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authorSumit Bose <sbose@redhat.com>2012-08-09 10:10:42 +0200
committerJakub Hrozek <jhrozek@redhat.com>2012-08-15 15:57:54 +0200
commit60e51fd2764291df2332f36ff478777627d92b57 (patch)
tree23b790c3038b67be9b05555973af1555ccc8c978 /src/python
parent819bb0b77780fc9009608f48ad353a2cb58fa9ac (diff)
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Add python bindings for murmurhash3
Diffstat (limited to 'src/python')
-rw-r--r--src/python/pysss_murmur.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/src/python/pysss_murmur.c b/src/python/pysss_murmur.c
new file mode 100644
index 00000000..1e89681c
--- /dev/null
+++ b/src/python/pysss_murmur.c
@@ -0,0 +1,65 @@
+/*
+ Authors:
+ Sumit Bose <sbose@redhat.com>
+
+ Copyright (C) 2012 Red Hat
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <Python.h>
+
+#include "util/murmurhash3.h"
+
+PyDoc_STRVAR(murmurhash3_doc,
+"murmurhash3(key, key_len, seed) -> 32bit integer hash\n\
+\n\
+Calculate the murmur hash version 3 of the first key_len bytes from key\n\
+using the given seed."
+);
+
+static PyObject * py_murmurhash3(PyObject *module, PyObject *args)
+{
+ const char *key;
+ long key_len;
+ long long seed;
+ uint32_t hash;
+
+ if (!PyArg_ParseTuple(args, "slL", &key, &key_len, &seed)) {
+ PyErr_Format(PyExc_ValueError, "Invalid argument\n");
+ return NULL;
+ }
+
+ if (seed > UINT32_MAX || key_len > INT_MAX || key_len < 0 ||
+ key_len > strlen(key)) {
+ PyErr_Format(PyExc_ValueError, "Invalid value\n");
+ return NULL;
+ }
+
+ hash = murmurhash3(key, key_len, seed);
+
+ return PyLong_FromUnsignedLong((unsigned long) hash);
+}
+
+static PyMethodDef methods[] = {
+ {"murmurhash3", (PyCFunction) py_murmurhash3, METH_VARARGS, murmurhash3_doc},
+ {NULL,NULL, 0, NULL}
+};
+
+
+PyMODINIT_FUNC
+initpysss_murmur(void)
+{
+ Py_InitModule3("pysss_murmur", methods, "murmur hash functions");
+}