Reader.js

Reader.js is a tiny interface to unify three primary methods of reading data with JavaScript: AJAX requests, local disk access (NodeJS) and the HTML5 File API.

Example

var rd = new Reader(Reader.OPEN_FILE);
rd.open(file, function() {
    // file has now been opened and is ready for reading
    rd.read(1024, function(err, data) {
        // data is now an ArrayBuffer
    });
});

Here, data will be an ArrayBuffer containing the first 1024 bytes from the specified file (which is a File instance).

The following types exist:

• Reader.OPEN_FILE Treat the specified object as a File instance (HTML5 File API)
• Reader.OPEN_URI Read the given URI by HTTP request
• Reader.OPEN_LOCAL Read the given path locally, works only in NodeJS

The default is Reader.OPEN_URI.

Methods

• open(file, callback) Open the specified file and call the callback on completion/ready
• close() Close the handle and clean up
• read(length, position, callback) Read length bytes from offset position and call callback with the resulting ArrayBuffer. If position is a function, it will be assumed to be the callback.

Notes

• You should call Reader.close() when finished with the instance to avoid leftover handles (primarily in Node)

License

MIT