return (OPJ_INT32)(temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) ;
}
+/**
+Addition two signed integers with a wrap-around behaviour.
+Assumes complement-to-two signed integers.
+@param a
+@param b
+@return Returns a + b
+*/
+static INLINE OPJ_INT32 opj_int_add_no_overflow(OPJ_INT32 a, OPJ_INT32 b)
+{
+ void* pa = &a;
+ void* pb = &b;
+ OPJ_UINT32* upa = (OPJ_UINT32*)pa;
+ OPJ_UINT32* upb = (OPJ_UINT32*)pb;
+ OPJ_UINT32 ures = *upa + *upb;
+ void* pures = &ures;
+ OPJ_INT32* ipres = (OPJ_INT32*)pures;
+ return *ipres;
+}
+
+/**
+Subtract two signed integers with a wrap-around behaviour.
+Assumes complement-to-two signed integers.
+@param a
+@param b
+@return Returns a - b
+*/
+static INLINE OPJ_INT32 opj_int_sub_no_overflow(OPJ_INT32 a, OPJ_INT32 b)
+{
+ void* pa = &a;
+ void* pb = &b;
+ OPJ_UINT32* upa = (OPJ_UINT32*)pa;
+ OPJ_UINT32* upb = (OPJ_UINT32*)pb;
+ OPJ_UINT32 ures = *upa - *upb;
+ void* pures = &ures;
+ OPJ_INT32* ipres = (OPJ_INT32*)pures;
+ return *ipres;
+}
+
/* ----------------------------------------------------------------------- */
/*@}*/