stable version of BRZ algorithm using buffers

INSTALL

@@ -1,27 +1,43 @@
+Installation Instructions
+*************************
+
+Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005 Free
+Software Foundation, Inc.
+
+This file is free documentation; the Free Software Foundation gives
+unlimited permission to copy, distribute and modify it.
+
 Basic Installation
 ==================
 
-   These are generic installation instructions.
+These are generic installation instructions.
 
    The `configure' shell script attempts to guess correct values for
 various system-dependent variables used during compilation.  It uses
 those values to create a `Makefile' in each directory of the package.
 It may also create one or more `.h' files containing system-dependent
 definitions.  Finally, it creates a shell script `config.status' that
-you can run in the future to recreate the current configuration, a file
+you can run in the future to recreate the current configuration, and a
-`config.cache' that saves the results of its tests to speed up
+file `config.log' containing compiler output (useful mainly for
-reconfiguring, and a file `config.log' containing compiler output
+debugging `configure').
-(useful mainly for debugging `configure').
+
+   It can also use an optional file (typically called `config.cache'
+and enabled with `--cache-file=config.cache' or simply `-C') that saves
+the results of its tests to speed up reconfiguring.  (Caching is
+disabled by default to prevent problems with accidental use of stale
+cache files.)
 
    If you need to do unusual things to compile the package, please try
 to figure out how `configure' could check whether to do them, and mail
 diffs or instructions to the address given in the `README' so they can
-be considered for the next release.  If at some point `config.cache'
+be considered for the next release.  If you are using the cache, and at
-contains results you don't want to keep, you may remove or edit it.
+some point `config.cache' contains results you don't want to keep, you
+may remove or edit it.
 
-   The file `configure.in' is used to create `configure' by a program
+   The file `configure.ac' (or `configure.in') is used to create
-called `autoconf'.  You only need `configure.in' if you want to change
+`configure' by a program called `autoconf'.  You only need
-it or regenerate `configure' using a newer version of `autoconf'.
+`configure.ac' if you want to change it or regenerate `configure' using
+a newer version of `autoconf'.
 
 The simplest way to compile this package is:
 
@@ -54,20 +70,22 @@ The simplest way to compile this package is:
 Compilers and Options
 =====================
 
-   Some systems require unusual options for compilation or linking that
+Some systems require unusual options for compilation or linking that the
-the `configure' script does not know about.  You can give `configure'
+`configure' script does not know about.  Run `./configure --help' for
-initial values for variables by setting them in the environment.  Using
+details on some of the pertinent environment variables.
-a Bourne-compatible shell, you can do that on the command line like
-this:
-     CC=c89 CFLAGS=-O2 LIBS=-lposix ./configure
 
-Or on systems that have the `env' program, you can do it like this:
+   You can give `configure' initial values for configuration parameters
-     env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure
+by setting variables in the command line or in the environment.  Here
+is an example:
+
+     ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix
+
+   *Note Defining Variables::, for more details.
 
 Compiling For Multiple Architectures
 ====================================
 
-   You can compile the package for more than one kind of computer at the
+You can compile the package for more than one kind of computer at the
 same time, by placing the object files for each architecture in their
 own directory.  To do this, you must use a version of `make' that
 supports the `VPATH' variable, such as GNU `make'.  `cd' to the
@@ -75,28 +93,28 @@ directory where you want the object files and executables to go and run
 the `configure' script.  `configure' automatically checks for the
 source code in the directory that `configure' is in and in `..'.
 
-   If you have to use a `make' that does not supports the `VPATH'
+   If you have to use a `make' that does not support the `VPATH'
-variable, you have to compile the package for one architecture at a time
+variable, you have to compile the package for one architecture at a
-in the source code directory.  After you have installed the package for
+time in the source code directory.  After you have installed the
-one architecture, use `make distclean' before reconfiguring for another
+package for one architecture, use `make distclean' before reconfiguring
-architecture.
+for another architecture.
 
 Installation Names
 ==================
 
-   By default, `make install' will install the package's files in
+By default, `make install' will install the package's files in
 `/usr/local/bin', `/usr/local/man', etc.  You can specify an
 installation prefix other than `/usr/local' by giving `configure' the
-option `--prefix=PATH'.
+option `--prefix=PREFIX'.
 
    You can specify separate installation prefixes for
 architecture-specific files and architecture-independent files.  If you
-give `configure' the option `--exec-prefix=PATH', the package will use
+give `configure' the option `--exec-prefix=PREFIX', the package will
-PATH as the prefix for installing programs and libraries.
+use PREFIX as the prefix for installing programs and libraries.
 Documentation and other data files will still use the regular prefix.
 
    In addition, if you use an unusual directory layout you can give
-options like `--bindir=PATH' to specify different values for particular
+options like `--bindir=DIR' to specify different values for particular
 kinds of files.  Run `configure --help' for a list of the directories
 you can set and what kinds of files go in them.
 
@@ -107,7 +125,7 @@ option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
 Optional Features
 =================
 
-   Some packages pay attention to `--enable-FEATURE' options to
+Some packages pay attention to `--enable-FEATURE' options to
 `configure', where FEATURE indicates an optional part of the package.
 They may also pay attention to `--with-PACKAGE' options, where PACKAGE
 is something like `gnu-as' or `x' (for the X Window System).  The
@@ -122,48 +140,86 @@ you can use the `configure' options `--x-includes=DIR' and
 Specifying the System Type
 ==========================
 
-   There may be some features `configure' can not figure out
+There may be some features `configure' cannot figure out automatically,
-automatically, but needs to determine by the type of host the package
+but needs to determine by the type of machine the package will run on.
-will run on.  Usually `configure' can figure that out, but if it prints
+Usually, assuming the package is built to be run on the _same_
-a message saying it can not guess the host type, give it the
+architectures, `configure' can figure that out, but if it prints a
-`--host=TYPE' option.  TYPE can either be a short name for the system
+message saying it cannot guess the machine type, give it the
-type, such as `sun4', or a canonical name with three fields:
+`--build=TYPE' option.  TYPE can either be a short name for the system
+type, such as `sun4', or a canonical name which has the form:
+
      CPU-COMPANY-SYSTEM
 
-See the file `config.sub' for the possible values of each field.  If
+where SYSTEM can have one of these forms:
-`config.sub' isn't included in this package, then this package doesn't
-need to know the host type.
 
-   If you are building compiler tools for cross-compiling, you can also
+     OS KERNEL-OS
+
+   See the file `config.sub' for the possible values of each field.  If
+`config.sub' isn't included in this package, then this package doesn't
+need to know the machine type.
+
+   If you are _building_ compiler tools for cross-compiling, you should
 use the `--target=TYPE' option to select the type of system they will
-produce code for and the `--build=TYPE' option to select the type of
+produce code for.
-system on which you are compiling the package.
+
+   If you want to _use_ a cross compiler, that generates code for a
+platform different from the build platform, you should specify the
+"host" platform (i.e., that on which the generated programs will
+eventually be run) with `--host=TYPE'.
 
 Sharing Defaults
 ================
 
-   If you want to set default values for `configure' scripts to share,
+If you want to set default values for `configure' scripts to share, you
-you can create a site shell script called `config.site' that gives
+can create a site shell script called `config.site' that gives default
-default values for variables like `CC', `cache_file', and `prefix'.
+values for variables like `CC', `cache_file', and `prefix'.
 `configure' looks for `PREFIX/share/config.site' if it exists, then
 `PREFIX/etc/config.site' if it exists.  Or, you can set the
 `CONFIG_SITE' environment variable to the location of the site script.
 A warning: not all `configure' scripts look for a site script.
 
-Operation Controls
+Defining Variables
 ==================
 
-   `configure' recognizes the following options to control how it
+Variables not defined in a site shell script can be set in the
-operates.
+environment passed to `configure'.  However, some packages may run
+configure again during the build, and the customized values of these
+variables may be lost.  In order to avoid this problem, you should set
+them in the `configure' command line, using `VAR=value'.  For example:
 
-`--cache-file=FILE'
+     ./configure CC=/usr/local2/bin/gcc
-     Use and save the results of the tests in FILE instead of
+
-     `./config.cache'.  Set FILE to `/dev/null' to disable caching, for
+causes the specified `gcc' to be used as the C compiler (unless it is
-     debugging `configure'.
+overridden in the site shell script).  Here is a another example:
+
+     /bin/bash ./configure CONFIG_SHELL=/bin/bash
+
+Here the `CONFIG_SHELL=/bin/bash' operand causes subsequent
+configuration-related scripts to be executed by `/bin/bash'.
+
+`configure' Invocation
+======================
+
+`configure' recognizes the following options to control how it operates.
 
 `--help'
+`-h'
      Print a summary of the options to `configure', and exit.
 
