DoomRTX/neo/engine/idlib/BitMsg.cpp

/*
===========================================================================

IceTech GPL Source Code
Copyright (C) 2026 Justin Marshall

This file is part of the IceTech GPL Source Code (?IceTech Source Code?).

IceTech Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

IceTech Source Code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with IceTech Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the IceTech Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the IceTech Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing Justin Marshall, justinmarshall20@gmail.com

===========================================================================
*/

#include "precompiled.h"
#pragma hdrstop


/*
==============================================================================

  idBitMsg

==============================================================================
*/

/*
================
idBitMsg::idBitMsg
================
*/
idBitMsg::idBitMsg() {
	writeData = NULL;
	readData = NULL;
	maxSize = 0;
	curSize = 0;
	writeBit = 0;
	readCount = 0;
	readBit = 0;
	allowOverflow = false;
	overflowed = false;
}

/*
================
idBitMsg::CheckOverflow
================
*/
bool idBitMsg::CheckOverflow(int numBits) {
	assert(numBits >= 0);
	if (numBits > GetRemainingWriteBits()) {
		if (!allowOverflow) {
#ifdef QUAKE4
			idLib::common->FatalError(va("idBitMsg: overflow without allowOverflow set: %d > %d*8", GetNumBitsWritten() + numBits, GetMaxSize()));
#else
			idLib::common->FatalError("idBitMsg: overflow without allowOverflow set");
#endif
		}
		if (numBits > (maxSize << 3)) {
			idLib::common->FatalError("idBitMsg: %i bits is > full message size", numBits);
		}
		idLib::common->Printf("idBitMsg: overflow\n");
		BeginWriting();
		overflowed = true;
		return true;
	}
	return false;
}

/*
================
idBitMsg::GetByteSpace
================
*/
byte* idBitMsg::GetByteSpace(int length) {
	byte* ptr;

	if (!writeData) {
		idLib::common->FatalError("idBitMsg::GetByteSpace: cannot write to message");
	}

	// round up to the next byte
	WriteByteAlign();

	// check for overflow
	CheckOverflow(length << 3);

	ptr = writeData + curSize;
	curSize += length;
	return ptr;
}

/*
================
idBitMsg::WriteBits

  If the number of bits is negative a sign is included.
================
*/
void idBitMsg::WriteBits(int value, int numBits) {
	int		put;
	int		fraction;

	if (!writeData) {
		idLib::common->Error("idBitMsg::WriteBits: cannot write to message");
	}

	// check if the number of bits is valid
	if (numBits == 0 || numBits < -31 || numBits > 32) {
		idLib::common->Error("idBitMsg::WriteBits: bad numBits %i", numBits);
	}

	// check for value overflows
	// this should be an error really, as it can go unnoticed and cause either bandwidth or corrupted data transmitted
	if (numBits != 32) {
		if (numBits > 0) {
			if (value > (1 << numBits) - 1) {
				idLib::common->Warning("idBitMsg::WriteBits: value overflow %d %d", value, numBits);
			}
			else if (value < 0) {
				idLib::common->Warning("idBitMsg::WriteBits: value overflow %d %d", value, numBits);
			}
		}
		else {
			int r = 1 << (-1 - numBits);
			if (value > r - 1) {
				idLib::common->Warning("idBitMsg::WriteBits: value overflow %d %d", value, numBits);
			}
			else if (value < -r) {
				idLib::common->Warning("idBitMsg::WriteBits: value overflow %d %d", value, numBits);
			}
		}
	}

	if (numBits < 0) {
		numBits = -numBits;
	}

	// check for msg overflow
	if (CheckOverflow(numBits)) {
		return;
	}

	// write the bits
	while (numBits) {
		if (writeBit == 0) {
			writeData[curSize] = 0;
			curSize++;
		}
		put = 8 - writeBit;
		if (put > numBits) {
			put = numBits;
		}
		fraction = value & ((1 << put) - 1);
		writeData[curSize - 1] |= fraction << writeBit;
		numBits -= put;
		value >>= put;
		writeBit = (writeBit + put) & 7;
	}
}

