bazarr/libs/msgpack/_packer.pyx

375 lines
14 KiB
Cython

# coding: utf-8
from cpython cimport *
from cpython.bytearray cimport PyByteArray_Check, PyByteArray_CheckExact
from cpython.datetime cimport (
PyDateTime_CheckExact, PyDelta_CheckExact,
datetime_tzinfo, timedelta_days, timedelta_seconds, timedelta_microseconds,
)
cdef ExtType
cdef Timestamp
from .ext import ExtType, Timestamp
cdef extern from "Python.h":
int PyMemoryView_Check(object obj)
char* PyUnicode_AsUTF8AndSize(object obj, Py_ssize_t *l) except NULL
cdef extern from "pack.h":
struct msgpack_packer:
char* buf
size_t length
size_t buf_size
bint use_bin_type
int msgpack_pack_int(msgpack_packer* pk, int d)
int msgpack_pack_nil(msgpack_packer* pk)
int msgpack_pack_true(msgpack_packer* pk)
int msgpack_pack_false(msgpack_packer* pk)
int msgpack_pack_long(msgpack_packer* pk, long d)
int msgpack_pack_long_long(msgpack_packer* pk, long long d)
int msgpack_pack_unsigned_long_long(msgpack_packer* pk, unsigned long long d)
int msgpack_pack_float(msgpack_packer* pk, float d)
int msgpack_pack_double(msgpack_packer* pk, double d)
int msgpack_pack_array(msgpack_packer* pk, size_t l)
int msgpack_pack_map(msgpack_packer* pk, size_t l)
int msgpack_pack_raw(msgpack_packer* pk, size_t l)
int msgpack_pack_bin(msgpack_packer* pk, size_t l)
int msgpack_pack_raw_body(msgpack_packer* pk, char* body, size_t l)
int msgpack_pack_ext(msgpack_packer* pk, char typecode, size_t l)
int msgpack_pack_timestamp(msgpack_packer* x, long long seconds, unsigned long nanoseconds);
int msgpack_pack_unicode(msgpack_packer* pk, object o, long long limit)
cdef extern from "buff_converter.h":
object buff_to_buff(char *, Py_ssize_t)
cdef int DEFAULT_RECURSE_LIMIT=511
cdef long long ITEM_LIMIT = (2**32)-1
cdef inline int PyBytesLike_Check(object o):
return PyBytes_Check(o) or PyByteArray_Check(o)
cdef inline int PyBytesLike_CheckExact(object o):
return PyBytes_CheckExact(o) or PyByteArray_CheckExact(o)
cdef class Packer(object):
"""
MessagePack Packer
Usage::
packer = Packer()
astream.write(packer.pack(a))
astream.write(packer.pack(b))
Packer's constructor has some keyword arguments:
:param callable default:
Convert user type to builtin type that Packer supports.
See also simplejson's document.
:param bool use_single_float:
Use single precision float type for float. (default: False)
:param bool autoreset:
Reset buffer after each pack and return its content as `bytes`. (default: True).
If set this to false, use `bytes()` to get content and `.reset()` to clear buffer.
:param bool use_bin_type:
Use bin type introduced in msgpack spec 2.0 for bytes.
It also enables str8 type for unicode. (default: True)
:param bool strict_types:
If set to true, types will be checked to be exact. Derived classes
from serializeable types will not be serialized and will be
treated as unsupported type and forwarded to default.
Additionally tuples will not be serialized as lists.
This is useful when trying to implement accurate serialization
for python types.
:param bool datetime:
If set to true, datetime with tzinfo is packed into Timestamp type.
Note that the tzinfo is stripped in the timestamp.
You can get UTC datetime with `timestamp=3` option of the Unpacker.
(Python 2 is not supported).
:param str unicode_errors:
The error handler for encoding unicode. (default: 'strict')
DO NOT USE THIS!! This option is kept for very specific usage.
