Bugfix for CCPackageDownloadManager and resuming downloads.

In case of resuming a download of package that was not stored initially in the download manager by enqueuing a resume would fail.
This was the case when an app loads persisted packages with the status CCPackageStatusDownloadPaused.
The download object is created and added to the manager if there is none.

Author: NickyWeber

UnitTests/CCPackageDownloadManagerTests.m

@@ -13,6 +13,7 @@
 #import "CCDirector.h"
 #import "AppDelegate.h"
 #import "CCUnitTestAssertions.h"
+#import "CCPackage_private.h"
 
 @interface CCPackageDownloadManagerTestURLProtocol : NSURLProtocol @end
 
@@ -175,6 +176,22 @@ - (void)testEnqueuePausedPackage
     [self assertPackagesDownloadedAndContentsAreAsExpected:@[package1]];
 }
 
+- (void)testResumeDownloadAfterLoadingPackages
+{
+    // This test aims at the situation when coming back from persistency and
+    // the package manager resume downloads.
+
+    CCPackage *package = [self completePackageWithName:@"package"];
+    package.status = CCPackageStatusDownloadPaused;
+    package.localDownloadURL = [NSURL fileURLWithPath:[_downloadManager.downloadPath stringByAppendingPathComponent:@"foo.zip"]];
+
+    [_downloadManager enqueuePackageForDownload:package];
+
+    [self waitUntilDelegateReturns];
+
+    [self assertPackagesDownloadedAndContentsAreAsExpected:@[package]];
+}
+
 - (void)waitUntilDelegateReturns
 {
     while (!_allDownloadsReturned)

cocos2d/CCPackageDownloadManager.h

@@ -45,7 +45,8 @@
 - (void)enqueuePackageForDownload:(CCPackage *)package;
 
 /**
- *  Cancels a download of a given package. Downloaded file will be deleted.
+ *  Cancels a download of a given package. Downloaded data will be deleted.
+ *  Status of package is reset to CCPackageStatusInitial.
  *
  *  @param package The package that should be cancelled
  */

cocos2d/CCPackageDownloadManager.m

@@ -126,11 +126,25 @@ - (void)pauseDownloadOfPackage:(CCPackage *)package
 
 - (void)resumeDownloadOfPackage:(CCPackage *)package
 {
+    [self createDownloadIfNotExistForPackage:package];
+
     CCLOGINFO(@"[PACKAGE/DOWNLOADS][INFO] Resuming download of package %@.", package);
     CCPackageDownload *packageDownload = [self packageDownloadForPackage:package];
     [packageDownload resume];
 }
 
+- (void)createDownloadIfNotExistForPackage:(CCPackage *)package
+{
+    if (![self packageDownloadForPackage:package])
+    {
+        CCPackageDownload *packageDownload = [[CCPackageDownload alloc] initWithPackage:package
+                                                                               localURL:package.localDownloadURL];
+        packageDownload.delegate = self;
+
+        [_downloads addObject:packageDownload];
+    }
+}
+
 - (void)pauseAllDownloads
 {
     CCLOGINFO(@"[PACKAGE/DOWNLOADS][INFO] Pausing all downloads.");