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/* endian.c */
/*****************************************************************************/
/* AS-Portierung */
/* */
/* Little/Big-Endian-Routinen */
/* */
/* Historie: 30. 5.1996 Grundsteinlegung */
/* 6. 7.1997 Dec32BlankString dazu */
/* */
/*****************************************************************************/
#include "stdinc.h"
#include <string.h>
#include "endian.h"
/*****************************************************************************/
Boolean BigEndian;
char *Integ16Format,*Integ32Format,*Integ64Format;
char *IntegerFormat,*LongIntFormat,*QuadIntFormat;
char *LargeIntFormat;
/*****************************************************************************/
void WSwap(void *Field, int Cnt)
BEGIN
register unsigned char *Run=(unsigned char *) Field,Swap;
register int z;
for (z=0; z<Cnt/2; z++,Run+=2)
BEGIN
Swap=Run[0]; Run[0]=Run[1]; Run[1]=Swap;
END
END
void DSwap(void *Field, int Cnt)
BEGIN
register unsigned char *Run=(unsigned char *) Field,Swap;
register int z;
for (z=0; z<Cnt/4; z++,Run+=4)
BEGIN
Swap=Run[0]; Run[0]=Run[3]; Run[3]=Swap;
Swap=Run[1]; Run[1]=Run[2]; Run[2]=Swap;
END
END
void QSwap(void *Field, int Cnt)
BEGIN
register unsigned char *Run=(unsigned char *) Field,Swap;
register int z;
for (z=0; z<Cnt/8; z++,Run+=8)
BEGIN
Swap=Run[0]; Run[0]=Run[7]; Run[7]=Swap;
Swap=Run[1]; Run[1]=Run[6]; Run[6]=Swap;
Swap=Run[2]; Run[2]=Run[5]; Run[5]=Swap;
Swap=Run[3]; Run[3]=Run[4]; Run[4]=Swap;
END
END
void DWSwap(void *Field, int Cnt)
BEGIN
register unsigned char *Run=(unsigned char *) Field,Swap;
register int z;
for (z=0; z<Cnt/4; z++,Run+=4)
BEGIN
Swap=Run[0]; Run[0]=Run[2]; Run[2]=Swap;
Swap=Run[1]; Run[1]=Run[3]; Run[3]=Swap;
END
END
void QWSwap(void *Field, int Cnt)
BEGIN
register unsigned char *Run=(unsigned char *) Field,Swap;
register int z;
for (z=0; z<Cnt/8; z++,Run+=8)
BEGIN
Swap=Run[0]; Run[0]=Run[6]; Run[6]=Swap;
Swap=Run[1]; Run[1]=Run[7]; Run[7]=Swap;
Swap=Run[2]; Run[2]=Run[4]; Run[4]=Swap;
Swap=Run[3]; Run[3]=Run[5]; Run[5]=Swap;
END
END
void Double_2_ieee4(Double inp, Byte *dest, Boolean NeedsBig)
BEGIN
#ifdef IEEEFLOAT
Single tmp=inp;
memcpy(dest,&tmp,4);
if (BigEndian!=NeedsBig) DSwap(dest,4);
#endif
#ifdef VAXFLOAT
Single tmp=inp/4;
memcpy(dest,&tmp,4);
WSwap(dest,4);
if (NOT NeedsBig) DSwap(dest,4);
#endif
END
void Double_2_ieee8(Double inp, Byte *dest, Boolean NeedsBig)
BEGIN
#ifdef IEEEFLOAT
memcpy(dest,&inp,8);
if (BigEndian!=NeedsBig) QSwap(dest,8);
#endif
#ifdef VAXFLOAT
Byte tmp[8];
Word Exp;
int z;
Boolean cont;
memcpy(tmp,&inp,8);
WSwap(tmp,8);
Exp=((tmp[0]<<1)&0xfe)+(tmp[1]>>7);
Exp+=894; /* =1023-192 */
tmp[1]&=0x7f;
if ((tmp[7]&7)>4)
BEGIN
for (tmp[7]+=8,cont=tmp[7]<8,z=0; cont AND z>1; z--)
BEGIN
tmp[z]++; cont=(tmp[z]==0);
END
if (cont)
BEGIN
tmp[1]++; if (tmp[1]>127) Exp++;
END
END
dest[7]=(tmp[0]&0x80)+((Exp>>4)&0x7f);
dest[6]=((Exp&0x0f)<<4)+((tmp[1]>>3)&0x0f);
for (z=5; z>=0; z--)
dest[z]=((tmp[6-z]&7)<<5)|((tmp[7-z]>>3)&0x1f);
if (NeedsBig) QSwap(dest,8);
#endif
END
void Double_2_ieee10(Double inp, Byte *dest, Boolean NeedsBig)
BEGIN
Byte Buffer[8];
Byte Sign;
Word Exponent;
int z;
#ifdef IEEEFLOAT
Boolean Denormal;
memcpy(Buffer,&inp,8); if (BigEndian) QSwap(Buffer,8);
Sign=(Buffer[7]&0x80);
Exponent=(Buffer[6]>>4)+(((Word) Buffer[7]&0x7f)<<4);
Denormal=(Exponent==0);
if (Exponent==2047) Exponent=32767;
else Exponent+=(16383-1023);
Buffer[6]&=0x0f; if (NOT Denormal) Buffer[6]|=0x10;
