136 lines
4.0 KiB
Plaintext
136 lines
4.0 KiB
Plaintext
CMPH - Examples
|
|
|
|
|
|
%!includeconf: CONFIG.t2t
|
|
|
|
Using cmph is quite simple. Take a look in the following examples.
|
|
|
|
-------------------------------------------------------------------
|
|
|
|
```
|
|
#include <cmph.h>
|
|
#include <string.h>
|
|
// Create minimal perfect hash function from in-memory vector
|
|
int main(int argc, char **argv)
|
|
{
|
|
// Creating a filled vector
|
|
const char *vector[] = {"aaaaaaaaaa", "bbbbbbbbbb", "cccccccccc", "dddddddddd", "eeeeeeeeee",
|
|
"ffffffffff", "gggggggggg", "hhhhhhhhhh", "iiiiiiiiii", "jjjjjjjjjj"};
|
|
unsigned int nkeys = 10;
|
|
// Source of keys
|
|
cmph_io_adapter_t *source = cmph_io_vector_adapter((char **)vector, nkeys);
|
|
|
|
//Create minimal perfect hash function using the default (chm) algorithm.
|
|
cmph_config_t *config = cmph_config_new(source);
|
|
cmph_t *hash = cmph_new(config);
|
|
cmph_config_destroy(config);
|
|
|
|
//Find key
|
|
const char *key = "jjjjjjjjjj";
|
|
unsigned int id = cmph_search(hash, key, strlen(key));
|
|
fprintf(stderr, "Id:%u\n", id);
|
|
//Destroy hash
|
|
cmph_destroy(hash);
|
|
cmph_io_vector_adapter_destroy(source);
|
|
return 0;
|
|
}
|
|
```
|
|
Download [vector_adapter_ex1.c examples/vector_adapter_ex1.c]. This example does not work in versions below 0.3.
|
|
-------------------------------
|
|
|
|
```
|
|
#include <cmph.h>
|
|
#include <string.h>
|
|
// Create minimal perfect hash function from in-memory vector
|
|
|
|
#pragma pack(1)
|
|
typedef struct {
|
|
cmph_uint32 id;
|
|
char key[11];
|
|
cmph_uint32 year;
|
|
} rec_t;
|
|
#pragma pack(0)
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
// Creating a filled vector
|
|
unsigned int i = 0;
|
|
rec_t vector[10] = {{1, "aaaaaaaaaa", 1999}, {2, "bbbbbbbbbb", 2000}, {3, "cccccccccc", 2001},
|
|
{4, "dddddddddd", 2002}, {5, "eeeeeeeeee", 2003}, {6, "ffffffffff", 2004},
|
|
{7, "gggggggggg", 2005}, {8, "hhhhhhhhhh", 2006}, {9, "iiiiiiiiii", 2007},
|
|
{10,"jjjjjjjjjj", 2008}};
|
|
unsigned int nkeys = 10;
|
|
FILE* mphf_fd = fopen("temp_struct_vector.mph", "w");
|
|
// Source of keys
|
|
cmph_io_adapter_t *source = cmph_io_struct_vector_adapter(vector, sizeof(rec_t), sizeof(cmph_uint32), 11, nkeys);
|
|
|
|
//Create minimal perfect hash function using the default (chm) algorithm.
|
|
cmph_config_t *config = cmph_config_new(source);
|
|
cmph_config_set_algo(config, CMPH_BDZ);
|
|
cmph_config_set_mphf_fd(config, mphf_fd);
|
|
cmph_t *hash = cmph_new(config);
|
|
cmph_config_destroy(config);
|
|
cmph_dump(hash, mphf_fd);
|
|
cmph_destroy(hash);
|
|
fclose(mphf_fd);
|
|
|
|
//Find key
|
|
mphf_fd = fopen("temp_struct_vector.mph", "r");
|
|
hash = cmph_load(mphf_fd);
|
|
while (i < nkeys) {
|
|
const char *key = vector[i].key;
|
|
unsigned int id = cmph_search(hash, key, 11);
|
|
fprintf(stderr, "key:%s -- hash:%u\n", key, id);
|
|
i++;
|
|
}
|
|
|
|
//Destroy hash
|
|
cmph_destroy(hash);
|
|
cmph_io_vector_adapter_destroy(source);
|
|
fclose(mphf_fd);
|
|
return 0;
|
|
}
|
|
```
|
|
Download [struct_vector_adapter_ex3.c examples/struct_vector_adapter_ex3.c]. This example does not work in versions below 0.7.
|
|
-------------------------------
|
|
|
|
```
|
|
#include <cmph.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
// Create minimal perfect hash function from in-disk keys using BMZ algorithm
|
|
int main(int argc, char **argv)
|
|
{
|
|
//Open file with newline separated list of keys
|
|
FILE * keys_fd = fopen("keys.txt", "r");
|
|
cmph_t *hash = NULL;
|
|
if (keys_fd == NULL)
|
|
{
|
|
fprintf(stderr, "File \"keys.txt\" not found\n");
|
|
exit(1);
|
|
}
|
|
// Source of keys
|
|
cmph_io_adapter_t *source = cmph_io_nlfile_adapter(keys_fd);
|
|
|
|
cmph_config_t *config = cmph_config_new(source);
|
|
cmph_config_set_algo(config, CMPH_BMZ);
|
|
hash = cmph_new(config);
|
|
cmph_config_destroy(config);
|
|
|
|
//Find key
|
|
const char *key = "jjjjjjjjjj";
|
|
unsigned int id = cmph_search(hash, key, strlen(key));
|
|
fprintf(stderr, "Id:%u\n", id);
|
|
//Destroy hash
|
|
cmph_destroy(hash);
|
|
cmph_io_nlfile_adapter_destroy(source);
|
|
fclose(keys_fd);
|
|
return 0;
|
|
}
|
|
```
|
|
Download [file_adapter_ex2.c examples/file_adapter_ex2.c] and [keys.txt examples/keys.txt]
|
|
|
|
%!include: ALGORITHMS.t2t
|
|
|
|
%!include: FOOTER.t2t
|