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https://issues.apache.org/jira/browse/CB-13570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16587676#comment-16587676
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Timothy Hambourger commented on CB-13570:
-----------------------------------------
OK, submitted (clearly). Our fork with fixes is at
[https://github.com/mi-corporation/cordova-plugin-file|https://github.com/mi-corporation/cordova-plugin-file.]
> FileReader#readAsText fails with multi-byte UTF-8 characters
> ------------------------------------------------------------
>
> Key: CB-13570
> URL: https://issues.apache.org/jira/browse/CB-13570
> Project: Apache Cordova
> Issue Type: Bug
> Components: cordova-plugin-file
> Affects Versions: 5.0.0, 4.2.0
> Environment: Tested on:
> * iOS 10.2
> * cordova-ios 4.3.0
> * UIWebView (not WKWebView)
> * cordova 6.4.0
> * cordova-plugin-file 4.2.0 and 5.0.0
> (Slightly old cordova version, but the issue seems to be in the plugin)
> Reporter: Ralf Kistner
> Priority: Major
>
> `FileReader#readAsText` reads the file in chunks of 256KB. If the file
> contains a multi-byte UTF-8 character that is split into two separate chunks,
> reading fails with an encoding error (ENCODING_ERR: 5).
> For many apps this is not an issue. However, if I file is larger than 256KB
> and contains many multi-byte characters, this is likely to happen.
> I have not experienced this issue on Android yet.
> Code that demonstrates the issue:
> https://gist.github.com/anonymous/0fdc1ec212be1e29309820477257a0c3
> In the example, the reading will split the '\u0153' character into '...\x01'
> and '\x53', which fails to decode in UTF-8.
> A workaround is to use readAsArrayBuffer instead, and do the decoding in
> JavaScript. However, the decoding can be quite slow on iOS where a native
> TextDecoder is not available.
> One solution would be to make the chunk sizes semi-flexible, to ensure that
> it ends on a character boundary (make the chunk larger until decoding
> succeeds).
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