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authorReinhard Tartler <siretart@tauware.de>2011-11-13 09:27:51 +0100
committerReinhard Tartler <siretart@tauware.de>2011-11-13 09:27:51 +0100
commit3e924126b56c4d421e8263d25f6b14aa4ceed047 (patch)
tree921403de7b834fb1ac89f97d84ce105e0b487051 /nxcomp/EncodeBuffer.h
parenta840692edc9c6d19cd7c057f68e39c7d95eb767d (diff)
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Imported nxcomp-3.1.0-4.tar.gznxcomp/3.1.0-4
Summary: Imported nxcomp-3.1.0-4.tar.gz Keywords: Imported nxcomp-3.1.0-4.tar.gz into Git repository
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+/**************************************************************************/
+/* */
+/* 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. */
+/* */
+/**************************************************************************/
+
+#ifndef EncodeBuffer_H
+#define EncodeBuffer_H
+
+#include "IntCache.h"
+#include "CharCache.h"
+#include "XidCache.h"
+#include "FreeCache.h"
+#include "OpcodeCache.h"
+#include "ActionCache.h"
+
+#include "ActionCacheCompat.h"
+#include "PositionCacheCompat.h"
+
+#define ENCODE_BUFFER_DEFAULT_SIZE 16384
+
+//
+// This should match the maximum size of
+// a single message added to write buffer
+// (see WriteBuffer.h).
+//
+
+#define ENCODE_BUFFER_OVERFLOW_SIZE 4194304
+
+//
+// Adjust for the control messages and the
+// frame length added by the proxy.
+//
+
+#define ENCODE_BUFFER_PREFIX_SIZE 64
+
+//
+// The encode routines may write one byte
+// past the nominal end of the encode buffer.
+// This additional byte is included in the
+// payload. This is actually a harmless bug.
+//
+
+#define ENCODE_BUFFER_POSTFIX_SIZE 1
+
+class EncodeBuffer
+{
+ public:
+
+ EncodeBuffer();
+
+ ~EncodeBuffer();
+
+ void setSize(unsigned int initialSize, unsigned int thresholdSize,
+ unsigned int maximumSize);
+
+ void encodeValue(unsigned int value, unsigned int numBits,
+ unsigned int blockSize = 0);
+
+ void encodeCachedValue(unsigned int value, unsigned int numBits,
+ IntCache &cache, unsigned int blockSize = 0);
+
+ void encodeCachedValue(unsigned char value, unsigned int numBits,
+ CharCache &cache, unsigned int blockSize = 0);
+
+ void encodeDiffCachedValue(const unsigned int value, unsigned int &previous,
+ unsigned int numBits, IntCache &cache,
+ unsigned int blockSize = 0)
+ {
+ encodeCachedValue((value - 1) - previous, numBits, cache, blockSize);
+
+ previous = value;
+ }
+
+ void encodeBoolValue(unsigned int value)
+ {
+ encodeValue(value, 1);
+ }
+
+ void encodeOpcodeValue(unsigned char value, OpcodeCache &cache)
+ {
+ encodeCachedValue(value, 8, cache.base_[cache.slot_], 8);
+
+ cache.slot_ = value;
+ }
+
+ void encodeActionValue(unsigned char value, ActionCache &cache)
+ {
+ unsigned short position = 0;
+
+ encodeActionValue(value, position, cache);
+ }
+
+ void encodeActionValue(unsigned char value, unsigned short position,
+ ActionCache &cache);
+
+ void encodeNewXidValue(unsigned int value, unsigned int &lastId,
+ IntCache &lastIdCache, IntCache &cache,
+ FreeCache &freeCache);
+
+ void encodeNewXidValue(unsigned int value, unsigned int &lastId,
+ IntCache &lastIdCache, XidCache &cache,
+ FreeCache &freeCache);
+
+ void encodeXidValue(unsigned int value, XidCache &cache);
+
+ void encodeFreeXidValue(unsigned int value, FreeCache &cache);
+
+ void encodeActionValueCompat(unsigned char value, ActionCacheCompat &cache)
+ {
+ encodeCachedValue(value, 2, cache.base_[cache.slot_]);
+
+ cache.slot_ = value;
+ }
+
+ void encodePositionValueCompat(short int value, PositionCacheCompat &cache);
+
+ void encodeTextData(const unsigned char *buffer, unsigned int numBytes)
+ {
+ encodeMemory(buffer, numBytes);
+ }
+
+ void encodeIntData(const unsigned char *buffer, unsigned int numBytes)
+ {
+ encodeMemory(buffer, numBytes);
+ }
+
+ void encodeLongData(const unsigned char *buffer, unsigned int numBytes)
+ {
+ encodeMemory(buffer, numBytes);
+ }
+
+ void encodeMemory(const unsigned char *buffer, unsigned int numBytes);
+
+ unsigned char *getData()
+ {
+ return buffer_;
+ }
+
+ unsigned int getLength() const;
+
+ unsigned int getBits() const
+ {
+ return ((nextDest_ - buffer_) << 3) + (7 - destShift_);
+ }
+
+ unsigned int diffBits();
+
+ void fullReset();
+
+ private:
+
+ void growBuffer(unsigned int numBytes = 0);
+
+ void alignBuffer();
+
+ unsigned int size_;
+ unsigned char *buffer_;
+
+ //
+ // This points to the first byte
+ // just beyond end of the buffer.
+ //
+
+ const unsigned char *end_;
+
+ unsigned char *nextDest_;
+ unsigned int destShift_;
+ unsigned int lastBits_;
+
+ unsigned int initialSize_;
+ unsigned int thresholdSize_;
+ unsigned int maximumSize_;
+};
+
+#endif /* EncodeBuffer_H */