dolphin/Source/Core/Common/Src/DynamicLibrary.cpp

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// Copyright (C) 2003-2008 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include <string.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <dlfcn.h>
#include <stdio.h>
#endif
#include "Common.h"
#include "FileUtil.h"
#include "StringUtil.h"
#include "DynamicLibrary.h"
DynamicLibrary::DynamicLibrary()
{
library = 0;
}
std::string GetLastErrorAsString()
{
#ifdef _WIN32
LPVOID lpMsgBuf = 0;
DWORD error = GetLastError();
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
error,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0, NULL);
std::string s;
if (lpMsgBuf)
{
s = ((char *)lpMsgBuf);
LocalFree(lpMsgBuf);
} else {
s = StringFromFormat("(unknown error %08x)", error);
}
return s;
#else
static std::string errstr;
char *tmp = dlerror();
if (tmp)
errstr = tmp;
return errstr;
#endif
}
// Loading means loading the dll with LoadLibrary() to get an instance to the dll.
// This is done when Dolphin is started to determine which dlls are good, and
// before opening the Config and Debugging windows from Plugin.cpp and
// before opening the dll for running the emulation in Video_...cpp in Core.
// Since this is fairly slow, TODO: think about implementing some sort of cache.
int DynamicLibrary::Load(const char* filename)
{
if (!filename || strlen(filename) == 0)
{
LOG(MASTER_LOG, "Missing filename of dynamic library to load");
PanicAlert("Missing filename of dynamic library to load");
return 0;
}
LOG(MASTER_LOG, "Trying to load library %s", filename);
if (IsLoaded())
{
LOG(MASTER_LOG, "Trying to load already loaded library %s", filename);
return 2;
}
#ifdef _WIN32
library = LoadLibrary(filename);
#else
library = dlopen(filename, RTLD_NOW | RTLD_LOCAL);
#endif
if (!library)
{
LOG(MASTER_LOG, "Error loading DLL %s: %s", filename, GetLastErrorAsString().c_str());
if (File::Exists(filename))
{
PanicAlert("Error loading DLL %s: %s\n\nAre you missing SDL.DLL or another file that this plugin may depend on?", filename, GetLastErrorAsString().c_str());
}
else
{
PanicAlert("Error loading DLL %s: %s\n", filename, GetLastErrorAsString().c_str());
}
return 0;
}
library_file = filename;
return 1;
}
int DynamicLibrary::Unload()
{
int retval;
if (!IsLoaded()) {
PanicAlert("Error unloading DLL %s: not loaded", library_file.c_str());
return 0;
}
#ifdef _WIN32
retval = FreeLibrary(library);
#else
retval = dlclose(library)?0:1;
#endif
if (!retval) {
PanicAlert("Error unloading DLL %s: %s", library_file.c_str(),
GetLastErrorAsString().c_str());
}
library = 0;
return retval;
}
void* DynamicLibrary::Get(const char* funcname) const
{
void* retval;
if (!library)
{
PanicAlert("Can't find function %s - Library not loaded.");
return NULL;
}
#ifdef _WIN32
retval = GetProcAddress(library, funcname);
#else
retval = dlsym(library, funcname);
#endif
if (!retval) {
LOG(MASTER_LOG, "Symbol %s missing in %s (error: %s)\n", funcname, library_file.c_str(), GetLastErrorAsString().c_str());
PanicAlert("Symbol %s missing in %s (error: %s)\n", funcname, library_file.c_str(), GetLastErrorAsString().c_str());
}
return retval;
}