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# Copyright 2015 Facebook, Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# * Neither the name Facebook nor the names of its contributors may be used to
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# endorse or promote products derived from this software without specific
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# prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# no unicode literals
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from __future__ import absolute_import, division, print_function
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import binascii
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import collections
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import ctypes
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import struct
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import sys
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from . import compat
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BSER_ARRAY = b"\x00"
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BSER_OBJECT = b"\x01"
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BSER_BYTESTRING = b"\x02"
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BSER_INT8 = b"\x03"
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BSER_INT16 = b"\x04"
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BSER_INT32 = b"\x05"
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BSER_INT64 = b"\x06"
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BSER_REAL = b"\x07"
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BSER_TRUE = b"\x08"
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BSER_FALSE = b"\x09"
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BSER_NULL = b"\x0a"
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BSER_TEMPLATE = b"\x0b"
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BSER_SKIP = b"\x0c"
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BSER_UTF8STRING = b"\x0d"
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if compat.PYTHON3:
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STRING_TYPES = (str, bytes)
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unicode = str
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def tobytes(i):
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return str(i).encode("ascii")
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long = int
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else:
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STRING_TYPES = (unicode, str)
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tobytes = bytes
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# Leave room for the serialization header, which includes
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# our overall length. To make things simpler, we'll use an
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# int32 for the header
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EMPTY_HEADER = b"\x00\x01\x05\x00\x00\x00\x00"
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EMPTY_HEADER_V2 = b"\x00\x02\x00\x00\x00\x00\x05\x00\x00\x00\x00"
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def _int_size(x):
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"""Return the smallest size int that can store the value"""
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if -0x80 <= x <= 0x7F:
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return 1
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elif -0x8000 <= x <= 0x7FFF:
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return 2
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elif -0x80000000 <= x <= 0x7FFFFFFF:
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return 4
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elif long(-0x8000000000000000) <= x <= long(0x7FFFFFFFFFFFFFFF):
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return 8
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else:
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raise RuntimeError("Cannot represent value: " + str(x))
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def _buf_pos(buf, pos):
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ret = buf[pos]
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# Normalize the return type to bytes
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if compat.PYTHON3 and not isinstance(ret, bytes):
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ret = bytes((ret,))
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return ret
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class _bser_buffer(object):
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def __init__(self, version):
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self.bser_version = version
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self.buf = ctypes.create_string_buffer(8192)
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if self.bser_version == 1:
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struct.pack_into(
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tobytes(len(EMPTY_HEADER)) + b"s", self.buf, 0, EMPTY_HEADER
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)
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self.wpos = len(EMPTY_HEADER)
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else:
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assert self.bser_version == 2
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struct.pack_into(
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tobytes(len(EMPTY_HEADER_V2)) + b"s",
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self.buf,
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0,
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EMPTY_HEADER_V2,
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)
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self.wpos = len(EMPTY_HEADER_V2)
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def ensure_size(self, size):
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while ctypes.sizeof(self.buf) - self.wpos < size:
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ctypes.resize(self.buf, ctypes.sizeof(self.buf) * 2)
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def append_long(self, val):
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size = _int_size(val)
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to_write = size + 1
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self.ensure_size(to_write)
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if size == 1:
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struct.pack_into(b"=cb", self.buf, self.wpos, BSER_INT8, val)
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elif size == 2:
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struct.pack_into(b"=ch", self.buf, self.wpos, BSER_INT16, val)
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elif size == 4:
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struct.pack_into(b"=ci", self.buf, self.wpos, BSER_INT32, val)
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elif size == 8:
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struct.pack_into(b"=cq", self.buf, self.wpos, BSER_INT64, val)
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else:
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raise RuntimeError("Cannot represent this long value")
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self.wpos += to_write
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def append_string(self, s):
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if isinstance(s, unicode):
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s = s.encode("utf-8")
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s_len = len(s)
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size = _int_size(s_len)
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to_write = 2 + size + s_len
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self.ensure_size(to_write)
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if size == 1:
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struct.pack_into(
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b"=ccb" + tobytes(s_len) + b"s",
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self.buf,
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self.wpos,
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BSER_BYTESTRING,
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BSER_INT8,
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s_len,
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s,
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)
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elif size == 2:
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struct.pack_into(
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b"=cch" + tobytes(s_len) + b"s",
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self.buf,
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self.wpos,
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BSER_BYTESTRING,
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BSER_INT16,
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s_len,
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s,
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)
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elif size == 4:
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struct.pack_into(
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b"=cci" + tobytes(s_len) + b"s",
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self.buf,
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self.wpos,
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BSER_BYTESTRING,
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BSER_INT32,
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s_len,
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s,
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)
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elif size == 8:
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struct.pack_into(
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b"=ccq" + tobytes(s_len) + b"s",
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self.buf,
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self.wpos,
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BSER_BYTESTRING,
