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Coding workflows · Restricted chunked-body decoding
03
A concrete starting point
Decode a restricted chunked body from at most 65536 bytes with a 4096-byte output limit. Test embedded CRLF and the zero chunk, rejecting truncation, extensions, trailers and bytes after the terminator.
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Restricted chunked-body decoding
A concrete starting point
def chunk_body(wire):
if type(wire) is not bytes or len(wire) > 65536:
raise ValueError("bounded bytes")
pos, body = 0, bytearray()
while True:
end = wire.find(b"\r\n", pos)
token = wire[pos:end] if end >= 0 else b""
if not 1 <= len(token) <= 8 or any(
c not in b"0123456789abcdefABCDEF" for c in token):
raise ValueError("plain hexadecimal size")
size, pos = int(token, 16), end + 2
if size == 0:
if wire[pos:] != b"\r\n":
raise ValueError("no trailers or extra bytes")
return bytes(body)
if len(body) + size > 4096:
raise ValueError("body limit")
if pos + size + 2 > len(wire):
raise ValueError("truncated chunk")
if wire[pos + size:pos + size + 2] != b"\r\n":
raise ValueError("chunk delimiter")
body.extend(wire[pos:pos + size])
pos += size + 2The example is a starting point for a real project, not a claim that generated code is already tested. Adjust paths, dependencies and expected behavior to match your application.