+`--version'
+`-V'
+     Print the version of Autoconf used to generate the `configure'
+     script, and exit.
+
+`--cache-file=FILE'
+     Enable the cache: use and save the results of the tests in FILE,
+     traditionally `config.cache'.  FILE defaults to `/dev/null' to
+     disable caching.
+
+`--config-cache'
+`-C'
+     Alias for `--cache-file=config.cache'.
+
 `--quiet'
 `--silent'
 `-q'
@@ -175,8 +231,6 @@ operates.
      Look for the package's source code in directory DIR.  Usually
      `configure' can determine that directory automatically.
 
-`--version'
+`configure' also accepts some other, not widely useful, options.  Run
-     Print the version of Autoconf used to generate the `configure'
+`configure --help' for more details.
-     script, and exit.
 
-`configure' also accepts some other, not widely useful, options.

src/Makefile.am

@@ -1,7 +1,7 @@
 bin_PROGRAMS = cmph
 lib_LTLIBRARIES = libcmph.la
 include_HEADERS = cmph.h cmph_types.h
-libcmph_la_SOURCES = debug.h\
+libcmph_la_SOURCES = util.h debug.h\
 				  bitbool.h bitbool.c\
 				  cmph_types.h\
 				  hash.h hash_state.h hash.c\
@@ -17,9 +17,11 @@ libcmph_la_SOURCES = debug.h\
 				  chm.h chm_structs.h chm.c\
 				  bmz.h bmz_structs.h bmz.c\
 				  bmz8.h bmz8_structs.h bmz8.c\
+				  buffer_manage.h buffer_manage.c\
+				  buffer_entry.h buffer_entry.c\
 				  brz.h brz_structs.h brz.c
 
 libcmph_la_LDFLAGS = -version-info 0:0:0
 
-cmph_SOURCES = 	main.c ../wingetopt.h ../wingetopt.c
+cmph_SOURCES = 	main.c wingetopt.h wingetopt.c
 cmph_LDADD = libcmph.la

src/bmz.c

@@ -64,7 +64,7 @@ cmph_t *bmz_new(cmph_config_t *mph, float c)
 	cmph_uint8 *used_edges = NULL;
 	cmph_uint8 restart_mapping = 0;
 	cmph_uint8 * visited = NULL;
-	
+
 	bmz_config_data_t *bmz = (bmz_config_data_t *)mph->data;
 	DEBUGP("c: %f\n", c);
 	bmz->m = mph->key_source->nkeys;	
@@ -93,7 +93,7 @@ cmph_t *bmz_new(cmph_config_t *mph, float c)
 		bmz->hashes[0] = hash_state_new(bmz->hashfuncs[0], bmz->n);
 		DEBUGP("hash function 2\n");
 		bmz->hashes[1] = hash_state_new(bmz->hashfuncs[1], bmz->n);
-		DEBUGP("Generating edges\n");		
+		DEBUGP("Generating edges\n");
 		ok = bmz_gen_edges(mph);
 		if (!ok)
 		{
@@ -109,20 +109,18 @@ cmph_t *bmz_new(cmph_config_t *mph, float c)
 			}
 			if (iterations == 0) break;
 		} 
-		else break;	
+		else break;
 	  }
 	  if (iterations == 0)
 	  {
 		graph_destroy(bmz->graph);	
 		return NULL;
 	  }
-
 	  // Ordering step
 	  if (mph->verbosity)
 	  {
 		fprintf(stderr, "Starting ordering step\n");
 	  }
-
 	  graph_obtain_critical_nodes(bmz->graph);
 
 	  // Searching step
@@ -164,7 +162,7 @@ cmph_t *bmz_new(cmph_config_t *mph, float c)
 	  free(used_edges);
 	  free(visited);
         }while(restart_mapping && iterations_map > 0);
-	graph_destroy(bmz->graph);	
+	graph_destroy(bmz->graph);
 	bmz->graph = NULL;
 	if (iterations_map == 0) 
 	{
@@ -181,6 +179,7 @@ cmph_t *bmz_new(cmph_config_t *mph, float c)
 	bmzf->m = bmz->m;
 	mphf->data = bmzf;
 	mphf->size = bmz->m;
+
 	DEBUGP("Successfully generated minimal perfect hash\n");
 	if (mph->verbosity)
 	{

src/bmz8.c

@@ -5,7 +5,6 @@
 #include "hash.h"
 #include "vqueue.h"
 #include "bitbool.h"
-
 #include <math.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -66,7 +65,6 @@ cmph_t *bmz8_new(cmph_config_t *mph, float c)
 	cmph_uint8 * visited = NULL;
 	bmz8_config_data_t *bmz8 = (bmz8_config_data_t *)mph->data;
 	
-	
 	if (mph->key_source->nkeys >= 256)
 	{
 		if (mph->verbosity) fprintf(stderr, "The number of keys in BMZ8 must be lower than 256.\n");
@@ -168,9 +166,11 @@ cmph_t *bmz8_new(cmph_config_t *mph, float c)
  	        iterations_map--;
 		if (mph->verbosity) fprintf(stderr, "Restarting mapping step. %u iterations remaining.\n", iterations_map);
 	  }    
+
 	  free(used_edges);
 	  free(visited);
-        }while(restart_mapping && iterations_map > 0);
+
+	}while(restart_mapping && iterations_map > 0);
 	graph_destroy(bmz8->graph);	
 	bmz8->graph = NULL;
 	if (iterations_map == 0) 
@@ -266,8 +266,8 @@ static cmph_uint8 bmz8_traverse_critical_nodes(bmz8_config_data_t *bmz8, cmph_ui
 static cmph_uint8 bmz8_traverse_critical_nodes_heuristic(bmz8_config_data_t *bmz8, cmph_uint8 v, cmph_uint8 * biggest_g_value, cmph_uint8 * biggest_edge_value, cmph_uint8 * used_edges, cmph_uint8 * visited)
 {
         cmph_uint8 next_g;
-	cmph_uint32 u;   /* Auxiliary vertex */
+	cmph_uint32 u;   
-	cmph_uint32 lav; /* lookahead vertex */
+	cmph_uint32 lav; 
 	cmph_uint8 collision;
 	cmph_uint8 * unused_g_values = NULL;
 	cmph_uint8 unused_g_values_capacity = 0;
@@ -278,7 +278,7 @@ static cmph_uint8 bmz8_traverse_critical_nodes_heuristic(bmz8_config_data_t *bmz
 	DEBUGP("Labelling critical vertices\n");
 	bmz8->g[v] = (cmph_uint8)ceil ((double)(*biggest_edge_value)/2) - 1;
 	SETBIT(visited, v);
-	next_g    = (cmph_uint8)floor((double)(*biggest_edge_value/2)); /* next_g is incremented in the do..while statement*/
+	next_g    = (cmph_uint8)floor((double)(*biggest_edge_value/2)); 
 	vqueue_insert(q, v);
 	while(!vqueue_is_empty(q))
 	{
@@ -324,14 +324,15 @@ static cmph_uint8 bmz8_traverse_critical_nodes_heuristic(bmz8_config_data_t *bmz
 					{
 					        if(nunused_g_values == unused_g_values_capacity)
 						{
-   						        unused_g_values = realloc(unused_g_values, (unused_g_values_capacity + BUFSIZ)*sizeof(cmph_uint8));
+							unused_g_values = realloc(unused_g_values, (unused_g_values_capacity + BUFSIZ)*sizeof(cmph_uint8));
 						        unused_g_values_capacity += BUFSIZ;  							
 						} 
 						unused_g_values[nunused_g_values++] = next_g;							
 
 					}
  					if (next_g > *biggest_g_value) *biggest_g_value = next_g;
-				}	
+				}
+				
 				next_g_index--;
 				if (next_g_index < nunused_g_values) unused_g_values[next_g_index] = unused_g_values[--nunused_g_values];
 
@@ -345,9 +346,11 @@ static cmph_uint8 bmz8_traverse_critical_nodes_heuristic(bmz8_config_data_t *bmz
 						if(next_g + bmz8->g[lav] > *biggest_edge_value) *biggest_edge_value = next_g + bmz8->g[lav];
 					}
 				}
+				
 				bmz8->g[u] = next_g; // Labelling vertex u.
 				SETBIT(visited, u);
-			        vqueue_insert(q, u);
+			      	vqueue_insert(q, u);
+				
 			}			
 	        }
 		 
