Implement cheungmine in hashmap C
Source code (applicable to Linux and Windows) includes:
Hashmap. c
Hashmap. h
Msvc test file:
Main. c
The following is the source code. It was originally from GitHub. I have rewritten several places and rewritten all the test code. No Memory leakage. Please feel free to use it.
/** * hashmap.h */#ifndef _HASHMAP_H_INCLUDED#define _HASHMAP_H_INCLUDED#if defined(__cplusplus)extern "C" {#endif#define HMAP_E_KEYUSED (-5) /* Key already existed */#define HMAP_E_OUTMEM (-4) /* Out of Memory */#define HMAP_E_NOTFOUND (-3) /* No such element */#define HMAP_E_OVERFLOW (-2) /* Hashmap is full */#define HMAP_E_FAIL (-1) /* Hashmap api fail */#define HMAP_S_OK (0) /* Success *//** * void_ptr is a pointer. This allows you to put arbitrary structures in the hashmap. */typedef void* void_ptr;/** * hmap_t is a pointer to an internally maintained data structure. * Clients of this package do not need to know how hashmaps are * represented. They see and manipulate only hmap_t's. */typedef void_ptr hmap_t;/** * hmap_callback_func is a pointer to a function that can take two void_ptr arguments * and return an integer. Returns status code.. */typedef int (*hmap_callback_func)(void_ptr, void_ptr);/** * prototype for map element type */typedef struct _hmap_pair_t { char *key; void_ptr data;} hmap_pair_t;/** * Return an empty hashmap. Returns NULL if empty. */extern hmap_t hashmap_create();/** * Iteratively call fn with argument (value, arg) for each element data * in the hashmap. The function returns anything other than HMAP_S_OK * the traversal is terminated. fn must not modify any hashmap functions. */extern int hashmap_iterate(hmap_t in, hmap_callback_func fnIterValue, void_ptr arg);/** * Add an element to the hashmap. * Return HMAP_S_OK, HMAP_E_KEYUSED or HMAP_E_OUTMEM. */extern int hashmap_put(hmap_t in, char* key, void_ptr elem);/** * Get an element from the hashmap. Return HMAP_S_OK or HMAP_E_NOTFOUND. */extern int hashmap_get(hmap_t in, const char* key, void_ptr *elem);/** * Remove an element from the hashmap. Return HMAP_S_OK or HMAP_E_NOTFOUND. */extern int hashmap_remove(hmap_t in, char* key, void_ptr *outValue);/** * Free the hashmap */extern void hashmap_destroy(hmap_t in, hmap_callback_func fnFreeValue, void_ptr arg);/** * Get the current size of a hashmap */extern int hashmap_size(hmap_t in);#if defined(__cplusplus)}#endif#endif /* _HASHMAP_H_INCLUDED */
/** * hashmap.c * Generic hash map implementation. */#include "hashmap.h"#include <stdlib.h>#include <stdio.h>#include <string.h>#define HMAP_INITIAL_SIZE (256)#define HMAP_CHAIN_LENGTH (8)typedef enum _use_state { unused_0 = 0, used_1 = 1} use_state;/* A element to keep keys and values */typedef struct _hashmap_elem_t{ char *key; /* pointer to actual key storage */ use_state used; /* unused_0, used_1 */ void_ptr data; /* pointer to value memory allocated by callee */} hashmap_elem_t;/* A hashmap has maximum size and current size, as well as the elems to hold */typedef struct _hashmap_map_t{ int table_size; int size; hashmap_elem_t *elems;} hashmap_map_t;/** * The implementation here was originally done by Gary S. Brown. * I have borrowed the tables directly, and made some minor changes. * * COPYRIGHT (C) 1986 Gary S. Brown. * You may use this program, or code or tables extracted from it, * as desired without restriction. */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. */static unsigned long crc32(const unsigned char *s, unsigned int len){ unsigned int i; unsigned long crc32val = 0; for (i = 0; i < len; i ++) { crc32val = crc32_tab[(crc32val ^ s[i]) & 0xff] ^ (crc32val >> 8); } return crc32val;}/** * Hashing function for a string */static unsigned int _find_hash_index(hashmap_map_t * m, const char* keystring){ unsigned long