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node_string.cc
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164 lines (143 loc) · 5.84 KB
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#include "node_string.h"
#include "crdtp/json.h"
#include "node/inspector/protocol/Protocol.h"
#include "simdutf.h"
#include "util-inl.h"
namespace crdtp {
bool ProtocolTypeTraits<std::string>::Deserialize(DeserializerState* state,
std::string* value) {
if (state->tokenizer()->TokenTag() == cbor::CBORTokenTag::STRING8) {
span<uint8_t> cbor_span = state->tokenizer()->GetString8();
value->assign(reinterpret_cast<const char*>(cbor_span.data()),
cbor_span.size());
return true;
}
CHECK(state->tokenizer()->TokenTag() == cbor::CBORTokenTag::STRING16);
span<uint8_t> utf16le = state->tokenizer()->GetString16WireRep();
value->assign(node::inspector::protocol::StringUtil::fromUTF16LE(
reinterpret_cast<const uint16_t*>(utf16le.data()),
utf16le.size() / sizeof(uint16_t)));
return true;
}
void ProtocolTypeTraits<std::string>::Serialize(const std::string& value,
std::vector<uint8_t>* bytes) {
cbor::EncodeString8(SpanFrom(value), bytes);
}
bool ProtocolTypeTraits<node::inspector::protocol::Binary>::Deserialize(
DeserializerState* state, node::inspector::protocol::Binary* value) {
CHECK(state->tokenizer()->TokenTag() == cbor::CBORTokenTag::BINARY);
span<uint8_t> cbor_span = state->tokenizer()->GetBinary();
*value = node::inspector::protocol::Binary::fromSpan(cbor_span);
return true;
}
void ProtocolTypeTraits<node::inspector::protocol::Binary>::Serialize(
const node::inspector::protocol::Binary& value,
std::vector<uint8_t>* bytes) {
cbor::EncodeString8(SpanFrom(value.toBase64()), bytes);
}
} // namespace crdtp
namespace node {
namespace inspector {
namespace protocol {
String StringUtil::StringViewToUtf8(v8_inspector::StringView view) {
if (view.length() == 0)
return "";
if (view.is8Bit()) {
return std::string(reinterpret_cast<const char*>(view.characters8()),
view.length());
}
return fromUTF16(view.characters16(), view.length());
}
String StringUtil::fromUTF16(const uint16_t* data, size_t length) {
auto casted_data = reinterpret_cast<const char16_t*>(data);
size_t expected_utf8_length =
simdutf::utf8_length_from_utf16(casted_data, length);
MaybeStackBuffer<char> buffer(expected_utf8_length);
// simdutf::convert_utf16_to_utf8 returns zero in case of error.
size_t utf8_length =
simdutf::convert_utf16_to_utf8(casted_data, length, buffer.out());
// We have that utf8_length == expected_utf8_length if and only
// if the input was a valid UTF-16 string. Otherwise, utf8_length
// must be zero.
CHECK(utf8_length == 0 || utf8_length == expected_utf8_length);
// An invalid UTF-16 input will generate the empty string:
return String(buffer.out(), utf8_length);
}
String StringUtil::fromUTF8(const uint8_t* data, size_t length) {
return std::string(reinterpret_cast<const char*>(data), length);
}
String StringUtil::fromUTF16LE(const uint16_t* data, size_t length) {
auto casted_data = reinterpret_cast<const char16_t*>(data);
size_t expected_utf8_length =
simdutf::utf8_length_from_utf16le(casted_data, length);
MaybeStackBuffer<char> buffer(expected_utf8_length);
// simdutf::convert_utf16le_to_utf8 returns zero in case of error.
size_t utf8_length =
simdutf::convert_utf16le_to_utf8(casted_data, length, buffer.out());
// We have that utf8_length == expected_utf8_length if and only
// if the input was a valid UTF-16 string. Otherwise, utf8_length
// must be zero.
CHECK(utf8_length == 0 || utf8_length == expected_utf8_length);
// An invalid UTF-16 input will generate the empty string:
return String(buffer.out(), utf8_length);
}
const uint8_t* StringUtil::CharactersUTF8(const std::string_view s) {
return reinterpret_cast<const uint8_t*>(s.data());
}
size_t StringUtil::CharacterCount(const std::string_view s) {
// Return the length of underlying representation storage.
// E.g. for std::basic_string_view<char>, return its byte length.
// If we adopt a variant underlying store string type, like
// `v8_inspector::StringView`, for UTF16, return the length of the
// underlying uint16_t store.
return s.length();
}
String Binary::toBase64() const {
MaybeStackBuffer<char> buffer;
size_t str_len = simdutf::base64_length_from_binary(bytes_->size());
buffer.SetLength(str_len);
size_t len =
simdutf::binary_to_base64(reinterpret_cast<const char*>(bytes_->data()),
bytes_->size(),
buffer.out());
CHECK_EQ(len, str_len);
return buffer.ToString();
}
// static
Binary Binary::concat(const std::vector<Binary>& binaries) {
size_t total_size = 0;
for (const auto& binary : binaries) {
total_size += binary.size();
}
auto bytes = std::make_shared<std::vector<uint8_t>>(total_size);
uint8_t* data_ptr = bytes->data();
for (const auto& binary : binaries) {
memcpy(data_ptr, binary.data(), binary.size());
data_ptr += binary.size();
}
return Binary(bytes);
}
// static
Binary Binary::fromBase64(const String& base64, bool* success) {
Binary binary{};
size_t base64_len = simdutf::maximal_binary_length_from_base64(
base64.data(), base64.length());
binary.bytes_->resize(base64_len);
simdutf::result result;
result =
simdutf::base64_to_binary(base64.data(),
base64.length(),
reinterpret_cast<char*>(binary.bytes_->data()));
CHECK_EQ(result.error, simdutf::error_code::SUCCESS);
return binary;
}
// static
Binary Binary::fromUint8Array(v8::Local<v8::Uint8Array> data) {
auto bytes = std::make_shared<std::vector<uint8_t>>(data->ByteLength());
size_t size = data->CopyContents(bytes->data(), data->ByteLength());
CHECK_EQ(size, data->ByteLength());
return Binary(bytes);
}
} // namespace protocol
} // namespace inspector
} // namespace node