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constructor.py
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#!/usr/bin/python3
import os
import sys
import json
byte_val = 0
bit_cnt = 0
def write_byte_array_2_file(byte_array, file_path):
with open(file_path, "wb") as f:
f.write(byte_array)
def construct_val_2_bits(byte_array, int_val, bit_size):
global byte_val
global bit_cnt
for i in range(bit_size):
byte_val |= ((int_val >> i) & 0x1) << bit_cnt
bit_cnt += 1
if (bit_cnt == 8):
byte_array.append(byte_val)
bit_cnt = 0
byte_val = 0
def construct_stream_2_bits(byte_array, int_val, bit_size):
global byte_val
global bit_cnt
for i in range(bit_size):
byte_val |= ((int_val >> (bit_size - 1 - i)) & 0x1) << bit_cnt
bit_cnt += 1
if (bit_cnt == 8):
byte_array.append(byte_val)
bit_cnt = 0
byte_val = 0
def fill_reserved_bits_with_0(byte_array):
global byte_val
global bit_cnt
if bit_cnt != 0:
for i in range(8 - bit_cnt):
byte_val |= 0 << bit_cnt
bit_cnt += 1
if (bit_cnt == 8):
byte_array.append(byte_val)
bit_cnt = 0
byte_val = 0
def flush_final(byte_array):
global byte_val
global bit_cnt
if bit_cnt != 0:
byte_array.append(byte_val)
bit_cnt = 0
byte_val = 0
def construct_deflate_header(json_data, byte_array):
construct_val_2_bits(byte_array, json_data["BFINAL"]["value"],
json_data["BFINAL"]["bit_size"])
def construct_deflate_stored_block(json_data, byte_array):
fill_reserved_bits_with_0(byte_array)
construct_val_2_bits(byte_array, json_data["LEN"]["value"],
json_data["LEN"]["bit_size"])
construct_val_2_bits(byte_array, json_data["NLEN"]["value"],
json_data["NLEN"]["bit_size"])
raw_data_list = []
for raw_data_str in json_data["RAW_DATA"]:
symbol_list = list(filter(lambda x : x, raw_data_str.split(" ")))
raw_data_list += symbol_list
if raw_data_list:
for raw_data in raw_data_list:
byte_array.append(int(raw_data, 16))
def construct_deflate_fix_block(json_data, byte_array):
length_extra_bits_table = [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0]
distance_extra_bits_table = [
0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13]
literal_length_huffman_table = []
distance_huffman_table = []
literal_length_symbol_dict = {}
distance_symbol_dict = {}
literal_length_huffman_table = json_data["extracted_literal_length_huffman_table"]["items"]
for items in literal_length_huffman_table:
literal_length_symbol_dict[items["symbol_value"]] = items["index"]
if "items" in json_data["extracted_distance_huffman_table"]:
distance_huffman_table = json_data["extracted_distance_huffman_table"]["items"]
for items in distance_huffman_table:
distance_symbol_dict[items["symbol_value"]] = items["index"]
decoded_symbol_list = []
for symbol_str in json_data["ENCODED_BIT_STREAM"]:
symbol_list = list(filter(lambda x : x, symbol_str.split(" ")))
decoded_symbol_list += symbol_list
symbol_list_length = len(decoded_symbol_list)
symbol_list_index = 0
while (symbol_list_index < symbol_list_length):
if "0x" in decoded_symbol_list[symbol_list_index]:
symbol_value = int(decoded_symbol_list[symbol_list_index], 16)
huffman_table_index = literal_length_symbol_dict[symbol_value]
construct_stream_2_bits(byte_array,
literal_length_huffman_table[huffman_table_index]["encoded_value"],
literal_length_huffman_table[huffman_table_index]["encoded_bit_size"])
symbol_list_index += 1
elif "256" == decoded_symbol_list[symbol_list_index]:
symbol_value = int(decoded_symbol_list[symbol_list_index])
huffman_table_index = literal_length_symbol_dict[symbol_value]
construct_stream_2_bits(byte_array,
literal_length_huffman_table[huffman_table_index]["encoded_value"],
