libmng_zlib.c

奇趣公司比较新的qt/emd版本

          pSrc = pDest + pData->iRowsize - (4*pData->iRowsize+7)/8;
          for (iX = pData->iRowsize; ;)
          {
            *pDest++ = (((*pSrc)>>4)&0x0f);
            if (iX-- <= 0)
              break;
            *pDest++ = (((*pSrc)   )&0x0f);
            if (iX-- <= 0)
              break;
            pSrc++;
          }
        }
        if (pData->iPNGdepth < 8 && pData->iColortype == 0)
        {
          /* Expand samples to 8-bit by LBR */
          mng_int32  iX;
          mng_uint8p pSrc = pData->pWorkrow+1;
          mng_uint8 multiplier[]={0,255,85,0,17,0,0,0,1};

          for (iX = pData->iRowsize; iX > 0; iX--)
              *pSrc++ *= multiplier[pData->iPNGdepth];
        }
#endif
#ifdef MNG_NO_16BIT_SUPPORT
        if (pData->iPNGdepth > 8)
        {
          /* Reduce Workrow to 8-bit */
          mng_int32  iX;
          mng_uint8p pSrc = pData->pWorkrow+1;
          mng_uint8p pDest = pSrc;

          for (iX = pData->iRowsize; iX > 0; iX--)
          {
            *pDest = *pSrc;
            pDest++;
            pSrc+=2;
          }
        }
#endif

#ifdef FILTER192                       /* has leveling info ? */
        if (pData->iFilterofs == MNG_FILTER_DIFFERING)
          iRslt = init_rowdiffering (pData);
        else
#endif
          iRslt = MNG_NOERROR;
                                       /* filter the row if necessary */
        if ((!iRslt) && (pData->iFilterofs < pData->iPixelofs  ) &&
                        (*(pData->pWorkrow + pData->iFilterofs))    )
          iRslt = mng_filter_a_row (pData);
        else
          iRslt = MNG_NOERROR;
                                       /* additional leveling/differing ? */
        if ((!iRslt) && (pData->fDifferrow))
        {
          iRslt = ((mng_differrow)pData->fDifferrow) (pData);

          pSwap           = pData->pWorkrow;
          pData->pWorkrow = pData->pPrevrow;
          pData->pPrevrow = pSwap;     /* make sure we're processing the right data */
        }

        if (!iRslt)
        {
#ifdef MNG_INCLUDE_JNG
          if (pData->bHasJHDR)         /* is JNG alpha-channel ? */
          {                            /* just store in object ? */
            if ((!iRslt) && (pData->fStorerow))
              iRslt = ((mng_storerow)pData->fStorerow)     (pData);
          }
          else
#endif /* MNG_INCLUDE_JNG */
          {                            /* process this row */
            if ((!iRslt) && (pData->fProcessrow))
              iRslt = ((mng_processrow)pData->fProcessrow) (pData);
                                       /* store in object ? */
            if ((!iRslt) && (pData->fStorerow))
              iRslt = ((mng_storerow)pData->fStorerow)     (pData);
                                       /* color correction ? */
            if ((!iRslt) && (pData->fCorrectrow))
              iRslt = ((mng_correctrow)pData->fCorrectrow) (pData);
                                       /* slap onto canvas ? */
            if ((!iRslt) && (pData->fDisplayrow))
            {
              iRslt = ((mng_displayrow)pData->fDisplayrow) (pData);

              if (!iRslt)              /* check progressive display refresh */
                iRslt = mng_display_progressive_check (pData);

            }
          }
        }

        if (iRslt)                     /* on error bail out */
          MNG_ERROR (pData, iRslt);

        if (!pData->fDifferrow)        /* swap row-pointers */
        {
          pSwap           = pData->pWorkrow;
          pData->pWorkrow = pData->pPrevrow;
          pData->pPrevrow = pSwap;     /* so prev points to the processed row! */
        }

        iRslt = mng_next_row (pData);  /* adjust variables for next row */

        if (iRslt)                     /* on error bail out */
          MNG_ERROR (pData, iRslt);
      }
                                       /* let zlib know where to store next output */
      pData->sZlib.next_out  = pData->pWorkrow;
      pData->sZlib.avail_out = (uInt)(pData->iRowsize + pData->iPixelofs);
#ifdef MNG_NO_1_2_4BIT_SUPPORT
    if (pData->iPNGdepth < 8)
       pData->sZlib.avail_out = (uInt)((pData->iPNGdepth*pData->iRowsize + 7)/8
           + pData->iPixelofs);
#endif
#ifdef MNG_NO_16BIT_SUPPORT
      if (pData->iPNGdepth > 8)
        pData->sZlib.avail_out = (uInt)(2*pData->iRowsize + pData->iPixelofs);
#endif
    }
  }                                    /* until some error or EOI
                                          or all pixels received */
  while ( (iZrslt == Z_OK) && (pData->sZlib.avail_in > 0)      &&
          ( (pData->iRow < (mng_int32)pData->iDataheight) ||
            ( (pData->iPass >= 0) && (pData->iPass < 7) )    )    );
                                       /* on error bail out */
  if ((iZrslt != Z_OK) && (iZrslt != Z_STREAM_END))
    MNG_ERRORZ (pData, (mng_uint32)iZrslt);
                                       /* too much data ? */
  if ((iZrslt == Z_OK) && (pData->sZlib.avail_in > 0))
    MNG_WARNING (pData, MNG_TOOMUCHIDAT);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEROWS, MNG_LC_END);
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SUPPORT_DISPLAY */

