/*

File: ReceiveController.m

Contains: Manages the receive tab.

Written by: DTS

Copyright: Copyright (c) 2009-2012 Apple Inc. All Rights Reserved.

Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.

("Apple") in consideration of your agreement to the following

terms, and your use, installation, modification or

redistribution of this Apple software constitutes acceptance of

these terms. If you do not agree with these terms, please do

not use, install, modify or redistribute this Apple software.

In consideration of your agreement to abide by the following

terms, and subject to these terms, Apple grants you a personal,

non-exclusive license, under Apple's copyrights in this

original Apple software (the "Apple Software"), to use,

reproduce, modify and redistribute the Apple Software, with or

without modifications, in source and/or binary forms; provided

that if you redistribute the Apple Software in its entirety and

without modifications, you must retain this notice and the

following text and disclaimers in all such redistributions of

the Apple Software. Neither the name, trademarks, service marks

or logos of Apple Inc. may be used to endorse or promote

products derived from the Apple Software without specific prior

written permission from Apple. Except as expressly stated in

this notice, no other rights or licenses, express or implied,

are granted by Apple herein, including but not limited to any

patent rights that may be infringed by your derivative works or

by other works in which the Apple Software may be incorporated.

The Apple Software is provided by Apple on an "AS IS" basis.

APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING

WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING

THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

COMBINATION WITH YOUR PRODUCTS.

IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT,

INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED

TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY

OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY

OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR

OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF

SUCH DAMAGE.

*/

#import "ReceiveController.h"

#import "NetworkManager.h"

#import "QNetworkAdditions.h"

@interface ReceiveController () <NSStreamDelegate>

// stuff for IB

@property (nonatomic, strong, readwrite) IBOutlet UIImageView * imageView;

@property (nonatomic, strong, readwrite) IBOutlet UILabel * statusLabel;

@property (nonatomic, strong, readwrite) IBOutlet UIActivityIndicatorView * activityIndicator;

@property (nonatomic, strong, readwrite) IBOutlet UIButton * receiveOrCancelButton;

- (IBAction)receiveOrCancelAction:(id)sender;

// private properties

@property (nonatomic, assign, readonly ) BOOL isReceiving;

@property (nonatomic, strong, readwrite) NSInputStream * networkStream;

@property (nonatomic, copy, readwrite) NSString * filePath;

@property (nonatomic, strong, readwrite) NSOutputStream * fileStream;

@end

@implementation ReceiveController

@synthesize networkStream = _networkStream;

@synthesize filePath = _filePath;

@synthesize fileStream = _fileStream;

@synthesize imageView = _imageView;

@synthesize statusLabel = _statusLabel;

@synthesize activityIndicator = _activityIndicator;

@synthesize receiveOrCancelButton = _receiveOrCancelButton;

#pragma mark * Status management

// These methods are used by the core transfer code to update the UI.

- (void)receiveDidStart

{

// Clear the current image so that we get a nice visual cue if the receive fails.

self.imageView.image = [UIImage imageNamed:@"NoImage.png"];

self.statusLabel.text = @"Receiving";

[self.receiveOrCancelButton setTitle:@"Cancel" forState:UIControlStateNormal];

[self.activityIndicator startAnimating];

[[NetworkManager sharedInstance] didStartNetworkOperation];

}

- (void)updateStatus:(NSString *)statusString

{

assert(statusString != nil);

self.statusLabel.text = statusString;

}

- (void)receiveDidStopWithStatus:(NSString *)statusString

{

if (statusString == nil) {

assert(self.filePath != nil);

self.imageView.image = [UIImage imageWithContentsOfFile:self.filePath];

statusString = @"Receive succeeded";

}

self.statusLabel.text = statusString;

[self.receiveOrCancelButton setTitle:@"Receive" forState:UIControlStateNormal];

[self.activityIndicator stopAnimating];

[[NetworkManager sharedInstance] didStopNetworkOperation];

}

#pragma mark * Core transfer code

// This is the code that actually does the networking.

