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/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
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
*/
#ifndef _scpacket_
#define _scpacket_
#include "SC_Endian.h"
#include "SC_Types.h"
#include <stdexcept>
struct netaddr {
int socket;
int addr;
int port;
};
typedef struct netaddr netaddr;
#define kSCMaxPacketSize 8192
struct scpacket {
int32 *wrpos, *endpos, *msgsizepos;
char *tagwrpos;
int inbundle;
int32 buf[kSCMaxPacketSize];
scpacket();
void reset();
void addi(int i);
void addii(int64 ii);
void addf(float f);
void addd(double f);
void adds(char *cstr);
void adds(char *src, size_t len);
void addb(uint8 *src, size_t len);
void addtag(char c);
void skip(int n);
void maketags(int n);
int size() { return (char*)wrpos - (char*)buf; }
char* data() { return (char*)buf; }
void sendudp(int socket, int addr, int port);
void OpenBundle(int64 time);
void CloseBundle();
void BeginMsg();
void EndMsg();
};
inline scpacket::scpacket() { reset(); }
// ways to fail
#define BUFFEROVERFLOW return
//#define BUFFEROVERFLOW throw std::runtime_error("buffer overflow")
inline void scpacket::reset()
{
wrpos = buf;
endpos = buf + kSCMaxPacketSize;
inbundle = 0;
}
inline void scpacket::skip(int n)
{
if (wrpos + n > endpos) BUFFEROVERFLOW;
wrpos += n;
}
inline void scpacket::addtag(char c)
{
*tagwrpos++ = c;
}
inline void scpacket::maketags(int n)
{
int size4 = (n + 4) >> 2;
tagwrpos = (char*)wrpos;
skip(size4);
wrpos[-1] = 0;
}
inline void scpacket::addi(int i)
{
if (wrpos >= endpos) BUFFEROVERFLOW;
*wrpos++ = htonl(i);
}
inline void scpacket::addii(int64 ii)
{
int i;
i = (int)(ii >> 32);
addi(i);
i = (int)ii;
addi(i);
}
inline void scpacket::addf(float f)
{
if (wrpos >= endpos) BUFFEROVERFLOW;
elem32 slot;
slot.f = f;
*wrpos++ = htonl(slot.i);
}
inline void scpacket::addd(double f)
{
if (wrpos >= endpos) BUFFEROVERFLOW;
elem64 slot;
slot.f = f;
*wrpos++ = htonl(slot.i >> 32);
*wrpos++ = htonl(slot.i & 0x00000000FFFFFFFF);
}
inline void scpacket::adds(char *src)
{
size_t len = strlen(src);
size_t len4 = (len + 4) >> 2;
if (wrpos + len4 > endpos) BUFFEROVERFLOW;
wrpos[len4 - 1] = 0;
memcpy(wrpos, src, (size_t)len);
wrpos += len4;
}
inline void scpacket::adds(char *src, size_t len)
{
size_t len4 = (len + 4) >> 2;
if (wrpos + len4 > endpos) BUFFEROVERFLOW;
wrpos[len4 - 1] = 0;
memcpy(wrpos, src, (size_t)len);
wrpos += len4;
}
// support binary objects
inline void scpacket::addb(uint8 *src, size_t len)
{
size_t len4 = (len + 3) >> 2;
if (wrpos + (len4 + 1) > endpos) BUFFEROVERFLOW;
wrpos[len4 - 1] = 0;
int32 swaplen = len;
*wrpos++ = htonl(swaplen);
memcpy(wrpos, src, (size_t)len);
wrpos += len4;
}
inline void scpacket::OpenBundle(int64 time)
{
inbundle++;
adds("#bundle");
addii(time);
}
inline void scpacket::CloseBundle()
{
if (inbundle) inbundle--;
}
inline void scpacket::BeginMsg()
{
if (inbundle) {
msgsizepos = wrpos;
addi(0);
}
}
inline void scpacket::EndMsg()
{
if (inbundle) {
*msgsizepos = htonl(((wrpos - msgsizepos) - 1) * sizeof(int32));
}
}
#endif
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