def check_and_patch_data_size(self, random):
# append new item
# when the biggest item(first time) or the last append item(other time) are not big enough.
# but set a limit size (64) to avoid stack overflow.
if self.data_size_list0[-1] < 1300 and len(self.data_size_list0) < 64:
self.data_size_list0.append((int)(random.next() % 2340 % 2040 % 1440))
self.check_and_patch_data_size(random)
python类next()的实例源码
def init_data_size(self, key):
if self.data_size_list0:
self.data_size_list0 = []
random = xorshift128plus()
random.init_from_bin(key)
# ??????12~24-1
list_len = random.next() % (8 + 16) + (4 + 8)
for i in range(0, list_len):
self.data_size_list0.append((int)(random.next() % 2340 % 2040 % 1440))
self.data_size_list0.sort()
old_len = len(self.data_size_list0)
self.check_and_patch_data_size(random)
# if check_and_patch_data_size are work, re-sort again.
if old_len != len(self.data_size_list0):
self.data_size_list0.sort()
def next(self):
x = self.v0
y = self.v1
self.v0 = y
x ^= ((x & xorshift128plus.mov_mask) << 23)
x ^= (y ^ (x >> 17) ^ (y >> 26)) & xorshift128plus.max_int
self.v1 = x
return (x + y) & xorshift128plus.max_int
def init_from_bin_len(self, bin, length):
bin += b'\0' * 16
bin = struct.pack('<H', length) + bin[2:]
self.v0 = struct.unpack('<Q', bin[:8])[0]
self.v1 = struct.unpack('<Q', bin[8:16])[0]
for i in range(4):
self.next()
def rnd_data_len(self, buf_size, last_hash, random):
if buf_size > 1440:
return 0
random.init_from_bin_len(last_hash, buf_size)
if buf_size > 1300:
return random.next() % 31
if buf_size > 900:
return random.next() % 127
if buf_size > 400:
return random.next() % 521
return random.next() % 1021
def udp_rnd_data_len(self, last_hash, random):
random.init_from_bin(last_hash)
return random.next() % 127
def rnd_start_pos(self, rand_len, random):
if rand_len > 0:
return random.next() % 8589934609 % rand_len
return 0
def next(self):
x = self.v0
y = self.v1
self.v0 = y
x ^= ((x & xorshift128plus.mov_mask) << 23)
x ^= (y ^ (x >> 17) ^ (y >> 26)) & xorshift128plus.max_int
self.v1 = x
return (x + y) & xorshift128plus.max_int
def init_from_bin_len(self, bin, length):
bin += b'\0' * 16
bin = struct.pack('<H', length) + bin[2:]
self.v0 = struct.unpack('<Q', bin[:8])[0]
self.v1 = struct.unpack('<Q', bin[8:16])[0]
for i in range(4):
self.next()
def rnd_data_len(self, buf_size, last_hash, random):
if buf_size > 1440:
return 0
random.init_from_bin_len(last_hash, buf_size)
if buf_size > 1300:
return random.next() % 31
if buf_size > 900:
return random.next() % 127
if buf_size > 400:
return random.next() % 521
return random.next() % 1021
def udp_rnd_data_len(self, last_hash, random):
random.init_from_bin(last_hash)
return random.next() % 127
def rnd_start_pos(self, rand_len, random):
if rand_len > 0:
return random.next() % 8589934609 % rand_len
return 0
def next(self):
x = self.v0
y = self.v1
self.v0 = y
x ^= ((x & xorshift128plus.mov_mask) << 23)
x ^= (y ^ (x >> 17) ^ (y >> 26)) & xorshift128plus.max_int
self.v1 = x
return (x + y) & xorshift128plus.max_int
def init_from_bin_len(self, bin, length):
bin += b'\0' * 16
bin = struct.pack('<H', length) + bin[2:]
self.v0 = struct.unpack('<Q', bin[:8])[0]
self.v1 = struct.unpack('<Q', bin[8:16])[0]
for i in range(4):
self.next()
def rnd_data_len(self, buf_size, last_hash, random):
if buf_size > 1440:
return 0
random.init_from_bin_len(last_hash, buf_size)
if buf_size > 1300:
return random.next() % 31
if buf_size > 900:
return random.next() % 127
if buf_size > 400:
return random.next() % 521
return random.next() % 1021
def udp_rnd_data_len(self, last_hash, random):
random.init_from_bin(last_hash)
return random.next() % 127
def rnd_start_pos(self, rand_len, random):
if rand_len > 0:
return random.next() % 8589934609 % rand_len
return 0