"""
cdef msgpack_packer pk
cdef object _default
cdef object _berrors
cdef const char *unicode_errors
cdef bint strict_types
cdef bint use_float
cdef bint autoreset
cdef bint datetime
def __cinit__(self):
cdef int buf_size = 1024*1024
self.pk.buf = <char*> PyMem_Malloc(buf_size)
if self.pk.buf == NULL:
raise MemoryError("Unable to allocate internal buffer.")
self.pk.buf_size = buf_size
self.pk.length = 0
def __init__(self, *, default=None,
bint use_single_float=False, bint autoreset=True, bint use_bin_type=True,
bint strict_types=False, bint datetime=False, unicode_errors=None):
self.use_float = use_single_float
self.strict_types = strict_types
self.autoreset = autoreset
self.datetime = datetime
self.pk.use_bin_type = use_bin_type
if default is not None:
if not PyCallable_Check(default):
raise TypeError("default must be a callable.")
self._default = default
self._berrors = unicode_errors
if unicode_errors is None:
self.unicode_errors = NULL
else:
self.unicode_errors = self._berrors
def __dealloc__(self):
PyMem_Free(self.pk.buf)
self.pk.buf = NULL
cdef int _pack(self, object o, int nest_limit=DEFAULT_RECURSE_LIMIT) except -1:
cdef long long llval
cdef unsigned long long ullval
cdef unsigned long ulval
cdef long longval
cdef float fval
cdef double dval
cdef char* rawval
cdef int ret
cdef dict d
cdef Py_ssize_t L
cdef int default_used = 0
cdef bint strict_types = self.strict_types
cdef Py_buffer view
if nest_limit < 0:
raise ValueError("recursion limit exceeded.")
while True:
if o is None:
ret = msgpack_pack_nil(&self.pk)
elif o is True:
ret = msgpack_pack_true(&self.pk)
elif o is False:
ret = msgpack_pack_false(&self.pk)
elif PyLong_CheckExact(o) if strict_types else PyLong_Check(o):
# PyInt_Check(long) is True for Python 3.
# So we should test long before int.
try:
if o > 0:
ullval = o
ret = msgpack_pack_unsigned_long_long(&self.pk, ullval)
else:
llval = o
ret = msgpack_pack_long_long(&self.pk, llval)
except OverflowError as oe:
if not default_used and self._default is not None:
o = self._default(o)
default_used = True
continue
else:
raise OverflowError("Integer value out of range")
elif PyInt_CheckExact(o) if strict_types else PyInt_Check(o):
longval = o
ret = msgpack_pack_long(&self.pk, longval)
elif PyFloat_CheckExact(o) if strict_types else PyFloat_Check(o):
if self.use_float:
fval = o
ret = msgpack_pack_float(&self.pk, fval)
else:
dval = o
ret = msgpack_pack_double(&self.pk, dval)
elif PyBytesLike_CheckExact(o) if strict_types else PyBytesLike_Check(o):
L = Py_SIZE(o)
if L > ITEM_LIMIT:
PyErr_Format(ValueError, b"%.200s object is too large", Py_TYPE(o).tp_name)
rawval = o
ret = msgpack_pack_bin(&self.pk, L)
if ret == 0:
ret = msgpack_pack_raw_body(&self.pk, rawval, L)
elif PyUnicode_CheckExact(o) if strict_types else PyUnicode_Check(o):
if self.unicode_errors == NULL:
ret = msgpack_pack_unicode(&self.pk, o, ITEM_LIMIT);
if ret == -2:
raise ValueError("unicode string is too large")
else:
o = PyUnicode_AsEncodedString(o, NULL, self.unicode_errors)
L = Py_SIZE(o)
if L > ITEM_LIMIT:
raise ValueError("unicode string is too large")
ret = msgpack_pack_raw(&self.pk, L)
if ret == 0:
rawval = o
ret = msgpack_pack_raw_body(&self.pk, rawval, L)
elif PyDict_CheckExact(o):
d = <dict>o
L = len(d)
if L > ITEM_LIMIT:
raise ValueError("dict is too large")
ret = msgpack_pack_map(&self.pk, L)
if ret == 0:
for k, v in d.items():
ret = self._pack(k, nest_limit-1)
if ret != 0: break
ret = self._pack(v, nest_limit-1)
if ret != 0: break
elif not strict_types and PyDict_Check(o):
L = len(o)
if L > ITEM_LIMIT:
raise ValueError("dict is too large")
ret = msgpack_pack_map(&self.pk, L)
if ret == 0:
for k, v in o.items():
ret = self._pack(k, nest_limit-1)
if ret != 0: break
ret = self._pack(v, nest_limit-1)
if ret != 0: break
elif type(o) is ExtType if strict_types else isinstance(o, ExtType):
