Imported nxcompext-3.1.0-2.tar.gznxcompext/3.1.0-2

Summary: Imported nxcompext-3.1.0-2.tar.gz
Keywords:

Imported nxcompext-3.1.0-2.tar.gz
into Git repository

1 files changed, 4762 insertions, 0 deletions

diff --git a/nxcompext/NXlib.c b/nxcompext/NXlib.c
new file mode 100644
index 000000000..ed6052f34
--- /dev/null
+++ b/nxcompext/NXlib.c
@@ -0,0 +1,4762 @@
+/**************************************************************************/
+/*                                                                        */
+/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/.         */
+/*                                                                        */
+/* NXCOMPEXT, NX protocol compression and NX extensions to this software  */
+/* are copyright of NoMachine. Redistribution and use of the present      */
+/* software is allowed according to terms specified in the file LICENSE   */
+/* which comes in the source distribution.                                */
+/*                                                                        */
+/* Check http://www.nomachine.com/licensing.html for applicability.       */
+/*                                                                        */
+/* NX and NoMachine are trademarks of NoMachine S.r.l.                    */
+/*                                                                        */
+/* All rigths reserved.                                                   */
+/*                                                                        */
+/**************************************************************************/
+
+#include <sys/socket.h>
+
+#ifndef __sun
+#include <strings.h>
+#endif
+
+#include "NX.h"
+
+#include "dix.h"
+#include "os.h"
+
+#define NEED_REPLIES
+
+/*
+ * Needed to enable definition of the callback
+ * functions.
+ */
+
+#define NX_TRANS_SOCKET
+
+#include "Xlib.h"
+#include "Xutil.h"
+#include "Xlibint.h"
+
+#include "NXlib.h"
+#include "NXproto.h"
+#include "NXpack.h"
+
+#include "Clean.h"
+#include "Mask.h"
+#include "Colormap.h"
+#include "Alpha.h"
+#include "Bitmap.h"
+#include "Jpeg.h"
+#include "Pgn.h"
+#include "Rgb.h"
+#include "Rle.h"
+#include "Z.h"
+
+#include "MD5.h"
+
+#define PANIC
+#define WARNING
+#undef  TEST
+#undef  DEBUG
+#undef  DUMP
+
+/*
+ * Maximum number of colors allowed in
+ * Png encoding.
+ */
+
+#define NB_COLOR_MAX          256
+
+/*
+ * Dummy error handlers used internally to catch
+ * Xlib failures in replies.
+ */
+
+static int _NXInternalReplyErrorFunction(Display *dpy, XErrorEvent *error);
+
+static void _NXInternalLostSequenceFunction(Display *dpy, unsigned long newseq,
+                                                unsigned long lastseq, unsigned int type);
+
+/*
+ * Resource ids that can be requested by
+ * the client for use in split or unpack
+ * operations.
+ */
+
+static unsigned char _NXSplitResources[NXNumberOfResources];
+static unsigned char _NXUnpackResources[NXNumberOfResources];
+
+static Display *_NXDisplayInitialized = NULL;
+
+/*
+ * Used in asynchronous handling of
+ * GetImage replies.
+ */
+
+typedef struct
+{
+  unsigned long  sequence;
+  unsigned int   resource;
+  unsigned long  mask;
+  int            format;
+  int            width;
+  int            height;
+  _XAsyncHandler *handler;
+  XImage         *image;
+} _NXCollectImageState;
+
+static _NXCollectImageState *_NXCollectedImages[NXNumberOfResources];
+
+/*
+ * Used in asynchronous handling of
+ * GetProperty replies.
+ */
+
+typedef struct
+{
+  unsigned long  sequence;
+  unsigned int   resource;
+  Window         window;
+  Atom           property;
+  Atom           type;
+  int            format;
+  unsigned long  items;
+  unsigned long  after;
+  _XAsyncHandler *handler;
+  char           *data;
+} _NXCollectPropertyState;
+
+static _NXCollectPropertyState *_NXCollectedProperties[NXNumberOfResources];
+
+/*
+ * Used in asynchronous handling of
+ * GrabPointer replies.
+ */
+
+typedef struct
+{
+  unsigned long  sequence;
+  unsigned int   resource;
+  int            status;
+  _XAsyncHandler *handler;
+} _NXCollectGrabPointerState;
+
+static _NXCollectGrabPointerState *_NXCollectedGrabPointers[NXNumberOfResources];
+
+/*
+ * Used in asynchronous handling of
+ * GetInputFocus replies.
+ */
+
+typedef struct
+{
+  unsigned long  sequence;
+  unsigned int   resource;
+  Window         focus;
+  int            revert_to;
+  _XAsyncHandler *handler;
+} _NXCollectInputFocusState;
+
+static _NXCollectInputFocusState *_NXCollectedInputFocuses[NXNumberOfResources];
+
+/*
+ * Used by functions handling cache of
+ * packed images.
+ */
+
+#define MD5_LENGTH            16
+
+typedef struct
+{
+  md5_byte_t   *md5;
+  XImage       *image;
+  unsigned int method;
+} _NXImageCacheEntry;
+
+int NXImageCacheSize = 0;
+int NXImageCacheHits = 0;
+int NXImageCacheOps  = 0;
+
+_NXImageCacheEntry *NXImageCache = NULL;
+
+#ifdef DUMP
+
+void _NXCacheDump(const char *label);
+
+void _NXDumpData(const unsigned char *buffer, unsigned int size);
+
+#endif
+
+/*
+ * From X11/PutImage.c.
+ *
+ * Cancel a GetReq operation, before doing
+ * _XSend or Data.
+ */
+
+#if (defined(__STDC__) && !defined(UNIXCPP)) || defined(ANSICPP)
+#define UnGetReq(name)\
+    dpy->bufptr -= SIZEOF(x##name##Req);\
+    dpy->request--
+#else
+#define UnGetReq(name)\
+    dpy->bufptr -= SIZEOF(x/**/name/**/Req);\
+    dpy->request--
+#endif
+
+#if (defined(__STDC__) && !defined(UNIXCPP)) || defined(ANSICPP)
+#define UnGetEmptyReq()\
+    dpy->bufptr -= 4;\
+    dpy->request--
+#else
+#define UnGetEmptyReq(name)\
+    dpy->bufptr -= 4;\
+    dpy->request--
+#endif
+
+/*
+ * From X11/ImUtil.c.
+ */
+
+extern int _XGetBitsPerPixel(Display *dpy, int depth);
+extern int _XGetScanlinePad(Display *dpy, int depth);
+
+#define ROUNDUP(nbytes, pad) (((nbytes) + ((pad) - 1)) & \
+                                  ~(long)((pad) - 1))
+
+static unsigned int DepthOnes(unsigned long mask)
+{
+  register unsigned long y;
+
+  y = (mask >> 1) &033333333333;
+  y = mask - y - ((y >>1) & 033333333333);
+  return ((unsigned int) (((y + (y >> 3)) &
+              030707070707) % 077));
+}
+
+#define CanMaskImage(image, mask) \
+\
+(image -> format == ZPixmap && mask != NULL && \
+    (image -> depth == 32 || image -> depth == 24 || \
+        (image -> depth == 16 && (image -> red_mask == 0xf800 && \
+            image -> green_mask == 0x7e0 && image -> blue_mask == 0x1f))))
+
+#define ShouldMaskImage(image, mask) (mask -> color_mask != 0xff)
+
+/*
+ * Initialize and reset the internal structures.
+ */
+
+extern int _NXInternalInitResources(Display *dpy);
+extern int _NXInternalResetResources(Display *dpy);
+extern int _NXInternalInitEncoders(Display *dpy);
+extern int _NXInternalResetEncoders(Display *dpy);
+
+int NXInitDisplay(Display *dpy)
+{
+  #ifdef TEST
+  fprintf(stderr, "******NXInitDisplay: Called for display at [%p].\n", (void *) dpy);
+  #endif
+
+  if (_NXDisplayInitialized == NULL)
+  {
+    _NXInternalInitResources(dpy);
+
+    _NXInternalInitEncoders(dpy);
+
+    _NXDisplayInitialized = dpy;
+
+    return 1;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******NXInitDisplay: WARNING! Internal structures already initialized.\n");
+  #endif
+
+  return 0;
+}
+
+int NXResetDisplay(Display *dpy)
+{
+  #ifdef TEST
+  fprintf(stderr, "******NXResetDisplay: Called for display at [%p].\n", (void *) dpy);
+  #endif
+
+  if (_NXDisplayInitialized != NULL)
+  {
+    _NXInternalResetResources(dpy);
+
+    _NXInternalResetEncoders(dpy);
+
+    _NXDisplayInitialized = NULL;
+
+    return 1;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******NXResetDisplay: WARNING! Internal structures already reset.\n");
+  #endif
+
+  return 0;
+}
+
+int _NXInternalInitResources(Display *dpy)
+{
+  return _NXInternalResetResources(dpy);
+}
+
+int _NXInternalResetResources(Display *dpy)
+{
+  int i;
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXInternalResetResources: Clearing all the internal structures.\n");
+  #endif
+
+  for (i = 0; i < NXNumberOfResources; i++)
+  {
+    _NXSplitResources[i]  = 0;
+    _NXUnpackResources[i] = 0;
+
+    if (_NXCollectedImages[i] != NULL)
+    {
+      #ifdef TEST
+      fprintf(stderr, "******_NXInternalResetResources: WARNING! Clearing collect image data "
+                  "for resource [%d].\n", i);
+      #endif
+
+      if (_NXCollectedImages[i] -> handler != NULL)
+      {
+        DeqAsyncHandler(dpy, _NXCollectedImages[i] -> handler);
+
+        Xfree(_NXCollectedImages[i] -> handler);
+      }
+
+      if (_NXCollectedImages[i] -> image != NULL)
+      {
+        XDestroyImage(_NXCollectedImages[i] -> image);
+      }
+
+      Xfree(_NXCollectedImages[i]);
+
+      _NXCollectedImages[i] = NULL;
+    }
+
+    if (_NXCollectedProperties[i] != NULL)
+    {
+      #ifdef TEST
+      fprintf(stderr, "******_NXInternalResetResources: WARNING! Clearing collect property data "
+                  "for resource [%d].\n", i);
+      #endif
+
+      if (_NXCollectedProperties[i] -> handler != NULL)
+      {
+        DeqAsyncHandler(dpy, _NXCollectedProperties[i] -> handler);
+
+        Xfree(_NXCollectedProperties[i] -> handler);
+      }
+
+      if (_NXCollectedProperties[i] -> data != NULL)
+      {
+        Xfree(_NXCollectedProperties[i] -> data);
+      }
+
+      Xfree(_NXCollectedProperties[i]);
+
+      _NXCollectedProperties[i] = NULL;
+    }
+
+    if (_NXCollectedGrabPointers[i] != NULL)
+    {
+      #ifdef TEST
+      fprintf(stderr, "******_NXInternalResetResources: WARNING! Clearing grab pointer data "
+                  "for resource [%d].\n", i);
+      #endif
+
+      if (_NXCollectedGrabPointers[i] -> handler != NULL)
+      {
+        DeqAsyncHandler(dpy, _NXCollectedGrabPointers[i] -> handler);
+
+        Xfree(_NXCollectedGrabPointers[i] -> handler);
+      }
+
+      Xfree(_NXCollectedGrabPointers[i]);
+
+      _NXCollectedGrabPointers[i] = NULL;
+    }
+
+    if (_NXCollectedInputFocuses[i] != NULL)
+    {
+      #ifdef TEST
+      fprintf(stderr, "******_NXInternalResetResources: WARNING! Clearing collect input focus data "
+                  "for resource [%d].\n", i);
+      #endif
+
+      if (_NXCollectedInputFocuses[i] -> handler != NULL)
+      {
+        DeqAsyncHandler(dpy, _NXCollectedInputFocuses[i] -> handler);
+
+        Xfree(_NXCollectedInputFocuses[i] -> handler);
+      }
+
+      Xfree(_NXCollectedInputFocuses[i]);
+
+      _NXCollectedInputFocuses[i] = NULL;
+    }
+  }
+
+  return 1;
+}
+
+int _NXInternalInitEncoders(Display *dpy)
+{
+  ZInitEncoder();
+
+  return 1;
+}
+
+int _NXInternalResetEncoders(Display *dpy)
+{
+  ZResetEncoder();
+
+  return 1;
+}
+
+int NXSetDisplayPolicy(Display *dpy, int policy)
+{
+  if (policy == NXPolicyImmediate)
+  {
+    return NXTransPolicy(NX_FD_ANY, NX_POLICY_IMMEDIATE);
+  }
+  else
+  {
+    return NXTransPolicy(NX_FD_ANY, NX_POLICY_DEFERRED);
+  }
+}
+
+int NXSetDisplayBuffer(Display *dpy, int size)
+{
+  /*
+   * This is not multi-thread safe, so,
+   * if you have threads, be sure that
+   * they are stopped.
+   */
+
+  char *buffer;
+
+  XFlush(dpy);
+
+  if (dpy -> bufmax - size == dpy -> buffer)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXSetDisplayBuffer: Nothing to do with buffer size matching.\n");
+    #endif
+
+    return 1;
+  }
+  else if (dpy -> bufptr != dpy -> buffer)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXSetDisplayBuffer: PANIC! The display buffer is not empty.\n");
+    #endif
+
+    return -1;
+  }
+  else if ((buffer = Xcalloc(1, size)) == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXSetDisplayBuffer: PANIC! Can't allocate [%d] bytes for the buffer.\n",
+                size);
+    #endif
+
+    return -1;
+  }
+
+  if (dpy -> buffer != NULL)
+  {
+    Xfree(dpy -> buffer);
+  }
+
+  dpy -> buffer = buffer;
+  dpy -> bufptr = dpy -> buffer;
+  dpy -> bufmax = dpy -> bufptr + size;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetDisplayBuffer: Set the display output buffer size to [%d].\n",
+              size);
+  #endif
+
+  return 1;
+}
+
+/*
+ * If set, the Popen() function in the X server
+ * wil remove the LD_LIBRARY_PATH variable from
+ * the environment before calling the execl()
+ * function on the child process.
+ */
+
+int NXUnsetLibraryPath(int value)
+{
+  int previous = _NXUnsetLibraryPath;
+
+  _NXUnsetLibraryPath = value;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXUnsetLibraryPath: Set the flag to [%d] with previous value [%d].\n",
+              value, previous);
+  #endif
+
+  return previous;
+}
+
+/*
+ * If set, the Xlib I/O error handler will simply
+ * return, instead of quitting the program. This
+ * leaves to the application the responsibility
+ * of checking the state of the XlibDisplayIOEr-
+ * ror flag.
+ */
+
+int NXHandleDisplayError(int value)
+{
+  int previous = _NXHandleDisplayError;
+
+  _NXHandleDisplayError = value;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXHandleDisplayError: Set the flag to [%d] with previous value [%d].\n",
+              value, previous);
+  #endif
+
+  return previous;
+}
+
+/*
+ * Shutdown the display descriptor and force Xlib
+ * to set the I/O error flag.
