Function decode_sequence

encoding/encoding.c:674–703

static int decode_sequence(const unsigned char *coded, unsigned char *plain) {
    ENCODING_LOG("[decode_sequence] Starting sequence decoding");

    assert(CHAR_BIT == 8);
    assert(coded && plain);

    plain[0] = 0;
    for (int block = 0; block < 8; block++) {
        int offset = get_offset(block);
        int octet = get_octet(block);

        ENCODING_LOG("[decode_sequence] Decoding block %d, offset: %d, octet: %d", block, offset, octet);

        int c = decode_char(coded[block]);
        if (c < 0) {
            ENCODING_LOG("[decode_sequence] Invalid character at block %d", block);
            return octet;
        }

        plain[octet] |= shift_left(c, offset);
        if (offset < 0) {
            assert(octet < 4);
            plain[octet + 1] = shift_left(c, 8 + offset);
            ENCODING_LOG("[decode_sequence] Block overflows to next octet.");
        }
    }

    ENCODING_LOG("[decode_sequence] Decoding completed successfully");
    return 5;
}


/**