@@ -537,7 +540,7 @@ cmph_uint8 bmz8_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
 void bmz8_destroy(cmph_t *mphf)
 {
 	bmz8_data_t *data = (bmz8_data_t *)mphf->data;
-	free(data->g);	
+	free(data->g);
 	hash_state_destroy(data->hashes[0]);
 	hash_state_destroy(data->hashes[1]);
 	free(data->hashes);

src/brz.c

@@ -4,10 +4,10 @@
 #include "brz.h"
 #include "cmph_structs.h"
 #include "brz_structs.h"
+#include "buffer_manage.h"
 #include "cmph.h"
 #include "hash.h"
 #include "bitbool.h"
-
 #include <math.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -21,12 +21,14 @@ static int brz_gen_graphs(cmph_config_t *mph);
 static cmph_uint32 brz_min_index(cmph_uint32 * vector, cmph_uint32 n);
 static char * brz_read_key(FILE * fd);
 static void brz_destroy_keys_vd(char ** keys_vd, cmph_uint8 nkeys);
-static void brz_copy_partial_mphf(brz_config_data_t *brz, bmz8_data_t * bmzf, cmph_uint32 index, cmph_io_adapter_t *source);
+static char * brz_copy_partial_mphf(brz_config_data_t *brz, bmz8_data_t * bmzf, cmph_uint32 index,  cmph_uint32 *buflen);
+//static void brz_copy_partial_mphf(brz_config_data_t *brz, bmz8_data_t * bmzf, cmph_uint32 index);
 static void brz_flush_g(brz_config_data_t *brz, cmph_uint32 *start_index, FILE * fd);
 brz_config_data_t *brz_config_new()
 {
 	brz_config_data_t *brz = NULL; 	
 	brz = (brz_config_data_t *)malloc(sizeof(brz_config_data_t));
+	brz->b = 128;
 	brz->hashfuncs[0] = CMPH_HASH_JENKINS;
 	brz->hashfuncs[1] = CMPH_HASH_JENKINS;
 	brz->hashfuncs[2] = CMPH_HASH_JENKINS;
@@ -35,10 +37,11 @@ brz_config_data_t *brz_config_new()
 	brz->g      = NULL;
 	brz->h1 = NULL;
 	brz->h2 = NULL;
-	brz->h3 = NULL;
+	brz->h0 = NULL;
 	brz->memory_availability = 1024*1024;
 	brz->tmp_dir = (cmph_uint8 *)calloc(10, sizeof(cmph_uint8));
-	strcpy(brz->tmp_dir, "/var/tmp/\0"); 
+	brz->mphf_fd = NULL;
+	strcpy((char *)(brz->tmp_dir), "/var/tmp/"); 
 	assert(brz);
 	return brz;
 }
@@ -46,6 +49,7 @@ brz_config_data_t *brz_config_new()
 void brz_config_destroy(cmph_config_t *mph)
 {
 	brz_config_data_t *data = (brz_config_data_t *)mph->data;
+	free(data->tmp_dir);
 	DEBUGP("Destroying algorithm dependent data\n");
 	free(data);
 }
@@ -74,22 +78,35 @@ void brz_config_set_tmp_dir(cmph_config_t *mph, cmph_uint8 *tmp_dir)
 	brz_config_data_t *brz = (brz_config_data_t *)mph->data;
 	if(tmp_dir)
 	{
-		cmph_uint32 len = strlen(tmp_dir);
+		cmph_uint32 len = strlen((char *)tmp_dir);
 		free(brz->tmp_dir);
 		if(tmp_dir[len-1] != '/')
 		{
 			brz->tmp_dir = calloc(len+2, sizeof(cmph_uint8));
-			sprintf(brz->tmp_dir, "%s/", tmp_dir); 
+			sprintf((char *)(brz->tmp_dir), "%s/", (char *)tmp_dir); 
 		}
 		else
 		{
 			brz->tmp_dir = calloc(len+1, sizeof(cmph_uint8));
-			sprintf(brz->tmp_dir, "%s", tmp_dir); 
+			sprintf((char *)(brz->tmp_dir), "%s", (char *)tmp_dir); 
 		}
 		
 	}
 }
 
+void brz_config_set_mphf_fd(cmph_config_t *mph, FILE *mphf_fd)
+{
+	brz_config_data_t *brz = (brz_config_data_t *)mph->data;
+	brz->mphf_fd = mphf_fd;
+	assert(brz->mphf_fd);
+}
+
+void brz_config_set_b(cmph_config_t *mph, cmph_uint8 b)
+{
+	brz_config_data_t *brz = (brz_config_data_t *)mph->data;
+	brz->b = b;
+}
+
 cmph_t *brz_new(cmph_config_t *mph, float c)
 {
 	cmph_t *mphf = NULL;
@@ -102,7 +119,7 @@ cmph_t *brz_new(cmph_config_t *mph, float c)
 	brz->c = c;
 	brz->m = mph->key_source->nkeys;
 	DEBUGP("m: %u\n", brz->m);
-	brz->k = ceil(brz->m/170);
+	brz->k = ceil(brz->m/(brz->b));
 	DEBUGP("k: %u\n", brz->k);
 	brz->size   = (cmph_uint8 *) calloc(brz->k, sizeof(cmph_uint8));
 	
@@ -112,22 +129,22 @@ cmph_t *brz_new(cmph_config_t *mph, float c)
 		fprintf(stderr, "Partioning the set of keys.\n");	
 	}
 	
-	brz->h1 = (hash_state_t **)malloc(sizeof(hash_state_t *)*brz->k);
+//	brz->h1 = (hash_state_t **)calloc(brz->k, sizeof(hash_state_t *));
-	brz->h2 = (hash_state_t **)malloc(sizeof(hash_state_t *)*brz->k);
+//	brz->h2 = (hash_state_t **)calloc(brz->k, sizeof(hash_state_t *));
-	brz->g  = (cmph_uint8 **)  malloc(sizeof(cmph_uint8 *)  *brz->k);
+//	brz->g  = (cmph_uint8 **)  calloc(brz->k, sizeof(cmph_uint8 *));
 	
 	while(1)
 	{
 		int ok;
 		DEBUGP("hash function 3\n");
-		brz->h3 = hash_state_new(brz->hashfuncs[2], brz->k);
+		brz->h0 = hash_state_new(brz->hashfuncs[2], brz->k);
 		DEBUGP("Generating graphs\n");
 		ok = brz_gen_graphs(mph);
 		if (!ok)
 		{
 			--iterations;
-			hash_state_destroy(brz->h3);
+			hash_state_destroy(brz->h0);
-			brz->h3 = NULL;
+			brz->h0 = NULL;
 			DEBUGP("%u iterations remaining to create the graphs in a external file\n", iterations);
 			if (mph->verbosity)
 			{
@@ -150,7 +167,6 @@ cmph_t *brz_new(cmph_config_t *mph, float c)
 	{
 		brz->offset[i] = brz->size[i-1] + brz->offset[i-1];
 	}
-
 	// Generating a mphf
 	mphf = (cmph_t *)malloc(sizeof(cmph_t));
 	mphf->algo = mph->algo;
@@ -161,14 +177,12 @@ cmph_t *brz_new(cmph_config_t *mph, float c)
 	brz->h1 = NULL; //transfer memory ownership
 	brzf->h2 = brz->h2;
 	brz->h2 = NULL; //transfer memory ownership
-	brzf->h3 = brz->h3;
+	brzf->h0 = brz->h0;
-	brz->h3 = NULL; //transfer memory ownership
+	brz->h0 = NULL; //transfer memory ownership
 	brzf->size = brz->size;
 	brz->size = NULL; //transfer memory ownership
 	brzf->offset = brz->offset;
 	brz->offset = NULL; //transfer memory ownership
-	brzf->tmp_dir = brz->tmp_dir;
-	brz->tmp_dir = NULL; //transfer memory ownership
 	brzf->k = brz->k;
 	brzf->c = brz->c;
 	brzf->m = brz->m;
@@ -186,47 +200,42 @@ static int brz_gen_graphs(cmph_config_t *mph)
 {
 	cmph_uint32 i, e;
 	brz_config_data_t *brz = (brz_config_data_t *)mph->data;
-	//cmph_uint32 memory_availability = 200*1024*1024;
 	cmph_uint32 memory_usage = 0;
 	cmph_uint32 nkeys_in_buffer = 0;
 	cmph_uint8 *buffer = (cmph_uint8 *)malloc(brz->memory_availability);
-	cmph_uint32 *buckets_size = (cmph_uint32 *)calloc(brz->k, sizeof(cmph_uint32));	
+	cmph_uint32 *buckets_size = (cmph_uint32 *)calloc(brz->k, sizeof(cmph_uint32));
 	cmph_uint32 *keys_index = NULL;
 	cmph_uint8 **buffer_merge = NULL;
-	cmph_uint32 *buffer_h3 = NULL;
+	cmph_uint32 *buffer_h0 = NULL;
 	cmph_uint32 nflushes = 0;
-	cmph_uint32 h3;
+	cmph_uint32 h0;
 	FILE *  tmp_fd = NULL;
-	FILE ** tmp_fds = NULL;
+	buffer_manage_t * buff_manage = NULL;
 	char *filename = NULL;
 	char *key = NULL;
 	cmph_uint32 keylen;
-	cmph_uint32 max_size = 0;
 	cmph_uint32 cur_bucket = 0;
 	cmph_uint8 nkeys_vd = 0;
-	cmph_uint32 start_index = 0;
 	char ** keys_vd = NULL;
 	
