debian/patches/401_nxcomp_bigrequests-and-genericevent-extensions.full+lite.patch: Move into debian/patches-pending-evaluation/.

1 files changed, 1870 insertions, 0 deletions

diff --git a/debian/patches-pending-evaluation/401_nxcomp_bigrequests-and-genericevent-extensions.full+lite.patch b/debian/patches-pending-evaluation/401_nxcomp_bigrequests-and-genericevent-extensions.full+lite.patch
new file mode 100644
index 000000000..ab16864df
--- /dev/null
+++ b/debian/patches-pending-evaluation/401_nxcomp_bigrequests-and-genericevent-extensions.full+lite.patch
@@ -0,0 +1,1870 @@
+--- a/nxcomp/ClientChannel.cpp
++++ b/nxcomp/ClientChannel.cpp
+@@ -447,6 +447,26 @@
+         }
+       }
+ 
++      // Get other bits of the header, so will not need to refer to them again
++      unsigned char inputDataByte = inputMessage[1];
++      unsigned int buffer2 = GetUINT(inputMessage + 2, bigEndian_);
++      unsigned int inputDataSize = buffer2 - 1;
++      if (buffer2 == 0)
++      {
++        // BIG-REQUESTS
++        inputMessage += 4;
++        inputLength -= 4;
++        inputDataSize = GetULONG(inputMessage, bigEndian_) - 2;
++      }
++      if (inputLength != (4 * (inputDataSize + 1)))
++      {
++        #ifdef WARNING
++        *logofs << "handleRead: inputLength=" << inputLength
++                << " mismatch inputDataSize=" << inputDataSize
++                << ".\n" << logofs_flush;
++        #endif
++      }
++
+       //
+       // Go to the message's specific encoding.
+       //
+@@ -455,6 +475,11 @@
+       {
+       case X_AllocColor:
+         {
++          #ifdef WARNING
++          if (inputLength < 14)
++            *logofs << "handleRead: X_AllocColor inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 4, bigEndian_), 29,
+                              clientCache_ -> colormapCache);
+           const unsigned char *nextSrc = inputMessage + 8;
+@@ -476,6 +501,11 @@
+         break;
+       case X_ReparentWindow:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_ReparentWindow inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> windowCache);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 8, bigEndian_),
+@@ -486,6 +516,11 @@
+         break;
+       case X_ChangeProperty:
+         {
++          #ifdef WARNING
++          if (inputLength < 24)
++            *logofs << "handleRead: X_ChangeProperty inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           MessageStore *messageStore = clientStore_ ->
+                                getRequestStore(X_ChangeProperty);
+ 
+@@ -501,8 +536,36 @@
+           encodeBuffer.encodeCachedValue(format, 8,
+                              clientCache_ -> changePropertyFormatCache);
+           unsigned int dataLength = GetULONG(inputMessage + 20, bigEndian_);
++
++          // Self-preserving sanity check (otherwise we crash and dump core):
++          // some clients do this when not getting their beloved BIG-REQUESTS.
++          unsigned int maxLength = 0;
++          if (format == 8)
++          {
++            maxLength = inputLength - 24;
++          }
++          else if (format == 32)
++          {
++            maxLength = (inputLength - 24) >> 2;
++          }
++          else if (format == 16)
++          {
++            maxLength = (inputLength - 24) >> 1;
++          }
++          if (dataLength > maxLength)
++          {
++            #ifdef WARNING
++            *logofs << "handleRead X_ChangeProperty bogus dataLength=" << dataLength
++                    << " set to " << maxLength
++                    << " when format=" << (int)format
++                    << " inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++            #endif
++            dataLength = maxLength;
++          }
++
+           encodeBuffer.encodeValue(dataLength, 32, 6);
+-          encodeBuffer.encodeValue(inputMessage[1], 2);
++          encodeBuffer.encodeValue(inputDataByte, 2);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> windowCache);
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 8, bigEndian_), 29,
+@@ -533,7 +596,7 @@
+               nextSrc += 4;
+             }
+           }
+-          else
++          else if (format == 16)
+           {
+             for (unsigned int i = 0; i < dataLength; i++)
+             {
+@@ -541,6 +604,13 @@
+               nextSrc += 2;
+             }
+           }
++          else
++          {
++            #ifdef WARNING
++            *logofs << "ChangeProperty bogus format=" << (int)format
++                    << ".\n" << logofs_flush;
++            #endif
++          }
+         }
+         break;
+       case X_SendEvent:
+@@ -551,6 +621,11 @@
+           // ratio.
+           //
+ 
++          #ifdef WARNING
++          if (inputLength < 44)
++            *logofs << "handleRead: X_SendEvent inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           MessageStore *messageStore = clientStore_ ->
+                                getRequestStore(X_SendEvent);
+ 
+@@ -562,7 +637,7 @@
+             break;
+           }
+ 
+-          encodeBuffer.encodeBoolValue((unsigned int) inputMessage[1]);
++          encodeBuffer.encodeBoolValue((unsigned int) inputDataByte);
+           unsigned int window = GetULONG(inputMessage + 4, bigEndian_);
+ 
+           if (window == 0 || window == 1)
+@@ -599,7 +674,12 @@
+         break;
+       case X_ChangeWindowAttributes:
+         {
+-          encodeBuffer.encodeValue((inputLength - 12) >> 2, 4);
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_ChangeWindowAttributes inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
++          encodeBuffer.encodeValue(inputDataSize - 2, 4);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> windowCache);
+           unsigned int bitmask = GetULONG(inputMessage + 8, bigEndian_);
+@@ -621,6 +701,11 @@
+         break;
+       case X_ClearArea:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_ClearArea inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -654,7 +739,7 @@
+             break;
+           }
+ 
+-          encodeBuffer.encodeBoolValue((unsigned int) inputMessage[1]);
++          encodeBuffer.encodeBoolValue((unsigned int) inputDataByte);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> windowCache);
+           const unsigned char *nextSrc = inputMessage + 8;
+@@ -668,6 +753,11 @@
+         break;
+       case X_CloseFont:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_CloseFont inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           unsigned int font = GetULONG(inputMessage + 4, bigEndian_);
+           encodeBuffer.encodeValue(font - clientCache_ -> lastFont, 29, 5);
+           clientCache_ -> lastFont = font;
+@@ -675,6 +765,11 @@
+         break;
+       case X_ConfigureWindow:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_ConfigureWindow inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           MessageStore *messageStore = clientStore_ ->
+                                getRequestStore(X_ConfigureWindow);
+ 
+@@ -708,6 +803,11 @@
+         break;
+       case X_ConvertSelection:
+         {
++          #ifdef WARNING
++          if (inputLength < 24)
++            *logofs << "handleRead: X_ConvertSelection inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 4, bigEndian_), 29,
+                              clientCache_ -> convertSelectionRequestorCache, 9);
+           const unsigned char* nextSrc = inputMessage + 8;
+@@ -725,6 +825,11 @@
+         break;
+       case X_CopyArea:
+         {
++          #ifdef WARNING
++          if (inputLength < 28)
++            *logofs << "handleRead: X_CopyArea inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -793,6 +898,11 @@
+         break;
+       case X_CopyGC:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_CopyGC inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int s_g_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -814,6 +924,11 @@
+         break;
+       case X_CopyPlane:
+         {
++          #ifdef WARNING
++          if (inputLength < 32)
++            *logofs << "handleRead: X_CopyPlane inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4,
+                              bigEndian_), clientCache_ -> drawableCache);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 8,
+@@ -833,6 +948,11 @@
+         break;
+       case X_CreateGC:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_CreateGC inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int g_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -917,6 +1037,11 @@
+         break;
