mirror of
https://github.com/ZDoom/Raze.git
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431 lines
8.9 KiB
C++
431 lines
8.9 KiB
C++
/*
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** d_protocol.cpp
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** Basic network packet creation routines and simple IFF parsing
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**
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**---------------------------------------------------------------------------
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** Copyright 1998-2006 Randy Heit
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include "d_protocol.h"
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#include "d_net.h"
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#include "cmdlib.h"
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#include "serializer.h"
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extern int gametic;
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char *ReadString (uint8_t **stream)
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{
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char *string = *((char **)stream);
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*stream += strlen (string) + 1;
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return copystring (string);
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}
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const char *ReadStringConst(uint8_t **stream)
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{
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const char *string = *((const char **)stream);
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*stream += strlen (string) + 1;
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return string;
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}
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int ReadByte (uint8_t **stream)
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{
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uint8_t v = **stream;
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*stream += 1;
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return v;
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}
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int ReadWord (uint8_t **stream)
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{
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short v = (((*stream)[0]) << 8) | (((*stream)[1]));
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*stream += 2;
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return v;
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}
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int ReadLong (uint8_t **stream)
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{
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int v = (((*stream)[0]) << 24) | (((*stream)[1]) << 16) | (((*stream)[2]) << 8) | (((*stream)[3]));
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*stream += 4;
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return v;
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}
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float ReadFloat (uint8_t **stream)
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{
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union
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{
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int i;
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float f;
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} fakeint;
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fakeint.i = ReadLong (stream);
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return fakeint.f;
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}
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void WriteString (const char *string, uint8_t **stream)
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{
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char *p = *((char **)stream);
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while (*string) {
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*p++ = *string++;
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}
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*p++ = 0;
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*stream = (uint8_t *)p;
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}
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void WriteByte (uint8_t v, uint8_t **stream)
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{
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**stream = v;
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*stream += 1;
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}
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void WriteWord (short v, uint8_t **stream)
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{
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(*stream)[0] = v >> 8;
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(*stream)[1] = v & 255;
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*stream += 2;
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}
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void WriteLong (int v, uint8_t **stream)
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{
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(*stream)[0] = v >> 24;
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(*stream)[1] = (v >> 16) & 255;
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(*stream)[2] = (v >> 8) & 255;
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(*stream)[3] = v & 255;
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*stream += 4;
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}
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void WriteFloat (float v, uint8_t **stream)
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{
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union
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{
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int i;
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float f;
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} fakeint;
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fakeint.f = v;
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WriteLong (fakeint.i, stream);
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}
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// Returns the number of bytes read
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int UnpackUserCmd (InputPacket *ucmd, const InputPacket *basis, uint8_t **stream)
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{
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uint8_t *start = *stream;
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uint8_t flags;
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if (basis != NULL)
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{
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if (basis != ucmd)
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{
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memcpy (ucmd, basis, sizeof(InputPacket));
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}
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}
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else
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{
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memset (ucmd, 0, sizeof(InputPacket));
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}
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flags = ReadByte (stream);
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if (flags)
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{
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// We can support up to 29 buttons, using from 0 to 4 bytes to store them.
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if (flags & UCMDF_BUTTONS)
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ucmd->actions = ESyncBits::FromInt(ReadLong(stream));
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if (flags & UCMDF_PITCH)
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ucmd->horz = ReadFloat(stream);
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if (flags & UCMDF_YAW)
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ucmd->avel = ReadFloat(stream);
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if (flags & UCMDF_FORWARDMOVE)
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ucmd->fvel = ReadLong (stream);
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if (flags & UCMDF_SIDEMOVE)
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ucmd->svel = ReadLong (stream);
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}
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return int(*stream - start);
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}
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// Returns the number of bytes written
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int PackUserCmd (const InputPacket *ucmd, const InputPacket *basis, uint8_t **stream)
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{
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uint8_t flags = 0;
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uint8_t *temp = *stream;
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uint8_t *start = *stream;
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InputPacket blank;
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if (basis == NULL)
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{
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memset (&blank, 0, sizeof(blank));
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basis = ␣
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}
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WriteByte (0, stream); // Make room for the packing bits
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if (ucmd->actions != basis->actions)
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{
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flags |= UCMDF_BUTTONS;
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WriteLong(ucmd->actions, stream);
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}
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if (ucmd->horz != basis->horz)
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{
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flags |= UCMDF_PITCH;
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WriteFloat (ucmd->horz, stream);
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}
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if (ucmd->avel != basis->avel)
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{
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flags |= UCMDF_YAW;
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WriteFloat (ucmd->avel, stream);
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}
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if (ucmd->fvel != basis->fvel)
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{
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flags |= UCMDF_FORWARDMOVE;
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WriteLong (ucmd->fvel, stream);
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}
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if (ucmd->svel != basis->svel)
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{
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flags |= UCMDF_SIDEMOVE;
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WriteLong (ucmd->svel, stream);
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}
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// Write the packing bits
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WriteByte (flags, &temp);
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return int(*stream - start);
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}
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FSerializer &Serialize(FSerializer &arc, const char *key, ticcmd_t &cmd, ticcmd_t *def)
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{
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if (arc.BeginObject(key))
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{
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arc("consistency", cmd.consistency)
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("ucmd", cmd.ucmd)
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.EndObject();
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}
