commit 738c54d9caa3affc4b434e56bfb810ff6dc9b0b3
author Behdad Esfahbod <behdad@behdad.org> Tue Aug 04 14:42:46 2009 -0400
committer Behdad Esfahbod <behdad@behdad.org> Mon Nov 02 14:40:29 2009 -0500
tree f10057dec718e3c791b17bb295b296aca65157b2
parent e49a84c9e37c08808880e74e94c8160731ababa1

[HB] Tag sanitize()

src/hb-open-types-private.hh

diff --git a/src/hb-open-types-private.hh b/src/hb-open-types-private.hh
index 8e325d7..d923b88 100644
--- a/src/hb-open-types-private.hh
+++ b/src/hb-open-types-private.hh
@@ -282,6 +282,14 @@
   /* What the char* converters return is NOT nul-terminated.  Print using "%.4s" */
   inline operator const char* (void) const { return CONST_CHARP(this); }
   inline operator char* (void) { return CHARP(this); }
+
+  inline bool sanitize (SANITIZE_ARG_DEF) {
+    /* Note: Only accept ASCII-visible tags (mind DEL)
+     * This is one of the few times (only time?) we check
+     * for data integrity, as opposed o just boundary checks
+     */
+    return SANITIZE_SELF () && (((uint32_t) *this) & 0x80808080) == 0;
+  }
 };
 ASSERT_SIZE (Tag, 4);
 #define _NULL_TAG_INIT  {' ', ' ', ' ', ' '}