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util.cpp
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util.cpp
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#include "util.h"
#include <mem.h>
#define swapb(x,y) {byte tmp; tmp=(x); (x)=(y); (y)=tmp;}
static int _swap=1;
int setswap(int swap)
{
_swap=swap; return swap;
}
int swapi4(int x)
{
if(_swap)
{
byte* cbuf;
byte tem;
cbuf=(byte*)&x; /* assign address of input to char array */
tem=cbuf[0]; cbuf[0]=cbuf[3]; cbuf[3]=tem;
tem=cbuf[2]; cbuf[2]=cbuf[1]; cbuf[1]=tem;
}
return x;
}
short swapi2(short x)
{
if(_swap)
{
byte* cbuf;
byte tem;
cbuf=(byte*)&x; /* assign address of input to char array */
tem=cbuf[0]; cbuf[0]=cbuf[1]; cbuf[1]=tem;
}
return x;
}
void ibm2ieee(float* input, int swap)
{
typedef unsigned char byte;
typedef unsigned long ulng;
byte *cbuf,expp,tem,sign;
ulng *umantis,expll;
long *mantis;
int shift;
cbuf=(byte*)&input[0]; /* assign address of input to char array */
umantis=(ulng*)&input[0]; /* two differnt points to the same spot */
mantis =(long*)&input[0]; /* signned & unsigned */
if(swap)
{
/* now byte reverce for PC use if swap true */
tem=cbuf[0]; cbuf[0]=cbuf[3]; cbuf[3]=tem;
tem=cbuf[2]; cbuf[2]=cbuf[1]; cbuf[1]=tem;
}
/* start extraction information from number */
expp=*mantis>>24; /* get expo fro upper byte */
*mantis=(*mantis)<<8; /* shift off upper byte */
shift=1; /* set a counter to 1 */
while(*mantis>0 && shift<23) /* start of shifting data*/
{
*mantis=*mantis<<1;
shift++;
} /* shift until a 1 in msb */
*mantis=*mantis<<1; /* need one more shift to get implied one bit */
sign=expp & 0x80; /* set sign to msb of exponent */
expp=expp & 0x7F; /* kill sign bit */
if(expp!=0) /* don't do anymore if zero exponent */
{
expp=expp-64; /* compute what shift was (old exponent)*/
*umantis=*umantis>>9; /* MOST IMPORTANT an UNSIGNED shift back down */
expll=0x7F+(expp*4-shift); /* add in excess 172 */
/* now mantissa is correctly aligned, now create the other two pairs */
/* needed the extended sign word and the exponent word */
expll=expll<<23; /* shift exponent up */
/* combine them into a floating point IEEE format ! */
if(sign) *umantis=expll | *mantis | 0x80000000;
else *umantis=expll | *mantis; /* set or don't set sign bit */
}
}
void toibm(long *addr, int ll)
{
unsigned long real;
unsigned long lng;
unsigned char *ch;
unsigned int gain,sign,t;
// ch= (long *)&lng;
ch= (unsigned char*)&lng;
while(ll--)
{
if(real = *addr)
{
gain = (real>>23);
sign = (gain & 0x100)>>1;
gain = (gain & 0xff) - 0x80 +2;
real = ((real& 0x7FFFFFL)| 0x800000L);
// real = (real& 0x7FFFFFL);
// real = (real | 0x800000L);
t = gain & 3;
if(t)
{
real >>= 4-t;
gain += 4-t;
}
gain = ((gain>>2) + 0x40) & 0x7f;
gain |= sign;
lng = real;
ch[3] = ch[0];
t = ch[1];
ch[1] = ch[2];
ch[2] = t;
ch[0] = gain;
real = lng;
}
*addr++ = real;
}
}
int tt[256]=
{
32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 91, 46, 60, 40, 43, 33,
38, 32, 32, 32, 32, 32, 32, 32,
32, 32, 93, 36, 42, 41, 59, 94,
45, 47, 32, 32, 32, 32, 32, 32,
32, 32,124, 44, 37, 95, 62, 63,
32, 32, 32, 32, 32, 32,238,160,
161, 96, 58, 35, 64, 39, 61, 34,
