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/*
flext - C++ layer for Max/MSP and pd (pure data) externals
Copyright (c) 2001-2003 Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
/*! \file flsupport.cpp
\brief flext support functions and classes.
*/
#include "flext.h"
const t_symbol *flext::sym_float = NULL;
const t_symbol *flext::sym_symbol = NULL;
const t_symbol *flext::sym_bang = NULL;
const t_symbol *flext::sym_list = NULL;
const t_symbol *flext::sym_pointer = NULL;
const t_symbol *flext::sym_int = NULL;
#if FLEXT_SYS != FLEXT_SYS_JMAX
const t_symbol *flext::sym_anything = NULL;
#endif
#if FLEXT_SYS == FLEXT_SYS_PD
const t_symbol *flext::sym_signal = NULL;
#endif
void flext::Setup()
{
static bool issetup = false;
if(issetup)
return;
else issetup = true;
#if FLEXT_SYS == FLEXT_SYS_PD
sym_anything = &s_anything;
sym_pointer = &s_pointer;
sym_float = &s_float;
sym_symbol = &s_symbol;
sym_bang = &s_bang;
sym_list = &s_list;
sym_signal = &s_signal;
#elif FLEXT_SYS == FLEXT_SYS_MAX
sym_int = gensym("int");
sym_float = gensym("float");
sym_symbol = gensym("symbol");
sym_bang = gensym("bang");
sym_list = gensym("list");
sym_anything = gensym("anything");
#elif FLEXT_SYS == FLEXT_SYS_JMAX
sym_int = fts_s_int;
sym_float = fts_s_float;
sym_symbol = fts_s_symbol;
sym_bang = fts_s_bang;
sym_list = fts_s_list;
sym_pointer = fts_s_pointer;
#else
#endif
#ifdef FLEXT_THREADS
thrid = GetThreadId();
StartHelper();
#endif
}
/////////////////////////////////////////////////////////
// overloaded new/delete memory allocation methods
//
/////////////////////////////////////////////////////////
void *flext::operator new(size_t bytes)
{
bytes += sizeof(size_t);
#if FLEXT_SYS == FLEXT_SYS_JMAX
char *blk = (char *)::fts_malloc(bytes);
#else
char *blk = (char *)::getbytes(bytes);
#endif
*(size_t *)blk = bytes;
return blk+sizeof(size_t);
}
void flext::operator delete(void *blk)
{
char *ori = (char *)blk-sizeof(size_t);
#if FLEXT_SYS == FLEXT_SYS_JMAX
fts_free(ori);
#else
size_t bytes = *(size_t *)ori;
::freebytes(ori,bytes);
#endif
}
void *flext::NewAligned(size_t bytes,int bitalign)
{
const size_t ovh = sizeof(size_t)+sizeof(char *);
const unsigned long alignovh = bitalign/8-1;
bytes += ovh+alignovh;
#if FLEXT_SYS == FLEXT_SYS_JMAX
char *blk = (char *)::fts_malloc(bytes);
#else
char *blk = (char *)::getbytes(bytes);
#endif
char *ablk = reinterpret_cast<char *>((reinterpret_cast<unsigned long>(blk)+ovh+alignovh) & ~alignovh);
*(char **)(ablk-sizeof(size_t)-sizeof(char *)) = blk;
*(size_t *)(ablk-sizeof(size_t)) = bytes;
return ablk;
}
void flext::FreeAligned(void *blk)
{
char *ori = *(char **)((char *)blk-sizeof(size_t)-sizeof(char *));
#if FLEXT_SYS == FLEXT_SYS_JMAX
fts_free(ori);
#else
size_t bytes = *(size_t *)((char *)blk-sizeof(size_t));
::freebytes(ori,bytes);
#endif
}
// ------------------------------------------
/*! \todo there is probably also a shortcut for Max and jMax
\todo size checking
*/
void flext::GetAString(const t_atom &a,char *buf,int szbuf)
{
#if FLEXT_SYS == FLEXT_SYS_PD
atom_string(const_cast<t_atom *>(&a),buf,szbuf);
#else
// no checking for size here
if(IsSymbol(a)) sprintf(buf,GetString(a));
else if(IsFloat(a)) sprintf(buf,"%f",GetFloat(a));
else if(IsInt(a)) sprintf(buf,"%i",GetInt(a));
else *buf = 0;
#endif
}
unsigned long flext::AtomHash(const t_atom &a)
{
#if FLEXT_SYS == FLEXT_SYS_MAX || FLEXT_SYS == FLEXT_SYS_PD
return ((unsigned long)a.a_type<<28)^*(unsigned long *)&a.a_w;
#else
#error Not implemented
#endif
}
unsigned int flext::FoldBits(unsigned long h,int bits)
{
if(!bits) return 0;
const int hmax = (1<<bits)-1;
unsigned int ret = 0;
for(unsigned int i = 0; i < sizeof(h)*8; i += bits)
ret ^= (h>>i)&hmax;
return ret;
}
int flext::Int2Bits(unsigned long n)
{
int b;
for(b = 0; n; ++b) n >>= 1;
return b;
}
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