chkbuf.c

/* #pragma ident "@(#)chkbuf.c  1.21 02/05/08 EDT" */

#include "edtinc.h"

#include "chkbuf.h"

/*
 * dump 64 longs
 */
void
dumpblk(ptr, index, maxindex)
u_char *ptr;
int index;
int maxindex;
{
        int *p;
        int i;

        /* test index for limits */
        if (index < 0) index = 0;
        if (index + 256 > maxindex) index = maxindex - 256;
        index = index & 0xfffffffc ; /* make an even word boundary */

        p = (int *)(&ptr[index]);
        for(i=0; i<64; i++)
        {
                if ( i % 8 == 0) printf("\n%d -\t", index + (i*4));
                printf("%08x ", *p);
                p++;
        }
        printf("\n");
}

/*
 * check buffersize -1 that each byte increments over the next
 */
int
chkbuf(unsigned char *align, int bufsize, int bufnum, int verbose)

{
        unsigned char shdbe, *p;
        int cnt;
        int err = 0;
        int firsterr = 1;

        p = align;
        shdbe = (*p+1) & 0xff; p++;
        for(cnt=1; cnt<bufsize-1; cnt++)
        {
                if (*p != shdbe)
                {
                        err++;
                        if (verbose) 
                          {
                                if (firsterr)
                                  {
                                        printf("offset %d in buffer %d was %02x, s/b %02x\n",
                                           cnt, bufnum, *p, shdbe);
                                        dumpblk(align, cnt-16, bufsize);
                                        printf("first error - hit cr to continue"); getchar();
                                  }
                                firsterr = 0;
                          }
                }
                shdbe = (*p+1) & 0xff; p++;
        }

        return err;
}

int
chkbuf_short(unsigned short *align, int bufsize, int bufnum, int verbose)

{
        unsigned short shdbe;
        int cnt;
        int err = 0;
        int firsterr = 1;

        shdbe = (align[0]+1) & 0xffff; 
        for(cnt=1; cnt<bufsize-1; cnt++)
        {
                if (align[cnt] != shdbe)
                {
                        err++;
                        if (verbose)
                          {

                                if (firsterr)
                                  {
                                        printf("offset %d in buffer %p was %04x, s/b %04x\n",
                                           cnt, align, align[cnt], shdbe);
                                        dumpblk((unsigned char *) align, 
                                                        (cnt-16) * 2, bufsize * 2);
                                        printf("first error - hit cr to continue"); getchar();
                                  }
                                firsterr = 0;
                          }
                }
                
                shdbe = (align[cnt]+1) & 0xffff; 
        }

        return err;
}

int
chkbuf_long(unsigned long *align, int bufsize, int bufnum, int verbose)

{
        unsigned long shdbe;
        int cnt;
        int err = 0;
        int firsterr = 1;

        shdbe = align[0]+1; 
        for(cnt=1; cnt<bufsize-1; cnt++)
        {
                if (align[cnt] != shdbe)
                {
                        err++;
                        if (verbose)
                          {

                                if (firsterr)
                                  {
                                        printf("offset %d in buffer %p was %08lx, s/b %08lx\n",
                                           cnt, align, align[cnt], shdbe);
                                        dumpblk((unsigned char *) align, 
                                                        (cnt-16) * 2, bufsize * 2);
                                        printf("first error - hit cr to continue"); getchar();
                                  }
                                firsterr = 0;
                          }
                }
                
                shdbe = align[cnt]+1; 
        }

        return err;
}

/*
 * find the bit alignment in a byte for incrementing bytes
 * (look for the bit that flips each time, it is the lsb)
 */
int
bitoffset(bptr)
unsigned char *bptr;
{
        int i;
        int bit;
        unsigned char *p;
        unsigned char mask, last;
        int maxbit;
        int trans;
        int maxtrans;

        mask = 0x1;
        maxbit = 0;
        maxtrans = 0;
        for(bit=0; bit< 8; bit++)
        {
                trans = 0;
                p = bptr;
                /*
                 * look at the first 9 bytes 
                 * if bufsize is less than 8 to bad
                 */
                last = *p; p++;
                for(i=0; i< 256; i++)
                {
                        if ( ((*p ^ last) & mask) != 0)
                        {
                                trans++;
                        }
                        last = *p; p++;
                }
#if 0
        printf("bit %d has %d transitions of mask %02x\n", bit, trans, mask);
#endif
                if (trans > maxtrans) 
                {
                        maxbit = bit;
                        maxtrans = trans;
                }
                mask = (mask << 1);
        }
        return(maxbit);
}

int
bitoffset32(bptr)
unsigned int *bptr;
{
        int i;
        int bit;
        unsigned int *p;
        unsigned int mask, last;
        int maxbit;
        int trans;
        int maxtrans;

