MINOR: sample: add the xxh3 converter
This patch adds support for the XXH3 variant of hash function that
generates a 64-bit hash.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 95b020c..ca4c581 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -16356,6 +16356,15 @@
This prefix is followed by a name. The separator is a '.'. The name may only
contain characters 'a-z', 'A-Z', '0-9', '.' and '_'.
+xxh3([<seed>])
+ Hashes a binary input sample into a signed 64-bit quantity using the XXH3
+ 64-bit variant of the XXhash hash function. This hash supports a seed which
+ defaults to zero but a different value maybe passed as the <seed> argument.
+ This hash is known to be very good and very fast so it can be used to hash
+ URLs and/or URL parameters for use as stick-table keys to collect statistics
+ with a low collision rate, though care must be taken as the algorithm is not
+ considered as cryptographically secure.
+
xxh32([<seed>])
Hashes a binary input sample into an unsigned 32-bit quantity using the 32-bit
variant of the XXHash hash function. This hash supports a seed which defaults
diff --git a/src/sample.c b/src/sample.c
index d1941ce..f70797d 100644
--- a/src/sample.c
+++ b/src/sample.c
@@ -2099,6 +2099,20 @@
return 1;
}
+static int sample_conv_xxh3(const struct arg *arg_p, struct sample *smp, void *private)
+{
+ unsigned long long int seed;
+
+ if (arg_p && arg_p->data.sint)
+ seed = (unsigned long long int)arg_p->data.sint;
+ else
+ seed = 0;
+ smp->data.u.sint = (long long int)XXH3(smp->data.u.str.area,
+ smp->data.u.str.data, seed);
+ smp->data.type = SMP_T_SINT;
+ return 1;
+}
+
/* hashes the binary input into a 32-bit unsigned int */
static int sample_conv_crc32(const struct arg *arg_p, struct sample *smp, void *private)
{
@@ -3959,6 +3973,7 @@
{ "djb2", sample_conv_djb2, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
{ "sdbm", sample_conv_sdbm, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
{ "wt6", sample_conv_wt6, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
+ { "xxh3", sample_conv_xxh3, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
{ "xxh32", sample_conv_xxh32, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
{ "xxh64", sample_conv_xxh64, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
{ "json", sample_conv_json, ARG1(1,STR), sample_conv_json_check, SMP_T_STR, SMP_T_STR },