key = crc32(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) * 0x9E3779B1; return key % m->table_size;}/** * Return the integer of the location in data to store the point to the item, * or HMAP_E_OVERFLOW. */static int _hashmap_hash(hmap_t in, char* key){ int curr; int i; hashmap_elem_t *elem; hashmap_map_t *m = (hashmap_map_t *) in; /* If full, return immediately */ if (m->size >= (m->table_size/2)) { return HMAP_E_OVERFLOW; } /* Find the best index */ curr = _find_hash_index(m, key); /* Linear probing */ for (i = 0; i< HMAP_CHAIN_LENGTH; i++) { elem = m->elems + curr; if(elem->used == unused_0) { return curr; } if(elem->used == used_1 && (!strcmp(elem->key, key))) { return curr; } curr = (curr + 1) % m->table_size; } return HMAP_E_OVERFLOW;}/** * Doubles the size of the hashmap, and rehashes all the elements */static int _hashmap_rehash(hmap_t in){ int i; int old_size; hashmap_elem_t *curr; hashmap_elem_t *elem; /* Setup the new elements */ hashmap_map_t *m = (hashmap_map_t *) in; hashmap_elem_t *temp = (hashmap_elem_t *) calloc(2 * m->table_size, sizeof(hashmap_elem_t)); if (!temp) { return HMAP_E_OUTMEM; } /* Update the array */ curr = m->elems; m->elems = 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 status; elem = curr + i; if (elem->used == unused_0) { continue; } status = hashmap_put(m, elem->key, elem->data); if (status != HMAP_S_OK) { return status; } } free(curr); return HMAP_S_OK;}/** * Create an empty hashmap */hmap_t hashmap_create() { hashmap_map_t* m = (hashmap_map_t*) malloc(sizeof(hashmap_map_t)); if (!m) { exit(HMAP_E_OUTMEM); } m->elems = (hashmap_elem_t*) calloc(HMAP_INITIAL_SIZE, sizeof(hashmap_elem_t)); if (!m->elems) { free(m); exit(HMAP_E_OUTMEM); } m->table_size = HMAP_INITIAL_SIZE; m->size = 0; return m;}/** * Add a pair of key-value to the hashmap */int hashmap_put(hmap_t in, char* key, void_ptr value){ int index; hashmap_map_t *m; hashmap_elem_t *elem; m = (hashmap_map_t *) in; /* Find a place to put our value */ index = _hashmap_hash(in, key); while (index == HMAP_E_OVERFLOW) { if (_hashmap_rehash(in) == HMAP_E_OUTMEM) { return HMAP_E_OUTMEM; } index = _hashmap_hash(in, key); } /* Set the elems */ elem = m->elems + index; if (elem->used == used_1) { /* Find a repeated key */ return HMAP_E_KEYUSED; } elem->data = value; elem->key = key; /* only set to a reference */ elem->used = used_1; m->size++; return HMAP_S_OK;}/** * Get your pointer out of the hashmap with a key */int hashmap_get(hmap_t in, const char* key, void_ptr *value){ int curr; int i; hashmap_map_t *m; hashmap_elem_t *elem; m = (hashmap_map_t *) in; /* Find element location */ curr = _find_hash_index(m, key); /* Linear probing, if necessary */ for (i = 0; i<HMAP_CHAIN_LENGTH; i++){ elem = m->elems + curr; if (elem->used == used_1) { if (!strcmp(elem->key, key)) { *value = (elem->data); return HMAP_S_OK; } } curr = (curr + 1) % m->table_size; } *value = NULL; return HMAP_E_NOTFOUND;}/** * Iterate the function parameter over each element in the hashmap. The * additional void_ptr argument is passed to the function as its first * argument and the hashmap element is the second. */int hashmap_iterate(hmap_t in, hmap_callback_func fnIterValue, void_ptr arg) { int i; hashmap_elem_t *elem; hashmap_map_t *m = (hashmap_map_t*) in; if (hashmap_size(m) <= 0) { return HMAP_E_NOTFOUND; } for (i = 0; i< m->table_size; i++) { elem = m->elems+i; if(elem->used == used_1) { int status = fnIterValue(elem->data, arg); if (status != HMAP_S_OK) { return status; } } } return HMAP_S_OK;}/** * Remove an element with that key from the map */int hashmap_remove(hmap_t in, char* key, void_ptr *outValue){ int i, curr; hashmap_map_t* m; hashmap_elem_t *elem; /* Cast the hashmap */ m = (hashmap_map_t *) in; if (outValue) { *outValue = NULL; } /* Find key */ curr = _find_hash_index(m, key); /* Linear probing, if necessary */ for (i = 0; i<HMAP_CHAIN_LENGTH; i++){ elem = m->elems + curr; if (elem->used == used_1){ if (!strcmp(elem->key, key)){ /* Blank out the fields */ elem->used = unused_0; elem->key = NULL; if (outValue) { *outValue = elem->data; } elem->data = NULL; /* Reduce the size */ m->size--; return HMAP_S_OK; } } curr = (curr + 1) % m->table_size; } /* Data not found */ return HMAP_E_NOTFOUND;}/** * Deallocate the hashmap */void hashmap_destroy(hmap_t in, hmap_callback_func fnFreeValue, void_ptr arg){ hashmap_elem_t *elem; void_ptr data; hashmap_map_t* m = (hashmap_map_t*) in; while (m->table_size-->0) { elem = m->elems+(m->table_size); if (elem->used == used_1) { elem->used = unused_0; elem->key = NULL; data = elem->data; elem->data = NULL; if (fnFreeValue) { fnFreeValue(data, arg); } } } free(m->elems); free(m);}/** * Return the length of the hashmap */int hashmap_size(hmap_t in){ hashmap_map_t* m = (hashmap_map_t *) in; if (m) { return m->size; } else { return 0; }}
/*** Main. c ** detecting memory leaks only for Windows. * place the following snippet where leak to be tested: * # If defined (_ crtdbg_map_alloc) * _ crtdumpmemoryleaks (); * # endif */# If defined (win32) & defined (_ Debug) # ifndef _ crtdbg_map_alloc # pragma message (_ file _ ": _ crtdbg_map_alloc defined only for Debug on win32 .") # DEFINE _ crtdbg_map_alloc # include <stdlib. h> # include <crtdbg. h> # endif # include <assert. h> # include <stdio. h> # include <string. h> # include "hashmap. H "typedef struct userelem_t {char key [20]; char * value;} userelem; typedef struct userdata_t {char name [20]; hmap_t map; /* userelem map */} userdata; static int iter_elem (void * ELEM, void * Arg) {userelem * El = (userelem *) ELEM; printf ("Key = % s; value = % s \ n ", El-> key, El-> value); Return 0;} static int free_elem (void * ELEM, void * Arg) {userelem * El = (userelem *) ELEM; free (El-> value); free (EL); Return 0;} static int free_data (void * data, void * Arg) {userdata * dat = (userdata *) data;/* Delete the entire sub-map */hashmap_destroy (dat-> map, free_elem, 0); free (DAT); Return 0 ;} int main (INT argc, char * argv []) {hmap_t map; userdata * dat; userelem * El; int ret, I, j; /* Create hashmap */map = hashmap_create ();/* Insert the hashmap element */for (I = 0; I <100; I ++) {dat = (userdata *) malloc (sizeof (userdata);/* create a sub-hashmap */dat-> map = hashmap_create ();/* Insert a sub-hashmap element */For (j = 0; j <10; j ++) {El = (userelem *) malloc (sizeof (userelem); sprintf (El-> key, "% d", J ); el-> value = (char *) malloc (30); sprintf (El-> value, "% d", J + 1000); ret = hashmap_put (dat-> map, el-> key, El); Assert (ret = hmap_s_ OK);} sprintf (dat-> name, "% d", I); ret = hashmap_put (map, dat-> name, dat); Assert (ret = hmap_s_ OK);} printf ("hashmap_size: % d \ n", hashmap_size (MAP);/* delete a specified element: key = "10" */ret = hashmap_remove (MAP, "10", & dat); Assert (ret = hmap_s_ OK); printf ("hashmap_remove: Name = % S. size = % d \ n ", dat-> name, hashmap_size (MAP); hashmap_iterate (dat-> map, iter_elem, 0); free_data (dat, 0 ); /* Delete the specified element: Key = "11" */ret = hashmap_remove (MAP, "11", & dat); Assert (ret = hmap_s_ OK); printf ("hashmap_remove: name = % S. size = % d \ n ", dat-> name, hashmap_size (MAP); hashmap_iterate (dat-> map, iter_elem, 0); free_data (dat, 0 ); /* query element: Key = "99" */ret = hashmap_get (MAP, "99", & dat); Assert (ret = hmap_s_ OK); printf ("hashmap_get: name = % S. size = % d \ n ", dat-> name, hashmap_size (MAP); hashmap_iterate (dat-> map, iter_elem, 0 ); /* Delete the entire map */hashmap_destroy (MAP, free_data, 0); _ crtdumpmemoryleaks (); Return 0 ;}