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LibWeb: Fix utf16-be check in HTMLEncodingDetection

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The utf-16be check mistakenly skipped index 3, so was not checking the
correct bytes. This meant UTF16-BE files could fail to decode.
This commit is contained in:
MacDue 2024-01-05 00:49:08 +00:00 • committed by Andreas Kling
parent 5e973fca0b
commit fc41c282ec
3 changed files with 24 additions and 2 deletions
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20
Tests/LibWeb/Layout/expected/utf-16-be-xhtml-file-should-decode-correctly.txt Normal file
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@ -0,0 +1,20 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x41.46875 [BFC] children: not-inline
BlockContainer <body> at (8,16) content-size 784x17.46875 children: not-inline
BlockContainer <(anonymous)> at (8,16) content-size 784x0 children: inline
TextNode <#text>
BlockContainer <p> at (8,16) content-size 784x17.46875 children: inline
line 0 width: 29.21875, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 1, length: 15, rect: [8,16 29.21875x17.46875]
"好啦朋友們"
TextNode <#text>
BlockContainer <(anonymous)> at (8,49.46875) content-size 784x0 children: inline
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x41.46875] overflow: [0,0 800x49.46875]
PaintableWithLines (BlockContainer<BODY>) [8,16 784x17.46875] overflow: [8,16 784x33.46875]
PaintableWithLines (BlockContainer(anonymous)) [8,16 784x0]
PaintableWithLines (BlockContainer<P>) [8,16 784x17.46875]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer(anonymous)) [8,49.46875 784x0]

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Tests/LibWeb/Layout/input/utf-16-be-xhtml-file-should-decode-correctly.html Normal file
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6
Userland/Libraries/LibWeb/HTML/Parser/HTMLEncodingDetection.cpp
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@ -251,10 +251,12 @@ Optional<ByteString> run_prescan_byte_stream_algorithm(DOM::Document& document,
// https://html.spec.whatwg.org/multipage/parsing.html#prescan-a-byte-stream-to-determine-its-encoding
// Detects '<?x'
if (!prescan_should_abort(input, 6)) {
if (!prescan_should_abort(input, 5)) {
// A sequence of bytes starting with: 0x3C, 0x0, 0x3F, 0x0, 0x78, 0x0
if (input[0] == 0x3C && input[1] == 0x00 && input[2] == 0x3F && input[3] == 0x00 && input[4] == 0x78 && input[5] == 0x00)
return "utf-16le";
if (input[0] == 0x00 && input[1] == 0x3C && input[2] == 0x00 && input[4] == 0x3F && input[5] == 0x00 && input[6] == 0x78)
// A sequence of bytes starting with: 0x0, 0x3C, 0x0, 0x3F, 0x0, 0x78
if (input[0] == 0x00 && input[1] == 0x3C && input[2] == 0x00 && input[3] == 0x3F && input[4] == 0x00 && input[5] == 0x78)
return "utf-16be";
}