/*
================
idBitMsg::WriteString
================
*/
void idBitMsg::WriteString(const char* s, int maxLength, bool make7Bit) {
	if (!s) {
		WriteData("", 1);
	}
	else {
		int i, l;
		byte* dataPtr;
		const byte* bytePtr;

		l = idStr::Length(s);
		if (maxLength >= 0 && l >= maxLength) {
			l = maxLength - 1;
		}
		dataPtr = GetByteSpace(l + 1);
#ifdef QUAKE4
		// Quake 4 writes the string bytes as-is instead of forcing high-bit bytes to '.'.
		memcpy(dataPtr, s, l);
#else
		bytePtr = reinterpret_cast<const byte*>(s);
		if (make7Bit) {
			for (i = 0; i < l; i++) {
				if (bytePtr[i] > 127) {
					dataPtr[i] = '.';
				}
				else {
					dataPtr[i] = bytePtr[i];
				}
			}
		}
		else {
			for (i = 0; i < l; i++) {
				dataPtr[i] = bytePtr[i];
			}
		}
#endif
		dataPtr[l] = '\0';
	}
}

/*
================
idBitMsg::WriteData
================
*/
void idBitMsg::WriteData(const void* data, int length) {
	memcpy(GetByteSpace(length), data, length);
}

/*
================
idBitMsg::WriteNetadr
================
*/
void idBitMsg::WriteNetadr(const netadr_t adr) {
	byte* dataPtr;
	dataPtr = GetByteSpace(4);
	memcpy(dataPtr, adr.ip, 4);
	WriteUShort(adr.port);
}

/*
================
idBitMsg::WriteDelta
================
*/
void idBitMsg::WriteDelta(int oldValue, int newValue, int numBits) {
	if (oldValue == newValue) {
		WriteBits(0, 1);
		return;
	}
	WriteBits(1, 1);
	WriteBits(newValue, numBits);
}

/*
================
idBitMsg::WriteDeltaByteCounter
================
*/
void idBitMsg::WriteDeltaByteCounter(int oldValue, int newValue) {
	int i, x;

	x = oldValue ^ newValue;
	for (i = 7; i > 0; i--) {
		if (x & (1 << i)) {
			i++;
			break;
		}
	}
	WriteBits(i, 3);
	if (i) {
		WriteBits(((1 << i) - 1) & newValue, i);
	}
}

/*
================
idBitMsg::WriteDeltaShortCounter
================
*/
void idBitMsg::WriteDeltaShortCounter(int oldValue, int newValue) {
	int i, x;

	x = oldValue ^ newValue;
	for (i = 15; i > 0; i--) {
		if (x & (1 << i)) {
			i++;
			break;
		}
	}
	WriteBits(i, 4);
	if (i) {
		WriteBits(((1 << i) - 1) & newValue, i);
	}
}

/*
================
idBitMsg::WriteDeltaLongCounter
================
*/
void idBitMsg::WriteDeltaLongCounter(int oldValue, int newValue) {
	int i, x;

	x = oldValue ^ newValue;
	for (i = 31; i > 0; i--) {
		if (x & (1 << i)) {
			i++;
			break;
		}
	}
	WriteBits(i, 5);
	if (i) {
		WriteBits(((1 << i) - 1) & newValue, i);
	}
}

/*
==================
idBitMsg::WriteDeltaDict
==================
*/
bool idBitMsg::WriteDeltaDict(const idDict& dict, const idDict* base) {
	int i;
	const idKeyValue* kv, * basekv;
	bool changed = false;

	if (base != NULL) {

		for (i = 0; i < dict.GetNumKeyVals(); i++) {
			kv = dict.GetKeyVal(i);
			basekv = base->FindKey(kv->GetKey());
			if (basekv == NULL || basekv->GetValue()
#ifdef QUAKE4
				.Cmp(kv->GetValue())
#else
				.Icmp(kv->GetValue())
#endif
				!= 0) {
				WriteString(kv->GetKey());
				WriteString(kv->GetValue());
				changed = true;
			}
		}

		WriteString("");

		for (i = 0; i < base->GetNumKeyVals(); i++) {
			basekv = base->GetKeyVal(i);
			kv = dict.FindKey(basekv->GetKey());
			if (kv == NULL) {
				WriteString(basekv->GetKey());
				changed = true;
			}
		}

		WriteString("");

	}
	else {

		for (i = 0; i < dict.GetNumKeyVals(); i++) {
			kv = dict.GetKeyVal(i);
			WriteString(kv->GetKey());
			WriteString(kv->GetValue());
			changed = true;
		}
		WriteString("");

		WriteString("");

	}

	return changed;
}

/*
================
idBitMsg::ReadBits

  If the number of bits is negative a sign is included.
================
*/
int idBitMsg::ReadBits(int numBits) const {
	int		value;
	int		valueBits;
	int		get;
	int		fraction;
	bool	sgn;

	if (!readData) {
		idLib::common->FatalError("idBitMsg::ReadBits: cannot read from message");
	}

