Using perl to delta large files

I am writing a perl script to submit deltas. My current code runs out
of memory when submitting large files (files in the gigabyte range).
This happens because I read the entire file contents and then call
send_string. Does anyone have any suggestions on how I can break the
file up so it doesn't run into memory problems when I delta a file?
Would I use send_stream instead of send_string?

Attached is a portion of the code that I use.

Thanks,
David

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