- (BOOL)isReceiving

{

return (self.networkStream != nil);

}

- (void)startReceive

{

NSInputStream * input;

BOOL success;

NSNetService * netService;

assert(self.networkStream == nil); // don't tap receive twice in a row!

assert(self.fileStream == nil); // ditto

assert(self.filePath == nil); // ditto

// Open a stream for the file we're going to receive into.

self.filePath = [[NetworkManager sharedInstance] pathForTemporaryFileWithPrefix:@"Receive"];

assert(self.filePath != nil);

self.fileStream = [NSOutputStream outputStreamToFileAtPath:self.filePath append:NO];

assert(self.fileStream != nil);

[self.fileStream open];

// Open a stream to the server, finding the server via Bonjour. Then configure

// the stream for async operation.

netService = [[NSNetService alloc] initWithDomain:@"local." type:@"_x-SNSDownload._tcp." name:@"Test"];

assert(netService != nil);

// Until <rdar://problem/6868813> is fixed, we have to use our own code to open the streams

// rather than call -[NSNetService getInputStream:outputStream:]. See the comments in

// QNetworkAdditions.m for the details.

success = [netService qNetworkAdditions_getInputStream:&input outputStream:NULL];

assert(success);

self.networkStream = input;

self.networkStream.delegate = self;

[self.networkStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

[self.networkStream open];

// Tell the UI we're receiving.

[self receiveDidStart];

}

- (void)stopReceiveWithStatus:(NSString *)statusString

{

if (self.networkStream != nil) {

self.networkStream.delegate = nil;

[self.networkStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

[self.networkStream close];

self.networkStream = nil;

}

if (self.fileStream != nil) {

[self.fileStream close];

self.fileStream = nil;

}

[self receiveDidStopWithStatus:statusString];

self.filePath = nil;

}

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode

// An NSStream delegate callback that's called when events happen on our

// network stream.

{

assert(aStream == self.networkStream);

#pragma unused(aStream)

switch (eventCode) {

case NSStreamEventOpenCompleted: {

[self updateStatus:@"Opened connection"];

} break;

case NSStreamEventHasBytesAvailable: {

NSInteger bytesRead;

uint8_t buffer[32768];

[self updateStatus:@"Receiving"];

// Pull some data off the network.

bytesRead = [self.networkStream read:buffer maxLength:sizeof(buffer)];

if (bytesRead == -1) {

[self stopReceiveWithStatus:@"Network read error"];

} else if (bytesRead == 0) {

[self stopReceiveWithStatus:nil];

} else {

NSInteger bytesWritten;

NSInteger bytesWrittenSoFar;

// Write to the file.

bytesWrittenSoFar = 0;

do {

bytesWritten = [self.fileStream write:&buffer[bytesWrittenSoFar] maxLength:bytesRead - bytesWrittenSoFar];

assert(bytesWritten != 0);

if (bytesWritten == -1) {

[self stopReceiveWithStatus:@"File write error"];

break;

} else {

bytesWrittenSoFar += bytesWritten;

}

} while (bytesWrittenSoFar != bytesRead);

}

} break;

case NSStreamEventHasSpaceAvailable: {

assert(NO); // should never happen for the output stream

} break;

case NSStreamEventErrorOccurred: {

[self stopReceiveWithStatus:@"Stream open error"];

} break;

case NSStreamEventEndEncountered: {

// ignore

} break;

default: {

assert(NO);

} break;

}

}

#pragma mark * Actions

- (IBAction)receiveOrCancelAction:(id)sender

{

#pragma unused(sender)

if (self.isReceiving) {

[self stopReceiveWithStatus:@"Cancelled"];

} else {

[self startReceive];

}

}

#pragma mark * View controller boilerplate

- (void)viewDidLoad

{

[super viewDidLoad];

assert(self.imageView != nil);

assert(self.statusLabel != nil);

assert(self.activityIndicator != nil);

assert(self.receiveOrCancelButton != nil);

self.activityIndicator.hidden = YES;

self.statusLabel.text = @"Tap Receive to start receiving";

}

- (void)viewDidUnload

{

[super viewDidUnload];

self.imageView = nil;

self.statusLabel = nil;

self.activityIndicator = nil;

self.receiveOrCancelButton = nil;

}

- (void)dealloc

{

[self stopReceiveWithStatus:@"Stopped"];

}

@end