1 #include "hb-fuzzer.hh"
2
3 #include <stdlib.h>
4 #include <stdio.h>
5 #include <string.h>
6 #include <assert.h>
7
8 #include "hb-subset.h"
9
10 static void
trySubset(hb_face_t * face,const hb_codepoint_t text[],int text_length,unsigned flag_bits)11 trySubset (hb_face_t *face,
12 const hb_codepoint_t text[],
13 int text_length,
14 unsigned flag_bits)
15 {
16 hb_subset_input_t *input = hb_subset_input_create_or_fail ();
17 if (!input) return;
18
19 hb_subset_input_set_flags (input, (hb_subset_flags_t) flag_bits);
20
21 hb_set_t *codepoints = hb_subset_input_unicode_set (input);
22
23 for (int i = 0; i < text_length; i++)
24 hb_set_add (codepoints, text[i]);
25
26 hb_face_t *result = hb_subset_or_fail (face, input);
27 if (result)
28 {
29 hb_blob_t *blob = hb_face_reference_blob (result);
30 unsigned int length;
31 const char *data = hb_blob_get_data (blob, &length);
32
33 // Something not optimizable just to access all the blob data
34 unsigned int bytes_count = 0;
35 for (unsigned int i = 0; i < length; ++i)
36 if (data[i]) ++bytes_count;
37 assert (bytes_count || !length);
38
39 hb_blob_destroy (blob);
40 }
41 hb_face_destroy (result);
42
43 hb_subset_input_destroy (input);
44 }
45
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)46 extern "C" int LLVMFuzzerTestOneInput (const uint8_t *data, size_t size)
47 {
48 alloc_state = size; /* see src/failing-alloc.c */
49
50 hb_blob_t *blob = hb_blob_create ((const char *) data, size,
51 HB_MEMORY_MODE_READONLY, nullptr, nullptr);
52 hb_face_t *face = hb_face_create (blob, 0);
53
54 /* Just test this API here quickly. */
55 hb_set_t *output = hb_set_create ();
56 hb_face_collect_unicodes (face, output);
57 hb_set_destroy (output);
58
59 unsigned flags = HB_SUBSET_FLAGS_DEFAULT;
60 const hb_codepoint_t text[] =
61 {
62 'A', 'B', 'C', 'D', 'E', 'X', 'Y', 'Z', '1', '2',
63 '3', '@', '_', '%', '&', ')', '*', '$', '!'
64 };
65
66 trySubset (face, text, sizeof (text) / sizeof (hb_codepoint_t), flags);
67
68 hb_codepoint_t text_from_data[16];
69 if (size > sizeof (text_from_data) + sizeof (flags)) {
70 memcpy (text_from_data,
71 data + size - sizeof (text_from_data),
72 sizeof (text_from_data));
73
74 memcpy (&flags,
75 data + size - sizeof (text_from_data) - sizeof (flags),
76 sizeof (flags));
77 unsigned int text_size = sizeof (text_from_data) / sizeof (hb_codepoint_t);
78
79 trySubset (face, text_from_data, text_size, flags);
80 }
81
82 hb_face_destroy (face);
83 hb_blob_destroy (blob);
84
85 return 0;
86 }
87