+ */
+
+Bool NXForceDisplayError(Display *dpy)
+{
+  if (dpy != NULL)
+  {
+    NXTransClose(dpy -> fd);
+
+    if (!(dpy -> flags & XlibDisplayIOError))
+    {
+      shutdown(dpy -> fd, SHUT_RDWR);
+
+      _XIOError(dpy);
+    }
+
+    return 1;
+  }
+
+  return 0;
+}
+
+/*
+ * Check if the display has become invalid. Similarly
+ * to the modified Xlib, we call the predicate funct-
+ * ion with the value of the XlibDisplayIOError flag
+ * only if the I/O error was not encountered already.
+ * The application can use this function to query the
+ * XlibDisplayIOError flag because Xlib doesn't expose
+ * the internals of the display structure to the appli-
+ * cation.
+ */
+
+int NXDisplayError(Display *dpy)
+{
+  if (dpy != NULL)
+  {
+    return (_XGetIOError(dpy) ||
+                (_NXDisplayErrorFunction != NULL &&
+                    (*_NXDisplayErrorFunction)(dpy, _XGetIOError(dpy))));
+  }
+
+  return 1;
+}
+
+/*
+ * Various queries related to the state of the
+ * display connection.
+ */
+
+int NXDisplayReadable(Display *dpy)
+{
+  int result;
+  int readable;
+
+  result = NXTransReadable(dpy -> fd, &readable);
+
+  if (result == 0)
+  {
+    #ifdef DEBUG
+    fprintf(stderr, "******NXDisplayReadable: Returning [%d] bytes readable from fd [%d].\n",
+                readable, dpy -> fd);
+    #endif
+
+    return readable;
+  }
+
+  #ifdef DEBUG
+  fprintf(stderr, "******NXDisplayReadable: WARNING! Error detected on display fd [%d].\n",
+              dpy -> fd);
+  #endif
+
+  return -1;
+}
+
+int NXDisplayFlushable(Display *dpy)
+{
+  #ifdef DEBUG
+
+  int flushable;
+
+  flushable = NXTransFlushable(dpy -> fd) +
+                  (dpy -> bufptr - dpy -> buffer);
+
+  fprintf(stderr, "******NXDisplayFlushable: Returning [%d+%d=%d] bytes flushable "
+              "to fd [%d].\n", (int) (dpy -> bufptr - dpy -> buffer),
+                  (int) (flushable - (dpy -> bufptr - dpy -> buffer)),
+                      flushable, dpy -> fd);
+
+  return flushable;
+
+  #else
+
+  return NXTransFlushable(dpy -> fd) + (dpy -> bufptr - dpy -> buffer);
+
+  #endif
+}
+
+int NXDisplayCongestion(Display *dpy)
+{
+  #ifdef DEBUG
+
+  int congestion = NXTransCongestion(dpy -> fd);
+
+  fprintf(stderr, "******NXDisplayCongestion: Returning [%d] as congestion level for fd [%d].\n",
+              congestion, dpy -> fd);
+
+  return congestion;
+
+  #else
+
+  return NXTransCongestion(dpy -> fd);
+
+  #endif
+}
+
+int NXFlushDisplay(Display *dpy, int what)
+{
+  if (!(dpy -> flags & XlibDisplayWriting) &&
+          dpy -> bufptr - dpy -> buffer > 0)
+  {
+    #ifdef DEBUG
+    fprintf(stderr, "******NXFlushDisplay: Writing with [%d] bytes in the buffer.\n",
+            (int) (dpy -> bufptr - dpy -> buffer));
+    #endif
+
+    XFlush(dpy);
+  }
+
+  if (what == NXFlushBuffer)
+  {
+    return 0;
+  }
+
+  #ifdef DEBUG
+  fprintf(stderr, "******NXFlushDisplay: Flushing with [%d] bytes in the NX transport.\n",
+              NXDisplayFlushable(dpy));
+  #endif
+
+  return NXTransFlush(dpy -> fd);
+}
+
+NXDisplayErrorPredicate NXSetDisplayErrorPredicate(NXDisplayErrorPredicate predicate)
+{
+  NXDisplayErrorPredicate previous = _NXDisplayErrorFunction;
+
+  _NXDisplayErrorFunction = predicate;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetDisplayErrorPredicate: Set the predicate to [%p] with previous value [%p].\n",
+              predicate, previous);
+  #endif
+
+  return previous;
+}
+
+NXDisplayBlockHandler NXSetDisplayBlockHandler(NXDisplayBlockHandler handler)
+{
+  NXDisplayBlockHandler previous = _NXDisplayBlockFunction;
+
+  _NXDisplayBlockFunction = handler;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetDisplayBlockHandler: Set the handler to [%p] with previous value [%p].\n",
+              handler, previous);
+  #endif
+
+  return previous;
+}
+
+NXDisplayWriteHandler NXSetDisplayWriteHandler(NXDisplayWriteHandler handler)
+{
+  NXDisplayWriteHandler previous = _NXDisplayWriteFunction;
+
+  _NXDisplayWriteFunction = handler;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetDisplayWriteHandler: Set the handler to [%p] with previous value [%p].\n",
+              handler, previous);
+  #endif
+
+  return previous;
+}
+
+NXDisplayFlushHandler NXSetDisplayFlushHandler(NXDisplayFlushHandler handler, Display *display)
+{
+  NXDisplayFlushHandler previous = _NXDisplayFlushFunction;
+
+  _NXDisplayFlushFunction = handler;
+
+  NXTransHandler(NX_FD_ANY, NX_HANDLER_FLUSH,
+                     (void (*)(void *, int)) handler, (void *) display);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetDisplayFlushHandler: Set the handler to [%p] with display [%p] "
+              "and previous value [%p].\n", handler, display, previous);
+  #endif
+
+  return previous;
+}
+
+NXDisplayStatisticsHandler NXSetDisplayStatisticsHandler(NXDisplayStatisticsHandler handler, char **buffer)
+{
+  NXDisplayStatisticsHandler previous = _NXDisplayStatisticsFunction;
+
+  _NXDisplayStatisticsFunction = handler;
+
+  /*
+   * Propagate the handler.
+   */
+
+  NXTransHandler(NX_FD_ANY, NX_HANDLER_STATISTICS,
+                     (void (*)(void *, int)) handler, (void *) buffer);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetDisplayStatisticsHandler: Set the handler to [%p] with buffer pointer [%p] "
+              "and previous value [%p].\n", handler, buffer, previous);
+  #endif
+
+  return previous;
+}
+
+NXLostSequenceHandler NXSetLostSequenceHandler(NXLostSequenceHandler handler)
+{
+  NXLostSequenceHandler previous = _NXLostSequenceFunction;
+
+  _NXLostSequenceFunction = handler;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetLostSequenceHandler: Set the handler to [%p] with previous value [%p].\n",
+              handler, previous);
+  #endif
+
+  return previous;
+}
+
+int _NXInternalReplyErrorFunction(Display *dpy, XErrorEvent *error)
+{
+  #ifdef TEST
+  fprintf(stderr, "******_NXInternalReplyErrorFunction: Internal error handler called.\n");
+  #endif
+
+  return 0;
+}
+
+void _NXInternalLostSequenceFunction(Display *dpy, unsigned long newseq,
+                                         unsigned long lastseq, unsigned int type)
+{
+  #ifdef TEST
+
+  fprintf(stderr, "******_NXInternalLostSequenceFunction: WARNING! Sequence lost with new "
+              "sequence %ld last request %ld.\n", newseq, dpy -> request);
+
+  /*
+   * TODO: Reply or event info must be implemented.
+   *
+   * fprintf(stderr, "******_NXInternalLostSequenceFunction: WARNING! Expected event or reply "
+   *             "was %ld with sequence %ld.\n", (long) rep -> type, (long) rep -> sequenceNumber);
+   */
+
+  fprintf(stderr, "******_NXInternalLostSequenceFunction: WARNING! Last sequence read "
+              "was %ld display request is %ld.\n", lastseq & 0xffff, dpy -> request & 0xffff);
+
+  #endif
+}
+
+Status NXGetControlParameters(Display *dpy, unsigned int *link_type, unsigned int *local_major,
+                                  unsigned int *local_minor, unsigned int *local_patch,
+                                      unsigned int *remote_major, unsigned int *remote_minor,
+                                          unsigned int *remote_patch, int *split_timeout, int *motion_timeout,
+                                              int *split_mode, int *split_size, unsigned int *pack_method,
+                                                  unsigned int *pack_quality, int *data_level, int *stream_level,
+                                                      int *delta_level, unsigned int *load_cache,
+                                                          unsigned int *save_cache, unsigned int *startup_cache)
+{
+  xNXGetControlParametersReply rep;
+
+  register xReq *req;
+
+  LockDisplay(dpy);
+
+  GetEmptyReq(NXGetControlParameters, req);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetControlParameters: Sending message opcode [%d].\n",
+              X_NXGetControlParameters);
+  #endif
+
+  if (_XReply(dpy, (xReply *) &rep, 0, xTrue) == xFalse)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXGetControlParameters: Error receiving reply.\n");
+    #endif
+
+    UnlockDisplay(dpy);
+
+    SyncHandle();
+
+    return 0;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetControlParameters: Got reply with link type [%u].\n", rep.linkType);
+
+  fprintf(stderr, "******NXGetControlParameters: Local protocol major [%u] minor [%u] patch [%u].\n",
+              rep.localMajor, rep.localMinor, rep.localPatch);
+
+  fprintf(stderr, "******NXGetControlParameters: Remote protocol major [%u] minor [%u] patch [%u].\n",
+              rep.remoteMajor, rep.remoteMinor, rep.remotePatch);
+
+  fprintf(stderr, "******NXGetControlParameters: Split timeout [%d] motion timeout [%d].\n",
+              (int) rep.splitTimeout, (int) rep.motionTimeout);
+
+  fprintf(stderr, "******NXGetControlParameters: Split mode [%d] split size [%d].\n",
+              (int) rep.splitMode, (int) rep.splitSize);
+
+  fprintf(stderr, "******NXGetControlParameters: Preferred pack method [%d] pack quality [%d].\n",
+              (int) rep.packMethod, (int) rep.packQuality);
+
+  fprintf(stderr, "******NXGetControlParameters: Data level [%d] stream level [%d] delta level [%d].\n",
+              rep.dataLevel, rep.streamLevel, rep.deltaLevel);
+  #endif
+
+  *link_type = rep.linkType;
+
+  *local_major = rep.localMajor;
+  *local_minor = rep.localMinor;
+  *local_patch = rep.localPatch;
+
+  *remote_major = rep.remoteMajor;
+  *remote_minor = rep.remoteMinor;
+  *remote_patch = rep.remotePatch;
+
+  *split_timeout  = rep.splitTimeout;
+  *motion_timeout = rep.motionTimeout;
+
+  *split_mode = rep.splitMode;
+  *split_size = rep.splitSize;
+
+  *pack_method  = rep.packMethod;
+  *pack_quality = rep.packQuality;
+
+  *data_level   = rep.dataLevel;
+  *stream_level = rep.streamLevel;
+  *delta_level  = rep.deltaLevel;
+
+  *load_cache    = rep.loadCache;
+  *save_cache    = rep.saveCache;
+  *startup_cache = rep.startupCache;
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  /*
+   * Install our internal out-of-sync handler.
+   */
+
+  _NXLostSequenceFunction = _NXInternalLostSequenceFunction;
+
+  return 1;
+}
+
+/*
+ * Which unpack methods are supported by the
+ * remote proxy?
+ */
+
+Status NXGetUnpackParameters(Display *dpy, unsigned int *entries, unsigned char supported_methods[])
+{
+  register xNXGetUnpackParametersReq *req;
+
+  xNXGetUnpackParametersReply rep;
+
+  register unsigned n;
+
+  #ifdef TEST
+  register unsigned i;
+  #endif
+
+  if (*entries < NXNumberOfPackMethods)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXGetUnpackParameters: Requested only [%d] entries while they should be [%d].\n",
+                *entries, NXNumberOfPackMethods);
+    #endif
+
+    return 0;
+  }
+
+  LockDisplay(dpy);
+
+  GetReq(NXGetUnpackParameters, req);
+
+  req -> entries = *entries;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetUnpackParameters: Sending message opcode [%d] with [%d] requested entries.\n",
+              X_NXGetUnpackParameters, *entries);
+  #endif
+
+  if (_XReply(dpy, (xReply *) &rep, 0, xFalse) == xFalse || rep.length == 0)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXGetUnpackParameters: Error receiving reply.\n");
+    #endif
+
+    UnlockDisplay(dpy);
+
+    SyncHandle();
+
+    return 0;
+  }
+
+  if ((n = rep.length << 2) > *entries)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXGetUnpackParameters: Got [%d] bytes of reply data while they should be [%d].\n",
+                n, *entries);
+    #endif
+
+    _XEatData(dpy, (unsigned long) n);
+
+    UnlockDisplay(dpy);
+
+    SyncHandle();
+
+    return 0;
+  }
+
+  *entries = n;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetUnpackParameters: Reading [%d] bytes of reply data.\n", n);
+  #endif
+
+  _XReadPad(dpy, (char *) supported_methods, n);
+
+  #ifdef TEST
+
+  fprintf(stderr, "******NXGetUnpackParameters: Got reply with methods: ");
+
+  for (i = 0; i < n; i++)
+  {
+    if (supported_methods[i] != 0)
+    {
+      fprintf(stderr, "[%d]", i);
+    }
+  }
+  
+  fprintf(stderr, ".\n");
+
+  #endif
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+/*
+ * Query and enable the MIT-SHM support between the
+ * proxy and the X server. The 'enable' flags must be
+ * true if shared memory PutImages and PutPackedImages
+ * are desired. On return the flags will say if support
+ * has been successfully enabled.
+ *
+ * Note that the the client part is not useful and not
+ * implemented. The size of the segment is chosen by
+ * the proxy. The main purpose of the message is to
+ * reserve the XID that will be used by the remote.
+ */
+
+Status NXGetShmemParameters(Display *dpy, unsigned int *enable_client,
+                                unsigned int *enable_server, unsigned int *client_segment,
+                                    unsigned int *server_segment, unsigned int *client_size,
+                                        unsigned int *server_size)
+{
+  register xNXGetShmemParametersReq *req;
+
+  register int stage;
+
+  xNXGetShmemParametersReply rep;
+
+  /*
+   * Save the previous handler.
+   */
+
+  int (*handler)(Display *, XErrorEvent *) = _XErrorFunction;
+
+  *client_segment = 0;
+  *server_segment = 0;
+
+  if (*enable_client)
+  {
+    *client_segment = XAllocID(dpy);
+  }
+
+  if (*enable_server)
+  {
+    *server_segment = XAllocID(dpy);
+  }
+
+  LockDisplay(dpy);
+
+  _XErrorFunction = _NXInternalReplyErrorFunction;
+
+  for (stage = 0; stage < 3; stage++)
+  {
+    GetReq(NXGetShmemParameters, req);
+
+    req -> stage = stage;
+
+    req -> enableClient = (*enable_client != 0 ? 1 : 0);
+    req -> enableServer = (*enable_server != 0 ? 1 : 0);
+
+    req -> clientSegment = *client_segment;
+    req -> serverSegment = *server_segment;
+
+    #ifdef TEST
+    fprintf(stderr, "******NXGetShmemParameters: Sending message opcode [%d] at stage [%d].\n",
+                X_NXGetShmemParameters, stage);
+    #endif
+
+    #ifdef TEST
+
+    if (stage == 0)
+    {
+      fprintf(stderr, "******NXGetShmemParameters: Enable client is [%u] enable server is [%u].\n",
+                  *enable_client, *enable_server);
+
+      fprintf(stderr, "******NXGetShmemParameters: Client segment is [%u] server segment is [%u].\n",
+                  *client_segment, *server_segment);
+    }
+
+    #endif
+
+    /*
+     * There isn't X server reply in the second stage.
