📄 libmng_jpeg.c
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/* ************************************************************************** */
/* * For conditions of distribution and use, * */
/* * see copyright notice in libmng.h * */
/* ************************************************************************** */
/* * * */
/* * project : libmng * */
/* * file : libmng_jpeg.c copyright (c) 2000-2004 G.Juyn * */
/* * version : 1.0.8 * */
/* * * */
/* * purpose : JPEG library interface (implementation) * */
/* * * */
/* * author : G.Juyn * */
/* * * */
/* * comment : implementation of the JPEG library interface * */
/* * * */
/* * changes : 0.5.1 - 05/08/2000 - G.Juyn * */
/* * - changed strict-ANSI stuff * */
/* * * */
/* * 0.5.2 - 05/22/2000 - G.Juyn * */
/* * - implemented all the JNG routines * */
/* * * */
/* * 0.5.3 - 06/17/2000 - G.Juyn * */
/* * - added tracing of JPEG calls * */
/* * 0.5.3 - 06/24/2000 - G.Juyn * */
/* * - fixed inclusion of IJG read/write code * */
/* * 0.5.3 - 06/29/2000 - G.Juyn * */
/* * - fixed some 64-bit warnings * */
/* * * */
/* * 0.9.2 - 08/05/2000 - G.Juyn * */
/* * - changed file-prefixes * */
/* * * */
/* * 0.9.3 - 10/16/2000 - G.Juyn * */
/* * - added support for JDAA * */
/* * * */
/* * 1.0.1 - 04/19/2001 - G.Juyn * */
/* * - added export of JPEG functions for DLL * */
/* * 1.0.1 - 04/22/2001 - G.Juyn * */
/* * - fixed memory-leaks (Thanks Gregg!) * */
/* * * */
/* * 1.0.4 - 06/22/2002 - G.Juyn * */
/* * - B526138 - returned IJGSRC6B calling convention to * */
/* * default for MSVC * */
/* * * */
/* * 1.0.5 - 24/02/2003 - G.Juyn * */
/* * - B683152 - libjpeg suspension not always honored correctly* */
/* * * */
/* * 1.0.6 - 03/04/2003 - G.Juyn * */
/* * - fixed some compiler-warnings * */
/* * * */
/* * 1.0.8 - 08/01/2004 - G.Juyn * */
/* * - added support for 3+byte pixelsize for JPEG's * */
/* * * */
/* ************************************************************************** */
#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_jpeg.h"
#if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI)
#pragma option -A /* force ANSI-C */
#endif
/* ************************************************************************** */
#if defined(MNG_INCLUDE_JNG) && defined(MNG_INCLUDE_DISPLAY_PROCS)
/* ************************************************************************** */
/* * * */
/* * Local IJG callback routines (source-manager, error-manager and such) * */
/* * * */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_IJG6B
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_init_source (j_decompress_ptr cinfo)
#else
void mng_init_source (j_decompress_ptr cinfo)
#endif
{
return; /* nothing needed */
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
boolean MNG_DECL mng_fill_input_buffer (j_decompress_ptr cinfo)
#else
boolean mng_fill_input_buffer (j_decompress_ptr cinfo)
#endif
{
return FALSE; /* force IJG routine to return to caller */
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
#else
void mng_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
#endif
{
if (num_bytes > 0) /* ignore fony calls */
{ /* address my generic structure */
mng_datap pData = (mng_datap)cinfo->client_data;
/* address source manager */
mngjpeg_sourcep pSrc = pData->pJPEGdinfo->src;
/* problem scenario ? */
if (pSrc->bytes_in_buffer < (size_t)num_bytes)
