/*

File: SendController.m

Contains: Manages the Send 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

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

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

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

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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

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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

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*/

#import "SendController.h"

#import "NetworkManager.h"

#import "QNetworkAdditions.h"

enum {

kSendBufferSize = 32768

};

@interface SendController () <NSStreamDelegate>

// stuff for IB

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

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

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

- (IBAction)sendAction:(UIView *)sender;

- (IBAction)cancelAction:(id)sender;

// private properties

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

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

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

@property (nonatomic, assign, readonly ) uint8_t * buffer;

@property (nonatomic, assign, readwrite) size_t bufferOffset;

@property (nonatomic, assign, readwrite) size_t bufferLimit;

@end

@implementation SendController

{

uint8_t _buffer[kSendBufferSize];

}

@synthesize networkStream = _networkStream;

@synthesize fileStream = _fileStream;

@synthesize bufferOffset = _bufferOffset;

@synthesize bufferLimit = _bufferLimit;

@synthesize statusLabel = _statusLabel;

@synthesize activityIndicator = _activityIndicator;

@synthesize cancelButton = _stopButton;

#pragma mark * Status management

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

- (void)sendDidStart

{

self.statusLabel.text = @"Sending";

self.cancelButton.enabled = YES;

[self.activityIndicator startAnimating];

[[NetworkManager sharedInstance] didStartNetworkOperation];

}

- (void)updateStatus:(NSString *)statusString

{

assert(statusString != nil);

self.statusLabel.text = statusString;

}

- (void)sendDidStopWithStatus:(NSString *)statusString

{

if (statusString == nil) {

statusString = @"Send succeeded";

}

self.statusLabel.text = statusString;

self.cancelButton.enabled = NO;

[self.activityIndicator stopAnimating];

[[NetworkManager sharedInstance] didStopNetworkOperation];

}

#pragma mark * Core transfer code

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

// Because buffer is declared as an array, you have to use a custom getter.

// A synthesised getter doesn't compile.

- (uint8_t *)buffer

{

return self->_buffer;

}

- (BOOL)isSending

{

return (self.networkStream != nil);

}

- (void)startSend:(NSString *)filePath

{

NSOutputStream * output;

BOOL success;

NSNetService * netService;

assert(filePath != nil);

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

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

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

self.fileStream = [NSInputStream inputStreamWithFileAtPath:filePath];

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-SNSUpload._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:NULL outputStream:&output];

assert(success);

self.networkStream = output;

self.networkStream.delegate = self;

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

[self.networkStream open];

// Tell the UI we're sending.

[self sendDidStart];

}

- (void)stopSendWithStatus:(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.bufferOffset = 0;

self.bufferLimit = 0;

[self sendDidStopWithStatus:statusString];

}

- (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: {

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

} break;

case NSStreamEventHasSpaceAvailable: {

[self updateStatus:@"Sending"];

// If we don't have any data buffered, go read the next chunk of data.

if (self.bufferOffset == self.bufferLimit) {

NSInteger bytesRead;

bytesRead = [self.fileStream read:self.buffer maxLength:kSendBufferSize];

if (bytesRead == -1) {

[self stopSendWithStatus:@"File read error"];

} else if (bytesRead == 0) {

[self stopSendWithStatus:nil];

} else {

self.bufferOffset = 0;

self.bufferLimit = bytesRead;

}

}

// If we're not out of data completely, send the next chunk.

if (self.bufferOffset != self.bufferLimit) {

NSInteger bytesWritten;

bytesWritten = [self.networkStream write:&self.buffer[self.bufferOffset] maxLength:self.bufferLimit - self.bufferOffset];

assert(bytesWritten != 0);

if (bytesWritten == -1) {

[self stopSendWithStatus:@"Network write error"];

} else {

self.bufferOffset += bytesWritten;

}

}

} break;

case NSStreamEventErrorOccurred: {

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

} break;

case NSStreamEventEndEncountered: {

// ignore

} break;

default: {

assert(NO);

} break;

}

}

#pragma mark * Actions

- (IBAction)sendAction:(UIView *)sender

{

assert( [sender isKindOfClass:[UIView class]] );

if ( ! self.isSending ) {

NSString * filePath;

// Use the tag on the button to determine which image to send.

filePath = [[NetworkManager sharedInstance] pathForTestImage:sender.tag];

assert(filePath != nil);

[self startSend:filePath];

}

}

- (IBAction)cancelAction:(id)sender

{

#pragma unused(sender)

[self stopSendWithStatus:@"Cancelled"];

}

#pragma mark * View controller boilerplate

- (void)viewDidLoad

{

[super viewDidLoad];

assert(self.statusLabel != nil);

assert(self.activityIndicator != nil);

assert(self.cancelButton != nil);

self.activityIndicator.hidden = YES;

self.statusLabel.text = @"Tap a picture to start the send";

self.cancelButton.enabled = NO;

}

- (void)viewDidUnload

{

[super viewDidUnload];

self.statusLabel = nil;

self.activityIndicator = nil;

self.cancelButton = nil;

}

- (void)dealloc

{

[self stopSendWithStatus:@"Stopped"];

}

@end