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[HB] More sanitize infrastructure

This commit is contained in:
Behdad Esfahbod 2009-08-04 15:28:49 -04:00
parent b508e5ccd5
commit b1e187fc63
1 changed files with 28 additions and 1 deletions
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29
src/hb-open-types-private.hh
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@ -59,9 +59,36 @@ typedef struct _hb_sanitize_context_t hb_sanitize_context_t;
struct _hb_sanitize_context_t
{
const char *start, *end;
int edit_count;
hb_blob_t *blob;
};
static HB_GNUC_UNUSED void
hb_sanitize_init (hb_sanitize_context_t *context,
hb_blob_t *blob)
{
context->blob = blob;
context->start = hb_blob_lock (blob);
context->end = context->start + hb_blob_get_length (blob);
context->edit_count = 0;
}
static HB_GNUC_UNUSED void
hb_sanitize_fini (hb_sanitize_context_t *context, bool unlock)
{
if (unlock)
hb_blob_unlock (context->blob);
}
static HB_GNUC_UNUSED bool
hb_sanitize_edit (hb_sanitize_context_t *context)
{
bool perm = hb_blob_try_writeable_inplace (context->blob);
if (perm)
context->edit_count++;
return perm;
}
#define SANITIZE_ARG_DEF \
hb_sanitize_context_t *context
#define SANITIZE_ARG \
@ -83,7 +110,7 @@ struct _hb_sanitize_context_t
#define SANITIZE_MEM(B,L) HB_LIKELY (context->start <= CONST_CHARP(B) && CONST_CHARP(B) + (L) <= context->end) /* XXX overflow */
#define NEUTER(Var, Val) (SANITIZE_OBJ (Var) && hb_blob_try_writeable_inplace (context->blob) && ((Var) = (Val), true))
#define NEUTER(Var, Val) (SANITIZE_OBJ (Var) && hb_sanitize_edit (context) && ((Var) = (Val), true))
/*