Test conversion to TQt3 from Qt3 8c6fc1f8e35fd264dd01c582ca5e7549b32ab731

1 files changed, 696 insertions, 0 deletions

diff --git a/src/3rdparty/libmng/libmng_read.c b/src/3rdparty/libmng/libmng_read.c
new file mode 100644
index 000000000..d4fb2d1a5
--- /dev/null
+++ b/src/3rdparty/libmng/libmng_read.c
@@ -0,0 +1,696 @@
+/* ************************************************************************** */
+/* *             For conditions of distribution and use,                    * */
+/* *                see copyright notice in libmng.h                        * */
+/* ************************************************************************** */
+/* *                                                                        * */
+/* * project   : libmng                                                     * */
+/* * file      : libmng_read.c             copyright (c) 2000 G.Juyn        * */
+/* * version   : 1.0.4                                                      * */
+/* *                                                                        * */
+/* * purpose   : Read logic (implementation)                                * */
+/* *                                                                        * */
+/* * author    : G.Juyn                                                     * */
+/* * web       : http://www.3-t.com                                         * */
+/* * email     : mailto:info@3-t.com                                        * */
+/* *                                                                        * */
+/* * comment   : implementation of the high-level read logic                * */
+/* *                                                                        * */
+/* * changes   : 0.5.1 - 05/08/2000 - G.Juyn                                * */
+/* *             - changed strict-ANSI stuff                                * */
+/* *             0.5.1 - 05/11/2000 - G.Juyn                                * */
+/* *             - added callback error-reporting support                   * */
+/* *             0.5.1 - 05/12/2000 - G.Juyn                                * */
+/* *             - changed trace to macro for callback error-reporting      * */
+/* *                                                                        * */
+/* *             0.5.2 - 05/19/2000 - G.Juyn                                * */
+/* *             - cleaned up some code regarding mixed support             * */
+/* *             0.5.2 - 05/20/2000 - G.Juyn                                * */
+/* *             - added support for JNG                                    * */
+/* *             0.5.2 - 05/31/2000 - G.Juyn                                * */
+/* *             - fixed up punctuation (contribution by Tim Rowley)        * */
+/* *                                                                        * */
+/* *             0.5.3 - 06/16/2000 - G.Juyn                                * */
+/* *             - changed progressive-display processing                   * */
+/* *                                                                        * */
+/* *             0.9.1 - 07/08/2000 - G.Juyn                                * */
+/* *             - changed read-processing for improved I/O-suspension      * */
+/* *             0.9.1 - 07/14/2000 - G.Juyn                                * */
+/* *             - changed EOF processing behavior                          * */
+/* *             0.9.1 - 07/14/2000 - G.Juyn                                * */
+/* *             - changed default readbuffer size from 1024 to 4200        * */
+/* *                                                                        * */
+/* *             0.9.2 - 07/27/2000 - G.Juyn                                * */
+/* *             - B110320 - fixed GCC warning about mix-sized pointer math * */
+/* *             0.9.2 - 07/31/2000 - G.Juyn                                * */
