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[aat] Embed a sanitizer context in hb_aat_apply_context_t 

For run-time checking.
This commit is contained in:
Behdad Esfahbod 2018-01-19 16:52:01 -08:00
parent 046690a4df
commit f07ce661a2
2 changed files with 24 additions and 14 deletions
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18
src/hb-aat-layout-common-private.hh
View File

@ -704,13 +704,23 @@ struct hb_aat_apply_context_t :
hb_font_t *font;
hb_face_t *face;
hb_buffer_t *buffer;
const char *end;
hb_sanitize_context_t sanitizer;
hb_aat_apply_context_t (hb_font_t *font_,
inline hb_aat_apply_context_t (hb_font_t *font_,
hb_buffer_t *buffer_,
const char *end_) :
hb_blob_t *table) :
font (font_), face (font->face), buffer (buffer_),
end (end_) {}
sanitizer ()
{
sanitizer.init (table);
sanitizer.num_glyphs = face->get_num_glyphs ();
sanitizer.start_processing ();
}
inline ~hb_aat_apply_context_t (void)
{
sanitizer.end_processing ();
}
};

16
src/hb-aat-layout.cc
View File

@ -37,19 +37,19 @@
*/
static inline const AAT::morx&
_get_morx (hb_face_t *face, unsigned int *length = nullptr)
_get_morx (hb_face_t *face, hb_blob_t **blob = nullptr)
{
if (unlikely (!hb_ot_shaper_face_data_ensure (face)))
{
if (length)
*length = 0;
if (blob)
*blob = hb_blob_get_empty ();
return OT::Null(AAT::morx);
}
hb_ot_layout_t * layout = hb_ot_layout_from_face (face);
/* XXX this doesn't call set_num_glyphs on sanitizer. */
const AAT::morx& morx = *(layout->morx.get ());
if (length)
*length = hb_blob_get_length (layout->morx.blob);
if (blob)
*blob = layout->morx.blob;
return morx;
}
@ -70,9 +70,9 @@ _hb_aat_layout_create (hb_face_t *face)
void
hb_aat_layout_substitute (hb_font_t *font, hb_buffer_t *buffer)
{
unsigned int length;
const AAT::morx& morx = _get_morx (font->face, &length);
hb_blob_t *blob;
const AAT::morx& morx = _get_morx (font->face, &blob);
AAT::hb_aat_apply_context_t c (font, buffer, (const char *) &morx + length);
AAT::hb_aat_apply_context_t c (font, buffer, blob);
morx.apply (&c);
}