Backrow, Thats a big ass framework

Some months a ago i spoke about front row. First, the plan was to reverse engineering it, then it was building a plugin for it. Well, it hasn't exactly had my complete attention, however it did drift back into my mind today.

The main sticking point for me has been the lack of documenation, however this should be expected considering that we're talking about a unsupported framework, from one of the most secretive corporate entities in existance.

So in my quest to write for leopard front row, i decided that a nice class diagram would come in handy, easy right...

Well this is what it looks like, after exploring appoximately 30-40% of the 500+ classes!

However i've learnt alot about naming conventions and framework layout. The most striking thing is the level of depth. For example there are classes for everything under the sun, like the Entry of IPv6 addresses. Stuff i personally would have overlooked. I guess thats why i get the semi-big bucks.

Needless to say the folks at apple know how to design a framework, and have done a great job in the absence of namespaces, to provide rigid catagorization of classes.

Class names are nice and logical, for example any class ending with 'layer', is most likely a subclass of BRRenderLayer, eg. BRListLayer or BRTextMenuLayer.

The experience has also made me feel like i've been using the framework, rather than an outsider, looking in. So hopefully in the coming days i can actually leverage this thing to do something other than allow me navigate tv series from the comfort of my bed.

Quote of the Day

"It's a pitty they made so much fuss about gay cowboys, it's actually a decent film"

I happen to think brokeback mountain is a half decent flick

And to think people think i waste my time

I've been hitting the Dev Trail pretty hard over the last week or so. My fringe Cocoa/Objective-C skills are getting better each day. To give you an idea of what my Programming space looks like here's a screenshot.

To summerize, i'm in the middle of linking the mysql-cocoa framework into my project. Now i have hit a slight snag on that front. The snag being that it looks like i can't sell the app.

Why? Because the use of the GPL'd open source framework means that i have to release the source code. Now for a long time, i have considered releasing an application that one has to pay for, but is also open source. However with this kinda of app, my target market, most likely already has xcode installed, and would find it trivial to download the source and hit 'build'.

I'm gonna email the FSF, and find out what they have to say. But i think i might try and release this as an open source application. I love open source as much as the next guy, so maybe this is the way it should go down.

In other news i've finally popped for a Western digital 250GB notebook hard drive. After some stupidity (and a trip to Eastleigh) on my part it's churning away inside my Macbook. The old drive is now a Time machine Drive, speaking of time machine ...



It's a nutty excuse for an interface, but it really is fantastic. Pre-Time Machine, i used a backup script i 'wrote' in automator, however it wasn't as flash as this. However it did zip my documents folder from almost 2GB to 700MB which always impressed me, or at least one side of me.

Well it's almost the end of another year and this blog has seen quite a few annual transitions now, 4 to be correct. In keeping with RSS tradition i'll have the usual wrap up posts, plus a 4/5 redesign. Hopefully this time done properly with more ajax than you can shake a stick at, and a cleaner ui, after all i'm a professional now ........



Quote of the Day

Caption

Quick and Dirty Leopard Dock Image replacement script

This one is for all the dock hackers out there. I'm gonna try and roll this into a application during my lectures today ^_^

Cut and paste the script into a text editor of your choice, and save it as "dockSwitcher.sh"

To use this save your new dock images on the desktop and then run the script. Beware i haven't tested as i A. Use the non-glass dock, and B. didn't have time. So use with caution.


#!/bin/bash
## Quick and dirty Dock Image Replacement script
## Jonathan Dalrymple
## November 6, 2007

##Root Checking
## Thanks to
## http://blog.mecworks.com/articles/2006/02/23/bash-scripting-tip-running-a-script-as-root/
CMDLN_ARGS="$@" # Command line arguments for this script
export CMDLN_ARGS

# Run this script as root if not already.
chk_root () {

if [ ! $( id -u ) -eq 0 ]; then
echo "Please enter root's password."
exec su -c "${0} ${CMDLN_ARGS}" # Call this prog as root
exit ${?} # sice we're 'execing' above, we wont reach this exit
# unless something goes wrong.
fi

