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/* ************************************************************************** */
/* * 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 its 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 its 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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