/** Implementation of NSBundle class
   Copyright (C) 1993-2002 Free Software Foundation, Inc.

   Written by:  Adam Fedor <fedor@boulder.colorado.edu>
   Date: May 1993

   Author: Mirko Viviani <mirko.viviani@rccr.cremona.it>
   Date: October 2000  Added frameworks support

   Author: Nicola Pero <nicola@brainstorm.co.uk>

   This file is part of the GNUstep Base Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.


   <title>NSBundle class reference</title>
   $Date$ $Revision$
*/

#include <config.h>
#include <base/preface.h>
#include <Foundation/objc-load.h>
#include <Foundation/NSBundle.h>
#include <Foundation/NSException.h>
#include <Foundation/NSString.h>
#include <Foundation/NSArray.h>
#include <Foundation/NSDebug.h>
#include <Foundation/NSDictionary.h>
#include <Foundation/NSProcessInfo.h>
#include <Foundation/NSObjCRuntime.h>
#include <Foundation/NSUserDefaults.h>
#include <Foundation/NSNotification.h>
#include <Foundation/NSLock.h>
#include <Foundation/NSMapTable.h>
#include <Foundation/NSAutoreleasePool.h>
#include <Foundation/NSFileManager.h>
#include <Foundation/NSPathUtilities.h>
#include <Foundation/NSValue.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>

@interface NSObject (PrivateFrameworks)
+ (NSString*) frameworkEnv;
+ (NSString*) frameworkPath;
+ (NSString*) frameworkVersion;
+ (NSString**) frameworkClasses;
@end

typedef enum {
  NSBUNDLE_BUNDLE = 1, NSBUNDLE_APPLICATION, NSBUNDLE_FRAMEWORK
} bundle_t;

/* Class variables - We keep track of all the bundles */
static NSBundle		*_mainBundle = nil;
static NSMapTable	*_bundles = NULL;

/* Keep the path to the executable file for finding the main bundle. */
static NSString	*_executable_path;

/*
 * An empty strings file table for use when localization files can't be found.
 */
static NSDictionary	*_emptyTable = nil;

/* When we are linking in an object file, objc_load_modules calls our
   callback routine for every Class and Category loaded.  The following
   variable stores the bundle that is currently doing the loading so we know
   where to store the class names. 
*/
static NSBundle		*_loadingBundle = nil;
static NSBundle		*_gnustep_bundle = nil;
static NSRecursiveLock	*load_lock = nil;
static BOOL		_strip_after_loading = NO;

static NSString	*gnustep_target_dir = 
#ifdef GNUSTEP_TARGET_DIR
  @GNUSTEP_TARGET_DIR;
#else
  nil;
#endif
static NSString	*gnustep_target_cpu = 
#ifdef GNUSTEP_TARGET_CPU
  @GNUSTEP_TARGET_CPU;
#else
  nil;
#endif
static NSString	*gnustep_target_os = 
#ifdef GNUSTEP_TARGET_OS
  @GNUSTEP_TARGET_OS;
#else
  nil;
#endif
static NSString	*library_combo = 
#ifdef LIBRARY_COMBO
  @LIBRARY_COMBO;
#else
  nil;
#endif

/* This function is provided for objc-load.c, although I'm not sure it
   really needs it (So far only needed if using GNU dld library) */
const char *
objc_executable_location (void)
{
  return [[_executable_path stringByDeletingLastPathComponent] cString];
}

static BOOL
bundle_directory_readable(NSString *path)
{
  NSFileManager	*mgr = [NSFileManager defaultManager];
  BOOL		directory;

  if ([mgr fileExistsAtPath: path isDirectory: &directory] == NO
    || !directory)
    return NO;

  return [mgr isReadableFileAtPath: path];
}

static BOOL
bundle_file_readable(NSString *path)
{
  NSFileManager	*mgr = [NSFileManager defaultManager];
  return [mgr isReadableFileAtPath: path];
}

/* Get the object file that should be located in the bundle of the same name */
static NSString *
bundle_object_name(NSString *path, NSString* executable)
{
  NSFileManager	*mgr = [NSFileManager defaultManager];
  NSString	*name, *path0, *path1, *path2;

  if (executable)
    {
      NSString	*exepath;

      name = [executable lastPathComponent];
      exepath = [executable stringByDeletingLastPathComponent];
      if ([exepath isEqualToString: @""] == NO)
	{
	  if ([exepath isAbsolutePath] == YES)
	    path = exepath;
	  else
	    path = [path stringByAppendingPathComponent: exepath];
	}
    }
  else
    {
      name = [[path lastPathComponent] stringByDeletingPathExtension];
      path = [path stringByDeletingLastPathComponent];
    }
  path0 = [path stringByAppendingPathComponent: name];
  path = [path stringByAppendingPathComponent: gnustep_target_dir];
  path1 = [path stringByAppendingPathComponent: name];
  path = [path stringByAppendingPathComponent: library_combo];
  path2 = [path stringByAppendingPathComponent: executable];

  if ([mgr isReadableFileAtPath: path2] == YES)
    return path2;
  else if ([mgr isReadableFileAtPath: path1] == YES)
    return path1;
  else if ([mgr isReadableFileAtPath: path0] == YES)
    return path0;
  return path2;
}