}

# Check if user is root
chk_root

##Back up dock
cp /System/Library/CoreServices/Dock.app ~/Dock.backup.app

##Remove the old files
rm /System/Library/CoreServices/Dock.app/Contents/Resources/scurve-l.png

rm /System/Library/CoreServices/Dock.app/Contents/Resources/scurve-m.png

rm /System/Library/CoreServices/Dock.app/Contents/Resources/scurve-sm.png

rm /System/Library/CoreServices/Dock.app/Contents/Resources/scurve-xl.png

##Put in the new files
mv ~/Desktop/scurve-l.png /System/Library/CoreServices/Dock.app/Contents/Resources/

mv ~/Desktop/scurve-m.png /System/Library/CoreServices/Dock.app/Contents/Resources/

mv ~/Desktop/scurve-sm.png /System/Library/CoreServices/Dock.app/Contents/Resources/

mv ~/Desktop/scurve-xl.png /System/Library/CoreServices/Dock.app/Contents/Resources/

##Remove dock images from desktop
rm ~/Desktop/scurve-l.png

rm ~/Desktop/scurve-m.png

rm ~/Desktop/scurve-sm.png

rm ~/Desktop/scurve-xl.png

##
killall Dock




Leopard Hacking : Front Row

Thanks to my coffee, i can't seem to sleep. So to pass the time i decided to do some more work on a new brain wave i just had this evening.

It centers around front row. Well actually it had nothing to do with front row, however building on top of front row makes more sense, than starting out from scratch.

Now as you may or may not know, like most of the cool gui stuff on osx front row is a closed environment. Which means it's hacking time. Something i always wanted to play with is a decompiler. Now i'm no Dmitry Grinberg, so assembly doesn't wash with me. Instead i found this little gem.

After a a brief compile it gave me this wonderful output



struct _NSZone;

/*
* File: Movies
* Arch: Intel 80x86 (i386)
*/

@protocol BRMenuListItemProvider
- (long)itemCount;
- (float)heightForRow:(long)fp8;
- (BOOL)rowSelectable:(long)fp8;
- (id)titleForRow:(long)fp8;
- (id)itemForRow:(long)fp8;
@end

@protocol NSObject
- (BOOL)isEqual:(id)fp8;
- (unsigned int)hash;
- (Class)superclass;
- (Class)class;
- (id)self;
- (struct _NSZone *)zone;
- (id)performSelector:(SEL)fp8;
- (id)performSelector:(SEL)fp8 withObject:(id)fp12;
- (id)performSelector:(SEL)fp8 withObject:(id)fp12 withObject:(id)fp16;
- (BOOL)isProxy;
- (BOOL)isKindOfClass:(Class)fp8;
- (BOOL)isMemberOfClass:(Class)fp8;
- (BOOL)conformsToProtocol:(id)fp8;
- (BOOL)respondsToSelector:(SEL)fp8;
- (id)retain;
- (oneway void)release;
- (id)autorelease;
- (unsigned int)retainCount;
- (id)description;
@end

@interface RUIMoviesAppliance : BRAppliance
{
}

+ (id)moduleKey;
- (id)init;
- (void)dealloc;
- (id)moduleIconName;
- (float)moduleIconReflectionOffset;
- (id)moduleName;
- (id)moduleKey;
- (id)applianceController;

@end

@interface RUIMoviesApplianceController : BRMediaMenuController
{
NSArray *_headerRows;
NSMutableArray *_titlesWithUnplayedContent;
RUIMovieFolderCollection *_movieFolderCollection;
BRMovieTrailersProvider *_trailersProvider;
unsigned int _hasLocalMovies:1;
unsigned int _movieTrailersPreviewRequested:1;
unsigned int _movieTrailersSelected:1;
BRDataStore *_dataStore;
Class _msClass;
}

- (id)init;
- (void)dealloc;
- (id)musicStoreBaseType;
- (BOOL)menuDisplaysLeftIcon;
- (void)networkStatusChanged:(id)fp8;
- (BOOL)isVolatile;
- (id)loadModelData;
- (void)refreshControllerForModelUpdate;
- (BOOL)shouldRefreshForUpdateToObject:(id)fp8;
- (long)defaultIndex;
- (void)itemSelected:(long)fp8;
- (void)wasExhumedByPoppingController:(id)fp8;
- (void)wasPushed;
- (void)willBePopped;
- (void)wasPopped;
- (id)previewControlForItem:(long)fp8;
- (BOOL)brEventAction:(id)fp8;

