Loads a local file into the current PhoneGap application's temporary directory.

temp_file_retriever.js

// Thanks http://stackoverflow.com/questions/16065494
// WARNING: Untested. Please provide feedback.

/**
 * Request a local file into the PhoneGap application's temporary directory.
 *
 * Get a local file into the the current PhoneGap application's temporary
 * directory given a larger filesystem file URI.
 *
 * @param {String} uri The URI to load the file from.
 * @param {function} onReady Function to call after the file has been loaded.
 *      This function should take a single argument: a PhoneGap File object
 *      instance.
 * @param {function} onError Function to call if an error is encountered while
 *      loading the file. Should take a single argument: an Error object.
**/
function getLocalFileFromTemp(uri, onReady, onError)
{
    window.requestFileSystem(LocalFileSystem.TEMPORARY, 0, function(fs){
        fs.root.getFile("temp", {create: true, exclusive: false},
          function(entry){
            fileTransfer.download(
                fileURI, // the filesystem uri you mentioned
                entry.fullPath,
                function(entry) {
                    onReady(entry);
                },
                function(error) {
                    onError(error);
                },
                false,
                null
            );
        }, function(){
            onError('File create error.');
        });
    }, null);
}