mirror of
https://github.com/ZDoom/raze-gles.git
synced 2024-12-24 02:30:46 +00:00
Add inthashtable_t, mapping intptr_t to intptr_t.
git-svn-id: https://svn.eduke32.com/eduke32@5532 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
parent
d4dc72bac4
commit
2e968b90bf
2 changed files with 187 additions and 2 deletions
|
@ -1407,11 +1407,11 @@ int32_t loadoldboard(const char *filename, char fromwhere, vec3_t *dapos, int16_
|
|||
|
||||
// Hash functions
|
||||
|
||||
typedef struct _hashitem // size is 12/24 bytes.
|
||||
typedef struct hashitem_ // size is 12/24 bytes.
|
||||
{
|
||||
char *string;
|
||||
intptr_t key;
|
||||
struct _hashitem *next;
|
||||
struct hashitem_ *next;
|
||||
} hashitem_t;
|
||||
|
||||
typedef struct
|
||||
|
@ -1428,6 +1428,33 @@ intptr_t hash_find(const hashtable_t *t, const char *s);
|
|||
void hash_add(hashtable_t *t, const char *s, intptr_t key, int32_t replace);
|
||||
void hash_delete(hashtable_t *t, const char *s);
|
||||
|
||||
|
||||
// Hash functions
|
||||
// modified for raw binary keys and one big allocation, and maximum find() performance
|
||||
|
||||
typedef struct inthashitem_
|
||||
{
|
||||
intptr_t key;
|
||||
intptr_t value;
|
||||
struct inthashitem_ *collision; // use NULL to signify empty and pointer identity to signify end of linked list
|
||||
} inthashitem_t;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
inthashitem_t * items;
|
||||
uint32_t count;
|
||||
} inthashtable_t;
|
||||
|
||||
void inthash_init(inthashtable_t *t);
|
||||
void inthash_loop(inthashtable_t const *t, void (*func)(intptr_t, intptr_t));
|
||||
void inthash_free(inthashtable_t *t);
|
||||
intptr_t inthash_find(inthashtable_t const *t, intptr_t key);
|
||||
void inthash_add(inthashtable_t *t, intptr_t key, intptr_t value, int32_t replace);
|
||||
void inthash_delete(inthashtable_t *t, intptr_t key);
|
||||
// keep the load factor below 0.75 and make sure the size is odd
|
||||
// ideally we would find the next largest prime number
|
||||
#define INTHASH_SIZE(size) ((size * 4u / 3u) | 1u)
|
||||
|
||||
#ifdef POLYMER
|
||||
# include "polymer.h"
|
||||
#else
|
||||
|
|
|
@ -18539,6 +18539,164 @@ intptr_t hash_findcase(const hashtable_t *t, const char *s)
|
|||
return -1;
|
||||
}
|
||||
|
||||
|
||||
void inthash_init(inthashtable_t *t)
|
||||
{
|
||||
if (EDUKE32_PREDICT_FALSE(!t->count))
|
||||
{
|
||||
initputs("inthash_add(): count is zero!\n");
|
||||
return;
|
||||
}
|
||||
|
||||
inthash_free(t);
|
||||
|
||||
t->items = (inthashitem_t *)Xcalloc(t->count, sizeof(inthashitem_t));
|
||||
}
|
||||
|
||||
void inthash_loop(inthashtable_t const *t, void (*func)(intptr_t, intptr_t))
|
||||
{
|
||||
if (EDUKE32_PREDICT_FALSE(t->items == NULL))
|
||||
{
|
||||
initputs("inthash_loop(): table not initialized!\n");
|
||||
return;
|
||||
}
|
||||
|
||||
for (inthashitem_t const * item = t->items, * const items_end = t->items + t->count; item < items_end; ++item)
|
||||
func(item->key, item->value);
|
||||
}
|
||||
|
||||
void inthash_free(inthashtable_t *t)
|
||||
{
|
||||
DO_FREE_AND_NULL(t->items);
|
||||
}
|
||||
|
||||
// djb3 algorithm
|
||||
static inline uint32_t inthash_getcode(intptr_t key)
