Refactor download mechanism to allow multiple concurrent downloads. Allow downloads to be cancelled. Allow js to query if files exist in the cache. Fix some compiler warnings.

OpenRA.Launcher.Mac/Download.m

@@ -0,0 +1,74 @@
+//
+//  Download.m
+//  OpenRA
+//
+//  Created by Paul Chote on 19/11/10.
+//  Copyright 2010 __MyCompanyName__. All rights reserved.
+//
+
+#import "Download.h"
+#import "GameInstall.h"
+#import "JSBridge.h"
+
+@implementation Download
+
++ (id)downloadWithURL:(NSString *)aURL filename:(NSString *)aFilename key:(NSString *)aKey game:(GameInstall *)aGame
+{
+	id newObject = [[self alloc] initWithURL:aURL filename:aFilename key:aKey game:aGame];
+	[newObject autorelease];
+	return newObject;
+}
+
+- (id)initWithURL:(NSString *)aURL filename:(NSString *)aFilename key:(NSString *)aKey game:(GameInstall *)aGame;
+{
+	self = [super init];
+	if (self != nil)
+	{
+		url = [aURL retain];
+		filename = [aFilename retain];
+		key = [aKey retain];
+		game = [aGame retain];
+		
+		NSLog(@"Starting download...");
+		task = [game runAsyncUtilityWithArg:[NSString stringWithFormat:@"--download-url=%@,%@",url,filename]
+								   delegate:self
+						   responseSelector:@selector(utilityResponded:)
+						 terminatedSelector:@selector(utilityTerminated:)];
+		[task retain];
+	}
+	return self;
+}
+
+- (void)cancel
+{
+	// Stop the download task. utilityTerminated: will handle the cleanup
+	NSLog(@"Cancelling");
+	NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
+	[nc removeObserver:self name:NSFileHandleReadCompletionNotification object:[[task standardOutput] fileHandleForReading]];
+	[nc removeObserver:self name:NSTaskDidTerminateNotification object:task];
+	[task terminate];
+}
+
+- (void)utilityResponded:(NSNotification *)n
+{
+	NSData *data = [[n userInfo] valueForKey:NSFileHandleNotificationDataItem];
+	NSString *response = [[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding] autorelease];
+	NSLog(@"r: %@",response);
+	
+	[[JSBridge sharedInstance] notifyDownloadProgress:self];
+		
+	// Keep reading
+	if ([n object] != nil)
+		[[n object] readInBackgroundAndNotify];
+}
+
+- (void)utilityTerminated:(NSNotification *)n
+{
+	NSLog(@"utility terminated");
+	NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
+	[nc removeObserver:self name:NSFileHandleReadCompletionNotification object:[[task standardOutput] fileHandleForReading]];
+	[nc removeObserver:self name:NSTaskDidTerminateNotification object:task];
+	[task release]; task = nil;
+}
+
+@end