/* Construct a path from components */
static NSString * 
_bundle_resource_path(NSString *primary, NSString* bundlePath, NSString *lang)
{
  if (bundlePath)
    primary = [primary stringByAppendingPathComponent: bundlePath];
  if (lang)
    primary = [primary stringByAppendingPathComponent: 
      [NSString stringWithFormat: @"%@.lproj", lang]];
  return primary;
}

/* Find the first directory entry with a given name (with any extension) */
static NSString *
_bundle_name_first_match(NSString* directory, NSString* name)
{
  NSFileManager	*mgr = [NSFileManager defaultManager];
  NSEnumerator	*filelist;
  NSString	*path;
  NSString	*match;
  NSString	*cleanname;

  /* name might have a directory in it also, so account for this */
  path = [[directory stringByAppendingPathComponent: name] 
    stringByDeletingLastPathComponent];
  cleanname = [name lastPathComponent];
  filelist = [[mgr directoryContentsAtPath: path] objectEnumerator];
  while ((match = [filelist nextObject]))
    {
      if ([cleanname isEqual: [match stringByDeletingPathExtension]])
	return [path stringByAppendingPathComponent: match];
    }

  return nil;
}

@interface NSBundle (Private)
+ (void) _addFrameworkFromClass:(Class)frameworkClass;
- (NSArray *) _bundleClasses;
@end

@implementation NSBundle (Private)

/* Nicola:

   Frameworks can be used in an application in two different ways:

   () the framework is dynamically/manually loaded, as if it were a
   bundle.  This is the easier case, because we already have the
   bundle setup with the correct path (it's the programmer's
   responsibility to find the framework bundle on disk); we get all
   information from the bundle dictionary, such as the version; we
   also create the class list when loading the bundle, as for any
   other bundle.

   () the framework was linked into the application.  This is much
   more difficult, because without using tricks, we have no way of
   knowing where the framework bundle (needed eg for resources) is on
   disk, and we have no way of knowing what the class list is, or the
   version.  So the trick we use in this case to work around those
   problems is that gnustep-make generates a 'NSFramework_xxx' class
   and compiles it into each framework.  By asking the class, we can
   get the version information, the list of classes which were
   compiled into the framework, and the path were the framework bundle
   was supposed to be installed (this is not completely reliable as
   the programmer might change it later on by specifying a different
   GNUSTEP_INSTALLATION_DIR when installing ... (TODO - modify
   gnustep-make so that it issues a warning if you do that, suggesting
   you to recompile before installing!)). (FIXME/TODO: If the linker
   supports it, we should be asking the path on disk to the shared
   object containing the NSFramework_xxx class ... and we can very
   reliably guess the framework path from that path!!!!).

   So at startup, we scan all classes which were compiled into the
   application.  For each NSFramework_ class, we call the following
   function, which records the name of the framework, the version,
   the classes belonging to it, and tries to determine the path
   on disk to the framework bundle.

*/
+ (void) _addFrameworkFromClass:(Class)frameworkClass
{
  NSBundle	 *bundle;
  NSString	**fmClasses;
  NSString	 *bundlePath = nil;
  int		  len;

  if (frameworkClass == Nil)
    {
      return;
    }

  /* FIXME NICOLA :-) Hmmm ... consider the case that the framework
     was linked (using xxx_LIBRARIES_DEPEND_UPON) into a bundle.  */
  if (_loadingBundle != nil)
    {
      return;
    }
  
  len = strlen (frameworkClass->name);
  
  if (len > 12 * sizeof(char)
      && !strncmp("NSFramework_", frameworkClass->name, 12))
    {
      NSString *varEnv, *path, *name;
      
      /* The name of the framework.  */
      name = [NSString stringWithCString: &frameworkClass->name[12]];
      
      /* Create the framework bundle if the bundle was linked into the 
	 application.  */

      /* NICOLA: I think if we could get the path to the NSFramework_
	 class from the linker, then we could build the framework path
	 reliably.  I consider the following only a hack.  */

      /* varEnv is something like GNUSTEP_LOCAL_ROOT.  */
      varEnv = [frameworkClass frameworkEnv];
      if (varEnv != nil  &&  [varEnv length] > 0)
	{
	  /* FIXME - I don't think we should be reading it from
	     the environment directly!  */
	  bundlePath = [[[NSProcessInfo processInfo] environment]
			 objectForKey: varEnv];
	}
      
      /* FIXME - path is something like ?.  */
      path = [frameworkClass frameworkPath];
      if (path && [path length])
	{
	  if (bundlePath)
	    {
	      bundlePath = [bundlePath stringByAppendingPathComponent: path];
	    }
	  else
	    {
	      bundlePath = path;
	    }
	}
      else
	{
	  bundlePath = [bundlePath stringByAppendingPathComponent: 
				     @"Library/Frameworks"];
	}
      
      bundlePath = [bundlePath stringByAppendingPathComponent:
				 [NSString stringWithFormat: 
					     @"%@.framework", 
					   name]];
      
