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annevk merged 4 commits into from
Apr 24, 2025
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Properly create Uint8Array objects #350

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Properly create Uint8Array objects
annevk Apr 23, 2025
430984d
Update encoding.bs
annevk Apr 23, 2025
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Update encoding.bs
annevk Apr 24, 2025
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annevk Apr 24, 2025
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72 changes: 47 additions & 25 deletions encoding.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,12 @@ Translate IDs: dictdef-textdecoderoptions textdecoderoptions,dictdef-textdecodeo
}
</pre>

<pre class=anchors>
urlPrefix: https://tc39.es/ecma262/#; spec: ECMA-262;
type: dfn
text: realm; url: realm
</pre>

<link rel=stylesheet href=visualization-colors.css>


Expand Down Expand Up @@ -234,8 +240,8 @@ items, in the given order, before the first item in the queue.
<a>byte sequence</a> <var>input</var> into an <a for=/>I/O queue</a>, run these steps:

<ol>
<li><p>Assert: if <var>input</var> is a <a for=/>list</a>, then it does not <a for=list>contain</a>
<a>end-of-queue</a>.
<li><p><a for=/>Assert</a>: <var>input</var> is not a <a for=/>list</a> or it does not
<a for=list>contain</a> <a>end-of-queue</a>.

<li><p>Return an <a for=/>I/O queue</a> containing the <a for=list>items</a> in <var>input</var>,
in order, followed by <a>end-of-queue</a>.
Expand All @@ -259,6 +265,21 @@ algorithms, as detailed in [[#implementation-considerations]].
0x10000 + ((<var>leading</var> &minus; 0xD800) &lt;&lt; 10) + (<var>trailing</var> &minus; 0xDC00).
</div>

<hr>

<div algorithm>
<p>To <dfn>create a <code>Uint8Array</code> object</dfn>, given an <a for=/>I/O queue</a>
<var>ioQueue</var> and a <a for=/>realm</a> <var>realm</var>:

<ol>
<li><p>Let <var>bytes</var> be the result of <a for="from I/O queue">converting</a>
<var>ioQueue</var> into a byte sequence.

<li><p>Return the result of <a for=ArrayBufferView>creating</a> a {{Uint8Array}} object from
<var>bytes</var> in <var>realm</var>.
</ol>
</div>



<h2 id=encodings>Encodings</h2>
Expand Down Expand Up @@ -332,14 +353,14 @@ given an <a for=list>item</a> <var>item</var>, <a for=/>encoding</a>'s <a for=/>
<a for=/>I/O queue</a> <var>output</var>, and <a for=/>error mode</a> <var>mode</var>:

<ol>
<li><p>Assert: if <var>encoderDecoder</var> is an <a for=/>encoder</a> instance, <var>mode</var> is
not "<code>replacement</code>".
<li><p><a for=/>Assert</a>: if <var>encoderDecoder</var> is an <a for=/>encoder</a> instance,
<var>mode</var> is not "<code>replacement</code>".

<li><p>Assert: if <var>encoderDecoder</var> is a <a for=/>decoder</a> instance, <var>mode</var> is
not "<code>html</code>".
<li><p><a for=/>Assert</a>: if <var>encoderDecoder</var> is a <a for=/>decoder</a> instance,
<var>mode</var> is not "<code>html</code>".

<li><p>Assert: if <var>encoderDecoder</var> is an <a for=/>encoder</a> instance, <var>item</var> is
not a <a>surrogate</a>.
<li><p><a for=/>Assert</a>: if <var>encoderDecoder</var> is an <a for=/>encoder</a> instance,
<var>item</var> is not a <a>surrogate</a>.

<li><p>Let <var>result</var> be the result of running <var>encoderDecoder</var>'s <a>handler</a> on
<var>input</var> and <var>item</var>.
Expand All @@ -358,8 +379,8 @@ given an <a for=list>item</a> <var>item</var>, <a for=/>encoding</a>'s <a for=/>
<p>Otherwise, if <var>result</var> is one or more <a for=list>items</a>:

<ol>
<li><p>Assert: if <var>encoderDecoder</var> is a <a for=/>decoder</a> instance, <var>result</var>
does not contain any <a>surrogates</a>.
<li><p><a for=/>Assert</a>: if <var>encoderDecoder</var> is a <a for=/>decoder</a> instance,
<var>result</var> does not contain any <a>surrogates</a>.