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return arc;
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}
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FSerializer &Serialize(FSerializer &arc, const char *key, InputPacket &cmd, InputPacket *def)
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{
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if (arc.BeginObject(key))
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{
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arc("actions", cmd.actions)
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("horz", cmd.horz)
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("avel", cmd.avel)
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("fvel", cmd.fvel)
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("svwl", cmd.svel)
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.EndObject();
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}
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return arc;
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}
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int WriteUserCmdMessage (InputPacket *ucmd, const InputPacket *basis, uint8_t **stream)
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{
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if (basis == NULL)
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{
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if (ucmd->actions != 0 ||
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ucmd->horz != 0 ||
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ucmd->avel != 0 ||
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ucmd->fvel != 0 ||
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ucmd->svel != 0)
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{
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WriteByte (DEM_USERCMD, stream);
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return PackUserCmd (ucmd, basis, stream) + 1;
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}
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}
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else
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if (ucmd->actions != basis->actions ||
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ucmd->horz != basis->horz ||
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ucmd->avel != basis->avel ||
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ucmd->fvel != basis->fvel ||
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ucmd->svel != basis->svel)
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{
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WriteByte (DEM_USERCMD, stream);
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return PackUserCmd (ucmd, basis, stream) + 1;
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}
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WriteByte (DEM_EMPTYUSERCMD, stream);
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return 1;
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}
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int SkipTicCmd (uint8_t **stream, int count)
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{
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int i, skip;
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uint8_t *flow = *stream;
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for (i = count; i > 0; i--)
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{
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bool moreticdata = true;
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flow += 2; // Skip consistancy marker
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while (moreticdata)
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{
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uint8_t type = *flow++;
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if (type == DEM_USERCMD)
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{
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moreticdata = false;
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skip = 1;
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if (*flow & UCMDF_PITCH) skip += 4;
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if (*flow & UCMDF_YAW) skip += 4;
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if (*flow & UCMDF_FORWARDMOVE) skip += 4;
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if (*flow & UCMDF_SIDEMOVE) skip += 4;
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if (*flow & UCMDF_UPMOVE) skip += 4;
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if (*flow & UCMDF_ROLL) skip += 4;
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if (*flow & UCMDF_BUTTONS) skip += 4;
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flow += skip;
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}
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else if (type == DEM_EMPTYUSERCMD)
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{
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moreticdata = false;
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}
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else
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{
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Net_SkipCommand (type, &flow);
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}
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}
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}
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skip = int(flow - *stream);
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*stream = flow;
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return skip;
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}
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extern short consistency[MAXPLAYERS][BACKUPTICS];
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void ReadTicCmd (uint8_t **stream, int player, int tic)
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{
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int type;
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uint8_t *start;
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ticcmd_t *tcmd;
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int ticmod = tic % BACKUPTICS;
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tcmd = &netcmds[player][ticmod];
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tcmd->consistency = ReadWord (stream);
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start = *stream;
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while ((type = ReadByte (stream)) != DEM_USERCMD && type != DEM_EMPTYUSERCMD)
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Net_SkipCommand (type, stream);
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NetSpecs[player][ticmod].SetData (start, int(*stream - start - 1));
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if (type == DEM_USERCMD)
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{
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UnpackUserCmd (&tcmd->ucmd,
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tic ? &netcmds[player][(tic-1)%BACKUPTICS].ucmd : NULL, stream);
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}
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else
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{
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if (tic)
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{
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memcpy (&tcmd->ucmd, &netcmds[player][(tic-1)%BACKUPTICS].ucmd, sizeof(tcmd->ucmd));
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}
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else
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{
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memset (&tcmd->ucmd, 0, sizeof(tcmd->ucmd));
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}
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}
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#if 0
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if (player==consoleplayer&&tic>BACKUPTICS)
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assert(consistancy[player][ticmod] == tcmd->consistancy);
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#endif
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}
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void RunNetSpecs (int player, int buf)
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{
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uint8_t *stream;
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int len;
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if (gametic % ticdup == 0)
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{
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stream = NetSpecs[player][buf].GetData (&len);
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if (stream)
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{
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uint8_t *end = stream + len;
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while (stream < end)
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{
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int type = ReadByte (&stream);
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try
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{
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Net_DoCommand(type, &stream, player);
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}
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catch (...)
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{
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NetSpecs[player][buf].SetData(NULL, 0);
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throw;
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}
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}
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#if 0
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if (!demorecording)
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#endif
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NetSpecs[player][buf].SetData (NULL, 0);
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}
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}
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}
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uint8_t *lenspot;
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// Write the header of an IFF chunk and leave space
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// for the length field.
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void StartChunk (int id, uint8_t **stream)
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{
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WriteLong (id, stream);
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lenspot = *stream;
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*stream += 4;
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}
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// Write the length field for the chunk and insert
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// pad byte if the chunk is odd-sized.
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void FinishChunk (uint8_t **stream)
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{
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int len;
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if (!lenspot)
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return;
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len = int(*stream - lenspot - 4);
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WriteLong (len, &lenspot);
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if (len & 1)
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WriteByte (0, stream);
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lenspot = NULL;
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}
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// Skip past an unknown chunk. *stream should be
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// pointing to the chunk's length field.
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void SkipChunk (uint8_t **stream)
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{
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int len;
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len = ReadLong (stream);
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*stream += len + (len & 1);
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}
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