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for help.
## Usage
+
+TrueType and OpenType fonts consist of a sequence of tables and various
+informations about the font are encoded in these tables. There are both
+required and optional tables. The first table is a font directory and it
+describes the overall structure of the font, what tables it contains and at what
+offset other tables can be found.
+
+This library doesn't parse the whole font at once. The font directory has to be
+parsed first and can be used then to parse further tables as needed.