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/*
BINSTD.C
Define various standard binary data formats.
$Id: binstd.c,v 1.1 1993/08/27 18:32:09 munro Exp $
*/
/* Copyright (c) 1994. The Regents of the University of California.
All rights reserved. */
#include "binio.h"
#include "defmem.h"
/* ------------------------------------------------------------------------ */
/* FLOATING POINT FORMATS */
/* ------------------------------------------------------------------------ */
extern FPLayout fp4ieee, fp8ieee, fp12ieee,
fp8cray, fp4vax, fp8hvax, fp8gvax;
#define REF_COUNTER 0
/* S& E& E# M& M# M? E-bias */
FPLayout fp4ieee= {REF_COUNTER, 0, 1, 8, 9, 23, 0, 0x7fL};
FPLayout fp8ieee= {REF_COUNTER, 0, 1, 11, 12, 52, 0, 0x3ffL};
FPLayout fp12ieee= {REF_COUNTER, 0, 1, 15, 32, 64, 1, 0x3ffeL};
FPLayout fp8cray= {REF_COUNTER, 0, 1, 15, 16, 48, 1, 0x4000L};
FPLayout fp4vax= {REF_COUNTER, 0, 1, 8, 9, 23, 0, 0x81L};
FPLayout fp8hvax= {REF_COUNTER, 0, 1, 8, 9, 55, 0, 0x81L};
FPLayout fp8gvax= {REF_COUNTER, 0, 1, 11, 12, 52, 0, 0x401L};
/* S& bit address of sign
E& bit address of exponent
E# number of bits in exponent
M& bit address of mantissa
M# number of bits in mantissa
M? 0 iff high order mantissa bit (always 1) is implicit
E-bias exponent bias
*/
static long knownSizes[]= {4, 8, 12, 16, 0};
static FPLayout *known4[]= {&fp4ieee, &fp4vax, 0};
static FPLayout *known8[]= {&fp8ieee, &fp8cray, &fp8hvax, &fp8gvax, 0};
static FPLayout *known12[]= {&fp12ieee, 0};
static FPLayout *known16[]= {0};
static FPLayout *knownMisc[]= {0};
static FPLayout **knownLayouts[]= {
known4, known8, known12, known16, knownMisc};
/* ------------------------------------------------------------------------ */
/* BIG-ENDIAN MACHINES */
/* ------------------------------------------------------------------------ */
extern DataLayout bigendLayout[6], sun3Layout[6], pdbLayout[6],
crayLayout[6], cchybridLayout[6], mac4Layout[7], mac2Layout[7];
/* Each data type is represented by {alignment, size, order, fpLayout},
and each machine has an array of 6 types in the order:
char, short, int, long, float, double
Some machines include an alternate form of double as a 7th type.
*/
/* The primitive data type formats are the same for the following
machines:
Sun SPARC, HP 700 series, IBM RS6000, SGI, and MIPS workstations
*/
DataLayout bigendLayout[6]= {
{1, 1, 1, 0}, {2, 2, 1, 0}, {4, 4, 1, 0}, {4, 4, 1, 0},
{4, 4, 1, &fp4ieee}, {8, 8, 1, &fp8ieee}
};
/* Sun-2 and Sun-3 (M68000-based) have less restrictive alignments */
DataLayout sun3Layout[6]= {
{1, 1, 1, 0}, {2, 2, 1, 0}, {2, 4, 1, 0}, {2, 4, 1, 0},
{2, 4, 1, &fp4ieee}, {2, 8, 1, &fp8ieee}
};
/* Default for old PDBLib corresponds to no known machine (?!) */
DataLayout pdbLayout[6]= {
{1, 1, 1, 0}, {4, 2, 1, 0}, {4, 4, 1, 0}, {4, 4, 1, 0},
{4, 4, 1, &fp4ieee}, {4, 8, 1, &fp8ieee}
};
/* Unicos Cray 1, XMP, YMP machines */
DataLayout crayLayout[6]= {
{1, 1, 1, 0}, {8, 8, 1, 0}, {8, 8, 1, 0}, {8, 8, 1, 0},
{8, 8, 1, &fp8cray}, {8, 8, 1, &fp8cray}
};
/* Defunct (?) hybrid C compiler on LTSS Crays */
DataLayout cchybridLayout[6]= {
{8, 1, 1, 0}, {8, 8, 1, 0}, {8, 8, 1, 0}, {8, 8, 1, 0},
{8, 8, 1, &fp8cray}, {8, 8, 1, &fp8cray}
};
/* MacIntosh has both 12 and 8 byte double formats, and