+       case X_ChangeGC:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_ChangeGC inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int g_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -998,14 +1123,19 @@
+         break;
+       case X_CreatePixmap:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_CreatePixmap inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+-          *logofs << "handleRead: X_CreatePixmap depth " << (unsigned) inputMessage[1]
++          *logofs << "handleRead: X_CreatePixmap depth " << (unsigned) inputDataByte
+                   << ", pixmap id " << GetULONG(inputMessage + 4, bigEndian_)
+                   << ", drawable " << GetULONG(inputMessage + 8, bigEndian_)
+                   << ", width " << GetUINT(inputMessage + 12, bigEndian_)
+                   << ", height " << GetUINT(inputMessage + 14, bigEndian_)
+-                  << ", size " << GetUINT(inputMessage + 2, bigEndian_) << 2
++                  << ", length " << inputLength
+                   << ".\n" << logofs_flush;
+ 
+           unsigned int   p_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -1042,6 +1172,11 @@
+         break;
+       case X_CreateWindow:
+         {
++          #ifdef WARNING
++          if (inputLength < 32)
++            *logofs << "handleRead: X_CreateWindow inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int w_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -1054,7 +1189,7 @@
+           #endif
+ 
+           unsigned bitmask = GetULONG(inputMessage + 28, bigEndian_);
+-          encodeBuffer.encodeCachedValue((unsigned int) inputMessage[1], 8,
++          encodeBuffer.encodeCachedValue((unsigned int) inputDataByte, 8,
+                                          clientCache_ -> depthCache);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 8, bigEndian_),
+                              clientCache_ -> windowCache);
+@@ -1098,6 +1233,11 @@
+         break;
+       case X_DeleteProperty:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_DeleteProperty inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> windowCache);
+           encodeBuffer.encodeValue(GetULONG(inputMessage + 8, bigEndian_), 29, 9);
+@@ -1105,6 +1245,11 @@
+         break;
+       case X_FillPoly:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_FillPoly inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -1138,7 +1283,7 @@
+             break;
+           }
+ 
+-          unsigned int numPoints = ((inputLength - 16) >> 2);
++          unsigned int numPoints = (inputDataSize - 3);
+ 
+           if (control -> isProtoStep10() == 1)
+           {
+@@ -1209,7 +1354,12 @@
+         break;
+       case X_FreeColors:
+         {
+-          unsigned int numPixels = GetUINT(inputMessage + 2, bigEndian_) - 3;
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_FreeColors inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
++          unsigned int numPixels = inputDataSize - 2;
+           encodeBuffer.encodeValue(numPixels, 16, 4);
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 4, bigEndian_), 29,
+                                          clientCache_ -> colormapCache);
+@@ -1225,12 +1375,22 @@
+         break;
+       case X_FreeCursor:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_FreeCursor inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 4, bigEndian_),
+                                          29, clientCache_ -> cursorCache, 9);
+         }
+         break;
+       case X_FreeGC:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_FreeGC inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int g_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -1284,6 +1444,11 @@
+         break;
+       case X_FreePixmap:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_FreePixmap inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int p_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -1318,6 +1483,11 @@
+         break;
+       case X_GetAtomName:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_GetAtomName inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeValue(GetULONG(inputMessage + 4, bigEndian_), 29, 9);
+ 
+           sequenceQueue_.push(clientSequence_, inputOpcode);
+@@ -1327,6 +1497,11 @@
+         break;
+       case X_GetGeometry:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_GetGeometry inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> drawableCache);
+ 
+@@ -1351,6 +1526,11 @@
+         break;
+       case X_GetKeyboardMapping:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_GetKeyboardMapping inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeValue((unsigned int) inputMessage[4], 8);
+           encodeBuffer.encodeValue((unsigned int) inputMessage[5], 8);
+ 
+@@ -1361,6 +1541,11 @@
+         break;
+       case X_GetProperty:
+         {
++          #ifdef WARNING
++          if (inputLength < 24)
++            *logofs << "handleRead: X_GetProperty inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           MessageStore *messageStore = clientStore_ ->
+                                getRequestStore(X_GetProperty);
+ 
+@@ -1378,7 +1563,7 @@
+             break;
+           }
+ 
+-          encodeBuffer.encodeBoolValue((unsigned int) inputMessage[1]);
++          encodeBuffer.encodeBoolValue((unsigned int) inputDataByte);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> windowCache);
+           unsigned int property = GetULONG(inputMessage + 8, bigEndian_);
+@@ -1394,6 +1579,11 @@
+         break;
+       case X_GetSelectionOwner:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_GetSelectionOwner inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 4, bigEndian_), 29,
+                              clientCache_ -> getSelectionOwnerSelectionCache, 9);
+ 
+@@ -1404,7 +1594,12 @@
+         break;
+       case X_GrabButton:
+         {
+-          encodeBuffer.encodeBoolValue((unsigned int) inputMessage[1]);
++          #ifdef WARNING
++          if (inputLength < 24)
++            *logofs << "handleRead: X_GrabButton inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
++          encodeBuffer.encodeBoolValue((unsigned int) inputDataByte);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> windowCache);
+           encodeBuffer.encodeCachedValue(GetUINT(inputMessage + 8, bigEndian_), 16,
+@@ -1423,7 +1618,12 @@
+         break;
+       case X_GrabPointer:
+         {
+-          encodeBuffer.encodeBoolValue((unsigned int) inputMessage[1]);
++          #ifdef WARNING
++          if (inputLength < 24)
++            *logofs << "handleRead: X_GrabPointer inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
++          encodeBuffer.encodeBoolValue((unsigned int) inputDataByte);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> windowCache);
+           encodeBuffer.encodeCachedValue(GetUINT(inputMessage + 8, bigEndian_), 16,
+@@ -1448,7 +1648,12 @@
+         break;
+       case X_GrabKeyboard:
+         {
+-          encodeBuffer.encodeBoolValue((unsigned int) inputMessage[1]);
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_GrabKeyboard inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
++          encodeBuffer.encodeBoolValue((unsigned int) inputDataByte);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> windowCache);
+           unsigned int timestamp = GetULONG(inputMessage + 8, bigEndian_);
+@@ -1471,6 +1676,11 @@
+         break;
+       case X_PolyText8:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_PolyText8 inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -1555,6 +1765,11 @@
+         break;
+       case X_PolyText16:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_PolyText16 inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -1639,6 +1854,11 @@
+         break;
+       case X_ImageText8:
+         {
++          #ifdef WARNING
++          if (inputLength < 16 + (unsigned int)inputDataByte)
++            *logofs << "handleRead: X_ImageText8 inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -1673,7 +1893,7 @@
+             break;
+           }
+ 
+-          unsigned int textLength = (unsigned int) inputMessage[1];
++          unsigned int textLength = (unsigned int) inputDataByte;
+           encodeBuffer.encodeCachedValue(textLength, 8,
+                              clientCache_ -> imageTextLengthCache, 4);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4,
+@@ -1706,6 +1926,11 @@
+         break;
+       case X_ImageText16:
+         {
++          #ifdef WARNING
++          if (inputLength < 16 + (unsigned int)inputDataByte)
