1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include <math.h>
#include <stdint.h>
void
integer_unpack_u8(Py_buffer *in_view, Py_buffer *out_view)
{
Py_ssize_t in_size = in_view->shape[0];
Py_ssize_t in_index = 0;
Py_ssize_t out_index = 0;
uint8_t *in_data = in_view->buf;
uint32_t *out_data = out_view->buf;
while (in_index < in_size) {
uint32_t sum = in_data[in_index];
if (sum == UINT8_MAX) {
while (in_index + 1 < in_size) {
in_index += 1;
sum += in_data[in_index];
if (in_data[in_index] != UINT8_MAX) {
break;
}
}
}
out_data[out_index] = sum;
in_index += 1;
out_index += 1;
}
}
void
integer_unpack_u16(Py_buffer *in_view, Py_buffer *out_view)
{
Py_ssize_t in_size = in_view->shape[0];
Py_ssize_t in_index = 0;
Py_ssize_t out_index = 0;
uint16_t *in_data = in_view->buf;
uint32_t *out_data = out_view->buf;
while (in_index < in_size) {
uint32_t sum = in_data[in_index];
if (sum == UINT16_MAX) {
while (in_index + 1 < in_size) {
in_index += 1;
sum += in_data[in_index];
if (in_data[in_index] != UINT16_MAX) {
break;
}
}
}
out_data[out_index] = sum;
in_index += 1;
out_index += 1;
}
}
void
integer_unpack_i8(Py_buffer *in_view, Py_buffer *out_view)
{
Py_ssize_t in_size = in_view->shape[0];
Py_ssize_t in_index = 0;
Py_ssize_t out_index = 0;
int8_t *in_data = in_view->buf;
int32_t *out_data = out_view->buf;
while (in_index < in_size) {
int32_t sum = in_data[in_index];
if (sum == INT8_MAX || sum == INT8_MIN) {
while (in_index + 1 < in_size) {
in_index += 1;
sum += in_data[in_index];
if (in_data[in_index] != INT8_MAX && in_data[in_index] != INT8_MIN) {
break;
}
}
}
out_data[out_index] = sum;
in_index += 1;
out_index += 1;
}
}
void
integer_unpack_i16(Py_buffer *in_view, Py_buffer *out_view)
{
Py_ssize_t in_size = in_view->shape[0];
Py_ssize_t in_index = 0;
Py_ssize_t out_index = 0;
int16_t *in_data = in_view->buf;
int32_t *out_data = out_view->buf;
while (in_index < in_size) {
int32_t sum = in_data[in_index];
if (sum == INT16_MAX || sum == INT16_MIN) {
while (in_index + 1 < in_size) {
in_index += 1;
sum += in_data[in_index];
if (in_data[in_index] != INT16_MAX && in_data[in_index] != INT16_MIN) {
break;
}
}
}
out_data[out_index] = sum;
in_index += 1;
out_index += 1;
}
}
static PyObject *
integer_unpack(PyObject *self, PyObject *args)
{
PyObject *in = NULL;
PyObject *out = NULL;
if (!PyArg_ParseTuple(args, "OO", &in, &out)) {
return NULL;
}
Py_buffer in_view, out_view;
const int flags = PyBUF_ND | PyBUF_FORMAT;
if (PyObject_GetBuffer(in, &in_view, flags) != 0) {
return NULL;
}
if (PyObject_GetBuffer(out, &out_view, flags | PyBUF_WRITABLE) != 0) {
PyBuffer_Release(&in_view);
return NULL;
}
if (in_view.ndim != 1) {
PyErr_SetString(PyExc_ValueError, "First argument should be one-dimensional.");
goto exit;
}
if (out_view.ndim != 1) {
PyErr_SetString(PyExc_ValueError, "Second argument should be one-dimensional.");
goto exit;
}
const char format = in_view.format[0];
if (format == 'B') {
integer_unpack_u8(&in_view, &out_view);
}
else if (format == 'H') {
integer_unpack_u16(&in_view, &out_view);
}
else if (format == 'b') {
integer_unpack_i8(&in_view, &out_view);
}
else if (format == 'h') {
integer_unpack_i16(&in_view, &out_view);
}
else {
PyErr_Format(PyExc_ValueError,
"Unexpected buffer format: %s",
in_view.format);
}
exit:
PyBuffer_Release(&in_view);
PyBuffer_Release(&out_view);
Py_INCREF(Py_None);
return Py_None;
}
static PyMethodDef IntegerUnpackMethods[] = {
{"integer_unpack", integer_unpack, METH_VARARGS, NULL},
{NULL, NULL, 0, NULL}
};
static struct PyModuleDef moduledef = {
PyModuleDef_HEAD_INIT,
"_bcif_helper",
NULL,
-1,
IntegerUnpackMethods
};
PyMODINIT_FUNC
PyInit__bcif_helper(void)
{
PyObject *m;
m = PyModule_Create(&moduledef);
if (!m) {
return NULL;
}
return m;
}
|
