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      1 /*-------------------------------------------------------------------------
      2  * drawElements Utility Library
      3  * ----------------------------
      4  *
      5  * Copyright 2014 The Android Open Source Project
      6  *
      7  * Licensed under the Apache License, Version 2.0 (the "License");
      8  * you may not use this file except in compliance with the License.
      9  * You may obtain a copy of the License at
     10  *
     11  *      http://www.apache.org/licenses/LICENSE-2.0
     12  *
     13  * Unless required by applicable law or agreed to in writing, software
     14  * distributed under the License is distributed on an "AS IS" BASIS,
     15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     16  * See the License for the specific language governing permissions and
     17  * limitations under the License.
     18  *
     19  *//*!
     20  * \file
     21  * \brief Dynamic link library abstraction.
     22  *//*--------------------------------------------------------------------*/
     23 
     24 #include "deDynamicLibrary.h"
     25 #include "deMemory.h"
     26 
     27 #if (DE_OS == DE_OS_UNIX) || (DE_OS == DE_OS_ANDROID) || (DE_OS == DE_OS_OSX) || (DE_OS == DE_OS_SYMBIAN) || (DE_OS == DE_OS_IOS) || (DE_OS == DE_OS_QNX)
     28 /* Posix implementation. */
     29 
     30 #include <dlfcn.h>
     31 
     32 struct deDynamicLibrary_s
     33 {
     34 	void*	libHandle;
     35 };
     36 
     37 deDynamicLibrary* deDynamicLibrary_open (const char* fileName)
     38 {
     39 	deDynamicLibrary* library = (deDynamicLibrary*)deCalloc(sizeof(deDynamicLibrary));
     40 	if (!library)
     41 		return DE_NULL;
     42 
     43 	library->libHandle = dlopen(fileName, RTLD_LAZY);
     44 	if (!library->libHandle)
     45 	{
     46 		deFree(library);
     47 		return DE_NULL;
     48 	}
     49 
     50 	return library;
     51 }
     52 
     53 void deDynamicLibrary_close (deDynamicLibrary* library)
     54 {
     55 	if (library && library->libHandle)
     56 		dlclose(library->libHandle);
     57 	deFree(library);
     58 }
     59 
     60 deFunctionPtr deDynamicLibrary_getFunction (const deDynamicLibrary* library, const char* symbolName)
     61 {
     62 	/* C forbids direct cast from object pointer to function pointer */
     63 	union
     64 	{
     65 		deFunctionPtr	funcPtr;
     66 		void*			objPtr;
     67 	} ptr;
     68 
     69 	DE_ASSERT(library && library->libHandle && symbolName);
     70 	ptr.objPtr = dlsym(library->libHandle, symbolName);
     71 	return ptr.funcPtr;
     72 }
     73 
     74 #elif (DE_OS == DE_OS_WIN32)
     75 /* Win32 implementation. */
     76 
     77 #define WIN32_LEAN_AND_MEAN
     78 #define VC_EXTRALEAN
     79 #include <windows.h>
     80 
     81 struct deDynamicLibrary_s
     82 {
     83 	HINSTANCE	handle;
     84 };
     85 
     86 deDynamicLibrary* deDynamicLibrary_open (const char* fileName)
     87 {
     88 	deDynamicLibrary* library = (deDynamicLibrary*)deCalloc(sizeof(deDynamicLibrary));
     89 	if (!library)
     90 		return DE_NULL;
     91 
     92 	library->handle = LoadLibrary(fileName);
     93 	if (!library->handle)
     94 	{
     95 		deFree(library);
     96 		return DE_NULL;
     97 	}
     98 
     99 	return library;
    100 }
    101 
    102 void deDynamicLibrary_close (deDynamicLibrary* library)
    103 {
    104 	if (library && library->handle)
    105 		FreeLibrary(library->handle);
    106 	deFree(library);
    107 }
    108 
    109 deFunctionPtr deDynamicLibrary_getFunction (const deDynamicLibrary* library, const char* symbolName)
    110 {
    111 	DE_ASSERT(library && library->handle && symbolName);
    112 	return (deFunctionPtr)GetProcAddress(library->handle, symbolName);
    113 }
    114 
    115 #else
    116 #	error deDynamicLibrary is not implemented on this OS
    117 #endif
    118