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LibWeb: Let get_buffer_source_copy() return ErrorOr instead of Optional

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This is a minor refactor of IDL::get_buffer_source_copy() letting it
return ErrorOr<ByteBuffer> instead of Optional<ByteBuffer>.

This also updates all places that use IDL::get_buffer_source_copy().
This commit is contained in:
Kenneth Myhra 2022-07-22 21:01:36 +02:00 committed by Linus Groh
parent 7a2bef7fe1
commit 9fe12c1851
Notes: sideshowbarker 2024-07-17 08:38:47 +09:00 
Author: https://github.com/kennethmyhra
Commit: https://github.com/SerenityOS/serenity/commit/9fe12c1851
Pull-request: https://github.com/SerenityOS/serenity/pull/14648
Reviewed-by: https://github.com/linusg ✅
5 changed files with 15 additions and 18 deletions
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10
Userland/Libraries/LibWeb/Bindings/IDLAbstractOperations.cpp
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@ -17,7 +17,7 @@
namespace Web::Bindings::IDL {
// https://webidl.spec.whatwg.org/#dfn-get-buffer-source-copy
Optional<ByteBuffer> get_buffer_source_copy(JS::Object const& buffer_source)
ErrorOr<ByteBuffer> get_buffer_source_copy(JS::Object const& buffer_source)
{
// 1. Let esBufferSource be the result of converting bufferSource to an ECMAScript value.
@ -69,18 +69,16 @@ Optional<ByteBuffer> get_buffer_source_copy(JS::Object const& buffer_source)
return ByteBuffer {};
// 8. Let bytes be a new byte sequence of length equal to length.
auto bytes = ByteBuffer::create_zeroed(length);
if (bytes.is_error())
return {};
auto bytes = TRY(ByteBuffer::create_zeroed(length));
// 9. For i in the range offset to offset + length − 1, inclusive, set bytes[i − offset] to ! GetValueFromBuffer(esArrayBuffer, i, Uint8, true, Unordered).
for (u64 i = offset; i <= offset + length - 1; ++i) {
auto value = es_array_buffer->get_value<u8>(i, true, JS::ArrayBuffer::Unordered);
bytes.value()[i - offset] = (u8)value.as_u32();
bytes[i - offset] = (u8)value.as_u32();
}
// 10. Return bytes.
return bytes.release_value();
return bytes;
}
// https://webidl.spec.whatwg.org/#invoke-a-callback-function

2
Userland/Libraries/LibWeb/Bindings/IDLAbstractOperations.h
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@ -16,7 +16,7 @@
namespace Web::Bindings::IDL {
Optional<ByteBuffer> get_buffer_source_copy(JS::Object const& buffer_source);
ErrorOr<ByteBuffer> get_buffer_source_copy(JS::Object const& buffer_source);
// https://webidl.spec.whatwg.org/#call-user-object-operation-return
inline JS::Completion clean_up_on_return(HTML::EnvironmentSettingsObject& stored_settings, HTML::EnvironmentSettingsObject& relevant_settings, JS::Completion& completion)

7
Userland/Libraries/LibWeb/Crypto/SubtleCrypto.cpp
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@ -22,13 +22,14 @@ JS::Promise* SubtleCrypto::digest(String const& algorithm, JS::Handle<JS::Object
// 1. Let algorithm be the algorithm parameter passed to the digest() method.
// 2. Let data be the result of getting a copy of the bytes held by the data parameter passed to the digest() method.
auto data_buffer = Bindings::IDL::get_buffer_source_copy(*data.cell());
if (!data_buffer.has_value()) {
auto data_buffer_or_error = Bindings::IDL::get_buffer_source_copy(*data.cell());
if (data_buffer_or_error.is_error()) {
auto* error = wrap(wrapper()->global_object(), DOM::OperationError::create("Failed to copy bytes from ArrayBuffer"));
auto* promise = JS::Promise::create(global_object);
promise->reject(error);
return promise;
}
auto& data_buffer = data_buffer_or_error.value();
// 3. Let normalizedAlgorithm be the result of normalizing an algorithm, with alg set to algorithm and op set to "digest".
// FIXME: This is way more generic than it needs to be right now, so we simplify it.
@ -60,7 +61,7 @@ JS::Promise* SubtleCrypto::digest(String const& algorithm, JS::Handle<JS::Object
// 8. Let result be the result of performing the digest operation specified by normalizedAlgorithm using algorithm, with data as message.
::Crypto::Hash::Manager hash { hash_kind };
hash.update(*data_buffer);
hash.update(data_buffer);
auto digest = hash.digest();
auto result_buffer = ByteBuffer::copy(digest.immutable_data(), hash.digest_size());

8
Userland/Libraries/LibWeb/Encoding/TextDecoder.cpp
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@ -17,11 +17,11 @@ DOM::ExceptionOr<String> TextDecoder::decode(JS::Handle<JS::Object> const& input
{
// FIXME: Implement the streaming stuff.
auto data_buffer = Bindings::IDL::get_buffer_source_copy(*input.cell());
if (!data_buffer.has_value())
auto data_buffer_or_error = Bindings::IDL::get_buffer_source_copy(*input.cell());
if (data_buffer_or_error.is_error())
return DOM::OperationError::create("Failed to copy bytes from ArrayBuffer");
return m_decoder.to_utf8({ data_buffer->data(), data_buffer->size() });
auto& data_buffer = data_buffer_or_error.value();
return m_decoder.to_utf8({ data_buffer.data(), data_buffer.size() });
}
}

6
Userland/Libraries/LibWeb/FileAPI/Blob.cpp
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@ -71,10 +71,8 @@ ErrorOr<ByteBuffer> Blob::process_blob_parts(Vector<BlobPart> const& blob_parts)
},
// 2. If element is a BufferSource, get a copy of the bytes held by the buffer source, and append those bytes to bytes.
[&](JS::Handle<JS::Object> const& buffer_source) -> ErrorOr<void> {
auto data_buffer = Bindings::IDL::get_buffer_source_copy(*buffer_source.cell());
if (data_buffer.has_value())
return bytes.try_append(data_buffer->bytes());
return {};
auto data_buffer = TRY(Bindings::IDL::get_buffer_source_copy(*buffer_source.cell()));
return bytes.try_append(data_buffer.bytes());
},
// 3. If element is a Blob, append the bytes it represents to bytes.
[&](NonnullRefPtr<Blob> const& blob) -> ErrorOr<void> {