73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
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#include <Python.h>
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static PyObject * hashFunction(PyObject *self, PyObject *args, PyObject *kw)
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{
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PyStringObject *a;
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register int len;
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register unsigned char *p;
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register long x;
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long lSeed;
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unsigned long cchSeed;
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if (!PyArg_ParseTuple(args, "iiO:hash", &lSeed, &cchSeed, &a))
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return NULL;
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if (!PyString_Check(a))
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{
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PyErr_SetString(PyExc_TypeError, "arg 3 needs to be a string");
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return NULL;
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}
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len = a->ob_size;
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p = (unsigned char *) a->ob_sval;
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x = lSeed;
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while (--len >= 0)
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x = (1000003*x) ^ *p++;
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x ^= a->ob_size + cchSeed;
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if (x == -1)
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x = -2;
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return PyInt_FromLong(x);
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}
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static PyObject * calcSeed(PyObject *self, PyObject *args, PyObject *kw)
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{
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PyStringObject *a;
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register int len;
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register unsigned char *p;
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register long x;
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if (!PyString_Check(args))
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{
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PyErr_SetString(PyExc_TypeError, "arg 1 expected a string, but didn't get it.");
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return NULL;
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}
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a = (PyStringObject *)args;
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len = a->ob_size;
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p = (unsigned char *) a->ob_sval;
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x = *p << 7;
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while (--len >= 0)
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x = (1000003*x) ^ *p++;
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return PyInt_FromLong(x);
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}
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static struct PyMethodDef hashMethods[] = {
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{ "calcSeed", calcSeed, 0, NULL },
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{ "hash", hashFunction, 0, NULL },
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{ NULL, NULL, 0, NULL } /* sentinel */
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};
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#ifdef _MSC_VER
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_declspec(dllexport)
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#endif
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void initperfhash()
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{
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PyObject *m;
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m = Py_InitModule4("perfhash", hashMethods,
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NULL, NULL, PYTHON_API_VERSION);
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if ( m == NULL )
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Py_FatalError("can't initialize module hashModule");
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}
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