class Tiff(object):
BYTEORDER={
'<': 'little-endian',
'>': 'big-endian'
}
def __init__(self, fp):
self.fp=fp
self.byteorder=None
self.magic=None
self.offset=None
self.br=None
self.directory=TiffRootDirectory()
self.readHeader() # sets self.offset
self.readIFDs(self.offset)
def readHeader(self):
last=None
for byte in self.fp.read(2):
if last != None and byte != last:
raise TiffException('Inconsistent TIFF byte order mark')
if ord(byte)==0b1001101: # MM, motorola, or big-endian
bo='>'
elif ord(byte)==0b1001001: # II, intel, or little-endian
bo='<'
else:
raise TiffException('Unknown byte order in file')
self.byteorder=self.BYTEORDER[bo]
last=byte
self.br=BinaryReader(self.fp, bo)
self.magic=self.br.read()
if int(self.magic) != 42:
raise TiffException('Invalid magic number')
self.offset=self.br.read(4, 'I')
def readIFDs(self, start):
done=False
while not done:
td=TiffDirectory(self.br, start)
self.directory.append(td)
if not td.next:
done=True
start=td.next
def readHeader(self):
last=None
for byte in self.fp.read(2):
if last != None and byte != last:
raise TiffException('Inconsistent TIFF byte order mark')
if ord(byte)==0b1001101: # MM, motorola, or big-endian
bo='>'
elif ord(byte)==0b1001001: # II, intel, or little-endian
bo='<'
else:
raise TiffException('Unknown byte order in file')
self.byteorder=self.BYTEORDER[bo]
last=byte
self.br=BinaryReader(self.fp, bo)
self.magic=self.br.read()
if int(self.magic) != 42:
raise TiffException('Invalid magic number')
self.offset=self.br.read(4, 'I')
def Parse(buffer: io.BytesIO, length: int = 0):
if (isinstance(buffer, io.BytesIO) is not True):
raise TypeError("Expecting buffer type but {0} given".format(
type(buffer)))
#Start bytes parsing
header = None
current_pos = buffer.tell()
buffer.seek(0, io.SEEK_END)
length_from_pos = buffer.tell()
buffer.seek(current_pos, io.SEEK_SET)
if (length_from_pos > 0):
reader = BinaryReader(buffer)
major_value = buffer.Read8Bits()
minor_value = buffer.Read8Bits()
build_value = buffer.Read16Bits()
version = Version(major_value, minor_value, build_value)
header = Header(version=version, )
return header
def read_dcu_header(filepath):
reader = BinaryReader(filepath)
magic = reader.read_u32()
print('0x%x' % magic, type(magic))