@end

@interface RUIMoviesApplianceController (AsyncNotifications)
- (void)_movieTrailersLoaded:(id)fp8;
- (void)_swapNewController:(id)fp8;
@end

@interface RUIMoviesApplianceController (DataSourceAccess)
- (id)_movieTrailers:(id *)fp8;
@end

@interface RUIMoviesApplianceController (MediaParadeBuilders)
- (id)_moviesFolderParade;
- (id)_movieTrailersParade;
- (id)_stingrayMediaPreview;
@end

@interface RUIMoviesApplianceController (MovieLoading)
- (void)_cacheUnplayedTitles;
- (BOOL)_hasUnplayedMovies;
@end

@interface RUIMoviesApplianceController (MovieSelection)
- (id)_movieSelectedAtIndex:(long)fp8;
@end

@interface RUIMoviesApplianceController (MenuBuilding)
- (id)_buildMovieTrailersMenu;
- (id)_movieTrailersController:(id)fp8;
- (id)_buildMyMoviesMenu;
- (id)_stingrayFrontPageController;
- (id)_headerRows;
@end

@interface RUIMoviesApplianceController (DataProviders)
- (id)itemForRow:(long)fp8;
- (long)itemCount;
- (id)titleForRow:(long)fp8;
- (float)heightForRow:(long)fp8;
- (BOOL)rowSelectable:(long)fp8;
@end

@interface RUISDMovieTrailersController : RUIMovieTrailersController
{
}

- (id)initWithTrailers:(id)fp8;
- (id)previewControlForItem:(long)fp8;
- (id)titleForRow:(long)fp8;
- (long)defaultIndex;
- (id)itemForRow:(long)fp8;
- (long)itemCount;
- (void)itemSelected:(long)fp8;

@end

@interface RUIMovieTrailersController : BRMediaMenuController
{
NSArray *_trailers;
}

- (id)initWithTrailers:(id)fp8;
- (void)dealloc;
- (BOOL)isNetworkDependent;
- (void)itemSelected:(long)fp8;
- (long)itemCount;
- (id)itemForRow:(long)fp8;
- (id)titleForRow:(long)fp8;
- (float)heightForRow:(long)fp8;
- (BOOL)rowSelectable:(long)fp8;
- (id)previewControlForItem:(long)fp8;

@end

@interface RUISDMovieTrailersController (Private)
- (id)_HDMovieTrailers:(id *)fp8;
@end

@interface RUIMovieTrailersController (Private)
- (id)_movieTrailersTitle;
@end

@interface RUIMovieDirectoryController : BRMediaMenuController
{
RUIMovieFolderCollection *_collection;
NSString *_path;
}

- (id)initWithMovieFolderCollection:(id)fp8;
- (void)dealloc;
- (id)moviesForParade;
- (void)itemSelected:(long)fp8;
- (id)previewControlForItem:(long)fp8;
- (id)mediaPreviewMissingMediaType;
- (BOOL)mediaPreviewShouldShowMetadata;
- (BOOL)mediaPreviewShouldShowMetadataImmediately;
- (long)itemCount;
- (id)itemForRow:(long)fp8;
- (id)titleForRow:(long)fp8;
- (float)heightForRow:(long)fp8;
- (BOOL)rowSelectable:(long)fp8;

@end

@interface RUIMovieFolderAsset : BRBaseMediaAsset
{
NSString *_displayName;
NSURL *_mediaURL;
NSString *_folderPath;
BRImage *_posterImage;
BOOL _requestedImage;
}

+ (id)assetForName:(id)fp8 folderPath:(id)fp12 andMediaURL:(id)fp16;
- (void)dealloc;
- (void)setDisplayName:(id)fp8;
- (void)setMediaURL:(id)fp8;
- (void)setMovieFolderPath:(id)fp8;
- (id)assetID;
- (id)title;
- (id)mediaURL;
- (BOOL)hasCoverArt;
- (id)coverArt;
- (id)dateAcquired;
- (id)mediaType;

