log.h /log.cc: The high-level binary logging mechanism for organizing events into a sequence so that it becomes a binary log. Routines for creating, writing, deleting binary log files.

log_event.h /log_event.cc: The low-level binary logging mechanism for serializing of values into records. The Log_event class and subclasses, for creating, writing, reading, printing, and applying events of every event type. Reading and writing here is at a low level, that is, serializing values into records.

rpl_constants.h : Contains codes for INCIDENT_EVENT incident types.

slave.cc : Contains some logic for processing binary logs in a replication slave (the IO and SQL threads).

rpl_injector.h /rpl_injector.cc: Contains the injector class that allows external insertions into the binary log. This is used for cluster replication binary logging.

rpl_record.h /rpl_record.cc: Utilities for encoding and decoding table rows into and out of the format used by row events.

rpl_tblmap.h /rpl_tblmap.cc: Contains a mapping from numbers to tables. The mapping is used by the row logging system to identify tables.

rpl_utility.h /rpl_utility.cc: Contains auxiliary classes and functions used for Table_map_events, and also an auxiliary class for smart pointers

sql_binlog.cc : Code to execute BINLOG statements (the base64-encoded values that mysqlbinlog prints when it sees row events).

sql_base.cc : The function decide_logging_format() that determines whether statements should be written to the binary log using row-based or statement-based format.

mysqlbinlog.cc : The source for the mysqlbinlog utility that reads binary log files and displays them in text format. It shares some event-interpretation code with the server.