-	
 	mph->key_source->rewind(mph->key_source->data);
 	DEBUGP("Generating graphs from %u keys\n", brz->m);
 	// Partitioning
 	for (e = 0; e < brz->m; ++e)
 	{
 		mph->key_source->read(mph->key_source->data, &key, &keylen);
-			
+
 		/* Buffers management */
 		if (memory_usage + keylen + 1 > brz->memory_availability) // flush buffers 
-		{ 
+		{
 			if(mph->verbosity)
 			{
 				fprintf(stderr, "Flushing  %u\n", nkeys_in_buffer);
 			}
 			cmph_uint32 value = buckets_size[0];
 			cmph_uint32 sum = 0;
-
+			cmph_uint32 keylen1 = 0;
-			cmph_uint32 keylen1 = 0;			
+			buckets_size[0]   = 0;
-			buckets_size[0]   = 0;			
 			for(i = 1; i < brz->k; i++)
 			{
 				if(buckets_size[i] == 0) continue;
@@ -239,20 +248,20 @@ static int brz_gen_graphs(cmph_config_t *mph)
 			keys_index = (cmph_uint32 *)calloc(nkeys_in_buffer, sizeof(cmph_uint32));
 			for(i = 0; i < nkeys_in_buffer; i++)
 			{
-				keylen1 = strlen(buffer + memory_usage);
+				keylen1 = strlen((char *)(buffer + memory_usage));
-				h3 = hash(brz->h3, buffer + memory_usage, keylen1) % brz->k;
+				h0 = hash(brz->h0, (char *)(buffer + memory_usage), keylen1) % brz->k;
-				keys_index[buckets_size[h3]] = memory_usage;
+				keys_index[buckets_size[h0]] = memory_usage;
-				buckets_size[h3]++;
+				buckets_size[h0]++;
 				memory_usage = memory_usage + keylen1 + 1;
 			}
-			filename = (char *)calloc(strlen(brz->tmp_dir) + 11, sizeof(char));
+			filename = (char *)calloc(strlen((char *)(brz->tmp_dir)) + 11, sizeof(char));
 			sprintf(filename, "%s%u.cmph",brz->tmp_dir, nflushes);
 			tmp_fd = fopen(filename, "wb");
 			free(filename);
 			filename = NULL;
 			for(i = 0; i < nkeys_in_buffer; i++)
 			{
-				keylen1 = strlen(buffer + keys_index[i]) + 1;
+				keylen1 = strlen((char *)(buffer + keys_index[i])) + 1;
 				fwrite(buffer + keys_index[i], 1, keylen1, tmp_fd);
 			}
 			nkeys_in_buffer = 0;
@@ -264,17 +273,16 @@ static int brz_gen_graphs(cmph_config_t *mph)
 		}
 		memcpy(buffer + memory_usage, key, keylen + 1);
 		memory_usage = memory_usage + keylen + 1;
-		h3 = hash(brz->h3, key, keylen) % brz->k;
+		h0 = hash(brz->h0, key, keylen) % brz->k;
-		if ((brz->size[h3] == MAX_BUCKET_SIZE) || ((brz->c >= 1.0) && (cmph_uint8)(brz->c * brz->size[h3]) < brz->size[h3])) 
+		if ((brz->size[h0] == MAX_BUCKET_SIZE) || ((brz->c >= 1.0) && (cmph_uint8)(brz->c * brz->size[h0]) < brz->size[h0])) 
 		{
 			free(buffer);
 			free(buckets_size);
 			return 0;
 		}
-		brz->size[h3] = brz->size[h3] + 1;
+		brz->size[h0] = brz->size[h0] + 1;
-		buckets_size[h3] ++;
+		buckets_size[h0] ++;
 		nkeys_in_buffer++;
-
 		mph->key_source->dispose(mph->key_source->data, key, keylen);
 	}
 
@@ -299,20 +307,20 @@ static int brz_gen_graphs(cmph_config_t *mph)
 		keys_index = (cmph_uint32 *)calloc(nkeys_in_buffer, sizeof(cmph_uint32));
 		for(i = 0; i < nkeys_in_buffer; i++)
 		{
-			keylen1 = strlen(buffer + memory_usage);
+			keylen1 = strlen((char *)(buffer + memory_usage));
-			h3 = hash(brz->h3, buffer + memory_usage, keylen1) % brz->k;
+			h0 = hash(brz->h0, (char *)(buffer + memory_usage), keylen1) % brz->k;
-			keys_index[buckets_size[h3]] = memory_usage;
+			keys_index[buckets_size[h0]] = memory_usage;
-			buckets_size[h3]++;
+			buckets_size[h0]++;
 			memory_usage = memory_usage + keylen1 + 1;
 		}
-		filename = (char *)calloc(strlen(brz->tmp_dir) + 11, sizeof(char));
+		filename = (char *)calloc(strlen((char *)(brz->tmp_dir)) + 11, sizeof(char));
 		sprintf(filename, "%s%u.cmph",brz->tmp_dir, nflushes);
 		tmp_fd = fopen(filename, "wb");
 		free(filename);
 		filename = NULL;
 		for(i = 0; i < nkeys_in_buffer; i++)
 		{
-			keylen1 = strlen(buffer + keys_index[i]) + 1;
+			keylen1 = strlen((char *)(buffer + keys_index[i])) + 1;
 			fwrite(buffer + keys_index[i], 1, keylen1, tmp_fd);
 		}
 		nkeys_in_buffer = 0;
@@ -322,66 +330,70 @@ static int brz_gen_graphs(cmph_config_t *mph)
 		free(keys_index);
 		fclose(tmp_fd);
 	}
+
 	free(buffer);
 	free(buckets_size);
 	if(nflushes > 1024) return 0; // Too many files generated.
-	
 	// mphf generation
 	if(mph->verbosity)
 	{
 		fprintf(stderr, "\nMPHF generation \n");
 	}
-	tmp_fds = (FILE **)calloc(nflushes, sizeof(FILE *));
+	/* Starting to dump to disk the resultant MPHF: __cmph_dump function */
+	fwrite(cmph_names[CMPH_BRZ], (cmph_uint32)(strlen(cmph_names[CMPH_BRZ]) + 1), 1, brz->mphf_fd);
+	fwrite(&(brz->m), sizeof(brz->m), 1, brz->mphf_fd);
+	fwrite(&(brz->c), sizeof(cmph_float32), 1, brz->mphf_fd);
+	fwrite(&(brz->k), sizeof(cmph_uint32), 1, brz->mphf_fd); // number of MPHFs
+	fwrite(brz->size, sizeof(cmph_uint8)*(brz->k), 1, brz->mphf_fd);
+	
+	//tmp_fds = (FILE **)calloc(nflushes, sizeof(FILE *));
+	buff_manage = buffer_manage_new(brz->memory_availability, nflushes);
 	buffer_merge = (cmph_uint8 **)calloc(nflushes, sizeof(cmph_uint8 *));
-	buffer_h3    = (cmph_uint32 *)calloc(nflushes, sizeof(cmph_uint32));
+	buffer_h0    = (cmph_uint32 *)calloc(nflushes, sizeof(cmph_uint32));
-	filename = (char *)calloc(strlen(brz->tmp_dir) + 11, sizeof(char));
+	
-	sprintf(filename, "%stmpg.cmph",brz->tmp_dir);
-        tmp_fd = fopen(filename, "w");
-	free(filename);
 	memory_usage = 0;
 	for(i = 0; i < nflushes; i++)
 	{
-		filename = (char *)calloc(strlen(brz->tmp_dir) + 11, sizeof(char));
+		filename = (char *)calloc(strlen((char *)(brz->tmp_dir)) + 11, sizeof(char));
 		sprintf(filename, "%s%u.cmph",brz->tmp_dir, i);
-		tmp_fds[i] = fopen(filename, "rb");
+		buffer_manage_open(buff_manage, i, filename);
 		free(filename);
 		filename = NULL;
-		key = brz_read_key(tmp_fds[i]);
+		key = (char *)buffer_manage_read_key(buff_manage, i);
 		keylen = strlen(key);
-		h3 = hash(brz->h3, key, keylen) % brz->k;
+		h0 = hash(brz->h0, key, keylen) % brz->k;
-		buffer_h3[i] = h3;
+		buffer_h0[i] = h0;
 		buffer_merge[i] = (cmph_uint8 *)calloc(keylen + 1, sizeof(cmph_uint8));
 		memcpy(buffer_merge[i], key, keylen + 1);
 		free(key);
 	}
-	
 	e = 0;
 	keys_vd = (char **)calloc(MAX_BUCKET_SIZE, sizeof(char *));
 	nkeys_vd = 0;
 	while(e < brz->m)
 	{
-		i = brz_min_index(buffer_h3, nflushes);
+		i = brz_min_index(buffer_h0, nflushes);
-		cur_bucket = buffer_h3[i];
+		cur_bucket = buffer_h0[i];
-		key = brz_read_key(tmp_fds[i]);
+		key = (char *)buffer_manage_read_key(buff_manage, i);
 		if(key)
 		{
 			while(key)
 			{
 				keylen = strlen(key);
-				h3 = hash(brz->h3, key, keylen) % brz->k;
+				h0 = hash(brz->h0, key, keylen) % brz->k;				
-				
+				if (h0 != buffer_h0[i]) break;				
-				if (h3 != buffer_h3[i]) break;
-				
 				keys_vd[nkeys_vd++] = key;
+				key = NULL; //transfer memory ownership
 				e++;
-				key = brz_read_key(tmp_fds[i]);
+				key = (char *)buffer_manage_read_key(buff_manage, i);
 			}
 			if (key)
 			{
 				assert(nkeys_vd < brz->size[cur_bucket]);
-				keys_vd[nkeys_vd++] = buffer_merge[i];
+				keys_vd[nkeys_vd++] = (char *)buffer_merge[i];
+				buffer_merge[i] = NULL; //transfer memory ownership
 				e++;
-				buffer_h3[i] = h3;
+				buffer_h0[i] = h0;
 				buffer_merge[i] = (cmph_uint8 *)calloc(keylen + 1, sizeof(cmph_uint8));
 				memcpy(buffer_merge[i], key, keylen + 1);
 				free(key);
@@ -390,10 +402,10 @@ static int brz_gen_graphs(cmph_config_t *mph)
 		if(!key)
 		{
 			assert(nkeys_vd < brz->size[cur_bucket]);
-			keys_vd[nkeys_vd++] = buffer_merge[i];
+			keys_vd[nkeys_vd++] = (char *)buffer_merge[i];
+			buffer_merge[i] = NULL; //transfer memory ownership
 			e++;
-			buffer_h3[i] = UINT_MAX;
+			buffer_h0[i] = UINT_MAX;
-			buffer_merge[i] = NULL;
 		}
 		
