human
What is a the Python program you requested given the following:
Complete the below
def apply_delta(src_buf, delta):

    ''''Based on the similar function in git\'s patch-delta.c.
    :param src_buf: Source buffer
    :param delta: Delta instructions'
    '''
assistant
#Here is the Python program you requested.
    if (not isinstance(src_buf, bytes)):
        src_buf = ''.join(src_buf)
    if (not isinstance(delta, bytes)):
        delta = ''.join(delta)
    out = []
    index = 0
    delta_length = len(delta)
    def get_delta_header_size(delta, index):
        size = 0
        i = 0
        while delta:
            cmd = ord(delta[index:(index + 1)])
            index += 1
            size |= ((cmd & (~ 128)) << i)
            i += 7
            if (not (cmd & 128)):
                break
        return (size, index)
    (src_size, index) = get_delta_header_size(delta, index)
    (dest_size, index) = get_delta_header_size(delta, index)
    assert (src_size == len(src_buf)), ('%d    vs    %d' % (src_size, len(src_buf)))
    while (index < delta_length):
        cmd = ord(delta[index:(index + 1)])
        index += 1
        if (cmd & 128):
            cp_off = 0
            for i in range(4):
                if (cmd & (1 << i)):
                    x = ord(delta[index:(index + 1)])
                    index += 1
                    cp_off |= (x << (i * 8))
            cp_size = 0
            for i in range(3):
                if (cmd & (1 << (4 + i))):
                    x = ord(delta[index:(index + 1)])
                    index += 1
                    cp_size |= (x << (i * 8))
            if (cp_size == 0):
                cp_size = 65536
            if (((cp_off + cp_size) < cp_size) or ((cp_off + cp_size) > src_size) or (cp_size > dest_size)):
                break
            out.append(src_buf[cp_off:(cp_off + cp_size)])
        elif (cmd != 0):
            out.append(delta[index:(index + cmd)])
            index += cmd
        else:
            raise ApplyDeltaError('Invalid    opcode    0')
    if (index != delta_length):
        raise ApplyDeltaError(('delta    not    empty:    %r' % delta[index:]))
    if (dest_size != chunks_length(out)):
        raise ApplyDeltaError('dest    size    incorrect')
    return out