	// check if the number of bits is valid
	if (numBits == 0 || numBits < -31 || numBits > 32) {
		idLib::common->FatalError("idBitMsg::ReadBits: bad numBits %i", numBits);
	}

	value = 0;
	valueBits = 0;

	if (numBits < 0) {
		numBits = -numBits;
		sgn = true;
	}
	else {
		sgn = false;
	}

	// check for overflow
	if (numBits > GetRemainingReadBits()) {
		return -1;
	}

	while (valueBits < numBits) {
		if (readBit == 0) {
			readCount++;
		}
		get = 8 - readBit;
		if (get > (numBits - valueBits)) {
			get = numBits - valueBits;
		}
		fraction = readData[readCount - 1];
		fraction >>= readBit;
		fraction &= (1 << get) - 1;
		value |= fraction << valueBits;

		valueBits += get;
		readBit = (readBit + get) & 7;
	}

	if (sgn) {
		if (value & (1 << (numBits - 1))) {
			value |= -1 ^ ((1 << numBits) - 1);
		}
	}

	return value;
}

/*
================
idBitMsg::ReadString
================
*/
int idBitMsg::ReadString(char* buffer, int bufferSize) const {
	int	l, c;

	ReadByteAlign();
	l = 0;
	while (1) {
		c = ReadByte();
		if (c <= 0 || c >= 255) {
			break;
		}
		// translate all fmt spec to avoid crash bugs in string routines
		if (c == '%') {
			c = '.';
		}

		// we will read past any excessively long string, so
		// the following data can be read, but the string will
		// be truncated
		if (l < bufferSize - 1) {
			buffer[l] = c;
			l++;
		}
	}

	buffer[l] = 0;
	return l;
}

/*
================
idBitMsg::ReadData
================
*/
int idBitMsg::ReadData(void* data, int length) const {
	int cnt;

	ReadByteAlign();
	cnt = readCount;

	if (readCount + length > curSize) {
		if (data) {
#ifdef QUAKE4
			memcpy(data, readData + readCount, GetRemainingData());
#else
			memcpy(data, readData + readCount, GetRemaingData());
#endif
		}
		readCount = curSize;
	}
	else {
		if (data) {
			memcpy(data, readData + readCount, length);
		}
		readCount += length;
	}

	return (readCount - cnt);
}

/*
================
idBitMsg::ReadNetadr
================
*/
void idBitMsg::ReadNetadr(netadr_t* adr) const {
	int i;

	adr->type = NA_IP;
	for (i = 0; i < 4; i++) {
		adr->ip[i] = ReadByte();
	}
	adr->port = ReadUShort();
}

/*
================
idBitMsg::ReadDelta
================
*/
int idBitMsg::ReadDelta(int oldValue, int numBits) const {
	if (ReadBits(1)) {
		return ReadBits(numBits);
	}
	return oldValue;
}

/*
================
idBitMsg::ReadDeltaByteCounter
================
*/
int idBitMsg::ReadDeltaByteCounter(int oldValue) const {
	int i, newValue;

	i = ReadBits(3);
	if (!i) {
		return oldValue;
	}
	newValue = ReadBits(i);
	return (oldValue & ~((1 << i) - 1) | newValue);
}

/*
================
idBitMsg::ReadDeltaShortCounter
================
*/
int idBitMsg::ReadDeltaShortCounter(int oldValue) const {
	int i, newValue;

	i = ReadBits(4);
	if (!i) {
		return oldValue;
	}
	newValue = ReadBits(i);
	return (oldValue & ~((1 << i) - 1) | newValue);
}

/*
================
idBitMsg::ReadDeltaLongCounter
================
*/
int idBitMsg::ReadDeltaLongCounter(int oldValue) const {
	int i, newValue;

	i = ReadBits(5);
	if (!i) {
		return oldValue;
	}
	newValue = ReadBits(i);
	return (oldValue & ~((1 << i) - 1) | newValue);
}

/*
==================
idBitMsg::ReadDeltaDict
==================
*/
bool idBitMsg::ReadDeltaDict(idDict& dict, const idDict* base) const {
	char		key[MAX_STRING_CHARS];
	char		value[MAX_STRING_CHARS];
	bool		changed = false;

	if (base != NULL) {
		dict = *base;
	}
	else {
		dict.Clear();
	}

	while (ReadString(key, sizeof(key)) != 0) {
		ReadString(value, sizeof(value));
		dict.Set(key, value);
		changed = true;
	}

	while (ReadString(key, sizeof(key)) != 0) {
		dict.Delete(key);
		changed = true;
	}