+/* *             - B110546 - fixed for improperly returning UNEXPECTEDEOF   * */
+/* *             0.9.2 - 08/04/2000 - G.Juyn                                * */
+/* *             - B111096 - fixed large-buffer read-suspension             * */
+/* *             0.9.2 - 08/05/2000 - G.Juyn                                * */
+/* *             - changed file-prefixes                                    * */
+/* *                                                                        * */
+/* *             0.9.3 - 08/26/2000 - G.Juyn                                * */
+/* *             - added MAGN chunk                                         * */
+/* *             0.9.3 - 10/11/2000 - G.Juyn                                * */
+/* *             - removed test-MaGN                                        * */
+/* *             0.9.3 - 10/16/2000 - G.Juyn                                * */
+/* *             - added support for JDAA                                   * */
+/* *                                                                        * */
+/* *             0.9.5 - 01/23/2001 - G.Juyn                                * */
+/* *             - fixed timing-problem with switching framing_modes        * */
+/* *                                                                        * */
+/* *             1.0.4 - 06/22/2002 - G.Juyn                                * */
+/* *             - B495443 - incorrect suspend check in read_databuffer     * */
+/* *                                                                        * */
+/* ************************************************************************** */
+
+#include "libmng.h"
+#include "libmng_data.h"
+#include "libmng_error.h"
+#include "libmng_trace.h"
+#ifdef __BORLANDC__
+#pragma hdrstop
+#endif
+#include "libmng_memory.h"
+#include "libmng_objects.h"
+#include "libmng_object_prc.h"
+#include "libmng_chunks.h"
+#include "libmng_chunk_prc.h"
+#include "libmng_chunk_io.h"
+#include "libmng_display.h"
+#include "libmng_read.h"
+
+#if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI)
+#pragma option -A                      /* force ANSI-C */
+#endif
+
+/* ************************************************************************** */
+
+#ifdef MNG_INCLUDE_READ_PROCS
+
+/* ************************************************************************** */
+
+mng_retcode process_eof (mng_datap pData)
+{
+  if (!pData->bEOF)                    /* haven't closed the stream yet ? */
+  {
+    pData->bEOF = MNG_TRUE;            /* now we do! */
+
+    if (!pData->fClosestream ((mng_handle)pData))
+      MNG_ERROR (pData, MNG_APPIOERROR)
+  }
+
+  return MNG_NOERROR;
+}
+
+/* ************************************************************************** */
+
+mng_retcode read_databuffer (mng_datap    pData,
+                             mng_uint8p   pBuf,
+                             mng_uint32   iSize,
+                             mng_uint32 * iRead)
+{
+#ifdef MNG_SUPPORT_TRACE
+  MNG_TRACE (pData, MNG_FN_READ_DATABUFFER, MNG_LC_START)
+#endif
+
+  if (pData->bSuspensionmode)
+  {
+    mng_uint8p pTemp;
+    mng_uint32 iTemp;
+
+    *iRead = 0;                        /* let's be negative about the outcome */
+
+    if (!pData->pSuspendbuf)           /* need to create a suspension buffer ? */
+    {
+      pData->iSuspendbufsize = MNG_SUSPENDBUFFERSIZE;
+                                       /* so, create it */
+      MNG_ALLOC (pData, pData->pSuspendbuf, pData->iSuspendbufsize)
+
+      pData->iSuspendbufleft = 0;      /* make sure to fill it first time */
+      pData->pSuspendbufnext = pData->pSuspendbuf;
+    }
+                                       /* more than our buffer can hold ? */
+    if (iSize > pData->iSuspendbufsize)
+    {
+      mng_uint32 iRemain;
+
+      if (!pData->pReadbufnext)        /* first time ? */
+      {