      /* Try creating the bundle.  */
      bundle = [[self alloc] initWithPath: bundlePath];
      
      if (bundle == nil)
	{
	  /* TODO: We couldn't locate the framework in the expected
	     location.  NICOLA: We should be trying to locate it in
	     some other obvious location, iterating over
	     user/network/local/system dirs ...  TODO.  */
	  NSLog (@"Problem locating framework locating for framework %@",
		 name);
	  return;
	}
      
      bundle->_bundleType = NSBUNDLE_FRAMEWORK;
      bundle->_codeLoaded = YES;
      /* frameworkVersion is something like 'A'.  */
      bundle->_frameworkVersion = RETAIN([frameworkClass frameworkVersion]);
      bundle->_bundleClasses = RETAIN([NSMutableArray arrayWithCapacity: 2]);
      
      /* A NULL terminated list of class names - the classes contained
	 in the framework.  */
      fmClasses = [frameworkClass frameworkClasses];
      
      while (*fmClasses != NULL)
	{
	  NSValue *value;
	  Class    class = NSClassFromString(*fmClasses);
	  
	  value = [NSValue valueWithNonretainedObject: class];
	  
	  [(NSMutableArray *)[bundle _bundleClasses] addObject: value];
	  
	  fmClasses++;
	}
    }
}

- (NSArray *) _bundleClasses
{
  return _bundleClasses;
}

@end

void
_bundle_load_callback(Class theClass, struct objc_category *theCategory)
{
  NSCAssert(_loadingBundle, NSInternalInconsistencyException);

  /* We never record categories - if this is a category, just do nothing.  */
  if (theCategory != 0)
    {
      return;
    }

  /* Don't store the internal NSFramework_xxx class into the list of
     bundle classes.  */
  if (strlen (theClass->name) > 12   &&  !strncmp ("NSFramework_", 
						   theClass->name, 12))
    {
      return; 
    }

  /* Store classes (but don't store categories) */
  [(NSMutableArray *)[_loadingBundle _bundleClasses] addObject:
		       [NSValue valueWithNonretainedObject: (id)theClass]];
}


@implementation NSBundle

+ (void)initialize
{
  if (self == [NSBundle class])
    {
      NSDictionary *env;
      void         *state = NULL;
      Class         class;

      _emptyTable = RETAIN([NSDictionary dictionary]);

      /* Need to make this recursive since both mainBundle and initWithPath:
	 want to lock the thread */
      load_lock = [NSRecursiveLock new];
      env = [[NSProcessInfo processInfo] environment];
      if (env)
	{
          NSArray		*paths;
	  NSMutableString	*system = nil;
	  NSString		*str;

	  if ((str = [env objectForKey: @"GNUSTEP_TARGET_CPU"]) != nil)
	    gnustep_target_cpu = RETAIN(str);
	  else if ((str = [env objectForKey: @"GNUSTEP_HOST_CPU"]) != nil)
	    gnustep_target_cpu = RETAIN(str);
	
	  if ((str = [env objectForKey: @"GNUSTEP_TARGET_OS"]) != nil)
	    gnustep_target_os = RETAIN(str);
	  else if ((str = [env objectForKey: @"GNUSTEP_HOST_OS"]) != nil)
	    gnustep_target_os = RETAIN(str);
	
	  if ((str = [env objectForKey: @"GNUSTEP_TARGET_DIR"]) != nil)
	    gnustep_target_dir = RETAIN(str);
	  else if ((str = [env objectForKey: @"GNUSTEP_HOST_DIR"]) != nil)
	    gnustep_target_dir = RETAIN(str);
	
	  if ((str = [env objectForKey: @"LIBRARY_COMBO"]) != nil)
	    library_combo = RETAIN(str);

          paths = NSSearchPathForDirectoriesInDomains(GSLibrariesDirectory,
                                                      NSSystemDomainMask, YES);
          if ((paths != nil) && ([paths count] > 0))
	    system = RETAIN([paths objectAtIndex: 0]);

	  _executable_path = nil;
#ifdef PROCFS_EXE_LINK
	  _executable_path = [[NSFileManager defaultManager]
	    pathContentOfSymbolicLinkAtPath:
              [NSString stringWithCString: PROCFS_EXE_LINK]];
#endif
	  if (_executable_path == nil || [_executable_path length] == 0)
	    {
	      _executable_path =
		[[[NSProcessInfo processInfo] arguments] objectAtIndex: 0];
	      _executable_path = 
		[self _absolutePathOfExecutable: _executable_path];
	      NSAssert(_executable_path, NSInternalInconsistencyException);
	    }

	  RETAIN(_executable_path);
	  _gnustep_bundle = RETAIN([self bundleWithPath: system]);

#if 0
	  _loadingBundle = [self mainBundle];
	  handle = objc_open_main_module(stderr);
	  printf("%08x\n", handle);
#endif
#if NeXT_RUNTIME
	  {
	    int i, numClasses = 0, newNumClasses = objc_getClassList(NULL, 0);
	    Class *classes = NULL;
	    while (numClasses < newNumClasses) {
	      numClasses = newNumClasses;
	      classes = realloc(classes, sizeof(Class) * numClasses);
	      newNumClasses = objc_getClassList(classes, numClasses);
	    }
	    for (i = 0; i < numClasses; i++)
	      {
		[self _addFrameworkFromClass: classes[i]];
	      }
	    free(classes);
	  }
#else
	  while ((class = objc_next_class(&state)))
	    {
	      [self _addFrameworkFromClass: class];
	    }
#endif
#if 0
	  //		  _bundle_load_callback(class, NULL);
	  //		  bundle = (NSBundle *)NSMapGet(_bundles, bundlePath);

	  objc_close_main_module(handle);
	  _loadingBundle = nil;
#endif
	}
    }
}

+ (NSArray *) allBundles
{
  NSMapEnumerator	enumerate;
  NSMutableArray	*array = [NSMutableArray arrayWithCapacity: 2];
  void			*key;
  NSBundle		*bundle;