# This should be before Tuple because ExtType is namedtuple.
longval = o.code
rawval = o.data
L = len(o.data)
if L > ITEM_LIMIT:
raise ValueError("EXT data is too large")
ret = msgpack_pack_ext(&self.pk, longval, L)
ret = msgpack_pack_raw_body(&self.pk, rawval, L)
elif type(o) is Timestamp:
llval = o.seconds
ulval = o.nanoseconds
ret = msgpack_pack_timestamp(&self.pk, llval, ulval)
elif PyList_CheckExact(o) if strict_types else (PyTuple_Check(o) or PyList_Check(o)):
L = Py_SIZE(o)
if L > ITEM_LIMIT:
raise ValueError("list is too large")
ret = msgpack_pack_array(&self.pk, L)
if ret == 0:
for v in o:
ret = self._pack(v, nest_limit-1)
if ret != 0: break
elif PyMemoryView_Check(o):
if PyObject_GetBuffer(o, &view, PyBUF_SIMPLE) != 0:
raise ValueError("could not get buffer for memoryview")
L = view.len
if L > ITEM_LIMIT:
PyBuffer_Release(&view);
raise ValueError("memoryview is too large")
ret = msgpack_pack_bin(&self.pk, L)
if ret == 0:
ret = msgpack_pack_raw_body(&self.pk, <char*>view.buf, L)
PyBuffer_Release(&view);
elif self.datetime and PyDateTime_CheckExact(o) and datetime_tzinfo(o) is not None:
delta = o - epoch
if not PyDelta_CheckExact(delta):
raise ValueError("failed to calculate delta")
llval = timedelta_days(delta) * <long long>(24*60*60) + timedelta_seconds(delta)
ulval = timedelta_microseconds(delta) * 1000
ret = msgpack_pack_timestamp(&self.pk, llval, ulval)
elif not default_used and self._default:
o = self._default(o)
default_used = 1
continue
elif self.datetime and PyDateTime_CheckExact(o):
PyErr_Format(ValueError, b"can not serialize '%.200s' object where tzinfo=None", Py_TYPE(o).tp_name)
else:
PyErr_Format(TypeError, b"can not serialize '%.200s' object", Py_TYPE(o).tp_name)
return ret
cpdef pack(self, object obj):
cdef int ret
try:
ret = self._pack(obj, DEFAULT_RECURSE_LIMIT)
except:
self.pk.length = 0
raise
if ret: # should not happen.
raise RuntimeError("internal error")
if self.autoreset:
buf = PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
self.pk.length = 0
return buf
def pack_ext_type(self, typecode, data):
msgpack_pack_ext(&self.pk, typecode, len(data))
msgpack_pack_raw_body(&self.pk, data, len(data))
def pack_array_header(self, long long size):
if size > ITEM_LIMIT:
raise ValueError
cdef int ret = msgpack_pack_array(&self.pk, size)
if ret == -1:
raise MemoryError
elif ret: # should not happen
raise TypeError
if self.autoreset:
buf = PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
self.pk.length = 0
return buf
def pack_map_header(self, long long size):
if size > ITEM_LIMIT:
raise ValueError
cdef int ret = msgpack_pack_map(&self.pk, size)
if ret == -1:
raise MemoryError
elif ret: # should not happen
raise TypeError
if self.autoreset:
buf = PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
self.pk.length = 0
return buf
def pack_map_pairs(self, object pairs):
"""
Pack *pairs* as msgpack map type.
*pairs* should be a sequence of pairs.
(`len(pairs)` and `for k, v in pairs:` should be supported.)
"""
cdef int ret = msgpack_pack_map(&self.pk, len(pairs))
if ret == 0:
for k, v in pairs:
ret = self._pack(k)
if ret != 0: break
ret = self._pack(v)
if ret != 0: break
if ret == -1:
raise MemoryError
elif ret: # should not happen
raise TypeError
if self.autoreset:
buf = PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
self.pk.length = 0
return buf
def reset(self):
"""Reset internal buffer.
This method is useful only when autoreset=False.
"""
self.pk.length = 0
def bytes(self):
"""Return internal buffer contents as bytes object"""
return PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
def getbuffer(self):
"""Return view of internal buffer."""
return buff_to_buff(self.pk.buf, self.pk.length)