源代码说明： This unit contains:
TMapStream - a descendant of TStream encapsulating a memory-mapped file, with automatic mutexes for read/write access;
TTextMap - a descendant of TMapStream adding text input and output routines and optional encryption;
TRecordMap - a descendant of TMapStream adding i/o routines for record files and customizable file headers. This is an abstract class; descendants need to set the record size property in their constructors and override the ReadRec and WriteRec abstract methods.

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