+        if (pData->iSuspendbufleft)    /* do we have some data left ? */
+        {                              /* then copy it */
+          MNG_COPY (pBuf, pData->pSuspendbufnext, pData->iSuspendbufleft)
+                                       /* fixup variables */
+          pData->pReadbufnext    = pBuf + pData->iSuspendbufleft;
+          pData->pSuspendbufnext = pData->pSuspendbuf;
+          pData->iSuspendbufleft = 0;
+        }
+        else
+        {
+          pData->pReadbufnext    = pBuf;
+        }
+      }
+                                       /* calculate how much to get */
+      iRemain = iSize - (mng_uint32)(pData->pReadbufnext - pBuf);
+                                       /* let's go get it */
+      if (!pData->fReaddata (((mng_handle)pData), pData->pReadbufnext, iRemain, &iTemp))
+        MNG_ERROR (pData, MNG_APPIOERROR);
+                                       /* first read after suspension return 0 means EOF */
+      if ((pData->iSuspendpoint) && (iTemp == 0))
+      {                                /* that makes it final */
+        mng_retcode iRetcode = process_eof (pData);
+
+        if (iRetcode)                  /* on error bail out */
+          return iRetcode;
+                                       /* indicate the source is depleted */
+        *iRead = iSize - iRemain + iTemp;
+      }
+      else
+      {
+        if (iTemp < iRemain)           /* suspension retquired ? */
+        {
+          pData->pReadbufnext = pData->pReadbufnext + iTemp;
+          pData->bSuspended   = MNG_TRUE;
+        }
+        else
+        {
+          *iRead = iSize;              /* got it all now ! */
+        }
+      }
+    }
+    else
+    {                                  /* need to read some more ? */
+      while ((!pData->bSuspended) && (!pData->bEOF) && (iSize > pData->iSuspendbufleft))
+      {                                /* not enough space left in buffer ? */
+        if (pData->iSuspendbufsize - pData->iSuspendbufleft -
+            (mng_uint32)(pData->pSuspendbufnext - pData->pSuspendbuf) <
+                                                          MNG_SUSPENDRETQUESTSIZE)
+        {
+          if (pData->iSuspendbufleft)  /* then lets shift (if there's anything left) */
+            MNG_COPY (pData->pSuspendbuf, pData->pSuspendbufnext, pData->iSuspendbufleft)
+                                       /* adjust running pointer */
+          pData->pSuspendbufnext = pData->pSuspendbuf;
+        }
+                                       /* still not enough room ? */
+        if (pData->iSuspendbufsize - pData->iSuspendbufleft < MNG_SUSPENDRETQUESTSIZE)
+          MNG_ERROR (pData, MNG_INTERNALERROR)
+                                       /* now read some more data */
+        pTemp = pData->pSuspendbufnext + pData->iSuspendbufleft;
+
+        if (!pData->fReaddata (((mng_handle)pData), pTemp, MNG_SUSPENDRETQUESTSIZE, &iTemp))
+          MNG_ERROR (pData, MNG_APPIOERROR);
+                                       /* adjust fill-counter */
+        pData->iSuspendbufleft += iTemp;
+                                       /* first read after suspension returning 0 means EOF */
+        if ((pData->iSuspendpoint) && (iTemp == 0))
+        {                              /* that makes it final */
+          mng_retcode iRetcode = process_eof (pData);
+
+          if (iRetcode)                /* on error bail out */
+            return iRetcode;
+
+          if (pData->iSuspendbufleft)  /* return the leftover scraps */
+            MNG_COPY (pBuf, pData->pSuspendbufnext, pData->iSuspendbufleft)
+                                       /* and indicate so */
+          *iRead = pData->iSuspendbufleft;
+          pData->pSuspendbufnext = pData->pSuspendbuf;
+          pData->iSuspendbufleft = 0;
+        }
+        else
+        {                              /* suspension retquired ? */
