/* ************************************************************************** */ /* * For conditions of distribution and use, * */ /* * see copyright notice in libmng.h * */ /* ************************************************************************** */ /* * * */ /* * project : libmng * */ /* * file : libmng_read.c copyright (c) 2000-2007 G.Juyn * */ /* * version : 1.0.10 * */ /* * * */ /* * purpose : Read logic (implementation) * */ /* * * */ /* * author : G.Juyn * */ /* * * */ /* * 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 * */ /* * * */ /* * 1.0.5 - 07/04/2002 - G.Juyn * */ /* * - added errorcode for extreme chunk-sizes * */ /* * 1.0.5 - 07/08/2002 - G.Juyn * */ /* * - B578572 - removed eMNGma hack (thanks Dimitri!) * */ /* * 1.0.5 - 07/16/2002 - G.Juyn * */ /* * - B581625 - large chunks fail with suspension reads * */ /* * 1.0.5 - 08/19/2002 - G.Juyn * */ /* * - B597134 - libmng pollutes the linker namespace * */ /* * - added HLAPI function to copy chunks * */ /* * 1.0.5 - 09/16/2002 - G.Juyn * */ /* * - added event handling for dynamic MNG * */ /* * * */ /* * 1.0.6 - 05/25/2003 - G.R-P * */ /* * - added MNG_SKIPCHUNK_cHNK footprint optimizations * */ /* * 1.0.6 - 07/07/2003 - G.R-P * */ /* * - added MNG_NO_DELTA_PNG reduction * */ /* * - skip additional code when MNG_INCLUDE_JNG is not enabled * */ /* * 1.0.6 - 07/29/2003 - G.R-P * */ /* * - added conditionals around PAST chunk support * */ /* * 1.0.6 - 08/17/2003 - G.R-P * */ /* * - added conditionals around non-VLC chunk support * */ /* * * */ /* * 1.0.7 - 03/10/2004 - G.R-P * */ /* * - added conditionals around openstream/closestream * */ /* * * */ /* * 1.0.8 - 04/08/2004 - G.Juyn * */ /* * - added CRC existence & checking flags * */ /* * 1.0.8 - 04/11/2004 - G.Juyn * */ /* * - added data-push mechanisms for specialized decoders * */ /* * 1.0.8 - 07/06/2004 - G.R-P * */ /* * - defend against using undefined closestream function * */ /* * 1.0.8 - 07/28/2004 - G.R-P * */ /* * - added check for extreme chunk-lengths * */ /* * * */ /* * 1.0.9 - 09/16/2004 - G.Juyn * */ /* * - fixed chunk pushing mechanism * */ /* * 1.0.9 - 12/05/2004 - G.Juyn * */ /* * - added conditional MNG_OPTIMIZE_CHUNKINITFREE * */ /* * 1.0.9 - 12/06/2004 - G.Juyn * */ /* * - added conditional MNG_OPTIMIZE_CHUNKASSIGN * */ /* * - added conditional MNG_OPTIMIZE_CHUNKREADER * */ /* * 1.0.9 - 12/20/2004 - G.Juyn * */ /* * - cleaned up macro-invocations (thanks to D. Airlie) * */ /* * 1.0.9 - 12/31/2004 - G.R-P * */ /* * - removed stray characters from #ifdef directive * */ /* * * */ /* * 1.0.10 - 04/08/2007 - G.Juyn * */ /* * - added support for mPNG proposal * */ /* * * */ /* ************************************************************************** */ #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" #ifdef MNG_OPTIMIZE_CHUNKREADER #include "libmng_chunk_descr.h" #endif #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 mng_process_eof (mng_datap pData) { if (!pData->bEOF) /* haven't closed the stream yet ? */ { pData->bEOF = MNG_TRUE; /* now we do! */ #ifndef MNG_NO_OPEN_CLOSE_STREAM if (pData->fClosestream && !pData->fClosestream ((mng_handle)pData)) { MNG_ERROR (pData, MNG_APPIOERROR); } #endif } return MNG_NOERROR; } /* ************************************************************************** */ mng_retcode mng_release_pushdata (mng_datap pData) { mng_pushdatap pFirst = pData->pFirstpushdata; mng_pushdatap pNext = pFirst->pNext; #ifdef MNG_SUPPORT_TRACE MNG_TRACE (pData, MNG_FN_RELEASE_PUSHDATA, MNG_LC_START); #endif pData->pFirstpushdata = pNext; /* next becomes the first */ if (!pNext) /* no next? => no last! */ pData->pLastpushdata = MNG_NULL; /* buffer owned and release callback defined? */ if ((pFirst->bOwned) && (pData->fReleasedata)) pData->fReleasedata ((mng_handle)pData, pFirst->pData, pFirst->iLength); else /* otherwise use internal free mechanism */ MNG_FREEX (pData, pFirst->pData, pFirst->iLength); /* and free it */ MNG_FREEX (pData, pFirst, sizeof(mng_pushdata)); #ifdef MNG_SUPPORT_TRACE MNG_TRACE (pData, MNG_FN_RELEASE_PUSHDATA, MNG_LC_END); #endif return MNG_NOERROR; } /* ************************************************************************** */ mng_retcode mng_release_pushchunk (mng_datap pData) { mng_pushdatap pFirst = pData->pFirstpushchunk; mng_pushdatap pNext = pFirst->pNext; #ifdef MNG_SUPPORT_TRACE MNG_TRACE (pData, MNG_FN_RELEASE_PUSHCHUNK, MNG_LC_START); #endif pData->pFirstpushchunk = pNext; /* next becomes the first */ if (!pNext) /* no next? => no last! */ pData->pLastpushchunk = MNG_NULL; /* buffer owned and release callback defined? */ if ((pFirst->bOwned) && (pData->fReleasedata)) pData->fReleasedata ((mng_handle)pData, pFirst->pData, pFirst->iLength); else /* otherwise use internal free mechanism */ MNG_FREEX (pData, pFirst->pData, pFirst->iLength); /* and free it */ MNG_FREEX (pData, pFirst, sizeof(mng_pushdata)); #ifdef MNG_SUPPORT_TRACE MNG_TRACE (pData, MNG_FN_RELEASE_PUSHCHUNK, MNG_LC_END); #endif return MNG_NOERROR; } /* ************************************************************************** */ MNG_LOCAL mng_retcode read_data (mng_datap pData, mng_uint8p pBuf, mng_uint32 iSize, mng_uint32 * iRead) { mng_retcode iRetcode; mng_uint32 iTempsize = iSize; mng_uint8p pTempbuf = pBuf; mng_pushdatap pPush = pData->pFirstpushdata; mng_uint32 iPushsize = 0; *iRead = 0; /* nothing yet */ #ifdef MNG_SUPPORT_TRACE MNG_TRACE (pData, MNG_FN_READ_DATA, MNG_LC_START); #endif while (pPush) /* calculate size of pushed data */ { iPushsize += pPush->iRemaining; pPush = pPush->pNext; } if (iTempsize <= iPushsize) /* got enough push data? */ { while (iTempsize) { pPush = pData->pFirstpushdata; /* enough data remaining in this buffer? */ if (pPush->iRemaining <= iTempsize) { /* no: then copy what we've got */ MNG_COPY (pTempbuf, pPush->pDatanext, pPush->iRemaining); /* move pointers & lengths */ pTempbuf += pPush->iRemaining; *iRead += pPush->iRemaining; iTempsize -= pPush->iRemaining; /* release the depleted buffer */ iRetcode = mng_release_pushdata (pData); if (iRetcode) return iRetcode; } else { /* copy the needed bytes */ MNG_COPY (pTempbuf, pPush->pDatanext, iTempsize); /* move pointers & lengths */ pPush->iRemaining -= iTempsize; pPush->pDatanext += iTempsize; pTempbuf += iTempsize; *iRead += iTempsize; iTempsize = 0; /* all done!!! */ } } } else { mng_uint32 iTempread = 0; /* get it from the app then */ if (!pData->fReaddata (((mng_handle)pData), pTempbuf, iTempsize, &iTempread)) MNG_ERROR (pData, MNG_APPIOERROR); *iRead += iTempread; } #ifdef MNG_SUPPORT_TRACE MNG_TRACE (pData, MNG_FN_READ_DATA, MNG_LC_END); #endif return MNG_NOERROR; } /* ************************************************************************** */ MNG_LOCAL mng_retcode read_databuffer (mng_datap pData, mng_uint8p pBuf, mng_uint8p * pBufnext, mng_uint32 iSize, mng_uint32 * iRead) { mng_retcode iRetcode; #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 (!*pBufnext) /* first time ? */ { if (pData->iSuspendbufleft) /* do we have some data left ? */ { /* then copy it */ MNG_COPY (pBuf, pData->pSuspendbufnext, pData->iSuspendbufleft); /* fixup variables */ *pBufnext = pBuf + pData->iSuspendbufleft; pData->pSuspendbufnext = pData->pSuspendbuf; pData->iSuspendbufleft = 0; } else { *pBufnext = pBuf; } } /* calculate how much to get */ iRemain = iSize - (mng_uint32)(*pBufnext - pBuf); /* let's go get it */ iRetcode = read_data (pData, *pBufnext, iRemain, &iTemp); if (iRetcode) return iRetcode; /* first read after suspension return 0 means EOF */ if ((pData->iSuspendpoint) && (iTemp == 0)) { /* that makes it final */ mng_retcode iRetcode = mng_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 required ? */ { *pBufnext = *pBufnext + 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_SUSPENDREQUESTSIZE) { 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_SUSPENDREQUESTSIZE) MNG_ERROR (pData, MNG_INTERNALERROR); /* now read some more data */ pTemp = pData->pSuspendbufnext + pData->iSuspendbufleft; iRetcode = read_data (pData, pTemp, MNG_SUSPENDREQUESTSIZE, &iTemp); if (iRetcode) return iRetcode; /* 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 = mng_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 required ? */ if ((iSize > pData->iSuspendbufleft) && (iTemp < MNG_SUSPENDREQUESTSIZE)) 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 { iRetcode = read_data (pData, (mng_ptr)pBuf, iSize, iRead); if (iRetcode) return iRetcode; if (*iRead == 0) /* suspension required ? */ pData->bSuspended = MNG_TRUE; } 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_LOCAL mng_retcode process_raw_chunk (mng_datap pData, mng_uint8p pBuf, mng_uint32 iBuflen) { #ifndef MNG_OPTIMIZE_CHUNKREADER /* 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 !!! (ps. watch upper-/lower-case chunknames !!) */ /* 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) */ #ifdef MNG_OPTIMIZE_CHUNKINITFREE mng_chunk_header mng_chunk_unknown = {MNG_UINT_HUH, mng_init_general, mng_free_unknown, mng_read_unknown, mng_write_unknown, mng_assign_unknown, 0, 0, sizeof(mng_unknown_chunk)}; #else