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libmng_write.c

/* ************************************************************************** */
/* *             For conditions of distribution and use,                    * */
/* *                see copyright notice in libmng.h                        * */
/* ************************************************************************** */
/* *                                                                        * */
/* * project   : libmng                                                     * */
/* * file      : libmng_write.c            copyright (c) 2000-2004 G.Juyn   * */
/* * version   : 1.0.9                                                      * */
/* *                                                                        * */
/* * purpose   : Write management (implementation)                          * */
/* *                                                                        * */
/* * author    : G.Juyn                                                     * */
/* *                                                                        * */
/* * comment   : implementation of the write management routines            * */
/* *                                                                        * */
/* * changes   : 0.5.1 - 05/08/2000 - G.Juyn                                * */
/* *             - changed strict-ANSI stuff                                * */
/* *             0.5.1 - 05/12/2000 - G.Juyn                                * */
/* *             - changed trace to macro for callback error-reporting      * */
/* *             0.5.1 - 05/16/2000 - G.Juyn                                * */
/* *             - moved the actual write_graphic functionality from        * */
/* *               mng_hlapi to it's appropriate function here              * */
/* *                                                                        * */
/* *             0.9.1 - 07/19/2000 - G.Juyn                                * */
/* *             - fixed writing of signature                               * */
/* *                                                                        * */
/* *             0.9.2 - 08/05/2000 - G.Juyn                                * */
/* *             - changed file-prefixes                                    * */
/* *                                                                        * */
/* *             1.0.5 - 08/19/2002 - G.Juyn                                * */
/* *             - B597134 - libmng pollutes the linker namespace           * */
/* *                                                                        * */
/* *             1.0.8 - 07/06/2004 - G.R-P                                 * */
/* *             - added conditionals around openstream/closestream         * */
/* *             - defend against using undefined Open/Closestream function * */
/* *             1.0.8 - 08/02/2004 - G.Juyn                                * */
/* *             - added conditional to allow easier writing of large MNG's * */
/* *                                                                        * */
/* *             1.0.9 - 09/25/2004 - G.Juyn                                * */
/* *             - replaced MNG_TWEAK_LARGE_FILES with permanent solution   * */
/* *             1.0.9 - 12/20/2004 - G.Juyn                                * */
/* *             - cleaned up macro-invocations (thanks to D. Airlie)       * */
/* *                                                                        * */
/* ************************************************************************** */

#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_chunks.h"
#include "libmng_chunk_io.h"
#include "libmng_write.h"

#if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI)
#pragma option -A                      /* force ANSI-C */
#endif

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

#if defined(MNG_SUPPORT_READ) || defined(MNG_SUPPORT_WRITE)
mng_retcode mng_drop_chunks (mng_datap pData)
{
  mng_chunkp       pChunk;
  mng_chunkp       pNext;
  mng_cleanupchunk fCleanup;

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

  pChunk = pData->pFirstchunk;         /* and get first stored chunk (if any) */

  while (pChunk)                       /* more chunks to discard ? */
  {
    pNext = ((mng_chunk_headerp)pChunk)->pNext;
                                       /* call appropriate cleanup */
    fCleanup = ((mng_chunk_headerp)pChunk)->fCleanup;
    fCleanup (pData, pChunk);

    pChunk = pNext;                    /* neeeext */
  }

  pData->pFirstchunk = MNG_NULL;
  pData->pLastchunk  = MNG_NULL;

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

  return MNG_NOERROR;
}
#endif /* MNG_SUPPORT_READ || MNG_SUPPORT_WRITE */

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

#ifdef MNG_INCLUDE_WRITE_PROCS

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

mng_retcode mng_write_graphic (mng_datap pData)
{
  mng_chunkp  pChunk;
  mng_retcode iRetcode;
  mng_uint32  iWritten;

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

  pChunk = pData->pFirstchunk;         /* we'll start with the first, thank you */

  if (pChunk)                          /* is there anything to write ? */
  {                                    /* open the file */
    if (!pData->bWriting)
    {
#ifndef MNG_NO_OPEN_CLOSE_STREAM
      if (pData->fOpenstream && !pData->fOpenstream ((mng_handle)pData))
        MNG_ERROR (pData, MNG_APPIOERROR);
#endif
      {
        pData->bWriting      = MNG_TRUE; /* indicate writing */
        pData->iWritebufsize = 32768;    /* get a temporary write buffer */
                                       /* reserve 12 bytes for length, chunkname & crc */
        MNG_ALLOC (pData, pData->pWritebuf, pData->iWritebufsize+12);

                                       /* write the signature */
        if (((mng_chunk_headerp)pChunk)->iChunkname == MNG_UINT_IHDR)
          mng_put_uint32 (pData->pWritebuf, PNG_SIG);
        else
        if (((mng_chunk_headerp)pChunk)->iChunkname == MNG_UINT_JHDR)
          mng_put_uint32 (pData->pWritebuf, JNG_SIG);
        else
          mng_put_uint32 (pData->pWritebuf, MNG_SIG);

        mng_put_uint32 (pData->pWritebuf+4, POST_SIG);

        if (!pData->fWritedata ((mng_handle)pData, pData->pWritebuf, 8, &iWritten))
        {
          MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12);
          MNG_ERROR (pData, MNG_APPIOERROR);
        }

        if (iWritten != 8)             /* disk full ? */
        {
          MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12);
          MNG_ERROR (pData, MNG_OUTPUTERROR);
        }
      }
    }

    while (pChunk)                     /* so long as there's something to write */
    {                                  /* let's call it's output routine */
      iRetcode = ((mng_chunk_headerp)pChunk)->fWrite (pData, pChunk);
      if (iRetcode)                    /* on error bail out */
        return iRetcode;
                                       /* neeeext */
      pChunk = ((mng_chunk_headerp)pChunk)->pNext;
    }

    if (!pData->bCreating)
    {                                  /* free the temporary buffer */
      MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12);

      pData->bWriting = MNG_FALSE;     /* done writing */
                                       /* close the stream now */
#ifndef MNG_NO_OPEN_CLOSE_STREAM
      if (pData->fClosestream && !pData->fClosestream ((mng_handle)pData))
        MNG_ERROR (pData, MNG_APPIOERROR);
#endif

    } else {
                                       /* cleanup the written chunks */
      iRetcode = mng_drop_chunks (pData);
      if (iRetcode)                    /* on error bail out */
        return iRetcode;
    }
  }

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

  return MNG_NOERROR;
}

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

#endif /* MNG_INCLUDE_WRITE_PROCS */

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



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