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140 lines
6.0 KiB
140 lines
6.0 KiB
/* ************************************************************************** */
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/* * For conditions of distribution and use, * */
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/* * see copyright notice in libmng.h * */
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/* ************************************************************************** */
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/* * * */
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/* * project : libmng * */
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/* * file : libmng_write.c copyright (c) 2000 G.Juyn * */
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/* * version : 1.0.0 * */
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/* * * */
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/* * purpose : Write management (implementation) * */
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/* * * */
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/* * author : G.Juyn * */
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/* * web : http://www.3-t.com * */
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/* * email : mailto:info@3-t.com * */
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/* * * */
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/* * comment : implementation of the write management routines * */
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/* * * */
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/* * changes : 0.5.1 - 05/08/2000 - G.Juyn * */
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/* * - changed strict-ANSI stuff * */
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/* * 0.5.1 - 05/12/2000 - G.Juyn * */
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/* * - changed trace to macro for callback error-reporting * */
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/* * 0.5.1 - 05/16/2000 - G.Juyn * */
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/* * - moved the actual write_graphic functionality from * */
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/* * mng_hlapi to it's appropriate function here * */
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/* * * */
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/* * 0.9.1 - 07/19/2000 - G.Juyn * */
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/* * - fixed writing of signature * */
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/* * * */
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/* * 0.9.2 - 08/05/2000 - G.Juyn * */
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/* * - changed file-prefixes * */
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/* * * */
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/* ************************************************************************** */
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#include "libmng.h"
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#include "libmng_data.h"
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#include "libmng_error.h"
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#include "libmng_trace.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#include "libmng_memory.h"
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#include "libmng_chunks.h"
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#include "libmng_chunk_io.h"
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#include "libmng_write.h"
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#if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI)
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#pragma option -A /* force ANSI-C */
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#endif
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/* ************************************************************************** */
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#ifdef MNG_INCLUDE_WRITE_PROCS
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/* ************************************************************************** */
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mng_retcode write_graphic (mng_datap pData)
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{
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mng_chunkp pChunk;
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mng_retcode iRetcode;
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mng_uint32 iWritten;
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#ifdef MNG_SUPPORT_TRACE
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MNG_TRACE (pData, MNG_FN_WRITE_GRAPHIC, MNG_LC_START)
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#endif
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pChunk = pData->pFirstchunk; /* we'll start with the first, thank you */
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if (pChunk) /* is there anything to write ? */
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{ /* open the file */
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if (!pData->fOpenstream ((mng_handle)pData))
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MNG_ERROR (pData, MNG_APPIOERROR)
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else
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{
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pData->bWriting = MNG_TRUE; /* indicate writing */
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pData->iWritebufsize = 32768; /* get a temporary write buffer */
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/* reserve 12 bytes for length, chunkname & crc */
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MNG_ALLOC (pData, pData->pWritebuf, pData->iWritebufsize+12)
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/* write the signature */
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if (((mng_chunk_headerp)pChunk)->iChunkname == MNG_UINT_IHDR)
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mng_put_uint32 (pData->pWritebuf, PNG_SIG);
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else
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if (((mng_chunk_headerp)pChunk)->iChunkname == MNG_UINT_JHDR)
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mng_put_uint32 (pData->pWritebuf, JNG_SIG);
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else
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mng_put_uint32 (pData->pWritebuf, MNG_SIG);
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mng_put_uint32 (pData->pWritebuf+4, POST_SIG);
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if (!pData->fWritedata ((mng_handle)pData, pData->pWritebuf, 8, &iWritten))
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{
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MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12)
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MNG_ERROR (pData, MNG_APPIOERROR)
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}
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if (iWritten != 8) /* disk full ? */
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{
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MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12)
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MNG_ERROR (pData, MNG_OUTPUTERROR)
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}
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while (pChunk) /* so long as there's something to write */
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{ /* let's call it's output routine */
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iRetcode = ((mng_chunk_headerp)pChunk)->fWrite (pData, pChunk);
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if (iRetcode) /* on error bail out */
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{
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MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12)
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return iRetcode;
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}
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/* neeeext */
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pChunk = ((mng_chunk_headerp)pChunk)->pNext;
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}
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/* free the temporary buffer */
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MNG_FREE (pData, pData->pWritebuf, pData->iWritebufsize+12)
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pData->bWriting = MNG_FALSE; /* done writing */
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/* close the stream now */
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if (!pData->fClosestream ((mng_handle)pData))
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MNG_ERROR (pData, MNG_APPIOERROR)
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}
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}
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#ifdef MNG_SUPPORT_TRACE
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MNG_TRACE (pData, MNG_FN_WRITE_GRAPHIC, MNG_LC_END)
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#endif
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return MNG_NOERROR;
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}
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/* ************************************************************************** */
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#endif /* MNG_INCLUDE_WRITE_PROCS */
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/* ************************************************************************** */
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/* * end of file * */
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/* ************************************************************************** */
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