  [load_lock lock];
  enumerate = NSEnumerateMapTable(_bundles);
  while (NSNextMapEnumeratorPair(&enumerate, &key, (void **)&bundle))
    {
      if (bundle->_bundleType == NSBUNDLE_FRAMEWORK)
	continue;

      if ([array indexOfObjectIdenticalTo: bundle] == NSNotFound)
	{
	  [array addObject: bundle];
	}
    }
  [load_lock unlock];
  return array;
}

+ (NSArray *) allFrameworks
{
  NSMapEnumerator  enumerate;
  NSMutableArray  *array = [NSMutableArray arrayWithCapacity: 2];
  void		  *key;
  NSBundle	  *bundle;

  [load_lock lock];
  enumerate = NSEnumerateMapTable(_bundles);
  while (NSNextMapEnumeratorPair(&enumerate, &key, (void **)&bundle))
    {
      if (bundle->_bundleType == NSBUNDLE_FRAMEWORK
	  && [array indexOfObjectIdenticalTo: bundle] == NSNotFound)
	{
	  [array addObject: bundle];
	}
    }
  [load_lock unlock];
  return array;
}

/* For an application, returns the main bundle of the application.
   For a tool, returns the main bundle associated with the tool (this
   is experimental and not yet supported by gnustep-make, but will
   soon be).
   
   For an application, the structure is as follows - 
   
   The executable is Gomoku.app/ix86/linux-gnu/gnu-gnu-gnu/Gomoku
   and the main bundle directory is Gomoku.app/.
   
   For a tool, the structure is as follows - 
   
   The executable is xxx/Tools/ix86/linux-gnu/gnu-gnu-gnu/Control
   and the main bundle directory is xxx/Tools/Resources/Control.
   
   (when the tool has not yet been installed, it's similar - 
   xxx/shared_obj/ix86/linux-gnu/gnu-gnu-gnu/Control
   and the main bundle directory is xxx/Resources/Control).
   
   (For a flattened structure, the structure is the same without the
   ix86/linux-gnu/gnu-gnu-gnu directories).  */
+ (NSBundle *)mainBundle
{
  [load_lock lock];
  if (!_mainBundle) 
    {
      /* We figure out the main bundle directory by examining the location
	 of the executable on disk.  */
      NSString *path, *s;

      /* We don't know at the beginning if it's a tool or an application.  */
      BOOL isApplication = YES;

      /* If it's a tool, we will need the tool name.  Since we don't
         know yet if it's a tool or an application, we always store
         the executable name here - just in case it turns out it's a
         tool.  */
      NSString *toolName = [_executable_path lastPathComponent];

      /* Strip off the name of the program */
      path = [_executable_path stringByDeletingLastPathComponent];

      /* We now need to chop off the extra subdirectories, the library
	 combo and the target cpu/os if they exist.  The executable
	 and this library should match so that is why we can use the
	 compiled-in settings. */
      /* library combo */
      s = [path lastPathComponent];
      if ([s isEqual: library_combo])
	{
	  path = [path stringByDeletingLastPathComponent];
	}
      /* target os */
      s = [path lastPathComponent];
      if ([s isEqual: gnustep_target_os])
	{
	  path = [path stringByDeletingLastPathComponent];
	}
      /* target cpu */
      s = [path lastPathComponent];
      if ([s isEqual: gnustep_target_cpu])
	{
	  path = [path stringByDeletingLastPathComponent];
	}
      /* object dir */
      s = [path lastPathComponent];
      if ([s hasSuffix: @"_obj"])
	{
	  path = [path stringByDeletingLastPathComponent];
	  /* if it has an object dir it can only be a
             non-yet-installed tool.  */
	  isApplication = NO;
	}
      
      if (isApplication == YES)
	{
	  s = [path lastPathComponent];
	  if (([s hasSuffix: @".app"]  == NO)
	      && ([s hasSuffix: @".debug"] == NO)
	      && ([s hasSuffix: @".profile"] == NO))
	    {
	      isApplication = NO;
	    }
	}
      
      if (isApplication == NO)
	{
	  path = [path stringByAppendingPathComponent: @"Resources"];
	  path = [path stringByAppendingPathComponent: toolName];
	}

      NSDebugMLLog(@"NSBundle", @"Found main in %@\n", path);
      /* We do alloc and init separately so initWithPath: knows we are
          the _mainBundle.  Please note that we do *not* autorelease
          mainBundle, because we don't want it to be ever released.  */
      _mainBundle = [self alloc];
      /* Please note that _mainBundle can perfectly well be nil.  */
      _mainBundle = [_mainBundle initWithPath:path];
    }
  
  [load_lock unlock];
  return _mainBundle;
}

/* NB: We will not find a class if the bundle has not been loaded yet!  */
+ (NSBundle *) bundleForClass: (Class)aClass
{
  void*     key;
  NSBundle* bundle;
  NSMapEnumerator enumerate;
  if (!aClass)
    return nil;

