cachehash.c

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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <grass/raster3d.h>
#include "raster3d_intern.h"
 
/*---------------------------------------------------------------------------*/
#ifndef GRASS_RASTER3D_H
typedef struct {
 
    int nofNames;
    int *index;
    char *active;
    int lastName;
    int lastIndex;
    int lastIndexActive;
 
} Rast3d_cache_hash;
#endif
 
/*---------------------------------------------------------------------------*/
 
void Rast3d_cache_hash_reset(Rast3d_cache_hash *h)
{
    int i;
 
    for (i = 0; i < h->nofNames; i++)
        h->active[i] = 0;
 
    h->lastIndexActive = 0;
}
 
/*---------------------------------------------------------------------------*/
 
void Rast3d_cache_hash_dispose(Rast3d_cache_hash *h)
{
    if (h == NULL)
        return;
 
    if (h->index != NULL)
        Rast3d_free(h->index);
    if (h->active != NULL)
        Rast3d_free(h->active);
    Rast3d_free(h);
}
 
/*---------------------------------------------------------------------------*/
 
void *Rast3d_cache_hash_new(int nofNames)
{
    Rast3d_cache_hash *tmp;
 
    tmp = (Rast3d_cache_hash *)Rast3d_malloc(sizeof(Rast3d_cache_hash));
    if (tmp == NULL) {
        Rast3d_error("Rast3d_cache_hash_new: error in Rast3d_malloc");
        return (void *)NULL;
    }
 
    tmp->nofNames = nofNames;
    tmp->index = (int *)Rast3d_malloc(tmp->nofNames * sizeof(int));
    tmp->active = (char *)Rast3d_malloc(tmp->nofNames * sizeof(char));
    if ((tmp->index == NULL) || (tmp->active == NULL)) {
        Rast3d_cache_hash_dispose(tmp);
        Rast3d_error("Rast3d_cache_hash_new: error in Rast3d_malloc");
        return (void *)NULL;
    }
 
    Rast3d_cache_hash_reset(tmp);
 
    return tmp;
}
 
/*---------------------------------------------------------------------------*/
 
void Rast3d_cache_hash_remove_name(Rast3d_cache_hash *h, int name)
{
    if (name >= h->nofNames)
        Rast3d_fatal_error(
            "Rast3d_cache_hash_remove_name: name %i out of range", name);
 
    if (h->active[name] == 0)
        Rast3d_fatal_error(
            "Rast3d_cache_hash_remove_name: name %i not in hashtable", name);
 
    h->active[name] = 0;
    if (name == h->lastName)
        h->lastIndexActive = 0;
}
 
/*---------------------------------------------------------------------------*/
 
void Rast3d_cache_hash_load_name(Rast3d_cache_hash *h, int name, int index)
{
    if (name >= h->nofNames)
        Rast3d_fatal_error("Rast3d_cache_hash_load_name: name out of range");
 
    if (h->active[name] != 0)
        Rast3d_fatal_error(
            "Rast3d_cache_hash_load_name: name already in hashtable");
 
    h->index[name] = index;
    h->active[name] = 1;
}
 
/*---------------------------------------------------------------------------*/
 
int Rast3d_cache_hash_name2index(Rast3d_cache_hash *h, int name)
{
    int index;
 
    if (h->lastIndexActive)
        if (h->lastName == name)
            return h->lastIndex;
 
    if (!h->active[name])
        return -1;
 
    index = h->index[name];
 
    h->lastName = name;
    h->lastIndex = index;
    h->lastIndexActive = 1;
 
    return index;
}