchAndReset(&input->handle)), input->version));
86 }
87
88 } // namespace internal
89 } // namespace mojo
90
91 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_H_
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