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BSER_INT64,
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s_len,
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s,
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)
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else:
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raise RuntimeError("Cannot represent this string value")
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self.wpos += to_write
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def append_recursive(self, val):
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if isinstance(val, bool):
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needed = 1
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self.ensure_size(needed)
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if val:
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to_encode = BSER_TRUE
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else:
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to_encode = BSER_FALSE
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struct.pack_into(b"=c", self.buf, self.wpos, to_encode)
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self.wpos += needed
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elif val is None:
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needed = 1
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self.ensure_size(needed)
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struct.pack_into(b"=c", self.buf, self.wpos, BSER_NULL)
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self.wpos += needed
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elif isinstance(val, (int, long)):
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self.append_long(val)
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elif isinstance(val, STRING_TYPES):
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self.append_string(val)
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elif isinstance(val, float):
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needed = 9
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self.ensure_size(needed)
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struct.pack_into(b"=cd", self.buf, self.wpos, BSER_REAL, val)
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self.wpos += needed
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elif isinstance(val, collections.Mapping) and isinstance(
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val, collections.Sized
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):
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val_len = len(val)
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size = _int_size(val_len)
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needed = 2 + size
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self.ensure_size(needed)
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if size == 1:
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struct.pack_into(
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b"=ccb",
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self.buf,
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self.wpos,
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BSER_OBJECT,
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BSER_INT8,
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val_len,
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)
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elif size == 2:
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struct.pack_into(
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b"=cch",
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self.buf,
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self.wpos,
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BSER_OBJECT,
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BSER_INT16,
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val_len,
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)
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elif size == 4:
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struct.pack_into(
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b"=cci",
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self.buf,
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self.wpos,
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BSER_OBJECT,
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BSER_INT32,
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val_len,
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)
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elif size == 8:
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struct.pack_into(
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b"=ccq",
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self.buf,
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self.wpos,
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BSER_OBJECT,
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BSER_INT64,
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val_len,
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)
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else:
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raise RuntimeError("Cannot represent this mapping value")
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self.wpos += needed
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if compat.PYTHON3:
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iteritems = val.items()
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else:
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iteritems = val.iteritems() # noqa: B301 Checked version above
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for k, v in iteritems:
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self.append_string(k)
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self.append_recursive(v)
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elif isinstance(val, collections.Iterable) and isinstance(
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val, collections.Sized
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):
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val_len = len(val)
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size = _int_size(val_len)
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needed = 2 + size
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self.ensure_size(needed)
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if size == 1:
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struct.pack_into(
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b"=ccb", self.buf, self.wpos, BSER_ARRAY, BSER_INT8, val_len
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)
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elif size == 2:
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struct.pack_into(
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b"=cch",
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self.buf,
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self.wpos,
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BSER_ARRAY,
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BSER_INT16,
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val_len,
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)
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elif size == 4:
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struct.pack_into(
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b"=cci",
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self.buf,
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self.wpos,
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BSER_ARRAY,
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BSER_INT32,
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val_len,
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)
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elif size == 8:
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struct.pack_into(
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b"=ccq",
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self.buf,
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self.wpos,
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BSER_ARRAY,
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BSER_INT64,
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val_len,
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)
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else:
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raise RuntimeError("Cannot represent this sequence value")
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self.wpos += needed
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for v in val:
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self.append_recursive(v)
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else:
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raise RuntimeError("Cannot represent unknown value type")
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def dumps(obj, version=1, capabilities=0):
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bser_buf = _bser_buffer(version=version)
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bser_buf.append_recursive(obj)
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# Now fill in the overall length
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if version == 1:
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obj_len = bser_buf.wpos - len(EMPTY_HEADER)
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struct.pack_into(b"=i", bser_buf.buf, 3, obj_len)
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else:
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obj_len = bser_buf.wpos - len(EMPTY_HEADER_V2)
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struct.pack_into(b"=i", bser_buf.buf, 2, capabilities)
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struct.pack_into(b"=i", bser_buf.buf, 7, obj_len)
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return bser_buf.buf.raw[: bser_buf.wpos]
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# This is a quack-alike with the bserObjectType in bser.c
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# It provides by getattr accessors and getitem for both index
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# and name.
