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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include "SC_Endian.h"
#include "SC_Types.h"
#include <stdexcept>
#include <cstring>
#include <string>
template <int MaxPacketSize = 8192> struct scpacket {
static const int kBufSize = MaxPacketSize / sizeof(int32); // round down
int32 *wrpos, *endpos, *msgsizepos;
char* tagwrpos;
int inbundle;
int32 buf[kBufSize];
void throw_overflow_exception() { throw std::runtime_error(std::string("buffer overflow")); }
scpacket() { reset(); }
void reset() {
wrpos = buf;
endpos = buf + kBufSize;
inbundle = 0;
}
void addi(int i) {
if (wrpos >= endpos)
throw_overflow_exception();
*wrpos++ = sc_htonl(i);
}
void addii(int64 ii) {
int i;
i = (int)(ii >> 32);
addi(i);
i = (int)ii;
addi(i);
}
void addf(float f) {
if (wrpos >= endpos)
throw_overflow_exception();
elem32 slot;
slot.f = f;
*wrpos++ = sc_htonl(slot.i);
}
void addd(double f) {
if (wrpos >= endpos)
throw_overflow_exception();
elem64 slot;
slot.f = f;
*wrpos++ = sc_htonl(slot.i >> 32);
*wrpos++ = sc_htonl(slot.i & 0x00000000FFFFFFFF);
}
void adds(const char* src) {
size_t len = strlen(src);
size_t len4 = (len + 4) >> 2;
if (wrpos + len4 > endpos)
throw_overflow_exception();
wrpos[len4 - 1] = 0;
memcpy(wrpos, src, len);
wrpos += len4;
}
void adds_slpre(const char* src) // prepends a slash
{
size_t len = strlen(src);
size_t len4 = (len + 5) >> 2;
if (wrpos + len4 > endpos)
throw_overflow_exception();
wrpos[len4 - 1] = 0;
char* wrpos_c = (char*)wrpos;
*wrpos_c = '/';
memcpy(wrpos_c + 1, src, len);
wrpos += len4;
}
void adds(const char* src, size_t len) {
size_t len4 = (len + 4) >> 2;
if (wrpos + len4 > endpos)
throw_overflow_exception();
wrpos[len4 - 1] = 0;
memcpy(wrpos, src, len);
wrpos += len4;
}
void addb(uint8* src, size_t len) {
size_t len4 = (len + 3) >> 2;
if (wrpos + (len4 + 1) > endpos)
throw_overflow_exception();
wrpos[len4 - 1] = 0;
int32 swaplen = len;
*wrpos++ = sc_htonl(swaplen);
memcpy(wrpos, src, len);
wrpos += len4;
}
void addtag(char c) { *tagwrpos++ = c; }
void skip(int n) {
if (wrpos + n > endpos)
throw_overflow_exception();
wrpos += n;
}
void maketags(int n) {
int size4 = (n + 4) >> 2;
tagwrpos = (char*)wrpos;
skip(size4);
wrpos[-1] = 0;
}
size_t size() { return (char*)wrpos - (char*)buf; }
char* data() { return (char*)buf; }
void OpenBundle(int64 time) {
inbundle++;
adds("#bundle");
addii(time);
}
void CloseBundle() {
if (inbundle)
inbundle--;
}
void BeginMsg() {
if (inbundle) {
msgsizepos = wrpos;
addi(0);
}
}
void EndMsg() {
if (inbundle) {
*msgsizepos = sc_htonl(((wrpos - msgsizepos) - 1) * sizeof(int32));
}
}
};
typedef scpacket<> small_scpacket;
typedef scpacket<65516> big_scpacket;
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