+     * The procedure followed at X server side is:
+     *
+     * Stage 0: Send X_QueryExtension and masquerade
+     *          the reply.
+     *
+     * Stage 1: Allocate the shared memory and send
+     *          X_ShmAttach to the X server.
+     *
+     * Stage 2: Send X_GetInputFocus and masquerade
+     *          the reply.
+     *
+     * The last message is used to force a reply and
+     * collect any X error caused by a failure in the
+     * shared memory initialization.
+     */
+
+    if (stage != 1)
+    {
+      /*
+       * We are only interested in the final reply.
+       */
+
+      if (_XReply(dpy, (xReply *) &rep, 0, xTrue) == xFalse)
+      {
+        #ifdef TEST
+        fprintf(stderr, "******NXGetShmemParameters: Error receiving reply.\n");
+        #endif
+
+        _XErrorFunction = handler;
+
+        UnlockDisplay(dpy);
+
+        SyncHandle();
+
+        return 0;
+      }
+    }
+  }
+
+  /*
+   * Return the settings to client.
+   */
+
+  *enable_client = rep.clientEnabled;
+  *enable_server = rep.serverEnabled;
+
+  *client_size = rep.clientSize;
+  *server_size = rep.serverSize;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetShmemParameters: Got final reply with enabled client [%u] and server [%u].\n",
+              *enable_client, *enable_server);
+
+  fprintf(stderr, "******NXGetShmemParameters: Client segment size [%u] server segment size [%u].\n",
+              *client_size, *server_size);
+  #endif
+
+  _XErrorFunction = handler;
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+/*
+ * Get the path to the font server that can be used by the X
+ * server to tunnel the font connections across the NX link.
+ * The path actually represents the TCP port where the proxy
+ * on the NX client side is listening. The agent can tempora-
+ * rily enable the tunneling when it needs a font that is not
+ * available on the client, for example when the session is
+ * migrated from a different X server.
+ *
+ * Note that it is not advisable to use the font server chan-
+ * nel for other purposes than restoring a font that is found
+ * missing at the time the session is migrated to a different
+ * display. This is because the agent implements a caching of
+ * the list of fonts supported by the client as it needs to
+ * advertise only the fonts that can be opened at both sides.
+ */
+
+Status NXGetFontParameters(Display *dpy, unsigned int path_length, char path_data[])
+{
+  register xNXGetFontParametersReq *req;
+
+  xNXGetFontParametersReply rep;
+
+  register unsigned n;
+
+  #ifdef TEST
+  register unsigned i;
+  #endif
+
+  if (path_length < 1)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXGetFontParameters: No room to store the reply.\n");
+    #endif
+
+    return 0;
+  }
+
+  *path_data = '\0';
+
+  LockDisplay(dpy);
+
+  GetReq(NXGetFontParameters, req);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetFontParameters: Sending message opcode [%d].\n",
+              X_NXGetFontParameters);
+  #endif
+
+  if (_XReply(dpy, (xReply *) &rep, 0, xFalse) == xFalse || rep.length == 0)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXGetFontParameters: Error receiving reply.\n");
+    #endif
+
+    UnlockDisplay(dpy);
+
+    SyncHandle();
+
+    return 0;
+  }
+
+  if ((n = rep.length << 2) > path_length)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXGetFontParameters: Got [%d] bytes of reply data with only room for [%d].\n",
+                n, path_length);
+    #endif
+
+    _XEatData(dpy, (unsigned long) n);
+
+    UnlockDisplay(dpy);
+
+    SyncHandle();
+
+    return 0;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetFontParameters: Reading [%d] bytes of reply data.\n", n);
+  #endif
+
+  _XReadPad(dpy, (char *) path_data, n);
+
+  /*
+   * Check if the string can be fully
+   * contained by the buffer.
+   */
+
+  if (*path_data > path_length - 1)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXGetFontParameters: Inconsistent length in the returned string.\n");
+    #endif
+
+    UnlockDisplay(dpy);
+
+    SyncHandle();
+
+    return 0;
+  }
+
+  #ifdef TEST
+
+  fprintf(stderr, "******NXGetFontParameters: Got font path of [%d] bytes and value [",
+              (int) *path_data);
+
+  for (i = 0; i < *path_data; i++)
+  {
+    fprintf(stderr, "%c", *(path_data + i + 1));
+  }
+  
+  fprintf(stderr, "].\n");
+
+  #endif
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+unsigned int NXAllocSplit(Display *dpy, unsigned int resource)
+{
+  if (resource == NXAnyResource)
+  {
+    for (resource = 0; resource < NXNumberOfResources; resource++)
+    {
+      if (_NXSplitResources[resource] == 0)
+      {
+        _NXSplitResources[resource] = 1;
+
+        #ifdef TEST
+        fprintf(stderr, "******NXAllocSplit: Reserved resource [%u].\n",
+                    resource);
+        #endif
+    
+        return resource;
+      }
+    }
+
+    #ifdef TEST
+    fprintf(stderr, "******NXAllocSplit: WARNING! Resource limit exausted.\n");
+    #endif
+
+    return NXNoResource;
+  }
+  else if (resource >= 0 && resource < NXNumberOfResources)
+  {
+    #ifdef TEST
+
+    if (_NXSplitResources[resource] == 0)
+    {
+      fprintf(stderr, "******NXAllocSplit: Reserved requested resource [%u].\n",
+                  resource);
+    }
+    else
+    {
+      fprintf(stderr, "******NXAllocSplit: Requested resource [%u] already reserved.\n",
+                  resource);
+    }
+
+    #endif
+    
+    _NXSplitResources[resource] = 1;
+  }
+
+  #ifdef PANIC
+  fprintf(stderr, "******NXAllocSplit: PANIC! Can't reserve requested resource [%u].\n",
+              resource);
+  #endif
+
+  return NXNoResource;
+}
+
+/*
+ * Tell the proxy to split the next messages.
+ */
+
+int NXStartSplit(Display *dpy, unsigned int resource, unsigned int mode)
+{
+  register xNXStartSplitReq *req;
+
+  LockDisplay(dpy);
+
+  GetReq(NXStartSplit, req);
+
+  req -> resource = resource;
+  req -> mode     = mode;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXStartSplit: Sending opcode [%d] with resource [%d] mode [%d].\n",
+              X_NXStartSplit, resource, mode);
+  #endif
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+/*
+ * Send the closure of the split sequence and
+ * tell the proxy to send the results.
+ */
+
+int NXEndSplit(Display *dpy, unsigned int resource)
+{
+  register xNXEndSplitReq *req;
+
+  LockDisplay(dpy);
+
+  GetReq(NXEndSplit, req);
+
+  req -> resource = resource;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXEndSplit: Sending opcode [%d] with resource [%d].\n",
+              X_NXStartSplit, resource);
+  #endif
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+/*
+ * This message must be sent whenever the proxy notifies
+ * the client of the completion of a split. If the 'pro-
+ * pagate' field is 0, the proxy will not send the ori-
+ * ginal request to the X server, but will only free the
+ * internal state.
+ */
+
+int NXCommitSplit(Display *dpy, unsigned int resource, unsigned int propagate,
+                      unsigned char request, unsigned int position)
+{
+  register xNXCommitSplitReq *req;
+
+  LockDisplay(dpy);
+
+  GetReq(NXCommitSplit, req);
+
+  req -> resource  = resource;
+  req -> propagate = propagate;
+  req -> request   = request;
+  req -> position  = position;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXCommitSplit: Sending opcode [%d] with resource [%d] propagate [%d] "
+              "request [%d] position [%d].\n", X_NXCommitSplit, resource,
+                  propagate, request, position);
+  #endif
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+int NXAbortSplit(Display *dpy, unsigned int resource)
+{
+  register xNXAbortSplitReq *req;
+
+  LockDisplay(dpy);
+
+  GetReq(NXAbortSplit, req);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXAbortSplit: Sending message opcode [%d] with resource [%u].\n",
+              X_NXAbortSplit, resource);
+  #endif
+
+  req -> resource = resource;
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+int NXFinishSplit(Display *dpy, unsigned int resource)
+{
+  register xNXFinishSplitReq *req;
+
+  LockDisplay(dpy);
+
+  GetReq(NXFinishSplit, req);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXFinishSplit: Sending message opcode [%d] with resource [%u].\n",
+              X_NXFinishSplit, resource);
+  #endif
+
+  req -> resource = resource;
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+int NXFreeSplit(Display *dpy, unsigned int resource)
+{
+  register xNXFreeSplitReq *req;
+
+  if (_NXSplitResources[resource] != 0)
+  {
+    LockDisplay(dpy);
+
+    GetReq(NXFreeSplit, req);
+
+    #ifdef TEST
+    fprintf(stderr, "******NXFreeSplit: Sending message opcode [%d] with resource [%u].\n",
+                X_NXFreeSplit, resource);
+    #endif
+
+    req -> resource = resource;
+
+    UnlockDisplay(dpy);
+
+    SyncHandle();
+
+    #ifdef TEST
+    fprintf(stderr, "******NXFreeSplit: Making the resource [%u] newly available.\n",
+                resource);
+    #endif
+
+    _NXSplitResources[resource] = 0;
+  }
+  #ifdef TEST
+  else
+  {
+    fprintf(stderr, "******NXFreeSplit: Nothing to do for resource [%u].\n",
+                resource);
+  }
+  #endif
+
+  return 1;
+}
+
+/*
+ * Tell to remote proxy to discard expose events
+ * of one or more types.
+ */
+
+int NXSetExposeParameters(Display *dpy, int expose, int graphics_expose, int no_expose)
+{
+  register xNXSetExposeParametersReq *req;
+
+  LockDisplay(dpy);
+
+  GetReq(NXSetExposeParameters, req);
+
+  req -> expose         = expose;
+  req -> graphicsExpose = graphics_expose;
+  req -> noExpose       = no_expose;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetExposeParameters: Sending message opcode [%d] with flags [%d][%d][%d].\n",
+              X_NXSetExposeParameters, req -> expose, req -> graphicsExpose, req -> noExpose);
+  #endif
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+/*
+ * Tell to the local proxy how to handle the next requests.
+ */
+
+int NXSetCacheParameters(Display *dpy, int enable_cache, int enable_split,
+                             int enable_save, int enable_load)
+{
+  register xNXSetCacheParametersReq *req;
+
+  LockDisplay(dpy);
+
+  GetReq(NXSetCacheParameters, req);
+
+  req -> enableCache = enable_cache;
+  req -> enableSplit = enable_split;
+  req -> enableSave  = enable_save;
+  req -> enableLoad  = enable_load;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetCacheParameters: Sending message opcode [%d] with "
+              "flags [%d][%d][%d][%d].\n", X_NXSetCacheParameters, req -> enableCache,
+                  req -> enableSplit, req -> enableSave, req -> enableLoad);
+  #endif
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+unsigned int NXAllocUnpack(Display *dpy, unsigned int resource)
+{
+  if (resource == NXAnyResource)
+  {
+    for (resource = 0; resource < NXNumberOfResources; resource++)
+    {
+      if (_NXUnpackResources[resource] == 0)
+      {
+        _NXUnpackResources[resource] = 1;
+
+        #ifdef TEST
+        fprintf(stderr, "******NXAllocUnpack: Reserved resource [%u].\n",
+                    resource);
+        #endif
+    
+        return resource;
+      }
+    }
+
+    #ifdef TEST
+    fprintf(stderr, "******NXAllocUnpack: WARNING! Resource limit exausted.\n");
+    #endif
+
+    return NXNoResource;
+  }
+  else if (resource >= 0 && resource < NXNumberOfResources)
+  {
+    #ifdef TEST
+
+    if (_NXUnpackResources[resource] == 0)
+    {
+      fprintf(stderr, "******NXAllocUnpack: Reserved requested resource [%u].\n",
+                  resource);
+    }
+    else
+    {
+      fprintf(stderr, "******NXAllocUnpack: Requested resource [%u] already reserved.\n",
+                  resource);
+    }
+
+    #endif
+    
+    _NXUnpackResources[resource] = 1;
+  }
+
+  #ifdef PANIC
+  fprintf(stderr, "******NXAllocUnpack: PANIC! Can't reserve requested resource [%u].\n",
+              resource);
+  #endif
+
+  return NXNoResource;
+}
+
+int NXSetUnpackGeometry(Display *dpy, unsigned int resource, Visual *visual)
+{
+  register xNXSetUnpackGeometryReq *req;
+
+  LockDisplay(dpy);
+
+  GetReq(NXSetUnpackGeometry, req);
+
+  req -> resource = resource;
+
+  req -> depth1Bpp  = _XGetBitsPerPixel(dpy, 1);
+  req -> depth4Bpp  = _XGetBitsPerPixel(dpy, 4);
+  req -> depth8Bpp  = _XGetBitsPerPixel(dpy, 8);
+  req -> depth16Bpp = _XGetBitsPerPixel(dpy, 16);
+  req -> depth24Bpp = _XGetBitsPerPixel(dpy, 24);
+  req -> depth32Bpp = _XGetBitsPerPixel(dpy, 32);
+
+  if (visual != NULL)
+  {
+    req -> redMask   = visual -> red_mask;
+    req -> greenMask = visual -> green_mask;
+    req -> blueMask  = visual -> blue_mask;
+  }
+  else
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXSetUnpackGeometry: PANIC! Can't set the geometry without a visual.\n");
+    #endif
+
+    UnGetReq(NXSetUnpackGeometry);
+
+    UnlockDisplay(dpy);
+
+    return -1;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetUnpackGeometry: Resource [%u] Depth/Bpp [1/%d][4/%d][8/%d]"
+              "[16/%d][24/%d][32/%d].\n", resource, req -> depth1Bpp, req -> depth4Bpp,
+                  req -> depth8Bpp, req -> depth16Bpp, req -> depth24Bpp, req -> depth32Bpp);
+
+  fprintf(stderr, "******NXSetUnpackGeometry: red [0x%x] green [0x%x] blue [0x%x].\n",
+               (unsigned) req -> redMask, (unsigned) req -> greenMask, (unsigned) req -> blueMask);
+  #endif
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+/*
+ * Store a colormap table on the remote side.
+ * The colormap can then be used to unpack
+ * an image.
+ */
+
+int NXSetUnpackColormap(Display *dpy, unsigned int resource, unsigned int method,
+                            unsigned int entries, const char *data, unsigned int data_length)
+{
+  register xNXSetUnpackColormapReq *req;
+
+  register int dst_data_length;
+
+  LockDisplay(dpy);
+
+  GetReq(NXSetUnpackColormap, req);
+
+  req -> resource  = resource;
+  req -> method    = method;
+
+  req -> srcLength = data_length;
+  req -> dstLength = entries << 2;
+
+  dst_data_length = ROUNDUP(data_length, 4);
+
+  req -> length += (dst_data_length >> 2);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetUnpackColormap: Resource [%u] data size [%u] destination "
+              "data size [%u].\n", resource, data_length, dst_data_length);
+  #endif
+
+  if (data_length > 0)
+  {
+    if (dpy -> bufptr + dst_data_length <= dpy -> bufmax)
+    {
+      /*
+       * Clean the padding bytes in the request.
