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92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_H_
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#define MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_H_
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#include <vector>
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#include "mojo/public/cpp/bindings/interface_ptr.h"
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#include "mojo/public/cpp/bindings/lib/bindings_internal.h"
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#include "mojo/public/cpp/system/core.h"
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namespace mojo {
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namespace internal {
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// Please note that this is a different value than |mojo::kInvalidHandleValue|,
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// which is the "decoded" invalid handle.
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const MojoHandle kEncodedInvalidHandleValue = static_cast<MojoHandle>(-1);
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size_t Align(size_t size);
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char* AlignPointer(char* ptr);
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bool IsAligned(const void* ptr);
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// Pointers are encoded as relative offsets. The offsets are relative to the
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// address of where the offset value is stored, such that the pointer may be
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// recovered with the expression:
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//
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// ptr = reinterpret_cast<char*>(offset) + *offset
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//
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// A null pointer is encoded as an offset value of 0.
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//
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void EncodePointer(const void* ptr, uint64_t* offset);
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// Note: This function doesn't validate the encoded pointer value.
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const void* DecodePointerRaw(const uint64_t* offset);
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// Note: This function doesn't validate the encoded pointer value.
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template <typename T>
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inline void DecodePointer(const uint64_t* offset, T** ptr) {
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*ptr = reinterpret_cast<T*>(const_cast<void*>(DecodePointerRaw(offset)));
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}
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// Handles are encoded as indices into a vector of handles. These functions
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// manipulate the value of |handle|, mapping it to and from an index.
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void EncodeHandle(Handle* handle, std::vector<Handle>* handles);
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void EncodeHandle(Interface_Data* data, std::vector<Handle>* handles);
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void EncodeHandle(MojoHandle* handle, std::vector<Handle>* handles);
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// Note: The following three functions don't validate the encoded handle value.
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void DecodeHandle(Handle* handle, std::vector<Handle>* handles);
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void DecodeHandle(Interface_Data* data, std::vector<Handle>* handles);
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void DecodeHandle(MojoHandle* handle, std::vector<Handle>* handles);
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// The following 2 functions are used to encode/decode all objects (structs and
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// arrays) in a consistent manner.
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template <typename T>
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inline void Encode(T* obj, std::vector<Handle>* handles) {
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if (obj->ptr)
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obj->ptr->EncodePointersAndHandles(handles);
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EncodePointer(obj->ptr, &obj->offset);
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}
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// Note: This function doesn't validate the encoded pointer and handle values.
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template <typename T>
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inline void Decode(T* obj, std::vector<Handle>* handles) {
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DecodePointer(&obj->offset, &obj->ptr);
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if (obj->ptr)
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obj->ptr->DecodePointersAndHandles(handles);
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}
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template <typename T>
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inline void InterfacePointerToData(InterfacePtr<T> input,
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Interface_Data* output) {
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InterfacePtrInfo<T> info = input.PassInterface();
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output->handle = info.PassHandle().release();
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output->version = info.version();
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}
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template <typename T>
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inline void InterfaceDataToPointer(Interface_Data* input,
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InterfacePtr<T>* output) {
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output->Bind(InterfacePtrInfo<T>(
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MakeScopedHandle(FetchAndReset(&input->handle)), input->version));
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}
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} // namespace internal
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} // namespace mojo
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#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_H_
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