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class _BunserDict(object):
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__slots__ = ("_keys", "_values")
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def __init__(self, keys, values):
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self._keys = keys
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self._values = values
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def __getattr__(self, name):
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return self.__getitem__(name)
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def __getitem__(self, key):
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if isinstance(key, (int, long)):
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return self._values[key]
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elif key.startswith("st_"):
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# hack^Wfeature to allow mercurial to use "st_size" to
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# reference "size"
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key = key[3:]
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try:
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return self._values[self._keys.index(key)]
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except ValueError:
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raise KeyError("_BunserDict has no key %s" % key)
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def __len__(self):
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return len(self._keys)
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class Bunser(object):
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def __init__(self, mutable=True, value_encoding=None, value_errors=None):
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self.mutable = mutable
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self.value_encoding = value_encoding
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if value_encoding is None:
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self.value_errors = None
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elif value_errors is None:
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self.value_errors = "strict"
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else:
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self.value_errors = value_errors
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@staticmethod
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def unser_int(buf, pos):
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try:
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int_type = _buf_pos(buf, pos)
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except IndexError:
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raise ValueError("Invalid bser int encoding, pos out of range")
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if int_type == BSER_INT8:
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needed = 2
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fmt = b"=b"
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elif int_type == BSER_INT16:
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needed = 3
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fmt = b"=h"
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elif int_type == BSER_INT32:
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needed = 5
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fmt = b"=i"
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elif int_type == BSER_INT64:
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needed = 9
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fmt = b"=q"
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else:
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raise ValueError(
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"Invalid bser int encoding 0x%s at position %s"
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% (binascii.hexlify(int_type).decode("ascii"), pos)
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)
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int_val = struct.unpack_from(fmt, buf, pos + 1)[0]
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return (int_val, pos + needed)
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def unser_utf8_string(self, buf, pos):
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str_len, pos = self.unser_int(buf, pos + 1)
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str_val = struct.unpack_from(tobytes(str_len) + b"s", buf, pos)[0]
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return (str_val.decode("utf-8"), pos + str_len)
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def unser_bytestring(self, buf, pos):
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str_len, pos = self.unser_int(buf, pos + 1)
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str_val = struct.unpack_from(tobytes(str_len) + b"s", buf, pos)[0]
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if self.value_encoding is not None:
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str_val = str_val.decode(self.value_encoding, self.value_errors)
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# str_len stays the same because that's the length in bytes
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return (str_val, pos + str_len)
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def unser_array(self, buf, pos):
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arr_len, pos = self.unser_int(buf, pos + 1)
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arr = []
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for _ in range(arr_len):
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arr_item, pos = self.loads_recursive(buf, pos)
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arr.append(arr_item)
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if not self.mutable:
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arr = tuple(arr)
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return arr, pos
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def unser_object(self, buf, pos):
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obj_len, pos = self.unser_int(buf, pos + 1)
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if self.mutable:
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obj = {}
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else:
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keys = []
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vals = []
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for _ in range(obj_len):
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key, pos = self.unser_utf8_string(buf, pos)
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val, pos = self.loads_recursive(buf, pos)
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if self.mutable:
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obj[key] = val
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else:
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keys.append(key)
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vals.append(val)
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if not self.mutable:
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obj = _BunserDict(keys, vals)
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return obj, pos
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def unser_template(self, buf, pos):
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|
|
val_type = _buf_pos(buf, pos + 1)
|
|
|
if val_type != BSER_ARRAY:
|
|
|
raise RuntimeError("Expect ARRAY to follow TEMPLATE")
|
|
|
# force UTF-8 on keys
|
|
|
keys_bunser = Bunser(mutable=self.mutable, value_encoding="utf-8")
|
|
|
keys, pos = keys_bunser.unser_array(buf, pos + 1)
|
|
|
nitems, pos = self.unser_int(buf, pos)
|
|
|
arr = []
|
|
|
for _ in range(nitems):
|
|
|
if self.mutable:
|
|
|
obj = {}
|
|
|
else:
|
|
|
vals = []
|
|
|
|
|
|
for keyidx in range(len(keys)):
|
|
|
if _buf_pos(buf, pos) == BSER_SKIP:
|
|
|
pos += 1
|
|
|
ele = None
|
|
|
else:
|
|
|
ele, pos = self.loads_recursive(buf, pos)
|
|
|
|
|
|
if self.mutable:
|
|
|
key = keys[keyidx]
|
|
|
obj[key] = ele
|
|
|
else:
|
|
|
vals.append(ele)
|
|
|
|
|
|
if not self.mutable:
|
|
|
obj = _BunserDict(keys, vals)
|
|
|
|
|
|
arr.append(obj)
|
|
|
return arr, pos
|
|
|
|
|
|
def loads_recursive(self, buf, pos):
|
|
|
val_type = _buf_pos(buf, pos)
|
|
|
if (
|
|
|
val_type == BSER_INT8
|
|
|
or val_type == BSER_INT16
|
|
|
or val_type == BSER_INT32
|
|
|
or val_type == BSER_INT64
|
|
|
):
|
|
|
return self.unser_int(buf, pos)
|
|
|
elif val_type == BSER_REAL:
|
|
|
val = struct.unpack_from(b"=d", buf, pos + 1)[0]
|
|
|
return (val, pos + 9)
|
|
|
elif val_type == BSER_TRUE:
|
|
|
return (True, pos + 1)
|
|
|
elif val_type == BSER_FALSE:
|
|
|
return (False, pos + 1)
|
|
|
elif val_type == BSER_NULL:
|
|
|
return (None, pos + 1)
|
|
|
elif val_type == BSER_BYTESTRING:
|
|
|
return self.unser_bytestring(buf, pos)
|
|
|
elif val_type == BSER_UTF8STRING:
|
|
|
return self.unser_utf8_string(buf, pos)
|
|
|
elif val_type == BSER_ARRAY:
|
|
|
return self.unser_array(buf, pos)
|
|
|
elif val_type == BSER_OBJECT:
|
|
|
return self.unser_object(buf, pos)
|
|
|
elif val_type == BSER_TEMPLATE:
|
|
|
return self.unser_template(buf, pos)
|
|
|
else:
|
|
|
raise ValueError(
|
|
|
"unhandled bser opcode 0x%s"
|
|
|
% binascii.hexlify(val_type).decode("ascii")
|
|
|
)
|
|
|
|
|
|
|
|
|
def _pdu_info_helper(buf):
|
|
|
if buf[0:2] == EMPTY_HEADER[0:2]:
|
|
|
bser_version = 1
|
|
|
bser_capabilities = 0
|
|
|
expected_len, pos2 = Bunser.unser_int(buf, 2)
|
|
|
elif buf[0:2] == EMPTY_HEADER_V2[0:2]:
|
|
|
if len(buf) < 8:
|
|
|
raise ValueError("Invalid BSER header")
|
|
|
bser_version = 2
|
|
|
bser_capabilities = struct.unpack_from("I", buf, 2)[0]
|
|
|
expected_len, pos2 = Bunser.unser_int(buf, 6)
|
|
|
else:
|
|
|
raise ValueError("Invalid BSER header")
|
|
|
|
|
|
return bser_version, bser_capabilities, expected_len, pos2
|
|
|
|
|
|
|
|
|
def pdu_info(buf):
|
|
|
info = _pdu_info_helper(buf)
|
|
|
return info[0], info[1], info[2] + info[3]
|
|
|
|
|
|
|
|
|
def pdu_len(buf):
|
|
|
info = _pdu_info_helper(buf)
|
|
|
return info[2] + info[3]
|
|
|
|
|
|
|
|
|
def loads(buf, mutable=True, value_encoding=None, value_errors=None):
|
|
|
"""Deserialize a BSER-encoded blob.
|
|
|
|
|
|
@param buf: The buffer to deserialize.
|
|
|
@type buf: bytes
|
|
|
|
|
|
@param mutable: Whether to return mutable results.
|
|
|
@type mutable: bool
|
|
|
|
|
|
@param value_encoding: Optional codec to use to decode values. If
|
|
|
unspecified or None, return values as bytestrings.
|
|
|
@type value_encoding: str
|
|
|
|
|
|
@param value_errors: Optional error handler for codec. 'strict' by default.
|
|
|
The other most common argument is 'surrogateescape' on
|
|
|
Python 3. If value_encoding is None, this is ignored.
|
|
|
@type value_errors: str
|
|
|
"""
|
|
|
|
|
|
info = _pdu_info_helper(buf)
|
|
|
expected_len = info[2]
|
|
|
pos = info[3]
|
|
|
|
|
|
if len(buf) != expected_len + pos:
|
|
|
raise ValueError(
|
|
|
"bser data len %d != header len %d" % (expected_len + pos, len(buf))
|
|
|
)
|
|
|
|
|
|
bunser = Bunser(
|
|
|
mutable=mutable,
|
|
|
value_encoding=value_encoding,
|
|
|
value_errors=value_errors,
|
|
|
)
|
|
|
|
|
|
return bunser.loads_recursive(buf, pos)[0]
|
|
|
|
|
|
|
|
|
def load(fp, mutable=True, value_encoding=None, value_errors=None):
|
|
|
from . import load
|
|
|
|
|
|
return load.load(fp, mutable, value_encoding, value_errors)
|
|
|
|
