int mz_inflate()

in windows/CodePush/miniz/miniz.c [426:536]
93 lines of code
33 McCabe index (conditional complexity)

int mz_inflate(mz_streamp pStream, int flush)
{
    inflate_state *pState;
    mz_uint n, first_call, decomp_flags = TINFL_FLAG_COMPUTE_ADLER32;
    size_t in_bytes, out_bytes, orig_avail_in;
    tinfl_status status;

    if ((!pStream) || (!pStream->state))
        return MZ_STREAM_ERROR;
    if (flush == MZ_PARTIAL_FLUSH)
        flush = MZ_SYNC_FLUSH;
    if ((flush) && (flush != MZ_SYNC_FLUSH) && (flush != MZ_FINISH))
        return MZ_STREAM_ERROR;

    pState = (inflate_state *)pStream->state;
    if (pState->m_window_bits > 0)
        decomp_flags |= TINFL_FLAG_PARSE_ZLIB_HEADER;
    orig_avail_in = pStream->avail_in;

    first_call = pState->m_first_call;
    pState->m_first_call = 0;
    if (pState->m_last_status < 0)
        return MZ_DATA_ERROR;

    if (pState->m_has_flushed && (flush != MZ_FINISH))
        return MZ_STREAM_ERROR;
    pState->m_has_flushed |= (flush == MZ_FINISH);

    if ((flush == MZ_FINISH) && (first_call))
    {
        /* MZ_FINISH on the first call implies that the input and output buffers are large enough to hold the entire compressed/decompressed file. */
        decomp_flags |= TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF;
        in_bytes = pStream->avail_in;
        out_bytes = pStream->avail_out;
        status = tinfl_decompress(&pState->m_decomp, pStream->next_in, &in_bytes, pStream->next_out, pStream->next_out, &out_bytes, decomp_flags);
        pState->m_last_status = status;
        pStream->next_in += (mz_uint)in_bytes;
        pStream->avail_in -= (mz_uint)in_bytes;
        pStream->total_in += (mz_uint)in_bytes;
        pStream->adler = tinfl_get_adler32(&pState->m_decomp);
        pStream->next_out += (mz_uint)out_bytes;
        pStream->avail_out -= (mz_uint)out_bytes;
        pStream->total_out += (mz_uint)out_bytes;

        if (status < 0)
            return MZ_DATA_ERROR;
        else if (status != TINFL_STATUS_DONE)
        {
            pState->m_last_status = TINFL_STATUS_FAILED;
            return MZ_BUF_ERROR;
        }
        return MZ_STREAM_END;
    }
    /* flush != MZ_FINISH then we must assume there's more input. */
    if (flush != MZ_FINISH)
        decomp_flags |= TINFL_FLAG_HAS_MORE_INPUT;

    if (pState->m_dict_avail)
    {
        n = MZ_MIN(pState->m_dict_avail, pStream->avail_out);
        memcpy(pStream->next_out, pState->m_dict + pState->m_dict_ofs, n);
        pStream->next_out += n;
        pStream->avail_out -= n;
        pStream->total_out += n;
        pState->m_dict_avail -= n;
        pState->m_dict_ofs = (pState->m_dict_ofs + n) & (TINFL_LZ_DICT_SIZE - 1);
        return ((pState->m_last_status == TINFL_STATUS_DONE) && (!pState->m_dict_avail)) ? MZ_STREAM_END : MZ_OK;
    }

    for (;;)
    {
        in_bytes = pStream->avail_in;
        out_bytes = TINFL_LZ_DICT_SIZE - pState->m_dict_ofs;

        status = tinfl_decompress(&pState->m_decomp, pStream->next_in, &in_bytes, pState->m_dict, pState->m_dict + pState->m_dict_ofs, &out_bytes, decomp_flags);
        pState->m_last_status = status;

        pStream->next_in += (mz_uint)in_bytes;
        pStream->avail_in -= (mz_uint)in_bytes;
        pStream->total_in += (mz_uint)in_bytes;
        pStream->adler = tinfl_get_adler32(&pState->m_decomp);

        pState->m_dict_avail = (mz_uint)out_bytes;

        n = MZ_MIN(pState->m_dict_avail, pStream->avail_out);
        memcpy(pStream->next_out, pState->m_dict + pState->m_dict_ofs, n);
        pStream->next_out += n;
        pStream->avail_out -= n;
        pStream->total_out += n;
        pState->m_dict_avail -= n;
        pState->m_dict_ofs = (pState->m_dict_ofs + n) & (TINFL_LZ_DICT_SIZE - 1);

        if (status < 0)
            return MZ_DATA_ERROR; /* Stream is corrupted (there could be some uncompressed data left in the output dictionary - oh well). */
        else if ((status == TINFL_STATUS_NEEDS_MORE_INPUT) && (!orig_avail_in))
            return MZ_BUF_ERROR; /* Signal caller that we can't make forward progress without supplying more input or by setting flush to MZ_FINISH. */
        else if (flush == MZ_FINISH)
        {
            /* The output buffer MUST be large to hold the remaining uncompressed data when flush==MZ_FINISH. */
            if (status == TINFL_STATUS_DONE)
                return pState->m_dict_avail ? MZ_BUF_ERROR : MZ_STREAM_END;
            /* status here must be TINFL_STATUS_HAS_MORE_OUTPUT, which means there's at least 1 more byte on the way. If there's no more room left in the output buffer then something is wrong. */
            else if (!pStream->avail_out)
                return MZ_BUF_ERROR;
        }
        else if ((status == TINFL_STATUS_DONE) || (!pStream->avail_in) || (!pStream->avail_out) || (pState->m_dict_avail))
            break;
    }

    return ((status == TINFL_STATUS_DONE) && (!pState->m_dict_avail)) ? MZ_STREAM_END : MZ_OK;
}