Joomla custom component migration from 1.5 to 2.5

I have migrated my site from Joomla 1.5 to Joomla 2.5. There is a custom component developed by 3rd party which is not working properly in Joomla 2.5. Now, I am facing challenges to get this done in the new version. I am not aware of the functions used in the component that are not working or throwing errors.

Can anyone share a list of Joomla 1.5 component development functions which are deprecated in Joomla 2.5 or should be updated?

For e.g. see the following functions/variable:

global $mainframe; // In Joomla 1.5

$mainframe =& JFactory::getApplication(); // In Joomla 2.5

I just want to make myself more clear that I am looking for joomla custom component migration from 1.5 to 2.5. Any help would be appreciated. Thanks in advance.

Solution

Below you find some usefull links but first here are some thoughts from my experience:

If your component is a state of the art Joomla 1.5 component, upgrading it to 2.5 won't be so hard (some / most components are not so well coded).
Think / search for a replacement that already works in 2.5, it may save you the trouble
Consider redoing / rethinking the whole component having in mind current web development standards / trends, changes to the Joomla! API.

Adapting a Joomla 1.5 extension to Joomla 1.6

Potential backward compatibility issues in Joomla 2.5 and Joomla Platform 11.4

Steps to update Joomla 1.5 component to Joomla 2.5 component [closed]