class InternationalText(bin.Structure, encoding='utf8'):
keyword = bin.String()
is_compressed = bin.Integer(size=1)
compression = bin.Integer(size=1, choices=COMPRESSION_CHOICES)
language = bin.String()
translated_keyword = bin.String()
content = bin.Bytes(size=bin.Remainder) # TODO: decompress
class _669(bin.File):
marker = bin.FixedString('if')
message = bin.List(bin.String(size=36, encoding='ascii', padding=' '), size=3)
sample_count = bin.PositiveInteger(size=1, max_value=64)
pattern_count = bin.PositiveInteger(size=1, max_value=128)
restart_position = bin.PositiveInteger(size=1)
pattern_order = bin.List(bin.PositiveInteger(size=1, max_value=128), size=128)
pattern_tempos = bin.List(bin.PositiveInteger(size=1), size=128)
pattern_breaks = bin.List(bin.PositiveInteger(size=1), size=128)
samples = bin.List(Sample, size=sample_count)
patterns = bin.List(Pattern, size=pattern_count)
sample_data = bin.ByteString(size=bin.REMAINDER)
@sample_data.getter
def sample_data(self, data):
offset = 0
output = []
for info in self.samples:
output.append(data[offset:offset + info.size])
offset += info.size
return output
@sample_data.setter
def sample_data(self, data_list):
return ''.join(data_list)
def __iter__(self):
for index in self.pattern_order:
yield self.patterns[index]
def __unicode__(self):
return self.message[0]
class Options:
endianness = bin.LittleEndian
class GIF(bin.Structure, endianness=bin.LittleEndian, encoding='ascii'):
tag = bin.FixedString('GIF')
version = bin.String(size=3, choices=VERSIONS)
# with tag == 'GIF':
# version = bin.String(size=3, choices=VERSIONS)
screen = bin.SubStructure(ScreenDescriptor)
@property
def width(self):
return self.screen.width
@property
def height(self):
return self.screen.height
class Chunk(bin.Chunk, encoding='ascii'):
"""
A special chunk for PNG, which puts the size before the type
and includes a CRC field for verifying data integrity.
"""
size = bin.Integer(size=4)
id = bin.String(size=4)
payload = bin.Payload(size=size)
crc = bin.CRC32(first=id)
@property
def is_critical(self):
# Critical chunks will always have an uppercase letter for the
# first character in the type. Ancillary will always be lower.
return self.type[0].upper() == self.type[0]
@property
def is_public(self):
# Public chunks will always have an uppercase letter for the
# second character in the type. Private will always be lower.
return self.type[1].upper() == self.type[1]
class Chunk(bin.Chunk):
id = bin.String(size=4, encoding='ascii')
size = bin.Integer(size=4)
payload = bin.Payload(size=size)
class Form(bin.Chunk, encoding='ascii'):
tag = bin.FixedString('FORM')
size = bin.Integer(size=4)
id = bin.String(size=4)
payload = bin.Payload(size=size)
class Comment(bin.Structure):
value = bin.String(encoding='utf8', size=bin.Remainder)
def __str__(self):
return self.value
class TestStructure(bin.Structure):
integer = bin.Integer('number', size=1)
string = bin.String(encoding='ascii')
class TestStructure(bin.Structure):
forty_two = bin.Integer(size=2, endianness=bin.LittleEndian)
sixty_six = bin.Integer(size=1)
valid = bin.String(encoding='ascii')
test = bin.String(encoding='ascii')
class TestStructure(bin.Structure):
length = bin.Integer('number', size=1)
content = bin.String(encoding='ascii', size=length)
class ICCProfile(bin.Structure):
name = bin.String(encoding='latin-1')
compression = bin.Integer(size=1, choices=COMPRESSION_CHOICES)
profile = bin.Bytes(size=bin.Remainder) # TODO: decompress
class CompressedText(bin.Structure, encoding='latin-1'):
keyword = bin.String()
compression = bin.Integer(size=1, choices=COMPRESSION_CHOICES)
content = bin.Bytes(size=bin.Remainder) # TODO: decompress
class Text(bin.Structure, encoding='latin-1'):
keyword = bin.String()
content = bin.String(size=bin.Remainder)
class SuggestedPalette(bin.Structure):
name = bin.String(encoding='latin-1')
sample_depth = bin.Integer(size=1)
colors = bin.List(bin.SubStructure(SuggestedPaletteEntry), size=bin.Remainder)
class GIF(bin.Structure, endianness=bin.LittleEndian, encoding='ascii'):
tag = bin.FixedString('GIF')
version = bin.String(size=3, choices=GIF_VERSIONS)
width = bin.Integer(size=2)
height = bin.Integer(size=2)