Accessing Standard Libraries code

Hello, I'm trying to work out a bug communicating with a GPS module (LS20031 module). The Sparkfun blog showed others with a similar problem that they solved by increasing a buffer size in the NewSoftSerial library. I'm using Arduino 1.0.1, so the NewSoftSerial library is now a standard library renamed SoftwareSerial. I don't know how to get to the source file for it to try to modify it. I'm developing on a Mac OSX 10.7.4. Any advice where to access this?

Right-click on the Arduino icon, and select Show Package Contents. The files you want are in Contents/Resources/Java/libraries/SoftwareSerial.