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LibWeb: Respect subarrays in TextEncoder::encode_into

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This is the method that Figma uses to write strings into Wasm memory,
using subarrays to select a particular Wasm memory address to write to.
This commit is contained in:
Luke Wilde
2025-01-09 16:30:30 +00:00
committed by Andreas Kling
parent 513231216a
commit 3ab93667f5
3 changed files with 10 additions and 10 deletions
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4
Libraries/LibWeb/Encoding/TextEncoder.cpp
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@@ -53,7 +53,7 @@ GC::Ref<JS::Uint8Array> TextEncoder::encode(String const& input) const
// https://encoding.spec.whatwg.org/#dom-textencoder-encodeinto
TextEncoderEncodeIntoResult TextEncoder::encode_into(String const& source, GC::Root<WebIDL::BufferSource> const& destination) const
{
auto& data = destination->viewed_array_buffer()->buffer();
auto data = destination->viewed_array_buffer()->buffer().bytes().slice(destination->byte_offset(), destination->byte_length());
// 1. Let read be 0.
WebIDL::UnsignedLongLong read = 0;
@@ -79,7 +79,7 @@ TextEncoderEncodeIntoResult TextEncoder::encode_into(String const& source, GC::R
// 6.4. Otherwise:
// 6.4.1. If destination’s byte length − written is greater than or equal to the number of bytes in result, then:
if (data.size() - written >= result.size()) {
if (destination->byte_length() - written >= result.size()) {
// 6.4.1.1. If item is greater than U+FFFF, then increment read by 2.
if (item > 0xffff) {
read += 2;