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From Lorin Beer <>
Subject Re: Writing binary data to disk
Date Thu, 07 Mar 2013 02:40:37 GMT

the Cordova docs on FileWriter state that the data sent is written as a
UTF-8 string
The user doesn't want to specify a hex or binary encoded string, and have
that written as binary data on the native side. As it sits now, providing a
hex string would write a unicode string of hex characters.

In order to to have a hex or binary string actually be written as binary,
we'd need to:
1. pass an argument which explicitly sets the write mode, either to
FileWriter constructor or FileWriter.write
2. set a state on FileWriter stating that the data string it receives is to
be written in binary mode

neither of these two options is explicitly part of the W3C spec on

On Wed, Mar 6, 2013 at 5:47 PM, Michal Mocny <> wrote:

> We've added a way to send binary data across the android and ios bridge
> (ArrayBuffers are a supported argument/message type).
> If you wanted to write a simple plugin to support writing binary data to
> disk, it should be quite easy.
> Note: There are various limitations to the current way we send
> ArrayBuffers, such as being limited to very small sizes per call.  We are
> soon going to be working on improvements here, expect JIRA issues and tests
> to come soon.
> -Michal
> On Wed, Mar 6, 2013 at 7:02 PM, Lorin Beer <>
> wrote:
> > Hey folks,
> >
> > I was going through the unassigned jira issues, and came across
> > CB-2406<>
> >  ((, which requests a
> method
> > to write binary data to disk. Before commenting to the user on the
> issue, I
> > thought I'd get some feedback from you guys.
> >
> > My feeling is that while there might be a use case or two, specifying a
> > binary write mode doesn't fit in with the W3C FileWriter
> > api<>,
> > and shouldn't be a change to the File API of cordova. As such, the issue
> > should probably be closed.
> >
> > The way in which the user would/should accomplish this kind of
> > functionality would be to create a very simple plugin which takes a hex
> > string and uses the native file writer api to open in binary mode.
> >
> > Before commenting to the user on the issue, I thought I'd get some
> feedback
> > from you guys.
> >
> >
> > - Lorin
> >

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