GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: node_union_bytes.h Lines: 28 28 100.0 %
Date: 2022-06-05 04:15:40 Branches: 4 6 66.7 %

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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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    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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    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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    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_