+          if ((iSize > pData->iSuspendbufleft) && (iTemp < MNG_SUSPENDRETQUESTSIZE))
+            pData->bSuspended = MNG_TRUE;
+
+        }
+
+        pData->iSuspendpoint = 0;      /* reset it here in case we loop back */ 
+      }
+
+      if ((!pData->bSuspended) && (!pData->bEOF))
+      {                                /* return the data ! */
+        MNG_COPY (pBuf, pData->pSuspendbufnext, iSize)
+
+        *iRead = iSize;                /* returned it all */
+                                       /* adjust suspension-buffer variables */
+        pData->pSuspendbufnext += iSize;
+        pData->iSuspendbufleft -= iSize;
+      }
+    }
+  }
+  else
+  {
+    if (!pData->fReaddata (((mng_handle)pData), (mng_ptr)pBuf, iSize, iRead))
+    {
+      if (*iRead == 0)                 /* suspension retquired ? */
+        pData->bSuspended = MNG_TRUE;
+      else
+        MNG_ERROR (pData, MNG_APPIOERROR);
+    }
+  }
+
+  pData->iSuspendpoint = 0;            /* safely reset it here ! */
+
+#ifdef MNG_SUPPORT_TRACE
+  MNG_TRACE (pData, MNG_FN_READ_DATABUFFER, MNG_LC_END)
+#endif
+
+  return MNG_NOERROR;
+}
+
+/* ************************************************************************** */
+
+mng_retcode process_raw_chunk (mng_datap  pData,
+                               mng_uint8p pBuf,
+                               mng_uint32 iBuflen)
+{
+  /* the table-idea & binary search code was adapted from
+     libpng 1.1.0 (pngread.c) */
+  /* NOTE1: the table must remain sorted by chunkname, otherwise the binary
+     search will break !!! */
+  /* NOTE2: the layout must remain equal to the header part of all the
+     chunk-structures (yes, that means even the pNext and pPrev fields;
+     it's wasting a bit of space, but hey, the code is a lot easier) */
+
+  mng_chunk_header chunk_unknown = {MNG_UINT_HUH, init_unknown, free_unknown,
+                                    read_unknown, write_unknown, 0, 0};
+
+  mng_chunk_header chunk_table [] =
+  {
+    {MNG_UINT_BACK, init_back, free_back, read_back, write_back, 0, 0},
+    {MNG_UINT_BASI, init_basi, free_basi, read_basi, write_basi, 0, 0},
+    {MNG_UINT_CLIP, init_clip, free_clip, read_clip, write_clip, 0, 0},
+    {MNG_UINT_CLON, init_clon, free_clon, read_clon, write_clon, 0, 0},
+    {MNG_UINT_DBYK, init_dbyk, free_dbyk, read_dbyk, write_dbyk, 0, 0},
+    {MNG_UINT_DEFI, init_defi, free_defi, read_defi, write_defi, 0, 0},
+    {MNG_UINT_DHDR, init_dhdr, free_dhdr, read_dhdr, write_dhdr, 0, 0},
+    {MNG_UINT_DISC, init_disc, free_disc, read_disc, write_disc, 0, 0},
+    {MNG_UINT_DROP, init_drop, free_drop, read_drop, write_drop, 0, 0},
+    {MNG_UINT_ENDL, init_endl, free_endl, read_endl, write_endl, 0, 0},
+    {MNG_UINT_FRAM, init_fram, free_fram, read_fram, write_fram, 0, 0},
+    {MNG_UINT_IDAT, init_idat, free_idat, read_idat, write_idat, 0, 0},  /* 12-th element! */
+    {MNG_UINT_IEND, init_iend, free_iend, read_iend, write_iend, 0, 0},
+    {MNG_UINT_IHDR, init_ihdr, free_ihdr, read_ihdr, write_ihdr, 0, 0},
+    {MNG_UINT_IJNG, init_ijng, free_ijng, read_ijng, write_ijng, 0, 0},
+    {MNG_UINT_IPNG, init_ipng, free_ipng, read_ipng, write_ipng, 0, 0},
+#ifdef MNG_INCLUDE_JNG
+    {MNG_UINT_JDAA, init_jdaa, free_jdaa, read_jdaa, write_jdaa, 0, 0},
+    {MNG_UINT_JDAT, init_jdat, free_jdat, read_jdat, write_jdat, 0, 0},
+    {MNG_UINT_JHDR, init_jhdr, free_jhdr, read_jhdr, write_jhdr, 0, 0},
+    {MNG_UINT_JSEP, init_jsep, free_jsep, read_jsep, write_jsep, 0, 0},
+    {MNG_UINT_JdAA, init_jdaa, free_jdaa, read_jdaa, write_jdaa, 0, 0},
+#endif
+    {MNG_UINT_LOOP, init_loop, free_loop, read_loop, write_loop, 0, 0},
+    {MNG_UINT_MAGN, init_magn, free_magn, read_magn, write_magn, 0, 0},
+    {MNG_UINT_MEND, init_mend, free_mend, read_mend, write_mend, 0, 0},
+    {MNG_UINT_MHDR, init_mhdr, free_mhdr, read_mhdr, write_mhdr, 0, 0},
+    {MNG_UINT_MOVE, init_move, free_move, read_move, write_move, 0, 0},
