def _parse_desc_length_file(cls, fileobj):
"""May raise ValueError"""
value = 0
for i in xrange(4):
try:
b = cdata.uint8(fileobj.read(1))
except cdata.error as e:
raise ValueError(e)
value = (value << 7) | (b & 0x7F)
if not b >> 7:
break
else:
raise ValueError("invalid descriptor length")
return value
def _parse_desc_length_file(cls, fileobj):
"""May raise ValueError"""
value = 0
for i in xrange(4):
try:
b = cdata.uint8(fileobj.read(1))
except cdata.error as e:
raise ValueError(e)
value = (value << 7) | (b & 0x7F)
if not b >> 7:
break
else:
raise ValueError("invalid descriptor length")
return value