+       */
+
+      *((int *) (dpy -> bufptr + dst_data_length - 4)) = 0x0;
+
+      memcpy(dpy -> bufptr, data, data_length);
+
+      dpy -> bufptr += dst_data_length;
+    }
+    else
+    {
+      /*
+       * The _XSend() will pad the request for us.
+       */
+
+      _XSend(dpy, data, data_length);
+    }
+  }
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+/*
+ * Store data of the alpha blending channel
+ * that will be combined with the next image
+ * to be unpacked.
+ */
+
+int NXSetUnpackAlpha(Display *dpy, unsigned int resource, unsigned int method,
+                         unsigned int entries, const char *data, unsigned int data_length)
+{
+  register xNXSetUnpackAlphaReq *req;
+
+  register unsigned int dst_data_length;
+
+  LockDisplay(dpy);
+
+  GetReq(NXSetUnpackAlpha, req);
+
+  req -> resource  = resource;
+  req -> method    = method;
+
+  req -> srcLength = data_length;
+  req -> dstLength = entries;
+
+  dst_data_length = ROUNDUP(data_length, 4);
+
+  req -> length += (dst_data_length >> 2);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetUnpackAlpha: Resource [%u] data size [%u] destination data size [%u].\n",
+              resource, data_length, dst_data_length);
+  #endif
+
+  if (data_length > 0)
+  {
+    if (dpy -> bufptr + dst_data_length <= dpy -> bufmax)
+    {
+      /*
+       * Clean the padding bytes in the request.
+       */
+
+      *((int *) (dpy -> bufptr + dst_data_length - 4)) = 0x0;
+
+      memcpy(dpy -> bufptr, data, data_length);
+
+      dpy -> bufptr += dst_data_length;
+    }
+    else
+    {
+      /*
+       * The _XSend() will pad the request for us.
+       */
+
+      _XSend(dpy, data, data_length);
+    }
+  }
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+/*
+ * Compatibility versions to be used when
+ * connected to a 1.X.X proxy.
+ */
+
+/*
+ * These are for compatibility with the 1.X.X
+ * versions.
+ */
+
+#define sz_xNXSetUnpackColormapCompatReq        8
+
+typedef struct _NXSetUnpackColormapCompatReq {
+    CARD8  reqType;
+    CARD8  resource;
+    CARD16 length B16;
+    CARD32 entries B32;
+} xNXSetUnpackColormapCompatReq;
+
+#define X_NXSetUnpackColormapCompat  X_NXSetUnpackColormap
+
+int NXSetUnpackColormapCompat(Display *dpy, unsigned int resource,
+                                  unsigned int entries, const char *data)
+{
+  register xNXSetUnpackColormapCompatReq *req;
+
+  register char *dst_data;
+
+  register int dst_data_length;
+
+  #ifdef DUMP
+
+  int i;
+
+  #endif
+
+  LockDisplay(dpy);
+
+  GetReq(NXSetUnpackColormapCompat, req);
+
+  req -> resource = resource;
+  req -> entries  = entries;
+
+  dst_data_length = entries << 2;
+
+  req -> length += (dst_data_length >> 2);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetUnpackColormapCompat: Resource [%u] number of entries [%u] "
+              "destination data size [%u].\n", resource, entries, dst_data_length);
+  #endif
+
+  if (entries > 0)
+  {
+    if ((dpy -> bufptr + dst_data_length) <= dpy -> bufmax)
+    {
+      dst_data = dpy -> bufptr;
+    }
+    else
+    {
+      if ((dst_data = _XAllocScratch(dpy, dst_data_length)) == NULL)
+      {
+        #ifdef PANIC
+        fprintf(stderr, "******NXSetUnpackColormapCompat: PANIC! Cannot allocate memory.\n");
+        #endif
+
+        UnGetReq(NXSetUnpackColormapCompat);
+
+        UnlockDisplay(dpy);
+
+        return -1;
+      }
+    }
+
+    memcpy(dst_data, data, entries << 2);
+
+    #ifdef DUMP
+
+    fprintf(stderr, "******NXSetUnpackColormapCompat: Dumping colormap entries:\n");
+
+    for (i = 0; i < entries; i++)
+    {
+      fprintf(stderr, "******NXSetUnpackColormapCompat: [%d] -> [0x%x].\n",
+                  i, *((int *) (dst_data + (i * 4))));
+    }
+
+    #endif
+
+    if (dst_data == dpy -> bufptr)
+    {
+      dpy -> bufptr += dst_data_length;
+    }
+    else
+    {
+      _XSend(dpy, dst_data, dst_data_length);
+    }
+  }
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+#define sz_xNXSetUnpackAlphaCompatReq  8
+
+typedef struct _NXSetUnpackAlphaCompatReq {
+    CARD8  reqType;
+    CARD8  resource;
+    CARD16 length B16;
+    CARD32 entries B32;
+} xNXSetUnpackAlphaCompatReq;
+
+#define X_NXSetUnpackAlphaCompat  X_NXSetUnpackAlpha
+
+int NXSetUnpackAlphaCompat(Display *dpy, unsigned int resource,
+                               unsigned int entries, const char *data)
+{
+  register xNXSetUnpackAlphaCompatReq *req;
+
+  register char *dst_data;
+
+  register unsigned int dst_data_length;
+
+  #ifdef DUMP
+
+  int i;
+
+  #endif
+
+  LockDisplay(dpy);
+
+  GetReq(NXSetUnpackAlphaCompat, req);
+
+  req -> resource = resource;
+  req -> entries  = entries;
+
+  dst_data_length = ROUNDUP(entries, 4);
+
+  req -> length += (dst_data_length >> 2);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXSetUnpackAlphaCompat: Resource [%u] number of entries [%u] "
+              "destination data size [%u].\n", resource, entries, dst_data_length);
+  #endif
+
+  if (entries > 0)
+  {
+    if ((dpy -> bufptr + dst_data_length) <= dpy -> bufmax)
+    {
+      dst_data = dpy -> bufptr;
+    }
+    else
+    {
+      if ((dst_data = _XAllocScratch(dpy, dst_data_length)) == NULL)
+      {
+        #ifdef PANIC
+        fprintf(stderr, "******NXSetUnpackAlphaCompat: PANIC! Cannot allocate memory.\n");
+        #endif
+
+        UnGetReq(NXSetUnpackAlphaCompat);
+
+        UnlockDisplay(dpy);
+
+        return -1;
+      }
+    }
+
+    memcpy(dst_data, data, entries);
+
+    if (dst_data_length != entries)
+    {
+      memset(dst_data + entries, 0, dst_data_length - entries);
+    }
+
+    #ifdef DUMP
+
+    fprintf(stderr, "******NXSetUnpackAlphaCompat: Dumping alpha channel data:\n");
+
+    for (i = 0; i < dst_data_length; i++)
+    {
+      fprintf(stderr, "******NXSetUnpackAlphaCompat: [%d] -> [0x%02x].\n",
+                  i, ((unsigned int) *(dst_data + i)) & 0xff);
+    }
+
+    #endif
+
+    if (dst_data == dpy -> bufptr)
+    {
+      dpy -> bufptr += dst_data_length;
+    }
+    else
+    {
+      _XSend(dpy, dst_data, dst_data_length);
+    }
+  }
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+/*
+ * Free any geometry, colormap and alpha channel
+ * data stored by the remote proxy to unpack the
+ * image. Resource, as usual, must be a value
+ * between 0 and 255.
+ */
+
+int NXFreeUnpack(Display *dpy, unsigned int resource)
+{
+  register xNXFreeUnpackReq *req;
+
+  if (_NXUnpackResources[resource] != 0)
+  {
+    LockDisplay(dpy);
+
+    GetReq(NXFreeUnpack, req);
+
+    #ifdef TEST
+    fprintf(stderr, "******NXFreeUnpack: Sending message opcode [%d] with resource [%u].\n",
+                X_NXFreeUnpack, resource);
+    #endif
+
+    req -> resource = resource;
+
+    UnlockDisplay(dpy);
+
+    SyncHandle();
+
+    #ifdef TEST
+    fprintf(stderr, "******NXFreeUnpack: Making the resource [%u] newly available.\n",
+                resource);
+    #endif
+
+    _NXUnpackResources[resource] = 0;
+  }
+  #ifdef TEST
+  else
+  {
+    fprintf(stderr, "******NXFreeUnpack: Nothing to do for resource [%u].\n",
+                resource);
+  }
+  #endif
+
+  return 1;
+}
+
+/*
+ * Wrapper of XCreateImage(). Note that we use offset
+ * field of XImage to store size of source image in
+ * packed format. Note also that method is currently
+ * not stored in the NXignored.
+ */
+
+NXPackedImage *NXCreatePackedImage(Display *dpy, Visual *visual, unsigned int method,
+                                       unsigned int depth, int format, char *data,
+                                           int data_length, unsigned int width,
+                                               unsigned int height, int bitmap_pad,
+                                                   int bytes_per_line)
+{
+  XImage* image;
+
+  image = XCreateImage(dpy, visual, depth, format, 0, data,
+                           width, height, bitmap_pad, bytes_per_line);
+
+  if (image != NULL)
+  {
+    image -> xoffset = data_length;
+  }
+
+  return (NXPackedImage *) image;
+}
+
+/*
+ * Wrapper of XDestroyImage().
+ */
+
+int NXDestroyPackedImage(NXPackedImage *image)
+{
+  return XDestroyImage((XImage *) image);
+}
+
+/*
+ * Clean the image data directly in the current buffer.
+ */
+
+int NXCleanImage(XImage *image)
+{
+  #ifdef TEST
+  fprintf(stderr, "******NXCleanImage: Cleaning image with format [%d] depth [%d] "
+              "bits per pixel [%d].\n", image -> format, image -> depth,
+                  image -> bits_per_pixel);
+  #endif
+
+  if (image -> format == ZPixmap)
+  {
+    if (image -> depth == 1)
+    {
+      return CleanXYImage(image);
+    }
+    else
+    {
+      return CleanZImage(image);
+    }
+  }
+  else
+  {
+    return CleanXYImage(image);
+  }
+}
+
+NXPackedImage *NXPackImage(Display *dpy, XImage *src_image, unsigned int method)
+{
+  XImage *dst_image;
+
+  const ColorMask *mask;
+
+  unsigned int dst_data_size;
+  unsigned int dst_packed_data_size;
+
+  unsigned int dst_bits_per_pixel;
+  unsigned int dst_packed_bits_per_pixel;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXPackImage: Going to pack a new image with method [%d].\n",
+              method);
+  #endif
+
+  /*
+   * Get the mask out of the method and 
+   * check if the visual is supported by
+   * the color reduction algorithm.
+   */
+
+  mask = MethodColorMask(method);
+
+  if (mask == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXPackImage: WARNING! No mask to apply for pack method [%d].\n",
+                method);
+    #endif
+
+    return NULL;
+  }
+  else if (CanMaskImage(src_image, mask) == 0)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXPackImage: PANIC! Invalid source with format [%d] depth [%d] bits per pixel [%d].\n",
+                src_image -> format, src_image -> depth, src_image -> bits_per_pixel);
+
+    fprintf(stderr, "******NXPackImage: PANIC! Visual colormask is red 0x%lx green 0x%lx blue 0x%lx.\n",
+                src_image -> red_mask, src_image -> green_mask, src_image -> blue_mask);
+    #endif
+
+    return NULL;
+  }
+
+  /*
+   * Create a destination image from
+   * source and apply the color mask.
+   */
+
+  if ((dst_image = (XImage *) Xmalloc(sizeof(XImage))) == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXPackImage: PANIC! Cannot allocate [%d] bytes for the image.\n",
+                (int) sizeof(XImage));
+    #endif
+
+    return NULL;
+  }
+
+  *dst_image = *src_image;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXPackImage: Source width [%d], bytes per line [%d] with depth [%d].\n",
+              src_image -> width, src_image -> bytes_per_line, src_image -> depth);
+  #endif
+
+  dst_data_size = src_image -> bytes_per_line * src_image -> height;
+
+  dst_image -> data = Xmalloc(dst_data_size);
+
+  if (dst_image -> data == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXPackImage: PANIC! Cannot allocate [%d] bytes for masked image data.\n",
+                dst_data_size);
+    #endif
+
+    Xfree(dst_image);
+
+    return NULL;
+  }
+
+  /*
+   * If the pixel resulting from the mask
+   * needs more bits than available, then
+   * just clean the padding bits in the
+   * image.
+   */
+
+  dst_bits_per_pixel = dst_image -> bits_per_pixel;
+  dst_packed_bits_per_pixel = MethodBitsPerPixel(method);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXPackImage: Destination depth [%d], bits per pixel [%d], packed bits per pixel [%d].\n",
+             dst_image -> depth, dst_bits_per_pixel, dst_packed_bits_per_pixel);
+  #endif
+
+  if (dst_packed_bits_per_pixel > dst_bits_per_pixel ||
+          ShouldMaskImage(src_image, mask) == 0)
+  {
+    /*
+     * Should use the same data for source
+     * and destination to avoid the memcpy.
+     */
+
+    if (CopyAndCleanImage(src_image, dst_image) <= 0)
+    {
+      #ifdef PANIC
+      fprintf(stderr, "******NXPackImage: PANIC! Failed to clean the image.\n");
+      #endif
+
+      Xfree(dst_image -> data);
+
+      Xfree(dst_image);
+
+      return NULL;
+    }
+  }
+  else if (MaskImage(mask, src_image, dst_image) <= 0)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXPackImage: PANIC! Failed to apply the color mask.\n");
+    #endif
+
+    Xfree(dst_image -> data);
+
+    Xfree(dst_image);
+
+    return NULL;
+  }
+
+  /*
+   * Let's pack the same pixels in fewer bytes.
+   * Note that we save a new memory allocation
+   * by using the same image as source and des-
+   * tination. This means that PackImage() must
+   * be able to handle ovelapping areas.
+   */
+
+  #ifdef TEST
+  fprintf(stderr, "******NXPackImage: Plain bits per pixel [%d], data size [%d].\n",
+              dst_bits_per_pixel, dst_data_size);
+  #endif
+
+  dst_packed_data_size = dst_data_size * dst_packed_bits_per_pixel /
+                              dst_bits_per_pixel;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXPackImage: Packed bits per pixel [%d], data size [%d].\n",
+              dst_packed_bits_per_pixel, dst_packed_data_size);
+  #endif
+
+  if (PackImage(method, dst_data_size, dst_image,
+                    dst_packed_data_size, dst_image) <= 0)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXPackImage: PANIC! Failed to pack image from [%d] to [%d] bits per pixel.\n",
+                dst_bits_per_pixel, dst_packed_bits_per_pixel);
+    #endif
+
+    Xfree(dst_image -> data);
+
+    Xfree(dst_image);
+
+    return NULL;
+  }
+
+  /*
+   * Save data size in xoffset field
+   * to comply with NX packed images.
+   */
+
+  dst_image -> xoffset = dst_packed_data_size;
+
+  return dst_image;
+}
+
+/*
+ * NXInPlacePackImage creates a NXPackedImage
+ * from a XImage, sharing the same data buffer.
+ * Is up to the caller to free the data buffer
+ * only once.