+    {MNG_UINT_ORDR, init_ordr, free_ordr, read_ordr, write_ordr, 0, 0},
+    {MNG_UINT_PAST, init_past, free_past, read_past, write_past, 0, 0},
+    {MNG_UINT_PLTE, init_plte, free_plte, read_plte, write_plte, 0, 0},
+    {MNG_UINT_PPLT, init_pplt, free_pplt, read_pplt, write_pplt, 0, 0},
+    {MNG_UINT_PROM, init_prom, free_prom, read_prom, write_prom, 0, 0},
+    {MNG_UINT_SAVE, init_save, free_save, read_save, write_save, 0, 0},
+    {MNG_UINT_SEEK, init_seek, free_seek, read_seek, write_seek, 0, 0},
+    {MNG_UINT_SHOW, init_show, free_show, read_show, write_show, 0, 0},
+    {MNG_UINT_TERM, init_term, free_term, read_term, write_term, 0, 0},
+    {MNG_UINT_bKGD, init_bkgd, free_bkgd, read_bkgd, write_bkgd, 0, 0},
+    {MNG_UINT_cHRM, init_chrm, free_chrm, read_chrm, write_chrm, 0, 0},
+    {MNG_UINT_eXPI, init_expi, free_expi, read_expi, write_expi, 0, 0},
+    {MNG_UINT_fPRI, init_fpri, free_fpri, read_fpri, write_fpri, 0, 0},
+    {MNG_UINT_gAMA, init_gama, free_gama, read_gama, write_gama, 0, 0},
+    {MNG_UINT_hIST, init_hist, free_hist, read_hist, write_hist, 0, 0},
+    {MNG_UINT_iCCP, init_iccp, free_iccp, read_iccp, write_iccp, 0, 0},
+    {MNG_UINT_iTXt, init_itxt, free_itxt, read_itxt, write_itxt, 0, 0},
+    {MNG_UINT_nEED, init_need, free_need, read_need, write_need, 0, 0},
+/* TODO:     {MNG_UINT_oFFs, 0, 0, 0, 0, 0, 0},  */
+/* TODO:     {MNG_UINT_pCAL, 0, 0, 0, 0, 0, 0},  */
+    {MNG_UINT_pHYg, init_phyg, free_phyg, read_phyg, write_phyg, 0, 0},
+    {MNG_UINT_pHYs, init_phys, free_phys, read_phys, write_phys, 0, 0},
+    {MNG_UINT_sBIT, init_sbit, free_sbit, read_sbit, write_sbit, 0, 0},
+/* TODO:     {MNG_UINT_sCAL, 0, 0, 0, 0, 0, 0},  */
+    {MNG_UINT_sPLT, init_splt, free_splt, read_splt, write_splt, 0, 0},
+    {MNG_UINT_sRGB, init_srgb, free_srgb, read_srgb, write_srgb, 0, 0},
+    {MNG_UINT_tEXt, init_text, free_text, read_text, write_text, 0, 0},
+    {MNG_UINT_tIME, init_time, free_time, read_time, write_time, 0, 0},
+    {MNG_UINT_tRNS, init_trns, free_trns, read_trns, write_trns, 0, 0},
+    {MNG_UINT_zTXt, init_ztxt, free_ztxt, read_ztxt, write_ztxt, 0, 0},
+  };
+                                       /* binary search variables */
+  mng_int32         iTop, iLower, iUpper, iMiddle;
+  mng_chunk_headerp pEntry;            /* pointer to found entry */
+  mng_chunkid       iChunkname;        /* the chunk's tag */
+  mng_chunkp        pChunk;            /* chunk structure (if #define MNG_STORE_CHUNKS) */
+  mng_retcode       iRetcode;          /* temporary error-code */
+
+#ifdef MNG_SUPPORT_TRACE
+  MNG_TRACE (pData, MNG_FN_PROCESS_RAW_CHUNK, MNG_LC_START)
+#endif
+                                       /* get the chunkname */
+  iChunkname = (mng_chunkid)(mng_get_uint32 (pBuf));
+
+  pBuf += sizeof (mng_chunkid);        /* adjust the buffer */
+  iBuflen -= sizeof (mng_chunkid);
+                                       /* determine max index of table */
+  iTop = (sizeof (chunk_table) / sizeof (chunk_table [0])) - 1;
+
+  /* binary search; with 52 chunks, worst-case is 7 comparisons */
+  iLower  = 0;
+  iMiddle = 11;                        /* start with the IDAT entry */
+  iUpper  = iTop;
+  pEntry  = 0;                         /* no goods yet! */
+  pChunk  = 0;
+
+  do                                   /* the binary search itself */
+    {
+      if (chunk_table [iMiddle].iChunkname < iChunkname)
+        iLower = iMiddle + 1;
+      else if (chunk_table [iMiddle].iChunkname > iChunkname)
+        iUpper = iMiddle - 1;
+      else
+      {
+        pEntry = &chunk_table [iMiddle];
+        break;
+      }
+
+      iMiddle = (iLower + iUpper) >> 1;
+    }
+  while (iLower <= iUpper);
+
+  if (!pEntry)                         /* unknown chunk ? */
+    pEntry = &chunk_unknown;           /* make it so! */
+
+  pData->iChunkname = iChunkname;      /* keep track of where we are */
+  pData->iChunkseq++;
