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/* ************************************************************************** */
/* * For conditions of distribution and use, * */
/* * see copyright notice in libmng.h * */
/* ************************************************************************** */
/* * * */
/* * project : libmng * */
/* * file : libmng_zlib.c copyright (c) 2000 G.Juyn * */
/* * version : 1.0.0 * */
/* * * */
/* * purpose : ZLIB library interface (implementation) * */
/* * * */
/* * author : G.Juyn * */
/* * web : http://www.3-t.com * */
/* * email : mailto:info@3-t.com * */
/* * * */
/* * comment : implementation of the ZLIB library interface * */
/* * * */
/* * changes : 0.5.1 - 05/08/2000 - G.Juyn * */
/* * - changed strict-ANSI stuff * */
/* * 0.5.1 - 05/11/2000 - G.Juyn * */
/* * - filled the deflatedata routine * */
/* * 0.5.1 - 05/12/2000 - G.Juyn * */
/* * - changed trace to macro for callback error-reporting * */
/* * * */
/* * 0.5.2 - 05/20/2000 - G.Juyn * */
/* * - fixed for JNG alpha handling * */
/* * 0.5.2 - 05/24/2000 - G.Juyn * */
/* * - moved init of default zlib parms from here to * */
/* * "mng_hlapi.c" * */
/* * * */
/* * 0.5.3 - 06/16/2000 - G.Juyn * */
/* * - changed progressive-display processing * */
/* * * */
/* * 0.9.2 - 08/05/2000 - G.Juyn * */
/* * - changed file-prefixes * */
/* * * */
/* * 0.9.3 - 08/08/2000 - G.Juyn * */
/* * - fixed compiler-warnings from Mozilla * */
/* * 0.9.3 - 09/07/2000 - G.Juyn * */
/* * - added support for new filter_types * */
/* * * */
/* ************************************************************************** */
#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_pixels.h"
#include "libmng_filter.h"
#include "libmng_zlib.h"
#if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI)
#pragma option -A /* force ANSI-C */
#endif
/* ************************************************************************** */
#ifdef MNG_INCLUDE_ZLIB
/* ************************************************************************** */
voidpf mngzlib_alloc (voidpf pData,
uInt iCount,
uInt iSize)
{
voidpf pPtr; /* temporary space */
#ifdef MNG_INTERNAL_MEMMNGMT
pPtr = calloc (iCount, iSize); /* local allocation */
#else
if (((mng_datap)pData)->fMemalloc) /* callback function set ? */
pPtr = ((mng_datap)pData)->fMemalloc (iCount * iSize);
else
pPtr = Z_NULL; /* can't allocate! */
#endif
return pPtr; /* return the result */
}
/* ************************************************************************** */
void mngzlib_free (voidpf pData,
voidpf pAddress)
{
#ifdef MNG_INTERNAL_MEMMNGMT
free (pAddress); /* free locally */
#else
if (((mng_datap)pData)->fMemfree) /* callback set? */
((mng_datap)pData)->fMemfree (pAddress, 1);
#endif
}
/* ************************************************************************** */
mng_retcode mngzlib_initialize (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INITIALIZE, MNG_LC_START)
#endif
#ifdef MNG_INTERNAL_MEMMNGMT
pData->sZlib.zalloc = Z_NULL; /* let zlib figure out memory management */
pData->sZlib.zfree = Z_NULL;
pData->sZlib.opaque = Z_NULL;
#else /* use user-provided callbacks */
pData->sZlib.zalloc = mngzlib_alloc;
pData->sZlib.zfree = mngzlib_free;
pData->sZlib.opaque = (voidpf)pData;
#endif
pData->bInflating = MNG_FALSE; /* not performing any action yet */
pData->bDeflating = MNG_FALSE;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INITIALIZE, MNG_LC_END)
#endif
return MNG_NOERROR; /* done */
}
/* ************************************************************************** */
mng_retcode mngzlib_cleanup (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_CLEANUP, MNG_LC_START)
#endif
if (pData->bInflating) /* force zlib cleanup */
mngzlib_inflatefree (pData);
if (pData->bDeflating)
mngzlib_deflatefree (pData);
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_CLEANUP, MNG_LC_END)
#endif
return MNG_NOERROR; /* done */
}
/* ************************************************************************** */