++            *logofs << "handleRead: X_ImageText16 inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -1740,7 +1965,7 @@
+             break;
+           }
+ 
+-          unsigned int textLength = (unsigned int) inputMessage[1];
++          unsigned int textLength = (unsigned int) inputDataByte;
+           encodeBuffer.encodeCachedValue(textLength, 8,
+                              clientCache_ -> imageTextLengthCache, 4);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4,
+@@ -1773,6 +1998,11 @@
+         break;
+       case X_InternAtom:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_InternAtom inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           MessageStore *messageStore = clientStore_ ->
+                                getRequestStore(X_InternAtom);
+ 
+@@ -1796,8 +2026,18 @@
+           }
+ 
+           unsigned int nameLength = GetUINT(inputMessage + 4, bigEndian_);
++          unsigned int maxLength = inputLength - 8;
++          if (nameLength > maxLength)
++          {
++            #ifdef WARNING
++            *logofs << "handleRead X_InternAtom bogus nameLength=" << nameLength
++                    << " set to " << maxLength
++                    << ".\n" << logofs_flush;
++            #endif
++            nameLength = maxLength;
++          }
+           encodeBuffer.encodeValue(nameLength, 16, 6);
+-          encodeBuffer.encodeBoolValue((unsigned int) inputMessage[1]);
++          encodeBuffer.encodeBoolValue((unsigned int) inputDataByte);
+           const unsigned char *nextSrc = inputMessage + 8;
+ 
+           if (control -> isProtoStep7() == 1)
+@@ -1827,7 +2067,22 @@
+         break;
+       case X_ListFonts:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_ListFonts inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           unsigned int textLength = GetUINT(inputMessage + 6, bigEndian_);
++          unsigned int maxLength = inputLength - 8;
++          if (textLength > maxLength)
++          {
++            #ifdef WARNING
++            *logofs << "handleRead X_ListFonts bogus textLength=" << textLength
++                    << " set to " << maxLength
++                    << ".\n" << logofs_flush;
++            #endif
++            textLength = maxLength;
++          }
+           encodeBuffer.encodeValue(textLength, 16, 6);
+           encodeBuffer.encodeValue(GetUINT(inputMessage + 4, bigEndian_), 16, 6);
+           const unsigned char* nextSrc = inputMessage + 8;
+@@ -1853,7 +2108,22 @@
+       case X_LookupColor:
+       case X_AllocNamedColor:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_AllocNamedColor inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           unsigned int textLength = GetUINT(inputMessage + 8, bigEndian_);
++          unsigned int maxLength = inputLength - 12;
++          if (textLength > maxLength)
++          {
++            #ifdef WARNING
++            *logofs << "handleRead X_AllocNamedColor bogus textLength=" << textLength
++                    << " set to " << maxLength
++                    << ".\n" << logofs_flush;
++            #endif
++            textLength = maxLength;
++          }
+           encodeBuffer.encodeValue(textLength, 16, 6);
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 4, bigEndian_),
+                                          29, clientCache_ -> colormapCache);
+@@ -1886,6 +2156,11 @@
+       case X_QueryPointer:
+       case X_QueryTree:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_MapWindow...X_QueryTree inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           if (inputOpcode == X_DestroyWindow)
+@@ -1923,7 +2198,22 @@
+         break;
+       case X_OpenFont:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_OpenFont inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           unsigned int nameLength = GetUINT(inputMessage + 8, bigEndian_);
++          unsigned int maxLength = inputLength - 12;
++          if (nameLength > maxLength)
++          {
++            #ifdef WARNING
++            *logofs << "handleRead X_InternAtom bogus nameLength=" << nameLength
++                    << " set to " << maxLength
++                    << ".\n" << logofs_flush;
++            #endif
++            nameLength = maxLength;
++          }
+           encodeBuffer.encodeValue(nameLength, 16, 7);
+           unsigned int font = GetULONG(inputMessage + 4, bigEndian_);
+           encodeBuffer.encodeValue(font - clientCache_ -> lastFont, 29, 5);
+@@ -1947,6 +2237,11 @@
+         break;
+       case X_PolyFillRectangle:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_PolyFillRectangle inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -2034,6 +2329,11 @@
+         break;
+       case X_PolyFillArc:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_PolyFillArc inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -2135,6 +2435,11 @@
+         break;
+       case X_PolyArc:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_PolyArc inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -2236,6 +2541,11 @@
+         break;
+       case X_PolyPoint:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_PolyPoint inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -2269,8 +2579,8 @@
+             break;
+           }
+ 
+-          encodeBuffer.encodeValue(GetUINT(inputMessage + 2, bigEndian_) - 3, 16, 4);
+-          encodeBuffer.encodeBoolValue((unsigned int) inputMessage[1]);
++          encodeBuffer.encodeValue(inputDataSize - 2, 32, 4);
++          encodeBuffer.encodeBoolValue((unsigned int) inputDataByte);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> drawableCache);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 8, bigEndian_),
+@@ -2303,6 +2613,11 @@
+         break;
+       case X_PolyLine:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_PolyLine inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -2336,8 +2651,8 @@
+             break;
+           }
+ 
+-          encodeBuffer.encodeValue(GetUINT(inputMessage + 2, bigEndian_) - 3, 16, 4);
+-          encodeBuffer.encodeBoolValue((unsigned int) inputMessage[1]);
++          encodeBuffer.encodeValue(inputDataSize - 2, 32, 4);
++          encodeBuffer.encodeBoolValue((unsigned int) inputDataByte);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4,
+                              bigEndian_), clientCache_ -> drawableCache);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 8,
+@@ -2370,8 +2685,12 @@
+         break;
+       case X_PolyRectangle:
+         {
+-          encodeBuffer.encodeValue((GetUINT(inputMessage + 2,
+-                                            bigEndian_) - 3) >> 1, 16, 3);
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_PolyRectangle inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
++          encodeBuffer.encodeValue((inputDataSize - 2) >> 1, 32, 3);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4,
+                              bigEndian_), clientCache_ -> drawableCache);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 8,
+@@ -2391,6 +2710,11 @@
+         break;
+       case X_PolySegment:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_PolySegment inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -2424,8 +2748,7 @@
+             break;
+           }
+ 
+-          encodeBuffer.encodeValue((GetUINT(inputMessage + 2,
+-                                            bigEndian_) - 3) >> 1, 16, 4);
++          encodeBuffer.encodeValue((inputDataSize - 2) >> 1, 32, 4);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4,
+                              bigEndian_), clientCache_ -> drawableCache);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 8,
+@@ -2491,6 +2814,11 @@
+         break;
+       case X_PutImage:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_PutImage inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -2522,7 +2850,12 @@
+         break;
+       case X_QueryBestSize:
+         {
+-          encodeBuffer.encodeValue((unsigned int)inputMessage[1], 2);
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_QueryBestSize inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
++          encodeBuffer.encodeValue((unsigned int)inputDataByte, 2);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4,
+                              bigEndian_), clientCache_ -> drawableCache);
+           encodeBuffer.encodeValue(GetUINT(inputMessage + 8, bigEndian_), 16, 8);
+@@ -2535,10 +2868,15 @@
+         break;
+       case X_QueryColors:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_QueryColors inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           // Differential encoding.
