77ff0ec1f1contrib: support reading XORed blocks in linearize-data.py script (Sebastian Falbesoner) Pull request description: This PR is a small follow-up for #28052, adding support for the block linearization script to handle XORed blocksdir *.dat files. Note that if no xor.dat file exists, the XOR pattern is set to all-zeros, in order to still support blockdirs that have been created with versions earlier than 28.x. Partly fixes issue #30599. ACKs for top commit: achow101: ACK77ff0ec1f1tdb3: ACK77ff0ec1f1hodlinator: ACK77ff0ec1f1Tree-SHA512: 011eb02e2411de373cbbf4b26db4640fc693a20be8c2430529fba6e36a3a3abfdfdc3b005d330f9ec2846bfad9bfbf34231c574ba99289ef37dd51a68e6e7f3d
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