added plugin support

2 files changed, 314 insertions, 0 deletions

diff --git a/Source/cmDynamicLoader.cxx b/Source/cmDynamicLoader.cxx
new file mode 100644
index 0000000..321faf0
--- /dev/null
+++ b/Source/cmDynamicLoader.cxx
@@ -0,0 +1,234 @@
+/*=========================================================================
+
+  Program:   Insight Segmentation & Registration Toolkit
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Insight Consortium. All rights reserved.
+  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#include "cmDynamicLoader.h"
+
+// This file is actually 3 different implementations.
+// 1. HP machines which uses shl_load
+// 2. Apple OSX which uses NSLinkModule
+// 3. Windows which uses LoadLibrary
+// 4. Most unix systems which use dlopen (default )
+// Each part of the ifdef contains a complete implementation for
+// the static methods of cmDynamicLoader.  
+
+// ---------------------------------------------------------------
+// 1. Implementation for HPUX  machines
+#ifdef __hpux
+#define CMDYNAMICLOADER_DEFINED 1
+#include <dl.h>
+
+cmLibHandle cmDynamicLoader::OpenLibrary(const char* libname )
+{
+  return shl_load(libname, BIND_DEFERRED | DYNAMIC_PATH, 0L);
+}
+
+int cmDynamicLoader::CloseLibrary(cmLibHandle lib)
+{
+  return 0;
+}
+
+void* cmDynamicLoader::GetSymbolAddress(cmLibHandle lib, const char* sym)
+{ 
+  void* addr;
+  int status;
+  
+  status = shl_findsym (&lib, sym, TYPE_PROCEDURE, &addr);
+  return (status < 0) ? (void*)0 : addr;
+}
+
+const char* cmDynamicLoader::LibPrefix()
+{ 
+  return "lib";
+}
+
+const char* cmDynamicLoader::LibExtension()
+{
+  return ".sl";
+}
+
+const char* cmDynamicLoader::LastError()
+{
+  return 0;
+}
+#endif
+
+
+
+// ---------------------------------------------------------------
+// 2. Implementation for Darwin (including OSX) Machines
+
+#ifdef __APPLE__
+#define CMDYNAMICLOADER_DEFINED
+#include <mach-o/dyld.h>
+
+cmLibHandle cmDynamicLoader::OpenLibrary(const char* libname )
+{
+  NSObjectFileImageReturnCode rc;
+  NSObjectFileImage image;
+
+  rc = NSCreateObjectFileImageFromFile(libname, &image);
+  return NSLinkModule(image, libname, TRUE);
+}
+
+int cmDynamicLoader::CloseLibrary(cmLibHandle lib)
+{
+  return 0;
+}
+
+void* cmDynamicLoader::GetSymbolAddress(cmLibHandle lib, const char* sym)
+{
+    void *result=0;
+    if(NSIsSymbolNameDefined(sym)){
+         cout << sym << " is defined!" << endl;
+         NSSymbol symbol= NSLookupAndBindSymbol(sym);
+         if(symbol){
+                result = NSAddressOfSymbol(symbol);
+         }
+  }else{
+        cout << sym << " is not defined!" << endl;
+ }
+  return result;
+}
+
+const char* cmDynamicLoader::LibPrefix()
+{
+  return "";
+}
+
+const char* cmDynamicLoader::LibExtension()
+{
+  return ".dylib";
+}
+
+const char* cmDynamicLoader::LastError()
+{
+  return 0;
+}
+
+#endif
+
+
+
+
+// ---------------------------------------------------------------
+// 3. Implementation for Windows win32 code
+#ifdef _WIN32
+#include <windows.h>
+#define CMDYNAMICLOADER_DEFINED 1
+
+cmLibHandle cmDynamicLoader::OpenLibrary(const char* libname )
+{
+#ifdef UNICODE
+        wchar_t *libn = new wchar_t [mbstowcs(NULL, libname, 32000)];
+        mbstowcs(libn, libname, 32000);
+        cmLibHandle ret = LoadLibrary(libn);
+        delete [] libn;
+        return ret;
+#else
+        return LoadLibrary(libname);
+#endif
+}
+
+int cmDynamicLoader::CloseLibrary(cmLibHandle lib)
+{
+  return (int)FreeLibrary(lib);
+}
+
+void* cmDynamicLoader::GetSymbolAddress(cmLibHandle lib, const char* sym)
+{ 
+#ifdef UNICODE
+        wchar_t *wsym = new wchar_t [mbstowcs(NULL, sym, 32000)];
+        mbstowcs(wsym, sym, 32000);
+        void *ret = GetProcAddress(lib, wsym);
+        delete [] wsym;
+        return ret;
+#else
+  return GetProcAddress(lib, sym);
+#endif
+}
+
+const char* cmDynamicLoader::LibPrefix()
+{ 
+  return "";
+}
+
+const char* cmDynamicLoader::LibExtension()
+{
+  return ".dll";
+}
+
+const char* cmDynamicLoader::LastError()
+{
+  LPVOID lpMsgBuf;
+
+  FormatMessage( 
+                FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+                NULL,
+                GetLastError(),
+                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+                (LPTSTR) &lpMsgBuf,
+                0,
+                NULL 
+                );
+  
+  // Free the buffer.
