ucx: ucx/map.c@1c78cd19fb6b (annotated)

ucx/map.c@1c78cd19fb6b (annotated)

ucx/map.c

Fri, 05 Oct 2012 14:06:40 +0200

author: Mike Becker <universe@uap-core.de>
date: Fri, 05 Oct 2012 14:06:40 +0200
changeset 51: 1c78cd19fb6b
parent 48: 621a4430c404
child 52: 34f50d0bada4
permissions: -rw-r--r--

added rehashing to maps by using clone function

 /*
  *
  */
 #include <stdlib.h>
 #include <string.h>
 #include "map.h"
 UcxMap *ucx_map_new(size_t size) {
     if(size == 0) {
         size = 16;
     }
     UcxMap *map = (UcxMap*)malloc(sizeof(UcxMap));
     if(map == NULL) {
         return NULL;
     }
     map->map = (UcxMapElement**)calloc(size, sizeof(UcxMapElement*));
     if(map->map == NULL) {
         free(map);
         return NULL;
     }
     map->size = size;
     map->count = 0;
     return map;
 }
 void ucx_map_free(UcxMap *map) {
     for (size_t n = 0 ; n < map->size ; n++) {
         UcxMapElement *elem = map->map[n];
         if (elem != NULL) {
             do {
                 UcxMapElement *next = elem->next;
                 free(elem->key.data);
                 free(elem);
                 elem = next;
             } while (elem != NULL);
         }
     }
     free(map->map);
     free(map);
 }
 UcxMap *ucx_map_clone(UcxMap *map, copy_func fnc, void *data) {
     size_t bs = (map->count * 5) >> 1;
     UcxMap *newmap = ucx_map_new(bs > map->size ? bs : map->size);
     UcxMapIterator i = ucx_map_iterator(map);
     void *value;
     UCX_MAP_FOREACH(value, i) {
         ucx_map_put(newmap, i.cur->key, fnc ? fnc(value, data) : value);
     }
     return newmap;
 }
 UcxMap *ucx_map_rehash(UcxMap *map) {
     size_t load = (map->size * 3) >> 2;
     if (map->count > load) {
         UcxMap *newmap = ucx_map_clone(map, NULL, NULL);
         ucx_map_free(map);
         return newmap;
     } else {
         return map;
     }
 }
 int ucx_map_put(UcxMap *map, UcxKey key, void *data) {
     if(key.hash == 0) {
         key.hash = ucx_hash((char*)key.data, key.len);
     }
     size_t slot = key.hash%map->size;
     UcxMapElement *elm = map->map[slot];
     UcxMapElement *prev = NULL;
     while (elm != NULL && elm->key.hash < key.hash) {
         prev = elm;
         elm = elm->next;
     }
     if (elm == NULL || elm->key.hash != key.hash) {
         UcxMapElement *e = (UcxMapElement*)malloc(sizeof(UcxMapElement));
         if(e == NULL) {
             return -1;
         }
         e->key.data = NULL;
         if (prev == NULL) {
             map->map[slot] = e;
         } else {
             prev->next = e;
         }
         e->next = elm;
         elm = e;
     }
     if(elm->key.data == NULL) {
         void *kd = malloc(key.len);
         if (kd == NULL) {
             return -1;
         }
         memcpy(kd, key.data, key.len);
         key.data = kd;
         elm->key = key;
         map->count++;
     }
     elm->data = data;
     return 0;
 }
 void* ucx_map_get(UcxMap *map, UcxKey key) {
     if(key.hash == 0) {
         key.hash = ucx_hash((char*)key.data, key.len);
     }
     UcxMapElement *elm = map->map[key.hash%map->size];
     while (elm != NULL && elm->key.hash <= key.hash) {
         if(elm->key.hash == key.hash) {
             int n = (key.len > elm->key.len) ? elm->key.len : key.len;
             if (memcmp(elm->key.data, key.data, n) == 0) {
                 return elm->data;
             }
         }
         elm = elm->next;
     }
     return NULL;
 }
 UcxKey ucx_key(void *data, size_t len) {
     UcxKey key;
     key.data = data;
     key.len = len;
     key.hash = ucx_hash(data, len);
     return key;
 }
 int ucx_hash(char *data, size_t len) {
     /* murmur hash 2 */
     int m = 0x5bd1e995;
     int r = 24;
     int h = 25 ^ len;
     int i = 0;
     while (len >= 4) {
         int k = data[i + 0] & 0xFF;
         k |= (data[i + 1] & 0xFF) << 8;
         k |= (data[i + 2] & 0xFF) << 16;
         k |= (data[i + 3] & 0xFF) << 24;
         k *= m;
         k ^= k >> r;
         k *= m;
         h *= m;
         h ^= k;
         i += 4;
         len -= 4;
     }
     switch (len) {
         case 3: h ^= (data[i + 2] & 0xFF) << 16;
