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- /*********************************************************************
- * NAN - Native Abstractions for Node.js
- *
- * Copyright (c) 2016 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) {
- 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);
- data = static_cast<char*>(buffer->GetContents().Data()) + byte_offset;
- }
- #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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