Affects Version/s: 5.0.0, 4.2.0
Fix Version/s: None
- 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)
`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.
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).