diff options
Diffstat (limited to 'tqtinterface/qt4/src/3rdparty/libmng/libmng_read.c')
| -rw-r--r-- | tqtinterface/qt4/src/3rdparty/libmng/libmng_read.c | 696 |
1 files changed, 696 insertions, 0 deletions
diff --git a/tqtinterface/qt4/src/3rdparty/libmng/libmng_read.c b/tqtinterface/qt4/src/3rdparty/libmng/libmng_read.c new file mode 100644 index 0000000..e907ad7 --- /dev/null +++ b/tqtinterface/qt4/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 required ? */ + { + 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 required ? */ + 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 required ? */ + 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 tqlayout 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 * */ +/* ************************************************************************** */ + |