libmng_chunk_descr.c

奇趣公司比较新的qt/emd版本

/* ************************************************************************** */
/* *             For conditions of distribution and use,                    * */
/* *                see copyright notice in libmng.h                        * */
/* ************************************************************************** */
/* *                                                                        * */
/* * project   : libmng                                                     * */
/* * file      : libmng_chunk_descr.c      copyright (c) 2004 G.Juyn        * */
/* * version   : 1.0.9                                                      * */
/* *                                                                        * */
/* * purpose   : Chunk descriptor functions (implementation)                * */
/* *                                                                        * */
/* * author    : G.Juyn                                                     * */
/* *                                                                        * */
/* * comment   : implementation of the chunk- anf field-descriptor          * */
/* *             routines                                                   * */
/* *                                                                        * */
/* * changes   : 1.0.9 - 12/06/2004 - G.Juyn                                * */
/* *             - added conditional MNG_OPTIMIZE_CHUNKREADER               * */
/* *             1.0.9 - 12/11/2004 - G.Juyn                                * */
/* *             - made all constants 'static'                              * */
/* *             1.0.9 - 12/20/2004 - G.Juyn                                * */
/* *             - cleaned up macro-invocations (thanks to D. Airlie)       * */
/* *             1.0.9 - 01/17/2005 - G.Juyn                                * */
/* *             - fixed problem with global PLTE/tRNS                      * */
/* *                                                                        * */
/* ************************************************************************** */

#include <stddef.h>                    /* needed for offsetof() */

#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_chunks.h"
#include "libmng_chunk_descr.h"
#include "libmng_object_prc.h"
#include "libmng_chunk_prc.h"
#include "libmng_chunk_io.h"
#include "libmng_display.h"

#if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI)
#pragma option -A                      /* force ANSI-C */
#endif

/* ************************************************************************** */

#ifdef MNG_OPTIMIZE_CHUNKREADER
#if defined(MNG_INCLUDE_READ_PROCS) || defined(MNG_INCLUDE_WRITE_PROCS)

/* ************************************************************************** */
/* ************************************************************************** */
/* PNG chunks */

MNG_LOCAL mng_field_descriptor mng_fields_ihdr [] =
  {
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_NOHIGHBIT,
     1, 0, 4, 4,
     offsetof(mng_ihdr, iWidth), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_NOHIGHBIT,
     1, 0, 4, 4,
     offsetof(mng_ihdr, iHeight), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     1, 16, 1, 1,
     offsetof(mng_ihdr, iBitdepth), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 6, 1, 1,
     offsetof(mng_ihdr, iColortype), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 1, 1,
     offsetof(mng_ihdr, iCompression), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 1, 1,
     offsetof(mng_ihdr, iFilter), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 1, 1, 1,
     offsetof(mng_ihdr, iInterlace), MNG_NULL, MNG_NULL}
  };

/* ************************************************************************** */

MNG_LOCAL mng_field_descriptor mng_fields_plte [] =
  {
    {mng_debunk_plte,
     MNG_NULL,
     0, 0, 0, 0,
     MNG_NULL, MNG_NULL, MNG_NULL}
  };

/* ************************************************************************** */

MNG_LOCAL mng_field_descriptor mng_fields_idat [] =
  {
    {MNG_NULL,
     MNG_NULL,
     0, 0, 0, 0,
     offsetof(mng_idat, pData), MNG_NULL, offsetof(mng_idat, iDatasize)}
  };

/* ************************************************************************** */

MNG_LOCAL mng_field_descriptor mng_fields_trns [] =
  {
    {mng_debunk_trns,
     MNG_NULL,
     0, 0, 0, 0,
     MNG_NULL, MNG_NULL, MNG_NULL}
  };