+ */
+
+XImage *NXInPlacePackImage(Display *dpy, XImage *src_image, unsigned int method)
+{
+  XImage *dst_image;
+
+  const ColorMask *mask;
+
+  unsigned int dst_data_size;
+  unsigned int dst_packed_data_size;
+
+  unsigned int dst_bits_per_pixel;
+  unsigned int dst_packed_bits_per_pixel;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXInPlacePackImage: Going to pack a new image with method [%d].\n",
+              method);
+  #endif
+
+  /*
+   * Get mask out of method and check if
+   * visual is supported by current color
+   * reduction algorithm.
+   */
+
+  mask = MethodColorMask(method);
+
+  if (mask == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXInPlacePackImage: WARNING! No mask to apply for pack method [%d].\n",
+                method);
+    #endif
+
+    return NULL;
+  }
+  else if (CanMaskImage(src_image, mask) == 0)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXInPlacePackImage: PANIC! Invalid source with format [%d] depth [%d] bits per pixel [%d].\n",
+                src_image -> format, src_image -> depth, src_image -> bits_per_pixel);
+
+    fprintf(stderr, "******NXInPlacePackImage: PANIC! Visual colormask is red 0x%lx green 0x%lx blue 0x%lx.\n",
+                src_image -> red_mask, src_image -> green_mask, src_image -> blue_mask);
+    #endif
+    return NULL;
+  }
+
+  /*
+   * Create a destination image from
+   * source and apply the color mask.
+   */
+
+  if ((dst_image = (XImage *) Xmalloc(sizeof(XImage))) == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXInPlacePackImage: PANIC! Cannot allocate [%d] bytes for the image.\n",
+                (int) sizeof(XImage));
+    #endif
+
+    return NULL;
+  }
+
+  *dst_image = *src_image;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXInPlacePackImage: Source width [%d], bytes per line [%d] with depth [%d].\n",
+              src_image -> width, src_image -> bytes_per_line, src_image -> depth);
+  #endif
+
+  dst_data_size = src_image -> bytes_per_line * src_image -> height;
+
+  dst_image -> data = src_image -> data;
+
+  /*
+   * If pixel resulting from mask needs
+   * more bits than available, then just
+   * clean the pad bits in image.
+   */
+
+  dst_bits_per_pixel = dst_image -> bits_per_pixel;
+  dst_packed_bits_per_pixel = MethodBitsPerPixel(method);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXInPlacePackImage: Destination depth [%d], bits per pixel [%d], packed bits per pixel [%d].\n",
+              dst_image -> depth, dst_bits_per_pixel, dst_packed_bits_per_pixel);
+  #endif
+
+  if (dst_packed_bits_per_pixel > dst_bits_per_pixel ||
+          ShouldMaskImage(src_image, mask) == 0)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXInPlacePackImage: Just clean image packed_bits_per_pixel[%d], bits_per_pixel[%d].\n",
+                dst_packed_bits_per_pixel, dst_bits_per_pixel);
+    #endif
+
+    if (NXCleanImage(dst_image) <= 0)
+    {
+      #ifdef PANIC
+      fprintf(stderr, "******NXInPlacePackImage: PANIC! Failed to clean the image.\n");
+      #endif
+
+      Xfree(dst_image);
+
+      return NULL;
+    }
+  }
+  else if (MaskInPlaceImage(mask, dst_image) <= 0)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXInPlacePackImage: PANIC! Failed to apply the color mask.\n");
+    #endif
+
+    Xfree(dst_image);
+
+    return NULL;
+  }
+
+  /*
+   * Let's pack the same pixels in fewer bytes.
+   * Note that we save a new memory allocation
+   * by using the same image as source and des-
+   * tination. This means that PackImage() must
+   * be able to handle ovelapping areas.
+   */
+
+  #ifdef TEST
+  fprintf(stderr, "******NXInPlacePackImage: Plain bits per pixel [%d], data size [%d].\n",
+             dst_bits_per_pixel, dst_data_size);
+  #endif
+
+  dst_packed_data_size = dst_data_size * dst_packed_bits_per_pixel /
+    dst_bits_per_pixel;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXInPlacePackImage: Packed bits per pixel [%d], data size [%d].\n",
+             dst_packed_bits_per_pixel, dst_packed_data_size);
+  #endif
+
+  /*
+   * Save data size in xoffset field
+   * to comply with NX packed images.
+   */
+
+  dst_image -> xoffset = dst_packed_data_size;
+
+  return dst_image;
+}
+
+int NXPutPackedImage(Display *dpy, unsigned int resource, Drawable drawable,
+                         void *gc, NXPackedImage *image, unsigned int method,
+                             unsigned int depth, int src_x, int src_y, int dst_x,
+                                 int dst_y, unsigned int width, unsigned int height)
+{
+  register xNXPutPackedImageReq *req;
+
+  register unsigned int src_data_length;
+  register unsigned int dst_data_length;
+
+  LockDisplay(dpy);
+
+  FlushGC(dpy, (GC) gc);
+
+  GetReq(NXPutPackedImage, req);
+
+  req -> resource = resource;
+  req -> drawable = drawable;
+  req -> gc = ((GC) gc) -> gid;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXPutPackedImage: Image resource [%d] drawable [%d] gc [%d].\n",
+              req -> resource, (int) req -> drawable, (int) req -> gc);
+  #endif
+
+  /*
+   * There is no leftPad field in request. We only
+   * support a leftPad of 0. Anyway, X imposes a
+   * leftPad of 0 in case of ZPixmap format.
+   */
+
+  req -> format = image -> format;
+
+  /*
+   * Source depth, as well as width and height,
+   * are taken from the image structure.
+   */
+
+  req -> srcDepth = image -> depth;
+
+  req -> srcX = src_x;
+  req -> srcY = src_y;
+
+  req -> srcWidth  = image -> width;
+  req -> srcHeight = image -> height;
+
+  /*
+   * The destination depth is provided
+   * by the caller.
+   */
+
+  req -> dstDepth = depth;
+
+  req -> dstX = dst_x;
+  req -> dstY = dst_y;
+
+  req -> dstWidth  = width;
+  req -> dstHeight = height;
+
+  req -> method = method;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXPutPackedImage: Source image depth [%d] destination depth [%d] "
+              "method [%d].\n", req -> srcDepth, req -> dstDepth, req -> method);
+  #endif
+
+  /*
+   * Source data length is the size of image in packed format,
+   * as stored in xoffset field of XImage. Destination data
+   * size is calculated according to bytes per line of target
+   * image, so the caller must provide the right depth at the
+   * time XImage structure is created.
+   */
+
+  req -> srcLength = image -> xoffset;
+
+  if (image -> width == (int) width &&
+          image -> height == (int) height)
+  {
+    req -> dstLength = image -> bytes_per_line * image -> height;
+  }
+  else if (image -> format == ZPixmap)
+  {
+    req -> dstLength = ROUNDUP((image -> bits_per_pixel * width),
+                                    image -> bitmap_pad) * height >> 3;
+  }
+  else
+  {
+    req -> dstLength = ROUNDUP(width, image -> bitmap_pad) * height >> 3;
+  }
+
+  src_data_length = image -> xoffset;
+
+  dst_data_length = ROUNDUP(src_data_length, 4);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXPutPackedImage: Source data length [%d] request data length [%d].\n",
+              src_data_length, dst_data_length);
+  #endif
+
+  req -> length += (dst_data_length >> 2);
+
+  if (src_data_length > 0)
+  {
+    if (dpy -> bufptr + dst_data_length <= dpy -> bufmax)
+    {
+      /*
+       * Clean the padding bytes in the request.
+       */
+
+      *((int *) (dpy -> bufptr + dst_data_length - 4)) = 0x0;
+
+      memcpy(dpy -> bufptr, image -> data, src_data_length);
+
+      dpy -> bufptr += dst_data_length;
+    }
+    else
+    {
+      /*
+       * The _XSend() will pad the request for us.
+       */
+
+      _XSend(dpy, image -> data, src_data_length);
+    }
+  }
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+int NXAllocColors(Display *dpy, Colormap colormap, unsigned int entries,
+                      XColor screens_in_out[], Bool results_in_out[])
+{
+  Status result = 0;
+  xAllocColorReply rep;
+  register xAllocColorReq *req;
+
+  Bool alloc_error = False;
+
+  register unsigned int i;
+
+  LockDisplay(dpy);
+
+  for (i = 0; i < entries; i++)
+  {
+    GetReq(AllocColor, req);
+
+    req -> cmap  = colormap;
+
+    req -> red   = screens_in_out[i].red;
+    req -> green = screens_in_out[i].green;
+    req -> blue  = screens_in_out[i].blue;
+  }
+
+  for (i = 0; i < entries; i++)
+  {
+    result = _XReply(dpy, (xReply *) &rep, 0, xTrue);
+
+    if (result)
+    {
+      screens_in_out[i].pixel = rep.pixel;
+
+      screens_in_out[i].red   = rep.red;
+      screens_in_out[i].green = rep.green;
+      screens_in_out[i].blue  = rep.blue;
+      
+      results_in_out[i] = True;
+    } 
+    else 
+    {
+      results_in_out[i] = False;
+
+      alloc_error = True;
+    }
+  }
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return (alloc_error == False);
+}
+
+char *NXEncodeColormap(const char *src_data, unsigned int src_size, unsigned int *dst_size)
+{
+  return ColormapCompressData(src_data, src_size, dst_size);
+}
+
+char *NXEncodeAlpha(const char *src_data, unsigned int src_size, unsigned int *dst_size)
+{
+  return AlphaCompressData(src_data, src_size, dst_size);
+}
+
+NXPackedImage *NXEncodeRgb(XImage *src_image, unsigned int method, unsigned int quality)
+{
+  NXPackedImage *dst_image = NULL;
+
+  unsigned int dst_size;
+
+  /*
+   * Create a new image structure as a copy
+   * of the source.
+   */
+
+  if ((dst_image = (NXPackedImage *) Xmalloc(sizeof(NXPackedImage))) == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodeRgb: PANIC! Cannot allocate [%d] bytes for the image.\n",
+                (int) sizeof(XImage));
+    #endif
+
+    return NULL;
+  }
+
+  *dst_image = *src_image;
+
+  dst_image -> data = RgbCompressData(src_image, &dst_size);
+
+  if (dst_image -> data == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodeRgb: PANIC! Rgb compression failed.\n");
+    #endif
+
+    Xfree(dst_image);
+
+    return NULL;
+  }
+
+  /*
+   * Store the Rgb size in the xoffset field.
+   */
+
+  dst_image -> xoffset = dst_size;
+
+  return dst_image;
+}
+
+NXPackedImage *NXEncodeRle(XImage *src_image, unsigned int method, unsigned int quality)
+{
+  NXPackedImage *dst_image = NULL;
+
+  unsigned int dst_size;
+
+  /*
+   * Create a new image structure as a copy
+   * of the source.
+   */
+
+  if ((dst_image = (NXPackedImage *) Xmalloc(sizeof(NXPackedImage))) == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodeRle: PANIC! Cannot allocate [%d] bytes for the image.\n",
+                (int) sizeof(XImage));
+    #endif
+
+    return NULL;
+  }
+
+  *dst_image = *src_image;
+
+  dst_image -> data = RleCompressData(src_image, &dst_size);
+
+  if (dst_image -> data == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodeRle: PANIC! Rle compression failed.\n");
+    #endif
+
+    Xfree(dst_image);
+
+    return NULL;
+  }
+
+  /*
+   * Store the Rle size in the xoffset field.
+   */
+
+  dst_image -> xoffset = dst_size;
+
+  return dst_image;
+}
+
+NXPackedImage *NXEncodeBitmap(XImage *src_image, unsigned int method, unsigned int quality)
+{
+  NXPackedImage *dst_image = NULL;
+
+  unsigned int dst_size;
+
+  /*
+   * Create a new image structure as a copy
+   * of the source.
+   */
+
+  if ((dst_image = (NXPackedImage *) Xmalloc(sizeof(NXPackedImage))) == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodeBitmap: PANIC! Cannot allocate [%d] bytes for the image.\n",
+                (int) sizeof(XImage));
+    #endif
+
+    return NULL;
+  }
+
+  *dst_image = *src_image;
+
+  dst_image -> data = BitmapCompressData(src_image, &dst_size);
+
+  if (dst_image -> data == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodeBitmap: PANIC! Bitmap compression failed.\n");
+    #endif
+
+    Xfree(dst_image);
+
+    return NULL;
+  }
+
+  /*
+   * Store the bitmap size in the xoffset field.
+   */
+
+  dst_image -> xoffset = dst_size;
+
+  return dst_image;
+}
+
+NXPackedImage *NXEncodeJpeg(XImage *src_image, unsigned int method, unsigned int quality)
+{
+  NXPackedImage *dst_image = NULL;
+
+  int size;
+
+  /*
+   * Check if the bpp of the image is valid
+   * for the Jpeg compression.
+   */
+
+  if (src_image -> bits_per_pixel < 15)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodeJpeg: PANIC! Invalid bpp for Jpeg compression [%d]\n.",
+                src_image -> bits_per_pixel);
+    #endif
+
+    return NULL;
+  }
+
+  /*
+   * Create the destination image as a copy
+   * of the source.
+   */
+
+  if ((dst_image = (NXPackedImage *) Xmalloc(sizeof(NXPackedImage))) == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodeJpeg: PANIC! Cannot allocate [%d] bytes for the Jpeg image.\n",
+                (int) sizeof(NXPackedImage));
+    #endif
+
+    return NULL;
+  }
+
+  *dst_image = *src_image;
+
+  dst_image -> data = JpegCompressData(src_image, quality, &size);
+
+  if (dst_image -> data == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodeJpeg: PANIC! Jpeg compression failed.\n");
+    #endif
+
+    Xfree(dst_image);
+
+    return NULL;
+  }
+
+  /*
+   * Store the Jpeg size in the xoffset field.
+   */
+
+  dst_image -> xoffset = size;
+
+  return dst_image;
+}
+
+NXPackedImage *NXEncodePng(XImage *src_image, unsigned int method, unsigned int quality)
+{
+  NXPackedImage *dst_image = NULL;
+
+  int size;
+
+  /*
+   * Check if the bpp of the image is valid
+   * for png compression.
+   */
+
+  if (src_image -> bits_per_pixel < 15)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodePng: PANIC! Invalid bpp for Png compression [%d].\n",
+                src_image -> bits_per_pixel);
+    #endif
+
+    return NULL;
+  }
+
+  if ((dst_image = (NXPackedImage *) Xmalloc(sizeof(NXPackedImage))) == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodePng: PANIC! Cannot allocate [%d] bytes for the Png image.\n",
+                (int) sizeof(NXPackedImage));
+    #endif
+
+    return NULL;
+  }
+
+  *dst_image = *src_image;
+
+  dst_image -> data = PngCompressData(dst_image, &size);
+
+  if (dst_image -> data == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXEncodePng: PANIC! Png compression failed.\n");
+    #endif
+
+    Xfree(dst_image);
+
+    return NULL;
+  }
+
+  /*
+   * Store the Png size in the xoffset field.
+   */
+
+  dst_image -> xoffset = size;
+
+  return dst_image;
+}
+
+int NXEncodeColors(XImage *src_image, NXColorTable *color_table, int nb_max)
+{
+  int x, y, t, p;
+
+  long pixel;
+
+  /*
+   * We need a smarter way to extract
+   * the colors from the image and
+   * create a color table.