{ /* tell the boss we need to skip some data! */
pData->iJPEGtoskip = (mng_uint32)((size_t)num_bytes - pSrc->bytes_in_buffer);
pSrc->bytes_in_buffer = 0; /* let the JPEG lib suspend */
pSrc->next_input_byte = MNG_NULL;
}
else
{ /* simply advance in the buffer */
pSrc->bytes_in_buffer -= num_bytes;
pSrc->next_input_byte += num_bytes;
}
}
return;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_skip_input_data2 (j_decompress_ptr cinfo, long num_bytes)
#else
void mng_skip_input_data2 (j_decompress_ptr cinfo, long num_bytes)
#endif
{
if (num_bytes > 0) /* ignore fony calls */
{ /* address my generic structure */
mng_datap pData = (mng_datap)cinfo->client_data;
/* address source manager */
mngjpeg_sourcep pSrc = pData->pJPEGdinfo2->src;
/* problem scenario ? */
if (pSrc->bytes_in_buffer < (size_t)num_bytes)
{ /* tell the boss we need to skip some data! */
pData->iJPEGtoskip2 = (mng_uint32)((size_t)num_bytes - pSrc->bytes_in_buffer);
pSrc->bytes_in_buffer = 0; /* let the JPEG lib suspend */
pSrc->next_input_byte = MNG_NULL;
}
else
{ /* simply advance in the buffer */
pSrc->bytes_in_buffer -= num_bytes;
pSrc->next_input_byte += num_bytes;
}
}
return;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_term_source (j_decompress_ptr cinfo)
#else
void mng_term_source (j_decompress_ptr cinfo)
#endif
{
return; /* nothing needed */
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_USE_SETJMP
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_error_exit (j_common_ptr cinfo)
#else
void mng_error_exit (j_common_ptr cinfo)
#endif
{ /* address my generic structure */
mng_datap pData = (mng_datap)cinfo->client_data;
#ifdef MNG_ERROR_TELLTALE /* fill the message text ??? */
(*cinfo->err->output_message) (cinfo);
#endif
/* return to the point of no return... */
longjmp (pData->sErrorbuf, cinfo->err->msg_code);
}
#endif /* MNG_USE_SETJMP */
/* ************************************************************************** */
#ifdef MNG_USE_SETJMP
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_output_message (j_common_ptr cinfo)
#else
void mng_output_message (j_common_ptr cinfo)
#endif
{
return; /* just do nothing ! */
}
#endif /* MNG_USE_SETJMP */
/* ************************************************************************** */
#endif /* MNG_INCLUDE_IJG6B */
/* ************************************************************************** */
/* * * */
/* * Global JPEG routines * */
/* * * */
/* ************************************************************************** */
mng_retcode mngjpeg_initialize (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_INITIALIZE, MNG_LC_START)
#endif
/* allocate space for JPEG structures if necessary */
#ifdef MNG_INCLUDE_JNG_READ
if (pData->pJPEGderr == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGderr, sizeof (mngjpeg_error ))
if (pData->pJPEGdsrc == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGdsrc, sizeof (mngjpeg_source))
if (pData->pJPEGdinfo == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGdinfo, sizeof (mngjpeg_decomp))
/* enable reverse addressing */
pData->pJPEGdinfo->client_data = pData;
if (pData->pJPEGderr2 == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGderr2, sizeof (mngjpeg_error ))
if (pData->pJPEGdsrc2 == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGdsrc2, sizeof (mngjpeg_source))
if (pData->pJPEGdinfo2 == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGdinfo2, sizeof (mngjpeg_decomp))
