1 #include "hb-fuzzer.hh"
2
3 #include <stdlib.h>
4 #include <stdio.h>
5 #include <string.h>
6
7 #include "hb-subset.h"
8
9 static void
trySubset(hb_face_t * face,const hb_codepoint_t text[],int text_length,bool drop_hints,bool drop_layout,bool retain_gids)10 trySubset (hb_face_t *face,
11 const hb_codepoint_t text[],
12 int text_length,
13 bool drop_hints,
14 bool drop_layout,
15 bool retain_gids)
16 {
17 hb_subset_input_t *input = hb_subset_input_create_or_fail ();
18 hb_subset_input_set_drop_hints (input, drop_hints);
19 hb_subset_input_set_retain_gids (input, retain_gids);
20 hb_set_t *codepoints = hb_subset_input_unicode_set (input);
21
22 if (!drop_layout)
23 {
24 hb_set_del (hb_subset_input_drop_tables_set (input), HB_TAG ('G', 'S', 'U', 'B'));
25 hb_set_del (hb_subset_input_drop_tables_set (input), HB_TAG ('G', 'P', 'O', 'S'));
26 hb_set_del (hb_subset_input_drop_tables_set (input), HB_TAG ('G', 'D', 'E', 'F'));
27 }
28
29 for (int i = 0; i < text_length; i++)
30 {
31 hb_set_add (codepoints, text[i]);
32 }
33
34 hb_face_t *result = hb_subset (face, input);
35 hb_face_destroy (result);
36
37 hb_subset_input_destroy (input);
38 }
39
40 static void
trySubset(hb_face_t * face,const hb_codepoint_t text[],int text_length,const uint8_t flags[1])41 trySubset (hb_face_t *face,
42 const hb_codepoint_t text[],
43 int text_length,
44 const uint8_t flags[1])
45 {
46 bool drop_hints = flags[0] & (1 << 0);
47 bool drop_layout = flags[0] & (1 << 1);
48 bool retain_gids = flags[0] & (1 << 2);
49 trySubset (face, text, text_length,
50 drop_hints, drop_layout, retain_gids);
51 }
52
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)53 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
54 {
55 hb_blob_t *blob = hb_blob_create ((const char *)data, size,
56 HB_MEMORY_MODE_READONLY, nullptr, nullptr);
57 hb_face_t *face = hb_face_create (blob, 0);
58
59 /* Just test this API here quickly. */
60 hb_set_t *output = hb_set_create();
61 hb_face_collect_unicodes (face, output);
62 hb_set_destroy (output);
63
64 uint8_t flags[1] = {0};
65 const hb_codepoint_t text[] =
66 {
67 'A', 'B', 'C', 'D', 'E', 'X', 'Y', 'Z', '1', '2',
68 '3', '@', '_', '%', '&', ')', '*', '$', '!'
69 };
70
71 trySubset (face, text, sizeof (text) / sizeof (hb_codepoint_t), flags);
72
73 hb_codepoint_t text_from_data[16];
74 if (size > sizeof(text_from_data) + sizeof(flags)) {
75 memcpy (text_from_data,
76 data + size - sizeof(text_from_data),
77 sizeof(text_from_data));
78
79 memcpy (flags,
80 data + size - sizeof(text_from_data) - sizeof(flags),
81 sizeof(flags));
82 unsigned int text_size = sizeof (text_from_data) / sizeof (hb_codepoint_t);
83
84 trySubset (face, text_from_data, text_size, flags);
85 }
86
87 hb_face_destroy (face);
88 hb_blob_destroy (blob);
89
90 return 0;
91 }
92