From 3e924126b56c4d421e8263d25f6b14aa4ceed047 Mon Sep 17 00:00:00 2001
From: Reinhard Tartler <siretart@tauware.de>
Date: Sun, 13 Nov 2011 09:27:51 +0100
Subject: Imported nxcomp-3.1.0-4.tar.gz

Summary: Imported nxcomp-3.1.0-4.tar.gz
Keywords:

Imported nxcomp-3.1.0-4.tar.gz
into Git repository
---
 nxcomp/ProxyReadBuffer.cpp | 199 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 199 insertions(+)
 create mode 100755 nxcomp/ProxyReadBuffer.cpp

(limited to 'nxcomp/ProxyReadBuffer.cpp')

diff --git a/nxcomp/ProxyReadBuffer.cpp b/nxcomp/ProxyReadBuffer.cpp
new file mode 100755
index 000000000..3c3167e6c
--- /dev/null
+++ b/nxcomp/ProxyReadBuffer.cpp
@@ -0,0 +1,199 @@
+/**************************************************************************/
+/*                                                                        */
+/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/.         */
+/*                                                                        */
+/* NXCOMP, 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 rights reserved.                                                   */
+/*                                                                        */
+/**************************************************************************/
+
+#include "ProxyReadBuffer.h"
+
+#include "Transport.h"
+
+//
+// Set the verbosity level. You also
+// need to define DUMP in Misc.cpp
+// if DUMP is defined here.
+//
+
+#define WARNING
+#define PANIC
+#undef  TEST
+#undef  DEBUG
+#undef  DUMP
+
+unsigned int ProxyReadBuffer::suggestedLength(unsigned int pendingLength)
+{
+  //
+  // Always read all the data that
+  // is available.
+  //
+
+  int readable = transport_ -> readable();
+
+  unsigned int readLength = (readable == -1 ? 0 : (unsigned int) readable);
+
+  if (readLength < pendingLength)
+  {
+    readLength = pendingLength;
+  }
+
+  //
+  // Even if the readable data is not
+  // enough to make a complete message,
+  // resize the buffer to accomodate
+  // it all.
+  //
+
+  if (pendingLength < remaining_)
+  {
+    readLength = remaining_;
+  }
+
+  return readLength;
+}  
+
+int ProxyReadBuffer::locateMessage(const unsigned char *start,
+                                       const unsigned char *end,
+                                           unsigned int &controlLength,
+                                               unsigned int &dataLength,
+                                                   unsigned int &trailerLength)
+{
+  unsigned int lengthLength = 0;
+  const unsigned char *nextSrc = start;
+  unsigned char next;
+
+  dataLength = 0;
+
+  #ifdef TEST
+  *logofs << "ProxyReadBuffer: Locating message for FD#"
+          << transport_ -> fd() << " with " << end - start
+          << " bytes.\n" << logofs_flush;
+  #endif
+
+  //
+  // Use something like the following if
+  // you are looking for errors.
+  //
+
+  #ifdef DUMP
+  if (control -> ProxyMode == proxy_server && start < end &&
+          transport_ -> fd() == 6 || transport_ -> fd() == 11)
+  {
+    *logofs << "ProxyReadBuffer: Partial checksums are:\n";
+
+    DumpBlockChecksums(start, end - start, 256);
+
+    *logofs << logofs_flush;
+  }
+  #endif
+
+  do
+  {
+    if (nextSrc >= end)
+    {
+      remaining_ = 1;
+
+      #ifdef TEST
+      *logofs << "ProxyReadBuffer: No message was located "
+              << "with remaining " << remaining_ << ".\n"
+              << logofs_flush;
+      #endif
+
+      return 0;
+    }
+
+    next = *nextSrc++;
+
+    dataLength <<= 7;
+    dataLength |= (unsigned int) (next & 0x7f);
+
+    lengthLength++;
+  }
+  while (next & 0x80);
+
+  unsigned int totalLength;
+
+  if (dataLength == 0)
+  {
+    trailerLength = 0;
+    controlLength = 3;
+    totalLength   = controlLength;
+  }
+  else
+  {
+    trailerLength = lengthLength;
+    controlLength = 0;
+    totalLength   = dataLength + trailerLength;
+  }
+
+  if (start + totalLength > end)
+  {
+    //
+    // When having to decompress a ZLIB stream,
+    // a single byte can be enough to complete
+    // the frame.
+    //
+
+    if (control -> RemoteStreamCompression == 0)
+    {
+      remaining_ = totalLength - (end - start);
+    }
+    else
+    {
+      remaining_ = 1;
+    }
+
+    #ifdef TEST
+    *logofs << "ProxyReadBuffer: No message was located "
+            << "with remaining " << remaining_ << ".\n"
+            << logofs_flush;
+    #endif
+
+    return 0;
+  }
+  else
+  {
+    #ifdef DUMP
+    *logofs << "ProxyReadBuffer: Received " << totalLength << " bytes of data "
+            << "with checksum ";
+
+    DumpChecksum(start, totalLength);
+
+    *logofs << " on proxy FD#" << transport_ -> fd() << ".\n" << logofs_flush;
+    #endif
+
+    #if defined(TEST) || defined(INFO)
+    *logofs << "ProxyReadBuffer: Produced plain input for " << dataLength 
+            << "+" << trailerLength << "+" << controlLength << " bytes out of " 
+            << totalLength << " bytes.\n" << logofs_flush;
+    #endif
+
+    #ifdef DUMP
+    *logofs << "ProxyReadBuffer: Partial checksums are:\n";
+
+    DumpBlockChecksums(start, totalLength, 256);
+
+    *logofs << logofs_flush;
+    #endif
+
+    remaining_ = 0;
+
+    #ifdef TEST
+    *logofs << "ProxyReadBuffer: Located message with "
+            << "remaining " << remaining_ << ".\n"
+            << logofs_flush;
+    #endif
+
+    return 1;
+  }
+}
-- 
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