 		if(nkeys_vd == brz->size[cur_bucket]) // Generating mphf for each bucket.
@@ -402,35 +414,33 @@ static int brz_gen_graphs(cmph_config_t *mph)
 			cmph_config_t *config = NULL;
 			cmph_t *mphf_tmp = NULL;
 			bmz8_data_t * bmzf = NULL;
+			char *bufmphf = NULL;
+			cmph_uint32 buflenmphf = 0;
 			// Source of keys
-			if(nkeys_vd > max_size) max_size = nkeys_vd;
 			source = cmph_io_vector_adapter(keys_vd, (cmph_uint32)nkeys_vd);
 			config = cmph_config_new(source);
 			cmph_config_set_algo(config, CMPH_BMZ8);
 			cmph_config_set_graphsize(config, brz->c);
 			mphf_tmp = cmph_new(config);
 			bmzf = (bmz8_data_t *)mphf_tmp->data;
-			brz_copy_partial_mphf(brz, bmzf, cur_bucket, source);
+			bufmphf = brz_copy_partial_mphf(brz, bmzf, cur_bucket,  &buflenmphf);
-			memory_usage += brz->size[cur_bucket];
+			bmzf = NULL;
-			if((cur_bucket+1 == brz->k)||(memory_usage > brz->memory_availability))
+		        fwrite(bufmphf, buflenmphf, 1, brz->mphf_fd);
-			{
+			free(bufmphf);
-				brz_flush_g(brz, &start_index, tmp_fd);
+			bufmphf = NULL;
-				memory_usage = 0;
-			}
 			cmph_config_destroy(config);
-			brz_destroy_keys_vd(keys_vd, nkeys_vd);
+ 			brz_destroy_keys_vd(keys_vd, nkeys_vd);
 			cmph_destroy(mphf_tmp);
-			free(source);
+			cmph_io_vector_adapter_destroy(source);
+			
 			nkeys_vd = 0;
 		}
 	}
-	fclose(tmp_fd);
+
-	for(i = 0; i < nflushes; i++) fclose(tmp_fds[i]);
+	buffer_manage_destroy(buff_manage);
-	free(tmp_fds);
 	free(keys_vd);
 	free(buffer_merge);
-	free(buffer_h3);
+	free(buffer_h0);
-	fprintf(stderr, "Maximal Size: %u\n", max_size);
 	return 1;
 }
 
@@ -467,7 +477,7 @@ static char * brz_read_key(FILE * fd)
 static void brz_destroy_keys_vd(char ** keys_vd, cmph_uint8 nkeys)
 {
 	cmph_uint8 i;
-	for(i = 0; i < nkeys; i++) free(keys_vd[i]);
+	for(i = 0; i < nkeys; i++) { free(keys_vd[i]); keys_vd[i] = NULL;}
 }
 
 static void brz_flush_g(brz_config_data_t *brz, cmph_uint32 *start_index, FILE * fd)
@@ -481,93 +491,84 @@ static void brz_flush_g(brz_config_data_t *brz, cmph_uint32 *start_index, FILE *
 	}
 }
 
-static void brz_copy_partial_mphf(brz_config_data_t *brz, bmz8_data_t * bmzf, cmph_uint32 index, cmph_io_adapter_t *source)
+static char * brz_copy_partial_mphf(brz_config_data_t *brz, bmz8_data_t * bmzf, cmph_uint32 index,  cmph_uint32 *buflen)
+{
+	cmph_uint32 i;
+	cmph_uint32 buflenh1 = 0;
+	cmph_uint32 buflenh2 = 0; 
+	char * bufh1 = NULL;
+	char * bufh2 = NULL;
+	char * buf   = NULL;
+	cmph_uint32 n = ceil(brz->c * brz->size[index]);
+	hash_state_dump(bmzf->hashes[0], &bufh1, &buflenh1);
+	hash_state_dump(bmzf->hashes[1], &bufh2, &buflenh2);
+	*buflen = buflenh1 + buflenh2 + n + 2*sizeof(cmph_uint32);
+	buf = (char *)malloc(*buflen);
+	//fprintf(stderr,"entrei passei\n");
+	memcpy(buf, &buflenh1, sizeof(cmph_uint32));
+	memcpy(buf+sizeof(cmph_uint32), bufh1, buflenh1);
+	memcpy(buf+sizeof(cmph_uint32)+buflenh1, &buflenh2, sizeof(cmph_uint32));
+	memcpy(buf+2*sizeof(cmph_uint32)+buflenh1, bufh2, buflenh2);
+	memcpy(buf+2*sizeof(cmph_uint32)+buflenh1+buflenh2,bmzf->g, n);
+	free(bufh1);
+	free(bufh2);
+	return buf;
+}
+/*static void brz_copy_partial_mphf(brz_config_data_t *brz, bmz8_data_t * bmzf, cmph_uint32 index)
 {
 	cmph_uint32 i;
 	cmph_uint32 n = ceil(brz->c * brz->size[index]);
-
+	if( brz->g[index]) {fprintf(stderr, "index:%u\n",index);exit(10);}
 	brz->g[index] = (cmph_uint8 *)calloc(n, sizeof(cmph_uint8));
 	for(i = 0; i < n; i++)
 	{
 		brz->g[index][i] = bmzf->g[i];
 		//fprintf(stderr, "gsrc[%u]: %u  gdest: %u\n", i, (cmph_uint8) bmzf->g[i], brz->g[index][i]);
-	}	
+        }
-	brz->h1[index] = hash_state_copy(bmzf->hashes[0]);
+        brz->h1[index] = hash_state_copy(bmzf->hashes[0]);
-	brz->h2[index] = hash_state_copy(bmzf->hashes[1]);
+        brz->h2[index] = hash_state_copy(bmzf->hashes[1]);
 }
-
+*/
 int brz_dump(cmph_t *mphf, FILE *fd)
 {
+	brz_data_t *data = (brz_data_t *)mphf->data;
 	char *buf = NULL;
 	cmph_uint32 buflen;
-	cmph_uint32 i;
-	brz_data_t *data = (brz_data_t *)mphf->data;
-	FILE * tmpg_fd = NULL;
-	char * filename = NULL;
-	filename = (char *)calloc(strlen(data->tmp_dir) + 11, sizeof(char));
-        sprintf(filename, "%stmpg.cmph",data->tmp_dir);
-	tmpg_fd = fopen(filename, "rb");
-        free(filename);
 	DEBUGP("Dumping brzf\n");
-	__cmph_dump(mphf, fd);
+	// The initial part of the MPHF have already been dumped to disk during construction
-
+	// Dumping h0
-	fwrite(&(data->k), sizeof(cmph_uint32), 1, fd);
+        hash_state_dump(data->h0, &buf, &buflen);
-	//dumping h1 and h2.
+        DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
-	for(i = 0; i < data->k; i++)
+        fwrite(&buflen, sizeof(cmph_uint32), 1, fd);
-	{
+        fwrite(buf, buflen, 1, fd);
-		// h1
+        free(buf);
-		hash_state_dump(data->h1[i], &buf, &buflen);	
+	// Dumping m and the vector offset.
-		DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
+	fwrite(&(data->m), sizeof(cmph_uint32), 1, fd);	
-		fwrite(&buflen, sizeof(cmph_uint32), 1, fd);
-		fwrite(buf, buflen, 1, fd);
-		free(buf);
-		// h2
-		hash_state_dump(data->h2[i], &buf, &buflen);
-		DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
-		fwrite(&buflen, sizeof(cmph_uint32), 1, fd);
-		fwrite(buf, buflen, 1, fd);
-		free(buf);
-	}
-	// Dumping h3.
-	hash_state_dump(data->h3, &buf, &buflen);
-	DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
-	fwrite(&buflen, sizeof(cmph_uint32), 1, fd);
-	fwrite(buf, buflen, 1, fd);
-	free(buf);
-	
-	// Dumping c, m, size vector and offset vector.
-	fwrite(&(data->c), sizeof(cmph_float32), 1, fd);
-	fwrite(&(data->m), sizeof(cmph_uint32), 1, fd);
-	fwrite(data->size, sizeof(cmph_uint8)*(data->k), 1, fd);
 	fwrite(data->offset, sizeof(cmph_uint32)*(data->k), 1, fd);
-	
-	// Dumping g function.
-	for(i = 0; i < data->k; i++)
-	{
-		cmph_uint32 n = ceil(data->c * data->size[i]);
-		buf = (char *)calloc(n, sizeof(cmph_uint8));
-		fread(buf, sizeof(cmph_uint8), n, tmpg_fd);
-		fwrite(buf, sizeof(cmph_uint8), n, fd);
-		free(buf);
-	}
-	fclose(tmpg_fd);
 	return 1;
 }
 