+  LocalFree( lpMsgBuf );
+  static char* str = 0;
+  delete [] str;
+  str = strcpy(new char[strlen((char*)lpMsgBuf)+1], (char*)lpMsgBuf);
+  return str;
+}
+
+#endif
+
+// ---------------------------------------------------------------
+// 4. Implementation for default UNIX machines.
+// if nothing has been defined then use this
+#ifndef CMDYNAMICLOADER_DEFINED
+#define CMDYNAMICLOADER_DEFINED
+// Setup for most unix machines
+#include <dlfcn.h>
+
+cmLibHandle cmDynamicLoader::OpenLibrary(const char* libname )
+{
+  return dlopen(libname, RTLD_LAZY);
+}
+
+int cmDynamicLoader::CloseLibrary(cmLibHandle lib)
+{
+  return (int)dlclose(lib);
+}
+
+void* cmDynamicLoader::GetSymbolAddress(cmLibHandle lib, const char* sym)
+{ 
+  return dlsym(lib, sym);
+}
+
+const char* cmDynamicLoader::LibPrefix()
+{ 
+  return "lib";
+}
+
+const char* cmDynamicLoader::LibExtension()
+{
+  return ".so";
+}
+
+const char* cmDynamicLoader::LastError()
+{
+  return dlerror(); 
+}
+#endif
diff --git a/Source/cmDynamicLoader.h b/Source/cmDynamicLoader.h
new file mode 100644
index 0000000..d5cc612
--- /dev/null
+++ b/Source/cmDynamicLoader.h
@@ -0,0 +1,80 @@
+/*=========================================================================
+
+  Program:   Insight Segmentation & Registration Toolkit
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Insight Consortium. All rights reserved.
+  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+// .NAME cmDynamicLoader - class interface to system dynamic libraries
+// .SECTION Description
+// cmDynamicLoader provides a portable interface to loading dynamic 
+// libraries into a process.  
+
+
+#ifndef __cmDynamicLoader_h
+#define __cmDynamicLoader_h
+
+#include "cmStandardIncludes.h"
+
+// Ugly stuff for library handles
+// They are different on several different OS's
+#if defined(__hpux)
+# include <dl.h>
+  typedef shl_t cmLibHandle;
+#elif defined(_WIN32)
+  #include <windows.h>
+  typedef HMODULE cmLibHandle;
+#else
+  typedef void* cmLibHandle;
+#endif
+
+class cmDynamicLoader
+{
+public:
+  // Description:
+  // Load a dynamic library into the current process.
+  // The returned cmLibHandle can be used to access the symbols in the 
+  // library.
+  static cmLibHandle OpenLibrary(const char*);
+
+  // Description:
+  // Attempt to detach a dynamic library from the
+  // process.  A value of true is returned if it is successful.
+  static int CloseLibrary(cmLibHandle);
+  
+  // Description:
+  // Find the address of the symbol in the given library
+  static void* GetSymbolAddress(cmLibHandle, const char*);
+
+  // Description:
+  // Return the library prefix for the given architecture
+  static const char* LibPrefix();
+
+  // Description:
+  // Return the library extension for the given architecture
+  static const char* LibExtension();
+
+  // Description:
+  // Return the last error produced from a calls made on this class.
+  static const char* LastError();
+  
+protected:
+  cmDynamicLoader() {};
+  ~cmDynamicLoader() {};
+
+  
+private:
+  cmDynamicLoader(const cmDynamicLoader&);  // Not implemented.
+  void operator=(const cmDynamicLoader&);  // Not implemented.
+};
+
+#endif