| /* ************************************************************************** */ |
| /* * 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 * */ |
| /* ************************************************************************** */ |
| |
