dynamic_library.cpp

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2011 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
 *  others to use your version of this file under the CPAL, indicate your decision by 
 *  deleting the provisions above and replace them with the notice and other 
 *  provisions required by the GPL License. If you do not delete the provisions above,
 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */
 
#include "lass_common.h"
#include "dynamic_library.h"
#include "impl/lass_errno.h"
#include "../stde/extended_string.h"
 
#if LASS_PLATFORM_TYPE == LASS_PLATFORM_TYPE_WIN32
 
#include <windows.h>
 
namespace lass
{
namespace util
{
 
DynamicLibrary::DynamicLibrary(const std::string& path):
    pimpl_(0)
{
    pimpl_ = ::LoadLibrary(path.c_str());
    if (pimpl_ == NULL && !stde::ends_with(path, ".dll") && !stde::ends_with(path, ".pyd"))
    {
        pimpl_ = ::LoadLibrary( (path + ".dll").c_str() );
        if (pimpl_ == NULL)
        {
            pimpl_ = ::LoadLibrary( (path + ".pyd").c_str() );
        }
    }
    if (pimpl_ == NULL)
    {
        LASS_THROW_EX(DynamicLibraryError, "Unable to load '" << path << "': " << impl::lass_FormatMessage(impl::lass_GetLastError()));
    }
}
 
DynamicLibrary::~DynamicLibrary()
{
    LASS_ASSERT(pimpl_);
    ::FreeLibrary(static_cast<HMODULE>(pimpl_));
}
 
DynamicLibrary::TFunctionPtr DynamicLibrary::resolveFunctionImpl(const std::string& functionName) const
{
    LASS_ASSERT(pimpl_);
    TFunctionPtr fun = TFunctionPtr(::GetProcAddress(static_cast<HMODULE>(pimpl_), functionName.c_str()));
    if (!fun)
    {
        LASS_THROW_EX(DynamicLibraryError, "Unable to resolve '" << functionName << "': " << impl::lass_FormatMessage(impl::lass_GetLastError()));
    }
    return fun;
}
 
}
}
 
#elif LASS_HAVE_DLOPEN
 
#include <dlfcn.h>
 
namespace lass
{
namespace util
{
 
DynamicLibrary::DynamicLibrary(const std::string& path):
    pimpl_(0)
{
    const int flags = RTLD_NOW | RTLD_GLOBAL;
    pimpl_ = ::dlopen(path.c_str(), flags);
    if (pimpl_ == NULL && !stde::ends_with(path, ".so"))
    {
        pimpl_ = ::dlopen( (path + ".so").c_str(), flags );
    }
    if (pimpl_ == NULL)
    {
        const char* msg = ::dlerror();
        if (msg)
        {
            LASS_THROW_EX(DynamicLibraryError, msg);
        }
        else
        {
            LASS_THROW_EX(DynamicLibraryError, "Unable to load " << path);
        }
    }
}
 
DynamicLibrary::~DynamicLibrary()
{
    LASS_ASSERT(pimpl_);
    ::dlclose(pimpl_);
}
 
DynamicLibrary::TFunctionPtr DynamicLibrary::resolveFunctionImpl(const std::string& functionName) const
{
    LASS_ASSERT(pimpl_);
    TFunctionPtr fun = ::dlsym(pimpl_, functionName.c_str());
    if (!fun)
    {
        const char* msg = ::dlerror();
        if (msg)
        {
            LASS_THROW_EX(DynamicLibraryError, msg);
        }
        else
        {
            LASS_THROW_EX(DynamicLibraryError, "Unable to resolve " << functionName);
        }
    }
    return fun;
}
 
}
}
 
#else
 
#   pragma LASS_NOTE("no implementation for DynamicLibraryError, it will be unavailable.")
 
#endif
 
// EOF