+
+  if (pEntry->fRead)                   /* read-callback available ? */
+  {
+    iRetcode = pEntry->fRead (pData, pEntry, iBuflen, (mng_ptr)pBuf, &pChunk);
+
+    if (!iRetcode)                     /* everything oke ? */
+    {                                  /* remember unknown chunk's id */
+      if ((pChunk) && (pEntry == &chunk_unknown))
+        ((mng_chunk_headerp)pChunk)->iChunkname = iChunkname;
+    }
+  }
+  else
+    iRetcode = MNG_NOERROR;
+
+  if (pChunk)                          /* store this chunk ? */
+    add_chunk (pData, pChunk);         /* do it */
+
+#ifdef MNG_INCLUDE_JNG                 /* implicit EOF ? */
+  if ((!pData->bHasMHDR) && (!pData->bHasIHDR) && (!pData->bHasJHDR))
+#else
+  if ((!pData->bHasMHDR) && (!pData->bHasIHDR))
+#endif
+    iRetcode = process_eof (pData);    /* then do some EOF processing */
+
+  if (iRetcode)                        /* on error bail out */
+    return iRetcode;
+
+#ifdef MNG_SUPPORT_TRACE
+  MNG_TRACE (pData, MNG_FN_PROCESS_RAW_CHUNK, MNG_LC_END)
+#endif
+
+  return MNG_NOERROR;
+}
+
+/* ************************************************************************** */
+
+mng_retcode read_chunk (mng_datap  pData)
+{
+  mng_uint32  iBufmax   = pData->iReadbufsize;
+  mng_uint8p  pBuf      = pData->pReadbuf;
+  mng_uint32  iBuflen   = 0;           /* number of bytes requested */
+  mng_uint32  iRead     = 0;           /* number of bytes read */
+  mng_uint32  iCrc;                    /* calculated CRC */
+  mng_retcode iRetcode  = MNG_NOERROR;
+
+#ifdef MNG_SUPPORT_TRACE
+  MNG_TRACE (pData, MNG_FN_READ_CHUNK, MNG_LC_START)
+#endif
+
+#ifdef MNG_SUPPORT_DISPLAY
+  if (pData->pCurraniobj)              /* processing an animation object ? */
+  {
+    do                                 /* process it then */
+    {
+      iRetcode = ((mng_object_headerp)pData->pCurraniobj)->fProcess (pData, pData->pCurraniobj);
+                                       /* refresh needed ? */
+/*      if ((!iRetcode) && (!pData->bTimerset) && (pData->bNeedrefresh))
+        iRetcode = display_progressive_refresh (pData, 1); */
+                                       /* can we advance to next object ? */
+      if ((!iRetcode) && (pData->pCurraniobj) &&
+          (!pData->bTimerset) && (!pData->bSectionwait))
+      {
+        pData->pCurraniobj = ((mng_object_headerp)pData->pCurraniobj)->pNext;
+                                       /* TERM processing to be done ? */
+        if ((!pData->pCurraniobj) && (pData->bHasTERM) && (!pData->bHasMHDR))
+          iRetcode = process_display_mend (pData);
+      }
+    }                                  /* until error or a break or no more objects */
+    while ((!iRetcode) && (pData->pCurraniobj) &&
+           (!pData->bTimerset) && (!pData->bSectionwait) && (!pData->bFreezing));
+  }
+  else
+  {
+    if (pData->iBreakpoint)            /* do we need to finish something first ? */
+    {
+      switch (pData->iBreakpoint)      /* return to broken display routine */
+      {
+        case 1 : { iRetcode = process_display_fram2 (pData); break; }
+        case 2 : { iRetcode = process_display_ihdr  (pData); break; }
+        case 3 : ;                     /* same as 4 !!! */
+        case 4 : { iRetcode = process_display_show  (pData); break; }
+        case 5 : { iRetcode = process_display_clon2 (pData); break; }
+#ifdef MNG_INCLUDE_JNG
+        case 7 : { iRetcode = process_display_jhdr  (pData); break; }
+#endif
+        case 6 : ;                     /* same as 8 !!! */
+        case 8 : { iRetcode = process_display_iend  (pData); break; }
+        case 9 : { iRetcode = process_display_magn2 (pData); break; }
+      }
+    }
+  }
+
+  if (iRetcode)                        /* on error bail out */
+    return iRetcode;
+
+#endif /* MNG_SUPPORT_DISPLAY */
+                                       /* can we continue processing now, or do we */