literal_length_huffman_table[huffman_table_index]["encoded_bit_size"])
symbol_list_index += 1
else:
length_value = int(decoded_symbol_list[symbol_list_index])
huffman_table_index = literal_length_symbol_dict[length_value]
construct_stream_2_bits(byte_array,
literal_length_huffman_table[huffman_table_index]["encoded_value"],
literal_length_huffman_table[huffman_table_index]["encoded_bit_size"])
length_extra_value = int(decoded_symbol_list[symbol_list_index + 1])
length_extra_bits = length_extra_bits_table[length_value - 257]
construct_val_2_bits(byte_array, length_extra_value,
length_extra_bits)
distance_value = int(decoded_symbol_list[symbol_list_index + 2])
huffman_table_index = distance_symbol_dict[distance_value]
construct_stream_2_bits(byte_array,
distance_huffman_table[huffman_table_index]["encoded_value"],
distance_huffman_table[huffman_table_index]["encoded_bit_size"])
distance_extra_value = int(decoded_symbol_list[symbol_list_index + 3])
distance_extra_bits = distance_extra_bits_table[distance_value]
construct_val_2_bits(byte_array, distance_extra_value,
distance_extra_bits)
symbol_list_index += 4
def construct_deflate_dynamic_block(json_data, byte_array):
length_extra_bits_table = [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0]
distance_extra_bits_table = [
0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13]
literal_length_huffman_table = []
distance_huffman_table = []
literal_length_symbol_dict = {}
distance_symbol_dict = {}
construct_val_2_bits(byte_array, json_data["HLIT"]["value"],
json_data["HLIT"]["bit_size"])
construct_val_2_bits(byte_array, json_data["HDIST"]["value"],
json_data["HDIST"]["bit_size"])
construct_val_2_bits(byte_array, json_data["HCLEN"]["value"],
json_data["HCLEN"]["bit_size"])
for code_length in json_data["CODE_LENGTH_TABLE"]:
if code_length["stored"]:
construct_val_2_bits(byte_array, code_length["value"],
code_length["bit_size"])
for literal_length_distance in json_data["LITERAL_LENGTH_DISTANCE_TABLE"]:
construct_stream_2_bits(byte_array, literal_length_distance["value"],
literal_length_distance["bit_size"])
if "extra" in literal_length_distance:
construct_val_2_bits(byte_array, literal_length_distance["extra"]["value"],
literal_length_distance["extra"]["bit_size"])
literal_length_huffman_table = json_data["extracted_literal_length_huffman_table"]["items"]
for items in literal_length_huffman_table:
literal_length_symbol_dict[items["symbol_value"]] = items["index"]
if "items" in json_data["extracted_distance_huffman_table"]:
distance_huffman_table = json_data["extracted_distance_huffman_table"]["items"]
for items in distance_huffman_table:
distance_symbol_dict[items["symbol_value"]] = items["index"]
decoded_symbol_list = []
for symbol_str in json_data["ENCODED_BIT_STREAM"]:
symbol_list = list(filter(lambda x : x, symbol_str.split(" ")))
decoded_symbol_list += symbol_list
symbol_list_length = len(decoded_symbol_list)
symbol_list_index = 0
while (symbol_list_index < symbol_list_length):
if "0x" in decoded_symbol_list[symbol_list_index]:
symbol_value = int(decoded_symbol_list[symbol_list_index], 16)
huffman_table_index = literal_length_symbol_dict[symbol_value]
construct_stream_2_bits(byte_array,
literal_length_huffman_table[huffman_table_index]["encoded_value"],
literal_length_huffman_table[huffman_table_index]["encoded_bit_size"])
symbol_list_index += 1
elif "256" == decoded_symbol_list[symbol_list_index]:
symbol_value = int(decoded_symbol_list[symbol_list_index])
huffman_table_index = literal_length_symbol_dict[symbol_value]
