.DOC File Format – Styles and fonts

Word 97–2003 document

The style sheet and the font table are both in the table stream, located by the FIB pairs Stshf and SttbfFfn.

The style sheet (STSH)

  1. cbStshithe size of the Stshi2
  2. Stshithe count of styles, the size of each style’s base, default fontscbStshi
  3. LPStdfor each style: a 16-bit size (0 for an unused slot), then a STDrepeats
The style sheet. A paragraph refers to a style by its index, the istd.

The first fields of Stshi are cstd, the number of styles, at offset 0, and cbSTDBaseInFile, the size of the fixed part of each STD, at offset 2. An istd of 0 is the Normal style, and the built-in Heading 1 to 9 styles are at istd 1 to 9.

A style (STD)

OffsetSizeFieldMeaning
02sti, bits 0–11A built-in style number, or 4094 for a user’s own style
22stk, bits 0–3; istdBase, bits 4–15The kind (1 paragraph, 2 character, 3 table, 4 list) and the style this one is based on
42istdNext, bits 4–15The style of the paragraph that follows
62bchUpeThe size of the whole STD
82flagsSuch as whether it shows in lists
cbSTDBaseInFilevariesnameA 16-bit count, the characters in UTF-16LE, and a zero
aftervariesUPXThe properties of the style: grpprls of paragraph and character properties, each with a 16-bit size

The file explorer lists the styles; style-based bold and italic on the styles themselves are not interpreted.

The font table (SttbfFfn)

  1. cDatathe number of fonts2
  2. cbExtra02
  3. cbFfnthe size of each font record, one byte, then the FFNrepeats
The font table.

An FFN is a flags byte (the font family), a 16-bit weight, a character set, a byte ixchSzAlt, PANOSE (10 bytes), font signature (24 bytes), and then the font name in UTF-16LE, ended by a zero and optionally followed by an alternate name.