Function ls_get_code_runterm

libavcodec/jpeglsdec.c:184–227

* Get Golomb code, decode it and update state for run termination */

 * Get Golomb code, decode it and update state for run termination
 */
static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
                                      int RItype, int limit_add)
{
    int k, ret, temp, map;
    int Q = 365 + RItype;

    temp = state->A[Q];
    if (RItype)
        temp += state->N[Q] >> 1;

    for (k = 0; ((unsigned)state->N[Q] << k) < temp; k++)
        ;

#ifdef JLS_BROKEN
    if (!show_bits_long(gb, 32))
        return -1;
#endif
    ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1,
                               state->qbpp);
    if (ret < 0)
        return -0x10000;

    /* decode mapped error */
    map = 0;
    if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
        map = 1;
    ret += RItype + map;

    if (ret & 1) {
        ret = map - (ret + 1 >> 1);
        state->B[Q]++;
    } else {
        ret = ret >> 1;
    }

    if (FFABS(ret) > 0xFFFF)
        return -0x10000;
    /* update state */
    state->A[Q] += FFABS(ret) - RItype;
    ret         *= state->twonear;
    ff_jpegls_downscale_state(state, Q);

    return ret;
}

/**
 * Decode one line of image