mng_chunk_header mng_chunk_unknown = {MNG_UINT_HUH, mng_init_unknown, mng_free_unknown, mng_read_unknown, mng_write_unknown, mng_assign_unknown, 0, 0}; #endif #ifdef MNG_OPTIMIZE_CHUNKINITFREE mng_chunk_header mng_chunk_table [] = { #ifndef MNG_SKIPCHUNK_BACK {MNG_UINT_BACK, mng_init_general, mng_free_general, mng_read_back, mng_write_back, mng_assign_general, 0, 0, sizeof(mng_back)}, #endif #ifndef MNG_SKIPCHUNK_BASI {MNG_UINT_BASI, mng_init_general, mng_free_general, mng_read_basi, mng_write_basi, mng_assign_general, 0, 0, sizeof(mng_basi)}, #endif #ifndef MNG_SKIPCHUNK_CLIP {MNG_UINT_CLIP, mng_init_general, mng_free_general, mng_read_clip, mng_write_clip, mng_assign_general, 0, 0, sizeof(mng_clip)}, #endif #ifndef MNG_SKIPCHUNK_CLON {MNG_UINT_CLON, mng_init_general, mng_free_general, mng_read_clon, mng_write_clon, mng_assign_general, 0, 0, sizeof(mng_clon)}, #endif #ifndef MNG_NO_DELTA_PNG #ifndef MNG_SKIPCHUNK_DBYK {MNG_UINT_DBYK, mng_init_general, mng_free_dbyk, mng_read_dbyk, mng_write_dbyk, mng_assign_dbyk, 0, 0, sizeof(mng_dbyk)}, #endif #endif #ifndef MNG_SKIPCHUNK_DEFI {MNG_UINT_DEFI, mng_init_general, mng_free_general, mng_read_defi, mng_write_defi, mng_assign_general, 0, 0, sizeof(mng_defi)}, #endif #ifndef MNG_NO_DELTA_PNG {MNG_UINT_DHDR, mng_init_general, mng_free_general, mng_read_dhdr, mng_write_dhdr, mng_assign_general, 0, 0, sizeof(mng_dhdr)}, #endif #ifndef MNG_SKIPCHUNK_DISC {MNG_UINT_DISC, mng_init_general, mng_free_disc, mng_read_disc, mng_write_disc, mng_assign_disc, 0, 0, sizeof(mng_disc)}, #endif #ifndef MNG_NO_DELTA_PNG #ifndef MNG_SKIPCHUNK_DROP {MNG_UINT_DROP, mng_init_general, mng_free_drop, mng_read_drop, mng_write_drop, mng_assign_drop, 0, 0, sizeof(mng_drop)}, #endif #endif #ifndef MNG_SKIPCHUNK_LOOP {MNG_UINT_ENDL, mng_init_general, mng_free_general, mng_read_endl, mng_write_endl, mng_assign_general, 0, 0, sizeof(mng_endl)}, #endif #ifndef MNG_SKIPCHUNK_FRAM {MNG_UINT_FRAM, mng_init_general, mng_free_fram, mng_read_fram, mng_write_fram, mng_assign_fram, 0, 0, sizeof(mng_fram)}, #endif {MNG_UINT_IDAT, mng_init_general, mng_free_idat, mng_read_idat, mng_write_idat, mng_assign_idat, 0, 0, sizeof(mng_idat)}, /* 12-th element! */ {MNG_UINT_IEND, mng_init_general, mng_free_general, mng_read_iend, mng_write_iend, mng_assign_general, 0, 0, sizeof(mng_iend)}, {MNG_UINT_IHDR, mng_init_general, mng_free_general, mng_read_ihdr, mng_write_ihdr, mng_assign_general, 0, 0, sizeof(mng_ihdr)}, #ifndef MNG_NO_DELTA_PNG #ifdef MNG_INCLUDE_JNG {MNG_UINT_IJNG, mng_init_general, mng_free_general, mng_read_ijng, mng_write_ijng, mng_assign_general, 0, 0, sizeof(mng_ijng)}, #endif {MNG_UINT_IPNG, mng_init_general, mng_free_general, mng_read_ipng, mng_write_ipng, mng_assign_general, 0, 0, sizeof(mng_ipng)}, #endif #ifdef MNG_INCLUDE_JNG {MNG_UINT_JDAA, mng_init_general, mng_free_jdaa, mng_read_jdaa, mng_write_jdaa, mng_assign_jdaa, 0, 0, sizeof(mng_jdaa)}, {MNG_UINT_JDAT, mng_init_general, mng_free_jdat, mng_read_jdat, mng_write_jdat, mng_assign_jdat, 0, 0, sizeof(mng_jdat)}, {MNG_UINT_JHDR, mng_init_general, mng_free_general, mng_read_jhdr, mng_write_jhdr, mng_assign_general, 0, 0, sizeof(mng_jhdr)}, {MNG_UINT_JSEP, mng_init_general, mng_free_general, mng_read_jsep, mng_write_jsep, mng_assign_general, 0, 0, sizeof(mng_jsep)}, {MNG_UINT_JdAA, mng_init_general, mng_free_jdaa, mng_read_jdaa, mng_write_jdaa, mng_assign_jdaa, 0, 0, sizeof(mng_jdaa)}, #endif #ifndef MNG_SKIPCHUNK_LOOP {MNG_UINT_LOOP, mng_init_general, mng_free_loop, mng_read_loop, mng_write_loop, mng_assign_loop, 0, 0, sizeof(mng_loop)}, #endif #ifndef MNG_SKIPCHUNK_MAGN {MNG_UINT_MAGN, mng_init_general, mng_free_general, mng_read_magn, mng_write_magn, mng_assign_general, 0, 0, sizeof(mng_magn)}, #endif {MNG_UINT_MEND, mng_init_general, mng_free_general, mng_read_mend, mng_write_mend, mng_assign_general, 0, 0, sizeof(mng_mend)}, {MNG_UINT_MHDR, mng_init_general, mng_free_general, mng_read_mhdr, mng_write_mhdr, mng_assign_general, 0, 0, sizeof(mng_mhdr)}, #ifndef MNG_SKIPCHUNK_MOVE {MNG_UINT_MOVE, mng_init_general, mng_free_general, mng_read_move, mng_write_move, mng_assign_general, 0, 0, sizeof(mng_move)}, #endif #ifndef MNG_NO_DELTA_PNG #ifndef MNG_SKIPCHUNK_ORDR {MNG_UINT_ORDR, mng_init_general, mng_free_ordr, mng_read_ordr, mng_write_ordr, mng_assign_ordr, 0, 0, sizeof(mng_ordr)}, #endif #endif #ifndef MNG_SKIPCHUNK_PAST {MNG_UINT_PAST, mng_init_general, mng_free_past, mng_read_past, mng_write_past, mng_assign_past, 0, 0, sizeof(mng_past)}, #endif {MNG_UINT_PLTE, mng_init_general, mng_free_general, mng_read_plte, mng_write_plte, mng_assign_general, 