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import io
def transfer(reader, writer, content_length = None, buffer_size = io.DEFAULT_BUFFER_SIZE):
if content_length is None:
while (data := reader.read(buffer_size)):
writer.write(data)
else:
remaining = content_length
while remaining > 0:
size = min(buffer_size, remaining)
writer.write(reader.read(size))
remaining -= size
def sanitize_filename(s: str) -> str:
return '.'.join([sanitize_filename_part(p) for p in s.split('.')])
def sanitize_filename_part(s: str) -> str:
alnum_or_space = ''.join([c if c.isalnum() else ' ' for c in s])
return '-'.join(alnum_or_space.split())
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