msg.cpp

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/*
Copyright (C) 1997-2001 Id Software, Inc.

This program 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 2
of the License, or (at your option) any later version.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#include "common.h"
#include "msg.h"

void SZ_Init (sizebuf_t* buf, byte*  data, int length)
{
    OBJZERO(*buf);
    buf->data = data;
    buf->maxsize = length;
}

void SZ_Clear (sizebuf_t* buf)
{
    buf->cursize = 0;
}

static void* SZ_GetSpace (sizebuf_t* buf, int length)
{
    if (buf->cursize + length > buf->maxsize)
        Com_Error(ERR_FATAL, "SZ_GetSpace: overflow");

    void* data = buf->data + buf->cursize;
    buf->cursize += length;

    return data;
}

void SZ_Write (sizebuf_t* buf, const void* data, int length)
{
    memcpy(SZ_GetSpace(buf, length), data, length);
}