  [load_lock lock];
  bundle = nil;
  enumerate = NSEnumerateMapTable(_bundles);
  while (NSNextMapEnumeratorPair(&enumerate, &key, (void **)&bundle))
    {
      int i, j;
      NSArray *bundleClasses = [bundle _bundleClasses];
      BOOL found = NO;

      j = [bundleClasses count];
      for (i = 0; i < j && found == NO; i++)
	{
	  if ([[bundleClasses objectAtIndex: i]
	    nonretainedObjectValue] == aClass)
	    found = YES;
	}

      if (found == YES)
	break;

      bundle = nil;
    }
  [load_lock unlock];
  if (!bundle) 
    {
      /* Is it in the main bundle? */
      if (class_is_class(aClass))
	bundle = [self mainBundle];
    }

  return bundle;
}

+ (NSBundle*) bundleWithPath: (NSString*)path
{
  return AUTORELEASE([[self alloc] initWithPath: path]);
}

- (id) initWithPath: (NSString*)path
{
  [super init];

  if (!path || [path length] == 0) 
    {
      NSLog(@"No path specified for bundle");
      [self dealloc];
      return nil;
    }
  if ([path isAbsolutePath] == NO)
    {
      NSLog(@"WARNING: NSBundle -initWithPath: requires absolute path names!");
      path = [[[NSFileManager defaultManager] currentDirectoryPath]
	       stringByAppendingPathComponent: path];
    }

  /* Check if we were already initialized for this directory */
  [load_lock lock];
  if (_bundles) 
    {
      NSBundle* bundle = (NSBundle *)NSMapGet(_bundles, path);
      if (bundle)
	{
	  RETAIN(bundle); /* retain - look as if we were alloc'ed */
	  [load_lock unlock];
	  [self dealloc];
	  return bundle;
	}
    }
  [load_lock unlock];

  if (bundle_directory_readable(path) == NO)
    {
      NSDebugMLLog(@"NSBundle", @"Could not access path %@ for bundle", path);
      [self dealloc];
      return nil;
    }

  _path = [path copy];

  if ([[[_path lastPathComponent] pathExtension] isEqual: @"framework"] == YES)
    {
      _bundleType = (unsigned int)NSBUNDLE_FRAMEWORK;
    }
  else
    {
      if (self == _mainBundle)
	_bundleType = (unsigned int)NSBUNDLE_APPLICATION;
      else
	_bundleType = (unsigned int)NSBUNDLE_BUNDLE;
    }

  [load_lock lock];
  if (!_bundles)
    {
      _bundles = NSCreateMapTable(NSObjectMapKeyCallBacks,
				  NSNonOwnedPointerMapValueCallBacks, 0);
    }
  NSMapInsert(_bundles, _path, self);
  [load_lock unlock];

  return self;
}

- (void) dealloc
{
  if (_path != nil)
    {
      [load_lock lock];
      NSMapRemove(_bundles, _path);
      [load_lock unlock];
      RELEASE(_path);
    }
  TEST_RELEASE(_frameworkVersion);
  TEST_RELEASE(_bundleClasses);
  TEST_RELEASE(_infoDict);
  TEST_RELEASE(_localizations);
  [super dealloc];
}

- (NSString *) bundlePath
{
  return _path;
}

- (Class) classNamed: (NSString *)className
{
  int     i, j;
  Class   theClass = Nil;

  if (!_codeLoaded) 
    {
      if (self != _mainBundle && ![self load]) 
	{
	  NSLog(@"No classes in bundle");
	  return Nil;
	}
    }

  if (self == _mainBundle || self == _gnustep_bundle)
    {
      theClass = NSClassFromString(className);
      if (theClass && [[self class] bundleForClass:theClass] != _mainBundle)
	theClass = Nil;
    } 
  else 
    {
      BOOL found = NO;

      theClass = NSClassFromString(className);
      j = [_bundleClasses count];

      for (i = 0; i < j  &&  found == NO; i++)
	{
	  Class c = [[_bundleClasses objectAtIndex: i] nonretainedObjectValue];

	  if (c == theClass) 
	    {
	      found = YES;
	    }
	}

      if (found == NO)
	{
	  theClass = Nil;
	}
    }
  
  return theClass;
}

- (Class) principalClass
{
  NSString* class_name;

  if (_principalClass)
    {
      return _principalClass;
    }

  class_name = [[self infoDictionary] objectForKey: @"NSPrincipalClass"];
  
  if (self == _mainBundle || self == _gnustep_bundle) 
    {
      _codeLoaded = YES;
      if (class_name)
	{
	  _principalClass = NSClassFromString(class_name);
	}
      return _principalClass;
    }

  if ([self load] == NO)
    {
      return Nil;
    }

  if (class_name)
    {
      _principalClass = NSClassFromString(class_name);
    }
  else if ([_bundleClasses count])
    {
      _principalClass = [[_bundleClasses objectAtIndex: 0]
			  nonretainedObjectValue];
    }
  return _principalClass;
}

- (BOOL) load
{
  if (self == _mainBundle || self == _gnustep_bundle) 
    {
      _codeLoaded = YES;
      return YES;
    }

