michael@0: /**
michael@0:  * Expects an object containing a blob, a start offset, an end offset
michael@0:  * and an optional content type to slice the blob. Returns an object
michael@0:  * containing the size and type of the sliced blob.
michael@0:  */
michael@0: onmessage = function(event) {
michael@0:   var blob = event.data.blob;
michael@0:   var start = event.data.start;
michael@0:   var end = event.data.end;
michael@0:   var contentType = event.data.contentType;
michael@0: 
michael@0:   var slicedBlob;
michael@0:   if (contentType == undefined && end == undefined) {
michael@0:     slicedBlob = blob.slice(start);
michael@0:   } else if (contentType == undefined) {
michael@0:     slicedBlob = blob.slice(start, end);
michael@0:   } else {
michael@0:     slicedBlob = blob.slice(start, end, contentType);
michael@0:   }
michael@0: 
michael@0:   var rtnObj = new Object();
michael@0: 
michael@0:   rtnObj.size = slicedBlob.size;
michael@0:   rtnObj.type = slicedBlob.type;
michael@0: 
michael@0:   postMessage(rtnObj);
michael@0: };