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/*
* ndpi_bitmap64_fuse.c
*
* Copyright (C) 2011-24 - ntop.org and contributors
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdlib.h>
#include <errno.h>
#include <math.h>
#include <sys/types.h>
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_UNKNOWN
#include "ndpi_config.h"
#include "ndpi_api.h"
#include "third_party/include/binaryfusefilter.h"
#define NDPI_BITMAP64_FUSE_REALLOC_SIZE 4096
// #define PRINT_DUPLICATED_HASHS
typedef struct {
u_int32_t num_allocated_entries, num_used_entries;
u_int64_t *entries;
bool is_compressed;
binary_fuse16_t bitmap;
} ndpi_bitmap64_fuse_t;
/* ********************************************************** */
ndpi_bitmap64_fuse* ndpi_bitmap64_fuse_alloc() {
ndpi_bitmap64_fuse_t *rc = (ndpi_bitmap64_fuse_t*)ndpi_malloc(sizeof(ndpi_bitmap64_fuse_t));
if(!rc) return(rc);
rc->num_allocated_entries = NDPI_BITMAP64_FUSE_REALLOC_SIZE, rc->num_used_entries = 0;
if((rc->entries = (u_int64_t*)ndpi_calloc(rc->num_allocated_entries, sizeof(u_int64_t))) == NULL) {
ndpi_free(rc);
return(NULL);
}
rc->is_compressed = false;
return((ndpi_bitmap64_fuse*)rc);
}
/* ********************************************************** */
static int ndpi_bitmap64_fuse_entry_compare(const void *_a, const void *_b) {
u_int64_t *a = (u_int64_t*)_a, *b = (u_int64_t*)_b;
if(*a < *b) return -1;
else if(*a > *b) return 1;
else return 0;
}
/* ********************************************************** */
/* Sort and compact memory before searching */
bool ndpi_bitmap64_fuse_compress(ndpi_bitmap64_fuse *_b) {
ndpi_bitmap64_fuse_t *b = (ndpi_bitmap64_fuse_t*)_b;
u_int32_t i;
if(!b)
return(false);
if(b->is_compressed)
return(true);
if(b->num_used_entries > 0) {
if(b->num_used_entries > 1)
qsort(b->entries, b->num_used_entries,
sizeof(u_int64_t),
ndpi_bitmap64_fuse_entry_compare);
/* Now remove duplicates */
u_int64_t old_value = b->entries[0], new_len = 1;
for(i=1; i<b->num_used_entries; i++) {
if(b->entries[i] != old_value) {
if(new_len != i)
memcpy(&b->entries[new_len], &b->entries[i], sizeof(u_int64_t));
old_value = b->entries[i];
new_len++;
} else {
#ifdef PRINT_DUPLICATED_HASHS
printf("Skipping duplicate hash %lluu [id: %u/%u]\n",
b->entries[i].value, i, b->num_used_entries);
#endif
}
}
b->num_used_entries = b->num_allocated_entries = new_len;
}
if(binary_fuse16_allocate(b->num_used_entries, &b->bitmap)) {
if(binary_fuse16_populate(b->entries, b->num_used_entries, &b->bitmap)) {
ndpi_free(b->entries), b->num_used_entries = b->num_allocated_entries = 0;
b->entries = NULL;
} else {
binary_fuse16_free(&b->bitmap);
return(false);
}
} else {
return(false);
}
b->is_compressed = true;
return(true);
}
/* ********************************************************** */
bool ndpi_bitmap64_fuse_set(ndpi_bitmap64_fuse *_b, u_int64_t value) {
ndpi_bitmap64_fuse_t *b = (ndpi_bitmap64_fuse_t*)_b;
if(!b)
return(false);
if(b->is_compressed) {
/*
We need to discard the filter and start over as this
datastructure is immutable
*/
binary_fuse16_free(&b->bitmap);
/* No need to call b->is_compressed = false; as it will be set below */
}
if(b->num_used_entries >= b->num_allocated_entries) {
u_int64_t *rc;
u_int32_t new_len = b->num_allocated_entries + NDPI_BITMAP64_FUSE_REALLOC_SIZE;
rc = (u_int64_t*)ndpi_realloc(b->entries,
sizeof(u_int64_t)*b->num_allocated_entries,
sizeof(u_int64_t)*new_len);
if(rc == NULL) {
b->is_compressed = false;
return(false);
}
b->entries = rc, b->num_allocated_entries = new_len;
}
b->entries[b->num_used_entries] = value;
b->num_used_entries++, b->is_compressed = false;
return(true);
}
/* ********************************************************** */
bool ndpi_bitmap64_fuse_isset(ndpi_bitmap64_fuse *_b, u_int64_t value) {
ndpi_bitmap64_fuse_t *b = (ndpi_bitmap64_fuse_t*)_b;
if(!b)
return(false);
if(!b->is_compressed) {
if(!ndpi_bitmap64_fuse_compress(b))
return(false); /* Compresssion failed */
}
return(binary_fuse16_contain(value, &b->bitmap));
}
/* ********************************************************** */
void ndpi_bitmap64_fuse_free(ndpi_bitmap64_fuse *_b) {
ndpi_bitmap64_fuse_t *b = (ndpi_bitmap64_fuse_t*)_b;
if(!b)
return;
if(b->entries) ndpi_free(b->entries);
if(b->is_compressed)
binary_fuse16_free(&b->bitmap);
ndpi_free(b);
}
/* ********************************************************** */
u_int32_t ndpi_bitmap64_fuse_size(ndpi_bitmap64_fuse *_b) {
ndpi_bitmap64_fuse_t *b = (ndpi_bitmap64_fuse_t*)_b;
if(!b) return(0);
if(!b->is_compressed) {
if(!ndpi_bitmap64_fuse_compress(b))
return(0); /* Compresssion failed */
}
return(sizeof(ndpi_bitmap64_fuse) + binary_fuse16_size_in_bytes(&b->bitmap));
}
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