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Firefox OS/MappedArrayBuffer: Difference between revisions
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== How to use it? == | == How to use it? == | ||
: You need to make the target files uncompressed and aligned when building a packaged app. To do this, put a configuration file "metadata.json" in the gaia app directory to specify memory-mapped files. | |||
: Below is an example of "metadata.json" for keyboard app: | |||
{ | |||
"external": false, | |||
"zip": { | |||
"mmap_files": [ | |||
"js/imes/latin/dictionaries/en_us.dict", | |||
"js/imes/jszhuyin/data/database.data" | |||
] | |||
} | |||
} | |||
: After that, the files specified in "mmap_files" will be uncompressed and aligned to 4096 bytes in the zip package. | |||
$ unzip -v gaia/profile/webapps/keyboard.gaiamobile.org/application.zip | grep Stored | |||
1451390 Stored 1451390 0% 1970-01-01 08:00 3d22f787 js/imes/latin/dictionaries/en_us.dict | |||
4541832 Stored 4541832 0% 1970-01-01 08:00 426a7f8e js/imes/jszhuyin/data/database.data | |||
* For more information, please see: | |||
** https://bugzilla.mozilla.org/show_bug.cgi?id=957497 | |||
** https://bugzilla.mozilla.org/show_bug.cgi?id=959047 | |||
Note: The current approach first makes specified files uncompressed, then re-organize the zip package to make uncompressed files to be 4096 bytes alignment. This could introduce some overhead on zip package size, because some uncompressed files may not want to be read as memory-mapped, which need not and should not be made aligned. | |||
: There is a follow up to align for individual files in the zip package https://bugzilla.mozilla.org/show_bug.cgi?id=961622. | |||
== OOP support == | == OOP support == | ||