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_gAMA
MNG_LOCAL mng_field_descriptor mng_fields_gama [] =
  {
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_gama, iGamma), MNG_NULL, MNG_NULL}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_cHRM
MNG_LOCAL mng_field_descriptor mng_fields_chrm [] =
  {
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_chrm, iWhitepointx), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_chrm, iWhitepointy), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_chrm, iRedx), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_chrm, iRedy), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_chrm, iGreeny), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_chrm, iGreeny), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_chrm, iBluex), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_chrm, iBluey), MNG_NULL, MNG_NULL}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_sRGB
MNG_LOCAL mng_field_descriptor mng_fields_srgb [] =
  {
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 4, 1, 1,
     offsetof(mng_srgb, iRenderingintent), MNG_NULL, MNG_NULL}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_iCCP
MNG_LOCAL mng_field_descriptor mng_fields_iccp [] =
  {
    {MNG_NULL,
     MNG_FIELD_TERMINATOR,
     0, 0, 1, 79,
     offsetof(mng_iccp, zName), MNG_NULL, offsetof(mng_iccp, iNamesize)},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 1, 1,
     offsetof(mng_iccp, iCompression), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_DEFLATED,
     0, 0, 0, 0,
     offsetof(mng_iccp, pProfile), MNG_NULL, offsetof(mng_iccp, iProfilesize)}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_tEXt
MNG_LOCAL mng_field_descriptor mng_fields_text [] =
  {
    {MNG_NULL,
     MNG_FIELD_TERMINATOR,
     0, 0, 1, 79,
     offsetof(mng_text, zKeyword), MNG_NULL, offsetof(mng_text, iKeywordsize)},
    {MNG_NULL,
     MNG_NULL,
     0, 0, 0, 0,
     offsetof(mng_text, zText), MNG_NULL, offsetof(mng_text, iTextsize)}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_zTXt
MNG_LOCAL mng_field_descriptor mng_fields_ztxt [] =
  {
    {MNG_NULL,
     MNG_FIELD_TERMINATOR,
     0, 0, 1, 79,
     offsetof(mng_ztxt, zKeyword), MNG_NULL, offsetof(mng_ztxt, iKeywordsize)},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 1, 1,
     offsetof(mng_ztxt, iCompression), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_DEFLATED,
     0, 0, 0, 0,
     offsetof(mng_ztxt, zText), MNG_NULL, offsetof(mng_ztxt, iTextsize)}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_iTXt
MNG_LOCAL mng_field_descriptor mng_fields_itxt [] =
  {
    {MNG_NULL,
     MNG_FIELD_TERMINATOR,
     0, 0, 1, 79,
     offsetof(mng_itxt, zKeyword), MNG_NULL, offsetof(mng_itxt, iKeywordsize)},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 1, 1, 1,
     offsetof(mng_itxt, iCompressionflag), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 1, 1,
     offsetof(mng_itxt, iCompressionmethod), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_TERMINATOR,
     0, 0, 0, 0,
     offsetof(mng_itxt, zLanguage), MNG_NULL, offsetof(mng_itxt, iLanguagesize)},
    {MNG_NULL,
     MNG_FIELD_TERMINATOR,
     0, 0, 0, 0,
     offsetof(mng_itxt, zTranslation), MNG_NULL, offsetof(mng_itxt, iTranslationsize)},
    {mng_deflate_itxt,
     MNG_NULL,
     0, 0, 0, 0,
     MNG_NULL, MNG_NULL, MNG_NULL}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_bKGD
MNG_LOCAL mng_field_descriptor mng_fields_bkgd [] =
  {
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_PUTIMGTYPE,
     0, 0, 0, 0,
     offsetof(mng_bkgd, iType), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_IFIMGTYPE3,
     0, 0xFF, 1, 1,
     offsetof(mng_bkgd, iIndex), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_IFIMGTYPE0 | MNG_FIELD_IFIMGTYPE4,
     0, 0xFFFF, 2, 2,
     offsetof(mng_bkgd, iGray), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_IFIMGTYPE2 | MNG_FIELD_IFIMGTYPE6,
     0, 0xFFFF, 2, 2,
     offsetof(mng_bkgd, iRed), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_IFIMGTYPE2 | MNG_FIELD_IFIMGTYPE6,
     0, 0xFFFF, 2, 2,
     offsetof(mng_bkgd, iGreen), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_IFIMGTYPE2 | MNG_FIELD_IFIMGTYPE6,
     0, 0xFFFF, 2, 2,
     offsetof(mng_bkgd, iBlue), MNG_NULL, MNG_NULL}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_pHYs
MNG_LOCAL mng_field_descriptor mng_fields_phys [] =
  {
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_phys, iSizex), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 0, 4, 4,
     offsetof(mng_phys, iSizey), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT,
     0, 1, 1, 1,
     offsetof(mng_phys, iUnit), MNG_NULL, MNG_NULL}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_sBIT
MNG_LOCAL mng_field_descriptor mng_fields_sbit [] =
  {
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_PUTIMGTYPE,
     0, 0, 0, 0,
     offsetof(mng_sbit, iType), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_IFIMGTYPES,
     0, 0xFF, 1, 1,
     offsetof(mng_sbit, aBits[0]), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_IFIMGTYPE2 | MNG_FIELD_IFIMGTYPE3 | MNG_FIELD_IFIMGTYPE4 | MNG_FIELD_IFIMGTYPE6,
     0, 0xFF, 1, 1,
     offsetof(mng_sbit, aBits[1]), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_IFIMGTYPE2 | MNG_FIELD_IFIMGTYPE3 | MNG_FIELD_IFIMGTYPE6,
     0, 0xFF, 1, 1,
     offsetof(mng_sbit, aBits[2]), MNG_NULL, MNG_NULL},
    {MNG_NULL,
     MNG_FIELD_INT | MNG_FIELD_IFIMGTYPE6,
     0, 0xFF, 1, 1,
     offsetof(mng_sbit, aBits[3]), MNG_NULL, MNG_NULL}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_sPLT
MNG_LOCAL mng_field_descriptor mng_fields_splt [] =
  {
    {MNG_NULL,
     MNG_NULL,
     0, 0, 1, 79,
     offsetof(mng_splt, zName), MNG_NULL, offsetof(mng_splt, iNamesize)},
    {MNG_NULL,
     MNG_FIELD_INT,
     8, 16, 1, 1,
     offsetof(mng_splt, iSampledepth), MNG_NULL, MNG_NULL},
    {mng_splt_entries,
     MNG_NULL,
     0, 0, 0, 0,
     MNG_NULL, MNG_NULL, MNG_NULL}
  };
#endif

/* ************************************************************************** */

#ifndef MNG_SKIPCHUNK_hIST
MNG_LOCAL mng_field_descriptor mng_fields_hist [] =
  {