  [load_lock lock];
  if (!_codeLoaded)
    {
      NSString       *object, *path;
      NSEnumerator   *classEnumerator;
      NSMutableArray *classNames;
      NSValue        *class;

      object = [[self infoDictionary] objectForKey: @"NSExecutable"];
      if (object == nil || [object length] == 0)
	{
	  [load_lock unlock];
	  return NO;
	}
      if (_bundleType == NSBUNDLE_FRAMEWORK)
	{
	  path = [_path stringByAppendingPathComponent:@"Versions/Current"];
	}
      else
	{
	  path = _path;
	}
      object = bundle_object_name(path, object);
      _loadingBundle = self;
      _bundleClasses = RETAIN([NSMutableArray arrayWithCapacity: 2]);
      if (objc_load_module([object cString], 
			   stderr, _bundle_load_callback, NULL, NULL))
	{
	  [load_lock unlock];
	  return NO;
	}
      _codeLoaded = YES;
      /* After we load code from a bundle, we retain the bundle until
	 we unload it (because we never unload bundles, that is
	 forever).  The reason why we retain it is that we need it!
	 We need it to answer calls like bundleForClass:; also, users
	 normally want all loaded bundles to appear when they call
	 +allBundles.  */
      RETAIN (self);
      _loadingBundle = nil;
      
      classNames = [NSMutableArray arrayWithCapacity: [_bundleClasses count]];
      classEnumerator = [_bundleClasses objectEnumerator];
      while ((class = [classEnumerator nextObject]) != nil)
	{
	  [classNames addObject: NSStringFromClass([class
						     nonretainedObjectValue])];
	}

      [load_lock unlock];

      [[NSNotificationCenter defaultCenter]
        postNotificationName: NSBundleDidLoadNotification 
        object: self
        userInfo: [NSDictionary dictionaryWithObject: classNames
	  forKey: NSLoadedClasses]];

      return YES;
    }
  [load_lock unlock];
  return YES;
}

/* This method is the backbone of the resource searching for NSBundle. It
   constructs an array of paths, where each path is a possible location
   for a resource in the bundle.  The current algorithm for searching goes:

     <main bundle>/Resources/<bundlePath>
     <main bundle>/Resources/<bundlePath>/<language.lproj>
     <main bundle>/<bundlePath>
     <main bundle>/<bundlePath>/<language.lproj>
*/
+ (NSArray *) _bundleResourcePathsWithRootPath: (NSString *)rootPath
				       subPath: (NSString *)bundlePath
{
  NSString* primary;
  NSString* language;
  NSArray* languages;
  NSMutableArray* array;
  NSEnumerator* enumerate;

  array = [NSMutableArray arrayWithCapacity: 8];
  languages = [NSUserDefaults userLanguages];

  primary = [rootPath stringByAppendingPathComponent: @"Resources"];
  [array addObject: _bundle_resource_path(primary, bundlePath, nil)];
  enumerate = [languages objectEnumerator];
  while ((language = [enumerate nextObject]))
    [array addObject: _bundle_resource_path(primary, bundlePath, language)];
     
  primary = rootPath;
  [array addObject: _bundle_resource_path(primary, bundlePath, nil)];
  enumerate = [languages objectEnumerator];
  while ((language = [enumerate nextObject]))
    [array addObject: _bundle_resource_path(primary, bundlePath, language)];

  return array;
}

+ (NSString *) pathForResource: (NSString *)name
			ofType: (NSString *)ext	
		    inRootPath: (NSString *)rootPath
		   inDirectory: (NSString *)bundlePath
		   withVersion: (int)version
{
  NSString *path, *fullpath;
  NSEnumerator* pathlist;
    
  if (!name || [name length] == 0) 
    {
      [NSException raise: NSInvalidArgumentException
        format: @"No resource name specified."];
      /* NOT REACHED */
    }

  pathlist = [[self _bundleResourcePathsWithRootPath: rootPath
		    subPath: bundlePath] objectEnumerator];
  fullpath = nil;
  while ((path = [pathlist nextObject]))
    {
      if (!bundle_directory_readable(path))
	continue;

      if (ext && [ext length] != 0)
	{
	  fullpath = [path stringByAppendingPathComponent:
			     [NSString stringWithFormat: @"%@.%@", name, ext]];
	  if ( bundle_file_readable(fullpath) )
	    {
	      if (gnustep_target_os)
		{
		  NSString* platpath;
		  platpath = [path stringByAppendingPathComponent:
		    [NSString stringWithFormat: @"%@-%@.%@", 
		    name, gnustep_target_os, ext]];
		  if (bundle_file_readable(platpath))
		    fullpath = platpath;
		}
	    }
	  else
	    fullpath = nil;
	}
      else
	{
	  fullpath = _bundle_name_first_match(path, name);
	  if (fullpath && gnustep_target_os)
	    {
	      NSString	*platpath;

	      platpath = _bundle_name_first_match(path, 
		[NSString stringWithFormat: @"%@-%@", 
		name, gnustep_target_os]);
	      if (platpath != nil)
		fullpath = platpath;
	    }
	}
      if (fullpath != nil)
	break;
    }

  return fullpath;
}

+ (NSString *) pathForResource: (NSString *)name
			ofType: (NSString *)ext	
		   inDirectory: (NSString *)bundlePath
		   withVersion: (int) version
{
    return [self pathForResource: name
		 ofType: ext
		 inRootPath: bundlePath
		 inDirectory: nil
		 withVersion: version];
}

+ (NSString *) pathForResource: (NSString *)name
			ofType: (NSString *)ext	
		   inDirectory: (NSString *)bundlePath
{
    return [self pathForResource: name
		 ofType: ext
		 inRootPath: bundlePath
		 inDirectory: nil
		 withVersion: 0];
}

- (NSString *) pathForResource: (NSString *)name
			ofType: (NSString *)ext
{
  return [self pathForResource: name
	       ofType: ext 
	       inDirectory: nil];
}

- (NSString *) pathForResource: (NSString *)name
			ofType: (NSString *)ext
		   inDirectory: (NSString *)bundlePath
{
  NSString *rootPath;

  if (_frameworkVersion)
    rootPath = [NSString stringWithFormat:@"%@/Versions/%@", [self bundlePath],
			 _frameworkVersion];
  else
    rootPath = [self bundlePath];

  return [NSBundle pathForResource: name
		   ofType: ext
		   inRootPath: rootPath
		   inDirectory: bundlePath
		   withVersion: _version];
}

- (NSArray *) pathsForResourcesOfType: (NSString *)extension
			  inDirectory: (NSString *)bundlePath
{
  BOOL allfiles;
  NSString *path;
  NSMutableArray *resources;
  NSEnumerator *pathlist;
  NSFileManager	*mgr = [NSFileManager defaultManager];
    
  pathlist = [[NSBundle _bundleResourcePathsWithRootPath: [self bundlePath]
			subPath: bundlePath] objectEnumerator];
  resources = [NSMutableArray arrayWithCapacity: 2];
  allfiles = (extension == nil || [extension length] == 0);

  while((path = [pathlist nextObject]))
    {
      NSEnumerator *filelist;
      NSString *match;

      filelist = [[mgr directoryContentsAtPath: path] objectEnumerator];
      while ((match = [filelist nextObject]))
	{
	  if (allfiles || [extension isEqual: [match pathExtension]])
	    [resources addObject: [path stringByAppendingPathComponent: match]];
	}
    }

  return resources;
}

- (NSString *) localizedStringForKey: (NSString *)key	
			       value: (NSString *)value
			       table: (NSString *)tableName
{
  NSDictionary	*table;
  NSString	*newString = nil;

  if (_localizations == nil)
    _localizations = [[NSMutableDictionary alloc] initWithCapacity: 1];

  if (tableName == nil || [tableName isEqualToString: @""] == YES)
    {
      tableName = @"Localizable";
      table = [_localizations objectForKey: tableName];
    }
  else if ((table = [_localizations objectForKey: tableName]) == nil
    && [@"strings" isEqual: [tableName pathExtension]] == YES)
    {
      tableName = [tableName stringByDeletingPathExtension];
      table = [_localizations objectForKey: tableName];
    }

  if (table == nil)
    {
      NSString			*tablePath;

      /*
       * Make sure we have an empty table in place in case anything
       * we do somehow causes recursion.  The recusive call will look
       * up the string in the empty table.
       */
      [_localizations setObject: _emptyTable forKey: tableName];

      tablePath = [self pathForResource: tableName ofType: @"strings"];
      if (tablePath)
	{
	  NSString	*tableContent;

	  tableContent = [NSString stringWithContentsOfFile: tablePath];
	  NS_DURING
	    {
	      table = [tableContent propertyListFromStringsFileFormat]; 
	    }
	  NS_HANDLER
	    {
	      NSLog(@"Failed to parse strings file %@ - %@",
			tablePath, localException);
	      table = nil;
	    }
	  NS_ENDHANDLER
	}
      else
	NSLog(@"Failed to locate strings file %@", tableName);
	
      /*
       * If we couldn't found and parsed the strings table, we put it in
       * the cache of strings tables in this bundle, otherwise we will just
       * be keeping the empty table in the cache so we don't keep retrying.
       */
      if (table != nil)
	[_localizations setObject: table forKey: tableName];
    }

  if (key == nil || (newString = [table objectForKey: key]) == nil)
    {
      NSString	*show = [[NSUserDefaults standardUserDefaults]
			 objectForKey: NSShowNonLocalizedStrings];
      if (show && [show isEqual: @"YES"])
        {
	  /* It would be bad to localize this string! */
	  NSLog(@"Non-localized string: %@\n", newString);
	  newString = [key uppercaseString];
	}
      else
	{
	  newString = value;
	  if (newString == nil || [newString isEqualToString: @""] == YES)
	    newString = key;
	}
      if (newString == nil)
	newString = @"";
    }
  
  return newString;
}

+ (void) stripAfterLoading: (BOOL)flag
{
  _strip_after_loading = flag;
}

- (NSString *) resourcePath
{
  NSString *version = _frameworkVersion;

  if (!version)
    version = @"Current";

  if (_bundleType == NSBUNDLE_FRAMEWORK)
    {
      return [_path stringByAppendingPathComponent:
		      [NSString stringWithFormat:@"Versions/%@/Resources", 
				version]];
    }
  else
    {
      return [_path stringByAppendingPathComponent: @"Resources"];
    }
}

- (NSDictionary *) infoDictionary
{
  NSString* path;

  if (_infoDict)
    return _infoDict;

  path = [self pathForResource: @"Info-gnustep" ofType: @"plist"];
  if (path)
    _infoDict = [[NSDictionary alloc] initWithContentsOfFile: path];
  else
    {
      path = [self pathForResource: @"Info" ofType: @"plist"];
      if (path)
	_infoDict = [[NSDictionary alloc] initWithContentsOfFile: path];
      else
	_infoDict = RETAIN([NSDictionary dictionary]);
    }
  return _infoDict;
}