+                                       /* need to wait for the timer to finish (again) ? */
+#ifdef MNG_SUPPORT_DISPLAY
+  if ((!pData->bTimerset) && (!pData->bSectionwait) && (!pData->bEOF))
+#else
+  if (!pData->bEOF)
+#endif
+  {                                    /* freezing in progress ? */
+    if ((pData->bFreezing) && (pData->iSuspendpoint == 0))
+      pData->bRunning = MNG_FALSE;     /* then this is the right moment to do it */
+
+    if (pData->iSuspendpoint <= 2)
+    {
+      iBuflen  = sizeof (mng_uint32);  /* read length */
+      iRetcode = read_databuffer (pData, pBuf, iBuflen, &iRead);
+
+      if (iRetcode)                    /* bail on errors */
+        return iRetcode;
+
+      if (pData->bSuspended)           /* suspended ? */
+        pData->iSuspendpoint = 2;
+      else                             /* save the length */
+        pData->iChunklen = mng_get_uint32 (pBuf);
+
+    }
+
+    if (!pData->bSuspended)            /* still going ? */
+    {                                  /* previously suspended or not eof ? */
+      if ((pData->iSuspendpoint > 2) || (iRead == iBuflen))
+      {                                /* determine length chunkname + data + crc */
+        iBuflen = pData->iChunklen + (mng_uint32)(sizeof (mng_chunkid) + sizeof (iCrc));
+
+        if (iBuflen < iBufmax)         /* does it fit in default buffer ? */
+        {                              /* note that we don't use the full size
+                                          so there's always a zero-byte at the
+                                          very end !!! */
+          iRetcode = read_databuffer (pData, pBuf, iBuflen, &iRead);
+
+          if (iRetcode)                /* bail on errors */
+            return iRetcode;
+
+          if (pData->bSuspended)       /* suspended ? */
+            pData->iSuspendpoint = 3;
+          else
+          {
+            if (iRead != iBuflen)      /* did we get all the data ? */
+              iRetcode = MNG_UNEXPECTEDEOF;
+            else
+            {
+              mng_uint32 iL = iBuflen - (mng_uint32)(sizeof (iCrc));
+                                       /* calculate the crc */
+              iCrc = crc (pData, pBuf, iL);
+                                       /* and check it */
+              if (!(iCrc == mng_get_uint32 (pBuf + iL)))
+                iRetcode = MNG_INVALIDCRC;
+              else
+                iRetcode = process_raw_chunk (pData, pBuf, iL);
+            }
+          }
+        }
+        else
+        {
+          if (!pData->iSuspendpoint)   /* create additional large buffer ? */
+          {                            /* again reserve space for the last zero-byte */
+            pData->iLargebufsize = iBuflen + 1;
+            MNG_ALLOC (pData, pData->pLargebuf, pData->iLargebufsize)
+          }
+
+          iRetcode = read_databuffer (pData, pData->pLargebuf, iBuflen, &iRead);
+
+          if (iRetcode)
+            return iRetcode;
+
+          if (pData->bSuspended)       /* suspended ? */
+            pData->iSuspendpoint = 4;
+          else
+          {
+            if (iRead != iBuflen)      /* did we get all the data ? */
+              iRetcode = MNG_UNEXPECTEDEOF;
+            else
+            {
+              mng_uint32 iL = iBuflen - (mng_uint32)(sizeof (iCrc));
+                                       /* calculate the crc */
+              iCrc = crc (pData, pData->pLargebuf, iL);
+                                       /* and check it */
+              if (!(iCrc == mng_get_uint32 (pData->pLargebuf + iL)))
+                iRetcode = MNG_INVALIDCRC;
+              else
+                iRetcode = process_raw_chunk (pData, pData->pLargebuf, iL);
+            }
+                                       /* cleanup additional large buffer */
+            MNG_FREE (pData, pData->pLargebuf, pData->iLargebufsize)
+          }  
+        }
+
