yquake2remaster/src/common/szone.c

/*
 * 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.
 *
 * =======================================================================
 *
 * Server zone, server side of memory management
 *
 * =======================================================================
 */  

#include "header/common.h"

void SZ_Init (sizebuf_t *buf, byte *data, int length)
{
	memset (buf, 0, sizeof(*buf));
	buf->data = data;
	buf->maxsize = length;
}

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

void *SZ_GetSpace (sizebuf_t *buf, int length)
{
	void	*data;

	if (buf->cursize + length > buf->maxsize)
	{
		if (!buf->allowoverflow)
			Com_Error (ERR_FATAL, "SZ_GetSpace: overflow without allowoverflow set");

		if (length > buf->maxsize)
			Com_Error (ERR_FATAL, "SZ_GetSpace: %i is > full buffer size", length);

		SZ_Clear (buf);
		buf->overflowed = true;
		Com_Printf ("SZ_GetSpace: overflow\n");
	}

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

	return data;
}

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

void SZ_Print (sizebuf_t *buf, char *data)
{
	int		len;

	len = (int)strlen(data)+1;

	if (buf->cursize)
	{
		if (buf->data[buf->cursize-1])
			memcpy ((byte *)SZ_GetSpace(buf, len),data,len); /* no trailing 0 */

		else
			memcpy ((byte *)SZ_GetSpace(buf, len-1)-1,data,len); /* write over trailing 0 */
	}

	else
		memcpy ((byte *)SZ_GetSpace(buf, len),data,len);
}