Data recovery on boot-looped Samsung Galaxy S II GT-i9100

I have a boot-looped Samsung Galaxy S II GT-i9100, running the Android 2.3 Gingerbread it came with, unrooted and unmodified (although Optus-branded). The phone's battery depleted while the phone was running; now, any attempt to boot the phone results in the boot sequence looping indefinitely. I wish to recover data from this device (before attempting to solve the boot-loop problem later via factory reset or other method). I read the [boot-loop tag information](https://android.stackexchange.com/tags/boot-loop/info) but the instructions have not been helpful for me: I have tried to boot into Safe Mode, but my attempts also trigger the indefinite boot-loop; I wiped the cache via stock recovery but that had no effect; and, the last recommendation was a factory reset which I won't follow until I have recovered the data. I believe USB Debugging is already enabled. I have an 8GB external SD card and I have Linux Mint 13 as my desktop operating system. [This answer](https://android.stackexchange.com/a/59044/81471) indicated that it should be possible to root the phone and recover data via the [Android Debug Bridge (ADB)](http://en.wikipedia.org/wiki/Android_software_development#ADB) for a different Samsung Galaxy S version, but I need instructions for the Samsung Galaxy S II GT-i9100 if this avenue is worth pursuing. This seems related to [this question](https://android.stackexchange.com/questions/71776/samsung-galaxy-2-stuck-at-start-up-can-i-recovery-the-phone-or-at-least-the-dat) but could be a different [variant](http://en.wikipedia.org/wiki/Samsung_Galaxy_S_II#Variants) and issue. It's not the same as [this question](https://android.stackexchange.com/questions/39316/how-to-regain-control-over-a-samsung-galaxy-s-ii-with-a-boot-loop) because I need to recover data.