tdefl_status tdefl_compress()

in windows/CodePush/miniz/miniz.c [1877:1943]

• 60 lines of code
• 34 McCabe index (conditional complexity)

tdefl_status tdefl_compress(tdefl_compressor *d, const void *pIn_buf, size_t *pIn_buf_size, void *pOut_buf, size_t *pOut_buf_size, tdefl_flush flush)
{
    if (!d)
    {
        if (pIn_buf_size)
            *pIn_buf_size = 0;
        if (pOut_buf_size)
            *pOut_buf_size = 0;
        return TDEFL_STATUS_BAD_PARAM;
    }

    d->m_pIn_buf = pIn_buf;
    d->m_pIn_buf_size = pIn_buf_size;
    d->m_pOut_buf = pOut_buf;
    d->m_pOut_buf_size = pOut_buf_size;
    d->m_pSrc = (const mz_uint8 *)(pIn_buf);
    d->m_src_buf_left = pIn_buf_size ? *pIn_buf_size : 0;
    d->m_out_buf_ofs = 0;
    d->m_flush = flush;

    if (((d->m_pPut_buf_func != NULL) == ((pOut_buf != NULL) || (pOut_buf_size != NULL))) || (d->m_prev_return_status != TDEFL_STATUS_OKAY) ||
        (d->m_wants_to_finish && (flush != TDEFL_FINISH)) || (pIn_buf_size && *pIn_buf_size && !pIn_buf) || (pOut_buf_size && *pOut_buf_size && !pOut_buf))
    {
        if (pIn_buf_size)
            *pIn_buf_size = 0;
        if (pOut_buf_size)
            *pOut_buf_size = 0;
        return (d->m_prev_return_status = TDEFL_STATUS_BAD_PARAM);
    }
    d->m_wants_to_finish |= (flush == TDEFL_FINISH);

    if ((d->m_output_flush_remaining) || (d->m_finished))
        return (d->m_prev_return_status = tdefl_flush_output_buffer(d));

#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN
    if (((d->m_flags & TDEFL_MAX_PROBES_MASK) == 1) &&
        ((d->m_flags & TDEFL_GREEDY_PARSING_FLAG) != 0) &&
        ((d->m_flags & (TDEFL_FILTER_MATCHES | TDEFL_FORCE_ALL_RAW_BLOCKS | TDEFL_RLE_MATCHES)) == 0))
    {
        if (!tdefl_compress_fast(d))
            return d->m_prev_return_status;
    }
    else
#endif /* #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN */
    {
        if (!tdefl_compress_normal(d))
            return d->m_prev_return_status;
    }

    if ((d->m_flags & (TDEFL_WRITE_ZLIB_HEADER | TDEFL_COMPUTE_ADLER32)) && (pIn_buf))
        d->m_adler32 = (mz_uint32)mz_adler32(d->m_adler32, (const mz_uint8 *)pIn_buf, d->m_pSrc - (const mz_uint8 *)pIn_buf);

    if ((flush) && (!d->m_lookahead_size) && (!d->m_src_buf_left) && (!d->m_output_flush_remaining))
    {
        if (tdefl_flush_block(d, flush) < 0)
            return d->m_prev_return_status;
        d->m_finished = (flush == TDEFL_FINISH);
        if (flush == TDEFL_FULL_FLUSH)
        {
            MZ_CLEAR_OBJ(d->m_hash);
            MZ_CLEAR_OBJ(d->m_next);
            d->m_dict_size = 0;
        }
    }

    return (d->m_prev_return_status = tdefl_flush_output_buffer(d));
}