mng_retcode mngzlib_inflateinit (mng_datap pData)
{
int iZrslt;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEINIT, MNG_LC_START)
#endif
/* initialize zlib structures and such */
iZrslt = inflateInit (&pData->sZlib);
if (iZrslt != Z_OK) /* on error bail out */
MNG_ERRORZ (pData, (mng_uint32)iZrslt)
pData->bInflating = MNG_TRUE; /* really inflating something now */
pData->sZlib.next_out = 0; /* force JIT initialization */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEINIT, MNG_LC_END)
#endif
return MNG_NOERROR; /* done */
}
/* ************************************************************************** */
#ifdef MNG_SUPPORT_DISPLAY
mng_retcode mngzlib_inflaterows (mng_datap pData,
mng_uint32 iInlen,
mng_uint8p pIndata)
{
int iZrslt;
mng_retcode iRslt;
mng_ptr pSwap;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEROWS, MNG_LC_START)
#endif
pData->sZlib.next_in = pIndata; /* let zlib know where to get stuff */
pData->sZlib.avail_in = (uInt)iInlen;
if (pData->sZlib.next_out == 0) /* initialize output variables ? */
{ /* let zlib know where to store stuff */
pData->sZlib.next_out = pData->pWorkrow;
pData->sZlib.avail_out = (uInt)(pData->iRowsize + pData->iPixelofs);
}
do
{ /* now inflate a row */
iZrslt = inflate (&pData->sZlib, Z_SYNC_FLUSH);
/* produced a full row ? */
if (((iZrslt == Z_OK) || (iZrslt == Z_STREAM_END)) &&
(pData->sZlib.avail_out == 0))
{ /* shouldn't we be at the end ? */
if (pData->iRow >= (mng_int32)pData->iDataheight)
/* MNG_ERROR (pData, MNG_TOOMUCHIDAT) */ ; /* TODO: check this!!! */
else
{ /* has leveling info ? */
/* if (pData->iFilterofs)
iRslt = init_rowdiffering (pData);
else
iRslt = MNG_NOERROR; */
/* filter the row if necessary */
/* if ((!iRslt) && (pData->iFilterofs < pData->iPixelofs ) &&
(*(pData->pWorkrow + pData->iFilterofs)) ) */
if (*(pData->pWorkrow + pData->iFilterofs))
iRslt = filter_a_row (pData);
else
iRslt = MNG_NOERROR;
/* additonal leveling/differing ? */
if ((!iRslt) && (pData->fDifferrow))
{
iRslt = ((mng_differrow)pData->fDifferrow) (pData);
pSwap = pData->pWorkrow;
pData->pWorkrow = pData->pPrevrow;
pData->pPrevrow = pSwap; /* make sure we're processing the right data */
}
if (!iRslt)
{
#ifdef MNG_INCLUDE_JNG
if (pData->bHasJHDR) /* is JNG alpha-channel ? */
{ /* just store in object ? */
if ((!iRslt) && (pData->fStorerow))
iRslt = ((mng_storerow)pData->fStorerow) (pData);
}
else
#endif /* MNG_INCLUDE_JNG */
{ /* process this row */
if ((!iRslt) && (pData->fProcessrow))
iRslt = ((mng_processrow)pData->fProcessrow) (pData);
/* store in object ? */
if ((!iRslt) && (pData->fStorerow))
iRslt = ((mng_storerow)pData->fStorerow) (pData);
/* color correction ? */
if ((!iRslt) && (pData->fCorrectrow))
iRslt = ((mng_correctrow)pData->fCorrectrow) (pData);
/* slap onto canvas ? */
if ((!iRslt) && (pData->fDisplayrow))
{
iRslt = ((mng_displayrow)pData->fDisplayrow) (pData);
if (!iRslt) /* check progressive display refresh */
iRslt = display_progressive_check (pData);
}
}
}
if (iRslt) /* on error bail out */
MNG_ERROR (pData, iRslt);
if (!pData->fDifferrow) /* swap row-pointers */
{
pSwap = pData->pWorkrow;
pData->pWorkrow = pData->pPrevrow;
pData->pPrevrow = pSwap; /* so prev points to the processed row! */
}
iRslt = next_row (pData); /* adjust variables for next row */
if (iRslt) /* on error bail out */
MNG_ERROR (pData, iRslt);
}
/* let zlib know where to store next output */
pData->sZlib.next_out = pData->pWorkrow;
pData->sZlib.avail_out = (uInt)(pData->iRowsize + pData->iPixelofs);
}
} /* until some error or EOI */
while ((iZrslt == Z_OK) && (pData->sZlib.avail_in > 0));
/* on error bail out */
if ((iZrslt != Z_OK) && (iZrslt != Z_STREAM_END))
MNG_ERRORZ (pData, (mng_uint32)iZrslt)
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEROWS, MNG_LC_END)
#endif
return MNG_NOERROR;
}
#endif /* MNG_SUPPORT_DISPLAY */
/* ************************************************************************** */
