hashmap.c

/*
 * Generic map implementation.
 */
#include "hashmap.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define INITIAL_SIZE (256)

/* We need to keep keys and values */
typedef struct _hashmap_element{
  char* key;
  int in_use;
  any_t data;
  struct _hashmap_element *next;
} hashmap_element;

/* A hashmap has some maximum size and current size,
 * as well as the data to hold. */
typedef struct _hashmap_map{
  int table_size;
  int size;
  hashmap_element *data;
  int iterator;
  int iterator_lower;
} hashmap_map;

/*
 * Return an empty hashmap, or NULL on failure.
 */
map_t hashmap_new() {
  hashmap_map* m = (hashmap_map*) malloc(sizeof(hashmap_map));
  if(!m) goto err;

  m->data = (hashmap_element*) calloc(INITIAL_SIZE, sizeof(hashmap_element));
  if(!m->data) goto err;

  m->table_size = INITIAL_SIZE;
  m->size = 0;

  return m;
err:
  if (m)
    hashmap_free(m);
  return NULL;
}

/* The implementation here was originally done by Gary S. Brown.  I have
   borrowed the tables directly, and made some minor changes to the
   crc32-function (including changing the interface). //ylo */

  /* ============================================================= */
  /*  COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or       */
  /*  code or tables extracted from it, as desired without restriction.     */
  /*                                                                        */
  /*  First, the polynomial itself and its table of feedback terms.  The    */
  /*  polynomial is                                                         */
  /*  X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0   */
  /*                                                                        */
  /*  Note that we take it "backwards" and put the highest-order term in    */
  /*  the lowest-order bit.  The X^32 term is "implied"; the LSB is the     */
  /*  X^31 term, etc.  The X^0 term (usually shown as "+1") results in      */
  /*  the MSB being 1.                                                      */
  /*                                                                        */
  /*  Note that the usual hardware shift register implementation, which     */
  /*  is what we're using (we're merely optimizing it by doing eight-bit    */
  /*  chunks at a time) shifts bits into the lowest-order term.  In our     */
  /*  implementation, that means shifting towards the right.  Why do we     */
  /*  do it this way?  Because the calculated CRC must be transmitted in    */
  /*  order from highest-order term to lowest-order term.  UARTs transmit   */
  /*  characters in order from LSB to MSB.  By storing the CRC this way,    */
  /*  we hand it to the UART in the order low-byte to high-byte; the UART   */
  /*  sends each low-bit to hight-bit; and the result is transmission bit   */
  /*  by bit from highest- to lowest-order term without requiring any bit   */
  /*  shuffling on our part.  Reception works similarly.                    */
  /*                                                                        */
  /*  The feedback terms table consists of 256, 32-bit entries.  Notes:     */
  /*                                                                        */
  /*      The table can be generated at runtime if desired; code to do so   */
  /*      is shown later.  It might not be obvious, but the feedback        */
  /*      terms simply represent the results of eight shift/xor opera-      */
  /*      tions for all combinations of data and CRC register values.       */
  /*                                                                        */
  /*      The values must be right-shifted by eight bits by the "updcrc"    */
  /*      logic; the shift must be unsigned (bring in zeroes).  On some     */
  /*      hardware you could probably optimize the shift in assembler by    */
  /*      using byte-swap instructions.                                     */
  /*      polynomial $edb88320                                              */
  /*                                                                        */
  /*  --------------------------------------------------------------------  */

static unsigned long crc32_tab[] = {
  0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
  0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
  0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
  0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
  0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
  0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
  0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
  0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
  0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
  0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
  0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
  0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
  0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
  0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
  0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
  0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
  0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
  0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
  0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
  0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
  0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
  0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
  0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
  0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
  0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
  0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
  0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
  0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
  0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
  0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
  0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
  0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
  0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
  0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
  0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
  0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
  0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
  0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
  0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
  0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
  0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
  0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
  0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
  0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
  0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
  0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
  0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
  0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
  0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
  0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
  0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
  0x2d02ef8dL
};

/* Return a 32-bit CRC of the contents of the buffer. */

unsigned long crc32(const unsigned char *s, unsigned int len)
{
  unsigned int i;
  unsigned long crc32val;

  crc32val = 0;
  for (i = 0;  i < len;  i ++)
  {
    crc32val =
      crc32_tab[(crc32val ^ s[i]) & 0xff] ^
      (crc32val >> 8);
  }
  return crc32val;
}

/*
 * Hashing function for a string
 */
unsigned int hashmap_hash_int(hashmap_map * m, char* keystring){

  unsigned long key = crc32((unsigned char*)(keystring), strlen(keystring));

  /* Robert Jenkins' 32 bit Mix Function */
  key += (key << 12);
  key ^= (key >> 22);
  key += (key << 4);
  key ^= (key >> 9);
  key += (key << 10);
  key ^= (key >> 2);
  key += (key << 7);
  key ^= (key >> 12);

  /* Knuth's Multiplicative Method */
  key = (key >> 3) * 2654435761;

  return key % m->table_size;
}

/*
 * Return the pointer to the element to use for the key, or NULL to request
 * a larger table.
 */
hashmap_element* hashmap_hash(map_t in, char* key){
  int hash;
  hashmap_element *e, *p;

  /* Cast the hashmap */
  hashmap_map* m = (hashmap_map *) in;

  /* If full, return immediately */
  if(m->size >= (m->table_size/2)) return NULL;

  /* Find the best index */
  hash = hashmap_hash_int(m, key);

  e = &m->data[hash];
  if (e->in_use == 0)
    return e;

  /* Linear probing - check if the key exists */
  while (e != NULL) {
    if (strcmp(e->key,key)==0)
      return e;

    p = e;
    e = e->next;
  }

  p->next = calloc(1, sizeof(hashmap_element));
  p->next->next = NULL;
  return p->next;
}

