📄 kwbtree.txt
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THE WINHELP |KWBTREE INTERNAL FILE
==================================
The |KWBTREE file acts as an index to the |KWDATA file, and is arranged as
a b-tree. See b-tree.txt for a general discussion of b-trees. This file
along with the |KWDATA and |KWMAP files are used by WinHelp for keyword
searching.
The index pages of the b-tree use zero-terminated ASCII strings as their
key values. The leaf pages store variable-length records which begin
with zero-terminated ASCII strings (the actual names of the 'keywords'),
and then contain a two-byte 'count' value (the number of topics to which
this keyword refers) and a four-byte plain offset into the |KWDATA file.
The list of topics to which this keyword refer begins in the |KWDATA file
at that offset.
The records in the leaf pages are stored alphabetically by the keyword
strings.
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