JSTF Header

The JSTF table begins with a header that contains a version number for the table (Version), a count of the number of scripts used in the font (JstfScriptCount), and an array of records (JstfScriptRecord). Each record contains a script tag (JstfScriptTag) and an offset to a JstfScript table (JstfScript).

Note: The JstfScriptTags must correspond with the ScriptTags listed in the GSUB and GPOS tables.

Example 1 at the end of this chapter shows a JSTF Header table and JstfScriptRecord.

JSTF header

Type	Name	Description
fixed32	Version	Version of the JSTF table
		—initially set to 0x00010000
uint16	JstfScriptCount	Number of JstfScriptRecords in this table
struct	JstfScriptRecord	Array of JstfScriptRecords
	[JstfScriptCount}	—in alphabetical order, by JstfScriptTag

JstfScriptRecord

Type	Name	Description
Tag	JstfScriptTag	4-byte JstfScript identification
Offset	JstfScript	Offset to JstfScript table
		—from beginning of JSTF Header