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Zip: Difference between revisions
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{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
! name | ! name | ||
! model | ! model | ||
! example | ! example | ||
! nested zips | ! nested zips | ||
! relative URLs pointing outside zip | ! relative URLs pointing outside zip | ||
|- | ! complexity | ||
! sub-scheme | ! notes | ||
| A URL is potentially a stack of URLs, the innermost URL represents the request URL and origin | |- | ||
| zip:http://example.org/test!image.jpg (last "!" as separator) | ! sub-scheme | ||
| zip:zip:/test!inner.zip!image.jpg | | A URL is potentially a stack of URLs, the innermost URL represents the request URL and origin | ||
| - (zip base URL is zip:/.../) | | zip:http://example.org/test!image.jpg (last "!" as separator) | ||
|- | | zip:zip:/test!inner.zip!image.jpg | ||
! | | - (zip base URL is zip:/.../) | ||
| A URL gains | | 1) URLs become a stack. 2) Zip URL needs its own URL object. 3) URL parser needs changing. | ||
| http://example.org/test%!image.jpg ("%!" as separator) | |- | ||
| /test%!inner.zip%!image.jpg | ! rowspan="2" | sub-path | ||
| √ (../otherimage.jpg) | | rowspan="2" | A URL gains sub-paths which are excluded from the request URL; origin computed per usual | ||
| | | http://example.org/test%!image.jpg ("%!" as separator) | ||
| /test%!inner.zip%!image.jpg | |||
| | | rowspan="2" | √ (../otherimage.jpg) | ||
| http://example.org/test | | rowspan="2" | 1) URL parser needs changing. | ||
| /test.zip | | generally does not work today | ||
| | |- | ||
|- | | http://example.org/test$sub=image.jpg ("$sub=" as separator) | ||
! fragment | | /test.zip$sub=inner.zip$sub=image.jpg | ||
| Fetch is passed fragment as well in case response is application/zip and data needs extracting | | possibility for compatibility-shims | ||
| http://example.org/test#image.jpg | |- | ||
| http://example.org/test#inner.zip!image.jpg (??) | ! fragment | ||
| - (zip base URL is zip:/.../) | | Fetch is passed fragment as well in case response is application/zip and data needs extracting. Resources from a zip have a zip URL as base. | ||
|} | | http://example.org/test#image.jpg | ||
| http://example.org/test#inner.zip!image.jpg (??) | |||
| - (zip base URL is zip:/.../) | |||
| 1) Inner and outer URL for resources. 2) Requires new scheme. 3) Fetch needs to be passed fragment. | |||
| | |||
|} | |||
While | While sub-path could support relative addressing outside of a zip, it's not clear whether this is desirable. | ||
Note that sub-path will also work for data URLs. | |||
== Fetch == | |||
We need to have a strategy around caching. | |||
* Just rely on HTTP (might evict early leading to lots of lost bandwidth) | |||
* Pin fetched URL (if zip) on a per document basis (done for images today, but not implemented at a level that makes generalizing this easy) | |||
* Pin resource as long as there are references to its data | |||
== Format == | == Format == | ||
Latest revision as of 14:58, 19 September 2013
URLs
| name | model | example | nested zips | relative URLs pointing outside zip | complexity | notes |
|---|---|---|---|---|---|---|
| sub-scheme | A URL is potentially a stack of URLs, the innermost URL represents the request URL and origin | zip:http://example.org/test!image.jpg (last "!" as separator) | zip:zip:/test!inner.zip!image.jpg | - (zip base URL is zip:/.../) | 1) URLs become a stack. 2) Zip URL needs its own URL object. 3) URL parser needs changing. | |
| sub-path | A URL gains sub-paths which are excluded from the request URL; origin computed per usual | http://example.org/test%!image.jpg ("%!" as separator) | /test%!inner.zip%!image.jpg | √ (../otherimage.jpg) | 1) URL parser needs changing. | generally does not work today |
| http://example.org/test$sub=image.jpg ("$sub=" as separator) | /test.zip$sub=inner.zip$sub=image.jpg | possibility for compatibility-shims | ||||
| fragment | Fetch is passed fragment as well in case response is application/zip and data needs extracting. Resources from a zip have a zip URL as base. | http://example.org/test#image.jpg | http://example.org/test#inner.zip!image.jpg (??) | - (zip base URL is zip:/.../) | 1) Inner and outer URL for resources. 2) Requires new scheme. 3) Fetch needs to be passed fragment. |
While sub-path could support relative addressing outside of a zip, it's not clear whether this is desirable.
Note that sub-path will also work for data URLs.
Fetch
We need to have a strategy around caching.
- Just rely on HTTP (might evict early leading to lots of lost bandwidth)
- Pin fetched URL (if zip) on a per document basis (done for images today, but not implemented at a level that makes generalizing this easy)
- Pin resource as long as there are references to its data
Format
For http://fetch.spec.whatwg.org/#zip-archives we need to document the zip format. Either through reference to the PKWARE text, or via a new standard (XKCD-style).
Gecko
baku https://mxr.mozilla.org/mozilla-central/source/dom/file/ArchiveZipEvent.cpp baku https://mxr.mozilla.org/mozilla-central/source/dom/file/ArchiveZipFile.cpp baku so the first file (line 120~) baku reads the file and creates ArchiveZipItem for each file contained in the archive baku ArhiceZipFile implements a nsIInputStream and what it does is the reading of the content. baku you have an ArchiveZipFile for each file.