@end

@interface RUIMovieFolderAsset (ArtLoading)
- (void)_loadImage:(id)fp8;
- (void)_imageLoaded:(id)fp8;
@end

@interface RUIMovieFolderCollection : BRBaseMediaCollection
{
RUIMovieFolderCollection *_parent;
NSString *_displayName;
NSString *_folderPath;
NSArray *_childCollections;
NSArray *_childAssets;
}

+ (id)collectionForName:(id)fp8 folderPath:(id)fp12 andParent:(id)fp16;
- (void)dealloc;
- (void)setParent:(id)fp8;
- (void)setDisplayName:(id)fp8;
- (void)setMovieFolderPath:(id)fp8;
- (id)childCollections;
- (id)parentCollection;
- (id)collectionType;
- (id)collectionID;
- (int)count;
- (id)mediaAssets;
- (id)title;
- (id)titleForSorting;
- (BOOL)hasCoverArt;
- (id)coverArt;
- (BOOL)isLocal;

@end

@interface RUIMovieFolderCollection (Private)
- (void)_generateCollectionChildren;
@end

@interface BRMediaCollectionType (FolderCollectionExtension)
+ (id)folderCollection;
@end

What you see here is the headers/interface & protocol files for all the different classes located within Front rows movies appliance.

If you want to see your own front row app, it's located @ /system/library/coreservices/front row.app

Now i had heard that some good folks over at Awkward TV forums have hacked appliances for the Apple TV which is basically what the new front row on leopard is, however these don't seem to work 'out of the box', and apparently Apple updated this version before the roll out.

Coupled with all the above, i have reason to believe that the new appliances are digitally signed by [chinese] ni cai, Apple.

By reasoning for this, is a did a hex dump (using 0xED) of the appliance executables, and found the following string(s) @ 135535

"Apple Certification Authority1301U*Apple Code Signing Certification Authority"

Now just after typing the above sentence, it dawned on me that this might be for the transactions with the ITMS, for movie trailers, however i checked the settings appliance and found the same thing.

Also i tried deleting the various applications from a running front row, and it handles them gracefully, and also doesn't mind having new ones dropped in. I tried droping in the rss apple tv plugin, however it didn't like it very much.

I'm a programmer, not a hacker so this is about the limit of my skill, especially if it envolves digitally signed apps. I can barely deal with the symbian signed apps, never mind about these ones. If got some ideas or feel like getting dirty and dodging some DMCA takedown notices let me know.

UPDATE

i found this URL above the previous string, http://www.apple.com/appleca/

turns out that the certificate may be freely available, which might make life a tad bit easier.

PS. to any one wanting to warn me for breaking the law, i'm not a US resident ^_^

I know i can count, but i'm not sure about my mac

So in a moment of boredom, i opened up my trusty text viewer, and had a look at some files. Namely a RTF, and a Text File.

First off, i now understand why programmers love plain text files so much. First off, there are no bytes wasted on headers. It's straight into the data, no messing and no playing.

So here is the test stub

#!/bin/bash

## Coursework mass compilation

cd ~/Desktop/OOTM

javac TerminalInput.java

javac Deck.java

javac Player.java

javac Game.java

javac CardGame.java

## Run the application

##java CardGame

This was a little bash script i wrote to help compile my coursework.
Not to remember the basics, each character is equal to a single byte, or 8 bits. FF is therefore equal to 255.

The plain text file is 8KB, with 204 characters. My maths tells me that should be equal to 204 bytes. But for some reason, my mac accounts another 1300 + bytes!!

Mean while the Rtf file is 4KB, with 561 bytes, which is the exact number of characters in the file. But wait you say, there are only 204 characters in the file. Correct, so whats the other junk ....

{\rtf1\mac\ansicpg10000\cocoartf824\cocoasubrtf420
{\fonttbl\f0\fswiss\fcharset77 Helvetica;}
{\colortbl;\red255\green255\blue255;}
\paperw11900\paperh16840\margl1440\margr1440\vieww9000\viewh8400\viewkind0
\pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\ql\qnatural\pardirnatural

\f0\fs24 \cf0

I only went through it briefly, but it appears to show the font types, and colors for the file.

But my question to the world is, why on earth is the text file twice the size, but yet still halve the number of bytes in the hex editor?