Intent to Ship: "deflate-raw" on compression and decompression streams

Yutaka Hirano

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May 6, 2022, 8:10:55 AM5/6/22

to blink-dev

Contact emails

yhi...@chromium.org

Explainer

None

Specification

https://wicg.github.io/compression/

https://github.com/wicg/compression/pull/43 (spec PR)

https://chromium-review.googlesource.com/c/chromium/src/+/3586945 (impl and tests)

Summary

Add a new compression format, "deflate-raw", to give web developers access to the raw deflate stream without any headers or footers. This is needed, for example, to read/write zip files.

Blink component

Blink>Network>StreamsAPI

TAG review

This is subtle enough for a separate TAG review.

TAG review status

Not applicable

Risks

Interoperability and Compatibility

This is a new addition and doesn’t change any existing behaviors.

Gecko: No signal

(See the bottom of https://github.com/mozilla/standards-positions/issues/207)

WebKit: No signal

(See https://lists.webkit.org/pipermail/webkit-dev/2022-May/032213.html)

Web developers: Positive

https://github.com/wicg/compression/issues/25

Google Sheets

Google sheets team uses zipping for conversion (client side) of google sheet into different formats such as xlsx. Browser native compression/decompression stream apis have much better performance than using any js library for zipping.

With support for “deflate-raw” format, we are able to use compression/decompression stream apis for compression of files during zipping in a much simpler way compared to “gzip”, “deflate” format which required workarounds on our side.

Other signals:

WebView application risks

None.

Debuggability

None

Is this feature fully tested by web-platform-tests?

Yes

Flag name

Requires code in //chrome?

False

Tracking bug

https://crbug.com/1271220

Estimated milestones

103

Anticipated spec changes

None

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5172771293233152

Links to previous Intent discussions

Intent to prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CABihn6GYcF5VsvfgEDpYL0rCvxQV9phxwFtJ-FxbTEbqPtJxbg%40mail.gmail.com

This intent message was generated by Chrome Platform Status.

Mike Taylor

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May 6, 2022, 7:24:35 PM5/6/22

to Yutaka Hirano, blink-dev

On 5/6/22 8:10 AM, Yutaka Hirano wrote:

Contact emails

yhi...@chromium.org

Explainer

None

Specification

https://wicg.github.io/compression/

https://github.com/wicg/compression/pull/43 (spec PR)

https://chromium-review.googlesource.com/c/chromium/src/+/3586945 (impl and tests)

Summary

Add a new compression format, "deflate-raw", to give web developers access to the raw deflate stream without any headers or footers. This is needed, for example, to read/write zip files.

Blink component

Blink>Network>StreamsAPI

TAG review

This is subtle enough for a separate TAG review.

Do you intend to file one? Or is the above missing a "not"?

TAG review status

Not applicable

Risks

Interoperability and Compatibility

This is a new addition and doesn’t change any existing behaviors.

Gecko: No signal

(See the bottom of https://github.com/mozilla/standards-positions/issues/207)

I pinged that thread to ask if they would prefer us to open a new issue - Compression Streams was marked as "worth prototyping", but that was before "deflaw-raw" existed in the spec.

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Yutaka Hirano

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May 8, 2022, 10:46:10 PM5/8/22

to Mike Taylor, blink-dev

On Sat, May 7, 2022 at 8:24 AM Mike Taylor <mike...@chromium.org> wrote:

On 5/6/22 8:10 AM, Yutaka Hirano wrote:

Contact emails

yhi...@chromium.org

Explainer

None

Specification

https://wicg.github.io/compression/

https://github.com/wicg/compression/pull/43 (spec PR)

https://chromium-review.googlesource.com/c/chromium/src/+/3586945 (impl and tests)

Summary

Add a new compression format, "deflate-raw", to give web developers access to the raw deflate stream without any headers or footers. This is needed, for example, to read/write zip files.

Blink component

Blink>Network>StreamsAPI

TAG review

This is subtle enough for a separate TAG review.

Do you intend to file one? Or is the above missing a "not"?

Sorry for the unclearness, I wanted to say that we don't need a TAG review for this feature because this is a very small feature.

Mike West

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May 11, 2022, 1:35:07 AM5/11/22

to Yutaka Hirano, Mike Taylor, blink-dev

LGTM1. This seems like a logical extension of the existing compression streams mechanism that was discussed at the time, delayed only due to prioritization, not design considerations. It makes a common use case simpler for developers, and does so in a way that's consistent with the rest of the API. Good luck getting it out the door!

-mike

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CABihn6F3bEt9b0U2BGgPrfs%2BetdtfYj-BQuKvHG%3D-CmDELyt-g%40mail.gmail.com.

Yoav Weiss

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May 11, 2022, 2:47:44 AM5/11/22

to Mike West, Yutaka Hirano, Mike Taylor, blink-dev

LGTM2

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAKXHy%3DfpdyXYXpac_WqMif3E6uohvqmJ5kBHOqKTbuBs_HzdrA%40mail.gmail.com.

TAMURA, Kent

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May 11, 2022, 4:07:35 AM5/11/22

to Yutaka Hirano, blink-dev, Mike West, Yoav Weiss, Mike Taylor

LGTM3

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfXYAMYKdvaHDg2vYxb3F5zWocTdE9Fm992z6UQ_SBCfmw%40mail.gmail.com.