+   */
+
+  memset(color_table, 0, nb_max * sizeof(NXColorTable));
+
+  for (x = 0, p = 0; x < src_image -> width; x++)
+  {
+    for (y = 0; y < src_image -> height; y++)
+    {
+      pixel  = XGetPixel(src_image, x, y);
+
+      for (t = 0; t < nb_max; t++)
+      {
+        if ( color_table[t].found == 0)
+        {
+          color_table[t].pixel =  pixel;
+          color_table[t].found =  1;
+
+          p++;
+
+          break;
+        }
+        else if ((color_table[t].pixel) == pixel)
+        {
+          break;
+        }
+      }
+
+      if (p == nb_max)
+      {
+        return nb_max + 1;
+      }
+    }
+  }
+
+  return p;
+}
+
+void NXMaskImage(XImage *image, unsigned int method)
+{
+  unsigned int maskMethod;
+
+  const ColorMask *mask;
+
+  /*
+   * Choose the correct mask method
+   */
+
+  switch(method)
+  {
+    case PACK_JPEG_8_COLORS:
+    case PACK_PNG_8_COLORS:
+    {
+      maskMethod = MASK_8_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_8_COLORS\n");
+      #endif
+
+      break;
+    }
+    case PACK_JPEG_64_COLORS:
+    case PACK_PNG_64_COLORS:
+    {
+      maskMethod = MASK_64_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_64K_COLORS\n");
+      #endif
+
+      break;
+    }
+    case PACK_JPEG_256_COLORS:
+    case PACK_PNG_256_COLORS:
+    {
+      maskMethod = MASK_256_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_256_COLORS\n");
+      #endif
+
+      break;
+    }
+    case PACK_JPEG_512_COLORS:
+    case PACK_PNG_512_COLORS:
+    {
+      maskMethod = MASK_512_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_512K_COLORS\n");
+      #endif
+
+      break;
+    }
+    case PACK_JPEG_4K_COLORS:
+    case PACK_PNG_4K_COLORS:
+    {
+      maskMethod = MASK_4K_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_4K_COLORS\n");
+      #endif
+
+      break;
+    }
+    case PACK_JPEG_32K_COLORS:
+    case PACK_PNG_32K_COLORS:
+    {
+      maskMethod = MASK_32K_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_32K_COLORS\n");
+      #endif
+
+      break;
+    }
+    case PACK_JPEG_64K_COLORS:
+    case PACK_PNG_64K_COLORS:
+    {
+      maskMethod = MASK_64K_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_64K_COLORS\n");
+      #endif
+
+      break;
+    }
+    case PACK_JPEG_256K_COLORS:
+    case PACK_PNG_256K_COLORS:
+    {
+      maskMethod = MASK_256K_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_256K_COLORS\n");
+      #endif
+
+      break;
+    }
+    case PACK_JPEG_2M_COLORS:
+    case PACK_PNG_2M_COLORS:
+    {
+      maskMethod = MASK_2M_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_2M_COLORS\n");
+      #endif
+
+      break;
+    }
+    case PACK_JPEG_16M_COLORS:
+    case PACK_PNG_16M_COLORS:
+    {
+      maskMethod = MASK_16M_COLORS;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXMaskImage: Method is MASK_16M_COLORS\n");
+      #endif
+
+      break;
+    }
+    default:
+    {
+      #ifdef PANIC
+      fprintf(stderr, "******NXMaskImage: PANIC! Cannot find mask method for pack method [%d]\n",
+                  method);
+      #endif
+
+      return;
+    }
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******NXMaskImage: packMethod[%d] => maskMethod[%d]\n",
+              method, maskMethod);
+  #endif
+
+  /*
+   * Get mask out of method and check if
+   * visual is supported by current color
+   * reduction algorithm.
+   */
+
+  mask = MethodColorMask(maskMethod);
+
+  if (mask == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXMaskImage: PANIC! No mask to apply for pack method [%d].\n",
+                method);
+    #endif
+
+    return;
+  }
+  else if (CanMaskImage(image, mask) == 0)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXMaskImage: PANIC! Invalid source with format [%d] depth [%d] bits per pixel [%d].\n",
+                image -> format, image -> depth, image -> bits_per_pixel);
+
+    fprintf(stderr, "******NXMaskImage: PANIC! Visual colormask is red 0x%lx green 0x%lx blue 0x%lx.\n",
+                image -> red_mask, image -> green_mask, image -> blue_mask);
+    #endif
+
+    return;
+  }
+
+  /*
+   * Calling ShouldMaskImage you get 0 in the case
+   * of MASK_256_COLORS and MASK_64K_COLORS, which
+   * means that the image should not be masked.
+   */
+
+  if (ShouldMaskImage(image, mask) == 0)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******NXMaskImage: the image will not be masked\n");
+    #endif
+  }
+  else
+  {
+    if (MaskInPlaceImage(mask, image) <= 0)
+    {
+      #ifdef PANIC
+      fprintf(stderr, "******NXMaskImage: PANIC! Failed to apply the color mask in place.\n");
+      #endif
+    }
+  }
+}
+
+/*
+ * The display parameter is ignored.
+ */
+
+void NXInitCache(Display *dpy, int entries)
+{
+  if (NXImageCache != NULL && NXImageCacheSize == entries)
+  {
+    #ifdef DEBUG
+    fprintf(stderr, "******NXInitCache: Nothing to do with image cache at [%p] and [%d] entries.\n",
+                NXImageCache,  NXImageCacheSize);
+    #endif
+
+    return;
+  }
+
+  #ifdef DEBUG
+  fprintf(stderr, "******NXInitCache: Initializing the cache with [%d] entries.\n",
+              entries);
+  #endif
+
+  NXImageCacheSize = 0;
+
+  if (NXImageCache != NULL)
+  {
+    Xfree(NXImageCache);
+
+    NXImageCache = NULL;
+  }
+
+  if (entries > 0)
+  {
+    NXImageCache = Xmalloc(entries * sizeof(_NXImageCacheEntry));
+
+    if (NXImageCache != NULL)
+    {
+      memset(NXImageCache, 0, entries * sizeof(_NXImageCacheEntry));
+
+      NXImageCacheSize = entries;
+
+      #ifdef DEBUG
+      fprintf(stderr, "******NXInitCache: Image cache initialized with [%d] entries.\n", entries);
+      #endif
+    }
+  }
+}
+
+#ifdef DUMP
+
+void _NXCacheDump(const char *label)
+{
+  char s[MD5_LENGTH * 2 + 1];
+
+  int i;
+  int j;
+
+  #ifdef DEBUG
+  fprintf(stderr, "%s: Dumping the content of image cache:\n", label);
+  #endif
+
+  for (i = 0; i < NXImageCacheSize; i++)
+  {
+    if (NXImageCache[i].image == NULL)
+    {
+      break;
+    }
+
+    for (j = 0; j < MD5_LENGTH; j++)
+    {
+      sprintf(s + (j * 2), "%02X", ((unsigned char *) NXImageCache[i].md5)[j]);
+    }
+
+    #ifdef DEBUG
+    fprintf(stderr, "%s: [%d][%s].\n", label, i, s);
+    #endif
+  }
+}
+
+#endif
+
+XImage *NXCacheFindImage(NXPackedImage *src_image, unsigned int *method, unsigned char **md5)
+{
+  md5_state_t  new_state;
+  md5_byte_t   *new_md5;
+  unsigned int data_size, i;
+
+  if (NXImageCache == NULL)
+  {
+    return NULL;
+  }
+
+  /*
+   * Will return the allocated checksum
+   * if the image is not found.
+   */
+
+  *md5 = NULL;
+
+  if ((new_md5 = Xmalloc(MD5_LENGTH)) == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCacheFindImage: Can't allocate memory for the checksum.\n");
+    #endif
+
+    return NULL;
+  }
+
+  data_size = (src_image -> bytes_per_line * src_image -> height);
+
+  md5_init(&new_state);
+
+  md5_append(&new_state, (unsigned char *) &src_image -> width,  sizeof(int));
+  md5_append(&new_state, (unsigned char *) &src_image -> height, sizeof(int));
+
+  md5_append(&new_state, (unsigned char *) src_image -> data, data_size);
+
+  md5_finish(&new_state, new_md5);
+
+  for (i = 0; i < NXImageCacheSize; i++)
+  {
+    if (NXImageCache[i].image != NULL)
+    {
+      if (memcmp(NXImageCache[i].md5, new_md5, MD5_LENGTH) == 0)
+      {
+        _NXImageCacheEntry found;
+
+        found.image  = NXImageCache[i].image;
+        found.method = NXImageCache[i].method;
+        found.md5    = NXImageCache[i].md5;
+
+        *method = found.method;
+
+        NXImageCacheHits++;
+
+        #ifdef DEBUG
+        fprintf(stderr, "******NXCacheFindImage: Found at position [%d] with hits [%d] and [%d] packs.\n",
+                    i, NXImageCacheHits, NXImageCacheOps);
+        #endif
+
+        Xfree(new_md5);
+
+        /*
+         * Move the images down one slot, from
+         * the head of the list, and place the
+         * image just found at top.
+         */
+
+        if (i > 16)
+        {
+          #ifdef DEBUG
+          fprintf(stderr, "******NXCacheFindImage: Moving the image at the head of the list.\n");
+          #endif
+
+          memmove(&NXImageCache[1], &NXImageCache[0], (i * sizeof(_NXImageCacheEntry)));
+
+          NXImageCache[0].image  = found.image;
+          NXImageCache[0].method = found.method;
+          NXImageCache[0].md5    = found.md5;
+
+          #ifdef DUMP
+
+          _NXCacheDump("******NXCacheFindImage");
+
+          #endif
+        }
+
+        /*
+         * Return the checksum and image
+         * structure allocated in cache.
+         */
+
+        *md5 = found.md5;
+
+        return found.image;
+      }
+    }
+    else
+    {
+      break;
+    }
+  }
+
+  *md5 = new_md5;
+
+  return NULL;
+}
+
+/*
+ * Add a packed image to the cache. A new image
+ * structure is allocated and copied, data and
+ * checksum are inherited from the passed image.
+ */
+
+int NXCacheAddImage(NXPackedImage *image, unsigned int method, unsigned char *md5)
+{
+  unsigned int i;
+
+  if (image == NULL || image -> data == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCacheAddImage: PANIC! Invalid image passed to function.\n");
+    #endif
+
+    return -1;
+  }
+
+  i = (NXImageCacheOps < NXImageCacheSize) ? NXImageCacheOps : NXImageCacheSize;
+
+  if (NXImageCacheOps >= NXImageCacheSize)
+  {
+    #ifdef DEBUG
+    fprintf(stderr, "******NXCacheAddImage: Freeing up the oldest entry.\n");
+    #endif
+
+    i--;
+
+    Xfree(NXImageCache[NXImageCacheSize - 1].image -> data);
+    Xfree(NXImageCache[NXImageCacheSize - 1].image);
+    Xfree(NXImageCache[NXImageCacheSize - 1].md5);
+  }
+
+  if (i > 0)
+  {
+    memmove(&NXImageCache[1], &NXImageCache[0], i * sizeof(_NXImageCacheEntry));
+  }
+
+  NXImageCacheOps++;
+
+  #ifdef DEBUG
+  fprintf(stderr, "******NXCacheAddImage: Going to add new image with data size [%d].\n",
+              image -> xoffset);
+  #endif
+
+  NXImageCache[0].image  = image;
+  NXImageCache[0].method = method;
+  NXImageCache[0].md5    = md5;
+
+  #ifdef DUMP
+
+  _NXCacheDump("******NXCacheAddImage");
+
+  #endif
+
+  return 1;
+}
+
+/*
+ * The display parameter is ignored.
+ */
+
+void NXFreeCache(Display *dpy)
+{
+  int i;
+
+  if (NXImageCache == NULL)
+  {
+    #ifdef DEBUG
+    fprintf(stderr, "******NXFreeCache: Nothing to do with a null image cache.\n");
+    #endif
+
+    return;
+  }
+
+  #ifdef DEBUG
+  fprintf(stderr, "******NXFreeCache: Freeing the cache with [%d] entries.\n",
+              NXImageCacheSize);
+  #endif
+
+  for (i = 0; i < NXImageCacheSize; i++)
+  {
+    if (NXImageCache[i].image != NULL)
+    {
+      if (NXImageCache[i].image -> data != NULL)
+      {
+        Xfree(NXImageCache[i].image -> data);
+      }
+
+      Xfree(NXImageCache[i].image);
+
+      NXImageCache[i].image = NULL;
+    }
+
+    if (NXImageCache[i].md5 != NULL)
+    {
+      Xfree(NXImageCache[i].md5);
+
+      NXImageCache[i].md5 = NULL;
+    }
+  }
+
+  Xfree(NXImageCache);
+
+  NXImageCache = NULL;
+
+  NXImageCacheSize = 0;
+  NXImageCacheHits = 0;
+  NXImageCacheOps  = 0;
+}
+
+static void _NXNotifyImage(Display *dpy, int resource, Bool success)
+{
+  XEvent async_event;
+
+  /*
+   * Enqueue an event to tell client
+   * the result of GetImage.
+   */
+
+  async_event.type = ClientMessage;
+
+  async_event.xclient.window       = 0;
+  async_event.xclient.message_type = 0;
+  async_event.xclient.format       = 32;
+
+  async_event.xclient.data.l[0] = NXCollectImageNotify;
+  async_event.xclient.data.l[1] = resource;
+  async_event.xclient.data.l[2] = success;
+
+  XPutBackEvent(dpy, &async_event);
+}
+
+static Bool _NXCollectImageHandler(Display *dpy, xReply *rep, char *buf,
+                                       int len, XPointer data)
+{
+  register _NXCollectImageState *state;
+
+  register xGetImageReply *async_rep;
+
+  char *async_head;
+  char *async_data;
+
+  int async_size;
+
+  state = (_NXCollectImageState *) data;
+
+  if ((rep -> generic.sequenceNumber % 65536) !=
+          ((int)(state -> sequence) % 65536))
+  {
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectImageHandler: Unmatched sequence [%d] for opcode [%d] "
+                "with length [%d].\n", rep -> generic.sequenceNumber, rep -> generic.type,
+                    (int) rep -> generic.length << 2);
+    #endif
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectImageHandler: Going to handle asynchronous GetImage reply.\n");
+  #endif
+
+  /*
+   * As even reply data is managed asynchronously,
+   * we can use state to get to vector and vector
+   * to get to handler. In this way, we can safely
+   * dequeue and free the handler itself.