0, 0, sizeof(mng_plte)}, #ifndef MNG_NO_DELTA_PNG {MNG_UINT_PPLT, mng_init_general, mng_free_general, mng_read_pplt, mng_write_pplt, mng_assign_general, 0, 0, sizeof(mng_pplt)}, {MNG_UINT_PROM, mng_init_general, mng_free_general, mng_read_prom, mng_write_prom, mng_assign_general, 0, 0, sizeof(mng_prom)}, #endif #ifndef MNG_SKIPCHUNK_SAVE {MNG_UINT_SAVE, mng_init_general, mng_free_save, mng_read_save, mng_write_save, mng_assign_save, 0, 0, sizeof(mng_save)}, #endif #ifndef MNG_SKIPCHUNK_SEEK {MNG_UINT_SEEK, mng_init_general, mng_free_seek, mng_read_seek, mng_write_seek, mng_assign_seek, 0, 0, sizeof(mng_seek)}, #endif #ifndef MNG_SKIPCHUNK_SHOW {MNG_UINT_SHOW, mng_init_general, mng_free_general, mng_read_show, mng_write_show, mng_assign_general, 0, 0, sizeof(mng_show)}, #endif #ifndef MNG_SKIPCHUNK_TERM {MNG_UINT_TERM, mng_init_general, mng_free_general, mng_read_term, mng_write_term, mng_assign_general, 0, 0, sizeof(mng_term)}, #endif #ifndef MNG_SKIPCHUNK_bKGD {MNG_UINT_bKGD, mng_init_general, mng_free_general, mng_read_bkgd, mng_write_bkgd, mng_assign_general, 0, 0, sizeof(mng_bkgd)}, #endif #ifndef MNG_SKIPCHUNK_cHRM {MNG_UINT_cHRM, mng_init_general, mng_free_general, mng_read_chrm, mng_write_chrm, mng_assign_general, 0, 0, sizeof(mng_chrm)}, #endif #ifndef MNG_SKIPCHUNK_eXPI {MNG_UINT_eXPI, mng_init_general, mng_free_expi, mng_read_expi, mng_write_expi, mng_assign_expi, 0, 0, sizeof(mng_expi)}, #endif #ifndef MNG_SKIPCHUNK_evNT {MNG_UINT_evNT, mng_init_general, mng_free_evnt, mng_read_evnt, mng_write_evnt, mng_assign_evnt, 0, 0, sizeof(mng_evnt)}, #endif #ifndef MNG_SKIPCHUNK_fPRI {MNG_UINT_fPRI, mng_init_general, mng_free_general, mng_read_fpri, mng_write_fpri, mng_assign_general, 0, 0, sizeof(mng_fpri)}, #endif #ifndef MNG_SKIPCHUNK_gAMA {MNG_UINT_gAMA, mng_init_general, mng_free_general, mng_read_gama, mng_write_gama, mng_assign_general, 0, 0, sizeof(mng_gama)}, #endif #ifndef MNG_SKIPCHUNK_hIST {MNG_UINT_hIST, mng_init_general, mng_free_general, mng_read_hist, mng_write_hist, mng_assign_general, 0, 0, sizeof(mng_hist)}, #endif #ifndef MNG_SKIPCHUNK_iCCP {MNG_UINT_iCCP, mng_init_general, mng_free_iccp, mng_read_iccp, mng_write_iccp, mng_assign_iccp, 0, 0, sizeof(mng_iccp)}, #endif #ifndef MNG_SKIPCHUNK_iTXt {MNG_UINT_iTXt, mng_init_general, mng_free_itxt, mng_read_itxt, mng_write_itxt, mng_assign_itxt, 0, 0, sizeof(mng_itxt)}, #endif #ifdef MNG_INCLUDE_MPNG_PROPOSAL {MNG_UINT_mpNG, mng_init_general, mng_free_mpng, mng_read_mpng, mng_write_mpng, mng_assign_mpng, 0, 0, sizeof(mng_mpng)}, #endif #ifndef MNG_SKIPCHUNK_nEED {MNG_UINT_nEED, mng_init_general, mng_free_need, mng_read_need, mng_write_need, mng_assign_need, 0, 0, sizeof(mng_need)}, #endif /* TODO: {MNG_UINT_oFFs, 0, 0, 0, 0, 0, 0}, */ /* TODO: {MNG_UINT_pCAL, 0, 0, 0, 0, 0, 0}, */ #ifndef MNG_SKIPCHUNK_pHYg {MNG_UINT_pHYg, mng_init_general, mng_free_general, mng_read_phyg, mng_write_phyg, mng_assign_general, 0, 0, sizeof(mng_phyg)}, #endif #ifndef MNG_SKIPCHUNK_pHYs {MNG_UINT_pHYs, mng_init_general, mng_free_general, mng_read_phys, mng_write_phys, mng_assign_general, 0, 0, sizeof(mng_phys)}, #endif #ifndef MNG_SKIPCHUNK_sBIT {MNG_UINT_sBIT, mng_init_general, mng_free_general, mng_read_sbit, mng_write_sbit, mng_assign_general, 0, 0, sizeof(mng_sbit)}, #endif /* TODO: {MNG_UINT_sCAL, 0, 0, 0, 0, 0, 0}, */ #ifndef MNG_SKIPCHUNK_sPLT {MNG_UINT_sPLT, mng_init_general, mng_free_splt, mng_read_splt, mng_write_splt, mng_assign_splt, 0, 0, sizeof(mng_splt)}, #endif {MNG_UINT_sRGB, mng_init_general, mng_free_general, mng_read_srgb, mng_write_srgb, mng_assign_general, 0, 0, sizeof(mng_srgb)}, #ifndef MNG_SKIPCHUNK_tEXt {MNG_UINT_tEXt, mng_init_general, mng_free_text, mng_read_text, mng_write_text, mng_assign_text, 0, 0, sizeof(mng_text)}, #endif #ifndef MNG_SKIPCHUNK_tIME {MNG_UINT_tIME, mng_init_general, mng_free_general, mng_read_time, mng_write_time, mng_assign_general, 0, 0, sizeof(mng_time)}, #endif {MNG_UINT_tRNS, mng_init_general, mng_free_general, mng_read_trns, mng_write_trns, mng_assign_general, 0, 0, sizeof(mng_trns)}, #ifndef MNG_SKIPCHUNK_zTXt {MNG_UINT_zTXt, mng_init_general, mng_free_ztxt, mng_read_ztxt, mng_write_ztxt, mng_assign_ztxt, 0, 0, sizeof(mng_ztxt)}, #endif }; #else /* MNG_OPTIMIZE_CHUNKINITFREE */ mng_chunk_header mng_chunk_table [] = { #ifndef MNG_SKIPCHUNK_BACK {MNG_UINT_BACK, mng_init_back, mng_free_back, mng_read_back, mng_write_back, mng_assign_back, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_BASI {MNG_UINT_BASI, mng_init_basi, mng_free_basi, mng_read_basi, mng_write_basi, mng_assign_basi, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_CLIP {MNG_UINT_CLIP, mng_init_clip, mng_free_clip, mng_read_clip, mng_write_clip, mng_assign_clip, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_CLON {MNG_UINT_CLON, mng_init_clon, mng_free_clon, mng_read_clon, mng_write_clon, mng_assign_clon, 0, 0}, #endif #ifndef MNG_NO_DELTA_PNG #ifndef MNG_SKIPCHUNK_DBYK {MNG_UINT_DBYK, mng_init_dbyk, mng_free_dbyk, mng_read_dbyk, mng_write_dbyk, mng_assign_dbyk, 0, 0}, #endif #endif #ifndef MNG_SKIPCHUNK_DEFI {MNG_UINT_DEFI, mng_init_defi, mng_free_defi, mng_read_defi, mng_write_defi, mng_assign_defi, 0, 0}, #endif #ifndef MNG_NO_DELTA_PNG {MNG_UINT_DHDR, mng_init_dhdr, mng_free_dhdr, mng_read_dhdr, mng_write_dhdr, mng_assign_dhdr, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_DISC {MNG_UINT_DISC, mng_init_disc, mng_free_disc, mng_read_disc, mng_write_disc, mng_assign_disc, 0, 0}, #endif #ifndef MNG_NO_DELTA_PNG #ifndef MNG_SKIPCHUNK_DROP {MNG_UINT_DROP, mng_init_drop, mng_free_drop, mng_read_drop, mng_write_drop, mng_assign_drop, 0, 0}, #endif #endif #ifndef MNG_SKIPCHUNK_LOOP {MNG_UINT_ENDL, mng_init_endl, mng_free_endl, mng_read_endl, mng_write_endl, mng_assign_endl, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_FRAM {MNG_UINT_FRAM, mng_init_fram, mng_free_fram, mng_read_fram, mng_write_fram, mng_assign_fram, 0, 0}, #endif {MNG_UINT_IDAT, mng_init_idat, mng_free_idat, mng_read_idat, mng_write_idat, mng_assign_idat, 0, 0}, /* 12-th element! */ {MNG_UINT_IEND, mng_init_iend, mng_free_iend, mng_read_iend, mng_write_iend, mng_assign_iend, 0, 0}, {MNG_UINT_IHDR, mng_init_ihdr, mng_free_ihdr, mng_read_ihdr, mng_write_ihdr, mng_assign_ihdr, 0, 0}, #ifndef MNG_NO_DELTA_PNG #ifdef MNG_INCLUDE_JNG {MNG_UINT_IJNG, mng_init_ijng, mng_free_ijng, mng_read_ijng, mng_write_ijng, mng_assign_ijng, 0, 0}, #endif {MNG_UINT_IPNG, mng_init_ipng, mng_free_ipng, mng_read_ipng, mng_write_ipng, mng_assign_ipng, 0, 0}, #endif #ifdef MNG_INCLUDE_JNG {MNG_UINT_JDAA, mng_init_jdaa, mng_free_jdaa, mng_read_jdaa, mng_write_jdaa, mng_assign_jdaa, 0, 0}, {MNG_UINT_JDAT, mng_init_jdat, mng_free_jdat, mng_read_jdat, mng_write_jdat, mng_assign_jdat, 0, 0}, {MNG_UINT_JHDR, mng_init_jhdr, mng_free_jhdr, mng_read_jhdr, mng_write_jhdr, mng_assign_jhdr, 0, 0}, {MNG_UINT_JSEP, mng_init_jsep, mng_free_jsep, mng_read_jsep, mng_write_jsep, mng_assign_jsep, 0, 0}, {MNG_UINT_JdAA, mng_init_jdaa, mng_free_jdaa, mng_read_jdaa, mng_write_jdaa, mng_assign_jdaa, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_LOOP {MNG_UINT_LOOP, mng_init_loop, mng_free_loop, mng_read_loop, mng_write_loop, mng_assign_loop, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_MAGN {MNG_UINT_MAGN, mng_init_magn, mng_free_magn, mng_read_magn, mng_write_magn, mng_assign_magn, 0, 0}, #endif {MNG_UINT_MEND, mng_init_mend, mng_free_mend, mng_read_mend, mng_write_mend, mng_assign_mend, 0, 0}, {MNG_UINT_MHDR, mng_init_mhdr, mng_free_mhdr, mng_read_mhdr, mng_write_mhdr, mng_assign_mhdr, 0, 0}, #ifndef MNG_SKIPCHUNK_MOVE {MNG_UINT_MOVE, mng_init_move, mng_free_move, mng_read_move, mng_write_move, mng_assign_move, 0, 0}, #endif #ifndef MNG_NO_DELTA_PNG #ifndef MNG_SKIPCHUNK_ORDR {MNG_UINT_ORDR, mng_init_ordr, mng_free_ordr, mng_read_ordr, mng_write_ordr, mng_assign_ordr, 0, 0}, #endif #endif #ifndef MNG_SKIPCHUNK_PAST {MNG_UINT_PAST, mng_init_past, mng_free_past, mng_read_past, mng_write_past, mng_assign_past, 0, 0}, #endif {MNG_UINT_PLTE, mng_init_plte, mng_free_plte, mng_read_plte, mng_write_plte, mng_assign_plte, 0, 0}, #ifndef MNG_NO_DELTA_PNG {MNG_UINT_PPLT, mng_init_pplt, mng_free_pplt, mng_read_pplt, mng_write_pplt, mng_assign_pplt, 0, 0}, {MNG_UINT_PROM, mng_init_prom, mng_free_prom, mng_read_prom, mng_write_prom, mng_assign_prom, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_SAVE {MNG_UINT_SAVE, mng_init_save, mng_free_save, mng_read_save, mng_write_save, mng_assign_save, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_SEEK {MNG_UINT_SEEK, mng_init_seek, mng_free_seek, mng_read_seek, mng_write_seek, mng_assign_seek, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_SHOW {MNG_UINT_SHOW, mng_init_show, mng_free_show, mng_read_show, mng_write_show, mng_assign_show, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_TERM {MNG_UINT_TERM, mng_init_term, mng_free_term, mng_read_term, mng_write_term, mng_assign_term, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_bKGD {MNG_UINT_bKGD, mng_init_bkgd, mng_free_bkgd, mng_read_bkgd, mng_write_bkgd, mng_assign_bkgd, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_cHRM {MNG_UINT_cHRM, mng_init_chrm, mng_free_chrm, mng_read_chrm, mng_write_chrm, mng_assign_chrm, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_eXPI {MNG_UINT_eXPI, mng_init_expi, mng_free_expi, mng_read_expi, mng_write_expi, mng_assign_expi, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_evNT {MNG_UINT_evNT, mng_init_evnt, mng_free_evnt, mng_read_evnt, mng_write_evnt, mng_assign_evnt, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_fPRI {MNG_UINT_fPRI, mng_init_fpri, mng_free_fpri, mng_read_fpri, mng_write_fpri, mng_assign_fpri, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_gAMA {MNG_UINT_gAMA, mng_init_gama, mng_free_gama, mng_read_gama, mng_write_gama, mng_assign_gama, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_hIST {MNG_UINT_hIST, mng_init_hist, mng_free_hist, mng_read_hist, mng_write_hist, mng_assign_hist, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_iCCP {MNG_UINT_iCCP, mng_init_iccp, mng_free_iccp, mng_read_iccp, mng_write_iccp, mng_assign_iccp, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_iTXt {MNG_UINT_iTXt, mng_init_itxt, mng_free_itxt, mng_read_itxt, mng_write_itxt, mng_assign_itxt, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_nEED {MNG_UINT_nEED, mng_init_need, mng_free_need, mng_read_need, mng_write_need, mng_assign_need, 0, 0}, #endif /* TODO: {MNG_UINT_oFFs, 0, 0, 0, 0, 0, 0}, */ /* TODO: {MNG_UINT_pCAL, 0, 0, 0, 0, 0, 0}, */ #ifndef MNG_SKIPCHUNK_pHYg {MNG_UINT_pHYg, mng_init_phyg, mng_free_phyg, mng_read_phyg, mng_write_phyg, mng_assign_phyg, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_pHYs {MNG_UINT_pHYs, mng_init_phys, mng_free_phys, mng_read_phys, mng_write_phys, mng_assign_phys, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_sBIT {MNG_UINT_sBIT, mng_init_sbit, mng_free_sbit, mng_read_sbit, mng_write_sbit, mng_assign_sbit, 0, 0}, #endif /* TODO: {MNG_UINT_sCAL, 0, 0, 0, 0, 0, 0}, */ #ifndef MNG_SKIPCHUNK_sPLT {MNG_UINT_sPLT, mng_init_splt, mng_free_splt, mng_read_splt, mng_write_splt, mng_assign_splt, 0, 0}, #endif {MNG_UINT_sRGB, mng_init_srgb, mng_free_srgb, mng_read_srgb, mng_write_srgb, mng_assign_srgb, 0, 0}, #ifndef MNG_SKIPCHUNK_tEXt {MNG_UINT_tEXt, mng_init_text, mng_free_text, mng_read_text, mng_write_text, mng_assign_text, 0, 0}, #endif #ifndef MNG_SKIPCHUNK_tIME {MNG_UINT_tIME, mng_init_time, mng_free_time, mng_read_time, mng_write_time, mng_assign_time, 0, 0}, #endif {MNG_UINT_tRNS, mng_init_trns, mng_free_trns, mng_read_trns, mng_write_trns, mng_assign_trns, 0, 0}, #ifndef MNG_SKIPCHUNK_zTXt {MNG_UINT_zTXt, mng_init_ztxt, mng_free_ztxt, mng_read_ztxt, mng_write_ztxt, mng_assign_ztxt, 0, 0}, #endif }; #endif /* MNG_OPTIMIZE_CHUNKINITFREE */ /* binary search variables */ mng_int32 iTop, iLower, iUpper, iMiddle; mng_chunk_headerp pEntry; /* pointer to found entry */ #else mng_chunk_header sEntry; /* temp chunk-header */ #endif /* MNG_OPTIMIZE_CHUNKREADER */ 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 /* reset timer indicator on read-cycle */ if ((pData->bReading) && (!pData->bDisplaying)) pData->bTimerset = MNG_FALSE; /* get the chunkname */ iChunkname = (mng_chunkid)(mng_get_uint32 (pBuf)); pBuf += sizeof (mng_chunkid); /* adjust the buffer */ iBuflen -= sizeof (mng_chunkid); pChunk = 0; #ifndef MNG_OPTIMIZE_CHUNKREADER /* determine max index of table */ iTop = (sizeof (mng_chunk_table) / sizeof (mng_chunk_table [0])) - 1; /* binary search; with 54 chunks, worst-case is 7 comparisons */ iLower = 0; #ifndef MNG_NO_DELTA_PNG iMiddle = 11; /* start with the IDAT entry */ #else iMiddle = 8; #endif iUpper = iTop; pEntry = 0; /* no goods yet! */ do /* the binary search itself */ { if (mng_chunk_table [iMiddle].iChunkname < iChunkname) iLower = iMiddle + 1; else if (mng_chunk_table [iMiddle].iChunkname > iChunkname) iUpper = iMiddle - 1; else { pEntry = &mng_chunk_table [iMiddle]; break; } iMiddle = (iLower + iUpper) >> 1; } while (iLower <= iUpper); if (!pEntry) /* unknown chunk ? */ pEntry = &mng_chunk_unknown; /* make it so! */ #else /* MNG_OPTIMIZE_CHUNKREADER */ mng_get_chunkheader (iChunkname, &sEntry); #endif /* MNG_OPTIMIZE_CHUNKREADER */ pData->iChunkname = iChunkname; /* keep track of where we are */ pData->iChunkseq++; #ifndef MNG_OPTIMIZE_CHUNKREADER 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->iChunkname == MNG_UINT_HUH)) ((mng_chunk_headerp)pChunk)->iChunkname = iChunkname; } } #else /* MNG_OPTIMIZE_CHUNKREADER */ if (sEntry.fRead) /* read-callback available ? */ { iRetcode = sEntry.fRead (pData, &sEntry, iBuflen, (mng_ptr)pBuf, &pChunk); #ifndef MNG_OPTIMIZE_CHUNKREADER if (!iRetcode) /* everything oke ? */ { /* remember unknown chunk's id */ if ((pChunk) && (sEntry.iChunkname == MNG_UINT_HUH)) ((mng_chunk_headerp)pChunk)->iChunkname = iChunkname; } #endif } #endif /* MNG_OPTIMIZE_CHUNKREADER */ else iRetcode = MNG_NOERROR; if (pChunk) /* store this chunk ? */ mng_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 = mng_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_LOCAL mng_retcode check_chunk_crc (mng_datap pData, mng_uint8p pBuf, mng_uint32 iBuflen) { mng_uint32 iCrc; /* calculated CRC */ mng_bool bDiscard = MNG_FALSE; mng_retcode iRetcode = MNG_NOERROR; #ifdef MNG_SUPPORT_TRACE MNG_TRACE (pData, MNG_FN_READ_CHUNK_CRC, MNG_LC_START); #endif if (pData->iCrcmode & MNG_CRC_INPUT) /* crc included ? */ { mng_bool bCritical = (mng_bool)((*pBuf & 0x20) == 0); mng_uint32 iL = iBuflen - (mng_uint32)(sizeof (iCrc)); if (((bCritical ) && (pData->iCrcmode & MNG_CRC_CRITICAL )) || ((!bCritical) && (pData->iCrcmode & MNG_CRC_ANCILLARY))) { /* calculate the crc */ iCrc = mng_crc (pData, pBuf, iL); /* and check it */ if (!(iCrc == mng_get_uint32 (pBuf + iL))) { mng_bool bWarning = MNG_FALSE; mng_bool bError = MNG_FALSE; if (bCritical) { switch (pData->iCrcmode & MNG_CRC_CRITICAL) { case MNG_CRC_CRITICAL_WARNING : { bWarning = MNG_TRUE; break; } case MNG_CRC_CRITICAL_ERROR : { bError = MNG_TRUE; break; } } } else { switch (pData->iCrcmode & MNG_CRC_ANCILLARY) { case MNG_CRC_ANCILLARY_DISCARD : { bDiscard = MNG_TRUE; break; } case MNG_CRC_ANCILLARY_WARNING : { bWarning = MNG_TRUE; break; } case MNG_CRC_ANCILLARY_ERROR : { bError = MNG_TRUE; break; } } } if (bWarning) MNG_WARNING (pData, MNG_INVALIDCRC); if (bError) MNG_ERROR (pData, MNG_INVALIDCRC); } } if (!bDiscard) /* still processing ? */ iRetcode = process_raw_chunk (pData, pBuf, iL); } else { /* no crc => straight onto processing */ iRetcode = process_raw_chunk (pData, pBuf, iBuflen); } #ifdef MNG_SUPPORT_TRACE MNG_TRACE (pData, MNG_FN_READ_CHUNK_CRC, MNG_LC_END); #endif return iRetcode; } /* ************************************************************************** */ MNG_LOCAL 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_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)) { /* reset timer indicator on read-cycle */ if ((pData->bReading) && (!pData->bDisplaying)) pData->bTimerset = MNG_FALSE; pData->pCurraniobj = ((mng_object_headerp)pData->pCurraniobj)->pNext; /* TERM processing to be done ? */ if ((!pData->pCurraniobj) && (pData->bHasTERM) && (!pData->bHasMHDR)) iRetcode = mng_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 */ { #ifndef MNG_SKIPCHUNK_FRAM case 1 : { iRetcode = mng_process_display_fram2 (pData); break; } #endif case 2 : { iRetcode = mng_process_display_ihdr (pData); break; } #ifndef MNG_SKIPCHUNK_SHOW case 3 : ; /* same as 4 !!! */ case 4 : { iRetcode = mng_process_display_show (pData); break; } #endif #ifndef MNG_SKIPCHUNK_CLON case 5 : { iRetcode = mng_process_display_clon2 (pData); break; } #endif #ifdef MNG_INCLUDE_JNG case 7 : { iRetcode = mng_process_display_jhdr (pData); break; } #endif case 6 : ; /* same as 8 !!! */ case 8 : { iRetcode = mng_process_display_iend (pData); break; } #ifndef MNG_SKIPCHUNK_MAGN case 9 : { iRetcode = mng_process_display_magn2 (pData); break; } #endif case 10 : { iRetcode = mng_process_display_mend2 (pData); break; } #ifndef MNG_SKIPCHUNK_PAST case 11 : { iRetcode = mng_process_display_past2 (pData); break; } #endif } } } 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 { #ifdef MNG_SUPPORT_DISPLAY /* freezing in progress ? */ if ((pData->bFreezing) && (pData->iSuspendpoint == 0)) pData->bRunning = MNG_FALSE; /* then this is the right moment to do it */ #endif if (pData->iSuspendpoint <= 2) { iBuflen = sizeof (mng_uint32); /* read length */ iRetcode = read_databuffer (pData, pBuf, &pData->pReadbufnext, 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->iChunklen > 0x7ffffff) return MNG_INVALIDLENGTH; } } if (!pData->bSuspended) /* still going ? */ { /* previously suspended or not eof ? */ if ((pData->iSuspendpoint > 2) || (iRead == iBuflen)) { /* determine length chunkname + data (+ crc) */ if (pData->iCrcmode & MNG_CRC_INPUT) iBuflen = pData->iChunklen + (mng_uint32)(sizeof (mng_chunkid) + sizeof (mng_uint32)); else iBuflen = pData->iChunklen + (mng_uint32)(sizeof (mng_chunkid)); /* do we have enough data in the current push buffer ? */ if ((pData->pFirstpushdata) && (iBuflen <= pData->pFirstpushdata->iRemaining)) { mng_pushdatap pPush = pData->pFirstpushdata; pBuf = pPush->pDatanext; pPush->pDatanext += iBuflen; pPush->iRemaining -= iBuflen; pData->iSuspendpoint = 0; /* safely reset this here ! */ iRetcode = check_chunk_crc (pData, pBuf, iBuflen); if (iRetcode) return iRetcode; if (!pPush->iRemaining) /* buffer depleted? then release it */ iRetcode = mng_release_pushdata (pData); } else { 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, &pData->pReadbufnext, 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 ? */ MNG_ERROR (pData, MNG_UNEXPECTEDEOF); iRetcode = check_chunk_crc (pData, pBuf, iBuflen); } } else { if (iBuflen > 16777216) /* is the length incredible? */ MNG_ERROR (pData, MNG_IMPROBABLELENGTH); if (!pData->iSuspendpoint) /* create additional large buffer ? */ { /* again reserve space for the last zero-byte */ pData->iLargebufsize = iBuflen + 1; pData->pLargebufnext = MNG_NULL; MNG_ALLOC (pData, pData->pLargebuf, pData->iLargebufsize); } iRetcode = read_databuffer (pData, pData->pLargebuf, &pData->pLargebufnext, iBuflen, &iRead); if (iRetcode) return iRetcode; if (pData->bSuspended) /* suspended ? */ pData->iSuspendpoint = 4; else { if (iRead != iBuflen) /* did we get all the data ? */ MNG_ERROR (pData, MNG_UNEXPECTEDEOF); iRetcode = check_chunk_crc (pData, pData->pLargebuf, iBuflen); /* cleanup additional large buffer */ MNG_FREE (pData, pData->pLargebuf, pData->iLargebufsize); } } } if (iRetcode) /* on error bail out */ return iRetcode; } else { /* that's final */ iRetcode = mng_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 = mng_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_LOCAL mng_retcode process_pushedchunk (mng_datap pData) { mng_pushdatap pPush; mng_retcode iRetcode = MNG_NOERROR; #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)) { /* reset timer indicator on read-cycle */ if ((pData->bReading) && (!pData->bDisplaying)) pData->bTimerset = MNG_FALSE; pData->pCurraniobj = ((mng_object_headerp)pData->pCurraniobj)->pNext; /* TERM processing to be done ? */ if ((!pData->pCurraniobj) && (pData->bHasTERM) && (!pData->bHasMHDR)) iRetcode = mng_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 */ { #ifndef MNG_SKIPCHUNK_FRAM case 1 : { iRetcode = mng_process_display_fram2 (pData); break; } #endif case 2 : { iRetcode = mng_process_display_ihdr (pData); break; } #ifndef MNG_SKIPCHUNK_SHOW case 3 : ; /* same as 4 !!! */ case 4 : { iRetcode = mng_process_display_show (pData); break; } #endif #ifndef MNG_SKIPCHUNK_CLON case 5 : { iRetcode = mng_process_display_clon2 (pData); break; } #endif #ifdef MNG_INCLUDE_JNG case 7 : { iRetcode = mng_process_display_jhdr (pData); break; } #endif case 6 : ; /* same as 8 !!! */ case 8 : { iRetcode = mng_process_display_iend (pData); break; } #ifndef MNG_SKIPCHUNK_MAGN case 9 : { iRetcode = mng_process_display_magn2 (pData); break; } #endif case 10 : { iRetcode = mng_process_display_mend2 (pData); break; } #ifndef MNG_SKIPCHUNK_PAST case 11 : { iRetcode = mng_process_display_past2 (pData); break; } #endif } } } 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 { pData->iSuspendpoint = 0; /* safely reset it here ! */ pPush = pData->pFirstpushchunk; iRetcode = process_raw_chunk (pData, pPush->pData, pPush->iLength); if (iRetcode) return iRetcode; #ifdef MNG_SUPPORT_DISPLAY /* refresh needed ? */ if ((!pData->bTimerset) && (!pData->bSuspended) && (pData->bNeedrefresh)) { iRetcode = mng_display_progressive_refresh (pData, 1); if (iRetcode) /* on error bail out */ return iRetcode; } #endif } return mng_release_pushchunk (pData); } /* ************************************************************************** */ mng_retcode mng_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, &pData->pReadbufnext, 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 #ifdef MNG_INCLUDE_JNG if (mng_get_uint32 (pData->pReadbuf) == JNG_SIG) pData->eSigtype = mng_it_jng; else #endif 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 { /* reset timer during mng_read() ? */ if ((pData->bReading) && (!pData->bDisplaying)) pData->bTimerset = MNG_FALSE; if (pData->pFirstpushchunk) /* chunks pushed ? */ iRetcode = process_pushedchunk (pData); /* process the pushed chunk */ else iRetcode = read_chunk (pData); /* read & 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->bSectionwait) && ((!pData->bTimerset) || ((pData->bReading) && (!pData->bDisplaying)))); #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 * */ /* ************************************************************************** */