static int unicode_decomp_entry()

in src/couch_quickjs/quickjs/libunicode.c [824:960]

• 136 lines of code
• 49 McCabe index (conditional complexity)

static int unicode_decomp_entry(uint32_t *res, uint32_t c,
                                int idx, uint32_t code, uint32_t len,
                                uint32_t type)
{
    uint32_t c1;
    int l, i, p;
    const uint8_t *d;

    if (type == DECOMP_TYPE_C1) {
        res[0] = unicode_decomp_table2[idx];
        return 1;
    } else {
        d = unicode_decomp_data + unicode_decomp_table2[idx];
        switch(type) {
        case DECOMP_TYPE_L1:
        case DECOMP_TYPE_L2:
        case DECOMP_TYPE_L3:
        case DECOMP_TYPE_L4:
        case DECOMP_TYPE_L5:
        case DECOMP_TYPE_L6:
        case DECOMP_TYPE_L7:
            l = type - DECOMP_TYPE_L1 + 1;
            d += (c - code) * l * 2;
            for(i = 0; i < l; i++) {
                if ((res[i] = unicode_get16(d + 2 * i)) == 0)
                    return 0;
            }
            return l;
        case DECOMP_TYPE_LL1:
        case DECOMP_TYPE_LL2:
            {
                uint32_t k, p;
                l = type - DECOMP_TYPE_LL1 + 1;
                k = (c - code) * l;
                p = len * l * 2;
                for(i = 0; i < l; i++) {
                    c1 = unicode_get16(d + 2 * k) |
                        (((d[p + (k / 4)] >> ((k % 4) * 2)) & 3) << 16);
                    if (!c1)
                        return 0;
                    res[i] = c1;
                    k++;
                }
            }
            return l;
        case DECOMP_TYPE_S1:
        case DECOMP_TYPE_S2:
        case DECOMP_TYPE_S3:
        case DECOMP_TYPE_S4:
        case DECOMP_TYPE_S5:
            l = type - DECOMP_TYPE_S1 + 1;
            d += (c - code) * l;
            for(i = 0; i < l; i++) {
                if ((res[i] = unicode_get_short_code(d[i])) == 0)
                    return 0;
            }
            return l;
        case DECOMP_TYPE_I1:
            l = 1;
            p = 0;
            goto decomp_type_i;
        case DECOMP_TYPE_I2_0:
        case DECOMP_TYPE_I2_1:
        case DECOMP_TYPE_I3_1:
        case DECOMP_TYPE_I3_2:
        case DECOMP_TYPE_I4_1:
        case DECOMP_TYPE_I4_2:
            l = 2 + ((type - DECOMP_TYPE_I2_0) >> 1);
            p = ((type - DECOMP_TYPE_I2_0) & 1) + (l > 2);
        decomp_type_i:
            for(i = 0; i < l; i++) {
                c1 = unicode_get16(d + 2 * i);
                if (i == p)
                    c1 += c - code;
                res[i] = c1;
            }
            return l;
        case DECOMP_TYPE_B18:
            l = 18;
            goto decomp_type_b;
        case DECOMP_TYPE_B1:
        case DECOMP_TYPE_B2:
        case DECOMP_TYPE_B3:
        case DECOMP_TYPE_B4:
        case DECOMP_TYPE_B5:
        case DECOMP_TYPE_B6:
        case DECOMP_TYPE_B7:
        case DECOMP_TYPE_B8:
            l = type - DECOMP_TYPE_B1 + 1;
        decomp_type_b:
            {
                uint32_t c_min;
                c_min = unicode_get16(d);
                d += 2 + (c - code) * l;
                for(i = 0; i < l; i++) {
                    c1 = d[i];
                    if (c1 == 0xff)
                        c1 = 0x20;
                    else
                        c1 += c_min;
                    res[i] = c1;
                }
            }
            return l;
        case DECOMP_TYPE_LS2:
            d += (c - code) * 3;
            if (!(res[0] = unicode_get16(d)))
                return 0;
            res[1] = unicode_get_short_code(d[2]);
            return 2;
        case DECOMP_TYPE_PAT3:
            res[0] = unicode_get16(d);
            res[2] = unicode_get16(d + 2);
            d += 4 + (c - code) * 2;
            res[1] = unicode_get16(d);
            return 3;
        case DECOMP_TYPE_S2_UL:
        case DECOMP_TYPE_LS2_UL:
            c1 = c - code;
            if (type == DECOMP_TYPE_S2_UL) {
                d += c1 & ~1;
                c = unicode_get_short_code(*d);
                d++;
            } else {
                d += (c1 >> 1) * 3;
                c = unicode_get16(d);
                d += 2;
            }
            if (c1 & 1)
                c = unicode_get_lower_simple(c);
            res[0] = c;
            res[1] = unicode_get_short_code(*d);
            return 2;
        }
    }
    return 0;
}