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LibJS: Add all of the DataView.prototype.set* methods

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Idan Horowitz 2021-06-14 02:02:53 +03:00 • committed by Linus Groh
parent c54b9a6920
commit d7a70eb77c
8 changed files with 203 additions and 0 deletions
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57
Userland/Libraries/LibJS/Runtime/ArrayBuffer.h
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@ -40,6 +40,8 @@ public:
};
template<typename type>
Value get_value(size_t byte_index, bool is_typed_array, Order, bool is_little_endian = true);
template<typename type>
Value set_value(size_t byte_index, Value value, bool is_typed_array, Order, bool is_little_endian = true);
private:
virtual void visit_edges(Visitor&) override;
@ -108,4 +110,59 @@ Value ArrayBuffer::get_value(size_t byte_index, [[maybe_unused]] bool is_typed_a
return raw_bytes_to_numeric<T>(global_object(), move(raw_value), is_little_endian);
}
// 25.1.2.11 NumericToRawBytes ( type, value, isLittleEndian ), https://tc39.es/ecma262/#sec-numerictorawbytes
template<typename T>
static ByteBuffer numeric_to_raw_bytes(GlobalObject& global_object, Value value, bool is_little_endian)
{
ByteBuffer raw_bytes = ByteBuffer::create_uninitialized(sizeof(T));
auto flip_if_needed = [&]() {
if (is_little_endian)
return;
VERIFY(sizeof(T) % 2 == 0);
for (size_t i = 0; i < sizeof(T) / 2; ++i)
swap(raw_bytes[i], raw_bytes[sizeof(T) - 1 - i]);
};
if constexpr (IsSame<T, float>) {
float raw_value = value.to_double(global_object);
ReadonlyBytes { &raw_value, sizeof(float) }.copy_to(raw_bytes);
flip_if_needed();
return raw_bytes;
}
if constexpr (IsSame<T, double>) {
double raw_value = value.to_double(global_object);
ReadonlyBytes { &raw_value, sizeof(double) }.copy_to(raw_bytes);
flip_if_needed();
return raw_bytes;
}
if constexpr (!IsIntegral<T>)
VERIFY_NOT_REACHED();
if constexpr (sizeof(T) == 8) {
u64 int_value = value.as_bigint().big_integer().to_u64();
ReadonlyBytes { &int_value, sizeof(u64) }.copy_to(raw_bytes);
flip_if_needed();
return raw_bytes;
} else {
T int_value;
if constexpr (IsSigned<T>)
int_value = value.to_i32(global_object);
else
int_value = value.to_u32(global_object);
ReadonlyBytes { &int_value, sizeof(T) }.copy_to(raw_bytes);
flip_if_needed();
return raw_bytes;
}
}
// 25.1.2.12 SetValueInBuffer ( arrayBuffer, byteIndex, type, value, isTypedArray, order [ , isLittleEndian ] ), https://tc39.es/ecma262/#sec-setvalueinbuffer
template<typename T>
Value ArrayBuffer::set_value(size_t byte_index, Value value, [[maybe_unused]] bool is_typed_array, Order, bool is_little_endian)
{
auto raw_bytes = numeric_to_raw_bytes<T>(global_object(), value, is_little_endian);
// FIXME: Check for shared buffer
raw_bytes.span().copy_to(buffer_impl().span().slice(byte_index));
return js_undefined();
}
}