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I need to write a tool in C++ to determine the changed bits in a file compared against another file for replication. What would be the best method of accomplishing this?
I don’t have a specific OS or library in mind, I’m open to suggestions. My primary goal is reducing the amount of network traffic involved in replicating.
Look at rsync – it splits the file into blocks, calculates a checksum for each block, and transmits only the checksum to determine if there are any changesto the destination before transmitting the block data only if necessary.