/*********************************************************************
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* NAN - Native Abstractions for Node.js
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*
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* Copyright (c) 2018 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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HandleScope scope;
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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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// Actually it's 7.9 here but this would lead to ABI issues with Node.js 13
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// using 7.8 till 13.2.0.
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#if (V8_MAJOR_VERSION >= 8)
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data = static_cast<char*>(buffer->GetBackingStore()->Data()) + byte_offset;
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#else
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data = static_cast<char*>(buffer->GetContents().Data()) + byte_offset;
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#endif
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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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abort();
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}
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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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