- (unsigned)bundleVersion
{
  return _version;
}

/* Since I don't know how version numbers should behave - the version
   number is not used. (FIXME)
*/
- (void)setBundleVersion:(unsigned)version
{
  _version = version;
}

@end

@implementation NSBundle (GNUstep)

/** Return a bundle which accesses the first existing directory from the list 
   GNUSTEP_USER_ROOT/Libraries/Resources/libraryName/
   GNUSTEP_NETWORK_ROOT/Libraries/Resources/libraryName/
   GNUSTEP_LOCAL_ROOT/Libraries/Resources/libraryName/
   GNUSTEP_SYSTEM_ROOT/Libraries/Resources/libraryName/
 */
+ (NSBundle *) bundleForLibrary: (NSString *)libraryName
{
  NSArray *paths;
  NSEnumerator *enumerator;
  NSString *path;
  NSString *tail;
  NSFileManager *fm = [NSFileManager defaultManager];
  
  if (libraryName == nil)
    {
      return nil;
    }
  
  tail = [@"Resources" stringByAppendingPathComponent: libraryName];

  paths = NSSearchPathForDirectoriesInDomains (GSLibrariesDirectory,
					       NSAllDomainsMask, YES);
  
  enumerator = [paths objectEnumerator];
  while ((path = [enumerator nextObject]))
    {
      BOOL isDir;
      path = [path stringByAppendingPathComponent: tail];
      
      if ([fm fileExistsAtPath: path  isDirectory: &isDir]  &&  isDir)
	{
	  return [self bundleWithPath: path];
	}
    }
  
  return nil;
}

+ (NSString *) _absolutePathOfExecutable: (NSString *)path
{
  NSFileManager *mgr;
  NSDictionary   *env;
  NSString *pathlist, *prefix;
  id patharr;

  path = [path stringByStandardizingPath];
  if ([path isAbsolutePath])
    return path;

  mgr = [NSFileManager defaultManager];
  env = [[NSProcessInfo processInfo] environment];
  pathlist = [env objectForKey:@"PATH"];

/* Windows 2000 and perhaps others have "Path" not "PATH" */
  if (pathlist == nil)
    {
      pathlist = [env objectForKey:@"Path"];
    }
#if defined(__MINGW__)
  patharr = [pathlist componentsSeparatedByString:@";"];
#else
  patharr = [pathlist componentsSeparatedByString:@":"];
#endif
  /* Add . if not already in path */
  if ([patharr indexOfObject: @"."] == NSNotFound)
    {
      patharr = AUTORELEASE([patharr mutableCopy]);
      [patharr addObject: @"."];
    }
  patharr = [patharr objectEnumerator];
  while ((prefix = [patharr nextObject]))
    {
      if ([prefix isEqual:@"."])
	prefix = [mgr currentDirectoryPath];
      prefix = [prefix stringByAppendingPathComponent: path];
      if ([mgr isExecutableFileAtPath: prefix])
	return [prefix stringByStandardizingPath];
#if defined(__WIN32__)
      {
	NSString	*ext = [path pathExtension];

	/* Also add common executable extensions on windows */
	if (ext == nil || [ext length] == 0)
	  {
	    NSString *wpath;
	    wpath = [prefix stringByAppendingPathExtension: @"exe"];
	    if ([mgr isExecutableFileAtPath: wpath])
	      return [wpath stringByStandardizingPath];
	    wpath = [prefix stringByAppendingPathExtension: @"com"];
	    if ([mgr isExecutableFileAtPath: wpath])
	      return [wpath stringByStandardizingPath];
	    wpath = [prefix stringByAppendingPathExtension: @"cmd"];
	    if ([mgr isExecutableFileAtPath: wpath])
	      return [wpath stringByStandardizingPath];
	  }
	}
#endif
    }
  return nil;
}

+ (NSBundle *) gnustepBundle
{
  return _gnustep_bundle;
}

+ (NSString *) pathForGNUstepResource: (NSString *)name
			       ofType: (NSString *)ext	
			  inDirectory: (NSString *)bundlePath
{
  NSString	*path = nil;
  NSString	*bundle_path = nil;
  NSArray	*paths;
  NSBundle	*bundle;
  NSEnumerator	*enumerator;

  /* Gather up the paths */
  paths = NSSearchPathForDirectoriesInDomains(GSLibrariesDirectory,
                                              NSAllDomainsMask, YES);

  enumerator = [paths objectEnumerator];
  while ((path == nil) && (bundle_path = [enumerator nextObject]))
    {
      bundle = [self bundleWithPath: bundle_path];
      path = [bundle pathForResource: name
                              ofType: ext
                         inDirectory: bundlePath];
    }

  return path;
}

+ (NSString*) _gnustep_target_cpu
{
  return gnustep_target_cpu;
}

+ (NSString*) _gnustep_target_dir
{
  return gnustep_target_dir;
}

+ (NSString*) _gnustep_target_os
{
  return gnustep_target_os;
}

+ (NSString*) _library_combo
{
  return library_combo;
}

@end