	return changed;
}

/*
================
idBitMsg::DirToBits
================
*/
int idBitMsg::DirToBits(const idVec3& dir, int numBits) {
	int max, bits;
	float bias;

	assert(numBits >= 6 && numBits <= 32);
	assert(dir.LengthSqr() - 1.0f < 0.01f);

	numBits /= 3;
	max = (1 << (numBits - 1)) - 1;
	bias = 0.5f / max;

	bits = FLOATSIGNBITSET(dir.x) << (numBits * 3 - 1);
	bits |= (idMath::Ftoi((idMath::Fabs(dir.x) + bias) * max)) << (numBits * 2);
	bits |= FLOATSIGNBITSET(dir.y) << (numBits * 2 - 1);
	bits |= (idMath::Ftoi((idMath::Fabs(dir.y) + bias) * max)) << (numBits * 1);
	bits |= FLOATSIGNBITSET(dir.z) << (numBits * 1 - 1);
	bits |= (idMath::Ftoi((idMath::Fabs(dir.z) + bias) * max)) << (numBits * 0);
	return bits;
}

/*
================
idBitMsg::BitsToDir
================
*/
idVec3 idBitMsg::BitsToDir(int bits, int numBits) {
	static float sign[2] = { 1.0f, -1.0f };
	int max;
	float invMax;
	idVec3 dir;

	assert(numBits >= 6 && numBits <= 32);

	numBits /= 3;
	max = (1 << (numBits - 1)) - 1;
	invMax = 1.0f / max;

	dir.x = sign[(bits >> (numBits * 3 - 1)) & 1] * ((bits >> (numBits * 2)) & max) * invMax;
	dir.y = sign[(bits >> (numBits * 2 - 1)) & 1] * ((bits >> (numBits * 1)) & max) * invMax;
	dir.z = sign[(bits >> (numBits * 1 - 1)) & 1] * ((bits >> (numBits * 0)) & max) * invMax;
	dir.NormalizeFast();
	return dir;
}


/*
==============================================================================

  idBitMsgDelta

==============================================================================
*/

const int MAX_DATA_BUFFER = 1024;

/*
================
idBitMsgDelta::WriteBits
================
*/
void idBitMsgDelta::WriteBits(int value, int numBits) {
	if (newBase) {
		newBase->WriteBits(value, numBits);
	}

	if (!base) {
		writeDelta->WriteBits(value, numBits);
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(numBits);
		if (baseValue == value) {
			writeDelta->WriteBits(0, 1);
		}
		else {
			writeDelta->WriteBits(1, 1);
			writeDelta->WriteBits(value, numBits);
			changed = true;
		}
	}
}

/*
================
idBitMsgDelta::WriteDelta
================
*/
void idBitMsgDelta::WriteDelta(int oldValue, int newValue, int numBits) {
	if (newBase) {
		newBase->WriteBits(newValue, numBits);
	}

	if (!base) {
		if (oldValue == newValue) {
			writeDelta->WriteBits(0, 1);
		}
		else {
			writeDelta->WriteBits(1, 1);
			writeDelta->WriteBits(newValue, numBits);
		}
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(numBits);
		if (baseValue == newValue) {
			writeDelta->WriteBits(0, 1);
		}
		else {
			writeDelta->WriteBits(1, 1);
			if (oldValue == newValue) {
				writeDelta->WriteBits(0, 1);
				changed = true;
			}
			else {
				writeDelta->WriteBits(1, 1);
				writeDelta->WriteBits(newValue, numBits);
				changed = true;
			}
		}
	}
}

/*
================
idBitMsgDelta::ReadBits
================
*/
int idBitMsgDelta::ReadBits(int numBits) const {
	int value;

	if (!base) {
		value = readDelta->ReadBits(numBits);
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(numBits);
		if (!readDelta || readDelta->ReadBits(1) == 0) {
			value = baseValue;
		}
		else {
			value = readDelta->ReadBits(numBits);
			changed = true;
		}
	}

	if (newBase) {
		newBase->WriteBits(value, numBits);
	}
	return value;
}

/*
================
idBitMsgDelta::ReadDelta
================
*/
int idBitMsgDelta::ReadDelta(int oldValue, int numBits) const {
	int value;

	if (!base) {
		if (readDelta->ReadBits(1) == 0) {
			value = oldValue;
		}
		else {
			value = readDelta->ReadBits(numBits);
		}
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(numBits);
		if (!readDelta || readDelta->ReadBits(1) == 0) {
			value = baseValue;
		}
		else if (readDelta->ReadBits(1) == 0) {
			value = oldValue;
			changed = true;
		}
		else {
			value = readDelta->ReadBits(numBits);
			changed = true;
		}
	}

	if (newBase) {
		newBase->WriteBits(value, numBits);
	}
	return value;
}

/*
================
idBitMsgDelta::WriteString
================
*/
void idBitMsgDelta::WriteString(const char* s, int maxLength) {
	if (newBase) {
		newBase->WriteString(s, maxLength);
	}

	if (!base) {
		writeDelta->WriteString(s, maxLength);
		changed = true;
	}
	else {
		char baseString[MAX_DATA_BUFFER];
		base->ReadString(baseString, sizeof(baseString));
		if (idStr::Cmp(s, baseString) == 0) {
			writeDelta->WriteBits(0, 1);
		}
		else {
			writeDelta->WriteBits(1, 1);
			writeDelta->WriteString(s, maxLength);
			changed = true;
		}
	}
}

/*
================
idBitMsgDelta::WriteData
================
*/
void idBitMsgDelta::WriteData(const void* data, int length) {
	if (newBase) {
		newBase->WriteData(data, length);
	}

	if (!base) {
		writeDelta->WriteData(data, length);
		changed = true;
	}
	else {
		byte baseData[MAX_DATA_BUFFER];
		assert(length < sizeof(baseData));
		base->ReadData(baseData, length);
		if (memcmp(data, baseData, length) == 0) {
			writeDelta->WriteBits(0, 1);
		}
		else {
			writeDelta->WriteBits(1, 1);
			writeDelta->WriteData(data, length);
			changed = true;
		}
	}
}

/*
================
idBitMsgDelta::WriteDict
================
*/
void idBitMsgDelta::WriteDict(const idDict& dict) {
	if (newBase) {
		newBase->WriteDeltaDict(dict, NULL);
	}

	if (!base) {
		writeDelta->WriteDeltaDict(dict, NULL);
		changed = true;
	}
	else {
		idDict baseDict;
		base->ReadDeltaDict(baseDict, NULL);
		changed = writeDelta->WriteDeltaDict(dict, &baseDict);
	}
}

/*
================
idBitMsgDelta::WriteDeltaByteCounter
================
*/
void idBitMsgDelta::WriteDeltaByteCounter(int oldValue, int newValue) {
	if (newBase) {
		newBase->WriteBits(newValue, 8);
	}

	if (!base) {
		writeDelta->WriteDeltaByteCounter(oldValue, newValue);
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(8);
		if (baseValue == newValue) {
			writeDelta->WriteBits(0, 1);
		}
		else {
			writeDelta->WriteBits(1, 1);
			writeDelta->WriteDeltaByteCounter(oldValue, newValue);
			changed = true;
		}
	}
}

/*
================
idBitMsgDelta::WriteDeltaShortCounter
================
*/
void idBitMsgDelta::WriteDeltaShortCounter(int oldValue, int newValue) {
	if (newBase) {
		newBase->WriteBits(newValue, 16);
	}

	if (!base) {
		writeDelta->WriteDeltaShortCounter(oldValue, newValue);
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(16);
		if (baseValue == newValue) {
			writeDelta->WriteBits(0, 1);
		}
		else {
			writeDelta->WriteBits(1, 1);
			writeDelta->WriteDeltaShortCounter(oldValue, newValue);
			changed = true;
		}
	}
}

/*
================
idBitMsgDelta::WriteDeltaLongCounter
================
*/
void idBitMsgDelta::WriteDeltaLongCounter(int oldValue, int newValue) {
	if (newBase) {
		newBase->WriteBits(newValue, 32);
	}

	if (!base) {
		writeDelta->WriteDeltaLongCounter(oldValue, newValue);
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(32);
		if (baseValue == newValue) {
			writeDelta->WriteBits(0, 1);
		}
		else {
			writeDelta->WriteBits(1, 1);
			writeDelta->WriteDeltaLongCounter(oldValue, newValue);
			changed = true;
		}
	}
}

