def extract(cls, io):
ext_bytes = cls.prefix
while True:
subblock = SubBlock.extract(io)
ext_bytes += subblock.raw
if subblock.raw[0] == "\x00": break
return ext
def extract(cls, io):
ext_bytes = cls.prefix
while True:
subblock = SubBlock.extract(io)
ext_bytes += subblock.raw
if subblock.raw[0] == "\x00": break
return ext
def extract(cls, io):
ext_bytes = "\x21\xff"
block_size_bytes = io.read(1)
block_size = int(block_size_bytes.encode("hex"), 16)
ext_info = io.read(block_size)
ext_bytes += block_size_bytes + ext_info
while True:
subblock = SubBlock.extract(io)
ext_bytes += subblock.raw
if subblock.raw[0] == "\x00": break
return cls(ext_bytes)
def extract(cls, io):
ext_bytes = "\x21\xff"
block_size_bytes = io.read(1)
block_size = int(block_size_bytes.encode("hex"), 16)
ext_info = io.read(block_size)
ext_bytes += block_size_bytes + ext_info
while True:
subblock = SubBlock.extract(io)
ext_bytes += subblock.raw
if subblock.raw[0] == "\x00": break
return cls(ext_bytes)
def extract(cls, io):
img_bytes = "\x2c"
left = io.read(2)
top = io.read(2)
width = io.read(2)
height = io.read(2)
packed_byte = io.read(1)
unpacked_bits = '{0:08b}'.format(int(packed_byte.encode("hex"), 16))
local_color_table_len = int(unpacked_bits[0]) * pow(2, int(unpacked_bits[4:], 2) + 1)
local_color_table = io.read(3*local_color_table_len)
lzw_min = io.read(1)
img_bytes += left + top + width + height + packed_byte + local_color_table + lzw_min
while True:
subblock = SubBlock.extract(io)
img_bytes += subblock.raw
if subblock.raw[0] == "\x00": break
img = cls(img_bytes)
return img
def extract(cls, io):
img_bytes = "\x2c"
left = io.read(2)
top = io.read(2)
width = io.read(2)
height = io.read(2)
packed_byte = io.read(1)
unpacked_bits = '{0:08b}'.format(int(packed_byte.encode("hex"), 16))
local_color_table_len = int(unpacked_bits[0]) * pow(
2,
int(unpacked_bits[4:], 2) + 1)
local_color_table = io.read(3 * local_color_table_len)
lzw_min = io.read(1)
img_bytes += left + top + width + height + packed_byte + local_color_table + lzw_min
while True:
subblock = SubBlock.extract(io)
img_bytes += subblock.raw
if subblock.raw[0] == "\x00": break
img = cls(img_bytes)
return img
def encode(cls, comment_text):
ext_bytes = cls.prefix
sub_blocks = SubBlock.encode(comment_text)
ext_bytes += "".join(sb.raw for sb in sub_blocks)
return cls(ext_bytes)
def encode(cls, comment_text):
ext_bytes = cls.prefix
sub_blocks = SubBlock.encode(comment_text)
ext_bytes += "".join(sb.raw for sb in sub_blocks)
return cls(ext_bytes)
