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
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/**
* Copyright (c) 2016-present, Gregory Szorc
* All rights reserved.
*
* This software may be modified and distributed under the terms
* of the BSD license. See the LICENSE file for details.
*/
#include "python-zstandard.h"
extern PyObject *ZstdError;
static void ZstdCompressionObj_dealloc(ZstdCompressionObj *self) {
PyMem_Free(self->output.dst);
self->output.dst = NULL;
Py_XDECREF(self->compressor);
PyObject_Del(self);
}
static PyObject *ZstdCompressionObj_compress(ZstdCompressionObj *self,
PyObject *args, PyObject *kwargs) {
static char *kwlist[] = {"data", NULL};
Py_buffer source;
ZSTD_inBuffer input;
size_t zresult;
PyObject *result = NULL;
Py_ssize_t resultSize = 0;
if (self->finished) {
PyErr_SetString(ZstdError,
"cannot call compress() after compressor finished");
return NULL;
}
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:compress", kwlist,
&source)) {
return NULL;
}
input.src = source.buf;
input.size = source.len;
input.pos = 0;
while (input.pos < (size_t)source.len) {
Py_BEGIN_ALLOW_THREADS zresult = ZSTD_compressStream2(
self->compressor->cctx, &self->output, &input, ZSTD_e_continue);
Py_END_ALLOW_THREADS
if (ZSTD_isError(zresult)) {
PyErr_Format(ZstdError, "zstd compress error: %s",
ZSTD_getErrorName(zresult));
Py_CLEAR(result);
goto finally;
}
if (self->output.pos) {
if (result) {
resultSize = PyBytes_GET_SIZE(result);
if (safe_pybytes_resize(&result,
resultSize + self->output.pos)) {
Py_CLEAR(result);
goto finally;
}
memcpy(PyBytes_AS_STRING(result) + resultSize, self->output.dst,
self->output.pos);
}
else {
result = PyBytes_FromStringAndSize(self->output.dst,
self->output.pos);
if (!result) {
goto finally;
}
}
self->output.pos = 0;
}
}
if (NULL == result) {
result = PyBytes_FromString("");
}
finally:
PyBuffer_Release(&source);
return result;
}
static PyObject *ZstdCompressionObj_flush(ZstdCompressionObj *self,
PyObject *args, PyObject *kwargs) {
static char *kwlist[] = {"flush_mode", NULL};
int flushMode = compressorobj_flush_finish;
size_t zresult;
PyObject *result = NULL;
Py_ssize_t resultSize = 0;
ZSTD_inBuffer input;
ZSTD_EndDirective zFlushMode;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i:flush", kwlist,
&flushMode)) {
return NULL;
}
if (flushMode != compressorobj_flush_finish &&
flushMode != compressorobj_flush_block) {
PyErr_SetString(PyExc_ValueError, "flush mode not recognized");
return NULL;
}
if (self->finished) {
PyErr_SetString(ZstdError, "compressor object already finished");
return NULL;
}
switch (flushMode) {
case compressorobj_flush_block:
zFlushMode = ZSTD_e_flush;
break;
case compressorobj_flush_finish:
zFlushMode = ZSTD_e_end;
self->finished = 1;
break;
default:
PyErr_SetString(ZstdError, "unhandled flush mode");
return NULL;
}
assert(self->output.pos == 0);
input.src = NULL;
input.size = 0;
input.pos = 0;
while (1) {
Py_BEGIN_ALLOW_THREADS zresult = ZSTD_compressStream2(
self->compressor->cctx, &self->output, &input, zFlushMode);
Py_END_ALLOW_THREADS
if (ZSTD_isError(zresult)) {
PyErr_Format(ZstdError, "error ending compression stream: %s",
ZSTD_getErrorName(zresult));
return NULL;
}
if (self->output.pos) {
if (result) {
resultSize = PyBytes_GET_SIZE(result);
if (safe_pybytes_resize(&result,
resultSize + self->output.pos)) {
Py_XDECREF(result);
return NULL;
}
memcpy(PyBytes_AS_STRING(result) + resultSize, self->output.dst,
self->output.pos);
}
else {
result = PyBytes_FromStringAndSize(self->output.dst,
self->output.pos);
if (!result) {
return NULL;
}
}
self->output.pos = 0;
}
if (!zresult) {
break;
}
}
if (result) {
return result;
}
else {
return PyBytes_FromString("");
}
}
static PyMethodDef ZstdCompressionObj_methods[] = {
{"compress", (PyCFunction)ZstdCompressionObj_compress,
METH_VARARGS | METH_KEYWORDS, PyDoc_STR("compress data")},
{"flush", (PyCFunction)ZstdCompressionObj_flush,
METH_VARARGS | METH_KEYWORDS, PyDoc_STR("finish compression operation")},
{NULL, NULL}};
PyType_Slot ZstdCompressionObjSlots[] = {
{Py_tp_dealloc, ZstdCompressionObj_dealloc},
{Py_tp_methods, ZstdCompressionObj_methods},
{Py_tp_new, PyType_GenericNew},
{0, NULL},
};
PyType_Spec ZstdCompressionObjSpec = {
"zstd.ZstdCompressionObj",
sizeof(ZstdCompressionObj),
0,
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
ZstdCompressionObjSlots,
};
PyTypeObject *ZstdCompressionObjType;
void compressobj_module_init(PyObject *module) {
ZstdCompressionObjType =
(PyTypeObject *)PyType_FromSpec(&ZstdCompressionObjSpec);
if (PyType_Ready(ZstdCompressionObjType) < 0) {
return;
}
}
|