/*
================
idBitMsgDelta::ReadString
================
*/
void idBitMsgDelta::ReadString(char* buffer, int bufferSize) const {
	if (!base) {
		readDelta->ReadString(buffer, bufferSize);
		changed = true;
	}
	else {
		char baseString[MAX_DATA_BUFFER];
		base->ReadString(baseString, sizeof(baseString));
		if (!readDelta || readDelta->ReadBits(1) == 0) {
			idStr::Copynz(buffer, baseString, bufferSize);
		}
		else {
			readDelta->ReadString(buffer, bufferSize);
			changed = true;
		}
	}

	if (newBase) {
		newBase->WriteString(buffer);
	}
}

/*
================
idBitMsgDelta::ReadData
================
*/
void idBitMsgDelta::ReadData(void* data, int length) const {
	if (!base) {
		readDelta->ReadData(data, length);
		changed = true;
	}
	else {
		char baseData[MAX_DATA_BUFFER];
		assert(length < sizeof(baseData));
		base->ReadData(baseData, length);
		if (!readDelta || readDelta->ReadBits(1) == 0) {
			memcpy(data, baseData, length);
		}
		else {
			readDelta->ReadData(data, length);
			changed = true;
		}
	}

	if (newBase) {
		newBase->WriteData(data, length);
	}
}

/*
================
idBitMsgDelta::ReadDict
================
*/
void idBitMsgDelta::ReadDict(idDict& dict) {
	if (!base) {
		readDelta->ReadDeltaDict(dict, NULL);
		changed = true;
	}
	else {
		idDict baseDict;
		base->ReadDeltaDict(baseDict, NULL);
		if (!readDelta) {
			dict = baseDict;
		}
		else {
			changed = readDelta->ReadDeltaDict(dict, &baseDict);
		}
	}

	if (newBase) {
		newBase->WriteDeltaDict(dict, NULL);
	}
}

/*
================
idBitMsgDelta::ReadDeltaByteCounter
================
*/
int idBitMsgDelta::ReadDeltaByteCounter(int oldValue) const {
	int value;

	if (!base) {
		value = readDelta->ReadDeltaByteCounter(oldValue);
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(8);
		if (!readDelta || readDelta->ReadBits(1) == 0) {
			value = baseValue;
		}
		else {
			value = readDelta->ReadDeltaByteCounter(oldValue);
			changed = true;
		}
	}

	if (newBase) {
		newBase->WriteBits(value, 8);
	}
	return value;
}

/*
================
idBitMsgDelta::ReadDeltaShortCounter
================
*/
int idBitMsgDelta::ReadDeltaShortCounter(int oldValue) const {
	int value;

	if (!base) {
		value = readDelta->ReadDeltaShortCounter(oldValue);
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(16);
		if (!readDelta || readDelta->ReadBits(1) == 0) {
			value = baseValue;
		}
		else {
			value = readDelta->ReadDeltaShortCounter(oldValue);
			changed = true;
		}
	}

	if (newBase) {
		newBase->WriteBits(value, 16);
	}
	return value;
}

/*
================
idBitMsgDelta::ReadDeltaLongCounter
================
*/
int idBitMsgDelta::ReadDeltaLongCounter(int oldValue) const {
	int value;

	if (!base) {
		value = readDelta->ReadDeltaLongCounter(oldValue);
		changed = true;
	}
	else {
		int baseValue = base->ReadBits(32);
		if (!readDelta || readDelta->ReadBits(1) == 0) {
			value = baseValue;
		}
		else {
			value = readDelta->ReadDeltaLongCounter(oldValue);
			changed = true;
		}
	}

	if (newBase) {
		newBase->WriteBits(value, 32);
	}
	return value;
}

#ifdef QUAKE4
/*
===========================================================================
idMsgQueue
===========================================================================
*/

/*
===============
idMsgQueue::idMsgQueue
===============
*/
idMsgQueue::idMsgQueue(void) {
	Init(0);
}

/*
===============
idMsgQueue::Init
===============
*/
void idMsgQueue::Init(int sequence) {
	first = last = sequence;
	startIndex = endIndex = 0;
}

/*
===============
idMsgQueue::Add
===============
*/
bool idMsgQueue::Add(const byte* data, const int size, bool sequencing) {
	if (GetSpaceLeft() < size + 8) {
		return false;
	}

	assert(size);

	WriteUShort(size);
	if (sequencing) {
		WriteLong(last);
	}
	last++;
	WriteData(data, size);
	return true;
}

/*
===============
idMsgQueue::AddConcat
===============
*/
bool idMsgQueue::AddConcat(const byte* data1, const int size1, const byte* data2, const int size2, bool sequencing) {
	if (GetSpaceLeft() < size1 + size2 + 8) {
		return false;
	}

	assert(size1 && size2);

	WriteUShort(size1 + size2);
	if (sequencing) {
		WriteLong(last);
	}
	last++;
	WriteData(data1, size1);
	WriteData(data2, size2);
	return true;
}

