Added HyperLogLog cardinality estimator API calls

/* Memory lifecycle */
int ndpi_hll_init(struct ndpi_hll *hll, u_int8_t bits);
void ndpi_hll_destroy(struct ndpi_hll *hll);

/* Add values */
void ndpi_hll_add(struct ndpi_hll *hll, const char *data, size_t data_len);
void ndpi_hll_add_number(struct ndpi_hll *hll, u_int32_t value) ;

/* Get cardinality estimation */
double ndpi_hll_count(struct ndpi_hll *hll);

2 files changed, 35 insertions, 0 deletions

diff --git a/src/lib/third_party/include/MurmurHash3.h b/src/lib/third_party/include/MurmurHash3.h
new file mode 100644
index 000000000..a048eb37d
--- /dev/null
+++ b/src/lib/third_party/include/MurmurHash3.h
@@ -0,0 +1,8 @@
+#ifndef _MURMURHASH3_H_
+#define _MURMURHASH3_H_
+
+#include <stdint.h>
+
+uint32_t MurmurHash3_x86_32(const void * key, uint32_t len, uint32_t seed);
+
+#endif
diff --git a/src/lib/third_party/include/hll.h b/src/lib/third_party/include/hll.h
new file mode 100644
index 000000000..00975ec36
--- /dev/null
+++ b/src/lib/third_party/include/hll.h
@@ -0,0 +1,27 @@
+/*
+  Code taken from https://github.com/avz/hll
+  
+  Copyright (c) 2015 Artem Zaytsev <arepo@nologin.ru>
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+  The above copyright notice and this permission notice shall be included
+  in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+  OTHER DEALINGS IN THE SOFTWARE.  
+ */
+
+
+extern int      hll_init(struct ndpi_hll *hll, u_int8_t bits);
+extern void     hll_destroy(struct ndpi_hll *hll);
+extern void     hll_add(struct ndpi_hll *hll, const void *buf, size_t size);
+extern double   hll_count(const struct ndpi_hll *hll);