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/*********************************************************************
* NAN - Native Abstractions for Node.js
*
* Copyright (c) 2018 NAN contributors
*
* MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
********************************************************************/
#ifndef NAN_TYPEDARRAY_CONTENTS_H_
#define NAN_TYPEDARRAY_CONTENTS_H_
template<typename T>
class TypedArrayContents {
public:
inline explicit TypedArrayContents(v8::Local<v8::Value> from) :
length_(0), data_(NULL) {
HandleScope scope;
size_t length = 0;
void* data = NULL;
#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 || \
(V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
if (from->IsArrayBufferView()) {
v8::Local<v8::ArrayBufferView> array =
v8::Local<v8::ArrayBufferView>::Cast(from);
const size_t byte_length = array->ByteLength();
const ptrdiff_t byte_offset = array->ByteOffset();
v8::Local<v8::ArrayBuffer> buffer = array->Buffer();
length = byte_length / sizeof(T);
// Actually it's 7.9 here but this would lead to ABI issues with Node.js 13
// using 7.8 till 13.2.0.
#if (V8_MAJOR_VERSION >= 8)
data = static_cast<char*>(buffer->GetBackingStore()->Data()) + byte_offset;
#else
data = static_cast<char*>(buffer->GetContents().Data()) + byte_offset;
#endif
}
#else
if (from->IsObject() && !from->IsNull()) {
v8::Local<v8::Object> array = v8::Local<v8::Object>::Cast(from);
MaybeLocal<v8::Value> buffer = Get(array,
New<v8::String>("buffer").ToLocalChecked());
MaybeLocal<v8::Value> byte_length = Get(array,
New<v8::String>("byteLength").ToLocalChecked());
MaybeLocal<v8::Value> byte_offset = Get(array,
New<v8::String>("byteOffset").ToLocalChecked());
if (!buffer.IsEmpty() &&
!byte_length.IsEmpty() && byte_length.ToLocalChecked()->IsUint32() &&
!byte_offset.IsEmpty() && byte_offset.ToLocalChecked()->IsUint32()) {
data = array->GetIndexedPropertiesExternalArrayData();
if(data) {
length = byte_length.ToLocalChecked()->Uint32Value() / sizeof(T);
}
}
}
#endif
#if defined(_MSC_VER) && _MSC_VER >= 1900 || __cplusplus >= 201103L
assert(reinterpret_cast<uintptr_t>(data) % alignof (T) == 0);
#elif defined(_MSC_VER) && _MSC_VER >= 1600 || defined(__GNUC__)
assert(reinterpret_cast<uintptr_t>(data) % __alignof(T) == 0);
#else
assert(reinterpret_cast<uintptr_t>(data) % sizeof (T) == 0);
#endif
length_ = length;
data_ = static_cast<T*>(data);
}
inline size_t length() const { return length_; }
inline T* operator*() { return data_; }
inline const T* operator*() const { return data_; }
private:
NAN_DISALLOW_ASSIGN_COPY_MOVE(TypedArrayContents)
//Disable heap allocation
void *operator new(size_t size);
void operator delete(void *, size_t) {
abort();
}
size_t length_;
T* data_;
};
#endif // NAN_TYPEDARRAY_CONTENTS_H_
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