def DecodeVarint(buffer, pos):
result = 0
shift = 0
while 1:
b = six.indexbytes(buffer, pos)
result |= ((b & 0x7f) << shift)
pos += 1
if not (b & 0x80):
result &= mask
result = result_type(result)
return (result, pos)
shift += 7
if shift >= 64:
raise _DecodeError('Too many bytes when decoding varint.')
def DecodeVarint(buffer, pos):
result = 0
shift = 0
while 1:
b = six.indexbytes(buffer, pos)
result |= ((b & 0x7f) << shift)
pos += 1
if not (b & 0x80):
result &= mask
result = result_type(result)
return (result, pos)
shift += 7
if shift >= 64:
raise _DecodeError('Too many bytes when decoding varint.')
def ReadTag(buffer, pos):
"""Read a tag from the buffer, and return a (tag_bytes, new_pos) tuple.
We return the raw bytes of the tag rather than decoding them. The raw
bytes can then be used to look up the proper decoder. This effectively allows
us to trade some work that would be done in pure-python (decoding a varint)
for work that is done in C (searching for a byte string in a hash table).
In a low-level language it would be much cheaper to decode the varint and
use that, but not in Python.
"""
start = pos
while six.indexbytes(buffer, pos) & 0x80:
pos += 1
pos += 1
return (six.binary_type(buffer[start:pos]), pos)
def ReadTag(buffer, pos):
"""Read a tag from the memoryview, and return a (tag_bytes, new_pos) tuple.
We return the raw bytes of the tag rather than decoding them. The raw
bytes can then be used to look up the proper decoder. This effectively allows
us to trade some work that would be done in pure-python (decoding a varint)
for work that is done in C (searching for a byte string in a hash table).
In a low-level language it would be much cheaper to decode the varint and
use that, but not in Python.
Args:
buffer: memoryview object of the encoded bytes
pos: int of the current position to start from
Returns:
Tuple[bytes, int] of the tag data and new position.
"""
start = pos
while six.indexbytes(buffer, pos) & 0x80:
pos += 1
pos += 1
tag_bytes = buffer[start:pos].tobytes()
return tag_bytes, pos
def ReadTag(buffer, pos):
"""Read a tag from the memoryview, and return a (tag_bytes, new_pos) tuple.
We return the raw bytes of the tag rather than decoding them. The raw
bytes can then be used to look up the proper decoder. This effectively allows
us to trade some work that would be done in pure-python (decoding a varint)
for work that is done in C (searching for a byte string in a hash table).
In a low-level language it would be much cheaper to decode the varint and
use that, but not in Python.
Args:
buffer: memoryview object of the encoded bytes
pos: int of the current position to start from
Returns:
Tuple[bytes, int] of the tag data and new position.
"""
start = pos
while six.indexbytes(buffer, pos) & 0x80:
pos += 1
pos += 1
tag_bytes = buffer[start:pos].tobytes()
return tag_bytes, pos