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#ifndef SRC_NODE_UNION_BYTES_H_ |
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#define SRC_NODE_UNION_BYTES_H_ |
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#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS |
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// A union of const uint8_t* or const uint16_t* data that can be |
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// turned into external v8::String when given an isolate. |
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#include "v8.h" |
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namespace node { |
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class NonOwningExternalOneByteResource |
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: public v8::String::ExternalOneByteStringResource { |
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public: |
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explicit NonOwningExternalOneByteResource(const uint8_t* data, size_t length) |
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: data_(data), length_(length) {} |
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~NonOwningExternalOneByteResource() override = default; |
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const char* data() const override { |
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return reinterpret_cast<const char*>(data_); |
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} |
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size_t length() const override { return length_; } |
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NonOwningExternalOneByteResource(const NonOwningExternalOneByteResource&) = |
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delete; |
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NonOwningExternalOneByteResource& operator=( |
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const NonOwningExternalOneByteResource&) = delete; |
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private: |
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const uint8_t* data_; |
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size_t length_; |
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}; |
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class NonOwningExternalTwoByteResource |
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: public v8::String::ExternalStringResource { |
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public: |
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explicit NonOwningExternalTwoByteResource(const uint16_t* data, size_t length) |
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: data_(data), length_(length) {} |
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~NonOwningExternalTwoByteResource() override = default; |
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const uint16_t* data() const override { return data_; } |
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size_t length() const override { return length_; } |
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NonOwningExternalTwoByteResource(const NonOwningExternalTwoByteResource&) = |
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delete; |
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NonOwningExternalTwoByteResource& operator=( |
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const NonOwningExternalTwoByteResource&) = delete; |
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private: |
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const uint16_t* data_; |
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size_t length_; |
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}; |
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// Similar to a v8::String, but it's independent from Isolates |
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// and can be materialized in Isolates as external Strings |
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// via ToStringChecked. The data pointers are owned by the caller. |
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class UnionBytes { |
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public: |
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UnionBytes(const uint16_t* data, size_t length) |
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: one_bytes_(nullptr), two_bytes_(data), length_(length) {} |
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UnionBytes(const uint8_t* data, size_t length) |
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: one_bytes_(data), two_bytes_(nullptr), length_(length) {} |
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UnionBytes(const UnionBytes&) = default; |
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UnionBytes& operator=(const UnionBytes&) = default; |
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UnionBytes(UnionBytes&&) = default; |
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UnionBytes& operator=(UnionBytes&&) = default; |
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bool is_one_byte() const { return one_bytes_ != nullptr; } |
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const uint16_t* two_bytes_data() const { |
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✗✓ |
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CHECK_NOT_NULL(two_bytes_); |
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return two_bytes_; |
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} |
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const uint8_t* one_bytes_data() const { |
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✗✓ |
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CHECK_NOT_NULL(one_bytes_); |
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return one_bytes_; |
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} |
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v8::Local<v8::String> ToStringChecked(v8::Isolate* isolate) const { |
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✓✓ |
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if (is_one_byte()) { |
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NonOwningExternalOneByteResource* source = |
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new NonOwningExternalOneByteResource(one_bytes_data(), length_); |
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return v8::String::NewExternalOneByte(isolate, source).ToLocalChecked(); |
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} else { |
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NonOwningExternalTwoByteResource* source = |
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new NonOwningExternalTwoByteResource(two_bytes_data(), length_); |
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return v8::String::NewExternalTwoByte(isolate, source).ToLocalChecked(); |
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} |
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} |
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size_t length() { return length_; } |
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private: |
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const uint8_t* one_bytes_; |
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const uint16_t* two_bytes_; |
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size_t length_; |
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}; |
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} // namespace node |
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#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS |
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#endif // SRC_NODE_UNION_BYTES_H_ |