How to transfer large files/directories over network using AsyncSocket - objective-c

Question

I've tried the NSTask > NSData method, but the CPU/memory overhead is extremely large for anything over 1GB, so I need to find a way to do this like, say, an FTP server does it.
EDIT: How does remote desktop's copy files do it?

Answer 1

I think I got it. I had to read it into the memory in small byte-size (HAHA GET THE PUN?) pieces and transfer it over that way. Keep in mind that this only works for files, not directories. I tested it on a 450MB file and it copied in about 3 minutes with the exact same byte count as the source. It was a video, and while I was streaming it to the client, I was able to play it as well. Nifty, huh?
Without further ado, here's the code I used, slightly patched up to do a simple file-copy instead of over the network.
[[NSFileManager defaultManager] createFileAtPath:#"/path/to/file/dest" contents:nil attributes:nil];
NSFileHandle *output = [NSFileHandle fileHandleForWritingAtPath:#"/path/to/file/dest"];
uint64 offset = 0;
uint32 chunkSize = 8192;
NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:#"/path/to/file/source"];
NSAutoreleasePool *autoreleasePool = [[NSAutoreleasePool alloc] init];
NSData *data = [handle readDataOfLength:chunkSize];
NSLog(#"Entering Loop.");
while ([data length] > 0) {
[output seekToEndOfFile];
[output writeData:data];
offset += [data length];
NSLog(#"Switching Loop.");
[autoreleasePool release];
autoreleasePool = [[NSAutoreleasePool alloc] init];
[handle seekToFileOffset:offset];
data = [handle readDataOfLength:chunkSize];
}
NSLog(#"Exited Loop.");
[handle closeFile];
[autoreleasePool release];
[output closeFile];
[output release];