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iso8859-1 vs windows-1252 #25851

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hashseed opened this issue Jan 31, 2019 · 11 comments
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iso8859-1 vs windows-1252 #25851

hashseed opened this issue Jan 31, 2019 · 11 comments
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buffer Issues and PRs related to the buffer subsystem. i18n-api Issues and PRs related to the i18n implementation. string_decoder Issues and PRs related to the string_decoder subsystem.

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@hashseed
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hashseed commented Jan 31, 2019 •
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This is somewhat related to #13722, but not quite.

Wikipedia contains the gist:

It is very common to mislabel Windows-1252 text with the charset label ISO-8859-1. [...] Most modern web browsers and e-mail clients treat the media type charset ISO-8859-1 as Windows-1252 to accommodate such mislabeling. This is now standard behavior in the HTML5 specification, which requires that documents advertised as ISO-8859-1 actually be parsed with the Windows-1252 encoding.

Chromium's ICU interprets "iso8859-1" to mean Windows-1252. Node.js does not. The WHATWG spec suggests Chromium's behavior to be correct.

The consequence of all of this is that when I build Node.js with Chromium's ICU, test/parallel/test-icu-transcode.js fails due to the character "€", which Windows-1252 includes, but ISO-8859-1 does not.

I propose:

  1. Change the test to pass for both interpretations.
  2. Conform to Chromium's behavior.
@hashseed
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@srl295

@addaleax addaleax added the i18n-api Issues and PRs related to the i18n implementation. label Jan 31, 2019
@joyeecheung joyeecheung added buffer Issues and PRs related to the buffer subsystem. string_decoder Issues and PRs related to the string_decoder subsystem. labels Feb 1, 2019
@joyeecheung
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The consequence of all of this is that when I build Node.js with Chromium's ICU, test/parallel/test-icu-transcode.js fails due to the character "€"

From a glance of the test I couldn't see how the encoding differences would come into play if the test itself was decoded properly. Was the test file stored in Windows-1252? And then got interpreted as utf8 by the CJS loader?

@hashseed
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hashseed commented Feb 1, 2019

The test loads the euro sign as utf8 and converts to latin1. With iso8859-1 it doesn't encode so it gets replaced by "?".

@richardlau
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Is this affected by full-icu?

@richardlau
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Also #13722.

@hashseed
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hashseed commented Feb 1, 2019

I can check again, but iirc full icu doesn't fix this issue. If it did, the full icu build would fail the above mentioned test.

@hashseed
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hashseed commented Feb 1, 2019

Same actually also applies to "ascii". According to WHATWG it is to be interpreted as Windows-1252 as well.

@hashseed hashseed mentioned this issue Feb 1, 2019
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@mhdawson
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mhdawson commented Feb 1, 2019 •
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@srl295 as our ICU expert.

@TimothyGu
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We have a dedicated WHATWG text encoder/decoder util.TextDecoder and util.TextEncoder, which should strictly follow the semantics of the Encoding Standard. buffer.transcode() should indeed just fall back on whatever the linked ICU does. I believe #25866 is a good change because of this.

danbev pushed a commit that referenced this issue Feb 5, 2019
@hashseed @danbev
test: relax expectations in test-icu-transcode
793c630 
Chromium's ICU considers "latin1" and "ascii" to mean Windows-1252,
which is consistent with
[WHATWG spec](https://encoding.spec.whatwg.org/#names-and-labels). If
linked against Chromium's ICU, Node.js therefore fails
`test/parallel/test-icu-transcode`.

PR-URL: #25866
Refs: #25851
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
@hashseed
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hashseed commented Feb 5, 2019

Test fix landed.

@hashseed hashseed closed this as completed Feb 5, 2019
addaleax pushed a commit that referenced this issue Feb 6, 2019
@hashseed @addaleax
test: relax expectations in test-icu-transcode
ee3165d 
Chromium's ICU considers "latin1" and "ascii" to mean Windows-1252,
which is consistent with
[WHATWG spec](https://encoding.spec.whatwg.org/#names-and-labels). If
linked against Chromium's ICU, Node.js therefore fails
`test/parallel/test-icu-transcode`.

PR-URL: #25866
Refs: #25851
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
@srl295
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srl295 commented Feb 14, 2019

sorry to miss this, but the fix looks good.

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@srl295 @addaleax @TimothyGu @hashseed @joyeecheung @richardlau @mhdawson