diff options
Diffstat (limited to 'src/3rdparty/libmng/libmng_read.c')
| -rw-r--r-- | src/3rdparty/libmng/libmng_read.c | 1369 |
1 files changed, 1369 insertions, 0 deletions
diff --git a/src/3rdparty/libmng/libmng_read.c b/src/3rdparty/libmng/libmng_read.c new file mode 100644 index 0000000000..c922e19a5e --- /dev/null +++ b/src/3rdparty/libmng/libmng_read.c @@ -0,0 +1,1369 @@ +/* ************************************************************************** */ +/* * 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 * */ +/* ************************************************************************** */ + |