139 lines
4.5 KiB
Plaintext
139 lines
4.5 KiB
Plaintext
#####################################
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## Created by briandeheus ##
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## https://github.com/briandeheus ##
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## Implementation and changes ##
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## LoafyLemon ##
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#####################################
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init python in image_payload:
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import binascii
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import struct
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import zlib
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import os
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CHUNK_TYPE_END = "IEND"
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CHUNK_TYPE_PUNK = "wtSi"
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MAX_BYTES = 2147483647
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SIGNATURE_BYTES = 8
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BYTES_IN_KB = 2014
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def bytes_to_hex(b):
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return b.hex()
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def bytes_to_utf(b):
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return b.decode()
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def bytes_to_int(b):
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return int(bytes_to_hex(b), 16)
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def read_bytes(f, byte_count: int):
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return f.read(byte_count)
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def rewind_bytes(f, byte_count):
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f.seek(f.tell() - byte_count)
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def get_file_length(f):
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f.seek(0, os.SEEK_END)
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file_length = f.tell()
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f.seek(0)
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return file_length
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def read_chunk(f):
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chunk_size = read_bytes(f, 4)
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chunk_type = read_bytes(f, 4)
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chunk_content = read_bytes(f, bytes_to_int(chunk_size))
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chunk_crc = read_bytes(f, 4)
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return [chunk_size, chunk_type, chunk_content, chunk_crc]
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def inject_punk_chunk(f, content):
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chunk_size = len(content)
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if chunk_size > MAX_BYTES:
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raise ValueError(f"Cannot inject more than {MAX_BYTES} bytes")
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print(f"Injecting {CHUNK_TYPE_PUNK} chunk {chunk_size / BYTES_IN_KB} kb")
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# Create a byte array to store our chunk data in.
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tmp_bytes = bytearray()
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# First write the chunk type
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tmp_bytes.extend(CHUNK_TYPE_PUNK.encode())
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# Now write the bytes of whatever we're trying to hide
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tmp_bytes.extend(content)
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# Write the chunk size
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f.write(bytearray(struct.pack("!i", chunk_size)))
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# And the content
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f.write(tmp_bytes)
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crc = binascii.crc32(tmp_bytes)
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crc_bytes = crc.to_bytes(4, "big")
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print("Chunk CRC", bytes_to_hex(crc_bytes))
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f.write(crc_bytes)
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print("Chunk injected!")
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def list(input):
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path = os.path.join(renpy.config.gamedir, "outfits", input)
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with open(path, "rb") as input_file:
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input_file_length = get_file_length(input_file)
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input_file.read(SIGNATURE_BYTES)
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while True:
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chunk_size, chunk_type, chunk_content, chunk_crc = read_chunk(input_file)
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chunk_type_str = bytes_to_utf(chunk_type)
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print(f"Chunk {chunk_type_str}, {bytes_to_int(chunk_size)} bytes")
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if input_file.tell() >= input_file_length:
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return
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def inject(input, output, content):
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input_path = os.path.join(renpy.config.gamedir, "outfits", input)
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output_path = os.path.join(renpy.config.gamedir, "outfits", output)
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content = zlib.compress(str(content).encode())
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with open(input_path, "rb") as input_file, open(output_path, "wb") as output_file:
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input_file_length = get_file_length(input_file)
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output_file.write(input_file.read(SIGNATURE_BYTES))
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while True:
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chunk_size, chunk_type, chunk_content, chunk_crc = read_chunk(input_file)
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chunk_type_str = bytes_to_utf(chunk_type)
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print(f"Chunk {chunk_type_str}, {bytes_to_int(chunk_size)} bytes")
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if chunk_type_str == CHUNK_TYPE_END:
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inject_punk_chunk(output_file, content)
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output_file.write(chunk_size)
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output_file.write(chunk_type)
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output_file.write(chunk_content)
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output_file.write(chunk_crc)
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if input_file.tell() >= input_file_length:
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return
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def extract(input):
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print("Attempting to extract punked data from", input)
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path = os.path.join(renpy.config.gamedir, input)
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with open(path, "rb") as input_file:
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input_file_length = get_file_length(input_file)
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input_file.read(SIGNATURE_BYTES)
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while True:
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chunk_size, chunk_type, chunk_content, chunk_crc = read_chunk(input_file)
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chunk_type_str = bytes_to_utf(chunk_type)
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if chunk_type_str == CHUNK_TYPE_PUNK:
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print("Found a punk chunk worth", bytes_to_int(chunk_size), "bytes")
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return zlib.decompress(chunk_content).decode()
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if input_file.tell() >= input_file_length:
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print("No punked data found")
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return
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