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#include "mtable.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#define mtable_left_index(k, e) ((~((1<<(e))-1) & (k))>>(e))
#define mtable_right_index(k, e) (((1<<(e))-1) & (k))
static void *
mallocc(size_t size)
{
void *p = malloc(size);
if(p == NULL) {
fprintf(stderr, "out of memory\n");
abort();
}
return p;
}
static mtable_t
mtable_new2(int *exponents)
{
void **p = mallocc(sizeof(void *) * (1 + (1<<exponents[0])));
p[0] = exponents;
memset(p+1, 0, sizeof(void *) * (1<<exponents[0]));
return (mtable_t) p;
}
mtable_t
mtable_new(int *exponents)
{
int n;
int *exponents_copy;
for(n=0; exponents[n++] != 0; );
exponents_copy = mallocc(sizeof(int) * n);
while(n > 0) {
n--;
exponents_copy[n] = exponents[n];
}
return mtable_new2(exponents_copy);
}
static void
mtable_delete2(mtable_t mtab, int e_sum, int start)
{
if(mtab->exponents[1] != 0) {
int k;
int e = mtab->exponents[0];
void **p = &(mtab->slots[0]);
for(k=0; k<(1<<e); k++) {
if(*p != NULL)
mtable_delete2(*p, e_sum-e, start+(k<<(e_sum-e)));
p++;
}
}
free(mtab);
}
void
mtable_delete(mtable_t mtab)
{
int i, e_sum=0, *exponents;
for(i=0; mtab->exponents[i] != 0; i++)
e_sum += mtab->exponents[i];
exponents = mtab->exponents;
mtable_delete2(mtab, e_sum, 0);
free(exponents);
}
#if 0
static void
mtable_change_exponents(mtable_t mtab, int *exponents)
{
if(mtab->exponents[1] != 0) {
int k;
int e = mtab->exponents[0];
void **p = &(mtab->slots[0]);
for(k=0; k<(1<<e); k++) {
if(*p != NULL)
mtable_change_exponents(*p, exponents+1);
p++;
}
}
mtab->exponents = exponents;
}
mtable_t
mtable_extend(mtable_t mtab, int *exponents)
{
struct mtable *p;
int *all_exponents, *old_exponents;
int n = 0;
int i = 0;
for(n=0; exponents[n++] != 0; );
for(i=0; mtab->exponents[i++] != 0; );
all_exponents = mallocc(sizeof(int) * (n-1+i));
for(i=0; exponents[i] != 0; i++)
all_exponents[i] = exponents[i];
for(i=0; mtab->exponents[i] != 0; i++)
all_exponents[n-1+i] = mtab->exponents[i];
all_exponents[n-1+i] = 0;
p = mtable_new2(exponents);
mtable_set(p, 0, mtab);
old_exponents = mtab->exponents;
mtable_change_exponents(p, all_exponents);
mtable_change_exponents(mtab, all_exponents+n-1);
free(old_exponents);
return p;
}
#endif
void
mtable_set(mtable_t mtab, mtable_key key, void *data)
{
int i, e=0;
struct mtable *p;
mtable_key k;
for(i=0; mtab->exponents[i] != 0; i++)
e += mtab->exponents[i];
p = mtab;
k = key;
for(;;) {
if(p->exponents[1] == 0) {
p->slots[k] = data;
return;
} else {
e -= p->exponents[0];
i = mtable_left_index(k, e);
k = mtable_right_index(k, e);
if(p->slots[i] == NULL)
p->slots[i] = mtable_new2(p->exponents+1);
p = p->slots[i];
}
}
}
void
*mtable_get(mtable_t mtab, mtable_key key)
{
int i, e=0;
struct mtable *p;
mtable_key k;
for(i=0; mtab->exponents[i] != 0; i++)
e += mtab->exponents[i];
p = mtab;
k = key;
while(p != NULL) {
if(p->exponents[1] == 0) {
return p->slots[k];
} else {
e -= p->exponents[0];
i = mtable_left_index(k, e);
k = mtable_right_index(k, e);
p = p->slots[i];
}
}
return NULL;
}
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