<li><p><a>Push</a> <var>result</var> to <var>output</var>.
</ol>
Expand Down Expand Up @@ -1216,7 +1237,7 @@ is safe as it never triggers <a>errors</a>. [[HTML]]
<a for=/>encoding</a> <var>encoding</var>:

<ol>
<li><p>Assert: <var>encoding</var> is not <a>replacement</a> or <a>UTF-16BE/LE</a>.
<li><p><a for=/>Assert</a>: <var>encoding</var> is not <a>replacement</a> or <a>UTF-16BE/LE</a>.

<li><p>Return an instance of <var>encoding</var>'s <a for=/>encoder</a>.
</ol>
Expand Down Expand Up @@ -1660,14 +1681,13 @@ constructor steps are to do nothing.
"<code>fatal</code>".

<li>
<p>Assert: <var>result</var> is not an <a>error</a>.
<p><a for=/>Assert</a>: <var>result</var> is not an <a>error</a>.

<p class=note>The <a>UTF-8 encoder</a> cannot return <a>error</a>.

<li><p>If <var>result</var> is <a>finished</a>, then <a for="from I/O queue">convert</a>
<var>output</var> into a byte sequence and return a {{Uint8Array}} object wrapping an
{{ArrayBuffer}} containing <var>output</var>.
<!-- XXX https://www.w3.org/Bugs/Public/show_bug.cgi?id=26966 -->
<li><p>If <var>result</var> is <a>finished</a>, then return the result of
<a>creating a <code>Uint8Array</code> object</a> given <var>output</var> and <a>this</a>'s
<a>relevant realm</a>.
</ol>
</ol>
</div>
Expand Down Expand Up @@ -1898,8 +1918,9 @@ constructor steps are:
<li><p>Let <var>outputChunk</var> be the result of running <a>serialize I/O queue</a> with
<var>decoder</var> and <var>output</var>.

<li><p>If <var>outputChunk</var> is non-empty, then <a for=TransformStream>enqueue</a>
<var>outputChunk</var> in <var>decoder</var>'s <a for=GenericTransformStream>transform</a>.
<li><p>If <var>outputChunk</var> is not the empty string, then
<a for=TransformStream>enqueue</a> <var>outputChunk</var> in <var>decoder</var>'s
<a for=GenericTransformStream>transform</a>.

<li><p>Return.
</ol>
Expand Down Expand Up @@ -1942,8 +1963,9 @@ steps:
<li><p>Let <var>outputChunk</var> be the result of running <a>serialize I/O queue</a> with
<var>decoder</var> and <var>output</var>.

<li><p>If <var>outputChunk</var> is non-empty, then <a for=TransformStream>enqueue</a>
<var>outputChunk</var> in <var>decoder</var>'s <a for=GenericTransformStream>transform</a>.
<li><p>If <var>outputChunk</var> is not the empty string, then
<a for=TransformStream>enqueue</a> <var>outputChunk</var> in <var>decoder</var>'s
<a for=GenericTransformStream>transform</a>.

<li><p>Return.
</ol>
Expand Down Expand Up @@ -2067,11 +2089,11 @@ constructor steps are:
<li><p><a for="from I/O queue">Convert</a> <var>output</var> into a byte sequence.

<li>
<p>If <var>output</var> is non-empty:
<p>If <var>output</var> <a for=list>is not empty</a>:

<ol>
<li><p>Let <var>chunk</var> be a {{Uint8Array}} object wrapping an {{ArrayBuffer}} containing
<var>output</var>.
<li><p>Let <var>chunk</var> be the result of <a>creating a <code>Uint8Array</code> object</a>
given <var>output</var> and <var>encoder</var>'s <a>relevant realm</a>.

<li><p><a for=TransformStream>Enqueue</a> <var>chunk</var> into <var>encoder</var>'s
<a for=GenericTransformStream>transform</a>.
Expand Down Expand Up @@ -2136,8 +2158,8 @@ that are split between strings. [[!INFRA]]

<ol>
<li>
<p>Let <var>chunk</var> be a {{Uint8Array}} object wrapping an {{ArrayBuffer}} containing
0xEF 0xBF 0xBD.
<p>Let <var>chunk</var> be the result of <a>creating a <code>Uint8Array</code> object</a> given
« 0xEF, 0xBF, 0xBD » and <var>encoder</var>'s <a>relevant realm</a>.

<p class=note>This is U+FFFD (�) in <a>UTF-8</a> bytes.

Expand Down