Substrate.hpp

   1 /* Cydia - iPhone UIKit Front-End for Debian APT
   2  * Copyright (C) 2008-2013  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU General Public License, Version 3 {{{ */
   6 /*
   7  * Cydia is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 3 of the License,
  10  * or (at your option) any later version.
  11  *
  12  * Cydia is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with Cydia.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #ifndef Substrate_HPP
  23 #define Substrate_HPP
  24
  25 #include <objc/runtime.h>
  26
  27 template <typename Type_>
  28 static inline Type_ &MSHookIvar(id self, const char *name) {
  29     Ivar ivar(class_getInstanceVariable(object_getClass(self), name));
  30     void *pointer(ivar == NULL ? NULL : reinterpret_cast<char *>(self) + ivar_getOffset(ivar));
  31     return *reinterpret_cast<Type_ *>(pointer);
  32 }
  33
  34 #define MSClassHook(name) \
  35     @class name; \
  36     static Class $ ## name = objc_getClass(#name);
  37
  38 #define MSHook(type, name, args...) \
  39     static type (*_ ## name)(args); \
  40     static type $ ## name(args)
  41
  42 #define CYHook(Type, Code, Name) \
  43 static struct Type ## $ ## Code { Type ## $ ## Code() { \
  44     Method Type ## $ ## Code(class_getInstanceMethod($ ## Type, @selector(Name))); \
  45     if (Type ## $ ## Code != NULL) { \
  46         _ ## Type ## $ ## Code = reinterpret_cast<decltype(_ ## Type ## $ ## Code)>(method_getImplementation(Type ## $ ## Code)); \
  47         method_setImplementation(Type ## $ ## Code, reinterpret_cast<IMP>(&$ ## Type ## $ ## Code)); \
  48     } \
  49 } } Type ## $ ## Code;
  50
  51 #endif//Substrate_HPP