| /* |
| * Copyright (c) 2020 Arm Limited. All rights reserved. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the License); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define PY_SSIZE_T_CLEAN |
| #include <Python.h> |
| |
| #include "mlw_decode.h" |
| #include "mlw_encode.h" |
| |
| /* C extension wrapper for mlw_encode |
| * |
| * This method is exposed directly in python with the arguments with a |
| * prototype of the form: |
| * |
| * output = mlw_codec.encode(input, verbose=0) |
| * |
| * input: [int] |
| * verbose: int |
| * output: bytearray |
| */ |
| |
| static PyObject * |
| method_encode (PyObject *self, PyObject *args) |
| { |
| /* Object to hold the input integer list. */ |
| PyObject *input_list_object; |
| |
| /* Object to hold the input verbosity integer, the verbose argument |
| * is optional so defaulted to 0. |
| */ |
| int verbose = 0; |
| |
| /* Arguments to the method are delivered as a tuple, unpack the |
| * tuple to get the individual arguments, note the second is |
| * optional. |
| */ |
| if (!PyArg_ParseTuple(args, "O|i", &input_list_object, &verbose)) |
| return NULL; |
| |
| /* Unpack the length of the input integer list. */ |
| int input_length = PyObject_Length (input_list_object); |
| if (input_length < 0) |
| input_length = 0; |
| |
| /* We need to marshall the integer list into an input buffer |
| * suitable for mlw_encode, use a temporary heap allocated buffer |
| * for that purpose. |
| */ |
| int16_t *input_buffer = (int16_t *) malloc(sizeof(int16_t *) * input_length); |
| if (input_buffer == NULL) |
| return PyErr_NoMemory(); |
| |
| /* Unpack the input integer list into the temporary buffer. |
| */ |
| for (int i = 0; i < input_length; i++) |
| { |
| PyObject *item; |
| item = PyList_GetItem(input_list_object, i); |
| if (!PyLong_Check(item)) |
| input_buffer[i] = 0; |
| input_buffer[i] = PyLong_AsLong(item); |
| } |
| |
| /* We don't know the output length required, we guess worst case, |
| * the mlw_encode call will do a resize (downwards) anyway. |
| */ |
| uint8_t *output_buffer = malloc(input_length); |
| if (output_buffer == NULL) |
| return PyErr_NoMemory(); |
| |
| int output_length = mlw_encode(input_buffer, input_length, &output_buffer, verbose); |
| |
| PyObject *output_byte_array = PyByteArray_FromStringAndSize ((char *) output_buffer, output_length); |
| |
| /* Discard the temporary input and output buffers. */ |
| free (input_buffer); |
| free (output_buffer); |
| |
| return output_byte_array; |
| } |
| |
| /* C extension wrapper for mlw_decode |
| * |
| * This method is exposed directly in python with the arguments with a |
| * prototype of the form: |
| * |
| * output = mlw_codec.decode(input, verbose=0) |
| * |
| * input: bytearray |
| * verbose: int |
| * output: [int] |
| */ |
| |
| static PyObject * |
| method_decode(PyObject *self, PyObject *args) |
| { |
| /* Object to hold the input bytearray. */ |
| PyObject *input_bytearray_object; |
| |
| /* Object to hold the input verbosity integer, the verbose argument |
| * is optional so defaulted to 0. |
| */ |
| int verbose = 0; |
| |
| /* Arguments to the method are delivered as a tuple, unpack the |
| * tuple to get the individual arguments, note the second is |
| * optional. |
| */ |
| if (!PyArg_ParseTuple(args, "Y|i", &input_bytearray_object, &verbose)) |
| return NULL; |
| |
| /* Unpack the input buffer and length from the bytearray object. */ |
| uint8_t *input_buffer = (uint8_t *) PyByteArray_AsString(input_bytearray_object); |
| int input_length = PyByteArray_Size(input_bytearray_object); |
| |
| /* We don't know the output length required, we guess, but the guess |
| * will be too small, the mlw_decode call will do a resize (upwards) |
| * anyway. |
| */ |
| int16_t *output_buffer = malloc (input_length); |
| if (output_buffer == NULL) |
| return PyErr_NoMemory(); |
| |
| int output_length = mlw_decode (input_buffer, input_length, &output_buffer, verbose); |
| |
| /* Construct a new integer list and marshall the output buffer |
| * contents into the list. */ |
| PyObject *output_list = PyList_New(output_length); |
| for (int i = 0; i <output_length; i++) |
| PyList_SetItem (output_list, i, PyLong_FromLong (output_buffer[i])); |
| |
| free (output_buffer); |
| |
| return output_list; |
| } |
| |
| /* mlw_codec method descriptors. |
| */ |
| |
| static PyMethodDef mlw_methods[] = { |
| {"decode", method_decode, METH_VARARGS, "Python interface for decode"}, |
| {"encode", method_encode, METH_VARARGS, "Python interface for encode"}, |
| {NULL, NULL, 0, NULL} |
| }; |
| |
| /* mlw_codec module descriptor. |
| */ |
| |
| static struct PyModuleDef mlw_codecmodule = { |
| PyModuleDef_HEAD_INIT, |
| "mlw_codec", |
| "Python interface for the mlw encoder", |
| -1, |
| mlw_methods |
| }; |
| |
| PyMODINIT_FUNC PyInit_mlw_codec(void) { |
| return PyModule_Create(&mlw_codecmodule); |
| } |