A tool to compare Doom demo state dumps

./democomp state_dump1.bin state_dump2.bin

democomp compares state dumps generated by appropriately modified Doom source ports. Whenever a discrepancy is found, democomp prints out the gametic, the value types (u8, str, etc.), and the values in hopes of giving the user helpful information for locating the source of the desync.

democomp and the state dump format use MessagePack to ensure binary format portability and libxdiff to keep demo state dumps small. democomp will compare file sizes and SHA-256 hashes in order to detect matching demos without the in-depth comparison, greatly improving scan time (useful for automated checking).

• democomp could be faster; some profiling is probably in order.
• State dumps compress well; it would be useful for democomp to support 2-3 compression formats
• Read the demo format from a configuration file

democomp uses code from D2K and PrBoom+, and as such is licensed under the terms of the GNU General Public License v2.0, or, at your option, any later version of the license. The SHA-256 code is from the mbed-tls project, licensed through the Apache License, Version 2.0.