+           encodeBuffer.encodeBoolValue(1);
+ 
+-          unsigned int numColors = ((inputLength - 8) >> 2);
++          unsigned int numColors = (inputDataSize - 1);
+           encodeBuffer.encodeValue(numColors, 16, 5);
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 4, bigEndian_), 29,
+                                          clientCache_ -> colormapCache);
+@@ -2567,15 +2905,20 @@
+         break;
+       case X_QueryExtension:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_QueryExtension inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TEST
+ 
+           char data[256];
+ 
+           int length = GetUINT(inputMessage + 4, bigEndian_);
+ 
+-          if (length > 256)
++          if (length > 255)
+           {
+-            length = 256;
++            length = 255;
+           }
+ 
+           strncpy(data, (char *) inputMessage + 8, length);
+@@ -2588,6 +2931,16 @@
+           #endif
+ 
+           unsigned int nameLength = GetUINT(inputMessage + 4, bigEndian_);
++          unsigned int maxLength = inputLength - 8;
++          if (nameLength > maxLength)
++          {
++            #ifdef WARNING
++            *logofs << "handleRead X_QueryExtension bogus nameLength=" << nameLength
++                    << " set to " << maxLength
++                    << ".\n" << logofs_flush;
++            #endif
++            nameLength = maxLength;
++          }
+           encodeBuffer.encodeValue(nameLength, 16, 6);
+           const unsigned char *nextSrc = inputMessage + 8;
+ 
+@@ -2614,6 +2967,11 @@
+         break;
+       case X_QueryFont:
+         {
++          #ifdef WARNING
++          if (inputLength < 8)
++            *logofs << "handleRead: X_QueryFont inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           unsigned int font = GetULONG(inputMessage + 4, bigEndian_);
+           encodeBuffer.encodeValue(font - clientCache_ -> lastFont, 29, 5);
+           clientCache_ -> lastFont = font;
+@@ -2625,6 +2983,11 @@
+         break;
+       case X_SetClipRectangles:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_SetClipRectangles inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           MessageStore *messageStore = clientStore_ ->
+                                getRequestStore(X_SetClipRectangles);
+ 
+@@ -2636,7 +2999,7 @@
+             break;
+           }
+ 
+-          unsigned int numRectangles = ((inputLength - 12) >> 3);
++          unsigned int numRectangles = ((inputDataSize - 2) >> 1);
+ 
+           if (control -> isProtoStep9() == 1)
+           {
+@@ -2647,7 +3010,7 @@
+             encodeBuffer.encodeValue(numRectangles, 13, 4);
+           }
+ 
+-          encodeBuffer.encodeValue((unsigned int) inputMessage[1], 2);
++          encodeBuffer.encodeValue((unsigned int) inputDataByte, 2);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+                              clientCache_ -> gcCache);
+           encodeBuffer.encodeCachedValue(GetUINT(inputMessage + 8, bigEndian_), 16,
+@@ -2668,7 +3031,22 @@
+         break;
+       case X_SetDashes:
+         {
++          #ifdef WARNING
++          if (inputLength < 12)
++            *logofs << "handleRead: X_SetDashes inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           unsigned int numDashes = GetUINT(inputMessage + 10, bigEndian_);
++          unsigned int maxLength = inputLength - 12;
++          if (numDashes > maxLength)
++          {
++            #ifdef WARNING
++            *logofs << "handleRead X_SetDashes bogus numDashes=" << numDashes
++                    << " set to " << maxLength
++                    << ".\n" << logofs_flush;
++            #endif
++            numDashes = maxLength;
++          }
+           encodeBuffer.encodeCachedValue(numDashes, 16,
+                              clientCache_ -> setDashesLengthCache, 5);
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4, bigEndian_),
+@@ -2683,6 +3061,11 @@
+         break;
+       case X_SetSelectionOwner:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_SetSelectionOwner inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 4, bigEndian_), 29,
+                                     clientCache_ -> setSelectionOwnerCache, 9);
+           encodeBuffer.encodeCachedValue(GetULONG(inputMessage + 8, bigEndian_), 29,
+@@ -2693,6 +3076,11 @@
+         break;
+       case X_TranslateCoords:
+         {
++          #ifdef WARNING
++          if (inputLength < 16)
++            *logofs << "handleRead: X_TranslateCoords inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -2764,6 +3152,11 @@
+         break;
+       case X_GetImage:
+         {
++          #ifdef WARNING
++          if (inputLength < 20)
++            *logofs << "handleRead: X_GetImage inputLength=" << inputLength
++                    << ".\n" << logofs_flush;
++          #endif
+           #ifdef TARGETS
+ 
+           unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -2802,7 +3195,7 @@
+           }
+ 
+           // Format.
+-          encodeBuffer.encodeValue((unsigned int) inputMessage[1], 2);
++          encodeBuffer.encodeValue((unsigned int) inputDataByte, 2);
+           // Drawable.
+           encodeBuffer.encodeXidValue(GetULONG(inputMessage + 4,
+                              bigEndian_), clientCache_ -> drawableCache);
+@@ -2869,6 +3262,11 @@
+           }
+           else if (inputOpcode == opcodeStore_ -> putPackedImage)
+           {
++            #ifdef WARNING
++            if (inputLength < 24)
++              *logofs << "handleRead: putPackedImage inputLength=" << inputLength
++                      << ".\n" << logofs_flush;
++            #endif
+             #ifdef TARGETS
+ 
+             unsigned int t_id = GetULONG(inputMessage + 4, bigEndian_);
+@@ -3004,7 +3402,7 @@
+                     << ".\n" << logofs_flush;
+             #endif
+ 
+-            encodeBuffer.encodeCachedValue(*(inputMessage + 1), 8,
++            encodeBuffer.encodeCachedValue(inputDataByte, 8,
+                          clientCache_ -> resourceCache);
+           }
+           else if (inputOpcode == opcodeStore_ -> freeUnpack)
+@@ -3015,7 +3413,7 @@
+                     << ".\n" << logofs_flush;
+             #endif
+ 
+-            encodeBuffer.encodeCachedValue(*(inputMessage + 1), 8,
++            encodeBuffer.encodeCachedValue(inputDataByte, 8,
+                          clientCache_ -> resourceCache);
+           }
+           else if (inputOpcode == opcodeStore_ -> getControlParameters)
+@@ -3130,6 +3528,11 @@
+             // Enable or disable expose events
+             // coming from the real server.
+             //
++            #ifdef WARNING
++            if (inputLength < 8)
++              *logofs << "handleRead: setExposeParameters inputLength=" << inputLength
++                      << ".\n" << logofs_flush;
++            #endif
+ 
+             encodeBuffer.encodeBoolValue(*(inputMessage + 4));
+             encodeBuffer.encodeBoolValue(*(inputMessage + 5));
+@@ -3198,10 +3601,10 @@
+       {
+         if (hit)
+         {
+-          statistics -> addRenderCachedRequest(*(inputMessage + 1));
++          statistics -> addRenderCachedRequest(inputDataByte);
+         }
+ 
+-        statistics -> addRenderRequestBits(*(inputMessage + 1), inputLength << 3, bits);
++        statistics -> addRenderRequestBits(inputDataByte, inputLength << 3, bits);
+       }
+ 
+     }  // End if (firstRequest_)... else ...
+@@ -4548,10 +4951,10 @@
+         //
+ 
+ /*
+-FIXME: Recover the sequence number if the proxy
++Fixed as below? - FIXME: Recover the sequence number if the proxy
+        is not connected to an agent.
+ */
+-        if (serverSequence_ > lastSequence_ ||
++        if (SequenceNumber_x_gt_y(serverSequence_, lastSequence_) ||
+                 control -> SessionMode != session_proxy)
+         {
+           #ifdef DEBUG
+@@ -4564,7 +4967,7 @@
+           lastSequence_ = serverSequence_;
+         }
+         #ifdef DEBUG
+-        else if (serverSequence_ < lastSequence_)
++        else if (SequenceNumber_x_gt_y(lastSequence_, serverSequence_))
+         {
+           //
+           // Use our last auto-generated sequence.
