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TurboPFor: Variable byte encode/decode

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2019-12-19 18:45:14 +01:00
parent 4e2705278c
commit e9531429e8
1 changed files with 52 additions and 0 deletions
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52
vint.c
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@ -239,6 +239,58 @@ unsigned TEMPLATE2(vbzgeteq, USIZE)(unsigned char **__restrict in, unsigned n, u
*in = ip;
return i;
}
unsigned char *TEMPLATE2(vbxenc, USIZE)(uint_t *__restrict in, unsigned n, unsigned char *__restrict out, uint_t start) {
uint_t *ip,v;
unsigned char *op = out;
#define VBXE { v = (*ip)^start; start=*ip++; TEMPLATE2(_vbput, USIZE)(op, v, ;); }
for(ip = in; ip != in+(n&~(UN-1)); ) { VBXE;VBXE;VBXE;VBXE; }
while(ip != in+n) VBXE; //OVERFLOWE(in,n,out,op);
return op;
}
#undef VBZE
unsigned char *TEMPLATE2(vbxdec, USIZE)(unsigned char *__restrict in, unsigned n, uint_t *__restrict out, uint_t start) {
uint_t x,*op;
#define VBXD { TEMPLATE2(_vbget, USIZE)(in, x, ;); *op++ = (start ^= x); }
for(op = out; op != out+(n&~(UN-1)); ) { VBXD; VBXD; VBXD; VBXD;
#if UN > 4
VBXD; VBXD; VBXD; VBXD;
#endif
PREFETCH(in+16*USIZE, 0);
}
while(op != out+n) VBXD;
return in;
}
#undef VBZD
uint_t TEMPLATE2(vbxgetx, USIZE)(unsigned char *__restrict in, unsigned idx, uint_t start) {
unsigned char *ip;
unsigned i;
uint_t x;
for(ip = in,i = 0; i <= idx; i++) {
TEMPLATE2(_vbget, USIZE)(ip, x, ;);
start ^= x;
}
return start;
}
unsigned TEMPLATE2(vbxgeteq, USIZE)(unsigned char **__restrict in, unsigned n, unsigned idx, uint_t key, uint_t start ) {
unsigned i;
unsigned char *ip;
uint_t x;
for(ip = *in,i=idx; i < n; i++) {
TEMPLATE2(_vbget, USIZE)(ip, x, ;);
if((start ^= x) == key)
break;
}
*in = ip;
return i;
}
#endif
unsigned char *TEMPLATE2(VBDENC, USIZE)(uint_t *__restrict in, unsigned n, unsigned char *__restrict out, uint_t start) {