Add python bindings for murmurhash3

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");
+}