/*
===============
idMsgQueue::Get
===============
*/
bool idMsgQueue::Get(byte* data, int dataSize, int& size, bool sequencing) {
	if (sequencing ? (first == last) : (startIndex == endIndex)) {
		size = 0;
		return false;
	}
	int sequence;
	size = ReadUShort();
	if (data && size > dataSize) {
		common->Error("idMsgQueue::Get  buffer size of %d < get size of %d", dataSize, size);
	}

	if (sequencing) {
		sequence = ReadLong();
		assert(sequence == first);
	}
	ReadData(data, size);
	first++;
	return true;
}

/*
===============
idMsgQueue::GetTotalSize
===============
*/
int idMsgQueue::GetTotalSize(void) const {
	if (startIndex <= endIndex) {
		return (endIndex - startIndex);
	}
	else {
		return (sizeof(buffer) - startIndex + endIndex);
	}
}

/*
===============
idMsgQueue::GetSpaceLeft
===============
*/
int idMsgQueue::GetSpaceLeft(void) const {
	if (startIndex <= endIndex) {
		return sizeof(buffer) - (endIndex - startIndex) - 1;
	}
	else {
		return (startIndex - endIndex) - 1;
	}
}

/*
===============
idMsgQueue::CopyToBuffer
===============
*/
void idMsgQueue::CopyToBuffer(byte* buf) const {
	if (startIndex <= endIndex) {
		// RAVEN BEGIN
		// JSinger: Changed to call optimized memcpy
		SIMDProcessor->Memcpy(buf, buffer + startIndex, endIndex - startIndex);
		// RAVEN END
	}
	else {
		// RAVEN BEGIN
		// JSinger: Changed to call optimized memcpy
		SIMDProcessor->Memcpy(buf, buffer + startIndex, sizeof(buffer) - startIndex);
		SIMDProcessor->Memcpy(buf + sizeof(buffer) - startIndex, buffer, endIndex);
		// RAVEN END
	}
}

/*
===============
idMsgQueue::WriteByte
===============
*/
void idMsgQueue::WriteByte(byte b) {
	buffer[endIndex] = b;
	endIndex = (endIndex + 1) & (MAX_MSG_QUEUE_SIZE - 1);
}

/*
===============
idMsgQueue::ReadByte
===============
*/
byte idMsgQueue::ReadByte(void) {
	byte b = buffer[startIndex];
	startIndex = (startIndex + 1) & (MAX_MSG_QUEUE_SIZE - 1);
	return b;
}

/*
===============
idMsgQueue::WriteShort
===============
*/
void idMsgQueue::WriteShort(int s) {
	WriteByte((s >> 0) & 255);
	WriteByte((s >> 8) & 255);
}

/*
===============
idMsgQueue::WriteUShort
===============
*/
void idMsgQueue::WriteUShort(int s) {
	WriteByte((s >> 0) & 255);
	WriteByte((s >> 8) & 255);
}

/*
===============
idMsgQueue::ReadShort
===============
*/
int idMsgQueue::ReadShort(void) {
	// RAVEN BEGIN
	// ddynerman: removed side-effecting bitwise or
	byte l = ReadByte();
	byte h = ReadByte();
	return (short)(l | (h << 8)); // sign extend
	// RAVEN LOW
}

/*
===============
idMsgQueue::ReadUShort
===============
*/
int idMsgQueue::ReadUShort(void) {
	// RAVEN BEGIN
	// ddynerman: removed side-effecting bitwise or
	byte l = ReadByte();
	byte h = ReadByte();
	return l | (h << 8);
	// RAVEN LOW
}

/*
===============
idMsgQueue::WriteLong
===============
*/
void idMsgQueue::WriteLong(int l) {
	WriteByte((l >> 0) & 255);
	WriteByte((l >> 8) & 255);
	WriteByte((l >> 16) & 255);
	WriteByte((l >> 24) & 255);
}

/*
===============
idMsgQueue::ReadLong
===============
*/
int idMsgQueue::ReadLong(void) {
	// RAVEN BEGIN
	// ddynerman: removed side-effecting bitwise or
	byte ll = ReadByte();
	byte lh = ReadByte();
	byte hl = ReadByte();
	byte hh = ReadByte();
	return ll | (lh << 8) | (hl << 16) | (hh << 24);
	// RAVEN END
}

/*
===============
idMsgQueue::WriteData
===============
*/
void idMsgQueue::WriteData(const byte* data, const int size) {
	for (int i = 0; i < size; i++) {
		WriteByte(data[i]);
	}
}

/*
===============
idMsgQueue::ReadData
===============
*/
void idMsgQueue::ReadData(byte* data, const int size) {
	if (data) {
		for (int i = 0; i < size; i++) {
			data[i] = ReadByte();
		}
	}
	else {
		for (int i = 0; i < size; i++) {
			ReadByte();
		}
	}
}