|
||||
{
|
||||
uint32_t h = 5381;
|
||||
|
||||
for (uint8_t const * keybuf = (uint8_t *)&key, * const keybuf_end = keybuf + sizeof(intptr_t); keybuf < keybuf_end; ++keybuf)
|
||||
h = ((h << 5) + h) ^ (uint32_t)*keybuf;
|
||||
|
||||
return h;
|
||||
}
|
||||
|
||||
void inthash_add(inthashtable_t *t, intptr_t key, intptr_t value, int32_t replace)
|
||||
{
|
||||
if (EDUKE32_PREDICT_FALSE(t->items == NULL))
|
||||
{
|
||||
initputs("inthash_add(): table not initialized!\n");
|
||||
return;
|
||||
}
|
||||
|
||||
inthashitem_t * seeker = t->items + inthash_getcode(key) % t->count;
|
||||
|
||||
if (seeker->collision == NULL)
|
||||
{
|
||||
seeker->key = key;
|
||||
seeker->value = value;
|
||||
seeker->collision = seeker;
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
if (seeker->key == key)
|
||||
{
|
||||
if (replace)
|
||||
seeker->value = value;
|
||||
return;
|
||||
}
|
||||
|
||||
while (seeker != seeker->collision)
|
||||
{
|
||||
seeker = seeker->collision;
|
||||
|
||||
if (seeker->key == key)
|
||||
{
|
||||
if (replace)
|
||||
seeker->value = value;
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
inthashitem_t *tail = seeker;
|
||||
|
||||
do
|
||||
tail = t->items + (tail - t->items + 1) % t->count;
|
||||
while (tail->collision != NULL && tail != seeker);
|
||||
|
||||
if (EDUKE32_PREDICT_FALSE(tail == seeker))
|
||||
{
|
||||
initputs("inthash_add(): table full!\n");
|
||||
return;
|
||||
}
|
||||
|
||||
tail->key = key;
|
||||
tail->value = value;
|
||||
tail->collision = seeker->collision = tail;
|
||||
}
|
||||
|
||||
// delete at most once
|
||||
void inthash_delete(inthashtable_t *t, intptr_t key)
|
||||
{
|
||||
if (EDUKE32_PREDICT_FALSE(t->items == NULL))
|
||||
{
|
||||
initputs("inthash_delete(): table not initialized!\n");
|
||||
return;
|
||||
}
|
||||
|
||||
inthashitem_t * seeker = t->items + inthash_getcode(key) % t->count;
|
||||
|
||||
if (seeker->collision == NULL)
|
||||
return;
|
||||
|
||||
if (seeker->key == key)
|
||||
{
|
||||
seeker->collision = NULL;
|
||||
return;
|
||||
}
|
||||
|
||||
while (seeker != seeker->collision)
|
||||
{
|
||||
inthashitem_t * const prev = seeker;
|
||||
seeker = seeker->collision;
|
||||
|
||||
if (seeker->key == key)
|
||||
{
|
||||
prev->collision = seeker == seeker->collision ? prev : seeker->collision;
|
||||
seeker->collision = NULL;
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
intptr_t inthash_find(inthashtable_t const *t, intptr_t key)
|
||||
{
|
||||
if (EDUKE32_PREDICT_FALSE(t->items == NULL))
|
||||
{
|
||||
initputs("inthash_find(): table not initialized!\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
inthashitem_t const * seeker = t->items + inthash_getcode(key) % t->count;
|
||||
|
||||
if (seeker->collision == NULL)
|
||||
return -1;
|
||||
|
||||
if (seeker->key == key)
|
||||
return seeker->value;
|
||||
|
||||
while (seeker != seeker->collision)
|
||||
{
|
||||
seeker = seeker->collision;
|
||||
|
||||
if (seeker->key == key)
|
||||
return seeker->value;
|
||||
}
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
/*
|
||||
* vim:ts=8:
|
||||
*/
|
||||
|
|
Loading…
Reference in a new issue