mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-12-14 22:41:49 +00:00
595 lines
12 KiB
C++
595 lines
12 KiB
C++
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition 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 Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#pragma hdrstop
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#include "precompiled.h"
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/*
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================================================================================================
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idBitMsg
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================================================================================================
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*/
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/*
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========================
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idBitMsg::CheckOverflow
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========================
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*/
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bool idBitMsg::CheckOverflow( int numBits )
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{
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if( numBits > GetRemainingWriteBits() )
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{
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if( !allowOverflow )
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{
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idLib::FatalError( "idBitMsg: overflow without allowOverflow set; maxsize=%i size=%i numBits=%i numRemainingWriteBits=%i",
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GetMaxSize(), GetSize(), numBits, GetRemainingWriteBits() );
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}
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if( numBits > ( maxSize << 3 ) )
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{
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idLib::FatalError( "idBitMsg: %i bits is > full message size", numBits );
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}
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idLib::Printf( "idBitMsg: overflow\n" );
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BeginWriting();
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overflowed = true;
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return true;
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}
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return false;
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}
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/*
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========================
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idBitMsg::GetByteSpace
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========================
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*/
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byte* idBitMsg::GetByteSpace( int length )
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{
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byte* ptr;
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if( !writeData )
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{
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idLib::FatalError( "idBitMsg::GetByteSpace: cannot write to message" );
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}
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// round up to the next byte
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WriteByteAlign();
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// check for overflow
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CheckOverflow( length << 3 );
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ptr = writeData + curSize;
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curSize += length;
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return ptr;
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}
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#define NBM( x ) (uint64)( ( 1LL << x ) - 1 )
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static uint64 maskForNumBits64[33] = { NBM( 0x00 ), NBM( 0x01 ), NBM( 0x02 ), NBM( 0x03 ),
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NBM( 0x04 ), NBM( 0x05 ), NBM( 0x06 ), NBM( 0x07 ),
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NBM( 0x08 ), NBM( 0x09 ), NBM( 0x0A ), NBM( 0x0B ),
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NBM( 0x0C ), NBM( 0x0D ), NBM( 0x0E ), NBM( 0x0F ),
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NBM( 0x10 ), NBM( 0x11 ), NBM( 0x12 ), NBM( 0x13 ),
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NBM( 0x14 ), NBM( 0x15 ), NBM( 0x16 ), NBM( 0x17 ),
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NBM( 0x18 ), NBM( 0x19 ), NBM( 0x1A ), NBM( 0x1B ),
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NBM( 0x1C ), NBM( 0x1D ), NBM( 0x1E ), NBM( 0x1F ), 0xFFFFFFFF
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};
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/*
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========================
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idBitMsg::WriteBits
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If the number of bits is negative a sign is included.
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========================
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*/
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void idBitMsg::WriteBits( int value, int numBits )
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{
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if( !writeData )
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{
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idLib::FatalError( "idBitMsg::WriteBits: cannot write to message" );
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}
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// check if the number of bits is valid
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if( numBits == 0 || numBits < -31 || numBits > 32 )
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{
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idLib::FatalError( "idBitMsg::WriteBits: bad numBits %i", numBits );
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}
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// check for value overflows
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if( numBits != 32 )
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{
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if( numBits > 0 )
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{
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if( value > ( 1 << numBits ) - 1 )
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{
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idLib::FatalError( "idBitMsg::WriteBits: value overflow %d %d",
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value, numBits );
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}
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else if( value < 0 )
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{
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idLib::FatalError( "idBitMsg::WriteBits: value overflow %d %d",
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value, numBits );
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}
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}
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else
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{
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const unsigned shift = ( -1 - numBits );
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int r = 1 << shift;
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if( value > r - 1 )
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{
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idLib::FatalError( "idBitMsg::WriteBits: value overflow %d %d",
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value, numBits );
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}
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else if( value < -r )
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{
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idLib::FatalError( "idBitMsg::WriteBits: value overflow %d %d",
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value, numBits );
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}
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}
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}
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if( numBits < 0 )
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{
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numBits = -numBits;
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}
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// check for msg overflow
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if( CheckOverflow( numBits ) )
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{
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return;
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}
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// Merge value with possible previous leftover
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tempValue |= ( ( ( int64 )value ) & maskForNumBits64[numBits] ) << writeBit;
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writeBit += numBits;
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// Flush 8 bits (1 byte) at a time
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while( writeBit >= 8 )
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{
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writeData[curSize++] = tempValue & 255;
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tempValue >>= 8;
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writeBit -= 8;
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}
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// Write leftover now, in case this is the last WriteBits call
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if( writeBit > 0 )
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{
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writeData[curSize] = tempValue & 255;
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}
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}
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/*
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========================
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idBitMsg::WriteString
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========================
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*/
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void idBitMsg::WriteString( const char* s, int maxLength, bool make7Bit )
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{
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if( !s )
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{
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WriteData( "", 1 );
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}
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else
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{
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int i, l;
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byte* dataPtr;
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const byte* bytePtr;
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l = idStr::Length( s );
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if( maxLength >= 0 && l >= maxLength )
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{
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l = maxLength - 1;
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}
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dataPtr = GetByteSpace( l + 1 );
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bytePtr = reinterpret_cast< const byte* >( s );
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if( make7Bit )
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{
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for( i = 0; i < l; i++ )
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{
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if( bytePtr[i] > 127 )
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{
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dataPtr[i] = '.';
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}
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else
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{
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dataPtr[i] = bytePtr[i];
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}
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}
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}
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else
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{
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for( i = 0; i < l; i++ )
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{
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dataPtr[i] = bytePtr[i];
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}
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}
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dataPtr[i] = '\0';
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}
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}
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/*
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========================
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idBitMsg::WriteData
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========================
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*/
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void idBitMsg::WriteData( const void* data, int length )
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{
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memcpy( GetByteSpace( length ), data, length );
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}
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/*
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========================
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idBitMsg::WriteNetadr
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========================
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*/
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void idBitMsg::WriteNetadr( const netadr_t adr )
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{
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WriteData( adr.ip, 4 );
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WriteUShort( adr.port );
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WriteByte( adr.type );
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}
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/*
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========================
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idBitMsg::WriteDeltaDict
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========================
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*/
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bool idBitMsg::WriteDeltaDict( const idDict& dict, const idDict* base )
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{
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int i;
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const idKeyValue* kv, *basekv;
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bool changed = false;
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if( base != NULL )
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{
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for( i = 0; i < dict.GetNumKeyVals(); i++ )
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{
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kv = dict.GetKeyVal( i );
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basekv = base->FindKey( kv->GetKey() );
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if( basekv == NULL || basekv->GetValue().Icmp( kv->GetValue() ) != 0 )
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{
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WriteString( kv->GetKey() );
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WriteString( kv->GetValue() );
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changed = true;
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}
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}
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WriteString( "" );
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for( i = 0; i < base->GetNumKeyVals(); i++ )
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{
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basekv = base->GetKeyVal( i );
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kv = dict.FindKey( basekv->GetKey() );
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if( kv == NULL )
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{
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WriteString( basekv->GetKey() );
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changed = true;
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}
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}
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WriteString( "" );
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}
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else
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{
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for( i = 0; i < dict.GetNumKeyVals(); i++ )
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{
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kv = dict.GetKeyVal( i );
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WriteString( kv->GetKey() );
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WriteString( kv->GetValue() );
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changed = true;
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}
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WriteString( "" );
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WriteString( "" );
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}
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return changed;
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}
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/*
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========================
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idBitMsg::ReadBits
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If the number of bits is negative a sign is included.
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========================
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*/
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int idBitMsg::ReadBits( int numBits ) const
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{
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int value;
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int valueBits;
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int get;
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int fraction;
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bool sgn;
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if( !readData )
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{
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idLib::FatalError( "idBitMsg::ReadBits: cannot read from message" );
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}
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// check if the number of bits is valid
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if( numBits == 0 || numBits < -31 || numBits > 32 )
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{
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idLib::FatalError( "idBitMsg::ReadBits: bad numBits %i", numBits );
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}
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value = 0;
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valueBits = 0;
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if( numBits < 0 )
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{
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numBits = -numBits;
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sgn = true;
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}
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else
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{
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sgn = false;
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}
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// check for overflow
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if( numBits > GetRemainingReadBits() )
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{
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return -1;
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}
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while( valueBits < numBits )
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{
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if( readBit == 0 )
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{
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readCount++;
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}
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get = 8 - readBit;
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if( get > ( numBits - valueBits ) )
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{
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get = ( numBits - valueBits );
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}
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fraction = readData[readCount - 1];
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fraction >>= readBit;
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// this doesn't really do anything: the bits set to 0 here are already shifted to 0
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fraction &= ( 1 << get ) - 1;
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value |= fraction << valueBits;
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valueBits += get;
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readBit = ( readBit + get ) & 7;
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}
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if( sgn )
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{
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if( value & ( 1 << ( numBits - 1 ) ) )
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{
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value |= -1 ^ ( ( 1 << numBits ) - 1 );
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}
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}
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return value;
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}
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/*
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========================
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idBitMsg::ReadString
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========================
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*/
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int idBitMsg::ReadString( char* buffer, int bufferSize ) const
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{
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int l, c;
