152 lines
4.5 KiB
Plaintext
152 lines
4.5 KiB
Plaintext
CMPH - Examples
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%!includeconf: CONFIG.t2t
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Using cmph is quite simple. Take a look in the following examples.
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-------------------------------------------------------------------
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```
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#include <cmph.h>
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#include <string.h>
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// Create minimal perfect hash function from in-memory vector
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int main(int argc, char **argv)
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{
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// Creating a filled vector
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unsigned int i = 0;
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const char *vector[] = {"aaaaaaaaaa", "bbbbbbbbbb", "cccccccccc", "dddddddddd", "eeeeeeeeee",
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"ffffffffff", "gggggggggg", "hhhhhhhhhh", "iiiiiiiiii", "jjjjjjjjjj"};
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unsigned int nkeys = 10;
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FILE* mphf_fd = fopen("temp.mph", "w");
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// Source of keys
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cmph_io_adapter_t *source = cmph_io_vector_adapter((char **)vector, nkeys);
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//Create minimal perfect hash function using the brz algorithm.
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cmph_config_t *config = cmph_config_new(source);
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cmph_config_set_algo(config, CMPH_BRZ);
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cmph_config_set_mphf_fd(config, mphf_fd);
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cmph_t *hash = cmph_new(config);
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cmph_config_destroy(config);
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cmph_dump(hash, mphf_fd);
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cmph_destroy(hash);
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fclose(mphf_fd);
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//Find key
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mphf_fd = fopen("temp.mph", "r");
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hash = cmph_load(mphf_fd);
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while (i < nkeys) {
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const char *key = vector[i];
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unsigned int id = cmph_search(hash, key, (cmph_uint32)strlen(key));
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fprintf(stderr, "key:%s -- hash:%u\n", key, id);
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i++;
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}
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//Destroy hash
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cmph_destroy(hash);
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cmph_io_vector_adapter_destroy(source);
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fclose(mphf_fd);
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return 0;
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}
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```
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Download [vector_adapter_ex1.c examples/vector_adapter_ex1.c]. This example does not work in versions below 0.6.
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-------------------------------
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```
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#include <cmph.h>
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#include <string.h>
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// Create minimal perfect hash function from in-memory vector
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#pragma pack(1)
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typedef struct {
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cmph_uint32 id;
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char key[11];
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cmph_uint32 year;
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} rec_t;
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#pragma pack(0)
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int main(int argc, char **argv)
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{
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// Creating a filled vector
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unsigned int i = 0;
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rec_t vector[10] = {{1, "aaaaaaaaaa", 1999}, {2, "bbbbbbbbbb", 2000}, {3, "cccccccccc", 2001},
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{4, "dddddddddd", 2002}, {5, "eeeeeeeeee", 2003}, {6, "ffffffffff", 2004},
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{7, "gggggggggg", 2005}, {8, "hhhhhhhhhh", 2006}, {9, "iiiiiiiiii", 2007},
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{10,"jjjjjjjjjj", 2008}};
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unsigned int nkeys = 10;
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FILE* mphf_fd = fopen("temp_struct_vector.mph", "w");
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// Source of keys
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cmph_io_adapter_t *source = cmph_io_struct_vector_adapter(vector, (cmph_uint32)sizeof(rec_t), (cmph_uint32)sizeof(cmph_uint32), 11, nkeys);
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//Create minimal perfect hash function using the BDZ algorithm.
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cmph_config_t *config = cmph_config_new(source);
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cmph_config_set_algo(config, CMPH_BDZ);
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cmph_config_set_mphf_fd(config, mphf_fd);
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cmph_t *hash = cmph_new(config);
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cmph_config_destroy(config);
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cmph_dump(hash, mphf_fd);
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cmph_destroy(hash);
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fclose(mphf_fd);
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//Find key
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mphf_fd = fopen("temp_struct_vector.mph", "r");
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hash = cmph_load(mphf_fd);
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while (i < nkeys) {
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const char *key = vector[i].key;
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unsigned int id = cmph_search(hash, key, 11);
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fprintf(stderr, "key:%s -- hash:%u\n", key, id);
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i++;
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}
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//Destroy hash
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cmph_destroy(hash);
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cmph_io_vector_adapter_destroy(source);
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fclose(mphf_fd);
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return 0;
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}
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```
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Download [struct_vector_adapter_ex3.c examples/struct_vector_adapter_ex3.c]. This example does not work in versions below 0.8.
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-------------------------------
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```
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#include <cmph.h>
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#include <stdio.h>
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#include <string.h>
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// Create minimal perfect hash function from in-disk keys using BDZ algorithm
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int main(int argc, char **argv)
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{
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//Open file with newline separated list of keys
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FILE * keys_fd = fopen("keys.txt", "r");
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cmph_t *hash = NULL;
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if (keys_fd == NULL)
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{
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fprintf(stderr, "File \"keys.txt\" not found\n");
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exit(1);
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}
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// Source of keys
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cmph_io_adapter_t *source = cmph_io_nlfile_adapter(keys_fd);
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cmph_config_t *config = cmph_config_new(source);
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cmph_config_set_algo(config, CMPH_BDZ);
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hash = cmph_new(config);
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cmph_config_destroy(config);
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//Find key
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const char *key = "jjjjjjjjjj";
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unsigned int id = cmph_search(hash, key, (cmph_uint32)strlen(key));
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fprintf(stderr, "Id:%u\n", id);
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//Destroy hash
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cmph_destroy(hash);
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cmph_io_nlfile_adapter_destroy(source);
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fclose(keys_fd);
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return 0;
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}
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```
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Download [file_adapter_ex2.c examples/file_adapter_ex2.c] and [keys.txt examples/keys.txt]. This example does not work in versions below 0.8.
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%!include: ALGORITHMS.t2t
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%!include: FOOTER.t2t
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%!include(html): ''GOOGLEANALYTICS.t2t'' |