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gb18030 decoder: unwind from fourth byte when it's not a digit #111

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Merged
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May 15, 2017
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gb18030 decoder: unwind from fourth byte when it's not a digit #111

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gb18030 decoder: unwind from fourth byte when it's not a digit
annevk May 11, 2017
951c471
rewrite
annevk May 11, 2017
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27 changes: 13 additions & 14 deletions encoding.bs
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Expand Up @@ -1625,25 +1625,24 @@ consumers of content generated with <a>GBK</a>'s <a for=/>encoder</a>.
<p>If <a>gb18030 third</a> is not 0x00, then:

<ol>
<li><p>Let <var>code point</var> be null.
<li>
<p>If <var>byte</var> is not in the range 0x30 to 0x39, inclusive, then:

<li><p>If <var>byte</var> is in the range 0x30 to 0x39, inclusive, set
<var>code point</var> to the
<a>index gb18030 ranges code point</a> for
<ol>
<li><p><a>Prepend</a> <a>gb18030 second</a>, <a>gb18030 third</a>, and <var>byte</var> to
<var>stream</var>.

<li><p>Set <a>gb18030 first</a>, <a>gb18030 second</a>, and <a>gb18030 third</a> to 0x00.

<li><p>Return <a>error</a>.
</ol>

<li><p>Let <var>code point</var> be the <a>index gb18030 ranges code point</a> for
((<a>gb18030 first</a> &minus; 0x81) × (10 × 126 × 10)) +
((<a>gb18030 second</a> &minus; 0x30) × (10 × 126)) +
((<a>gb18030 third</a> &minus; 0x81) × 10) + <var>byte</var> &minus; 0x30.

<li><p>Let <var>buffer</var> be a byte sequence consisting of
<a>gb18030 second</a>, <a>gb18030 third</a>, and <var>byte</var>, in
order.

<li><p>Set <a>gb18030 first</a>, <a>gb18030 second</a>, and
<a>gb18030 third</a> to 0x00.

<li><p>If <var>code point</var> is null,
<a>prepend</a> <var>buffer</var> to
<var>stream</var> and return <a>error</a>.
<li><p>If <var>code point</var> is null, return <a>error</a>.

<li><p>Return a code point whose value is <var>code point</var>.
</ol>
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