+@@ -5003,6 +5406,12 @@
+           break;
+         default:
+           {
++            // BEWARE: not only inputOpcode == GenericEvent but also
++            // others not handled above, at least:
++            //   GraphicsExpose    13
++            //   MapRequest        20
++            //   ConfigureRequest  23
++            // and any beyond LASTEvent.
+             #ifdef TEST
+             *logofs << "handleWrite: Using generic event compression "
+                     << "for OPCODE#" << (unsigned int) outputOpcode
+@@ -5014,11 +5423,51 @@
+ 
+             for (unsigned int i = 0; i < 14; i++)
+             {
+-              decodeBuffer.decodeCachedValue(value, 16,
+-                           *serverCache_ -> genericEventIntCache[i]);
++              //decodeBuffer.decodeCachedValue(value, 16,
++              //             *serverCache_ -> genericEventIntCache[i]);
++              if ( ! (decodeBuffer.decodeCachedValue(value, 16,
++                           *serverCache_ -> genericEventIntCache[i])) )
++              {
++                #ifdef WARNING
++                *logofs << "decodeCachedValue failed for GenEvt:"
++                        << " buffer length=" << length
++                        << " i=" << i
++                        << "\n" << logofs_flush;
++                #endif
++                break;
++              }
+ 
+               PutUINT(value, outputMessage + i * 2 + 4, bigEndian_);
+             }
++            // Handle "X Generic Event Extension"
++            // Extra data is not cached...
++            if (outputOpcode == GenericEvent && *(outputMessage+1) != 0 && outputLength == 32)
++            {
++              unsigned int extraOutputLength = (GetULONG(outputMessage + 4, bigEndian_) << 2);
++              if (extraOutputLength > 0 && extraOutputLength < 100*1024*1024)
++              {
++                // Extend buffer for the extra data
++                outputMessage = writeBuffer_.addMessage(extraOutputLength);
++                // Decode data and write into buffer at new position
++                for (unsigned int i = 0; i < (extraOutputLength>>1); i++)
++                {
++                  //decodeBuffer.decodeValue(value, 16);
++                  if ( ! (decodeBuffer.decodeValue(value, 16)) )
++                  {
++                    #ifdef WARNING
++                    *logofs << "decodeValue failed for GenEvt:"
++                            << " extraOutputLength=" << extraOutputLength
++                            << " buffer length=" << length
++                            << " i=" << i
++                            << "\n" << logofs_flush;
++                    #endif
++                    break;
++                  }
++                  PutUINT(value, outputMessage + i * 2, bigEndian_);
++                }
++              }
++            }
++
+           }
+         } // End of switch (outputOpcode)...
+ 
+@@ -6892,7 +7341,7 @@
+   }
+   else
+   {
+-    if (serverSequence_ > lastSequence_)
++    if (SequenceNumber_x_gt_y(serverSequence_, lastSequence_))
+     {
+       #ifdef DEBUG
+       *logofs << "handleNotify: Updating last event's sequence "
+@@ -6904,7 +7353,7 @@
+       lastSequence_ = serverSequence_;
+     }
+     #ifdef DEBUG
+-    else if (serverSequence_ < lastSequence_)
++    else if (SequenceNumber_x_gt_y(lastSequence_, serverSequence_))
+     {
+       //
+       // Use our last auto-generated sequence.
+--- a/nxcomp/ClientReadBuffer.cpp
++++ b/nxcomp/ClientReadBuffer.cpp
+@@ -119,15 +119,34 @@
+ 
+     dataLength = (GetUINT(start + 2, bigEndian_) << 2);
+ 
+-    if (dataLength < 4)
++    if (dataLength == 0)        // or equivalently (dataLength < 4)
+     {
+-      #ifdef TEST
+-      *logofs << "ClientReadBuffer: WARNING! Assuming length 4 "
+-              << "for suspicious message of length " << dataLength
+-              << ".\n" << logofs_flush;
+-      #endif
++      // BIG-REQUESTS extension
++      if (size < 8)
++      {
++        remaining_ = 8 - size;
++        return 0;
++      }
+ 
+-      dataLength = 4;
++      dataLength = (GetULONG(start + 4, bigEndian_) << 2);
++
++// See WRITE_BUFFER_OVERFLOW_SIZE elsewhere
++// and also ENCODE_BUFFER_OVERFLOW_SIZE DECODE_BUFFER_OVERFLOW_SIZE.
++      if (dataLength < 8 || dataLength > 100*1024*1024)
++      {
++        #ifdef WARNING
++        *logofs << "BIG-REQUESTS with unacceptable dataLength="
++                << dataLength << ", now set to 8.\n" << logofs_flush;
++        #endif
++        dataLength = 8;
++      }
++      else if (dataLength < 4*64*1024)
++      {
++        #ifdef WARNING
++        *logofs << "BIG-REQUESTS with silly dataLength="
++                << dataLength << ".\n" << logofs_flush;
++        #endif
++      }
+     }
+   }
+ 
+--- a/nxcomp/DecodeBuffer.cpp
++++ b/nxcomp/DecodeBuffer.cpp
+@@ -78,34 +78,45 @@
+       {
+         if (!endOkay)
+         {
+-          #ifdef PANIC
+-          *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [A] "
+-                  << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
+-                  << " end_ = " << (end_ - buffer_) << ".\n"
+-                  << logofs_flush;
++          #ifdef WARNING
++          *logofs << "DecodeBuffer: Error [A] in decodeValue(), returning 0:"
++                  << " nextSrc_ = " << (nextSrc_ - buffer_)
++                  << " end_ = " << (end_ - buffer_)
++                  << ".\n" << logofs_flush;
+           #endif
+-
+-          //
+-          // Label "context" is just used to identify
+-          // the routine which detected the problem in
+-          // present source file.
+-          //
+-
+-          cerr << "Error" << ": Failure decoding data in context [A].\n";
+-
+-          HandleAbort();
++          value = 0;
++          return 0;
++          //#ifdef PANIC
++          //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [A] "
++          //        << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
++          //        << " end_ = " << (end_ - buffer_) << ".\n"
++          //        << logofs_flush;
++          //#endif
++          ////
++          //// Label "context" is just used to identify
++          //// the routine which detected the problem in
++          //// present source file.
