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# coding: utf-8
#cython: embedsignature=True
from cpython cimport *
cdef extern from "Python.h":
ctypedef char* const_char_ptr "const char*"
ctypedef char* const_void_ptr "const void*"
ctypedef struct PyObject
cdef int PyObject_AsReadBuffer(object o, const_void_ptr* buff, Py_ssize_t* buf_len) except -1
from libc.stdlib cimport *
from libc.string cimport *
from libc.limits cimport *
from msgpack.exceptions import PackValueError
cdef extern from "pack.h":
struct msgpack_packer:
char* buf
size_t length
size_t buf_size
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_raw_body(msgpack_packer* pk, char* body, size_t l)
cdef int DEFAULT_RECURSE_LIMIT=511
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:
* *defaut* - Convert user type to builtin type that Packer supports.
See also simplejson's document.
* *encoding* - Convert unicode to bytes with this encoding. (default: 'utf-8')
* *unicode_erros* - Error handler for encoding unicode. (default: 'strict')
* *use_single_float* - Use single precision float type for float. (default: False)
* *autoreset* - Reset buffer after each pack and return it's content as `bytes`. (default: True).
If set this to false, use `bytes()` to get content and `.reset()` to clear buffer.
"""
cdef msgpack_packer pk
cdef object _default
cdef object _bencoding
cdef object _berrors
cdef char *encoding
cdef char *unicode_errors
cdef bool use_float
cdef bint autoreset
def __cinit__(self):
cdef int buf_size = 1024*1024
self.pk.buf = <char*> 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, encoding='utf-8', unicode_errors='strict', use_single_float=False, bint autoreset=1):
self.use_float = use_single_float
self.autoreset = autoreset
if default is not None:
if not PyCallable_Check(default):
raise TypeError("default must be a callable.")
self._default = default
if encoding is None:
self.encoding = NULL
self.unicode_errors = NULL
else:
if isinstance(encoding, unicode):
self._bencoding = encoding.encode('ascii')
else:
self._bencoding = encoding
self.encoding = PyBytes_AsString(self._bencoding)
if isinstance(unicode_errors, unicode):
self._berrors = unicode_errors.encode('ascii')
else:
self._berrors = unicode_errors
self.unicode_errors = PyBytes_AsString(self._berrors)
def __dealloc__(self):
free(self.pk.buf);
cdef int _pack(self, object o, int nest_limit=DEFAULT_RECURSE_LIMIT) except -1:
cdef long long llval
cdef unsigned long long ullval
cdef long longval
cdef float fval
cdef double dval
cdef char* rawval
cdef int ret
cdef dict d
if nest_limit < 0:
raise PackValueError("recursion limit exceeded.")
if o is None:
ret = msgpack_pack_nil(&self.pk)
elif isinstance(o, bool):
if o:
ret = msgpack_pack_true(&self.pk)
else:
ret = msgpack_pack_false(&self.pk)
elif PyLong_Check(o):
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)
elif PyInt_Check(o):
longval = o
ret = msgpack_pack_long(&self.pk, longval)
elif 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 PyBytes_Check(o):
rawval = o
ret = msgpack_pack_raw(&self.pk, len(o))
if ret == 0:
ret = msgpack_pack_raw_body(&self.pk, rawval, len(o))
elif PyUnicode_Check(o):
if not self.encoding:
raise TypeError("Can't encode unicode string: no encoding is specified")
o = PyUnicode_AsEncodedString(o, self.encoding, self.unicode_errors)
rawval = o
ret = msgpack_pack_raw(&self.pk, len(o))
if ret == 0:
ret = msgpack_pack_raw_body(&self.pk, rawval, len(o))
elif PyDict_CheckExact(o):
d = <dict>o
ret = msgpack_pack_map(&self.pk, len(d))
if ret == 0:
for k, v in d.iteritems():
ret = self._pack(k, nest_limit-1)
if ret != 0: break
ret = self._pack(v, nest_limit-1)
if ret != 0: break
elif PyDict_Check(o):
ret = msgpack_pack_map(&self.pk, len(o))
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 PyTuple_Check(o) or PyList_Check(o):
ret = msgpack_pack_array(&self.pk, len(o))
if ret == 0:
for v in o:
ret = self._pack(v, nest_limit-1)
if ret != 0: break
elif self._default:
o = self._default(o)
ret = self._pack(o, nest_limit-1)
else:
raise TypeError("can't serialize %r" % (o,))
return ret
cpdef pack(self, object obj):
cdef int ret
ret = self._pack(obj, DEFAULT_RECURSE_LIMIT)
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_array_header(self, size_t size):
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, size_t size):
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 sequence of pair.
(`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):
"""Clear internal buffer."""
self.pk.length = 0
def bytes(self):
"""Return buffer content."""
return PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
def pack(object o, object stream, default=None, encoding='utf-8', unicode_errors='strict'):
"""
pack an object `o` and write it to stream)."""
packer = Packer(default=default, encoding=encoding, unicode_errors=unicode_errors)
stream.write(packer.pack(o))
def packb(object o, default=None, encoding='utf-8', unicode_errors='strict', use_single_float=False):
"""
pack o and return packed bytes."""
packer = Packer(default=default, encoding=encoding, unicode_errors=unicode_errors,
use_single_float=use_single_float)
return packer.pack(o)
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