+        if (iRetcode)                  /* on error bail out */
+          return iRetcode;
+
+      }
+      else
+      {                                /* that's final */
+        iRetcode = process_eof (pData);
+
+        if (iRetcode)                  /* on error bail out */
+          return iRetcode;
+
+        if ((iRead != 0) ||            /* did we get an unexpected eof ? */
+#ifdef MNG_INCLUDE_JNG
+            (pData->bHasIHDR || pData->bHasMHDR || pData->bHasJHDR))
+#else
+            (pData->bHasIHDR || pData->bHasMHDR))
+#endif
+          MNG_ERROR (pData, MNG_UNEXPECTEDEOF);
+      } 
+    }
+  }
+
+#ifdef MNG_SUPPORT_DISPLAY             /* refresh needed ? */
+  if ((!pData->bTimerset) && (!pData->bSuspended) && (pData->bNeedrefresh))
+  {
+    iRetcode = display_progressive_refresh (pData, 1);
+
+    if (iRetcode)                      /* on error bail out */
+      return iRetcode;
+  }
+#endif
+
+#ifdef MNG_SUPPORT_TRACE
+  MNG_TRACE (pData, MNG_FN_READ_CHUNK, MNG_LC_END)
+#endif
+
+  return MNG_NOERROR;
+}
+
+/* ************************************************************************** */
+
+mng_retcode read_graphic (mng_datap pData)
+{
+  mng_uint32  iBuflen;                 /* number of bytes requested */
+  mng_uint32  iRead;                   /* number of bytes read */
+  mng_retcode iRetcode;                /* temporary error-code */
+
+#ifdef MNG_SUPPORT_TRACE
+  MNG_TRACE (pData, MNG_FN_READ_GRAPHIC, MNG_LC_START)
+#endif
+
+  if (!pData->pReadbuf)                /* buffer allocated ? */
+  {
+    pData->iReadbufsize = 4200;        /* allocate a default read buffer */
+    MNG_ALLOC (pData, pData->pReadbuf, pData->iReadbufsize)
+  }
+                                       /* haven't processed the signature ? */
+  if ((!pData->bHavesig) || (pData->iSuspendpoint == 1))
+  {
+    iBuflen = 2 * sizeof (mng_uint32); /* read signature */
+
+    iRetcode = read_databuffer (pData, pData->pReadbuf, iBuflen, &iRead);
+
+    if (iRetcode)
+      return iRetcode;
+
+    if (pData->bSuspended)             /* input suspension ? */
+      pData->iSuspendpoint = 1;
+    else
+    {
+      if (iRead != iBuflen)            /* full signature received ? */
+        MNG_ERROR (pData, MNG_UNEXPECTEDEOF);
+                                       /* is it a valid signature ? */
+      if (mng_get_uint32 (pData->pReadbuf) == PNG_SIG)
+        pData->eSigtype = mng_it_png;
+      else
+      if (mng_get_uint32 (pData->pReadbuf) == JNG_SIG)
+        pData->eSigtype = mng_it_jng;
+      else
+      if (mng_get_uint32 (pData->pReadbuf) == MNG_SIG)
+        pData->eSigtype = mng_it_mng;
+      else
+        MNG_ERROR (pData, MNG_INVALIDSIG);
+                                       /* all of it ? */
+      if (mng_get_uint32 (pData->pReadbuf+4) != POST_SIG)
+        MNG_ERROR (pData, MNG_INVALIDSIG);
+
+      pData->bHavesig = MNG_TRUE;
+    }
+  }
+
+  if (!pData->bSuspended)              /* still going ? */
+  {
+    do
+    {
+      iRetcode = read_chunk (pData);   /* process a chunk */
+
+      if (iRetcode)                    /* on error bail out */
+        return iRetcode;
+    }
+#ifdef MNG_SUPPORT_DISPLAY             /* until EOF or a break-request */
+    while (((!pData->bEOF) || (pData->pCurraniobj)) && (!pData->bSuspended) &&
+           (!pData->bTimerset) && (!pData->bSectionwait));
+#else
+    while ((!pData->bEOF) && (!pData->bSuspended));
+#endif
+  }
+
+#ifdef MNG_SUPPORT_TRACE
+  MNG_TRACE (pData, MNG_FN_READ_GRAPHIC, MNG_LC_END)
+#endif
+
+  return MNG_NOERROR;
+}
+
+/* ************************************************************************** */
+
+#endif /* MNG_INCLUDE_READ_PROCS */
+
+/* ************************************************************************** */
+/* * end of file                                                            * */
+/* ************************************************************************** */
+