compilers disagree about the size of an int */
DataLayout mac4Layout[7]= {
{1, 1, 1, 0}, {2, 2, 1, 0}, {2, 4, 1, 0}, {2, 4, 1, 0},
{2, 4, 1, &fp4ieee}, {2, 12, 1, &fp12ieee},
{2, 8, 1, &fp8ieee}
};
/* NOTE NOTE NOTE -- the fact that the 12 byte double is listed BEFORE
the 8 byte double is significant in binpdb.c */
DataLayout mac2Layout[7]= {
{1, 1, 1, 0}, {2, 2, 1, 0}, {2, 2, 1, 0}, {2, 4, 1, 0},
{2, 4, 1, &fp4ieee}, {2, 12, 1, &fp12ieee},
{2, 8, 1, &fp8ieee}
};
/* ------------------------------------------------------------------------ */
/* LITTLE-ENDIAN MACHINES */
/* ------------------------------------------------------------------------ */
extern DataLayout littleLayout[6], ibmpcLayout[6], xenixLayout[6],
vaxLayout[7];
/* DEC workstations are little-endian version of bigendLayout
IBM PC differs only in having a less restrictive alignment,
and the XENIX OS on PCs differs in int size from that */
DataLayout littleLayout[6]= {
{1, 1, -1, 0}, {2, 2, -1, 0}, {4, 4, -1, 0}, {4, 4, -1, 0},
{4, 4, -1, &fp4ieee}, {8, 8, -1, &fp8ieee}
};
DataLayout ibmpcLayout[6]= {
{1, 1, -1, 0}, {2, 2, -1, 0}, {2, 2, -1, 0}, {2, 4, -1, 0},
{2, 4, -1, &fp4ieee}, {2, 8, -1, &fp8ieee}
};
DataLayout xenixLayout[6]= {
{1, 1, -1, 0}, {2, 2, -1, 0}, {2, 4, -1, 0}, {2, 4, -1, 0},
{2, 4, -1, &fp4ieee}, {2, 8, -1, &fp8ieee}
};
/* VAX has G-format and H-format doubles, as well as
odd byte ordering for all of its floating point formats. */
/* WARNING --
Did I read the lack-of-alignment in the VAX C manual correctly?
PDBLib uses alignment of 4 for all but char... */
DataLayout vaxLayout[7]= {
{1, 1, -1, 0}, {1, 2, -1, 0}, {1, 4, -1, 0}, {1, 4, -1, 0},
{1, 4, -2, &fp4vax}, {1, 8, -2, &fp8hvax},
{1, 8, -2, &fp8gvax}
};
/* ------------------------------------------------------------------------ */
/* END OF DATA LAYOUTS */
/* ------------------------------------------------------------------------ */
FPLayout *MakeFPLayout(FPLayout *model, long size)
{
int i;
FPLayout **list, *layout;
if (!model) return 0;
/* if this floating point layout is for this machine,
just return reference */
if (size==sizeof(float) &&
SameFPLayout(fltLayout, model)) return Ref(fltLayout);
if (size==sizeof(double) &&
SameFPLayout(dblLayout, model)) return Ref(dblLayout);
/* if this floating point layout is known, just return reference */
for (i=0 ; knownSizes[i] ; i++) if (knownSizes[i]==size) break;
list= knownLayouts[i];
while (*list) {
if (SameFPLayout(*list, model)) return Ref(*list);
list++;
}
/* otherwise, make a fresh copy */
layout= Ymalloc(sizeof(FPLayout));
layout->references= 0;
layout->sgnAddr= model->sgnAddr;
layout->expAddr= model->expAddr;
layout->expSize= model->expSize;
layout->manAddr= model->manAddr;
layout->manSize= model->manSize;
layout->manNorm= model->manNorm;
layout->expBias= model->expBias;
return layout;
}
int SameFPLayout(FPLayout *l, FPLayout *m)
{
return (l->sgnAddr==m->sgnAddr && l->expAddr==m->expAddr &&
l->expSize==m->expSize && l->manAddr==m->manAddr &&
l->manSize==m->manSize && l->manNorm==m->manNorm &&
l->expBias==m->expBias);
}
void FreeFPLayout(FPLayout *layout)
{
if (layout && !layout->references--) Yfree(layout);
}
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