javascript - How to manipulate filestream in memory before uploading -


i'm working on uploader needs censor few bytes in uploaded data overwriting them predetermined value, before uploading them.

right now, i've hooked onsubmit event because allows non-blocking work performed. below can see event handler. before call promise.success(); note heavily commented part, problem need with. how can return/set byte array there?

onsubmit: function (id, name) {     // http://docs.fineuploader.com/branch/master/api/events.html#submit     // called when item has been selected , candidate uploading.     // return false prevent submission uploader.      // create promise     var promise = new qq.promise();      // configure file reader     var reader = new filereader();     reader.onerror = function (e) {         promise.failure("error occured reading file");     };     reader.onabort = function (e) {         promise.failure("file reading aborted");     };     reader.onload = function (e) {         var buffer = reader.result;         var bytearray = new uint8array(buffer);          manipulatebytearray(bytearray);          /******************* missing part... **********************/         // todo (how return manipulated bytearray?)         /******************* missing part...**********************/          // signal success         promise.success();     }      // initiate async work     var file = this.getfile(id);     reader.readasarraybuffer(file);      // return promise     return promise; },

i figured out. crucial part:

        if(needsmanipulation(bytearray))         {             manipulatebytearray(bytearray);              // construct new blob             var newblob = { blob: new blob([bytearray], { type: 'application/octet-stream' }), name: name };              // restart process adjusted file             uploader.addfiles(newblob);              // signal failure , exit             promise.failure();             return;         }

here's revised code:

onsubmit: function (id, name) {     // http://docs.fineuploader.com/branch/master/api/events.html#submit     // called when item has been selected , candidate uploading.     // return false prevent submission uploader.      // create promise     var promise = new qq.promise();      // add uploader instance closure     var uploader = this;      // configure file reader     var reader = new filereader();     reader.onerror = function (e) {         promise.failure("error occured reading file");     };     reader.onabort = function (e) {         promise.failure("file reading aborted");     };     reader.onload = function (e) {         var buffer = reader.result;         var bytearray = new uint8array(buffer);          if(needsmanipulation(bytearray))         {             manipulatebytearray(bytearray);              // construct new blob             var newblob = { blob: new blob([bytearray], { type: 'application/octet-stream' }), name: name };              // restart process adjusted file             uploader.addfiles(newblob);              // signal failure , exit             promise.failure();             return;         }          // signal success         promise.success();     }      // initiate async reading work     var file = this.getfile(id);     reader.readasarraybuffer(file);      // return promise     return promise; },

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