todo

ttfdump源代码

v. 0.45
glyf.c:
	how to deal with zero contours and zero instructions ??
cmap.c:
	format 2 4 6
post.c:
	format 2.0 ,2.5 
os2 table

table init methods are not implemented
modify Makefile
remove possibel memory leak by dmalloc
check the program by lint
problem:
	the various tables have interdependency with each other, how can we de-couple them ??
	should the table init method load the entries of each table ?? or just return a memory
	space ??
	should we change the interface from xxxYYYZZZ(file,ZZZ,ofset) into 
	xxxYYYZZZ(TTFontPtr font) ??
v 0.5
try to port to different machine
use autoconf
optional tables

instruction dissasembler
instruction interpreter
final layer of abstraction for TTFont structure

glyph and bitmap buffer cache