What compression does Nuklear use for fonts?

[HappyGlitch]

I want to add a font to my project by encoding it in base85 using the function nk_font_atlas_add_compressed_base85. Adding a base85 encoded ttf font in this way results in a segfault, when calling nk_sdl_font_stash_end, which I suppose is because I need to somehow compress the font before encoding it in base85.
Surprisingly this function does not have a non compressed counterpart. I found out it uses a function nk_decompress internally. How should I compress my font, so it can be decompressed using this function? There is no nk_compress.

[HappyGlitch]

I found out Nuklear actually uses a custom mapping for Ascii85, which avoids problematic characters, while being simple to implement. Because of that my code couldn't have been working. I add the mapping below in case it is helpful.

0	#		1	$
2	%		3	&
4	'		5	(
6	)		7	*
8	+		9	,
10	-		11	.
12	/		13	0
14	1		15	2
16	3		17	4
18	5		19	6
20	7		21	8
22	9		23	:
24	;		25	<
26	=		27	>
28	?		29	@
30	A		31	B
32	C		33	D
34	E		35	F
36	G		37	H
38	I		39	J
40	K		41	L
42	M		43	N
44	O		45	P
46	Q		47	R
48	S		49	T
50	U		51	V
52	W		53	X
54	Y		55	Z
56	[		57	]
58	^		59	_
60	`		61	a
62	b		63	c
64	d		65	e
66	f		67	g
68	h		69	i
70	j		71	k
72	l		73	m
74	n		75	o
76	p		77	q
78	r		79	s
80	t		81	u
82	v		83	w
84	x