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ReadByteAlign();
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l = 0;
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while( 1 )
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{
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c = ReadByte();
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if( c <= 0 || c >= 255 )
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{
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break;
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}
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// translate all fmt spec to avoid crash bugs in string routines
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if( c == '%' )
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{
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c = '.';
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}
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// we will read past any excessively long string, so
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// the following data can be read, but the string will
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// be truncated
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if( l < bufferSize - 1 )
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{
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buffer[l] = c;
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l++;
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}
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}
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buffer[l] = 0;
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return l;
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}
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/*
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========================
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idBitMsg::ReadString
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========================
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*/
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int idBitMsg::ReadString( idStr& str ) const
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{
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ReadByteAlign();
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int cnt = 0;
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for( int i = readCount; i < curSize; i++ )
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{
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if( readData[i] == 0 )
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{
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break;
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}
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cnt++;
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}
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str.Clear();
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str.Append( ( const char* )readData + readCount, cnt );
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readCount += cnt + 1;
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return str.Length();
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}
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/*
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========================
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idBitMsg::ReadData
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========================
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*/
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int idBitMsg::ReadData( void* data, int length ) const
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{
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int cnt;
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ReadByteAlign();
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cnt = readCount;
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if( readCount + length > curSize )
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{
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if( data )
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{
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memcpy( data, readData + readCount, GetRemainingData() );
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}
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readCount = curSize;
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}
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else
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{
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if( data )
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{
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memcpy( data, readData + readCount, length );
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}
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readCount += length;
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}
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return ( readCount - cnt );
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}
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/*
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========================
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idBitMsg::ReadNetadr
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========================
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*/
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void idBitMsg::ReadNetadr( netadr_t* adr ) const
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{
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ReadData( adr->ip, 4 );
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adr->port = ReadUShort();
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adr->type = ( netadrtype_t ) ReadByte();
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}
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/*
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========================
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idBitMsg::ReadDeltaDict
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========================
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*/
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bool idBitMsg::ReadDeltaDict( idDict& dict, const idDict* base ) const
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{
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char key[MAX_STRING_CHARS];
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char value[MAX_STRING_CHARS];
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bool changed = false;
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if( base != NULL )
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{
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dict = *base;
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}
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else
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{
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dict.Clear();
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}
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while( ReadString( key, sizeof( key ) ) != 0 )
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{
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ReadString( value, sizeof( value ) );
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dict.Set( key, value );
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changed = true;
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}
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while( ReadString( key, sizeof( key ) ) != 0 )
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{
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dict.Delete( key );
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changed = true;
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}
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return changed;
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}
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/*
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========================
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idBitMsg::DirToBits
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========================
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*/
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int idBitMsg::DirToBits( const idVec3& dir, int numBits )
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{
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int max, bits;
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float bias;
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assert( numBits >= 6 && numBits <= 32 );
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assert( dir.LengthSqr() - 1.0f < 0.01f );
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numBits /= 3;
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max = ( 1 << ( numBits - 1 ) ) - 1;
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bias = 0.5f / max;
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bits = IEEE_FLT_SIGNBITSET( dir.x ) << ( numBits * 3 - 1 );
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bits |= ( idMath::Ftoi( ( idMath::Fabs( dir.x ) + bias ) * max ) ) << ( numBits * 2 );
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bits |= IEEE_FLT_SIGNBITSET( dir.y ) << ( numBits * 2 - 1 );
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bits |= ( idMath::Ftoi( ( idMath::Fabs( dir.y ) + bias ) * max ) ) << ( numBits * 1 );
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bits |= IEEE_FLT_SIGNBITSET( dir.z ) << ( numBits * 1 - 1 );
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bits |= ( idMath::Ftoi( ( idMath::Fabs( dir.z ) + bias ) * max ) ) << ( numBits * 0 );
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return bits;
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}
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/*
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========================
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idBitMsg::BitsToDir
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========================
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*/
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idVec3 idBitMsg::BitsToDir( int bits, int numBits )
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{
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static float sign[2] = { 1.0f, -1.0f };
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int max;
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float invMax;
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idVec3 dir;
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assert( numBits >= 6 && numBits <= 32 );
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numBits /= 3;
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max = ( 1 << ( numBits - 1 ) ) - 1;
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invMax = 1.0f / max;
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dir.x = sign[( bits >> ( numBits * 3 - 1 ) ) & 1] * ( ( bits >> ( numBits * 2 ) ) & max )
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* invMax;
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dir.y = sign[( bits >> ( numBits * 2 - 1 ) ) & 1] * ( ( bits >> ( numBits * 1 ) ) & max )
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* invMax;
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dir.z = sign[( bits >> ( numBits * 1 - 1 ) ) & 1] * ( ( bits >> ( numBits * 0 ) ) & max )
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* invMax;
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dir.NormalizeFast();
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return dir;
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}
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