mng_retcode mngzlib_inflatedata (mng_datap pData,
mng_uint32 iInlen,
mng_uint8p pIndata)
{
int iZrslt;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEDATA, MNG_LC_START)
#endif
/* let zlib know where to get stuff */
pData->sZlib.next_in = pIndata;
pData->sZlib.avail_in = (uInt)iInlen;
/* now inflate the data in one go! */
iZrslt = inflate (&pData->sZlib, Z_FINISH);
/* not enough room in output-buffer ? */
if ((iZrslt == Z_BUF_ERROR) || (pData->sZlib.avail_in > 0))
return MNG_BUFOVERFLOW;
/* on error bail out */
if ((iZrslt != Z_OK) && (iZrslt != Z_STREAM_END))
MNG_ERRORZ (pData, (mng_uint32)iZrslt)
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEDATA, MNG_LC_END)
#endif
return MNG_NOERROR;
}
/* ************************************************************************** */
mng_retcode mngzlib_inflatefree (mng_datap pData)
{
int iZrslt;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEFREE, MNG_LC_START)
#endif
pData->bInflating = MNG_FALSE; /* stopped it */
iZrslt = inflateEnd (&pData->sZlib); /* let zlib cleanup it's own stuff */
if (iZrslt != Z_OK) /* on error bail out */
MNG_ERRORZ (pData, (mng_uint32)iZrslt)
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEFREE, MNG_LC_END)
#endif
return MNG_NOERROR; /* done */
}
/* ************************************************************************** */
mng_retcode mngzlib_deflateinit (mng_datap pData)
{
int iZrslt;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEINIT, MNG_LC_START)
#endif
/* initialize zlib structures and such */
iZrslt = deflateInit2 (&pData->sZlib, pData->iZlevel, pData->iZmethod,
pData->iZwindowbits, pData->iZmemlevel,
pData->iZstrategy);
if (iZrslt != Z_OK) /* on error bail out */
MNG_ERRORZ (pData, (mng_uint32)iZrslt)
pData->bDeflating = MNG_TRUE; /* really deflating something now */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEINIT, MNG_LC_END)
#endif
return MNG_NOERROR; /* done */
}
/* ************************************************************************** */
mng_retcode mngzlib_deflaterows (mng_datap pData,
mng_uint32 iInlen,
mng_uint8p pIndata)
{
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEROWS, MNG_LC_START)
#endif
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEROWS, MNG_LC_END)
#endif
return MNG_NOERROR;
}
/* ************************************************************************** */
mng_retcode mngzlib_deflatedata (mng_datap pData,
mng_uint32 iInlen,
mng_uint8p pIndata)
{
int iZrslt;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEDATA, MNG_LC_START)
#endif
pData->sZlib.next_in = pIndata; /* let zlib know where to get stuff */
pData->sZlib.avail_in = (uInt)iInlen;
/* now deflate the data in one go! */
iZrslt = deflate (&pData->sZlib, Z_FINISH);
/* not enough room in output-buffer ? */
if ((iZrslt == Z_BUF_ERROR) || (pData->sZlib.avail_in > 0))
return MNG_BUFOVERFLOW;
/* on error bail out */
if ((iZrslt != Z_OK) && (iZrslt != Z_STREAM_END))
MNG_ERRORZ (pData, (mng_uint32)iZrslt)
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEDATA, MNG_LC_END)
#endif
return MNG_NOERROR;
}
/* ************************************************************************** */
mng_retcode mngzlib_deflatefree (mng_datap pData)
{
int iZrslt;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEFREE, MNG_LC_START)
#endif
iZrslt = deflateEnd (&pData->sZlib); /* let zlib cleanup it's own stuff */
if (iZrslt != Z_OK) /* on error bail out */
MNG_ERRORZ (pData, (mng_uint32)iZrslt)
pData->bDeflating = MNG_FALSE; /* stopped it */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_DEFLATEFREE, MNG_LC_END)
#endif
return MNG_NOERROR; /* done */
}
/* ************************************************************************** */
#endif /* MNG_INCLUDE_ZLIB */
/* ************************************************************************** */
/* * end of file * */
/* ************************************************************************** */
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