Motiejus Jakštys
37e24524c2
git-subtree-dir: deps/cmph git-subtree-mainline:5040f4007bgit-subtree-split:a250982ade
211 lines
6.2 KiB
HTML
211 lines
6.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML>
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<HEAD>
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<META NAME="generator" CONTENT="http://txt2tags.org">
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<LINK REL="stylesheet" TYPE="text/css" HREF="DOC.css">
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<TITLE>CMPH - Examples</TITLE>
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</HEAD><BODY BGCOLOR="white" TEXT="black">
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<CENTER>
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<H1>CMPH - Examples</H1>
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</CENTER>
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<P>
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Using cmph is quite simple. Take a look in the following examples.
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</P>
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<HR NOSHADE SIZE=1>
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<PRE>
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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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</PRE>
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<P>
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Download <A HREF="examples/vector_adapter_ex1.c">vector_adapter_ex1.c</A>. This example does not work in versions below 0.6.
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</P>
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<HR NOSHADE SIZE=1>
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<PRE>
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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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</PRE>
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<P>
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Download <A HREF="examples/struct_vector_adapter_ex3.c">struct_vector_adapter_ex3.c</A>. This example does not work in versions below 0.8.
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</P>
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<HR NOSHADE SIZE=1>
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<PRE>
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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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</PRE>
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<P>
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Download <A HREF="examples/file_adapter_ex2.c">file_adapter_ex2.c</A> and <A HREF="examples/keys.txt">keys.txt</A>. This example does not work in versions below 0.8.
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</P>
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<HR NOSHADE SIZE=1>
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<TABLE ALIGN="center" CELLPADDING="4">
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<TR>
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<TD><A HREF="index.html">Home</A></TD>
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<TD><A HREF="chd.html">CHD</A></TD>
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<TD><A HREF="bdz.html">BDZ</A></TD>
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<TD><A HREF="bmz.html">BMZ</A></TD>
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<TD><A HREF="chm.html">CHM</A></TD>
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<TD><A HREF="brz.html">BRZ</A></TD>
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<TD><A HREF="fch.html">FCH</A></TD>
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</TR>
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</TABLE>
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<HR NOSHADE SIZE=1>
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<P>
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Enjoy!
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</P>
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<P>
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<A HREF="mailto:davi@users.sourceforge.net">Davi de Castro Reis</A>
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</P>
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<P>
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<A HREF="mailto:db8192@users.sourceforge.net">Djamel Belazzougui</A>
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</P>
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<P>
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<A HREF="mailto:fc_botelho@users.sourceforge.net">Fabiano Cupertino Botelho</A>
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</P>
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<P>
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<A HREF="mailto:nivio@dcc.ufmg.br">Nivio Ziviani</A>
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</P>
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