+
+
+
 void brz_load(FILE *f, cmph_t *mphf)
 {
 	char *buf = NULL;
 	cmph_uint32 buflen;
-	cmph_uint32 i;
+	cmph_uint32 i, n;
 	brz_data_t *brz = (brz_data_t *)malloc(sizeof(brz_data_t));
 
 	DEBUGP("Loading brz mphf\n");
 	mphf->data = brz;
+	fread(&(brz->c), sizeof(cmph_float32), 1, f);
 	fread(&(brz->k), sizeof(cmph_uint32), 1, f);
+	brz->size   = (cmph_uint8 *) malloc(sizeof(cmph_uint8)*brz->k);
+	fread(brz->size, sizeof(cmph_uint8)*(brz->k), 1, f);	
 	brz->h1 = (hash_state_t **)malloc(sizeof(hash_state_t *)*brz->k);
 	brz->h2 = (hash_state_t **)malloc(sizeof(hash_state_t *)*brz->k);
+	brz->g  = (cmph_uint8 **)  calloc(brz->k, sizeof(cmph_uint8 *));
 	DEBUGP("Reading %u h1 and %u h2\n", brz->k, brz->k);
-	//loading h1 and h2.
+	//loading h_i1, h_i2 and g_i.
 	for(i = 0; i < brz->k; i++)
 	{
 		// h1
@@ -583,69 +584,62 @@ void brz_load(FILE *f, cmph_t *mphf)
 		buf = (char *)malloc(buflen);
 		fread(buf, buflen, 1, f);
 		brz->h2[i] = hash_state_load(buf, buflen);
-		free(buf);		
+		free(buf);
+		n = ceil(brz->c * brz->size[i]);
+		DEBUGP("g_i has %u bytes\n", n);
+		brz->g[i] = (cmph_uint8 *)calloc(n, sizeof(cmph_uint8));
+		fread(brz->g[i], sizeof(cmph_uint8)*n, 1, f);
 	}
-	//loading h3
+	//loading h0
 	fread(&buflen, sizeof(cmph_uint32), 1, f);
 	DEBUGP("Hash state has %u bytes\n", buflen);
 	buf = (char *)malloc(buflen);
 	fread(buf, buflen, 1, f);
-	brz->h3 = hash_state_load(buf, buflen);
+	brz->h0 = hash_state_load(buf, buflen);
-	free(buf);		
+	free(buf);
 
-	//loading c, m, size vector and offset vector.
+	//loading c, m, and the vector offset.	
-	fread(&(brz->c), sizeof(cmph_float32), 1, f);
 	fread(&(brz->m), sizeof(cmph_uint32), 1, f);
-	brz->size   = (cmph_uint8 *) malloc(sizeof(cmph_uint8)*brz->k);
 	brz->offset = (cmph_uint32 *)malloc(sizeof(cmph_uint32)*brz->k);
-	fread(brz->size, sizeof(cmph_uint8)*(brz->k), 1, f);
+	fread(brz->offset, sizeof(cmph_uint32)*(brz->k), 1, f);	
-	fread(brz->offset, sizeof(cmph_uint32)*(brz->k), 1, f);
-	
-	//loading g function.
-	brz->g  = (cmph_uint8 **)  malloc(sizeof(cmph_uint8 *)*brz->k);
-	for(i = 0; i < brz->k; i++)
-	{
-		cmph_uint32 n = ceil(brz->c * brz->size[i]);
-		brz->g[i] = (cmph_uint8 *)malloc(sizeof(cmph_uint8)*n);
-		fread(brz->g[i], sizeof(cmph_uint8)*n, 1, f);
-	}
 	return;
 }
-		
 
 cmph_uint32 brz_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
 {
 	brz_data_t *brz = mphf->data;	
-	cmph_uint32 h3 = hash(brz->h3, key, keylen) % brz->k;
+	cmph_uint32 h0 = hash(brz->h0, key, keylen) % brz->k;
-	cmph_uint32 m = brz->size[h3];
+	cmph_uint32 m = brz->size[h0];
 	cmph_uint32 n = ceil(brz->c * m);
-	cmph_uint32 h1 = hash(brz->h1[h3], key, keylen) % n;
+	cmph_uint32 h1 = hash(brz->h1[h0], key, keylen) % n;
-	cmph_uint32 h2 = hash(brz->h2[h3], key, keylen) % n;
+	cmph_uint32 h2 = hash(brz->h2[h0], key, keylen) % n;
 	cmph_uint8 mphf_bucket;
 	if (h1 == h2 && ++h2 >= n) h2 = 0;
-	mphf_bucket = brz->g[h3][h1] + brz->g[h3][h2]; 
+	mphf_bucket = brz->g[h0][h1] + brz->g[h0][h2]; 
-	DEBUGP("key: %s h1: %u h2: %u h3: %u\n", key, h1, h2, h3);
+	DEBUGP("key: %s h1: %u h2: %u h0: %u\n", key, h1, h2, h0);
-	DEBUGP("key: %s g[h1]: %u g[h2]: %u offset[h3]: %u edges: %u\n", key, brz->g[h3][h1], brz->g[h3][h2], brz->offset[h3], brz->m);
+	DEBUGP("key: %s g[h1]: %u g[h2]: %u offset[h0]: %u edges: %u\n", key, brz->g[h0][h1], brz->g[h0][h2], brz->offset[h0], brz->m);
-	DEBUGP("Address: %u\n", mphf_bucket + brz->offset[h3]);
+	DEBUGP("Address: %u\n", mphf_bucket + brz->offset[h0]);
-	return (mphf_bucket + brz->offset[h3]);
+	return (mphf_bucket + brz->offset[h0]);
 }
 void brz_destroy(cmph_t *mphf)
 {
 	cmph_uint32 i;
 	brz_data_t *data = (brz_data_t *)mphf->data;
-	for(i = 0; i < data->k; i++)
+	if(data->g)
 	{
-		free(data->g[i]);
+		for(i = 0; i < data->k; i++)
-		hash_state_destroy(data->h1[i]);
+		{
-		hash_state_destroy(data->h2[i]);
+			free(data->g[i]);
+			hash_state_destroy(data->h1[i]);
+			hash_state_destroy(data->h2[i]);
+		}
+		free(data->g);
+		free(data->h1);
+		free(data->h2);
 	}
-	hash_state_destroy(data->h3);
+	hash_state_destroy(data->h0);
-	free(data->g);	
-	free(data->h1);
-	free(data->h2);
 	free(data->size);
 	free(data->offset);
-	free(data->tmp_dir);
 	free(data);
 	free(mphf);
 }

src/brz.h

@@ -9,6 +9,8 @@ typedef struct __brz_config_data_t brz_config_data_t;
 brz_config_data_t *brz_config_new();
 void brz_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs);
 void brz_config_set_tmp_dir(cmph_config_t *mph, cmph_uint8 *tmp_dir);
+void brz_config_set_mphf_fd(cmph_config_t *mph, FILE *mphf_fd);
+void brz_config_set_b(cmph_config_t *mph, cmph_uint8 b);
 void brz_config_set_memory_availability(cmph_config_t *mph, cmph_uint32 memory_availability);
 void brz_config_destroy(cmph_config_t *mph);
 cmph_t *brz_new(cmph_config_t *mph, float c);

src/brz_structs.h

@@ -13,8 +13,7 @@ struct __brz_data_t
 	cmph_uint32 k;       // number of components
 	hash_state_t **h1;
 	hash_state_t **h2;
-	hash_state_t * h3;
+	hash_state_t * h0;
-	cmph_uint8 * tmp_dir; // temporary directory    
 };
 
 struct __brz_config_data_t
@@ -25,12 +24,14 @@ struct __brz_config_data_t
 	cmph_uint8  *size;   // size[i] stores the number of edges represented by g[i][...]. 
 	cmph_uint32 *offset; // offset[i] stores the sum: size[0] + size[1] + ... size[i-1].
 	cmph_uint8 **g;      // g function. 
+	cmph_uint8  b;       // parameter b. 
 	cmph_uint32 k;       // number of components
 	hash_state_t **h1;
 	hash_state_t **h2;
-	hash_state_t * h3;    
+	hash_state_t * h0;    
 	cmph_uint32 memory_availability; 
 	cmph_uint8 * tmp_dir; // temporary directory 
+	FILE * mphf_fd; // mphf file
 };
 
