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The maximum length for the encoded string is 2**16-1 (65535) bytes.
An assertion error will result if the encoded string is longer.
Parameters
----------
s: str
String to be encoded.
f: file
File-like object.
Returns
-------
int
Number of bytes written to f.
""""""
encode = codecs.getencoder('utf8')
encoded_str_bytes, num_encoded_chars = encode(s)
num_encoded_str_bytes = len(encoded_str_bytes)
assert 0 <= num_encoded_str_bytes <= 2**16-1
num_encoded_bytes = num_encoded_str_bytes + 2
f.write(FIELD_U8.pack((num_encoded_str_bytes & 0xff00) >> 8))
f.write(FIELD_U8.pack(num_encoded_str_bytes & 0x00ff))
f.write(encoded_str_bytes)
return num_encoded_bytes"
635,"def decode_utf8(f):
""""""Decode a utf-8 string encoded as described in MQTT Version
3.1.1 section 1.5.3 line 177. This is a 16-bit unsigned length
followed by a utf-8 encoded string.
Parameters
----------
f: file
File-like object with read method.
Raises
------
UnderflowDecodeError
Raised when a read failed to extract enough bytes from the
underlying stream to decode the string.
Utf8DecodeError
When any code point in the utf-8 string is invalid.
Returns
-------
int
Number of bytes consumed.
str
A string utf-8 decoded from ``f``.
""""""
decode = codecs.getdecoder('utf8')
buf = f.read(FIELD_U16.size)
if len(buf) < FIELD_U16.size:
raise UnderflowDecodeError()
(num_utf8_bytes,) = FIELD_U16.unpack_from(buf)
num_bytes_consumed = FIELD_U16.size + num_utf8_bytes
buf = f.read(num_utf8_bytes)
if len(buf) < num_utf8_bytes:
raise UnderflowDecodeError()
try:
s, num_chars = decode(buf, 'strict')
except UnicodeError as e:
raise Utf8DecodeError(e)
return num_bytes_consumed, s"
636,"def encode_varint(v, f):
""""""Encode integer `v` to file `f`.
Parameters
----------
v: int
Integer v >= 0.
f: file
Object containing a write method.
Returns
-------
int
Number of bytes written.
""""""
assert v >= 0
num_bytes = 0
while True:
b = v % 0x80
v = v // 0x80
if v > 0:
b = b | 0x80
f.write(FIELD_U8.pack(b))
num_bytes += 1