+   */
+
+  DeqAsyncHandler(dpy, state -> handler);
+
+  Xfree(state -> handler);
+
+  state -> handler = NULL;
+
+  if (rep -> generic.type == X_Error)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectImageHandler: Error received from X server for resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyImage(dpy, state -> resource, False);
+
+    _NXCollectedImages[state -> resource] = NULL;
+
+    Xfree(state);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectImageHandler: Matched request with sequence [%ld].\n",
+              state -> sequence);
+  #endif
+
+  async_size = SIZEOF(xGetImageReply);
+
+  async_head = Xmalloc(async_size);
+
+  if (async_head == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******_NXCollectImageHandler: PANIC! Failed to allocate memory with resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyImage(dpy, state -> resource, False);
+
+    _NXCollectedImages[state -> resource] = NULL;
+
+    Xfree(state);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectImageHandler: Going to get reply with size [%d].\n",
+              (int) rep -> generic.length << 2);
+  #endif
+
+  async_rep = (xGetImageReply *) _XGetAsyncReply(dpy, async_head, rep, buf, len, 0, False);
+
+  if (async_rep == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******_NXCollectImageHandler: PANIC! Failed to get reply with resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyImage(dpy, state -> resource, False);
+
+    _NXCollectedImages[state -> resource] = NULL;
+
+    Xfree(state);
+
+    Xfree(async_head);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectImageHandler: Got reply with depth [%d] visual [%d] size [%d].\n",
+              async_rep -> depth, (int) async_rep -> visual, (int) async_rep -> length << 2);
+  #endif
+
+  async_size = async_rep -> length << 2;
+
+  if (async_size > 0)
+  {
+    async_data = Xmalloc(async_size);
+
+    if (async_data == NULL)
+    {
+      #ifdef PANIC
+      fprintf(stderr, "******_NXCollectImageHandler: PANIC! Failed to allocate memory with resource [%d].\n",
+                  state -> resource);
+      #endif
+
+      _NXNotifyImage(dpy, state -> resource, False);
+
+      _NXCollectedImages[state -> resource] = NULL;
+
+      Xfree(state);
+
+      Xfree(async_head);
+
+      return False;
+    }
+
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectImageHandler: Going to get data with size [%d].\n",
+                async_size);
+    #endif
+
+    _XGetAsyncData(dpy, async_data, buf, len, SIZEOF(xGetImageReply), async_size, async_size);
+
+    /*
+     * From now on we can return True, as all
+     * data has been consumed from buffer.
+     */
+
+    if (state -> format == XYPixmap)
+    {
+      unsigned long depth = DepthOnes(state -> mask & (((unsigned long)0xFFFFFFFF) >>
+                                          (32 - async_rep -> depth)));
+
+      state -> image = XCreateImage(dpy, _XVIDtoVisual(dpy, async_rep -> visual),
+                                        depth, XYPixmap, 0, async_data, state -> width,
+                                            state -> height, dpy -> bitmap_pad, 0);
+    }
+    else
+    {
+      state -> image = XCreateImage(dpy, _XVIDtoVisual(dpy, async_rep -> visual),
+                                        async_rep -> depth, ZPixmap, 0, async_data, state -> width,
+                                            state -> height, _XGetScanlinePad(dpy, async_rep -> depth), 0);
+    }
+
+    if (state -> image == NULL)
+    {
+      #ifdef PANIC
+      fprintf(stderr, "******_NXCollectImageHandler: PANIC! Failed to create image for resource [%d].\n",
+                  state -> resource);
+      #endif
+
+      _NXNotifyImage(dpy, state -> resource, False);
+
+      _NXCollectedImages[state -> resource] = NULL;
+
+      Xfree(state);
+
+      Xfree(async_head);
+      Xfree(async_data);
+
+      return True;
+    }
+
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectImageHandler: Successfully stored image data for resource [%d].\n",
+                state -> resource);
+    #endif
+  }
+  #ifdef WARNING
+  else
+  {
+    fprintf(stderr, "******_NXCollectImageHandler: WARNING! Null image data stored for resource [%d].\n",
+                state -> resource);
+  }
+  #endif
+
+  _NXNotifyImage(dpy, state -> resource, True);
+
+  Xfree(async_head);
+
+  return True;
+}
+
+int NXGetCollectImageResource(Display *dpy)
+{
+  int i;
+
+  for (i = 0; i < NXNumberOfResources; i++)
+  {
+    if (_NXCollectedImages[i] == NULL)
+    {
+      return i;
+    }
+  }
+
+  return -1;
+}
+
+int NXCollectImage(Display *dpy, unsigned int resource, Drawable drawable,
+                       int src_x, int src_y, unsigned int width, unsigned int height,
+                           unsigned long plane_mask, int format)
+{
+  register xGetImageReq *req;
+
+  _NXCollectImageState *state;
+  _XAsyncHandler *handler;
+
+  if (resource >= NXNumberOfResources)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectImage: PANIC! Provided resource [%u] is out of range.\n",
+                resource);
+    #endif
+
+    return -1;
+  }
+
+  state = _NXCollectedImages[resource];
+
+  if (state != NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectImage: PANIC! Having to remove previous state for resource [%u].\n",
+                resource);
+    #endif
+
+    if (state -> handler != NULL)
+    {
+      DeqAsyncHandler(dpy, state -> handler);
+
+      Xfree(state -> handler);
+    }
+
+    if (state -> image != NULL)
+    {
+      XDestroyImage(state -> image);
+    }
+
+    Xfree(state);
+
+    _NXCollectedImages[resource] = NULL;
+  }
+
+  LockDisplay(dpy);
+
+  GetReq(GetImage, req);
+
+  req -> format    = format;
+  req -> drawable  = drawable;
+  req -> x         = src_x;
+  req -> y         = src_y;
+  req -> width     = width;
+  req -> height    = height;
+  req -> planeMask = plane_mask;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXCollectImage: Sending message opcode [%d] sequence [%ld] for resource [%d].\n",
+              X_GetImage, dpy -> request, resource);
+
+  fprintf(stderr, "******NXCollectImage: Format [%d] drawable [%d] src_x [%d] src_y [%d].\n",
+              req -> format, (int) req -> drawable, req -> x, req -> y);
+
+  fprintf(stderr, "******NXCollectImage: Width [%d] height [%d] plane_mask [%x].\n",
+              req -> width, req -> height, (int) req -> planeMask);
+  #endif
+
+  state   = Xmalloc(sizeof(_NXCollectImageState));
+  handler = Xmalloc(sizeof(_XAsyncHandler));
+
+  if (state == NULL || handler == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectImage: PANIC! Failed to allocate memory with resource [%d].\n",
+                resource);
+    #endif
+
+    UnGetReq(GetImage);
+
+    if (state != NULL)
+    {
+      Xfree(state);
+    }
+
+    if (handler != NULL)
+    {
+      Xfree(handler);
+    }
+
+    UnlockDisplay(dpy);
+
+    return -1;
+  }
+
+  state -> sequence = dpy -> request;
+  state -> resource = resource;
+  state -> mask     = plane_mask;
+  state -> format   = format;
+  state -> width    = width;
+  state -> height   = height;
+  state -> image    = NULL;
+
+  state -> handler = handler;
+
+  handler -> next = dpy -> async_handlers;
+  handler -> handler = _NXCollectImageHandler;
+  handler -> data = (XPointer) state;
+  dpy -> async_handlers = handler;
+
+  _NXCollectedImages[resource] = state;
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return 1;
+}
+
+int NXGetCollectedImage(Display *dpy, unsigned int resource, XImage **image)
+{
+  register _NXCollectImageState *state;
+
+  state = _NXCollectedImages[resource];
+
+  if (state == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXGetCollectedImage: PANIC! No image collected for resource [%u].\n",
+                resource);
+    #endif
+
+    return 0;
+  }
+
+  _NXCollectedImages[resource] = NULL;
+
+  *image = state -> image;
+
+  Xfree(state);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetCollectedImage: Returning GetImage data for resource [%u].\n",
+              resource);
+  #endif
+
+  return 1;
+}
+
+static void _NXNotifyProperty(Display *dpy, int resource, Bool success)
+{
+  XEvent async_event;
+
+  /*
+   * Enqueue an event to tell client
+   * the result of GetProperty.
+   */
+
+  async_event.type = ClientMessage;
+
+  async_event.xclient.window       = 0;
+  async_event.xclient.message_type = 0;
+  async_event.xclient.format       = 32;
+
+  async_event.xclient.data.l[0] = NXCollectPropertyNotify;
+  async_event.xclient.data.l[1] = resource;
+  async_event.xclient.data.l[2] = success;
+
+  XPutBackEvent(dpy, &async_event);
+}
+
+static Bool _NXCollectPropertyHandler(Display *dpy, xReply *rep, char *buf,
+                                          int len, XPointer data)
+{
+  register _NXCollectPropertyState *state;
+
+  register xGetPropertyReply *async_rep;
+
+  char *async_head;
+  char *async_data;
+
+  int async_size;
+
+  state = (_NXCollectPropertyState *) data;
+
+  if ((rep -> generic.sequenceNumber % 65536) !=
+          ((int)(state -> sequence) % 65536))
+  {
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectPropertyHandler: Unmatched sequence [%d] for opcode [%d] "
+                "with length [%d].\n", rep -> generic.sequenceNumber, rep -> generic.type,
+                    (int) rep -> generic.length << 2);
+    #endif
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectPropertyHandler: Going to handle asynchronous GetProperty reply.\n");
+  #endif
+
+  /*
+   * Reply data is managed asynchronously. We can
+   * use state to get to vector and vector to get
+   * to handler. In this way, we can dequeue and
+   * free the handler itself.
+   */
+
+  DeqAsyncHandler(dpy, state -> handler);
+
+  Xfree(state -> handler);
+
+  state -> handler = NULL;
+
+  if (rep -> generic.type == X_Error)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectPropertyHandler: Error received from X server for resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyProperty(dpy, state -> resource, False);
+
+    _NXCollectedProperties[state -> resource] = NULL;
+
+    Xfree(state);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectPropertyHandler: Matched request with sequence [%ld].\n",
+              state -> sequence);
+  #endif
+
+  async_size = SIZEOF(xGetPropertyReply);
+
+  async_head = Xmalloc(async_size);
+
+  if (async_head == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******_NXCollectPropertyHandler: PANIC! Failed to allocate memory with resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyProperty(dpy, state -> resource, False);
+
+    _NXCollectedProperties[state -> resource] = NULL;
+
+    Xfree(state);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectPropertyHandler: Going to get reply with size [%d].\n",
+              (int) rep -> generic.length << 2);
+  #endif
+
+  async_rep = (xGetPropertyReply *) _XGetAsyncReply(dpy, async_head, rep, buf, len, 0, False);
+
+  if (async_rep == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******_NXCollectPropertyHandler: PANIC! Failed to get reply with resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyProperty(dpy, state -> resource, False);
+
+    _NXCollectedProperties[state -> resource] = NULL;
+
+    Xfree(state);
+
+    Xfree(async_head);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectPropertyHandler: Got reply with format [%d] type [%d] size [%d].\n",
+              async_rep -> format, (int) async_rep -> propertyType, (int) async_rep -> length << 2);
+
+  fprintf(stderr, "******_NXCollectPropertyHandler: Bytes after [%d] number of items [%d].\n",
+              (int) async_rep -> bytesAfter, (int) async_rep -> nItems);
+  #endif
+
+  state -> format = async_rep -> format;
+  state -> type   = async_rep -> propertyType;
+  state -> items  = async_rep -> nItems;
+  state -> after  = async_rep -> bytesAfter;
+
+  async_size = async_rep -> length << 2;
+
+  if (async_size > 0)
+  {
+    async_data = Xmalloc(async_size);
+
+    if (async_data == NULL)
+    {
+      #ifdef PANIC
+      fprintf(stderr, "******_NXCollectPropertyHandler: PANIC! Failed to allocate memory with resource [%d].\n",
+                  state -> resource);
+      #endif
+
+      _NXNotifyProperty(dpy, state -> resource, False);
+
+      _NXCollectedProperties[state -> resource] = NULL;
+
+      Xfree(state);
+
+      Xfree(async_head);
+
+      return False;
+    }
+
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectPropertyHandler: Going to get data with size [%d].\n",
+                async_size);
+    #endif
+
+    _XGetAsyncData(dpy, async_data, buf, len, SIZEOF(xGetPropertyReply), async_size, async_size);
+
+    /*
+     * From now on we can return True, as all
+     * data has been consumed from buffer.
