def unpack_farray_int(self, n):
if not self.unpackIntDict.has_key(n):
fmt = ">" + "l" * n
self.unpackIntDict[n] = Struct(fmt).unpack
i = self.__pos
self.__pos = j = i + 4 * n
return self.unpackIntDict[n](self.__buf[i:j])
def unpack_farray_double(self, n):
if not self.unpackDoubleDict.has_key(n):
fmt = ">" + "d" * n
self.unpackDoubleDict[n] = Struct(fmt).unpack
i = self.__pos
self.__pos = j = i + 8 * n
return self.unpackDoubleDict[n](self.__buf[i:j])
def _compile(fmt):
# Internal: compile struct pattern
if len(_cache) >= _MAXCACHE:
_cache.clear()
s = Struct(fmt)
_cache[fmt] = s
return s
def py_djb_hash(s):
'''Return the value of DJB's hash function for the given 8-bit string.'''
h = 5381
for c in s:
h = (((h << 5) + h) ^ ord(c)) & 0xffffffff
return h
try:
from _cdblib import djb_hash
except ImportError:
djb_hash = py_djb_hash
read_2_le4 = Struct('<LL').unpack
write_2_le4 = Struct('<LL').pack
class Reader(object):
'''A dictionary-like object for reading a Constant Database accessed
through a string or string-like sequence, such as mmap.mmap().'''
def __init__(self, data, hashfn=djb_hash):
'''Create an instance reading from a sequence and using hashfn to hash
keys.'''
if len(data) < 2048:
raise IOError('CDB too small')
self.data = data
self.hashfn = hashfn
5381
>>> py_djb_hash('\x01')
177572
>>> py_djb_hash('€')
193278953
"""
h = 5381
for c in s.encode('UTF-8'):
h = (((h << 5) + h) ^ c) & 0xffffffff
return h
# 2014-03-04 bd808: removed try block for importing C hash implementation
DJB_HASH = py_djb_hash
READ_2_LE4 = Struct('<LL').unpack
WRITE_2_LE4 = Struct('<LL').pack
class Reader(object):
"""
A dictionary-like object for reading a Constant Database.
Reader accesses through a string or string-like sequence
such as mmap.mmap().
"""
def __init__(self, data, hashfn=DJB_HASH):
"""
Create an instance reading from a sequence and hash keys using hashfn.
>>> Reader(data=b'')
from _struct import Struct, unpack_from, pack
import numpy as np
import lib.geo as geo
from enum import Enum
# UNPACKERS
UINT8 = Struct('<B').unpack_from
UINT16 = Struct('<H').unpack_from
UINT16_2D = Struct('<HH').unpack_from
SINT16 = Struct('<h').unpack_from
UINT32 = Struct('<L').unpack_from
SINT32 = Struct('<l').unpack_from
FLOAT32 = Struct('<f').unpack_from
FLOAT32_2D = Struct('<ff').unpack_from
FLOAT32_3D = Struct('<fff').unpack_from
RGBA = Struct('<ffff').unpack_from
FLOAT64 = Struct('<d').unpack_from
FLOAT64_2D = Struct('<dd').unpack_from
FLOAT64_3D = Struct('<ddd').unpack_from
DATETIME = Struct('<Q').unpack_from
def getEntityRef(data, offset):
index, i = getSInt32(data, offset)
return index, i
def getTagChar(data, index):
return data[index], index + 1