/*
===============
idMsgQueue::WriteTo
===============
*/
void idMsgQueue::WriteTo(idBitMsg& msg) {
	msg.WriteUShort(GetTotalSize());
	assert(startIndex == 0);
	msg.WriteData(buffer + startIndex, endIndex - startIndex);
}

/*
===============
idMsgQueue::FlushTo
===============
*/
void idMsgQueue::FlushTo(idBitMsg& msg) {
	WriteTo(msg);
	Init(0);
}

/*
===============
idMsgQueue::ReadFrom
===============
*/
void idMsgQueue::ReadFrom(const idBitMsg& msg) {
	Init(0);
	endIndex = msg.ReadUShort();
	msg.ReadData(buffer, endIndex);
}

/*
===============
idMsgQueue::Save
===============
*/
void idMsgQueue::Save(idFile* file) const {
	file->WriteInt(first);
	file->WriteInt(last);
	file->WriteInt(startIndex);
	file->WriteInt(endIndex);
	file->Write(buffer + startIndex, endIndex - startIndex);
}
/*
===============
idMsgQueue::Restore
===============
*/
void idMsgQueue::Restore(idFile* file) {
	file->ReadInt(first);
	file->ReadInt(last);
	file->ReadInt(startIndex);
	file->ReadInt(endIndex);
	file->Read(buffer + startIndex, endIndex - startIndex);
}

/*
===============
idBitMsgQueue::idBitMsgQueue
===============
*/
idBitMsgQueue::idBitMsgQueue(void) {
	Init();
}

/*
===============
idBitMsgQueue::Init
===============
*/
void idBitMsgQueue::Init(void) {
	readTimestamp = false;
	writeList.Clear();
	readList.Clear();
}

/*
===============
idBitMsgQueue::Add
===============
*/
void idBitMsgQueue::Add(const idBitMsg& msg, const int timestamp) {
	while (writeList.NextNode() && writeList.Next()->GetSpaceLeft() < (msg.GetSize() + 8 + 4)) {
		writeList.NextNode()->AddToEnd(readList);
	}

	if (!writeList.NextNode()) {
		idLinkList< idMsgQueue >* node = new idLinkList< idMsgQueue >;
		node->SetOwner(new idMsgQueue);
		node->AddToEnd(writeList);
	}

	writeList.Next()->WriteLong(timestamp);
	if (!writeList.Next()->Add(msg.GetData(), msg.GetSize(), false)) {
		assert(false);
	}
}

/*
===============
idBitMsgQueue::Get
===============
*/
bool idBitMsgQueue::Get(idBitMsg& msg, int& timestamp) {
	while (readList.NextNode() && !readList.Next()->GetTotalSize()) {
		readList.Next()->Init(0);
		readList.NextNode()->AddToEnd(writeList);
	}

	if (readList.NextNode()) {
		int size;

		timestamp = readTimestamp ? nextTimestamp : readList.Next()->ReadLong();
		readTimestamp = true;
		if (readList.Next()->Get(msg.GetData(), msg.GetMaxSize(), size, false)) {
			msg.SetSize(size);
			msg.BeginReading();
			readTimestamp = false;
			return true;
		}

		assert(false);
	}
	else if (writeList.NextNode() && writeList.Next()->GetTotalSize()) {
		int size;

		timestamp = readTimestamp ? nextTimestamp : writeList.Next()->ReadLong();
		readTimestamp = true;
		if (writeList.Next()->Get(msg.GetData(), msg.GetMaxSize(), size, false)) {
			msg.SetSize(size);
			msg.BeginReading();
			readTimestamp = false;
			return true;
		}

		assert(false);
	}

	msg.SetSize(0);
	return false;
}

/*
===============
idBitMsgQueue::GetTimestamp
===============
*/
bool idBitMsgQueue::GetTimestamp(int& timestamp) {
	if (readTimestamp) {
		timestamp = nextTimestamp;
		return true;
	}

	while (readList.NextNode() && !readList.Next()->GetTotalSize()) {
		readList.Next()->Init(0);
		readList.NextNode()->AddToEnd(writeList);
	}

	if (readList.NextNode()) {
		timestamp = nextTimestamp = readList.Next()->ReadLong();
		readTimestamp = true;
		return true;
	}
	else if (writeList.NextNode() && writeList.Next()->GetTotalSize()) {
		timestamp = nextTimestamp = writeList.Next()->ReadLong();
		readTimestamp = true;
		return true;
	}

	return false;
}
#endif