DynamicLibrary.cpp

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// DynamicLibrary.cpp

#include "DynamicLibrary.h"

// ctor that loads shared lib
DynamicLibrary::DynamicLibrary(const char *libName) : libHandle(NULL)
{
        Load(libName);
}

DynamicLibrary::~DynamicLibrary()
{
        Unload();
}

// load and unload member methods
bool DynamicLibrary::Load(const char *libName)
{
        if (libName != NULL && std::strlen(libName) > 0)
                if (libHandle == NULL)
                        libHandle = ::dlopen( libName, RTLD_LAZY );

        return (libHandle != NULL);
}

bool DynamicLibrary::Unload()
{
        if (libHandle != NULL)
                ::dlclose( libHandle );

        libHandle = NULL;
        cache.clear();
        return true;
}

// cached and uncached access to functions in dynamic lib
DLPROC DynamicLibrary::GetProcAddr(const char *procName) const
{
        DLPROC proc = NULL;
        if (libHandle != NULL)
                proc = (DLPROC) ::dlsym(libHandle, procName);
        return proc;
}

DLPROC DynamicLibrary::GetProcAddrCached(const char *procName, size_t procId)
{
        DLPROC proc = NULL;
        if (libHandle != NULL) {
                if ((procId >= cache.size()) || (cache.size() < 1))
                        cache.resize(procId + 1, cache_info());
                cache_info &ci = cache[ procId ];
                if (ci.procAddr == NULL && !ci.testFlag) {
                        ci.testFlag = true;
                        ci.procAddr = GetProcAddr(procName);
                }
                proc = ci.procAddr;
        }
        return proc;
}

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