++          ////
++          //cerr << "Error" << ": Failure decoding data in context [A].\n";
++          //HandleAbort();
+         }
+ 
+-        #ifdef PANIC
+-        *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [B] "
+-                << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
+-                << " end_ = " << (end_ - buffer_) << ".\n"
+-                << logofs_flush;
++        #ifdef WARNING
++        *logofs << "DecodeBuffer: Error [B] in decodeValue(), returning 0:"
++                << " nextSrc_ = " << (nextSrc_ - buffer_)
++                << " end_ = " << (end_ - buffer_)
++                << ".\n" << logofs_flush;
+         #endif
+-
+-        cerr << "Error" << ": Failure decoding data in context [B].\n";
+-
+-        HandleAbort();
++        value = 0;
++        return 0;
++        //#ifdef PANIC
++        //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [B] "
++        //        << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
++        //        << " end_ = " << (end_ - buffer_) << ".\n"
++        //        << logofs_flush;
++        //#endif
++        //cerr << "Error" << ": Failure decoding data in context [B].\n";
++        //HandleAbort();
+       }
+ 
+       lastBit = (nextSrcChar & srcMask_);
+@@ -134,28 +145,40 @@
+       {
+         if (!endOkay)
+         {
+-          #ifdef PANIC
+-          *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [C] "
+-                  << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
+-                  << " end_ = " << (end_ - buffer_) << ".\n"
+-                  << logofs_flush;
++          #ifdef WARNING
++          *logofs << "DecodeBuffer: Error [C] in decodeValue(), returning 0:"
++                  << " nextSrc_ = " << (nextSrc_ - buffer_)
++                  << " end_ = " << (end_ - buffer_)
++                  << ".\n" << logofs_flush;
+           #endif
+-
+-          cerr << "Error" << ": Failure decoding data in context [C].\n";
+-
+-          HandleAbort();
++          value = 0;
++          return 0;
++          //#ifdef PANIC
++          //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [C] "
++          //        << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
++          //        << " end_ = " << (end_ - buffer_) << ".\n"
++          //        << logofs_flush;
++          //#endif
++          //cerr << "Error" << ": Failure decoding data in context [C].\n";
++          //HandleAbort();
+         }
+ 
+-        #ifdef PANIC
+-        *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [D] "
+-                << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
+-                << " end_ = " << (end_ - buffer_) << ".\n"
+-                << logofs_flush;
++        #ifdef WARNING
++        *logofs << "DecodeBuffer: Error [D] in decodeValue(), returning 0:"
++                << " nextSrc_ = " << (nextSrc_ - buffer_)
++                << " end_ = " << (end_ - buffer_)
++                << ".\n" << logofs_flush;
+         #endif
+-
+-        cerr << "Error" << ": Failure decoding data in context [D].\n";
+-
+-        HandleAbort();
++        value = 0;
++        return 0;
++        //#ifdef PANIC
++        //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [D] "
++        //        << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
++        //        << " end_ = " << (end_ - buffer_) << ".\n"
++        //        << logofs_flush;
++        //#endif
++        //cerr << "Error" << ": Failure decoding data in context [D].\n";
++        //HandleAbort();
+       }
+ 
+       unsigned char moreData = (nextSrcChar & srcMask_);
+@@ -212,16 +235,24 @@
+ 
+   if (nextSrc_ >= end_)
+   {
+-    #ifdef PANIC
+-    *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [E] "
+-            << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
+-            << " end_ = " << (end_ - buffer_) << ".\n"
+-            << logofs_flush;
++    #ifdef WARNING
++    *logofs << "DecodeBuffer: Error [E] in decodeCachedValue(), returning 0:"
++            << " nextSrc_ = " << (nextSrc_ - buffer_)
++            << " end_ = " << (end_ - buffer_)
++            << ".\n" << logofs_flush;
+     #endif
+-
+-    cerr << "Error" << ": Failure decoding data in context [E].\n";
+-
+-    HandleAbort();
++    // Failed: return value 0
++    value = 0;
++    // Failed: return 0, though our callers do not check that...
++    return 0;
++    //#ifdef PANIC
++    //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [E] "
++    //        << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
++    //        << " end_ = " << (end_ - buffer_) << ".\n"
++    //        << logofs_flush;
++    //#endif
++    //cerr << "Error" << ": Failure decoding data in context [E].\n";
++    //HandleAbort();
+   }
+ 
+   unsigned int index = 0;
+@@ -237,30 +268,33 @@
+       nextSrc_++;
+       if (nextSrc_ >= end_)
+       {
+-        if (!endOkay)
+-        {
+-          #ifdef PANIC
+-          *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [F] "
+-                  << "in decodeCachedValue() nextSrc_ = "
+-                  << (nextSrc_ - buffer_) << " end_ = "
+-                  << (end_ - buffer_) << ".\n" << logofs_flush;
+-          #endif
+-
+-          cerr << "Error" << ": Failure decoding data in context [F].\n";
+-
+-          HandleAbort();
+-        }
+-
+-        #ifdef PANIC
+-        *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [G] "
+-                << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
+-                << " end_ = " << (end_ - buffer_) << ".\n"
+-                << logofs_flush;
++        #ifdef WARNING
++        *logofs << "DecodeBuffer: Error [G] in decodeCachedValue(), returning 0:"
++                << " nextSrc_ = " << (nextSrc_ - buffer_)
++                << " end_ = " << (end_ - buffer_)
++                << ".\n" << logofs_flush;
+         #endif
+-
+-        cerr << "Error" << ": Failure decoding data in context [G].\n";
+-
+-        HandleAbort();
++        value = 0;
++        return 0;
++        //if (!endOkay)
++        //{
++        //  #ifdef PANIC
++        //  *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [F] "
++        //          << "in decodeCachedValue() nextSrc_ = "
++        //          << (nextSrc_ - buffer_) << " end_ = "
++        //          << (end_ - buffer_) << ".\n" << logofs_flush;
++        //  #endif
++        //  cerr << "Error" << ": Failure decoding data in context [F].\n";
++        //  HandleAbort();
++        //}
++        //#ifdef PANIC
++        //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [G] "
++        //        << "in decodeValue() nextSrc_ = " << (nextSrc_ - buffer_)
++        //        << " end_ = " << (end_ - buffer_) << ".\n"
++        //        << logofs_flush;
++        //#endif
++        //cerr << "Error" << ": Failure decoding data in context [G].\n";
++        //HandleAbort();
+       }
+ 
+       nextSrcChar = *nextSrc_;
+@@ -288,15 +322,20 @@
+         return 1;
+       }
+ 
+-      #ifdef PANIC
+-      *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [H] "
+-              << "in decodeCacheValue() with no value found.\n"
+-              << logofs_flush;
++      #ifdef WARNING
++      *logofs << "DecodeBuffer: Error [H] in decodeCachedValue(), returning 0:"
++              << " no value found"
++              << ".\n" << logofs_flush;
+       #endif
+-
+-      cerr << "Error" << ": Failure decoding data in context [H].\n";
+-
+-      HandleAbort();
++      value = 0;
++      return 0;
++      //#ifdef PANIC
++      //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [H] "
++      //        << "in decodeCacheValue() with no value found.\n"
++      //        << logofs_flush;
++      //#endif
++      //cerr << "Error" << ": Failure decoding data in context [H].\n";
++      //HandleAbort();
+     }
+     else
+     {
+@@ -323,15 +362,20 @@
+           return 1;
+         }
+ 
+-        #ifdef PANIC
+-        *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [H] "
+-                << "in decodeCacheValue() with no value found.\n"