         /* no break */
         case 2: h ^= (data[i + 1] & 0xFF) << 8;
         /* no break */
         case 1: h ^= (data[i + 0] & 0xFF); h *= m;
         /* no break */
     }
     h ^= h >> 13;
     h *= m;
     h ^= h >> 15;
     return h;
 }
 UcxMapIterator ucx_map_iterator(UcxMap *map) {
     UcxMapIterator i;
     i.map = map;
     i.cur = NULL;
     i.index = 0;
     return i;
 }
 int ucx_map_iter_next(UcxMapIterator *i, void **elm) {
     UcxMapElement *e = i->cur;
     if(e == NULL) {
         e = i->map->map[0];
     } else {
         e = e->next;
     }
     while(i->index < i->map->size) {
         if(e != NULL) {
             if(e->data != NULL) {
                 i->cur = e;
                 *elm = e->data;
                 return 0;
             }
             e = e->next;
         } else {
             i->index++;
             if(i->index < i->map->size) {
                 e = i->map->map[i->index];
             }
         }
     }
     return 1;
 }
 int ucx_map_load_enc(UcxMap *map, FILE *f, UcxAllocator allocator,
         ucx_map_coder decoder, void* decdata) {
     int c; int r, n;
     char *key, *value;
     while ((c = fgetc(f)) > 0) {
         /* Discard leading spaces and comments */
         if (c < 33) continue;
         if (c == '#' || c == '!') {
             while ((c = (char) fgetc(f)) > 0) {
                 if (c == '\n') break;
             }
             continue;
         }
         /* read into key buffer */
         n = 16;
         key = malloc(n);
         r = 0;
         do {
             if (c == '=') break;
             if (r > n - 2) {
                 n *= 2;
                 key = realloc(key, n);
             }
             key[r] = c;
             r++;
         } while ((c = fgetc(f)) > 0);
         if (c <= 0) {
             free(key);
             return 1;
         }
         key[r] = 0;
         while (key[--r] == ' ') key[r] = 0;
         /* skip whitespaces */
         while ((c = fgetc(f)) > 0) {
             if (c > 32) break;
         }
         if (c <= 0) {
             free(key);
             return 1;
         }
         /* read into value buffer */
         n = 64;
         value = malloc(n);
         r = 0;
         do {
             if (c == '\n') break;
             if (r > n - 2) {
                 n *= 2;
                 value = realloc(value, n);
             }
             value[r] = c;
             r++;
         } while ((c = fgetc(f)) > 0);
         value[r] = 0;
         while (value[--r] < 33) value[r] = 0;
         if (decoder) {
             size_t decodedSize;
             void *decoded = decoder(value, decdata, &decodedSize);
             free(value);
             value = decoded;
             r = decodedSize;
         } else {
             r += 2;
             value = realloc(value, r);
         }
         if (allocator.pool) {
             void *pooledValue = allocator.malloc(allocator.pool, r);
             memcpy(pooledValue, value, r);
             free(value);
             value = pooledValue;
         }
         ucx_map_cstr_put(map, key, value);
         free(key);
     }
     return 0;
 }
 int ucx_map_store_enc(UcxMap *map, FILE *f,
         ucx_map_coder encoder, void *encdata) {
     UcxMapIterator iter = ucx_map_iterator(map);
     char *k, *v;
     sstr_t key, value;
     int written;
     UCX_MAP_FOREACH(v, iter) {
         k = (char*) iter.cur->key.data;
         key = sstr(k);
         if (encoder) {
             size_t encodedSize;
             void *encoded = encoder(v, encdata, &encodedSize);
             value = sstrn(encoded,encodedSize - 1);
         } else {
             value = sstr(v);
         }
         written = 0;
         written += fwrite(key.ptr, 1, key.length, f);
         written += fwrite(" = ", 1, 3, f);
         written += fwrite(value.ptr, 1, value.length, f);
         written += fwrite("\n", 1, 1, f);
         if (encoder) {
             free(value.ptr);
         }
         if (written != key.length + value.length + 4) return 1;
     }
     return 0;
 }

Mercurial > hg > ucx / annotate

ucx/map.c@1c78cd19fb6b (annotated)

ucx/map.c