construct_stream_2_bits(byte_array,
literal_length_huffman_table[huffman_table_index]["encoded_value"],
literal_length_huffman_table[huffman_table_index]["encoded_bit_size"])
symbol_list_index += 1
else:
length_value = int(decoded_symbol_list[symbol_list_index])
huffman_table_index = literal_length_symbol_dict[length_value]
construct_stream_2_bits(byte_array,
literal_length_huffman_table[huffman_table_index]["encoded_value"],
literal_length_huffman_table[huffman_table_index]["encoded_bit_size"])
length_extra_value = int(decoded_symbol_list[symbol_list_index + 1])
length_extra_bits = length_extra_bits_table[length_value - 257]
construct_val_2_bits(byte_array, length_extra_value,
length_extra_bits)
distance_value = int(decoded_symbol_list[symbol_list_index + 2])
huffman_table_index = distance_symbol_dict[distance_value]
construct_stream_2_bits(byte_array,
distance_huffman_table[huffman_table_index]["encoded_value"],
distance_huffman_table[huffman_table_index]["encoded_bit_size"])
distance_extra_value = int(decoded_symbol_list[symbol_list_index + 3])
distance_extra_bits = distance_extra_bits_table[distance_value]
construct_val_2_bits(byte_array, distance_extra_value,
distance_extra_bits)
symbol_list_index += 4
def construct_deflate_bin(json_data, byte_array):
for deflate_block in json_data:
construct_deflate_header(deflate_block, byte_array)
if deflate_block["BTYPE"]["value"] == 0:
construct_deflate_stored_block(deflate_block, byte_array)
elif deflate_block["BTYPE"]["value"] == 1:
construct_deflate_fix_block(deflate_block, byte_array)
elif deflate_block["BTYPE"]["value"] == 2:
construct_deflate_dynamic_block(deflate_block, byte_array)
flush_final(byte_array)
def construct_zlib_header(json_data, byte_array):
construct_val_2_bits(byte_array, json_data["COMPRESSION_METHOD"]["value"],
json_data["COMPRESSION_METHOD"]["bit_size"])
construct_val_2_bits(byte_array, json_data["COMPRESSION_INFO"]["value"],
json_data["COMPRESSION_INFO"]["bit_size"])
construct_val_2_bits(byte_array, json_data["FLAGS"]["FCHECK"]["value"],
json_data["FLAGS"]["FCHECK"]["bit_size"])
construct_val_2_bits(byte_array, json_data["FLAGS"]["FDICT"]["value"],
json_data["FLAGS"]["FDICT"]["bit_size"])
construct_val_2_bits(byte_array, json_data["FLAGS"]["FLEVEL"]["value"],
json_data["FLAGS"]["FLEVEL"]["bit_size"])
def construct_zlib_footer(json_data, byte_array):
for checksum_str in json_data["value"]:
checksum_list = list(filter(lambda x : x, checksum_str.split(" ")))
for checksum_val in checksum_list:
byte_array.append(int(checksum_val, 16))
def construct_zlib_bin(json_data, byte_array):
construct_zlib_header(json_data["ZLIB_HEADER"], byte_array)
construct_deflate_bin(json_data["DEFLATE_BLOCK"], byte_array)
construct_zlib_footer(json_data["CHECKSUM_IN_FILE"], byte_array)
def construct_compressed_bin(json_data, output_file_path):
output_file_name = output_file_path
compressed_byte_array = bytearray()
if "ZLIB_FORMAT" in json_data:
construct_zlib_bin(json_data["ZLIB_FORMAT"], compressed_byte_array)
output_file_name += ".zlib"
elif "DEFLATE_BLOCK" in json_data:
construct_deflate_bin(json_data["DEFLATE_BLOCK"], compressed_byte_array)
output_file_name += ".defl"
write_byte_array_2_file(compressed_byte_array, output_file_name)
def main():
if len(sys.argv) < 2:
sys.exit(0)
compressed_json_file = sys.argv[1]
if not os.path.exists(compressed_json_file):
print(compressed_json_file + " not exists!")
sys.exit(0)
with open(compressed_json_file) as f:
json_data = json.load(f)
construct_compressed_bin(json_data, compressed_json_file)
if __name__ == "__main__":
main()