 #endif

src/cmph.c

@@ -49,7 +49,8 @@ static int key_nlfile_read(void *data, char **key, cmph_uint32 *keylen)
 
 static int key_vector_read(void *data, char **key, cmph_uint32 *keylen)
 {
-	cmph_vector_t *cmph_vector = (cmph_vector_t *)data;
+/*
+        cmph_vector_t *cmph_vector = (cmph_vector_t *)data;
 	char **keys_vd = (char **)cmph_vector->vector;
 	
 	if (keys_vd + cmph_vector->position == NULL) return -1;
@@ -57,7 +58,17 @@ static int key_vector_read(void *data, char **key, cmph_uint32 *keylen)
 	*key = (char *)malloc(*keylen + 1);
 	strcpy(*key, *(keys_vd + cmph_vector->position));
 	cmph_vector->position = cmph_vector->position + 1;
+*/
+        cmph_vector_t *cmph_vector = (cmph_vector_t *)data;
+        char **keys_vd = (char **)cmph_vector->vector;
+
+//        if (keys_vd + cmph_vector->position == NULL) return -1;
+        *keylen = strlen(keys_vd[cmph_vector->position]);
+        *key = (char *)malloc(*keylen + 1);
+        strcpy(*key, keys_vd[cmph_vector->position]);
+        cmph_vector->position = cmph_vector->position + 1;
 	return *keylen;
+
 }
 
 
@@ -68,7 +79,7 @@ static void key_nlfile_dispose(void *data, char *key, cmph_uint32 keylen)
 
 static void key_vector_dispose(void *data, char *key, cmph_uint32 keylen)
 {
-	key_nlfile_dispose(data, key, keylen);
+	free(key);
 }
 
 static void key_nlfile_rewind(void *data)
@@ -236,7 +247,43 @@ void cmph_config_set_tmp_dir(cmph_config_t *mph, cmph_uint8 *tmp_dir)
 		default:
 			assert(0);
 	}
+}
 
+
+void cmph_config_set_mphf_fd(cmph_config_t *mph, FILE *mphf_fd)
+{
+	switch (mph->algo)
+	{
+		case CMPH_CHM:
+			break;
+		case CMPH_BMZ: /* included -- Fabiano */
+			break;
+		case CMPH_BMZ8: /* included -- Fabiano */
+			break;
+		case CMPH_BRZ: /* included -- Fabiano */
+			brz_config_set_mphf_fd(mph, mphf_fd);
+			break;
+		default:
+			assert(0);
+	}
+}
+
+void cmph_config_set_b(cmph_config_t *mph, cmph_uint8 b)
+{
+	switch (mph->algo)
+	{
+		case CMPH_CHM:
+			break;
+		case CMPH_BMZ: /* included -- Fabiano */
+			break;
+		case CMPH_BMZ8: /* included -- Fabiano */
+			break;
+		case CMPH_BRZ: /* included -- Fabiano */
+			brz_config_set_b(mph, b);
+			break;
+		default:
+			assert(0);
+	}
 }
 
 void cmph_config_set_memory_availability(cmph_config_t *mph, cmph_uint32 memory_availability)

src/cmph.h

@@ -41,6 +41,8 @@ void cmph_config_set_verbosity(cmph_config_t *mph, cmph_uint32 verbosity);
 void cmph_config_set_graphsize(cmph_config_t *mph, float c);
 void cmph_config_set_algo(cmph_config_t *mph, CMPH_ALGO algo);
 void cmph_config_set_tmp_dir(cmph_config_t *mph, cmph_uint8 *tmp_dir);
+void cmph_config_set_mphf_fd(cmph_config_t *mph, FILE *mphf_fd);
+void cmph_config_set_b(cmph_config_t *mph, cmph_uint8 b);
 void cmph_config_set_memory_availability(cmph_config_t *mph, cmph_uint32 memory_availability);
 void cmph_config_destroy(cmph_config_t *mph);
 

src/jenkins_hash.c

@@ -89,9 +89,6 @@ jenkins_state_t *jenkins_state_new(cmph_uint32 size) //size of hash table
 	jenkins_state_t *state = (jenkins_state_t *)malloc(sizeof(jenkins_state_t));
 	DEBUGP("Initializing jenkins hash\n");
 	state->seed = rand() % size;
-	state->nbits = (cmph_uint32)ceil(log(size)/M_LOG2E);
-	state->size = size;
-	DEBUGP("Initialized jenkins with size %u, nbits %u and seed %u\n", size, state->nbits, state->seed);
 	return state;
 }
 void jenkins_state_destroy(jenkins_state_t *state)
@@ -164,7 +161,7 @@ cmph_uint32 jenkins_hash(jenkins_state_t *state, const char *k, cmph_uint32 keyl
 
 void jenkins_state_dump(jenkins_state_t *state, char **buf, cmph_uint32 *buflen)
 {
-	*buflen = sizeof(cmph_uint32)*3;
+	*buflen = sizeof(cmph_uint32);
 	*buf = malloc(*buflen);
 	if (!*buf) 
 	{
@@ -172,10 +169,7 @@ void jenkins_state_dump(jenkins_state_t *state, char **buf, cmph_uint32 *buflen)
 		return;
 	}
 	memcpy(*buf, &(state->seed), sizeof(cmph_uint32));
-	memcpy(*buf + sizeof(cmph_uint32), &(state->nbits), sizeof(cmph_uint32));
-	memcpy(*buf + sizeof(cmph_uint32)*2, &(state->size), sizeof(cmph_uint32));
 	DEBUGP("Dumped jenkins state with seed %u\n", state->seed);
-
 	return;
 }
 
@@ -184,8 +178,6 @@ jenkins_state_t *jenkins_state_copy(jenkins_state_t *src_state)
 	jenkins_state_t *dest_state = (jenkins_state_t *)malloc(sizeof(jenkins_state_t));
 	dest_state->hashfunc = src_state->hashfunc;
 	dest_state->seed = src_state->seed;
-	dest_state->nbits = src_state->nbits;
-	dest_state->size = src_state->size;
 	return dest_state;
 }
 
@@ -193,8 +185,6 @@ jenkins_state_t *jenkins_state_load(const char *buf, cmph_uint32 buflen)
 {
 	jenkins_state_t *state = (jenkins_state_t *)malloc(sizeof(jenkins_state_t));
 	state->seed = *(cmph_uint32 *)buf;
-	state->nbits = *(((cmph_uint32 *)buf) + 1);
-	state->size = *(((cmph_uint32 *)buf) + 2);
 	state->hashfunc = CMPH_HASH_JENKINS;
 	DEBUGP("Loaded jenkins state with seed %u\n", state->seed);
 	return state;

src/jenkins_hash.h

@@ -7,8 +7,6 @@ typedef struct __jenkins_state_t
 {
 	CMPH_HASH hashfunc;
 	cmph_uint32 seed;
-	cmph_uint32 nbits;
-	cmph_uint32 size;
 } jenkins_state_t;
 	
 jenkins_state_t *jenkins_state_new(cmph_uint32 size); //size of hash table

src/main.c

@@ -22,12 +22,12 @@
 
 void usage(const char *prg)
 {
-	fprintf(stderr, "usage: %s [-v] [-h] [-V] [-k nkeys] [-f hash_function] [-g [-c value][-s seed] ] [-a algorithm] [-M memory_in_MB] [-d tmp_dir] [-m file.mph]  keysfile\n", prg);   
+	fprintf(stderr, "usage: %s [-v] [-h] [-V] [-k nkeys] [-f hash_function] [-g [-c value][-s seed] ] [-a algorithm] [-M memory_in_MB] [-b BRZ_parameter] [-d tmp_dir] [-m file.mph]  keysfile\n", prg);   
 }
 void usage_long(const char *prg)
 {
 	cmph_uint32 i;
-	fprintf(stderr, "usage: %s [-v] [-h] [-V] [-k nkeys] [-f hash_function] [-g [-c value][-s seed] ] [-a algorithm] [-M memory_in_MB] [-d tmp_dir] [-m file.mph] keysfile\n", prg);   
+	fprintf(stderr, "usage: %s [-v] [-h] [-V] [-k nkeys] [-f hash_function] [-g [-c value][-s seed] ] [-a algorithm] [-M memory_in_MB] [-b BRZ_parameter] [-d tmp_dir] [-m file.mph] keysfile\n", prg);   
 	fprintf(stderr, "Minimum perfect hashing tool\n\n"); 
 	fprintf(stderr, "  -h\t print this help message\n");
 	fprintf(stderr, "  -c\t c value that determines the number of vertices in the graph\n");
@@ -43,13 +43,13 @@ void usage_long(const char *prg)
 	fprintf(stderr, "  -m\t minimum perfect hash function file \n");
 	fprintf(stderr, "  -M\t main memory availability (in MB)\n");
 	fprintf(stderr, "  -d\t temporary directory used in brz algorithm \n");
+	fprintf(stderr, "  -b\t parmeter of BRZ algorithm to make the maximal number of keys in a bucket lower than 256\n");
 	fprintf(stderr, "  keysfile\t line separated file with keys\n");
 }
 
