MINOR: samples: provide a "crc32" converter
This converter hashes a binary input sample into an unsigned 32-bit quantity
using the CRC32 hash function. Optionally, it is possible to apply a full
avalanche hash function to the output if the optional <avalanche> argument
equals 1. This converter uses the same functions as used by the various hash-
based load balancing algorithms, so it will provide exactly the same results.
It is provided for compatibility with other software which want a CRC32 to be
computed on some input keys, so it follows the most common implementation as
found in Ethernet, Gzip, PNG, etc... It is slower than the other algorithms
but may provide a better or at least less predictable distribution.
diff --git a/src/sample.c b/src/sample.c
index 00345a8..377c4c8 100644
--- a/src/sample.c
+++ b/src/sample.c
@@ -1380,6 +1380,16 @@
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)
+{
+ smp->data.uint = hash_crc32(smp->data.str.str, smp->data.str.len);
+ if (arg_p && arg_p->data.uint)
+ smp->data.uint = full_hash(smp->data.uint);
+ smp->type = SMP_T_UINT;
+ return 1;
+}
+
/* This function escape special json characters. The returned string can be
* safely set between two '"' and used as json string. The json string is
* defined like this:
@@ -1867,6 +1877,7 @@
{ "ipmask", sample_conv_ipmask, ARG1(1,MSK4), NULL, SMP_T_IPV4, SMP_T_IPV4 },
{ "ltime", sample_conv_ltime, ARG2(1,STR,SINT), NULL, SMP_T_UINT, SMP_T_STR },
{ "utime", sample_conv_utime, ARG2(1,STR,SINT), NULL, SMP_T_UINT, SMP_T_STR },
+ { "crc32", sample_conv_crc32, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },
{ "djb2", sample_conv_djb2, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },
{ "sdbm", sample_conv_sdbm, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },
{ "wt6", sample_conv_wt6, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },