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import sys

import struct

import array

import pytz

WORD_SIZE = struct.calcsize('L')

if sys.maxsize == 2**63-1:

ADDR_SIZE = 8

ADDR_CHAR = 'q'

else:

ADDR_SIZE = 4

ADDR_CHAR = 'l'

PY3 = sys.version_info[0] >= 3

def read_word(fileobj):

"""Read a single long from `fileobj`."""

b = fileobj.read(WORD_SIZE)

#do not use UNPACK_CHAR here

r = int(struct.unpack('l', b)[0])

return r

def read_addr(fileobj):

return struct.unpack(ADDR_CHAR, fileobj.read(ADDR_SIZE))[0]

def read_addresses(fileobj, count):

"""Read `addresses` longs from `fileobj`."""

if PY3:

r = array.array(ADDR_CHAR)

b = fileobj.read(ADDR_SIZE * count)

r.frombytes(b)

else:

r = [struct.unpack(ADDR_CHAR, fileobj.read(ADDR_SIZE))[0] \

for i in range(count)]

return r

def read_byte(fileobj):

value = fileobj.read(1)

if PY3:

return value[0]

return ord(value[0])

def read_char(fileobj):

value = fileobj.read(1)

if PY3:

return chr(value[0])

return value[0]

def read_bytes(fileobj):

lgt = int(struct.unpack('<i', fileobj.read(4))[0])

return fileobj.read(lgt)

def read_string(fileobj, little_endian=False):

if little_endian:

lgt = int(struct.unpack('<i', fileobj.read(4))[0])

data = fileobj.read(lgt)

if PY3:

data = data.decode('utf-8')

return data

else:

lgt = int(struct.unpack('l', fileobj.read(WORD_SIZE))[0])

return fileobj.read(lgt)

def read_le_u16(fileobj):

return int(struct.unpack('<H', fileobj.read(2))[0])

def read_le_u64(fileobj):

return int(struct.unpack('<Q', fileobj.read(8))[0])

def read_s64(fileobj):

return int(struct.unpack('q', fileobj.read(8))[0])

def read_le_s64(fileobj):

return int(struct.unpack('<q', fileobj.read(8))[0])

def read_timeval(fileobj):

tv_sec = read_s64(fileobj)

tv_usec = read_s64(fileobj)

return tv_sec * 10**6 + tv_usec

def read_timezone(fileobj):

timezone = fileobj.read(8).strip(b'\x00')

timezone = timezone.decode('ascii')

if timezone:

return pytz.timezone(timezone)

return None

def encode_le_u16(value):

return struct.pack('<H', value)

def encode_le_s32(value):

return struct.pack('<i', value)

def encode_le_u32(value):

return struct.pack('<I', value)

def encode_le_s64(value):

return struct.pack('<q', value)

def encode_le_u64(value):

return struct.pack('<Q', value)

def encode_str(val):

if PY3:

val = val.encode()

return struct.pack("<i", len(val)) + val

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