Incompleted chunk processing

[yoon-boom]

First of all, I have limited time and knowledge to understand the lower level implementation.
Here is what I am doing.

1. Download Physical files.
2. Once, have physical file then request asynchronouslyRetrieveImageForEntity:withFormatName:completionBlock:
3. load image from completion block. At this point, bitmap array might have interrupted not filling expected bytes.

I want to know, is there any built in method to check bitmap has been completed? So that I can check incompleted one and re-do processing?
Thank you.
ORIGINAL:

Image from FICImageTable

[yoon-boom]

Self closing this issue. Because it was not FIC problem but my handling of downloading outputstream. Ended up comparing it from response header-> Content-Length between the physical file byte [[[NSFileManager defaultManager] attributesOfItemAtPath:tmpImgPath error:&possibleFileError] fileSize] solved my issue.