#include "config.h"
/* ************************************************************************** */
/* * 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 * */
/* ************************************************************************** */