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hixie: Fix the UTF-8 decoder error handling to handle a few errors I'd missed, including in particular surrogate halves. This may be a mistake; if I'm forgetting something please let me know so I can fix it. (e.g. did we decide not to catch surrogates or something?) (whatwg r5942)

From: poot <cvsmail@w3.org>
Date: Thu, 03 Mar 2011 21:58:09 -0500
To: public-html-diffs@w3.org
Message-Id: <E1PvLDU-0002kx-TZ@jay.w3.org>
hixie: Fix the UTF-8 decoder error handling to handle a few errors I'd
missed, including in particular surrogate halves. This may be a mistake;
if I'm forgetting something please let me know so I can fix it. (e.g.
did we decide not to catch surrogates or something?) (whatwg r5942)

http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.4782&r2=1.4783&f=h
http://html5.org/tools/web-apps-tracker?from=5941&to=5942

===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.4782
retrieving revision 1.4783
diff -u -d -r1.4782 -r1.4783
--- Overview.html	4 Mar 2011 02:10:50 -0000	1.4782
+++ Overview.html	4 Mar 2011 02:56:55 -0000	1.4783
@@ -3230,39 +3230,47 @@
 
   <dl class="switch"><dt>One byte in the range FE to FF</dt>
 
+
    <dt><a href="#overlong-form" title="overlong form">Overlong forms</a> (e.g. F0 80 80 A0)</dt>
 
-   <dt>One byte in the range C0 to C1, followed by one byte in the range 80 to BF</dt>
+   <dt>One byte in the range C0 to C1, followed by one byte in the range 80 to BF</dt> <!-- overlong ASCII (redundant with the previous line, really, but worth calling out separately as it's especially dangerous to miss this case) -->
+
 
    <dt>One byte in the range F0 to F4, followed by three bytes in the range 80 to BF that represent a code point above U+10FFFF</dt>
 
-   <dt>One byte in the range F5 to F7, followed by three bytes in the range 80 to BF</dt>
+   <dt>One byte in the range F5 to F7, followed by three bytes in the range 80 to BF</dt> <!-- above U+10FFFF -->
 
-   <dt>One byte in the range F8 to FB, followed by four bytes in the range 80 to BF</dt>
+   <dt>One byte in the range F8 to FB, followed by four bytes in the range 80 to BF</dt> <!-- above U+10FFFF -->
 
-   <dt>One byte in the range FC to FD, followed by five bytes in the range 80 to BF</dt>
+   <dt>One byte in the range FC to FD, followed by five bytes in the range 80 to BF</dt> <!-- above U+10FFFF -->
 
-   <dt>One byte in the range E0 to FD, followed by a byte in the range 80 to BF, not followed by a byte in the range 80 to BF</dt>
 
-   <dt>One byte in the range F0 to FD, followed by two bytes in the range 80 to BF, not followed by a byte in the range 80 to BF</dt>
+   <dt>One byte in the range C0 to FD that is not followed by a byte in the range 80 to BF</dt> <!-- too short -->
 
-   <dt>One byte in the range F8 to FD, followed by three bytes in the range 80 to BF, not followed by a byte in the range 80 to BF</dt>
+   <dt>One byte in the range E0 to FD, followed by a byte in the range 80 to BF that is not followed by a byte in the range 80 to BF</dt> <!-- too short -->
 
-   <dt>One byte in the range FC to FD, followed by four bytes in the range 80 to BF, not followed by a byte in the range 80 to BF</dt>
+   <dt>One byte in the range F0 to FD, followed by two bytes in the range 80 to BF, the last of which is not followed by a byte in the range 80 to BF</dt> <!-- too short -->
 
+   <dt>One byte in the range F8 to FD, followed by three bytes in the range 80 to BF, the last of which is not followed by a byte in the range 80 to BF</dt> <!-- too short -->
 
-   <dd>The whole sequence must be replaced by a single U+FFFD
+   <dt>One byte in the range FC to FD, followed by four bytes in the range 80 to BF, the last of which is not followed by a byte in the range 80 to BF</dt> <!-- too short -->
+
+
+   <dt>Any byte sequence that represents a code point in the range U+D800 to U+DFFF</dt> <!-- surrogate halves -->
+
+
+   <dd>The whole matched sequence must be replaced by a single U+FFFD
    REPLACEMENT CHARACTER.</dd>
 
 
    <dt>One byte in the range 80 to BF not preceded by a byte in the range 80 to FD</dt>
 
-   <dt>A sequence of bytes in the range 80 to BF that does not follow a byte in the range C0 to FD</dt>
+   <dt>One byte in the range 80 to BF preceded by a byte that is part of a complete UTF-8 sequence that does not include this byte</dt>
 
-   <dt>One byte in the range C0 to FD not followed by a byte in the range 80 to BF</dt>
+   <dt>One byte in the range 80 to BF preceded by a byte that is part of a sequence that has been replaced by a U+FFFD REPLACEMENT CHARACTER, either alone or as port of a sequence</dt>
 
+   <dd>Each such byte must be replaced with a U+FFFD REPLACEMENT CHARACTER.</dd>
 
-   <dd>Each byte must be replaced with a U+FFFD REPLACEMENT CHARACTER.</dd>
 
   </dl><p>For the purposes of the above requirements, an <dfn id="overlong-form">overlong
   form</dfn> in UTF-8 is a sequence that encodes a code point using
Received on Friday, 4 March 2011 02:58:10 GMT

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