/* ************************************************************************** */

mng_retcode mngzlib_inflatedata (mng_datap  pData,
                                 mng_uint32 iInlen,
                                 mng_uint8p pIndata)
{
  int iZrslt;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEDATA, MNG_LC_START);
#endif
                                       /* let zlib know where to get stuff */
  pData->sZlib.next_in   = pIndata;
  pData->sZlib.avail_in  = (uInt)iInlen;
                                       /* now inflate the data in one go! */
  iZrslt = inflate (&pData->sZlib, Z_FINISH);
                                       /* not enough room in output-buffer ? */
  if ((iZrslt == Z_BUF_ERROR) || (pData->sZlib.avail_in > 0))
    return MNG_BUFOVERFLOW;
                                       /* on error bail out */
  if ((iZrslt != Z_OK) && (iZrslt != Z_STREAM_END))
    MNG_ERRORZ (pData, (mng_uint32)iZrslt);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEDATA, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mngzlib_inflatefree (mng_datap pData)
{
  int iZrslt;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEFREE, MNG_LC_START);
#endif

  pData->bInflating = MNG_FALSE;       /* stopped it */

  iZrslt = inflateEnd (&pData->sZlib); /* let zlib cleanup its own stuff */

  if (iZrslt != Z_OK)                  /* on error bail out */
    MNG_ERRORZ (pData, (mng_uint32)iZrslt);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEFREE, MNG_LC_END);
#endif

  return MNG_NOERROR;                  /* done */
}

/* ************************************************************************** */

mng_retcode mngzlib_deflateinit (mng_datap pData)
{
  int iZrslt;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEINIT, MNG_LC_START);
#endif
                                       /* initialize zlib structures and such */
  iZrslt = deflateInit2 (&pData->sZlib, pData->iZlevel, pData->iZmethod,
                         pData->iZwindowbits, pData->iZmemlevel,
                         pData->iZstrategy);

  if (iZrslt != Z_OK)                  /* on error bail out */
    MNG_ERRORZ (pData, (mng_uint32)iZrslt);

  pData->bDeflating = MNG_TRUE;        /* really deflating something now */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEINIT, MNG_LC_END);
#endif

  return MNG_NOERROR;                  /* done */
}

/* ************************************************************************** */

mng_retcode mngzlib_deflaterows (mng_datap  pData,
                                 mng_uint32 iInlen,
                                 mng_uint8p pIndata)
{
#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEROWS, MNG_LC_START);
#endif




#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEROWS, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mngzlib_deflatedata (mng_datap  pData,
                                 mng_uint32 iInlen,
                                 mng_uint8p pIndata)
{
  int iZrslt;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEDATA, MNG_LC_START);
#endif

  pData->sZlib.next_in  = pIndata;     /* let zlib know where to get stuff */
  pData->sZlib.avail_in = (uInt)iInlen;
                                       /* now deflate the data in one go! */
  iZrslt = deflate (&pData->sZlib, Z_FINISH);
                                       /* not enough room in output-buffer ? */
  if ((iZrslt == Z_BUF_ERROR) || (pData->sZlib.avail_in > 0))
    return MNG_BUFOVERFLOW;
                                       /* on error bail out */
  if ((iZrslt != Z_OK) && (iZrslt != Z_STREAM_END))
    MNG_ERRORZ (pData, (mng_uint32)iZrslt);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEDATA, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode mngzlib_deflatefree (mng_datap pData)
{
  int iZrslt;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEFREE, MNG_LC_START);
#endif

  iZrslt = deflateEnd (&pData->sZlib); /* let zlib cleanup it's own stuff */

  if (iZrslt != Z_OK)                  /* on error bail out */
    MNG_ERRORZ (pData, (mng_uint32)iZrslt);

  pData->bDeflating = MNG_FALSE;       /* stopped it */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEFREE, MNG_LC_END);
#endif

  return MNG_NOERROR;                  /* done */
}

/* ************************************************************************** */

#endif /* MNG_INCLUDE_ZLIB */

/* ************************************************************************** */
/* * end of file                                                            * */
/* ************************************************************************** */