hashmap C语言实现

源代码(适合Linux和Windows)包括:
    hashmap.c
    hashmap.h
MSVC测试文件:
    main.c
下面是源代码,最初来自github,我改写了几个地方,并重写了全部测试代码.没有内存泄露,请放心使用.
[cpp]
/**
* hashmap.h
*/
#ifndef _HASHMAP_H_INCLUDED
#define _HASHMAP_H_INCLUDED

#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);

/**
* 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 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, 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);

#endif /* _HASHMAP_H_INCLUDED */

[cpp] view plaincopyprint?
/**
* 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, 0x220216

补充：软件开发 , C语言 ,