marshal.py 文件源码

def varint_pack(big):
    pos = True
    if big == 0:
        return b'\x00'
    if big < 0:
        bytelength = bit_length(abs(big) - 1) // 8 + 1
        big = (1 << bytelength * 8) + big
        pos = False
    revbytes = bytearray()
    while big > 0:
        revbytes.append(big & 0xff)
        big >>= 8
    if pos and revbytes[-1] & 0x80:
        revbytes.append(0)
    revbytes.reverse()
    return six.binary_type(revbytes)