+-                << logofs_flush;
++        #ifdef WARNING
++        *logofs << "DecodeBuffer: Error [F] in decodeCachedValue(), returning 0:"
++                << " no value found"
++                << " .\n" << logofs_flush;
+         #endif
+-
+-        cerr << "Error" << ": Failure decoding data in context [H].\n";
+-
+-        HandleAbort();
++        value = 0;
++        return 0;
++        //#ifdef PANIC
++        //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [H] "
++        //        << "in decodeCacheValue() with no value found.\n"
++        //        << logofs_flush;
++        //#endif
++        //cerr << "Error" << ": Failure decoding data in context [H].\n";
++        //HandleAbort();
+       }
+     }
+   }
+@@ -344,16 +388,22 @@
+ 
+     if (index > cache.getSize())
+     {
+-      #ifdef PANIC
+-      *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [I] "
+-              << "in decodeCachedValue() index = " << index
+-              << " cache size = " << cache.getSize() << ".\n"
+-              << logofs_flush;
++      #ifdef WARNING
++      *logofs << "DecodeBuffer: Error [I] in decodeCachedValue(), returning 0:"
++              << " index = " << index
++              << " cache size = " << cache.getSize()
++              << ".\n" << logofs_flush;
+       #endif
+-
+-      cerr << "Error" << ": Failure decoding data in context [I].\n";
+-
+-      HandleAbort();
++      value = 0;
++      return 0;
++      //#ifdef PANIC
++      //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [I] "
++      //        << "in decodeCachedValue() index = " << index
++      //        << " cache size = " << cache.getSize() << ".\n"
++      //        << logofs_flush;
++      //#endif
++      //cerr << "Error" << ": Failure decoding data in context [I].\n";
++      //HandleAbort();
+     }
+ 
+     value = cache.get(index);
+@@ -401,16 +451,22 @@
+       {
+         if (!endOkay)
+         {
+-          #ifdef PANIC
+-          *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [K] "
+-                  << "in decodeCachedValue() nextSrc_ "
+-                  << (nextSrc_ - buffer_) << " end_ " << (end_ - buffer_)
++          #ifdef WARNING
++          *logofs << "DecodeBuffer: Error [K] in decodeCachedValue(), returning 0:"
++                  << " nextSrc_ " << (nextSrc_ - buffer_)
++                  << " end_ " << (end_ - buffer_)
+                   << ".\n" << logofs_flush;
+           #endif
+-
+-          cerr << "Error" << ": Failure decoding data in context [K].\n";
+-
+-          HandleAbort();
++          value = 0;
++          return 0;
++          //#ifdef PANIC
++          //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [K] "
++          //        << "in decodeCachedValue() nextSrc_ "
++          //        << (nextSrc_ - buffer_) << " end_ " << (end_ - buffer_)
++          //        << ".\n" << logofs_flush;
++          //#endif
++          //cerr << "Error" << ": Failure decoding data in context [K].\n";
++          //HandleAbort();
+         }
+ 
+         #ifdef TEST
+@@ -446,15 +502,20 @@
+     }
+     else
+     {
+-      #ifdef PANIC
+-      *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [M] "
+-              << "in decodeValue() with index = 2.\n"
+-              << logofs_flush;
++      #ifdef WARNING
++      *logofs << "DecodeBuffer: Error [M] in decodeCachedValue(), returning 0:"
++              << "with index = 2"
++              << ".\n" << logofs_flush;
+       #endif
+-
+-      cerr << "Error" << ": Failure decoding data in context [M].\n";
+-
+-      HandleAbort();
++      value = 0;
++      return 0;
++      //#ifdef PANIC
++      //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [M] "
++      //        << "in decodeValue() with index = 2.\n"
++      //        << logofs_flush;
++      //#endif
++      //cerr << "Error" << ": Failure decoding data in context [M].\n";
++      //HandleAbort();
+     }
+   }
+   else
+@@ -466,16 +527,22 @@
+ 
+     if (index > cache.getSize())
+     {
+-      #ifdef PANIC
+-      *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [N] "
+-              << "in decodeCachedValue() " << "index = " << index
+-              << " cache size = " << cache.getSize() << ".\n"
+-              << logofs_flush;
++      #ifdef WARNING
++      *logofs << "DecodeBuffer: Error [N] in decodeCachedValue(), returning 0:"
++              << " index = " << index
++              << " cache size = " << cache.getSize()
++              << ".\n" << logofs_flush;
+       #endif
+-
+-      cerr << "Error" << ": Failure decoding data in context [N].\n";
+-
+-      HandleAbort();
++      value = 0;
++      return 0;
++      //#ifdef PANIC
++      //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [N] "
++      //        << "in decodeCachedValue() " << "index = " << index
++      //        << " cache size = " << cache.getSize() << ".\n"
++      //        << logofs_flush;
++      //#endif
++      //cerr << "Error" << ": Failure decoding data in context [N].\n";
++      //HandleAbort();
+     }
+ 
+     value = cache.get(index);
+@@ -538,16 +605,22 @@
+   }
+   else if (end_ - nextSrc_ < (int) numBytes)
+   {
+-    #ifdef PANIC
+-    *logofs << "DecodeBuffer: PANIC! Assertion failed. Error [P] "
+-            << "in decodeMemory() " << "with length " << numBytes
++    #ifdef WARNING
++    *logofs << "DecodeBuffer: Error [P] in decodeMemory(), returning NULL:"
++            << " with length " << numBytes
+             << " and " << (end_ - nextSrc_)
+-            << " bytes remaining.\n" << logofs_flush;
++            << " bytes remaining"
++            << ".\n" << logofs_flush;
+     #endif
+-
+-    cerr << "Error" << ": Failure decoding data in context [P].\n";
+-
+-    HandleAbort();
++    return NULL;
++    //#ifdef PANIC
++    //*logofs << "DecodeBuffer: PANIC! Assertion failed. Error [P] "
++    //        << "in decodeMemory() " << "with length " << numBytes
++    //        << " and " << (end_ - nextSrc_)
++    //        << " bytes remaining.\n" << logofs_flush;
++    //#endif
++    //cerr << "Error" << ": Failure decoding data in context [P].\n";
++    //HandleAbort();
+   }
+ 
+   nextSrc_ += numBytes;
+--- a/nxcomp/DecodeBuffer.h
++++ b/nxcomp/DecodeBuffer.h
+@@ -30,7 +30,8 @@
+ #include "ActionCacheCompat.h"
+ #include "PositionCacheCompat.h"
+ 
+-#define DECODE_BUFFER_OVERFLOW_SIZE        4194304
++// See WriteBuffer.h and EncodeBuffer.h
++#define DECODE_BUFFER_OVERFLOW_SIZE        104857600
+ 
+ #define DECODE_BUFFER_POSTFIX_SIZE         1
+ 
+--- a/nxcomp/EncodeBuffer.h
++++ b/nxcomp/EncodeBuffer.h
+@@ -33,10 +33,10 @@
+ //
+ // This should match the maximum size of
+ // a single message added to write buffer
+-// (see WriteBuffer.h).
++// (see WriteBuffer.h and DecodeBuffer.h).
+ //
+ 
+-#define ENCODE_BUFFER_OVERFLOW_SIZE       4194304
++#define ENCODE_BUFFER_OVERFLOW_SIZE       104857600
+ 
+ //
+ // Adjust for the control messages and the
+--- a/nxcomp/SequenceQueue.h
++++ b/nxcomp/SequenceQueue.h
+@@ -18,6 +18,22 @@
+ #ifndef SequenceQueue_H
+ #define SequenceQueue_H
+ 
++inline int SequenceNumber_x_gt_y(unsigned int x, unsigned int y)
++{
++  // For two sequence numbers x and y, determine whether (x > y).
++  // Sequence numbers are the trailing 16 bits of a bigger number:
++  // need to handle wraparound, e.g. 0 is 65536, just after 65535.
++  if (x != (x & 0x00ffff)) return 0;
++  if (y != (y & 0x00ffff)) return 0;
++  // Closeness when comparison makes sense: arbitrarily set at 16*1024
++  if ((x > y) && ((x-y) < 16*1024)) return 1;
++  // Wrapped value
++  unsigned int w = x + 64*1024;
++  // We know that w>y but test left for symmetry
++  if ((w > y) && ((w-y) < 16*1024)) return 1;
++  return 0;
++}
++
+ //
+ // List of outstanding request messages which
+ // are waiting for a reply. This class is used
+--- a/nxcomp/ServerChannel.cpp
++++ b/nxcomp/ServerChannel.cpp
+@@ -104,7 +104,8 @@
+ //
+ 
+ #define HIDE_MIT_SHM_EXTENSION
+-#define HIDE_BIG_REQUESTS_EXTENSION
++// HIDE_BIG_REQUESTS_EXTENSION : No good to hide, some clients may send crap instead...