+     */
+
+    state -> data = async_data;
+
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectPropertyHandler: Successfully stored property data for resource [%d].\n",
+                state -> resource);
+    #endif
+  }
+  #ifdef TEST
+  else
+  {
+    fprintf(stderr, "******_NXCollectPropertyHandler: WARNING! Null property data stored for resource [%d].\n",
+                state -> resource);
+  }
+  #endif
+
+  _NXNotifyProperty(dpy, state -> resource, True);
+
+  Xfree(async_head);
+
+  return True;
+}
+
+int NXGetCollectPropertyResource(Display *dpy)
+{
+  int i;
+
+  for (i = 0; i < NXNumberOfResources; i++)
+  {
+    if (_NXCollectedProperties[i] == NULL)
+    {
+      return i;
+    }
+  }
+
+  return -1;
+}
+
+int NXCollectProperty(Display *dpy, unsigned int resource, Window window, Atom property,
+                          long long_offset, long long_length, Bool delete, Atom req_type)
+{
+  register xGetPropertyReq *req;
+
+  _NXCollectPropertyState *state;
+  _XAsyncHandler *handler;
+
+  if (resource >= NXNumberOfResources)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectProperty: PANIC! Provided resource [%u] is out of range.\n",
+                resource);
+    #endif
+
+    return -1;
+  }
+
+  state = _NXCollectedProperties[resource];
+
+  if (state != NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectProperty: PANIC! Having to remove previous state for resource [%u].\n",
+                resource);
+    #endif
+
+    if (state -> handler != NULL)
+    {
+      DeqAsyncHandler(dpy, state -> handler);
+
+      Xfree(state -> handler);
+    }
+
+    if (state -> data != NULL)
+    {
+      Xfree(state -> data);
+    }
+
+    Xfree(state);
+
+    _NXCollectedProperties[resource] = NULL;
+  }
+
+  LockDisplay(dpy);
+
+  GetReq(GetProperty, req);
+
+  req -> delete     = delete;
+  req -> window     = window;
+  req -> property   = property;
+  req -> type       = req_type;
+  req -> longOffset = long_offset;
+  req -> longLength = long_length;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXCollectProperty: Sending message opcode [%d] sequence [%ld] for resource [%d].\n",
+              X_GetProperty, dpy -> request, resource);
+
+  fprintf(stderr, "******NXCollectProperty: Delete [%u] window [%d] property [%d] type [%d].\n",
+              req -> delete, (int) req -> window, (int) req -> property, (int) req -> type);
+
+  fprintf(stderr, "******NXCollectProperty: Long offset [%d] long length [%d].\n",
+              (int) req -> longOffset, (int) req -> longLength);
+  #endif
+
+  state   = Xmalloc(sizeof(_NXCollectPropertyState));
+  handler = Xmalloc(sizeof(_XAsyncHandler));
+
+  if (state == NULL || handler == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectProperty: Failed to allocate memory with resource [%d].\n",
+                resource);
+    #endif
+
+    if (state != NULL)
+    {
+      Xfree(state);
+    }
+
+    if (handler != NULL)
+    {
+      Xfree(handler);
+    }
+
+    UnGetReq(GetProperty);
+
+    UnlockDisplay(dpy);
+
+    return -1;
+  }
+
+  state -> sequence = dpy -> request;
+  state -> resource = resource;
+  state -> window   = window;
+  state -> property = property;
+  state -> type     = 0;
+  state -> format   = 0;
+  state -> items    = 0;
+  state -> after    = 0;
+  state -> data     = NULL;
+
+  state -> handler = handler;
+
+  handler -> next = dpy -> async_handlers;
+  handler -> handler = _NXCollectPropertyHandler;
+  handler -> data = (XPointer) state;
+  dpy -> async_handlers = handler;
+
+  _NXCollectedProperties[resource] = state;
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return True;
+}
+
+int NXGetCollectedProperty(Display *dpy, unsigned int resource, Atom *actual_type_return,
+                               int *actual_format_return, unsigned long *nitems_return,
+                                   unsigned long *bytes_after_return, unsigned char **data)
+{
+  register _NXCollectPropertyState *state;
+
+  state = _NXCollectedProperties[resource];
+
+  if (state == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXGetCollectedProperty: PANIC! No data collected for resource [%u].\n",
+                resource);
+    #endif
+
+    return 0;
+  }
+
+  *actual_type_return   = state -> type;
+  *actual_format_return = state -> format;
+  *nitems_return        = state -> items;
+  *bytes_after_return   = state -> after;
+
+  *data = (unsigned char *) _NXCollectedProperties[resource] -> data;
+
+  Xfree(state);
+
+  _NXCollectedProperties[resource] = NULL;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetCollectedProperty: Returning GetProperty data for resource [%u].\n",
+              resource);
+  #endif
+
+  return True;
+}
+
+static void _NXNotifyGrabPointer(Display *dpy, int resource, Bool success)
+{
+  XEvent async_event;
+
+  async_event.type = ClientMessage;
+
+  async_event.xclient.window       = 0;
+  async_event.xclient.message_type = 0;
+  async_event.xclient.format       = 32;
+
+  async_event.xclient.data.l[0] = NXCollectGrabPointerNotify;
+  async_event.xclient.data.l[1] = resource;
+  async_event.xclient.data.l[2] = success;
+
+  XPutBackEvent(dpy, &async_event);
+}
+
+static Bool _NXCollectGrabPointerHandler(Display *dpy, xReply *rep, char *buf,
+                                             int len, XPointer data)
+{
+  register _NXCollectGrabPointerState *state;
+
+  register xGrabPointerReply *async_rep;
+
+  char *async_head;
+
+  int async_size;
+
+  state = (_NXCollectGrabPointerState *) data;
+
+  if ((rep -> generic.sequenceNumber % 65536) !=
+          ((int)(state -> sequence) % 65536))
+  {
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectGrabPointerHandler: Unmatched sequence [%d] for opcode [%d] "
+                "with length [%d].\n", rep -> generic.sequenceNumber, rep -> generic.type,
+                    (int) rep -> generic.length << 2);
+    #endif
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectGrabPointerHandler: Going to handle asynchronous GrabPointer reply.\n");
+  #endif
+
+  DeqAsyncHandler(dpy, state -> handler);
+
+  Xfree(state -> handler);
+
+  state -> handler = NULL;
+
+  if (rep -> generic.type == X_Error)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectGrabPointerHandler: Error received from X server for resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyGrabPointer(dpy, state -> resource, False);
+
+    _NXCollectedGrabPointers[state -> resource] = NULL;
+
+    Xfree(state);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectGrabPointerHandler: Matched request with sequence [%ld].\n",
+              state -> sequence);
+  #endif
+
+  async_size = SIZEOF(xGrabPointerReply);
+
+  async_head = Xmalloc(async_size);
+
+  if (async_head == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******_NXCollectGrabPointerHandler: PANIC! Failed to allocate memory with resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyGrabPointer(dpy, state -> resource, False);
+
+    _NXCollectedGrabPointers[state -> resource] = NULL;
+
+    Xfree(state);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectGrabPointerHandler: Going to get reply with size [%d].\n",
+              (int) rep -> generic.length << 2);
+  #endif
+
+  async_rep = (xGrabPointerReply *) _XGetAsyncReply(dpy, async_head, rep, buf, len, 0, False);
+
+  if (async_rep == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******_NXCollectGrabPointerHandler: PANIC! Failed to get reply with resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyGrabPointer(dpy, state -> resource, False);
+
+    _NXCollectedGrabPointers[state -> resource] = NULL;
+
+    Xfree(state);
+
+    Xfree(async_head);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectGrabPointerHandler: Got reply with status [%d] size [%d].\n",
+              async_rep -> status, (int) async_rep -> length << 2);
+  #endif
+
+  state -> status = async_rep -> status;
+
+  _NXNotifyGrabPointer(dpy, state -> resource, True);
+
+  Xfree(async_head);
+
+  return True;
+}
+
+int NXGetCollectGrabPointerResource(Display *dpy)
+{
+  int i;
+
+  for (i = 0; i < NXNumberOfResources; i++)
+  {
+    if (_NXCollectedGrabPointers[i] == NULL)
+    {
+      return i;
+    }
+  }
+
+  return -1;
+}
+
+int NXCollectGrabPointer(Display *dpy, unsigned int resource, Window grab_window, Bool owner_events,
+                             unsigned int event_mask, int pointer_mode, int keyboard_mode,
+                                 Window confine_to, Cursor cursor, Time time)
+{
+  register xGrabPointerReq *req;
+
+  _NXCollectGrabPointerState *state;
+  _XAsyncHandler *handler;
+
+  if (resource >= NXNumberOfResources)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectGrabPointer: PANIC! Provided resource [%u] is out of range.\n",
+                resource);
+    #endif
+
+    return -1;
+  }
+
+  state = _NXCollectedGrabPointers[resource];
+
+  if (state != NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectGrabPointer: PANIC! Having to remove previous state for resource [%u].\n",
+                resource);
+    #endif
+
+    if (state -> handler != NULL)
+    {
+      DeqAsyncHandler(dpy, state -> handler);
+
+      Xfree(state -> handler);
+    }
+
+    Xfree(state);
+
+    _NXCollectedGrabPointers[resource] = NULL;
+  }
+
+  LockDisplay(dpy);
+
+  GetReq(GrabPointer, req);
+
+  req -> grabWindow   = grab_window;
+  req -> ownerEvents  = owner_events;
+  req -> eventMask    = event_mask;
+  req -> pointerMode  = pointer_mode;
+  req -> keyboardMode = keyboard_mode;
+  req -> confineTo    = confine_to;
+  req -> cursor       = cursor;
+  req -> time         = time;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXCollectGrabPointer: Sending message opcode [%d] sequence [%ld] "
+              "for resource [%d].\n", X_GrabPointer, dpy -> request, resource);
+  #endif
+
+  state   = Xmalloc(sizeof(_NXCollectGrabPointerState));
+  handler = Xmalloc(sizeof(_XAsyncHandler));
+
+  if (state == NULL || handler == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectGrabPointer: Failed to allocate memory with resource [%d].\n",
+                resource);
+    #endif
+
+    if (state != NULL)
+    {
+      Xfree(state);
+    }
+
+    if (handler != NULL)
+    {
+      Xfree(handler);
+    }
+
+    UnGetReq(GrabPointer);
+
+    UnlockDisplay(dpy);
+
+    return -1;
+  }
+
+  state -> sequence = dpy -> request;
+  state -> resource = resource;
+  state -> status   = 0;
+
+  state -> handler = handler;
+
+  handler -> next = dpy -> async_handlers;
+  handler -> handler = _NXCollectGrabPointerHandler;
+  handler -> data = (XPointer) state;
+  dpy -> async_handlers = handler;
+
+  _NXCollectedGrabPointers[resource] = state;
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return True;
+}
+
+int NXGetCollectedGrabPointer(Display *dpy, unsigned int resource, int *status)
+{
+  register _NXCollectGrabPointerState *state;
+
+  state = _NXCollectedGrabPointers[resource];
+
+  if (state == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXGetCollectedGrabPointer: PANIC! No data collected for resource [%u].\n",
+                resource);
+    #endif
+
+    return 0;
+  }
+
+  *status = state -> status;
+
+  Xfree(state);
+
+  _NXCollectedGrabPointers[resource] = NULL;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetCollectedGrabPointer: Returning GrabPointer data for resource [%u].\n",
+              resource);
+  #endif
+
+  return True;
+}
+
+static void _NXNotifyInputFocus(Display *dpy, int resource, Bool success)
+{
+  XEvent async_event;
+
+  async_event.type = ClientMessage;
+
+  async_event.xclient.window       = 0;
+  async_event.xclient.message_type = 0;
+  async_event.xclient.format       = 32;
+
+  async_event.xclient.data.l[0] = NXCollectInputFocusNotify;
+  async_event.xclient.data.l[1] = resource;
+  async_event.xclient.data.l[2] = success;
+
+  XPutBackEvent(dpy, &async_event);
+}
+
+static Bool _NXCollectInputFocusHandler(Display *dpy, xReply *rep, char *buf,
+                                            int len, XPointer data)
+{
+  register _NXCollectInputFocusState *state;
+
+  register xGetInputFocusReply *async_rep;
+
+  char *async_head;
+
+  int async_size;
+
+  state = (_NXCollectInputFocusState *) data;
+
+  if ((rep -> generic.sequenceNumber % 65536) !=
+          ((int)(state -> sequence) % 65536))
+  {
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectInputFocusHandler: Unmatched sequence [%d] for opcode [%d] "
+                "with length [%d].\n", rep -> generic.sequenceNumber, rep -> generic.type,
+                    (int) rep -> generic.length << 2);
+    #endif
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectInputFocusHandler: Going to handle asynchronous GetInputFocus reply.\n");
+  #endif
+
+  DeqAsyncHandler(dpy, state -> handler);
+
+  Xfree(state -> handler);
+
+  state -> handler = NULL;
+
+  if (rep -> generic.type == X_Error)
+  {
+    #ifdef TEST
+    fprintf(stderr, "******_NXCollectInputFocusHandler: Error received from X server for resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyInputFocus(dpy, state -> resource, False);
+
+    _NXCollectedInputFocuses[state -> resource] = NULL;
+
+    Xfree(state);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectInputFocusHandler: Matched request with sequence [%ld].\n",
+              state -> sequence);
+  #endif
+
+  async_size = SIZEOF(xGetInputFocusReply);
+
+  async_head = Xmalloc(async_size);
+
+  if (async_head == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******_NXCollectInputFocusHandler: PANIC! Failed to allocate memory with resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyInputFocus(dpy, state -> resource, False);
+
+    _NXCollectedInputFocuses[state -> resource] = NULL;
+
+    Xfree(state);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectInputFocusHandler: Going to get reply with size [%d].\n",
+              (int) rep -> generic.length << 2);
+  #endif
+
+  async_rep = (xGetInputFocusReply *) _XGetAsyncReply(dpy, async_head, rep, buf, len, 0, False);
+
+  if (async_rep == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******_NXCollectInputFocusHandler: PANIC! Failed to get reply with resource [%d].\n",
+                state -> resource);
+    #endif
+
+    _NXNotifyInputFocus(dpy, state -> resource, False);
+
+    _NXCollectedInputFocuses[state -> resource] = NULL;
+
+    Xfree(state);
+
+    Xfree(async_head);
+
+    return False;
+  }
+
+  #ifdef TEST
+  fprintf(stderr, "******_NXCollectInputFocusHandler: Got reply with focus [%d] revert to [%d] "
+              "size [%d].\n", (int) async_rep -> focus, (int) async_rep -> revertTo,
+                  (int) async_rep -> length << 2);
+  #endif
+
+  state -> focus     = async_rep -> focus;
+  state -> revert_to = async_rep -> revertTo;
+
+  _NXNotifyInputFocus(dpy, state -> resource, True);
+
+  Xfree(async_head);
+
+  return True;
+}
+
+int NXGetCollectInputFocusResource(Display *dpy)
+{
+  int i;
+
+  for (i = 0; i < NXNumberOfResources; i++)
+  {
+    if (_NXCollectedInputFocuses[i] == NULL)
+    {
+      return i;
+    }
+  }
+
+  return -1;
+}
+
+int NXCollectInputFocus(Display *dpy, unsigned int resource)
+{
+  register xReq *req;
+
+  _NXCollectInputFocusState *state;
+  _XAsyncHandler *handler;
+
+  if (resource >= NXNumberOfResources)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectInputFocus: PANIC! Provided resource [%u] is out of range.\n",
+                resource);
+    #endif
+
+    return -1;
+  }
+
+  state = _NXCollectedInputFocuses[resource];
+
+  if (state != NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectInputFocus: PANIC! Having to remove previous state for resource [%u].\n",
+                resource);
+    #endif
+
+    if (state -> handler != NULL)
+    {
+      DeqAsyncHandler(dpy, state -> handler);
+
+      Xfree(state -> handler);
+    }
+
+    Xfree(state);
+
+    _NXCollectedInputFocuses[resource] = NULL;
+  }
+
+  LockDisplay(dpy);
+
+  GetEmptyReq(GetInputFocus, req);
+
+  #ifdef TEST
+  fprintf(stderr, "******NXCollectInputFocus: Sending message opcode [%d] sequence [%ld] for resource [%d].\n",
+              X_GetInputFocus, dpy -> request, resource);
+  #endif
+
+  state   = Xmalloc(sizeof(_NXCollectInputFocusState));
+  handler = Xmalloc(sizeof(_XAsyncHandler));
+
+  if (state == NULL || handler == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXCollectInputFocus: Failed to allocate memory with resource [%d].\n",
+                resource);
+    #endif
+
+    if (state != NULL)
+    {
+      Xfree(state);
+    }
+
+    if (handler != NULL)
+    {
+      Xfree(handler);
+    }
+
+    UnGetEmptyReq();
+
+    UnlockDisplay(dpy);
+
+    return -1;
+  }
+
+  state -> sequence  = dpy -> request;
+  state -> resource  = resource;
+  state -> focus     = 0;
+  state -> revert_to = 0;
+
+  state -> handler = handler;
+
+  handler -> next = dpy -> async_handlers;
+  handler -> handler = _NXCollectInputFocusHandler;
+  handler -> data = (XPointer) state;
+  dpy -> async_handlers = handler;
+
+  _NXCollectedInputFocuses[resource] = state;
+
+  UnlockDisplay(dpy);
+
+  SyncHandle();
+
+  return True;
+}
+
+int NXGetCollectedInputFocus(Display *dpy, unsigned int resource,
+                                 Window *focus_return, int *revert_to_return)
+{
+  register _NXCollectInputFocusState *state;
+
+  state = _NXCollectedInputFocuses[resource];
+
+  if (state == NULL)
+  {
+    #ifdef PANIC
+    fprintf(stderr, "******NXGetCollectedInputFocus: PANIC! No data collected for resource [%u].\n",
+                resource);
+    #endif
+
+    return 0;
+  }
+
+  *focus_return     = state -> focus;
+  *revert_to_return = state -> revert_to;
+
+  Xfree(state);
+
+  _NXCollectedInputFocuses[resource] = NULL;
+
+  #ifdef TEST
+  fprintf(stderr, "******NXGetCollectedInputFocus: Returning GetInputFocus data for resource [%u].\n",
+              resource);
+  #endif
+
+  return True;
+}
+
+#ifdef DUMP
+
+void _NXDumpData(const unsigned char *buffer, unsigned int size)
+{
+  if (buffer != NULL)
+  {
+    unsigned int i = 0;
+
+    unsigned int ii;
+
+    while (i < size)
+    {
+      fprintf(stderr, "[%d]\t", i);
+
+      for (ii = 0; i < size && ii < 8; i++, ii++)
+      {
+        fprintf(stderr, "%d\t", (unsigned int) (buffer[i]));
+      }
+
+      fprintf(stderr, "\n");
+    }
+  }
+}
+
+#endif