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from ctypes import *
import os
import struct
from typing import Any
class Node:
def __init__(self, data: Any, left, right) -> None:
self.data = data
self.left: Node = left
self.right: Node = right
def is_leaf(self):
return self.left == None and self.right == None
const = [
0x14, 0x62, 0xe3, 0x8d, 0x32, 0x9e, 0xdb, 0x63, 0x5e, 0x82, 0x53, 0xd5, 0x89, 0xcc, 0x2b, 0xbc,
0x69, 0x7d, 0x4d, 0x37, 0x28, 0xb2, 0xef, 0x46, 0xed, 0x2a, 0xde, 0xc6, 0x8a, 0x44, 0x7a, 0x61,
0xae, 0x13, 0x52, 0x70, 0xbf, 0xe6, 0x1f, 0xaf, 0x90, 0x97, 0x9a, 0xf7, 0x31, 0x43, 0xc1, 0xf3,
0xa6, 0xb4, 0xa8, 0x30, 0x9b, 0xab, 0x00, 0xcd, 0xb3, 0xe1, 0x7c, 0x39, 0xfc, 0xc7, 0x94, 0x3c,
0x71, 0x7e, 0x19, 0xdd, 0x05, 0xb6, 0x10, 0x8f, 0xd9, 0x4c, 0x40, 0x9f, 0xdf, 0x41, 0x6d, 0x1d,
0x45, 0xa1, 0xb1, 0x8e, 0x8b, 0xff, 0x1e, 0x34, 0xa5, 0x4a, 0x96, 0x0a, 0xdc, 0x08, 0xd7, 0xe9,
0x20, 0x15, 0xcf, 0xb9, 0xd6, 0xb8, 0xbd, 0x26, 0x77, 0x80, 0x2f, 0xd1, 0xc3, 0x17, 0x68, 0x56,
0x98, 0x0d, 0x42, 0x91, 0x83, 0x54, 0x5c, 0xb5, 0xf0, 0x50, 0x79, 0xe7, 0xa2, 0x60, 0x6e, 0xa9,
0x16, 0xf6, 0xd0, 0x47, 0xf2, 0x48, 0x0e, 0x18, 0xc8, 0x3b, 0xb0, 0x38, 0x0b, 0x67, 0xaa, 0x24,
0x1c, 0xfa, 0x5f, 0x5b, 0x06, 0x36, 0xa3, 0x03, 0x59, 0x5a, 0x87, 0x23, 0x2c, 0x73, 0x12, 0xf8,
0xfd, 0xce, 0x93, 0xfb, 0x49, 0x57, 0xc9, 0x6a, 0x6b, 0xe2, 0xac, 0x07, 0x88, 0x84, 0xd8, 0xeb,
0x2d, 0xd3, 0x92, 0x21, 0x99, 0x81, 0x78, 0xba, 0xe5, 0x85, 0x65, 0xe0, 0x5d, 0xbe, 0xa4, 0x4e,
0xf1, 0x4f, 0x51, 0x64, 0x0f, 0x35, 0x76, 0x6c, 0xf9, 0x3a, 0x27, 0xc5, 0xf5, 0xda, 0xa7, 0x95,
0xcb, 0x25, 0x9d, 0xca, 0x75, 0xb7, 0x9c, 0x1b, 0x0c, 0x7b, 0x58, 0x3e, 0xe4, 0x2e, 0x3f, 0x55,
0xee, 0x4b, 0x09, 0xfe, 0x1a, 0x7f, 0xa0, 0x29, 0xea, 0xc4, 0x8c, 0x86, 0x3d, 0xad, 0xe8, 0x66,
0x6f, 0x33, 0x02, 0xd2, 0xec, 0x22, 0xf4, 0xd4, 0x01, 0xc2, 0x74, 0xbb, 0xc0, 0x04, 0x72, 0x11
]
r_const = [0]*256
out_data = []
def read_file(path: str):
with open(path, 'rb') as f:
return f.read()
def build_haffuman(node: Node, frequency_table):
for i, v in enumerate(frequency_table):
cur = node
for j in v:
new = Node(None, None, None)
if j == '0':
if cur.left != None:
new.left = cur.left.left
new.right = cur.left.right
cur.left = new
else:
if cur.right != None:
new.left = cur.right.left
new.right = cur.right.right
cur.right = new
cur = new
cur.data = i
file = read_file(os.path.join(os.getcwd(), 'input.crypt'))
offset = 4
frequency_table_size = c_uint16(
struct.unpack_from('<H', file, offset)[0]).value
offset += 2
frequency_table = list(file[offset:offset + frequency_table_size])
offset += frequency_table_size
print(f"Frequncy table size: {frequency_table_size}")
ori_file_size = c_uint16(struct.unpack_from('<I', file, offset)[0]).value
offset += 4
print(f"Origin file size: {ori_file_size}")
zip_data = list(file)[offset: offset + ori_file_size]
for i, v in enumerate(const):
r_const[v] = i
for i, v in enumerate(frequency_table):
frequency_table[i] = r_const[v]
total = c_uint32(0)
each_data_to_save = c_uint8(0)
code_array = [0] * 256
for i in range(256):
index = i
total = 0
j = 0
while True:
if total + (1 << j) > index:
break
total += (1 << j)
j += 2
each_data_to_save.value = 1 << j
each_data_to_save.value = (index - total)
bin_data = bin(each_data_to_save.value)[2:]
count_bit_save = int(5 + j / 2)
for i in range(count_bit_save - len(bin_data)):
bin_data = '0' + bin_data
if count_bit_save == 9:
bin_data = '1' + bin_data[1:]
code_array[index] = bin_data
haffuman = Node(None, None, None)
build_haffuman(haffuman, code_array)
zip_data = [bin(i)[2:] for i in zip_data]
for i, v in enumerate(zip_data):
k = v
for j in range(8 - len(v)):
k = '0' + k
zip_data[i] = k
zip_data = ''.join(zip_data)
pos = 0
cur = haffuman
data = []
while pos < len(zip_data):
if cur.is_leaf():
data.append(frequency_table[cur.data])
cur = haffuman
if zip_data[pos] == '0':
cur = cur.left
else:
cur = cur.right
pos += 1
with open(os.path.join(os.getcwd(), 'out.bin'), 'wb') as f:
f.write(bytes(data))
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