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fc_botelho 2005-01-27 11:14:13 +00:00
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README.t2t
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@ -8,11 +8,11 @@ CMPH - C Minimal Perfect Hashing Library
**Description** **Description**
C Minimal Perfect Hashing Library is a portable LGPLed library to create and C Minimal Perfect Hashing Library is a portable LGPLed library to create and
to work with minimal perfect hashing functions. The cmph library encapsulates the newest to work with minimal perfect hash functions. The cmph library encapsulates the newest
and more efficient algorithms (available in the literature) in an easy-to-use, and more efficient algorithms (available in the literature) in an easy-to-use,
production-quality and fast API. The library is designed to work with big entries that production-quality and fast API. The library is designed to work with big entries that
can not fit in the main memory. It has been used successfully for constructing minimal perfect can not fit in the main memory. It has been used successfully for constructing minimal perfect
hashing functions for sets with more than 100 million of keys. hash functions for sets with more than 100 million of keys.
Although there is a lack of similar libraries Although there is a lack of similar libraries
in the free software world ([gperf is a bit different gperf.html]), we can point out some in the free software world ([gperf is a bit different gperf.html]), we can point out some
of the distinguishable features of cmph: of the distinguishable features of cmph:
@ -28,6 +28,7 @@ of the distinguishable features of cmph:
- Well encapsulated API aiming binary compatibility through releases. - Well encapsulated API aiming binary compatibility through releases.
- Free Software. - Free Software.
---------------------------------------- ----------------------------------------
**Supported Algorithms** **Supported Algorithms**
@ -73,7 +74,7 @@ Using cmph is quite simple. Take a look.
//Fill vector //Fill vector
//... //...
//Create minimal perfect hashing function using the default(chm) algorithm. //Create minimal perfect hash function using the default(chm) algorithm.
cmph_config_t *config = cmph_config_new(cmph_io_vector_adapter(vector, nkeys)); cmph_config_t *config = cmph_config_new(cmph_io_vector_adapter(vector, nkeys));
cmph_t *hash = cmph_new(config); cmph_t *hash = cmph_new(config);
cmph_config_destroy(config); cmph_config_destroy(config);
@ -116,10 +117,10 @@ Using cmph is quite simple. Take a look.
cmph is the name of both the library and the utility cmph is the name of both the library and the utility
application that comes with this package. You can use the cmph application that comes with this package. You can use the cmph
application for constructing minimal perfect hashing functions from the command line. application for constructing minimal perfect hash functions from the command line.
The cmph utility The cmph utility
comes with a number of flags, but it is very simple to create and to query comes with a number of flags, but it is very simple to create and to query
minimal perfect hashing functions: minimal perfect hash functions:
``` ```
$ # Using the chm algorithm (default one) for constructing a mphf for keys in file keys_file $ # Using the chm algorithm (default one) for constructing a mphf for keys in file keys_file