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87 lines
2.8 KiB
87 lines
2.8 KiB
/********************************************************************* |
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* NAN - Native Abstractions for Node.js |
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* |
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* Copyright (c) 2016 NAN contributors |
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* |
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* MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md> |
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********************************************************************/ |
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#ifndef NAN_TYPEDARRAY_CONTENTS_H_ |
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#define NAN_TYPEDARRAY_CONTENTS_H_ |
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template<typename T> |
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class TypedArrayContents { |
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public: |
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inline explicit TypedArrayContents(v8::Local<v8::Value> from) : |
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length_(0), data_(NULL) { |
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size_t length = 0; |
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void* data = NULL; |
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#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 || \ |
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(V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3)) |
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if (from->IsArrayBufferView()) { |
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v8::Local<v8::ArrayBufferView> array = |
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v8::Local<v8::ArrayBufferView>::Cast(from); |
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const size_t byte_length = array->ByteLength(); |
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const ptrdiff_t byte_offset = array->ByteOffset(); |
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v8::Local<v8::ArrayBuffer> buffer = array->Buffer(); |
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length = byte_length / sizeof(T); |
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data = static_cast<char*>(buffer->GetContents().Data()) + byte_offset; |
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} |
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#else |
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if (from->IsObject() && !from->IsNull()) { |
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v8::Local<v8::Object> array = v8::Local<v8::Object>::Cast(from); |
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MaybeLocal<v8::Value> buffer = Get(array, |
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New<v8::String>("buffer").ToLocalChecked()); |
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MaybeLocal<v8::Value> byte_length = Get(array, |
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New<v8::String>("byteLength").ToLocalChecked()); |
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MaybeLocal<v8::Value> byte_offset = Get(array, |
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New<v8::String>("byteOffset").ToLocalChecked()); |
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if (!buffer.IsEmpty() && |
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!byte_length.IsEmpty() && byte_length.ToLocalChecked()->IsUint32() && |
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!byte_offset.IsEmpty() && byte_offset.ToLocalChecked()->IsUint32()) { |
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data = array->GetIndexedPropertiesExternalArrayData(); |
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if(data) { |
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length = byte_length.ToLocalChecked()->Uint32Value() / sizeof(T); |
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} |
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} |
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} |
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#endif |
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#if defined(_MSC_VER) && _MSC_VER >= 1900 || __cplusplus >= 201103L |
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assert(reinterpret_cast<uintptr_t>(data) % alignof (T) == 0); |
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#elif defined(_MSC_VER) && _MSC_VER >= 1600 || defined(__GNUC__) |
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assert(reinterpret_cast<uintptr_t>(data) % __alignof(T) == 0); |
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#else |
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assert(reinterpret_cast<uintptr_t>(data) % sizeof (T) == 0); |
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#endif |
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length_ = length; |
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data_ = static_cast<T*>(data); |
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} |
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inline size_t length() const { return length_; } |
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inline T* operator*() { return data_; } |
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inline const T* operator*() const { return data_; } |
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private: |
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NAN_DISALLOW_ASSIGN_COPY_MOVE(TypedArrayContents) |
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//Disable heap allocation |
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void *operator new(size_t size); |
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void operator delete(void *, size_t); |
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size_t length_; |
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T* data_; |
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}; |
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#endif // NAN_TYPEDARRAY_CONTENTS_H_
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