230, 97, 98, 99,100,101,102,103,
104,105,164,165,228,163,229,168,
169,106,107,108,109,110,111,112,
113,114,170,171,172,173,174,175,
239,126,115,116,117,118,119,120,
121,122,224,225,226,227,166,162,
236,235,167,232,237,233,231,234,
158,128,129,150,132,133,148,131,
123, 65, 66, 67, 68, 69, 70, 71,
72, 73,149,136,137,138,139,140,
125, 74, 75, 76, 77, 78, 79, 80,
81, 82,141,142,143,159,144,145,
92, 32, 83, 84, 85, 86, 87, 88,
89, 90,146,147,134,130,156,155,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57,135,152,157,153,151, 32
};
unsigned char ebasc(unsigned char ascii)
{
unsigned char ebcd;
ebcd=tt[ascii];
return ebcd;
}
void ebasd(unsigned char* ascii, unsigned char* ebcd)
{
int n;
for(n=0;ebcd[n];n++)
{
ascii[n]=ebasc(ebcd[n]);
}
ascii[n]=0;
}
char asebc(char ascii)
{
char ebcd;
static char tt[256]=
{
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x4F,0x7F,0x7B,0x5B,0x6C,0x50,0x7D, /* !"#$%&' */
0x4D,0x5D,0x5C,0x4E,0x6B,0x60,0x4B,0x61, /* ()*+,-./ */
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7, /* 01234567 */
0xF8,0xF9,0x7A,0x5E,0x4C,0x7E,0x6E,0x6F, /* 89:;<=>? */
0x7C,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7, /* @ABCDEFG */
0xC8,0xC9,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6, /* HIJKLMNO */
0xD7,0xD8,0xD9,0xE2,0xE3,0xE4,0xE5,0xE6, /* PQRSTUVW */
0xE7,0xE8,0xE9,0x4A,0xE0,0x5A,0x5F,0x6D, /* XYZ[\]^_ */
0x79,0x81,0x82,0x83,0x84,0x85,0x86,0x87, /* `abcdefg */
0x88,0x89,0x91,0x92,0x93,0x94,0x95,0x96, /* hijklmno */
0x97,0x98,0x99,0xA2,0xA3,0xA4,0xA5,0xA6, /* pqrstuvw */
0xA7,0xA8,0xA9,0xC0,0x6A,0xD0,0xA1,0x40, /* xyz{|}~ */
0xB9,0xBA,0xED,0xBF,0xBC,0xBD,0xEC,0xFA, /* */
0xCB,0xCC,0xCD,0xCE,0xCF,0xDA,0xDB,0xDC, /* */
0xDE,0xDF,0xEA,0xEB,0xBE,0xCA,0xBB,0xFE, /* */
0xFB,0xFD,0x7d,0xEF,0xEE,0xFC,0xB8,0xDD, /* */
0x77,0x78,0xAF,0x8D,0x8A,0x8B,0xAE,0xB2, /* */
0x8F,0x90,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0xAA,0xAB,0xAC,0xAD,0x8C,0x8E,0x80,0xB6, /* ðñòóôõö÷ */
0xB3,0xB5,0xB7,0xB1,0xB0,0xB4,0x76,0xA0, /* øùúûüýþÿ */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, /* */
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40 /* */
};
ebcd=tt[ascii];
return ebcd;
}
void asebd( char* ebcd, char* ascii)
{
int n;
for(n=0;ascii[n];n++)
{
ebcd[n]=asebc(ascii[n]);
}
ebcd[n]=0;
}
void si4(char* buf, int nbyte, int i)
{
union { byte h[4]; int x; } u;
u.x=i;
if(_swap) { swapb(u.h[0], u.h[3]); swapb(u.h[1], u.h[2]);}
memcpy(buf+nbyte-1, &u.x, sizeof(int));
}
void si2(char* buf,int nbyte, short i)
{
union { byte h[2]; short x; } u;
u.x=i;
if(_swap) swapb(u.h[0], u.h[1]);
memcpy(buf+nbyte-1, &u.x, sizeof(short));
}
void si1(char* buf, int nbyte, char i)
{
memcpy(buf+nbyte-1,&i,sizeof(char));
}
int i4(char* buf, int nbyte)
{
int i;
union { byte h[4]; long x; } u;
memcpy(&i,buf+nbyte-1,sizeof(int));
u.x=i;
if(_swap)
swapb(u.h[0], u.h[3]); swapb(u.h[1], u.h[2]);
return u.x;
}
short i2(char* buf, int nbyte)
{
short i;
union { byte h[2]; int x; } u;
memcpy(&i,buf+nbyte-1,sizeof(short));
u.x=i;
if(_swap)
swapb(u.h[0], u.h[1]);
return u.x;
}
char i1(char* buf, int nbyte)
{
char i;
memcpy(&i,buf+nbyte-1,sizeof(char));
return i;
}