The Charset maps glyph identifiers to string identifiers.

The string identifiers can then be used as indices into the string INDEX to get the actual name of a glyph.

Decode a Charset. The offset is (a)bused to indicate use of a predefined charset

• offset = 0: the ISOAdobe charset will be used
• offset = 1: the Expert charset will be used
• offset = 2: the ExpertSubset charset will be used
• otherwise the charset has to be decoded

When a predefined charset is used the charset is not encoded.

Find the string identifier for a glyph identifier.