-
 int main(int argc, char **argv)
 {
-	char verbosity = 0;		
+	char verbosity = 0;
 	char generate = 0;
 	char *mphf_file = NULL;
 	FILE *mphf_fd = stdout;
@@ -67,9 +67,10 @@ int main(int argc, char **argv)
 	cmph_uint8 * tmp_dir = NULL;
 	cmph_io_adapter_t *source;
 	cmph_uint32 memory_availability = 0;
+	cmph_uint32 b = 128;
 	while (1)
 	{
-		char ch = getopt(argc, argv, "hVvgc:k:a:M:f:m:d:s:");
+		char ch = getopt(argc, argv, "hVvgc:k:a:M:b:f:m:d:s:");
 		if (ch == -1) break;
 		switch (ch)
 		{
@@ -122,6 +123,16 @@ int main(int argc, char **argv)
 					}
 				}
 				break;
+			case 'b':
+				{
+					char *cptr;
+					b = strtoul(optarg, &cptr, 10);
+					if(*cptr != 0) {
+						fprintf(stderr, "Parameter b was not found: %s\n", optarg);
+						exit(1);
+					}
+				}
+				break;
 			case 'v':
 				++verbosity;
 				break;
@@ -184,9 +195,9 @@ int main(int argc, char **argv)
 		return 1;
 	}
 	keys_file = argv[optind];
+  
 	if (seed == UINT_MAX) seed = (cmph_uint32)time(NULL);
 	srand(seed);
-
 	int ret = 0;
 	if (mphf_file == NULL)
 	{
@@ -196,6 +207,7 @@ int main(int argc, char **argv)
 	}	
 
 	keys_fd = fopen(keys_file, "r");
+
 	if (keys_fd == NULL)
 	{
 		fprintf(stderr, "Unable to open file %s: %s\n", keys_file, strerror(errno));
@@ -209,33 +221,35 @@ int main(int argc, char **argv)
 	if (generate)
 	{
 		//Create mphf
+		mphf_fd = fopen(mphf_file, "w");
 		config = cmph_config_new(source);
 		cmph_config_set_algo(config, mph_algo);
 		if (nhashes) cmph_config_set_hashfuncs(config, hashes);
 		cmph_config_set_verbosity(config, verbosity);
 		cmph_config_set_tmp_dir(config, tmp_dir);
+		cmph_config_set_mphf_fd(config, mphf_fd);
 		cmph_config_set_memory_availability(config, memory_availability);
+		cmph_config_set_b(config, b);
 		if(mph_algo == CMPH_BMZ && c >= 2.0) c=1.15;
 		if (c != 0) cmph_config_set_graphsize(config, c);
 		mphf = cmph_new(config);
-
+		cmph_config_destroy(config);
 		if (mphf == NULL)
 		{
 			fprintf(stderr, "Unable to create minimum perfect hashing function\n");
-			cmph_config_destroy(config);
+			//cmph_config_destroy(config);
 			free(mphf_file);
 			return -1;
 		}
 
-		mphf_fd = fopen(mphf_file, "w");
 		if (mphf_fd == NULL)
 		{
 			fprintf(stderr, "Unable to open output file %s: %s\n", mphf_file, strerror(errno));
 			free(mphf_file);
 			return -1;
 		}
-		cmph_dump(mphf, mphf_fd);
+		cmph_dump(mphf, mphf_fd); 
-		cmph_destroy(mphf);
+		cmph_destroy(mphf);	
 		fclose(mphf_fd);
 	}
 	else
@@ -289,6 +303,7 @@ int main(int argc, char **argv)
 	fclose(keys_fd);
 	free(mphf_file);
 	free(tmp_dir);
-	free(source);
+        cmph_io_nlfile_adapter_destroy(source);
 	return ret;
+  
 }

src/vqueue.c

@@ -46,5 +46,5 @@ void vqueue_print(vqueue_t * q)
 
 void vqueue_destroy(vqueue_t *q)
 {
-  free(q->values); q->values = NULL;
+  free(q->values); q->values = NULL; free(q);
 }

vldb/pt/figs/brz.fig

@@ -8,96 +8,79 @@ Single
 -2
 1200 2
 0 32 #bebebe
-6 3285 3600 3555 4230
+6 2025 3015 3555 3690
-6 3285 3780 3555 4230
-2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-	 3285 4140 3555 4140 3555 4230 3285 4230 3285 4140
-2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-	 3285 4050 3555 4050 3555 4140 3285 4140 3285 4050
-2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-	 3285 3960 3555 3960 3555 4050 3285 4050 3285 3960
-2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-	 3285 3870 3555 3870 3555 3960 3285 3960 3285 3870
-2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-	 3285 3780 3555 3780 3555 3870 3285 3870 3285 3780
--6
-2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-	 3285 3690 3555 3690 3555 3780 3285 3780 3285 3690
-2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-	 3285 3600 3555 3600 3555 3690 3285 3690 3285 3600
--6
-6 1800 4500 3330 5175
 2 3 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 8
-	 1800 4770 2070 4770 2070 4500 3060 4500 3060 4770 3330 4770
+	 2025 3285 2295 3285 2295 3015 3285 3015 3285 3285 3555 3285
-	 2565 5175 1800 4770
+	 2790 3690 2025 3285
-4 0 0 50 -1 0 10 0.0000 4 150 600 2265 4867 Spreading\001
+4 0 0 50 -1 0 10 0.0000 4 135 765 2385 3330 Partitioning\001
 -6
-6 2250 3060 2880 3600
+6 1890 3735 3780 4365
-6 2250 3060 2880 3600
+6 2430 3735 2700 4365
-6 2250 3060 2880 3600
+6 2430 3915 2700 4365
-6 2250 3060 2880 3600
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-2 3 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 8
+	 2430 4275 2700 4275 2700 4365 2430 4365 2430 4275
-	 2250 3330 2430 3330 2430 3060 2700 3060 2700 3330 2880 3330
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-	 2565 3600 2250 3330
+	 2430 4185 2700 4185 2700 4275 2430 4275 2430 4185
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
+	 2430 4095 2700 4095 2700 4185 2430 4185 2430 4095
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
+	 2430 4005 2700 4005 2700 4095 2430 4095 2430 4005
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
+	 2430 3915 2700 3915 2700 4005 2430 4005 2430 3915
 -6
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
+	 2430 3825 2700 3825 2700 3915 2430 3915 2430 3825
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
+	 2430 3735 2700 3735 2700 3825 2430 3825 2430 3735
 -6
-4 0 0 50 -1 0 10 0.0000 4 105 75 2521 3382 h\001
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
--6
+	 1890 4275 2160 4275 2160 4365 1890 4365 1890 4275
-4 0 0 50 -1 0 6 0.0000 4 60 45 2589 3419 1\001
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
--6
+	 1890 4185 2160 4185 2160 4275 1890 4275 1890 4185
-6 1395 2655 3825 2970
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
-2 4 0 1 0 7 50 -1 -1 0.000 0 0 7 0 0 5
+	 2160 4275 2430 4275 2430 4365 2160 4365 2160 4275
-	 3825 2970 3825 2655 1395 2655 1395 2970 3825 2970
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-4 0 0 50 -1 0 10 0.0000 4 135 795 2212 2850 Set of Keys S\001
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--6
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 2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
 	 1260 5400 4230 5400
 2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
@@ -122,14 +105,49 @@ Single
 	 3150 5310 3420 5310 3420 5400 3150 5400 3150 5310
 2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
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 4 0 0 50 -1 0 10 0.0000 4 105 75 1350 5580 0\001
-4 0 0 50 -1 0 10 0.0000 4 105 690 450 5400 Hash Table\001
+-6
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