++#undef  HIDE_BIG_REQUESTS_EXTENSION
+ #define HIDE_XFree86_Bigfont_EXTENSION
+ #undef  HIDE_SHAPE_EXTENSION
+ #undef  HIDE_XKEYBOARD_EXTENSION
+@@ -1412,6 +1413,9 @@
+ 
+         unsigned int inputSequence = GetUINT(inputMessage + 2, bigEndian_);
+ 
++        // Sometimes we get inputSequence=0 or =256 when inputOpcode=11=X_UnmapSubwindows
++        // Seems weird... but is "normal" and is to be accepted.
++
+         //
+         // Check if this is an event which we can discard.
+         //
+@@ -1905,6 +1909,12 @@
+           break;
+         default:
+           {
++            // BEWARE: not only inputOpcode == GenericEvent but also
++            // others not handled above, at least:
++            //   GraphicsExpose    13
++            //   MapRequest        20
++            //   ConfigureRequest  23
++            // and any beyond LASTEvent.
+             #ifdef TEST
+             *logofs << "handleRead: Using generic event compression "
+                     << "for OPCODE#" << (unsigned int) inputOpcode
+@@ -1919,6 +1929,16 @@
+               encodeBuffer.encodeCachedValue(GetUINT(inputMessage + i * 2 + 4, bigEndian_),
+                                  16, *serverCache_ -> genericEventIntCache[i]);
+             }
++            // Handle "X Generic Event Extension"
++            // Cannot cache extra data...
++// FIXME: BUG ALERT: is it OK to have the first 32 bytes cached, but not the rest?
++            if (inputOpcode == GenericEvent && inputLength > 32)
++            {
++              for (unsigned int i = 14; i < ((inputLength-4)>>1); i++)
++              {
++                encodeBuffer.encodeValue(GetUINT(inputMessage + i * 2 + 4, bigEndian_), 16);
++              }
++            }
+           }
+ 
+         } // switch (inputOpcode)...
+@@ -3756,7 +3776,7 @@
+           }
+ 
+           unsigned int numPoints;
+-          decodeBuffer.decodeValue(numPoints, 16, 4);
++          decodeBuffer.decodeValue(numPoints, 32, 4);
+           outputLength = (numPoints << 2) + 12;
+           outputMessage = writeBuffer_.addMessage(outputLength);
+           unsigned int relativeCoordMode;
+@@ -3802,7 +3822,7 @@
+           }
+ 
+           unsigned int numPoints;
+-          decodeBuffer.decodeValue(numPoints, 16, 4);
++          decodeBuffer.decodeValue(numPoints, 32, 4);
+           outputLength = (numPoints << 2) + 12;
+           outputMessage = writeBuffer_.addMessage(outputLength);
+           unsigned int relativeCoordMode;
+@@ -3839,7 +3859,7 @@
+       case X_PolyRectangle:
+         {
+           unsigned int numRectangles;
+-          decodeBuffer.decodeValue(numRectangles, 16, 3);
++          decodeBuffer.decodeValue(numRectangles, 32, 3);
+           outputLength = (numRectangles << 3) + 12;
+           outputMessage = writeBuffer_.addMessage(outputLength);
+           decodeBuffer.decodeXidValue(value, clientCache_ -> drawableCache);
+@@ -3869,7 +3889,7 @@
+           }
+ 
+           unsigned int numSegments;
+-          decodeBuffer.decodeValue(numSegments, 16, 4);
++          decodeBuffer.decodeValue(numSegments, 32, 4);
+           outputLength = (numSegments << 3) + 12;
+           outputMessage = writeBuffer_.addMessage(outputLength);
+           decodeBuffer.decodeXidValue(value, clientCache_ -> drawableCache);
+@@ -4590,7 +4610,29 @@
+ 
+         *outputMessage = (unsigned char) outputOpcode;
+ 
+-        PutUINT(outputLength >> 2, outputMessage + 2, bigEndian_);
++        if (outputLength < 4*64*1024)
++          PutUINT(outputLength >> 2, outputMessage + 2, bigEndian_);
++        else
++        {
++          // Handle BIG-REQUESTS
++          PutUINT(0, outputMessage + 2, bigEndian_);
++// FIXME: BUG ALERT: following write may not work well,
++// particularly with un-flushed messages.
++if (outputMessage != writeBuffer_.getData())
++{
++*logofs << "PSz BUG handleWrite BIG-REQUESTS:"
++        << " have " << (unsigned int)(outputMessage - writeBuffer_.getData())
++        << " bytes in buffer"
++        << ", write immediate of 4-byte header will not work well"
++        << "\n" << logofs_flush;
++}
++// But, it works well enough in my testing...
++          // Write first four bytes
++          if (transport_ -> write(write_immediate, outputMessage, 4) < 0)
++              return -1;
++          // Replace with new 4-byte length
++          PutULONG(1 + (outputLength >> 2), outputMessage, bigEndian_);
++        }
+ 
+         #if defined(TEST) || defined(OPCODES)
+         *logofs << "handleWrite: Handled request OPCODE#"
+@@ -5912,7 +5954,7 @@
+   unsigned char opcode = *lastMotion_;
+   unsigned int size = 32;
+ 
+-  if (GetUINT(buffer + 2, bigEndian_) < serverSequence_)
++  if (SequenceNumber_x_gt_y(serverSequence_, GetUINT(buffer + 2, bigEndian_)))
+   {
+     PutUINT(serverSequence_, (unsigned char *) buffer + 2, bigEndian_);
+   }
+--- a/nxcomp/ServerReadBuffer.cpp
++++ b/nxcomp/ServerReadBuffer.cpp
+@@ -108,14 +108,21 @@
+     {
+       dataLength = 32 + (GetULONG(start + 4, bigEndian_) << 2);
+     }
++    else if (*start == GenericEvent && *(start+1) != 0)
++    {
++      // X Generic Event Extension
++      dataLength = 32 + (GetULONG(start + 4, bigEndian_) << 2);
++    }
+     else
+     {
+       dataLength = 32;
+     }
+ 
+-    if (dataLength < 32)
++// See WRITE_BUFFER_OVERFLOW_SIZE elsewhere
++// and also ENCODE_BUFFER_OVERFLOW_SIZE DECODE_BUFFER_OVERFLOW_SIZE.
++    if (dataLength < 32 || dataLength > 100*1024*1024)
+     {
+-      #ifdef TEST
++      #ifdef WARNING
+       *logofs << "ServerReadBuffer: WARNING! Assuming length 32 "
+               << "for suspicious message of length " << dataLength
+               << ".\n" << logofs_flush;
+--- a/nxcomp/WriteBuffer.h
++++ b/nxcomp/WriteBuffer.h
+@@ -32,8 +32,14 @@
+ // This is likely to be a reply to a X_ListFonts where
+ // user has a large amount of installed fonts.
+ //
++// Used also for messages sent, and should accommodate any BIG-REQUESTS.
++// Value was 4MB = 4194304, changed to 100MB = 104857600.
++// See also sanity check limits (set same, to 100*1024*1024) in
++// ClientReadBuffer.cpp ServerReadBuffer.cpp and ClientChannel.cpp, and
++// ENCODE_BUFFER_OVERFLOW_SIZE DECODE_BUFFER_OVERFLOW_SIZE elsewhere.
++//
+ 
+-#define WRITE_BUFFER_OVERFLOW_SIZE        4194304
++#define WRITE_BUFFER_OVERFLOW_SIZE        104857600
+ 
+ class WriteBuffer
+ {