diff options
Diffstat (limited to 'src/3rdparty/libmng/libmng_read.c')
-rw-r--r-- | src/3rdparty/libmng/libmng_read.c | 1369 |
1 files changed, 0 insertions, 1369 deletions
diff --git a/src/3rdparty/libmng/libmng_read.c b/src/3rdparty/libmng/libmng_read.c deleted file mode 100644 index c922e19..0000000 --- a/src/3rdparty/libmng/libmng_read.c +++ /dev/null @@ -1,1369 +0,0 @@ -/* ************************************************************************** */ -/* * 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 * */ -/* ************************************************************************** */ - 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