oss_util.py 文件源码

def md5sum2(filename, offset=0, partsize=0):
    m = get_md5()
    fp = open(filename, 'rb')
    if offset > os.path.getsize(filename):
        fp.seek(os.SEEK_SET, os.SEEK_END)
    else:
        fp.seek(offset)

    left_len = partsize
    BufferSize = BUFFER_SIZE
    while True:
        if left_len <= 0:
            break
        elif left_len < BufferSize:
            buffer_content = fp.read(left_len)
        else:
            buffer_content = fp.read(BufferSize)
        m.update(buffer_content)
        left_len = left_len - len(buffer_content)
    md5sum = m.hexdigest()
    return md5sum