/* enable reverse addressing */
pData->pJPEGdinfo2->client_data = pData;
#endif
#ifdef MNG_INCLUDE_JNG_WRITE
if (pData->pJPEGcerr == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGcerr, sizeof (mngjpeg_error ))
if (pData->pJPEGcinfo == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGcinfo, sizeof (mngjpeg_comp ))
/* enable reverse addressing */
pData->pJPEGcinfo->client_data = pData;
#endif
if (pData->pJPEGbuf == MNG_NULL) /* initialize temporary buffers */
{
pData->iJPEGbufmax = MNG_JPEG_MAXBUF;
MNG_ALLOC (pData, pData->pJPEGbuf, pData->iJPEGbufmax)
}
if (pData->pJPEGbuf2 == MNG_NULL)
{
pData->iJPEGbufmax2 = MNG_JPEG_MAXBUF;
MNG_ALLOC (pData, pData->pJPEGbuf2, pData->iJPEGbufmax2)
}
pData->pJPEGcurrent = pData->pJPEGbuf;
pData->iJPEGbufremain = 0;
pData->pJPEGrow = MNG_NULL;
pData->iJPEGrowlen = 0;
pData->iJPEGtoskip = 0;
pData->pJPEGcurrent2 = pData->pJPEGbuf2;
pData->iJPEGbufremain2 = 0;
pData->pJPEGrow2 = MNG_NULL;
pData->iJPEGrowlen2 = 0;
pData->iJPEGtoskip2 = 0;
/* not doing anything yet ! */
pData->bJPEGcompress = MNG_FALSE;
pData->bJPEGdecompress = MNG_FALSE;
pData->bJPEGhasheader = MNG_FALSE;
pData->bJPEGdecostarted = MNG_FALSE;
pData->bJPEGscanstarted = MNG_FALSE;
pData->bJPEGscanending = MNG_FALSE;
pData->bJPEGdecompress2 = MNG_FALSE;
pData->bJPEGhasheader2 = MNG_FALSE;
pData->bJPEGdecostarted2 = MNG_FALSE;
pData->bJPEGscanstarted2 = MNG_FALSE;
pData->iJPEGrow = 0; /* zero input/output lines */
pData->iJPEGalpharow = 0;
pData->iJPEGrgbrow = 0;
pData->iJPEGdisprow = 0;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_INITIALIZE, MNG_LC_END)
#endif
return MNG_NOERROR;
}
/* ************************************************************************** */
mng_retcode mngjpeg_cleanup (mng_datap pData)
{
#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
mng_retcode iRetcode;
#endif
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_CLEANUP, MNG_LC_START)
#endif
#ifdef MNG_INCLUDE_IJG6B
#ifdef MNG_USE_SETJMP
iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
if (iRetcode != 0) /* got here from longjmp ? */
MNG_ERRORJ (pData, iRetcode) /* then IJG-lib issued an error */
#endif
#ifdef MNG_INCLUDE_JNG_READ /* still decompressing something ? */
if (pData->bJPEGdecompress)
jpeg_destroy_decompress (pData->pJPEGdinfo);
if (pData->bJPEGdecompress2)
jpeg_destroy_decompress (pData->pJPEGdinfo2);
#endif
#ifdef MNG_INCLUDE_JNG_WRITE
if (pData->bJPEGcompress) /* still compressing something ? */
jpeg_destroy_compress (pData->pJPEGcinfo);
#endif
#endif /* MNG_INCLUDE_IJG6B */
/* cleanup temporary buffers */
MNG_FREE (pData, pData->pJPEGbuf2, pData->iJPEGbufmax2)
MNG_FREE (pData, pData->pJPEGbuf, pData->iJPEGbufmax)
/* cleanup space for JPEG structures */
#ifdef MNG_INCLUDE_JNG_WRITE
MNG_FREE (pData, pData->pJPEGcinfo, sizeof (mngjpeg_comp ))
MNG_FREE (pData, pData->pJPEGcerr, sizeof (mngjpeg_error ))
#endif
#ifdef MNG_INCLUDE_JNG_READ
MNG_FREE (pData, pData->pJPEGdinfo, sizeof (mngjpeg_decomp))
MNG_FREE (pData, pData->pJPEGdsrc, sizeof (mngjpeg_source))
MNG_FREE (pData, pData->pJPEGderr, sizeof (mngjpeg_error ))
MNG_FREE (pData, pData->pJPEGdinfo2, sizeof (mngjpeg_decomp))
MNG_FREE (pData, pData->pJPEGdsrc2, sizeof (mngjpeg_source))
MNG_FREE (pData, pData->pJPEGderr2, sizeof (mngjpeg_error ))
#endif
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