        mask = 0x1;
        maxbit = 0;
        maxtrans = 0;
        for(bit=0; bit< 32; bit++)
        {
                trans = 0;
                p = bptr;
                /*
                 * look at the first 9 bytes 
                 * if bufsize is less than 8 to bad
                 */
                last = *p; p++;
                for(i=0; i< 128*1024/4; i++)
                {
                        if ( ((*p ^ last) & mask) != 0)
                        {
                                trans++;
                        }
                        last = *p; p++;
                }
#if 0
        printf("bit %d has %d transitions of mask %08x\n", bit, trans, mask);
#endif
                if (trans > maxtrans) 
                {
                        maxbit = bit;
                        maxtrans = trans;
                }
                mask = (mask << 1);
        }
        return(maxbit);
}

int
bitoffset64(bptr)
unsigned int *bptr;
{
        int i;
        int bit;
        u_longlong_t *p;
        u_longlong_t mask, last;
        int maxbit;
        int trans;
        int maxtrans;

        mask = 0x1;
        maxbit = 0;
        maxtrans = 0;
        for(bit=0; bit< 64; bit++)
        {
                trans = 0;
                p = (u_longlong_t *) bptr;
                /*
                 * look at the first 9 bytes 
                 * if bufsize is less than 8 to bad
                 */
                last = *p; p++;
                for(i=0; i< 128*1024/8; i++)
                {
                        if ( ((*p ^ last) & mask) != 0)
                        {
                                trans++;
                        }
                        last = *p; p++;
                }
#if 0
#ifdef _MSC_VER
        printf("bit %d has %d transitions of mask %I64x\n", bit, trans, mask);
#else
        printf("bit %d has %d transitions of mask %016llx\n", bit, trans, mask);
#endif
#endif
                if (trans > maxtrans) 
                {
                        maxbit = bit;
                        maxtrans = trans;
                }
                mask = (mask << 1);
        }
        return(maxbit);
}
                
/*
 * copy a buffer andshift a by n bits to the left
 * result buffer is one byte less
 * n is assumed to be less than 8
 */
void
cp_shift(from, to, shift, blen)
unsigned char *from, *to;
int shift, blen;

{
        unsigned short reg, tmp, mask;
        int i;

        /*
        printf("cp_shift from %08x to %08x shift %d length %d\n",
                from, to, shift, blen);
        */
        mask = 0xff << shift;
        reg = ( *from << 8); from++;
        /*
        printf("mask = %04x, start reg = %04x\n", mask, reg);
        */
        for(i=0; i< blen - 1; i++)
        {
                reg |= *from; from++;
                tmp = reg & mask;
                *to = (unsigned char)(tmp >> shift); to++;
                reg = reg<<8;
        }
}

void
cp_shift32(from, to, shift, blen)
unsigned int *from, *to;
int shift, blen;
{



        u_longlong_t reg, tmp, mask;
        int i;
        u_longlong_t tmp2 ;

#if 0
        printf("cp_shift32 from %08x to %08x shift %d length %d\n",
                from, to, shift, blen);
#endif
        mask = (u_longlong_t)0xffffffff << shift;
        tmp2 = (u_longlong_t)*from ;
        reg = ( tmp2 << 32); from++;
        /* printf("mask = %016llx, start reg = %016llx\n", mask, reg);*/
        for(i=0; i< blen - 1; i++)
        {
                reg |= (u_longlong_t)*from; from++;
                tmp = reg & mask;
                tmp2 = tmp >> shift ;
                *to = (unsigned int)(tmp >> shift); 
                to++;
                reg = reg<<32;
        }
}

void
cp_shift64(u_longlong_t *from, u_longlong_t *to, int shift, int blen)
{
    int i, maskshift ;
    u_longlong_t upper, lower, mask ;
    

    upper = 0 ;
    lower = 0 ;
    mask = ((u_longlong_t) 1 << (u_longlong_t) shift) - 1 ;
    maskshift = 64 - shift ;

    for (i = 0; i < blen; i++, to++, from++)
    {
        *to = upper | (*from >> shift) ;
        upper = (*from & mask) << maskshift ;

        if ((u_longlong_t)*to & 
#ifdef _MSC_VER
          (u_longlong_t)0xeeeeeeeeeeeeeeeei64) 
          printf("Bad value:  %016I64x %016I64x\n", *from, *to) ;
#else
          (u_longlong_t)0xeeeeeeeeeeeeeeeeLL) 
           printf("Bad value:  %016llx %016llx\n", *from, *to) ;
#endif
    }
}
void
intswap(u_char *buf, int size)
{
    u_longlong_t *tmpp ;
    u_longlong_t *endp ;
    tmpp = (u_longlong_t *)buf ;
    endp = tmpp + (size / 8) ;
    while (tmpp < endp)
    {
        *tmpp = iswap(*tmpp) ;
        tmpp++ ;
    }
}
u_longlong_t
iswap(u_longlong_t val)
{
#ifdef _MSC_VER
    return (
            ((val & 0x00000000ffffffffi64) << 32)
            | ((val & 0xffffffff00000000i64) >> 32));
#else
    return (
            ((val & 0x00000000ffffffffLL) << 32)
            | ((val & 0xffffffff00000000LL) >> 32));

#endif
}

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