Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/Encoding/TextEncoder.cpp

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/TypedArray.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/Bindings/TextEncoderPrototype.h>
+#include <LibWeb/Encoding/TextEncoder.h>
+#include <LibWeb/WebIDL/ExceptionOr.h>
+
+namespace Web::Encoding {
+
+JS_DEFINE_ALLOCATOR(TextEncoder);
+
+WebIDL::ExceptionOr<JS::NonnullGCPtr<TextEncoder>> TextEncoder::construct_impl(JS::Realm& realm)
+{
+    return realm.heap().allocate<TextEncoder>(realm, realm);
+}
+
+TextEncoder::TextEncoder(JS::Realm& realm)
+    : PlatformObject(realm)
+{
+}
+
+TextEncoder::~TextEncoder() = default;
+
+void TextEncoder::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(TextEncoder);
+}
+
+// https://encoding.spec.whatwg.org/#dom-textencoder-encode
+JS::NonnullGCPtr<JS::Uint8Array> TextEncoder::encode(String const& input) const
+{
+    // NOTE: The AK::String is always UTF-8, so most of these steps are no-ops.
+    // 1. Convert input to an I/O queue of scalar values.
+    // 2. Let output be the I/O queue of bytes « end-of-queue ».
+    // 3. While true:
+    //     1. Let item be the result of reading from input.
+    //     2. Let result be the result of processing an item with item, an instance of the UTF-8 encoder, input, output, and "fatal".
+    //     3. Assert: result is not an error.
+    //     4. If result is finished, then convert output into a byte sequence and return a Uint8Array object wrapping an ArrayBuffer containing output.
+
+    auto byte_buffer = MUST(ByteBuffer::copy(input.bytes()));
+    auto array_length = byte_buffer.size();
+    auto array_buffer = JS::ArrayBuffer::create(realm(), move(byte_buffer));
+    return JS::Uint8Array::create(realm(), array_length, *array_buffer);
+}
+
+// https://encoding.spec.whatwg.org/#dom-textencoder-encodeinto
+TextEncoderEncodeIntoResult TextEncoder::encode_into(String const& source, JS::Handle<WebIDL::BufferSource> const& destination) const
+{
+    auto& data = destination->viewed_array_buffer()->buffer();
+
+    // 1. Let read be 0.
+    WebIDL::UnsignedLongLong read = 0;
+    // 2. Let written be 0.
+    WebIDL::UnsignedLongLong written = 0;
+
+    // NOTE: The AK::String is always UTF-8, so most of these steps are no-ops.
+    // 3. Let encoder be an instance of the UTF-8 encoder.
+    // 4. Let unused be the I/O queue of scalar values « end-of-queue ».
+    // 5. Convert source to an I/O queue of scalar values.
+    auto code_points = source.code_points();
+    auto it = code_points.begin();
+
+    // 6. While true:
+    while (true) {
+        // 6.1. Let item be the result of reading from source.
+        // 6.2. Let result be the result of running encoder’s handler on unused and item.
+        // 6.3. If result is finished, then break.
+        if (it.done())
+            break;
+        auto item = *it;
+        auto result = it.underlying_code_point_bytes();
+
+        // 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()) {
+            // 6.4.1.1. If item is greater than U+FFFF, then increment read by 2.
+            if (item > 0xffff) {
+                read += 2;
+            }
+            // 6.4.1.2. Otherwise, increment read by 1.
+            else {
+                read++;
+            }
+
+            // 6.4.1.3. Write the bytes in result into destination, with startingOffset set to written.
+            // 6.4.1.4. Increment written by the number of bytes in result.
+            for (auto byte : result)
+                data[written++] = byte;
+        }
+        // 6.4.2. Otherwise, break.
+        else {
+            break;
+        }
+
+        ++it;
+    }
+
+    // 7. Return «[ "read" → read, "written" → written ]».
+    return { read, written };
+}
+
+// https://encoding.spec.whatwg.org/#dom-textencoder-encoding
+FlyString const& TextEncoder::encoding()
+{
+    static FlyString const encoding = "utf-8"_fly_string;
+    return encoding;
+}
+
+}