/*
 * Doubles the size of the hashmap, and rehashes all the elements
 */
int hashmap_rehash(map_t in){
  int i;
  int old_size;
  hashmap_element* curr;
  hashmap_element *e, *p;

  /* Setup the new elements */
  hashmap_map *m = (hashmap_map *) in;
  hashmap_element* temp = (hashmap_element *)
    calloc(2 * m->table_size, sizeof(hashmap_element));
  if(!temp) return MAP_OMEM;

  /* Update the array */
  curr = m->data;
  m->data = temp;

  /* Update the size */
  old_size = m->table_size;
  m->table_size = 2 * m->table_size;
  m->size = 0;

  /* Rehash the elements */
  for(i = 0; i < old_size; i++){
    int first = 1;

    if (curr[i].in_use == 0)
      continue;

    e = &curr[i];
    while (e != NULL) {
      int status;

      status = hashmap_put(m, e->key, e->data);
      if (status != MAP_OK)
        return status;

      p = e;
      e = e->next;

      if (first == 0)
        free(p);
      first = 0;
    }
  }

  free(curr);

  return MAP_OK;
}

/*
 * Add a pointer to the hashmap with some key
 */
int hashmap_put(map_t in, char* key, any_t value){
  hashmap_element *e;
  hashmap_map* m;

  /* Cast the hashmap */
  m = (hashmap_map *) in;

  /* Find a place to put our value */
  e = hashmap_hash(in, key);
  while(e == NULL){
    if (hashmap_rehash(in) == MAP_OMEM) {
      return MAP_OMEM;
    }
    e = hashmap_hash(in, key);
  }

  /* Set the data */
  e->data = value;
  e->key = key;
  e->in_use = 1;

  m->size++; 

  return MAP_OK;
}

/*
 * Get your pointer out of the hashmap with a key
 */
int hashmap_get(map_t in, char* key, any_t *arg){
  int curr;
  hashmap_map* m;
  hashmap_element *e;

  /* Cast the hashmap */
  m = (hashmap_map *) in;

  /* Find data location */
  curr = hashmap_hash_int(m, key);

  if (arg != NULL)
    *arg = NULL;

  e = &m->data[curr];
  if (e->in_use == 0)
    return MAP_MISSING;

  /* Linear probing, if necessary */
  while (e != NULL) {
    if (strcmp(e->key,key)==0){
      if (arg != NULL)
        *arg = e->data;
      return MAP_OK;
    }
    e = e->next;
  }

  /* Not found */
  return MAP_MISSING;
}

any_t hashmap_begin_iteration(map_t in) {
  int i;

  /* Cast the hashmap */
  hashmap_map* m = (hashmap_map*) in;

  /* On empty hashmap, return immediately */
  if (hashmap_length(m) <= 0)
    return NULL;	

  /* Linear probing */
  for(i = 0; i< m->table_size; i++) {
    if(m->data[i].in_use != 0) {
      m->iterator = i;
      m->iterator_lower = 1;
      return m->data[i].data;
    }
  }

  return NULL;
}

any_t hashmap_next_iteration(map_t in) {
  int i,j;

  hashmap_element* e;

  /* Cast the hashmap */
  hashmap_map* m = (hashmap_map*) in;

  /* Linear probing */
  for(i = m->iterator; i< m->table_size; i++) {
    e = &m->data[i];

    if (e->in_use == 0)
      continue;

    for (j = 0; j < m->iterator_lower; j++)
      e = e->next;
    if (e == NULL) {
      m->iterator_lower = 0;
      continue;
    }
    m->iterator = i;
    m->iterator_lower++;
    return e->data;
  }

  return NULL;
}

/*
 * Remove an element with that key from the map
 */
int hashmap_remove(map_t in, char* key){
  int curr;
  hashmap_map* m;
  hashmap_element *e, *p;

  /* Cast the hashmap */
  m = (hashmap_map *) in;

  /* Find key */
  curr = hashmap_hash_int(m, key);

  e = &m->data[curr];
  if (e->in_use == 0)
    return MAP_MISSING;

  /* Linear probing, if necessary */
  p = NULL;
  while (e != NULL) {
    if (strcmp(e->key,key)==0){
      /* Blank out the fields */
      e->in_use = 0;
      e->data = NULL;
      e->key = NULL;

      if (p != NULL) {
        p->next = e->next;
        free(e);
      }
      else {
        /* Located in the big array, not floating memory */
        if (e->next != NULL) {
          hashmap_element *tmp = e->next;
          memcpy(e, e->next, sizeof(hashmap_element));
          free(tmp);
        }
      }

      /* Reduce the size */
      m->size--;
      return MAP_OK;
    }
    p = e;
    e = e->next;
  }

  /* Data not found */
  return MAP_MISSING;
}

/* Deallocate the hashmap */
void hashmap_free(map_t in){
  hashmap_map* m = (hashmap_map*) in;
  hashmap_element *e, *p;
  int i;

  for (i = 0; i < m->table_size; i++) {
    int first = 1;

    e = &m->data[i];
    if (e->in_use == 0)
      continue;
    while (e != NULL) {
      p = e;
      e = e->next;
      if (first == 0)
        free(p);
      first = 0;
    }
  }

  free(m->data);
  free(m);
}

/* free all elements */
void hashmap_free_all_elements(map_t in){
  any_t *e;

  e = hashmap_begin_iteration(in);
  while (e != NULL) {
    free(e);
    e = hashmap_next_iteration(in);
  }
}

/* Return the length of the hashmap */
int hashmap_length(map_t in){
  hashmap_map* m = (hashmap_map *) in;
  if(m != NULL) return m->size;
  else return 0;
}