for (z=7; z>=2; z--)
dest[z]=((Buffer[z-1]&0x1f)<<3)|((Buffer[z-2]&0xe0)>>5);
dest[1]=(Buffer[0]&0x1f)<<3;
dest[0]=0;
#endif
#ifdef VAXFLOAT
memcpy(Buffer,&inp,8); WSwap(Buffer,8);
Sign=(*Buffer)&0x80;
Exponent=((*Buffer)<<1)+((Buffer[1]&0x80)>>7);
Exponent+=(16383-129);
Buffer[1]|=0x80;
for (z=1; z<8; z++) dest[z]=Buffer[8-z];
dest[0]=0;
#endif
dest[9]=Sign|((Exponent>>8)&0x7f);
dest[8]=Exponent&0xff;
if (NeedsBig)
for (z=0; z<5; z++)
BEGIN
Sign=dest[z]; dest[z]=dest[9-z]; dest[9-z]=Sign;
END
END
Boolean Read2(FILE *file, void *Ptr)
BEGIN
if (fread(Ptr,1,2,file)!=2) return False;
if (BigEndian) WSwap(Ptr,2);
return True;
END
Boolean Read4(FILE *file, void *Ptr)
BEGIN
if (fread(Ptr,1,4,file)!=4) return False;
if (BigEndian) DSwap(Ptr,4);
return True;
END
Boolean Read8(FILE *file, void *Ptr)
BEGIN
if (fread(Ptr,1,8,file)!=8) return False;
if (BigEndian) QSwap(Ptr,8);
return True;
END
Boolean Write2(FILE *file, void *Ptr)
BEGIN
Boolean OK;
if (BigEndian) WSwap(Ptr,2);
OK=(fwrite(Ptr,1,2,file)==2);
if (BigEndian) WSwap(Ptr,2);
return OK;
END
Boolean Write4(FILE *file, void *Ptr)
BEGIN
Boolean OK;
if (BigEndian) DSwap(Ptr,4);
OK=(fwrite(Ptr,1,4,file)==4);
if (BigEndian) DSwap(Ptr,4);
return OK;
END
Boolean Write8(FILE *file, void *Ptr)
BEGIN
Boolean OK;
if (BigEndian) QSwap(Ptr,8);
OK=(fwrite(Ptr,1,8,file)==8);
if (BigEndian) QSwap(Ptr,8);
return OK;
END
static void CheckSingle(int Is, int Should, char *Name)
BEGIN
if (Is!=Should)
BEGIN
fprintf(stderr,"Configuration error: Sizeof(%s) is %d, should be %d\n",
Name,Is,Should);
exit(255);
END
END
static void CheckDataTypes(void)
BEGIN
if (sizeof(int)<2)
BEGIN
fprintf(stderr,"Configuration error: Sizeof(int) is %d, should be >=2\n",
(int) sizeof(int));
exit(255);
END
CheckSingle(sizeof(Byte), 1,"Byte");
CheckSingle(sizeof(ShortInt),1,"ShortInt");
#ifdef HAS16
CheckSingle(sizeof(Word), 2,"Word");
CheckSingle(sizeof(Integer), 2,"Integer");
#endif
CheckSingle(sizeof(LongInt), 4,"LongInt");
CheckSingle(sizeof(LongWord),4,"LongWord");
#ifdef HAS64
CheckSingle(sizeof(QuadInt), 8,"QuadInt");
CheckSingle(sizeof(QuadWord),8,"QuadWord");
#endif
CheckSingle(sizeof(Single), 4,"Single");
CheckSingle(sizeof(Double), 8,"Double");
END
static char *AssignSingle(int size)
BEGIN
if (size==sizeof(short)) return "%d";
else if (size==sizeof(int)) return "%d";
else if (size==sizeof(long)) return "%ld";
#ifndef NOLONGLONG
else if (size==sizeof(long long)) return "%lld";
#endif
else
BEGIN
fprintf(stderr,
"Configuration error: cannot assign format string for integer of size %d\n",size);
exit(255);
return "";
END
END
static void AssignFormats(void)
BEGIN
#ifdef HAS16
IntegerFormat=Integ16Format=AssignSingle(2);
#endif
LongIntFormat=Integ32Format=AssignSingle(4);
#ifdef HAS64
QuadIntFormat=Integ64Format=AssignSingle(8);
#endif
LargeIntFormat=AssignSingle(sizeof(LargeInt));
END
char *Dec32BlankString(LongInt number, int Stellen)
BEGIN
char Format[10];
static char Erg[255];
sprintf(Format,"%%%d%s",Stellen,LongIntFormat+1);
sprintf(Erg,Format,number);
return Erg;
END
void endian_init(void)
BEGIN
union
{
unsigned char field[sizeof(int)];
int test;
} TwoFace;
CheckDataTypes(); AssignFormats();
memset(TwoFace.field,0,sizeof(int));
TwoFace.field[0]=1;
BigEndian=((TwoFace.test)!=1);
/*if (BigEndian)
BEGIN
fprintf(stderr,"Warning: Big endian machine!\n");
fprintf(stderr,"AS is so far not adapted for big-endian-machines!\n");
END*/
END
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